US3612217A - Antiwhistle means for exhaust system - Google Patents

Antiwhistle means for exhaust system Download PDF

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Publication number
US3612217A
US3612217A US67035A US3612217DA US3612217A US 3612217 A US3612217 A US 3612217A US 67035 A US67035 A US 67035A US 3612217D A US3612217D A US 3612217DA US 3612217 A US3612217 A US 3612217A
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United States
Prior art keywords
conduit
sharp
hole
exhaust system
recess
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US67035A
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Robert A Heath
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AB Dick Co
Tenneco Inc
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Tenneco Inc
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Assigned to AM INTERNATIONAL INCORPORATED, A DE. CORP. reassignment AM INTERNATIONAL INCORPORATED, A DE. CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: HARRIS GRAPHICS CORPORATION
Expired - Lifetime legal-status Critical Current

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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
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/14—Dead or resonance chambers connected to gas flow tube by relatively short side-tubes

Definitions

  • a gas passage conduit of the type used in internal combustion engine exhaust systems has an outwardly extending recess formed in its wall adjacent a sharp-edged hole that is connected to the housing of a sound attenuating chamber.
  • ANTIWIIISTLE MEANS FOR EXHAUST SYSTEM BRIEF SUMMARY OF THE INVENTION It is the purpose of this invention to eliminate the whistle that occurs when gases in a conduit flow by a sharp-edged hole, such as the hole by which a tuning tube or sound attenuating chamber is connected to the conduit.
  • the invention accomplishes this by means of a recess formed in the otherwise smooth-walled conduit which is located adjacent the upstream edge of the hole, the recess acting to break up the normal flow pattern of gas which would result in a whistle.
  • FIG. 1 is a side elevation, partly broken away and shown schematically, of an internal combustion engine exhaust system embodying the invention
  • FIG. 2 is a perspective view of the structure with the circle 2 of FIG. 1 shown on an enlarged scale;
  • FIG. 3 is a side elevation of a slightly modified form of structure as compared with that of FIG. 2;
  • FIG. 4 is a cross section along the line 4-4 of FIG. 3;
  • FIG. 5 is a view similar to FIG. 4 but showing another modification.
  • FIG. 6 is also a view similar to FIG. 4 but showing still another modification.
  • the internal combustion engine 1 has an exhaust manifold 3 which delivers gases to an exhaust system 5 that includes an exhaust conduit 7 that carries gases to a muffler 9 which in turn discharges them, after silencing, into a tailpipe 11.
  • an exhaust system 5 that includes an exhaust conduit 7 that carries gases to a muffler 9 which in turn discharges them, after silencing, into a tailpipe 11.
  • a tuning tube or silencing chamber of some suitable design and connect it to the exhaust conduit 7 or to the tailpipe 11 at an optimum location.
  • the tubular housing 13 constitutes such a silencing means and is shown in a fonn of a quarter wavelength-type tuning tube that is welded around a hole 15 that is formed in the wall of the conduit 7.
  • the gas flowing through conduit 7 can pass by the sharp upstream edge 16 of the hole 15 and produce a whistle.
  • the wall of the conduit 7 on the upstream side of the hole 15 and adjacent the upstream sharp edge 16 thereof is deformed outwardly at 17 to provide a recess 19.
  • the space provided by the recess interferes with the normal flow pattern of the gas and overcomes the tendency of the gas to whistle as it passes the sharp edge on the upstream side of the hole 15.
  • FIG. 2 shows a single deformation 17 of some angular extent located in alignment with the housing I3 while the structure of FIG. 3 shows the same deformation [7 along with additional circular dimples 21 that also extend outwardly from the tubing.
  • FIG. 5 shows a continuous recess formed by an outwardly extending bead 23 that extends around most of the circumference of the conduit 7; and
  • FIG. 6 shows an annular ring 25 that extends completely around the conduit 7.
  • the recess providing deformations are located adjacent to the upstream edge of the hole 15 and when properly sized and arranged the recesses act to break up the flow pattern and overcome the tendency to whistle.
  • a substantially uniform diameter tubular conduit providing a passage for gas flow in the system and having a sharp-edged hole in the wall thereof
  • a sound attenuating device having housing secured to said conduit and opening through said sharp-edged hole into the conduit, said conduit having at least one outwardly extending deformation formed in the wall thereof providing a recess located adjacent the upstream edge of said hold, said recess breaking up the normal whistle-causing gas flow pattern across the sharp edge of said hole.

