US20040089500A1 - Muffler with spark arrestor - Google Patents
Muffler with spark arrestor Download PDFInfo
- Publication number
- US20040089500A1 US20040089500A1 US10/698,864 US69886403A US2004089500A1 US 20040089500 A1 US20040089500 A1 US 20040089500A1 US 69886403 A US69886403 A US 69886403A US 2004089500 A1 US2004089500 A1 US 2004089500A1
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- United States
- Prior art keywords
- spark
- recited
- muffler
- canister
- barrier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
- F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/06—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for extinguishing sparks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2310/00—Selection of sound absorbing or insulating material
- F01N2310/02—Mineral wool, e.g. glass wool, rock wool, asbestos or the like
Definitions
- the present invention relates to mufflers and components thereof. More specifically, the present inventions relates to mufflers and components thereof for motorcycles, ATVs and other personal on- and off-road vehicles.
- mufflers to reduce noise. More recently, off-road vehicles have been required to incorporate a spark arrestor in the muffler to prevent a spark or carbon particle from exiting with the exhaust and potentially creating a fire.
- Conventional mufflers comprise a canister housing a noise reducing packing material. A separate and discrete outlet cap is bolted on the tail end of the canister. A screen type spark arrestor is typically disposed between the end cap and the canister.
- conventional mufflers generally sever their intended function, they have a number of shortcomings. For example, conventional mufflers are relatively expensive in that a uniquely configured muffler must be designed for each style of motorcraft. Furthermore, because spark arrestors are required to have a defined area size, most mufflers are larger and heavier than necessary to accommodate the spark arrestor. With the increasing demand for high performance motorcraft, it is desirable to provide mufflers that are relatively inexpensive and which provide and/or enable the user to optimize performance characteristics. Many conventional mufflers also have the downside in that their design results in relatively frequent clogging of the spark arrestor with particles from the exhaust. Such clogging has a detrimental affect on engine performance.
- FIG. 1 is a perspective view of a muffler
- FIG. 2 is a top plan view of the muffler shown in FIG. 1;
- FIG. 3 is a disassembled view of the muffler shown in FIG. 1;
- FIG. 4 is a cross sectional side view of the canister shown in FIG. 3;
- FIG. 5 is a cross sectional side view of the canister shown in FIG. 4 taken along lines 5 - 5 ;
- FIG. 6 is a cross sectional side view of the muffler shown in FIG. 2 taken along lines 6 - 6 ;
- FIG. 7 is an elevated right end view of the muffler shown in FIG. 1;
- FIG. 8 is a perspective view of a spark arrestor of the muffler shown in FIG. 1;
- FIGS. 9 and 10 are alternative embodiments of folds for the spark barrier of the spark arrestor shown in FIG. 8;
- FIG. 11 is a side view of an alternative embodiment of a spark barrier having a conical configuration
- FIG. 12 is a side view of an alternative embodiment of a spark barrier having a domed shaped configuration
- FIG. 13 is a side view of an alternative embodiment of a spark barrier having a cylindrical configuration
- FIG. 14 is an elongated cross sectional side view of an alternative embodiment of a spark barrier for the spark arrestor shown in FIG. 8;
- FIG. 15 is another elongated cross sectional side view of an alternative embodiment for a spark barrier of the spark arrestor shown in FIG. 8;
- FIG. 16 is a perspective view of an alternative embodiment of a spark arrestor
- FIG. 17 is a top plan view of a blank used to make the spark barrier of the spark arrestor shown in FIG. 16;
- FIG. 18 is a perspective view of the spark barrier shown in FIG. 16.
- FIG. 19 is a perspective view of a nozzle used to replace the spark arrestor shown in FIG. 8.
- FIGS. 1 and 2 Depicted in FIGS. 1 and 2 is one embodiment of an inventive muffler 10 incorporating features of the present invention.
- Muffler 10 has an inlet end for receiving exhaust from an engine and an opposing outlet end 14 for discharging the exhaust to the surround environment.
- Muffler 10 can be used in association with motorcycles, ATVs, or other personal motorcraft.
- muffler 10 comprises a canister 20 which includes a tubular body 22 having an exhaust cap 24 integrally formed thereon.
- Tubular body 22 has an exterior surface 26 and an interior surface 28 each extending between a first end 30 and an opposing second end 32 .
- interior surface 28 bounds an elongated chamber 29 having a central longitudinal axis 31 extending therethrough. Chamber 29 communicates with the exterior through an opening 33 at first end 30 .
- a plurality of spaced apart holes 35 extend through tubular body 22 adjacent to opening 33 .
- tubular body 22 has a substantially uniform transverse cross section along the length thereof.
- tubular body 22 further comprises a first side wall 34 and an opposing second side wall 36 each extending between a top wall 38 and an opposing bottom wall 40 .
- Each of side walls 34 and 36 has an outwardly bowed inside surface 42 and outside surface 44 .
- Each of top wall 38 and bottom wall 40 have a substantially flat inside surface 46 and outside surface 48 .
- Each of top wall 38 and bottom wall 40 have a thickness T 1 typically in a range between about 0.06 inches to about 0.09 inches while each of side walls 34 and 36 have a thickness T 2 typically in a range between about 0.03 inches to about 0.07 inches. Other dimensions can also be used.
- thickness T 1 is greater than thickness T 2
- thickness T 2 is about 0.05 inches.
- the unique configuration and thicknesses of the walls of body 22 produce a number of unique benefits.
- depicted in FIGS. 1 and 2 is a mounting bracket 50 secured to top wall 38 .
- Mounting bracket 50 comprises a base plate 52 having a substantially flat bottom surface 53 .
- a brace 54 is integrally formed with and upstands from base plate 52 .
- Brace 54 has an opening 56 extending therethrough to facilitate attachment to the vehicle. It is appreciated that opening 56 can be replaced with any attachment mechanism for securing mounting bracket 50 to the vehicle.
- base plate 52 can be easily mounted at any select lateral, longitudinal, or angled location on outside surface 48 of top wall 38 so that muffler 10 can fit a variety of different motor vehicles. That is, many prior art mufflers have a circular or oval exterior transverse cross section. By changing the lateral position or angled orientation of the mounting bracket on such mufflers, the height and projected orientation of the mounting bracket also changes. Furthermore, the base plate of the mounting bracket is typically welded to the canister. To facilitate welding, the base plate must fit in a close tolerance with the surface of the canister. On oval or circular mufflers, the fit between the canister and the mounting bracket changes as the mounting bracket is moved on the canister.
