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Publication numberUS2723626 A
Publication typeGrant
Publication date15 Nov 1955
Filing date1 Mar 1949
Priority date1 Mar 1949
Publication numberUS 2723626 A, US 2723626A, US-A-2723626, US2723626 A, US2723626A
InventorsPeter J Endebak
Original AssigneeTuthill Pump Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pump drive
US 2723626 A
Abstract  available in
Images(3)
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Claims  available in
Description  (OCR text may contain errors)

Nov. 15, 1955 P. J. ENDEBAK 2,723,626

PUMP DRIVE Filed March l, 1949 3 Sheets-Sheet l Nov. l5, 1955 P. J. ENDI-:BAK 2,723,625

PUMP DRIVE Filed March 1, 1949 s sheets-sheet 2 Nov. 15, 1955 Filed March 1, 1949 PUMP DRIVE 3 Sheets-She@C 5 Unite tes atent PUMP DRIVE Peter J. Endebak, Chicago, Ill., assigner to Tuthill Pump Company, a corporation of Illinois Application March 1, 1949, Serial No. 78,905 4 Claims. (Cl. 10S-205) This invention relates to pumps for handling liquids in pest and weed control, and has for its principal object to provide a simple, durable pump that may be readily driven from the power take-off of a tractor.

Fig. l is a front side elevation of a pump embodying the invention;

Fig. 2 is a vertical central section through the same crosswise to the driving shaft;

Fig. 3 is a vertical section in a plane through the axes of the gears;

Fig. 4 is a perspective view of the end portion of the shaft for the main gear;

Fig. 5 is a perspective view of a driving connection adapted to be associated with that shaft and a power takeoff of a tractor;

Fig. 6 is an enlarged fragment of Fig. 3 with a different driving connection associated with the main shaft of the pump; and

Fig. 7 is an end view of Fig. 6 looking from the right.

The pump casing includes a at sided body portion 10 having a contour shown in Figs. l and 2, a front cover plate 11, and a back cover plate 12 secured to the body portion by bolts 13.

The body portion is provided with a pump chamber, generally indicated by 14 (Fig. 2), in which are received the pump gears 15 and 16, and which is ported at 17 and 18 to provide a low pressure or intake chamber section and a high pressure or discharge chamber section, respectively.

The smaller gear or pinion 16 is mounted on a hollow shaft 19 having its end portions journalled in bearings 20 pressed into bearing sockets 21 in the covers 11 and 12, respectively, against the bearing seats 22 and 23.

The main pump gear 15 is keyed to a hollow shaft 24 having its end portions journalled in bearings 25 and 26 pressed into the covers 11 and 12. The bearing 26 is pressed into a socket 27 against a bearing seat 28, and the bearing is pressed into a bore 29 terminating in a counterbore 30 opening to the outside of the back cover 12.

The clearance between the side faces of the gears 15 and 16 and the adjacent faces of the front and back covers 11 and 12 is on the order of 11/2 to 2 thousandths, as indicated by the reference numeral 31, whereas the clearance between the opposite sides of the gears 15 and 16 and the adjacent faces of the bearings 20, 25, and 26 is on the order of plus 1/2 thousandths to 0. By this means, the bearings form an effective seal with the pump gears, and prevent leakage from the discharge chamber 18 to the intake chamber 17.

The inner faces of the front and back covers 11 and 12 are cored out, or otherwise recessed, at 34 in line with similar recesses in the bearings 25 and 26 communicating with grooves 36 along the bore of the bearings 25 and 26 open to the surface of the shaft 24.

CII

This provides a relief connection to the intake or low pressure side of the pump to prevent the possibility of pressure developing adjacent to the ends of the shaft 24 that would throw the arrangement out of balance.