Abstract

A gas passage conduit of the type used in internal combustion engine exhaust systems has an outwardly extending recess formed in its wall adjacent a sharp-edged hole that is connected to the housing of a sound attenuating chamber.

Description

United States Patent Robert A. Heath Jackson, Mich. T6 7,035
Aug. 26, 1970 Oct. 12, 1971 Tenneco lnc. Racine, Wis.
Inventor Appl. No. Filed Patented Assignee ANTIWHISTLE MEANS FOR EXHAUST SYSTEM 1 Claim, 6 Drawing Figs.
U.S. Cl 181/59, 181/63 Int. Cl F0ln l/02, F0111 7/00 Field ofsearchmfi 181/48,59,
Relerenees Cited UNITED STATES PATENTS 1,938,973 12/1933 Oldberg 181/63 2,160,332 5/1939 Huber 181/63 2,251,880 8/1941 Cary et a1. 181/63 2,297,046 9/1942 Boume 181/59 3,415,338 12/1968 McMillan 181/63 Primary ExaminerRobert S. Ward, Jr. Attorney-Harness, Dickey & Pierce ABSTRACT: A gas passage conduit of the type used in internal combustion engine exhaust systems has an outwardly extending recess formed in its wall adjacent a sharp-edged hole that is connected to the housing of a sound attenuating chamber.
ANTIWIIISTLE MEANS FOR EXHAUST SYSTEM BRIEF SUMMARY OF THE INVENTION It is the purpose of this invention to eliminate the whistle that occurs when gases in a conduit flow by a sharp-edged hole, such as the hole by which a tuning tube or sound attenuating chamber is connected to the conduit.
The invention accomplishes this by means of a recess formed in the otherwise smooth-walled conduit which is located adjacent the upstream edge of the hole, the recess acting to break up the normal flow pattern of gas which would result in a whistle.
DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevation, partly broken away and shown schematically, of an internal combustion engine exhaust system embodying the invention;
FIG. 2 is a perspective view of the structure with the circle 2 of FIG. 1 shown on an enlarged scale;
FIG. 3 is a side elevation of a slightly modified form of structure as compared with that of FIG. 2;
FIG. 4 is a cross section along the line 4-4 of FIG. 3;
FIG. 5 is a view similar to FIG. 4 but showing another modification; and
FIG. 6 is also a view similar to FIG. 4 but showing still another modification.
DETAILED DESCRIPTION OF THE INVENTION The internal combustion engine 1 has an exhaust manifold 3 which delivers gases to an exhaust system 5 that includes an exhaust conduit 7 that carries gases to a muffler 9 which in turn discharges them, after silencing, into a tailpipe 11. In order to obtain optimum sound attenuation, it is common practice to use a tuning tube or silencing chamber of some suitable design and connect it to the exhaust conduit 7 or to the tailpipe 11 at an optimum location. The tubular housing 13 constitutes such a silencing means and is shown in a fonn of a quarter wavelength-type tuning tube that is welded around a hole 15 that is formed in the wall of the conduit 7. In usage of the structure so far described, the gas flowing through conduit 7 can pass by the sharp upstream edge 16 of the hole 15 and produce a whistle.
In accordance with this invention, the wall of the conduit 7 on the upstream side of the hole 15 and adjacent the upstream sharp edge 16 thereof is deformed outwardly at 17 to provide a recess 19. The space provided by the recess interferes with the normal flow pattern of the gas and overcomes the tendency of the gas to whistle as it passes the sharp edge on the upstream side of the hole 15.
FIG. 2 shows a single deformation 17 of some angular extent located in alignment with the housing I3 while the structure of FIG. 3 shows the same deformation [7 along with additional circular dimples 21 that also extend outwardly from the tubing. FIG. 5 shows a continuous recess formed by an outwardly extending bead 23 that extends around most of the circumference of the conduit 7; and FIG. 6 shows an annular ring 25 that extends completely around the conduit 7. In all cases, the recess providing deformations are located adjacent to the upstream edge of the hole 15 and when properly sized and arranged the recesses act to break up the flow pattern and overcome the tendency to whistle.
I claim:
1. In a conduit arrangement for flowing gas such as the exhaust system of an internal combustion engine, a substantially uniform diameter tubular conduit providing a passage for gas flow in the system and having a sharp-edged hole in the wall thereof, a sound attenuating device having housing secured to said conduit and opening through said sharp-edged hole into the conduit, said conduit having at least one outwardly extending deformation formed in the wall thereof providing a recess located adjacent the upstream edge of said hold, said recess breaking up the normal whistle-causing gas flow pattern across the sharp edge of said hole.