- canister 20 and mounting bracket 50 it is necessary to fabricate a number of different sized and shaped canisters and/or mounting brackets so as to enable the mufflers to fit a variety of different styles of motor vehicles.
- a single configuration of canister 20 and mounting bracket 50 can be used to fit a variety of different motor vehicles.
- a standardized billet machined mounting bracket can be positioned and fixed exactly where it is needed on canister 20 without the use of alignment spacers.
- Mounting bracket 50 is secured to canister 20 using welding, rivets, or other conventional techniques.
- any number of mounting brackets 50 can be mounted on top wall 38 and/or bottom wall 40 at any desired location or orientation.
- Top wall 38 has the thickness T 1 , as discussed above, which is sufficient to enable welding or other desired securing techniques and to subsequently withstand the forces applied during use of the vehicle.
- these walls can have a reduced thickness.
- each of the walls 34 - 40 can have common or different thicknesses.
- top wall 38 can have a different thickness than bottom wall 40 .
- all of the walls can have the same thickness.
- top wall 38 and bottom wall 40 need not be flat.
- tubular body 22 can have a transverse cross sectional configuration that is circular, oval, square, or any other polygonal or irregular configuration. It is also appreciated that the configuration of the interior surface of body 22 can be the same as or different from the exterior surface of body 22 .
- exhaust cap 24 is integrally formed with tubular body 22 .
- exhaust cap 24 comprises an annular side wall 55 having an exterior surface 56 that radially inwardly tapers, at an angle relative to tubular body 22 , from a first end 58 to an opposing second end 60 .
- exhaust cap 24 is shown having a greater thickness than the wall of body 22 . This enables exhaust cap 24 to be machined or otherwise mechanically processed to obtain the desired configuration.
- first end 58 of exhaust cap 24 has an inside face 64 that is integrally formed with second end 32 to tubular body 22 and radially inwardly projects therefrom.
- Second end 60 of exhaust cap 24 terminates at an exposed end face 62 .
- End face 62 is disposed in a plane 65 that forms an inside angle ⁇ 1 with central longitudinal axis 31 that is typically less than about 80°. In one embodiment the angle ⁇ 1 is in a range between about 65° to about 80°. Other angles can also be used.
- a pocket 66 Recessed into end face 62 of exhaust cap 24 is a pocket 66 that terminates at an annular shoulder 67 . Extending between pocket 66 and inside face 64 of exhaust cap 24 is a channel 68 communicating with chamber 29 . Channel 68 is curved or angled relative central longitudinal axis 31 of tubular body 20 . A tubular stem 70 projects from inside face 64 of exhaust cap 24 so as to encircle a portion of channel 68 and extend into chamber 29 . As will be discussed below in greater detail, a groove 72 extends from pocket 66 into the upper side of second end 60 of end cap 24 . Furthermore, a hole 74 extends through second end 60 of end cap 24 and into pocket 66 at a location opposite of groove 72 .
- canister 20 is formed by impact extrusion. This process enables the integral formation of body 22 and exhaust cap 24 where exhaust cap 24 has an increased thickness.
- canister 20 can be formed by various conventional molding processes. It is also appreciated that canister 20 can be formed with body 22 and exhaust cap 24 being separate and discrete members. In this embodiment, body 22 and exhaust cap 24 are secured together such as by welding, screwing, bolting, or any other conventional technique.
- Canister 20 is typically made of metal such as aluminum. Alternatively, canister 20 can be made of other metals or from non-metals such as fiber reinforced composite materials.
- canister 20 is formed so as to minimize weight, materials, and manufacturing costs.
- muffler 10 further comprises a perf tube 80 having an exterior surface 82 and an interior surface 84 each extending between a first end 86 and an opposing second end 88 .
- Interior surface 84 bounds a passageway 90 extending therethrough. Extending between exterior surface 82 and an interior surface 84 along the length of perf tube 80 are a plurality of perforations 92 (FIG. 6).
- Exhaust pipe 94 couples with the engine to deliver the exhaust from the engine to muffler 10 .
- Mounted at or adjacent to the coupling between perf tube 80 and exhaust pipe 94 is an inlet cap 100 .
- inlet cap 100 comprises an annular base 102 that is welded or otherwise secured to perf tube 80 and/or exhaust pipe 94 and radially outwardly projects therefrom.
- perf tube 80 is received within canister 20 through opening 33 .
- Second end 88 of perf tube 80 is advanced with chamber 29 so as to engage inside of stem 70 of exhaust cap 24 .
- sleeve 104 of inlet cap 100 is received within opening 33 of canister 20 so that inlet cap 100 covers opening 33 .
- Fasteners 110 such as bolts or rivets, are passed into holes 35 of canister 20 and holes 106 of inlet cap 100 so as to secure inlet cap 100 to canister 20 .
- An annular seal 102 is disposed therebetween so as to form an air tight seal.
- heat shield 114 encircling perf tube 80 and extending along the length thereof is a heat shield 114 .
- heat shield 114 comprises a tubular member formed of mesh screen. Heat shield 114 allows the exhaust to pass therethrough but prevents the noise absorbing packing, discussed below, from traveling therethrough and into passageway 90 of perf tube 80 .
- packing 116 disposed between heat shield 114 and canister 20 and extending between exhaust cap 24 and inlet cap 100 is noise absorbing packing 116 .
- packing 116 is illustrated in FIG. 3 as an integral member, packing 116 typically comprises loosely packed fibers such as fiberglass, E-glass, or other conventional materials known to those skilled in the art.
- the engine exhaust enters passageway 90 of perf tube 80 from exhaust pipe 94 .
- portions of the exhaust and accompanying sound waves disperse out through perforations 92 of perf tube 80 and through heat shield 114 so as to travel through noise absorbing packing 116 .
- noise absorbing packing 116 dampens the sound waves before the exhaust exits out through channel 68 of exhaust cap 24 .
- spark arrestor 120 comprises a curved or bent tubular neck 122 having an interior surface 124 and an exterior surface 126 extending between a first end 128 and an opposing second end 130 .
- Interior surface 124 bounds a passageway 132 longitudinally extending therethrough.
- An annular flange 134 radially outwardly projects from first end 128 of neck 122 .
- An annular flange 160 also radially outwardly projects from neck 122 toward second end 130 .
- Spark barrier 136 Outwardly projecting from flange 134 so as to cover the opening to passageway 132 at first end 128 of neck 122 is a spark barrier 136 .
- Spark barrier 136 has a substantially frustoconical configuration which includes an enlarged mounting end 192 that constricts to an opposing free end 194 .