Preferably, the bearings 25 and 26 are made of sintered carbon, and, in the course of machining the bearing surfaces, small particles of carbon are pushed into the pores of the bearing material, and any irregularity in the shaft tends to loosen those particles, which then tend to work between the shaft and the bearing, and travel along the surface. Being extremely hard material, they become abrasive. The grooves 36, however, form a trap for those particles by which they are readily eliminated from the bearing surfaces.

The counter bore 30, and therefore the joint between the shaft 24 and the back cover 12, with the bearing 25 is etfectively closed and sealed by a metal cap 33 lled with a rubber ring 39 having an angular groove 40.

Some of the liquids used for weed and pest control are highly corrosive, and, in order to protect the pump from corrosion by those or other materials, it is preferable to make the several parts of corrosion resisting material. For example, in a pump that has been found satisfactory, the casing is made of heat treated aluminum alloy known as Alcoa 35 6T6.

The gear 16 and the shaft 19 are made of an alloy containing approximately 88% copper, 10% tin, 2% zinc. The gear 15 and the shaft 24 are made of an alloy composed of approximately 9 to 10% aluminum; iron 1.25 maximum, the principal remainder copper.

In order to permit the pump to be driven from the power take-off of a tractor, or other machine, the shaft 24 is provided with a driving connection comprising a sleeve 42 having an inturned ange 43 equipped with teeth 44 adapted to engage in the grooves of a spline shaft, such as a standard SAE spline shaft customarily used on tractors. The sleeve 42 is provided with an opening 45 adapted to be aligned with a threaded openign 46 in the shaft 24 to receive a screw threaded Sems fastener unit 47, which includes a locking washer 48.

This driving connection is particularly suited to use with a 1% spline shaft, commonly forming the power take-off of a Ford-Ferguson tractor, indicated by the dotted lines 48 in Fig. 3.

For use with a 1% SAE spline shaft forming the power take-olf on some tractors, there is provided another driving connection 50, shown in Figs. 6 and 7, which cornprises a length of tubing adapted to be telescoped within the shaft 24 substantially as shown in Fig. 6, and threaded at 51 to receive the Sems fastener unit 47.

The projecting end of the driving connection 50 has inwardly directed teeth 52 adapted to be received in the grooves of the SAE spline shaft, indicated by the dotted lines 53 in Fig. 6. That shaft should project well into the sleeve 50 substantially as indicated, and the projecting portion of the latter should extend within the overhanging gear casing 54 of the tractor.

The driving connections are preferably made of steel and case hardened, particularly at the toothed portions.

The body portion 10 is provided with threaded openings 51 at the bottom to receive stud bolts 52a. In some uses, they will fasten the pump to a base, generally indicated at 53a, Fig. l; and, in others, to an angular base, generally indicated at 54, Fig. 2; many having slots 55 to receive bolts that ordinarily hold a part of the tractor casing in place.

I claim:

1. In a pump and driving means assembly of the class in which a gear pump having a hollow shaft to be driven which has smooth internal and external surfaces is telescoped over the externally splined portion of the power take-off shaft of a tractor or like machine, the cornbination with said telescopedv shafts of a connector cornprising a hollow body terminating at one end in a tubular portion provided with smooth internal and external surfaces telescoped over the splined portion of said power take-off shaft and having one of its said surfaces engaged with one of the named surfaces of the pump shaft and terminating at its other end in inwardly directed teeth drivingly engaged in the grooves of said splined portion, and fastening means extending into the tubular portion of the connector and into the pump shaft for securing said shafts against relative turning.

2. In a pump and driving means assembly of the class in which a gear pump having a hollow shaft to be driven which has smooth internal and external surfaces is telescoped over the externally splined portion of the power take-off shaft of a tractor or like machine, the combination with said telescoped shafts of a connector comprising a hollow body terminating at one end in a tubular portion provided with a smooth internal surface telcscoped over the splined portion of said power take-off shaft and having its said surface engaged with the outer surface of the pump shaft and terminating at its other end in inwardly directed teeth drivingly engaged in the grooves of said splined portion, and fastening means extending into the tubular portion of the connector and into the pump shaft for securing said shafts against relative turning.