Claims (1)

1. In a conduit arrangement for flowing gas such as the exhaust system of an internal combustion engine, a substantialLy uniform diameter tubular conduit providing a passage for gas flow in the system and having a sharp-edged hole in the wall thereof, a sound attenuating device having housing secured to said conduit and opening through said sharp-edged hole into the conduit, said conduit having at least one outwardly extending deformation formed in the wall thereof providing a recess located adjacent the upstream edge of said hold, said recess breaking up the normal whistle-causing gas flow pattern across the sharp edge of said hole.
US67035A 1970-08-26 1970-08-26 Antiwhistle means for exhaust system Expired - Lifetime US3612217A (en)

Applications Claiming Priority (1)

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US6703570A 1970-08-26 1970-08-26

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US3612217A true US3612217A (en) 1971-10-12

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US67035A Expired - Lifetime US3612217A (en) 1970-08-26 1970-08-26 Antiwhistle means for exhaust system

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US (1) US3612217A (en)
AT (1) AT306450B (en)
CH (1) CH546885A (en)
DE (1) DE2137263C3 (en)
FR (1) FR2112915A5 (en)
GB (1) GB1362274A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696368A (en) * 1986-03-14 1987-09-29 Humco, Inc. Method of protecting vehicle exhaust system
US5493080A (en) * 1993-03-05 1996-02-20 Ab Volvo External arrangement for damping sounds in a pipe system
WO2001021941A1 (en) * 1999-09-22 2001-03-29 Aktiebolaget Electrolux Two-stroke internal combustion engine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938973A (en) * 1932-09-28 1933-12-12 Oldberg Virgil Muffler
US2160332A (en) * 1937-01-23 1939-05-30 Gen Motors Corp Silencer
US2251880A (en) * 1936-04-24 1941-08-05 Hayes Ind Inc Muffler and silencer construction
US2297046A (en) * 1939-08-25 1942-09-29 Maxim Silencer Co Means for preventing shock excitation of acoustic conduits or chambers
US3415338A (en) * 1967-01-23 1968-12-10 Arvin Ind Inc Anti-whistle pipe connection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1938973A (en) * 1932-09-28 1933-12-12 Oldberg Virgil Muffler
US2251880A (en) * 1936-04-24 1941-08-05 Hayes Ind Inc Muffler and silencer construction
US2160332A (en) * 1937-01-23 1939-05-30 Gen Motors Corp Silencer
US2297046A (en) * 1939-08-25 1942-09-29 Maxim Silencer Co Means for preventing shock excitation of acoustic conduits or chambers
US3415338A (en) * 1967-01-23 1968-12-10 Arvin Ind Inc Anti-whistle pipe connection

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696368A (en) * 1986-03-14 1987-09-29 Humco, Inc. Method of protecting vehicle exhaust system
US5493080A (en) * 1993-03-05 1996-02-20 Ab Volvo External arrangement for damping sounds in a pipe system
WO2001021941A1 (en) * 1999-09-22 2001-03-29 Aktiebolaget Electrolux Two-stroke internal combustion engine
US6698194B2 (en) 1999-09-22 2004-03-02 Aktiebolaget Electrolux Two-stroke internal combustion engine

Also Published As

Publication number Publication date
CH546885A (en) 1974-03-15
DE2137263B2 (en) 1975-04-17
FR2112915A5 (en) 1972-06-23
DE2137263C3 (en) 1975-12-11
AT306450B (en) 1973-04-10
DE2137263A1 (en) 1972-03-02
GB1362274A (en) 1974-08-07

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AS Assignment

Owner name: AM INTERNATIONAL INCORPORATED, A DE. CORP., ILLINO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:HARRIS GRAPHICS CORPORATION;REEL/FRAME:005018/0144

Effective date: 19881006