- a plurality of exposed folds 137 longitudinally extend between mounting end 192 and free end 194 .
- Mounting end 192 is secured to flange 134 such as by welding or other fastening techniques.
- Spark barrier 136 is comprised of a sheet of mesh or porous material typically having an open area in a range between about 25% to about 50%.
- the mesh material is typically comprised of wire but can also be comprised of other non-flammable materials.
- spark barrier 136 can be comprised of a perforated or otherwise porous sheet of material such as a perforated metal sheet. In either event, the materials allows the free flow of exhaust gas therethrough but acts as a filter to prevent the passage of sparks or particles therethrough.
- Spark arrestor 120 is removably held in place by a retention ring 164 having a central port 165 extending therethrough.
- Retention ring 164 has a top end with a tab 166 projecting therefrom and an opposing bottom end with a threaded hole 168 formed thereat.
- spark barrier 136 is passed through passageway 68 of exhaust cap 24 and into passageway 90 of perf tube 80 until flange 160 of spark arrestor 120 is stopped within pocket 66 of exhaust cap 24 .
- Retention ring 164 is then inserted within pocket 66 so that flange 160 is compressed between exhaust cap 24 and retention ring.
- Retention ring 164 is secured in place by first inserting tab 166 of retention ring 164 into groove 72 formed in pocket 66 (see FIG. 8). The remainder of retention ring 164 is then pushed into pocket 66 .
- a threaded fastener 170 is passed through hole 74 of exhaust cap 24 and threaded into hole 168 of retention ring 164 , thereby removably securing retention ring 164 to canister 20 so as to hold spark arrestor 120 in position.
- fastener 170 is simply unthreaded and retention ring 164 removed.
- spark barrier 136 is spaced apart from the end of muffler 10 . Specifically, spark barrier 136 is advanced part way into perf tube 80 . Many of the particles entering perf tube 80 from exhaust pipe 94 travel down perf tube 80 , past spark barrier 136 , and collect at the end of muffler 10 against flange 160 of neck 122 . As a result, a majority of the particles do not collect against spark barrier 136 . This is beneficial in that the collection of particles can clog spark barrier 136 and thus hamper engine performance. In alternative embodiments, however, it is appreciated that spark barrier 136 can be placed at any desired location along muffler 10 and even at the end thereof. As such, in alternative embodiments spark barrier 136 need not be mounted on an elongated neck but can be mounted on any form of base such as a metal ring.
- spark barriers be capable of capturing carbon particles with a diameter greater than 0.023 inches (0.58 mm) and have a total open area 200% greater than the smallest restriction in the exhaust port coming from the engine.
- Conventional spark arrestors use smooth surface, substantially dome shaped spark barriers to achieve the desired requirements.
- the problem with conventional spark barriers is that they occupy a relatively large space, particularly in diameter.
- the spark barrier is often the limiting factor in sizing the muffler. That is, conventional mufflers are often made larger than required so as to fit the spark barrier. By increasing the size of the muffler to occupy the spark barrier, the weight of the muffler goes up, thereby decreasing performance of the corresponding vehicle.
- One embodiment of the present invention is configured to minimize the size of spark barrier 136 by concentrating the area of mesh material per volume of space. In so doing, the size of the muffler can be decreased, thereby decreasing its weight. Alternatively, the muffler size can be retained but more packing material added so as to further decrease sound. In one embodiment, the concentration of area of mesh material per volume of space is increased by constricting the spark barrier 136 so that a plurality of folds are formed thereon.
- spark barrier 136 is comprised of a flat, round sheet of mesh or porous material that is pressed in a die so as to have the frustoconical configuration having the folds 137 extending along the length thereof.
- folds 137 increases the surface area of material per volume of space as compared to a plane frustoconical configuration.
- the term “folds” is broadly intended to include channels, grooves, ribs, waves, flutes, bends, and the like which are either regular or irregular.
- FIG. 9 depicted in FIG. 9 is one embodiment of substantially square shaped folds 138 while FIG. 8 depicts substantially triangular shaped folds 140 . It is appreciated that any fold configuration can be use.
- spark barrier 136 can have a variety of different configurations. For example, depicted in FIG. 11 is a spark barrier 136 A having a conical configuration with folds 137 extending along the length thereof. Depicted in FIG. 12 a spark barrier 136 B having a domed shaped configuration with folds 137 formed thereon. In the embodiment depicted in FIG. 13, in contrast to being taped, a spark barrier 136 C is shown having a substantially cylindrical configuration. In contrast to having a substantially circular transverse cross sectional configuration, spark barrier 136 C can be formed having a transverse cross sectional configuration that is square, triangular, or any other polygonal or irregular configuration. To prevent the exhaust from passing straight through spark barrier 136 without passing through the mesh or porous material, a cap 196 or other sealant is secured over free end 194 .
- the folds need not extend longitudinally along the spark barrier.
- folds 198 can be formed that radially encircle the spark barrier or folds 199 can be formed that are angled so as to spiral like threads.
- the folds can be positioned at any desired orientation or combination of orientations.
- FIG. 14 shows a longitudinal cross section view of another alternative embodiment of a spark barrier 142 having folds 144 that radially encircle spark barrier 142 .
- the mesh or porous material covers the free end of the spark barrier 144 .
- FIG. 14 shows a longitudinal cross section view of another alternative embodiment of a spark barrier 142 having folds 144 that radially encircle spark barrier 142 .
- the mesh or porous material covers the free end of the spark barrier 144 .
- FIG. 14 shows a longitudinal cross section view of another alternative embodiment of a spark barrier 142 having folds 144 that radially encircle spark barrier 142 .
- the mesh or porous material covers the free end of the spark barrier
- a longitudinal cross section view a spark barrier 150 is shown having a substantially frustoconical or cylindrical side wall 152 that terminates at an end face 154 . Rather then extending flat across end face 154 , however, a recessed pocket 156 is formed on end face 154 so as to increase the concentration of mesh material per volume of space. Additional folds can be formed along the surface of spark barrier 150 as discussed above.
- spark arrestor 202 comprises neck 122 as previously discussed.
- neck 122 is mounted on neck 122 .
- spark barrier 204 is formed from an arched sheet 206 of mesh or porous material, as depicted in FIG. 17, having opposing side edges 208 and 210 .
- arched sheet 206 is passed through a machine that creates all of the desired folds thereon.
- arched sheet 206 is rolled into a frustoconical configuration with side edges 206 and 208 being adjacently disposed.