3. In a pump and driving means assembly of the class in which a gear pump having a hollow shaft to be driven which has smooth internal and external surfaces is telescoped over the externally splined portion of the power take-olf shaft of a tractor or like machine, the combination with said telescoped shafts of a connector comprising a hollow body terminating at one end in a tubular portion provided with a smooth external surface telescoped over the splined portion of said power take-off shaft and having its said surface engaged with the inner surface of the pump shaft and terminating at its other end in inwardly directed teeth drivingly engaged in the grooves of said splined portion, and fastening means extending into the tubular portion of the connector and into the pump shaft for securing said shafts against relative turning.

4. In a pump and driving means assembly of the class in which a gear pump having a hollow shaft member to be driven which has smooth internal and external surfaces is telescoped over the externally splined portion of the power take-off shaft of a tractor or like machine, the combination with said telescoped shaft member and shaft of a connector member comprising a hollow body terminating at one end in a tubular portion provided with smooth internal and external surfaces telescoped over the splined portion of said power takeoff shaft and having one of its said surfaces engaged with one of the named surfaces of the pump shaft member and terminating at its other end in inwardly directed teeth drivingly engaged in the grooves of said splined portion, and fastening means securing said shaft and shaft member against relative turning comprising a set of circumferentially spaced screws extending through one of said members and threaded into the other member.

References Cited in the tile of this patent UNITED STATES PATENTS 1,376,903 Strickland May 3, 1921 1,973,702 Cooke Sept. 18, '1934 2,115,325 Behringer Apr. 26, 193.8 2,174,223 Frauenthal Sept. 26, 1'939 2,176,049 Floraday Oct. 17', 1939 2,176,322 Barrett Oct. 17, 1939 2,198,654 Calkins et al Apr. 30, 19.40 2,288,596 Pierce July 7, 1942 2,365,146 Wichorek Dec. 12, 1944. 2,374,207 Jackson Apr. 24, 19.45' 2,391,072 Pugh Dec. 18,v 1945 2,466,097 Graue Apr. 5, 1949 2,525,695 Lombard Oct. 10, 1950

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1376903 *5 Aug 19183 May 1921Detroit Accessories corporationTump sor kotos-vehicles
US1973702 *31 Mar 193318 Sep 1934Cooke Frank VSlip joint
US2115325 *4 Dec 193626 Apr 1938Speedry Gravure CorpPump for ink circulating systems
US2174223 *6 Nov 193726 Sep 1939Bantam Bearings CorpUniversal joint
US2176049 *17 Jun 193617 Oct 1939Detroit Harvester CoWindow regulator clutch
US2176322 *28 Jun 193717 Oct 1939Gar Wood Ind IncFluid pump
US2198654 *23 Dec 193830 Apr 1940Chrysler CorpSplined coupling
US2288596 *7 Aug 19397 Jul 1942David E OwenAir compressor
US2365146 *16 Feb 194212 Dec 1944Pesco Products CoPump shaft seal assembly
US2374207 *18 Nov 194324 Apr 1945Jackson Tom CDual-rotation test drive
US2391072 *21 Jun 194418 Dec 1945Plessey Co LtdHydraulic pump
US2466097 *23 Aug 19485 Apr 1949Graue Lyle HAdapter coupling
US2525695 *15 Aug 194610 Oct 1950Rolls RoyceFlexible shaft coupling
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3083894 *11 Jul 19572 Apr 1963Borsig AgRotary piston engine
DE3615830A1 *10 May 198620 Nov 1986Barmag Barmer MaschfRotary piston pump, in particular discharge gear pump
Classifications
U.S. Classification418/191, 418/181, 418/179, 418/39, 464/157
International ClassificationF04C2/18, F04C15/00, F04C2/14
Cooperative ClassificationF04C2/14, F04C15/00, F04C2/18
European ClassificationF04C2/14, F04C15/00