- spark barrier 204 has a free end 212 with an opening 214 formed thereat.
- spark barrier 204 is mounted on flange 134 of neck 122 so as to cover the end of neck 122 .
- a cap 216 is mounted on free end 212 .
- opening 214 can be sealed closed by using brazing, soldering, crimping, welding, or a variety of other conventional techniques.
- a spark barrier can have more than four, more than seven, more than ten, or more than twenty separate and discrete folds.
- one or more continuous folds can repeatedly encircle and/or extend back and forth along a spark barrier.
- spark arrestor 120 can be selectively replaced with a nozzle 174 or a nozzle 190 .
- nozzle 174 comprises a tubular neck 176 having an annular flange 178 encircling and radially outwardly projecting therefrom.
- a threaded hole 184 extends through flange 178 .
- Neck 176 has an interior surface 180 that bounds a passageway 182 extending through neck 176 .
- Formed on interior surface 180 are a plurality of rifled grooves 183 .
- nozzle 174 is attached by simply sliding neck 176 into channel 68 of exhaust cap 24 until flange 178 is received within pocket 66 of exhaust cap 24 .
- Fastener 170 (FIG. 8) is then passed through hole 74 in end cap 24 and into threaded hole 184 , thereby securing nozzle 178 to canister 20 .
- Rifled grooves 183 help to concentrate and direct the exhaust and sound waves exiting through nozzle 174 .
- rifled grooves 183 are eliminated so that interior surface 180 of neck 176 is smooth.
- nozzle 190 simply comprises an annular ring having threaded hole 184 formed thereon. Nozzle 190 can be positioned within pocket 66 and secured therein by fastener 170 .
- One embodiment of the present invention thus includes a plurality of interchangeable nozzles 174 wherein passageway 182 of each nozzle is constricted to a different minimum diameter. By changing the minimum diameter, the exhaust back pressure within muffler 10 changes thereby also changing the exhaust sound and engine performance. Accordingly, the end user can selectively adjust sound and engine performance by selecting different nozzles.
- tubular body 22 having the flat surfaces and other configurations can be used with a discrete, separately attachable end cap and a conventional spark arrestor.
- the integral canister 20 can also be used with a conventional spark arrestor.
- spark arrestor 120 and/or the related spark barrier can be used with conventional mufflers.
Abstract
Description
- The present application claims priority to U.S. Provisional Application No. 60/422,541, filed Oct. 31, 2002, which for purposes of disclosure is incorporated herein by specific reference.
- 1. The Field of the Invention
- The present invention relates to mufflers and components thereof. More specifically, the present inventions relates to mufflers and components thereof for motorcycles, ATVs and other personal on- and off-road vehicles.
- 2. The Relevant Technology
- Personal motorcraft such as motorcycles and ATVs use mufflers to reduce noise. More recently, off-road vehicles have been required to incorporate a spark arrestor in the muffler to prevent a spark or carbon particle from exiting with the exhaust and potentially creating a fire. Conventional mufflers comprise a canister housing a noise reducing packing material. A separate and discrete outlet cap is bolted on the tail end of the canister. A screen type spark arrestor is typically disposed between the end cap and the canister.
- Although conventional mufflers generally sever their intended function, they have a number of shortcomings. For example, conventional mufflers are relatively expensive in that a uniquely configured muffler must be designed for each style of motorcraft. Furthermore, because spark arrestors are required to have a defined area size, most mufflers are larger and heavier than necessary to accommodate the spark arrestor. With the increasing demand for high performance motorcraft, it is desirable to provide mufflers that are relatively inexpensive and which provide and/or enable the user to optimize performance characteristics. Many conventional mufflers also have the downside in that their design results in relatively frequent clogging of the spark arrestor with particles from the exhaust. Such clogging has a detrimental affect on engine performance.
- Various embodiments of the present invention will now be discussed with reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope.
- FIG. 1 is a perspective view of a muffler;
- FIG. 2 is a top plan view of the muffler shown in FIG. 1;
- FIG. 3 is a disassembled view of the muffler shown in FIG. 1;
- FIG. 4 is a cross sectional side view of the canister shown in FIG. 3;
- FIG. 5 is a cross sectional side view of the canister shown in FIG. 4 taken along lines5-5;
- FIG. 6 is a cross sectional side view of the muffler shown in FIG. 2 taken along lines6-6;
- FIG. 7 is an elevated right end view of the muffler shown in FIG. 1;
- FIG. 8 is a perspective view of a spark arrestor of the muffler shown in FIG. 1;
- FIGS. 9 and 10 are alternative embodiments of folds for the spark barrier of the spark arrestor shown in FIG. 8;
- FIG. 11 is a side view of an alternative embodiment of a spark barrier having a conical configuration;
- FIG. 12 is a side view of an alternative embodiment of a spark barrier having a domed shaped configuration;
- FIG. 13 is a side view of an alternative embodiment of a spark barrier having a cylindrical configuration;
- FIG. 14 is an elongated cross sectional side view of an alternative embodiment of a spark barrier for the spark arrestor shown in FIG. 8;
- FIG. 15 is another elongated cross sectional side view of an alternative embodiment for a spark barrier of the spark arrestor shown in FIG. 8;
- FIG. 16 is a perspective view of an alternative embodiment of a spark arrestor;
- FIG. 17 is a top plan view of a blank used to make the spark barrier of the spark arrestor shown in FIG. 16;
- FIG. 18 is a perspective view of the spark barrier shown in FIG. 16; and
- FIG. 19 is a perspective view of a nozzle used to replace the spark arrestor shown in FIG. 8.
- Depicted in FIGS. 1 and 2 is one embodiment of an
inventive muffler 10 incorporating features of the present invention. Muffler 10 has an inlet end for receiving exhaust from an engine and an opposingoutlet end 14 for discharging the exhaust to the surround environment. Muffler 10 can be used in association with motorcycles, ATVs, or other personal motorcraft. - As depicted in FIG. 3,
muffler 10 comprises acanister 20 which includes atubular body 22 having anexhaust cap 24 integrally formed thereon.Tubular body 22 has anexterior surface 26 and aninterior surface 28 each extending between afirst end 30 and an opposingsecond end 32. As depicted in FIG. 4,interior surface 28 bounds anelongated chamber 29 having a centrallongitudinal axis 31 extending therethrough.Chamber 29 communicates with the exterior through an opening 33 atfirst end 30. A plurality of spaced apartholes 35 extend throughtubular body 22 adjacent to opening 33. In the embodiment depicted,tubular body 22 has a substantially uniform transverse cross section along the length thereof. - Depicted in FIG. 5 is a transverse cross section of
tubular body 22. As shown therein,tubular body 22 further comprises afirst side wall 34 and an opposingsecond side wall 36 each extending between atop wall 38 and anopposing bottom wall 40. Each ofside walls surface 42 andoutside surface 44. Each oftop wall 38 andbottom wall 40 have a substantially flat insidesurface 46 andoutside surface 48. Each oftop wall 38 andbottom wall 40 have a thickness T1 typically in a range between about 0.06 inches to about 0.09 inches while each ofside walls - Although not required, in the embodiment depicted thickness T1 is greater than thickness T2 For example, in one embodiment thickness T1 is about 0.075 inches while thickness T2 is about 0.05 inches. The unique configuration and thicknesses of the walls of
body 22 produce a number of unique benefits. For example, depicted in FIGS. 1 and 2 is amounting bracket 50 secured totop wall 38.Mounting bracket 50 comprises abase plate 52 having a substantiallyflat bottom surface 53. Abrace 54 is integrally formed with and upstands frombase plate 52. Brace 54 has an opening 56 extending therethrough to facilitate attachment to the vehicle. It is appreciated that opening 56 can be replaced with any attachment mechanism for securingmounting bracket 50 to the vehicle. - As a result of
outside surface 48 oftop wall 38 being flat,base plate 52 can be easily mounted at any select lateral, longitudinal, or angled location onoutside surface 48 oftop wall 38 so thatmuffler 10 can fit a variety of different motor vehicles. That is, many prior art mufflers have a circular or oval exterior transverse cross section. By changing the lateral position or angled orientation of the mounting bracket on such mufflers, the height and projected orientation of the mounting bracket also changes. Furthermore, the base plate of the mounting bracket is typically welded to the canister. To facilitate welding, the base plate must fit in a close tolerance with the surface of the canister. On oval or circular mufflers, the fit between the canister and the mounting bracket changes as the mounting bracket is moved on the canister. Accordingly, in conventional mufflers it is necessary to fabricate a number of different sized and shaped canisters and/or mounting brackets so as to enable the mufflers to fit a variety of different styles of motor vehicles. In contrast, by having flat mating surfaces betweencanister 20 and mountingbracket 50, a single configuration ofcanister 20 and mountingbracket 50 can be used to fit a variety of different motor vehicles. For example, in one embodiment a standardized billet machined mounting bracket can be positioned and fixed exactly where it is needed oncanister 20 without the use of alignment spacers. - Mounting
bracket 50 is secured to canister 20 using welding, rivets, or other conventional techniques. Depending on the style of vehicle on whichmuffler 10 is to be mounted, any number of mountingbrackets 50 can be mounted ontop wall 38 and/orbottom wall 40 at any desired location or orientation.Top wall 38 has the thickness T1, as discussed above, which is sufficient to enable welding or other desired securing techniques and to subsequently withstand the forces applied during use of the vehicle. In contrast, because a mounting bracket is not attached toside wall side walls canister 20 is reduced and the size ofchamber 29 increased. The size ofchamber 29 is further increased by the outward bowing ofside walls chamber 29 maximizes the amount of noise absorbing packing material that can be housed therein. - In alternative embodiments it is appreciated that each of the walls34-40 can have common or different thicknesses. For example,
top wall 38 can have a different thickness thanbottom wall 40. In yet another embodiment, all of the walls can have the same thickness. In some embodiments, it is also appreciated thattop wall 38 andbottom wall 40 need not be flat. For example,tubular body 22 can have a transverse cross sectional configuration that is circular, oval, square, or any other polygonal or irregular configuration. It is also appreciated that the configuration of the interior surface ofbody 22 can be the same as or different from the exterior surface ofbody 22. - As previously discussed, in the embodiment depicted
exhaust cap 24 is integrally formed withtubular body 22. As depicted in FIG. 4,exhaust cap 24 comprises anannular side wall 55 having anexterior surface 56 that radially inwardly tapers, at an angle relative totubular body 22, from afirst end 58 to an opposingsecond end 60. Although not necessarily required,exhaust cap 24 is shown having a greater thickness than the wall ofbody 22. This enablesexhaust cap 24 to be machined or otherwise mechanically processed to obtain the desired configuration. - Specifically,
first end 58 ofexhaust cap 24 has aninside face 64 that is integrally formed withsecond end 32 totubular body 22 and radially inwardly projects therefrom.Second end 60 ofexhaust cap 24 terminates at anexposed end face 62.End face 62 is disposed in aplane 65 that forms an inside angle θ1 with centrallongitudinal axis 31 that is typically less than about 80°. In one embodiment the angle θ1 is in a range between about 65° to about 80°. Other angles can also be used. - Recessed into
end face 62 ofexhaust cap 24 is apocket 66 that terminates at anannular shoulder 67. Extending betweenpocket 66 and inside face 64 ofexhaust cap 24 is achannel 68 communicating withchamber 29.Channel 68 is curved or angled relative centrallongitudinal axis 31 oftubular body 20. Atubular stem 70 projects frominside face 64 ofexhaust cap 24 so as to encircle a portion ofchannel 68 and extend intochamber 29. As will be discussed below in greater detail, agroove 72 extends frompocket 66 into the upper side ofsecond end 60 ofend cap 24. Furthermore, ahole 74 extends throughsecond end 60 ofend cap 24 and intopocket 66 at a location opposite ofgroove 72. - In one embodiment,
canister 20 is formed by impact extrusion. This process enables the integral formation ofbody 22 andexhaust cap 24 whereexhaust cap 24 has an increased thickness. In other embodiments,canister 20 can be formed by various conventional molding processes. It is also appreciated thatcanister 20 can be formed withbody 22 andexhaust cap 24 being separate and discrete members. In this embodiment,body 22 andexhaust cap 24 are secured together such as by welding, screwing, bolting, or any other conventional technique.Canister 20 is typically made of metal such as aluminum. Alternatively,canister 20 can be made of other metals or from non-metals such as fiber reinforced composite materials. - Conventional mufflers are formed with the end cap being separate from the body. In such embodiments, separate mounting flanges and fasteners, such as bolts, are required to secure the elements together. By forming
canister 20 as a single integral unit,canister 20 is formed so as to minimize weight, materials, and manufacturing costs. - Returning to FIG. 3,
muffler 10 further comprises aperf tube 80 having anexterior surface 82 and aninterior surface 84 each extending between afirst end 86 and an opposingsecond end 88.Interior surface 84 bounds apassageway 90 extending therethrough. Extending betweenexterior surface 82 and aninterior surface 84 along the length ofperf tube 80 are a plurality of perforations 92 (FIG. 6). - Coupled with and extending from
perf tube 80 is anexhaust pipe 94.Exhaust pipe 94 couples with the engine to deliver the exhaust from the engine tomuffler 10. Mounted at or adjacent to the coupling betweenperf tube 80 andexhaust pipe 94 is aninlet cap 100. As shown in FIGS. 3 and 7,inlet cap 100 comprises anannular base 102 that is welded or otherwise secured toperf tube 80 and/orexhaust pipe 94 and radially outwardly projects therefrom. Anannular sleeve 104 having spaced apart holes 106 extending therethrough, projects frombase 102. - During assembly as depicted in FIG. 6,
perf tube 80 is received withincanister 20 throughopening 33.Second end 88 ofperf tube 80 is advanced withchamber 29 so as to engage inside ofstem 70 ofexhaust cap 24. Simultaneously,sleeve 104 ofinlet cap 100 is received within opening 33 ofcanister 20 so thatinlet cap 100 covers opening 33.Fasteners 110, such as bolts or rivets, are passed intoholes 35 ofcanister 20 andholes 106 ofinlet cap 100 so as to secureinlet cap 100 tocanister 20. Anannular seal 102 is disposed therebetween so as to form an air tight seal. - As depicted in FIGS. 3 and 6, encircling
perf tube 80 and extending along the length thereof is aheat shield 114. In one embodiment,heat shield 114 comprises a tubular member formed of mesh screen.Heat shield 114 allows the exhaust to pass therethrough but prevents the noise absorbing packing, discussed below, from traveling therethrough and intopassageway 90 ofperf tube 80. - As also depicted in FIGS. 3 and 6, disposed between
heat shield 114 andcanister 20 and extending betweenexhaust cap 24 andinlet cap 100 isnoise absorbing packing 116. Although packing 116 is illustrated in FIG. 3 as an integral member, packing 116 typically comprises loosely packed fibers such as fiberglass, E-glass, or other conventional materials known to those skilled in the art. - During operation, the engine exhaust enters
passageway 90 ofperf tube 80 fromexhaust pipe 94. As the exhaust travels throughpassageway 90, portions of the exhaust and accompanying sound waves disperse out throughperforations 92 ofperf tube 80 and throughheat shield 114 so as to travel throughnoise absorbing packing 116. In turn, noise absorbing packing 116 dampens the sound waves before the exhaust exits out throughchannel 68 ofexhaust cap 24. - Returning to FIG. 3,
muffler 10 also comprises aremovable spark arrestor 120. As depicted in FIG. 8,spark arrestor 120 comprises a curved or benttubular neck 122 having aninterior surface 124 and anexterior surface 126 extending between afirst end 128 and an opposingsecond end 130.Interior surface 124 bounds apassageway 132 longitudinally extending therethrough. Anannular flange 134 radially outwardly projects fromfirst end 128 ofneck 122. Anannular flange 160 also radially outwardly projects fromneck 122 towardsecond end 130. - Outwardly projecting from
flange 134 so as to cover the opening topassageway 132 atfirst end 128 ofneck 122 is aspark barrier 136.Spark barrier 136 has a substantially frustoconical configuration which includes an enlarged mountingend 192 that constricts to an opposingfree end 194. As will be discussed below in greater detail, a plurality of exposedfolds 137 longitudinally extend between mountingend 192 andfree end 194. Mountingend 192 is secured to flange 134 such as by welding or other fastening techniques.Spark barrier 136 is comprised of a sheet of mesh or porous material typically having an open area in a range between about 25% to about 50%. The mesh material is typically comprised of wire but can also be comprised of other non-flammable materials. In contrast to a wire type mesh,spark barrier 136 can be comprised of a perforated or otherwise porous sheet of material such as a perforated metal sheet. In either event, the materials allows the free flow of exhaust gas therethrough but acts as a filter to prevent the passage of sparks or particles therethrough. -
Spark arrestor 120 is removably held in place by aretention ring 164 having acentral port 165 extending therethrough.Retention ring 164 has a top end with atab 166 projecting therefrom and an opposing bottom end with a threadedhole 168 formed thereat. - During assembly as depicted in FIG. 6,
spark barrier 136 is passed throughpassageway 68 ofexhaust cap 24 and intopassageway 90 ofperf tube 80 untilflange 160 ofspark arrestor 120 is stopped withinpocket 66 ofexhaust cap 24.Retention ring 164 is then inserted withinpocket 66 so thatflange 160 is compressed betweenexhaust cap 24 and retention ring.Retention ring 164 is secured in place by first insertingtab 166 ofretention ring 164 intogroove 72 formed in pocket 66 (see FIG. 8). The remainder ofretention ring 164 is then pushed intopocket 66. Once inserted, a threadedfastener 170 is passed throughhole 74 ofexhaust cap 24 and threaded intohole 168 ofretention ring 164, thereby removably securingretention ring 164 tocanister 20 so as to holdspark arrestor 120 in position. To selectively remove or replacespark arrestor 120,fastener 170 is simply unthreaded andretention ring 164 removed. - One of the benefits of
spark arrestor 120 comprisingelongated neck 122 is thatspark barrier 136 is spaced apart from the end ofmuffler 10. Specifically,spark barrier 136 is advanced part way intoperf tube 80. Many of the particles enteringperf tube 80 fromexhaust pipe 94 travel downperf tube 80,past spark barrier 136, and collect at the end ofmuffler 10 againstflange 160 ofneck 122. As a result, a majority of the particles do not collect againstspark barrier 136. This is beneficial in that the collection of particles can clogspark barrier 136 and thus hamper engine performance. In alternative embodiments, however, it is appreciated thatspark barrier 136 can be placed at any desired location alongmuffler 10 and even at the end thereof. As such, in alternative embodiments sparkbarrier 136 need not be mounted on an elongated neck but can be mounted on any form of base such as a metal ring. - Current US legislative standards require that spark barriers be capable of capturing carbon particles with a diameter greater than 0.023 inches (0.58 mm) and have a total open area 200% greater than the smallest restriction in the exhaust port coming from the engine. Conventional spark arrestors use smooth surface, substantially dome shaped spark barriers to achieve the desired requirements. The problem with conventional spark barriers, however, is that they occupy a relatively large space, particularly in diameter. The spark barrier is often the limiting factor in sizing the muffler. That is, conventional mufflers are often made larger than required so as to fit the spark barrier. By increasing the size of the muffler to occupy the spark barrier, the weight of the muffler goes up, thereby decreasing performance of the corresponding vehicle.
- One embodiment of the present invention is configured to minimize the size of
spark barrier 136 by concentrating the area of mesh material per volume of space. In so doing, the size of the muffler can be decreased, thereby decreasing its weight. Alternatively, the muffler size can be retained but more packing material added so as to further decrease sound. In one embodiment, the concentration of area of mesh material per volume of space is increased by constricting thespark barrier 136 so that a plurality of folds are formed thereon. For example,spark barrier 136 is comprised of a flat, round sheet of mesh or porous material that is pressed in a die so as to have the frustoconical configuration having thefolds 137 extending along the length thereof. The formation offolds 137 increases the surface area of material per volume of space as compared to a plane frustoconical configuration. As used herein, the term “folds” is broadly intended to include channels, grooves, ribs, waves, flutes, bends, and the like which are either regular or irregular. For example, depicted in FIG. 9 is one embodiment of substantially square shapedfolds 138 while FIG. 8 depicts substantially triangular shaped folds 140. It is appreciated that any fold configuration can be use. - In contrast to having a frustoconical configuration,
spark barrier 136 can have a variety of different configurations. For example, depicted in FIG. 11 is aspark barrier 136A having a conical configuration withfolds 137 extending along the length thereof. Depicted in FIG. 12 a spark barrier 136B having a domed shaped configuration withfolds 137 formed thereon. In the embodiment depicted in FIG. 13, in contrast to being taped, aspark barrier 136C is shown having a substantially cylindrical configuration. In contrast to having a substantially circular transverse cross sectional configuration,spark barrier 136C can be formed having a transverse cross sectional configuration that is square, triangular, or any other polygonal or irregular configuration. To prevent the exhaust from passing straight throughspark barrier 136 without passing through the mesh or porous material, acap 196 or other sealant is secured overfree end 194. - As also depicted in FIG. 13, the folds need not extend longitudinally along the spark barrier. For example, folds198 can be formed that radially encircle the spark barrier or folds 199 can be formed that are angled so as to spiral like threads. As such, in each embodiment the folds can be positioned at any desired orientation or combination of orientations. FIG. 14 shows a longitudinal cross section view of another alternative embodiment of a
spark barrier 142 havingfolds 144 that radially encirclespark barrier 142. In this embodiment the mesh or porous material covers the free end of thespark barrier 144. In yet another embodiment depicted in FIG. 15, a longitudinal cross section view aspark barrier 150 is shown having a substantially frustoconical orcylindrical side wall 152 that terminates at anend face 154. Rather then extending flat acrossend face 154, however, a recessedpocket 156 is formed onend face 154 so as to increase the concentration of mesh material per volume of space. Additional folds can be formed along the surface ofspark barrier 150 as discussed above. - Depicted in FIG. 16 is another alternative embodiment of a
spark arrestor 202 where like elements are identified by like reference characters.Spark arrestor 202 comprisesneck 122 as previously discussed. Mounted onneck 122 is aspark barrier 204. In contrast to sparkbarrier 136 which is die pressed from a circular sheet of material,spark barrier 204 is formed from anarched sheet 206 of mesh or porous material, as depicted in FIG. 17, having opposing side edges 208 and 210. Once cut or formed to size,arched sheet 206 is passed through a machine that creates all of the desired folds thereon. Next,arched sheet 206 is rolled into a frustoconical configuration withside edges spark barrier 204. In this embodiment,spark barrier 204 has afree end 212 with anopening 214 formed thereat. - Returning of FIG. 16,
spark barrier 204 is mounted onflange 134 ofneck 122 so as to cover the end ofneck 122. To prevent the exhaust gas from simply passing out throughopening 214, acap 216 is mounted onfree end 212. In contrast to usingcap 216, opening 214 can be sealed closed by using brazing, soldering, crimping, welding, or a variety of other conventional techniques. - It is appreciated that any number of folds can be formed on a corresponding spark barrier. For example, in one embodiment a spark barrier can have more than four, more than seven, more than ten, or more than twenty separate and discrete folds. In yet another embodiment, one or more continuous folds can repeatedly encircle and/or extend back and forth along a spark barrier.
- Returning to FIG. 3, depending on the intended riding environment for the vehicle,
spark arrestor 120 can be selectively replaced with anozzle 174 or anozzle 190. As shown in FIG. 19,nozzle 174 comprises atubular neck 176 having anannular flange 178 encircling and radially outwardly projecting therefrom. A threadedhole 184 extends throughflange 178.Neck 176 has aninterior surface 180 that bounds apassageway 182 extending throughneck 176. Formed oninterior surface 180 are a plurality of rifledgrooves 183. Oncespark arrestor 150 is removed,nozzle 174 is attached by simply slidingneck 176 intochannel 68 ofexhaust cap 24 untilflange 178 is received withinpocket 66 ofexhaust cap 24. Fastener 170 (FIG. 8) is then passed throughhole 74 inend cap 24 and into threadedhole 184, thereby securingnozzle 178 tocanister 20. - Rifled
grooves 183 help to concentrate and direct the exhaust and sound waves exiting throughnozzle 174. In alternative embodiments, rifledgrooves 183 are eliminated so thatinterior surface 180 ofneck 176 is smooth. For example,nozzle 190 simply comprises an annular ring having threadedhole 184 formed thereon.Nozzle 190 can be positioned withinpocket 66 and secured therein byfastener 170. One embodiment of the present invention thus includes a plurality ofinterchangeable nozzles 174 whereinpassageway 182 of each nozzle is constricted to a different minimum diameter. By changing the minimum diameter, the exhaust back pressure withinmuffler 10 changes thereby also changing the exhaust sound and engine performance. Accordingly, the end user can selectively adjust sound and engine performance by selecting different nozzles. - It is appreciated that the present invention has a number of unique features that can be used either in combination as disclosed above in
muffler 10 or can be used independently. For example,tubular body 22 having the flat surfaces and other configurations can be used with a discrete, separately attachable end cap and a conventional spark arrestor. Likewise, theintegral canister 20 can also be used with a conventional spark arrestor. In addition,spark arrestor 120 and/or the related spark barrier can be used with conventional mufflers. As such, it is appreciated that the various features and elements disclosed herein can be mixed and matched with different features disclosed herein and with prior art assemblies to form a variety of alternative novel embodiments. - The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (43)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/698,864 US20040089500A1 (en) | 2002-10-31 | 2003-10-31 | Muffler with spark arrestor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US42254102P | 2002-10-31 | 2002-10-31 | |
US10/698,864 US20040089500A1 (en) | 2002-10-31 | 2003-10-31 | Muffler with spark arrestor |
Publications (1)
Publication Number | Publication Date |
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US20040089500A1 true US20040089500A1 (en) | 2004-05-13 |
Family
ID=32312523
Family Applications (1)
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US10/698,864 Abandoned US20040089500A1 (en) | 2002-10-31 | 2003-10-31 | Muffler with spark arrestor |
Country Status (3)
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US (1) | US20040089500A1 (en) |
AU (1) | AU2003284386A1 (en) |
WO (1) | WO2004042203A2 (en) |
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US20060131102A1 (en) * | 2004-12-20 | 2006-06-22 | Arctic Cat, Inc. | Exhaust muffler |
US20080110693A1 (en) * | 2006-10-30 | 2008-05-15 | Yamaha Hatsudoki Kabushiki Kaisha | Exhaust System for Motorcycle |
US20090101434A1 (en) * | 2007-10-23 | 2009-04-23 | Sammut Paul H | Integrated modular exhaust system |
US20090107760A1 (en) * | 2007-10-24 | 2009-04-30 | Sammut Paul H | Exhaust system and muffler with reversible end-caps |
US20090313982A1 (en) * | 2008-06-18 | 2009-12-24 | Yamaha Hatsudoki Kabushiki Kaisha | Exhaust system for motorcycle |
US20100243371A1 (en) * | 2009-03-31 | 2010-09-30 | Honda Motor Co., Ltd. | Muffler device for motorcycle |
CN102758675A (en) * | 2011-04-25 | 2012-10-31 | 本田技研工业株式会社 | An engine for bestriding-type vehicles |
US20120325578A1 (en) * | 2011-06-21 | 2012-12-27 | E I Du Pont De Nemours And Company | Muffler assembly and method of making |
US8997922B1 (en) * | 2013-10-24 | 2015-04-07 | Kawasaki Jukogyo Kabushiki Kaisha | Exhaust muffler for vehicle |
US20150129352A1 (en) * | 2013-11-08 | 2015-05-14 | Volvo Car Corporation | Sound reduction system |
US9121319B2 (en) | 2012-10-16 | 2015-09-01 | Universal Acoustic & Emission Technologies | Low pressure drop, high efficiency spark or particulate arresting devices and methods of use |
US20170089239A1 (en) * | 2015-09-29 | 2017-03-30 | Honda Motor Co., Ltd. | Exhaust muffler and sound deadening element |
CN106640286A (en) * | 2017-02-04 | 2017-05-10 | 山东华盛农业药械有限责任公司 | Flame damping structure of silencer |
USD833936S1 (en) * | 2017-02-10 | 2018-11-20 | Igor Akrapovic | Exhaust pipe |
USD836514S1 (en) * | 2017-04-19 | 2018-12-25 | Igor Akrapovic | Exhaust pipe |
USD837119S1 (en) * | 2017-03-17 | 2019-01-01 | Igor Akrapovic | Exhaust pipe |
CN109236422A (en) * | 2018-11-29 | 2019-01-18 | 安徽合力股份有限公司 | A kind of fire extinguishing silencing apparatus |
USD875009S1 (en) * | 2017-11-03 | 2020-02-11 | Igor Akrapovic | Exhaust pipe |
USD906917S1 (en) * | 2019-03-19 | 2021-01-05 | Igor Akrapovic | Muffler for motor vehicles |
USD911898S1 (en) * | 2019-03-19 | 2021-03-02 | Igor Akrapovi{hacek over (c)} | Muffler for motor vehicles |
USD922922S1 (en) * | 2018-10-25 | 2021-06-22 | Akrapovi Hacek Over C Igor | Exhaust silencer |
USD928052S1 (en) * | 2018-10-25 | 2021-08-17 | Igor Akrapovic | Muffler for motor vehicles |
USD937723S1 (en) * | 2019-10-30 | 2021-12-07 | Igor Akrapovic | Muffler for motorcycles |
USD937724S1 (en) * | 2019-10-30 | 2021-12-07 | Igor Akrapovic | Muffler for motorcycles |
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SE0400903D0 (en) * | 2004-04-02 | 2004-04-02 | Electrolux Ab | Kick catcher for a muffler |
FR2919340B1 (en) * | 2007-07-23 | 2011-03-18 | Faurecia Sys Echappement | EXHAUST VOLUME OF A MOTOR VEHICLE EXHAUST LINE AND METHOD OF MANUFACTURING SUCH EXHAUST VOLUME. |
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US20170089239A1 (en) * | 2015-09-29 | 2017-03-30 | Honda Motor Co., Ltd. | Exhaust muffler and sound deadening element |
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USD833936S1 (en) * | 2017-02-10 | 2018-11-20 | Igor Akrapovic | Exhaust pipe |
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USD875009S1 (en) * | 2017-11-03 | 2020-02-11 | Igor Akrapovic | Exhaust pipe |
USD875010S1 (en) * | 2017-11-03 | 2020-02-11 | Igor Akrapovic | Muffler for motors |
USD922922S1 (en) * | 2018-10-25 | 2021-06-22 | Akrapovi Hacek Over C Igor | Exhaust silencer |
USD928052S1 (en) * | 2018-10-25 | 2021-08-17 | Igor Akrapovic | Muffler for motor vehicles |
CN109236422A (en) * | 2018-11-29 | 2019-01-18 | 安徽合力股份有限公司 | A kind of fire extinguishing silencing apparatus |
USD906917S1 (en) * | 2019-03-19 | 2021-01-05 | Igor Akrapovic | Muffler for motor vehicles |
USD911898S1 (en) * | 2019-03-19 | 2021-03-02 | Igor Akrapovi{hacek over (c)} | Muffler for motor vehicles |
USD937723S1 (en) * | 2019-10-30 | 2021-12-07 | Igor Akrapovic | Muffler for motorcycles |
USD937724S1 (en) * | 2019-10-30 | 2021-12-07 | Igor Akrapovic | Muffler for motorcycles |
Also Published As
Publication number | Publication date |
---|---|
WO2004042203A2 (en) | 2004-05-21 |
AU2003284386A8 (en) | 2004-06-07 |
WO2004042203A3 (en) | 2006-06-01 |
AU2003284386A1 (en) | 2004-06-07 |
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