US2702509A - Rotary pump - Google Patents

Rotary pump Download PDF

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Publication number
US2702509A
US2702509A US267949A US26794952A US2702509A US 2702509 A US2702509 A US 2702509A US 267949 A US267949 A US 267949A US 26794952 A US26794952 A US 26794952A US 2702509 A US2702509 A US 2702509A
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Prior art keywords
pump
plate
face
gear
pressure
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Expired - Lifetime
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US267949A
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Garnier Georges
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AIR EQUIPMENT
AIR-EQUIPMENT
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AIR EQUIPMENT
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01CROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00Rotary-piston machines or engines
    • F01C1/08Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • F01C1/12Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
    • F01C1/14Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F01C1/18Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03CPOSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C2/00Rotary-piston engines
    • F03C2/08Rotary-piston engines of intermeshing-engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/08Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/12Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C2/14Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C2/18Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with similar tooth forms

Description

Feb. 22, 1955 G, GARNlER 2,702,509

ROTARY PUMP Filed Jan. 24, 1952 lll mvENToR: GEORGES GAmsR UnitedStates Patent() ROTARY PUB/IP Georges Garnier, Asnieres, France, assignor to Air- Equipment, Asnieres, France, a French company Application January 24, 1952, serial No. 267,949 claims priority, application France Api-ii 6, 1951 4 claims. (ci. 10s- 126) This invention relates to new improvements in lrotary pumps and more particularly in pumps of the ge ar type.

It is a well-known fact that the pressure at which gear pumps'can Ib-e used is limited in practice by the play on the outside diameter of the gears and, above all, by the lateral deformation of the lateral closure member. This deformation increases with the rise in pressure and causes yleakage onthe gear faces. c

It -has heretofore been proposed to obviate this draw back by applying the pressure of a spring or even of the 'discharged liquidr itself to the back face 4ofan axially adjustable end plate or bushing. However, this arrangement has the drawback that it necessitates a very precise fit of the gear axle bushings, in particular at the line where the flanges of two adjoining bushings meet, this meeting line being ensured-by a flat part machined With great precision in order to obtain acceptable stanchness of the um p Itpis an Iobject of the present invention to provide an improved construction of a rotary pump comprising wear compensating elements intended to prevent leakages on the faces of the rotors, which elements do not require a too precise fit, that is to say, which are as simple as possible in design.

With -this principal object in View, the invention consists according to its lbroadest aspect in a pump of the -type described above wherein a simple, non-sliding thin plate is applied agai-nst the axial ends of the rotors by the delivery pressure of the pump.

Another object of the invention resides in the application, to a pump of this type, of means intended to restrict the effect of the discharge pressure applied.

With this object in view, the invention fur-ther consists in restricting the effect of the said `discharge pressure to annular zones on the circumference of the said flexible thin plate, in particular Iby the use of annular sealing rings, preferably toric and made of elastic material.

Other characteristics and particular features of the present invention will lbecome apparent from the following description, which illustrates two specific embodiments of an improved gear pump, the said embodiments being disclosed merely as an indication, and shown diagrammatically on the accompanying drawing forming a part 'of said description.

'In the drawing:

iFig. 1 is a section through the shafts of the two gears of a `first embodiment of an improved gear pump;

iFig. 2 is a perspective View of certain of the elements of -the pump shown in lrFig. l, separated from each other;

Fig. 3 is a similar view to that shown in Fig. 1, but of a second embodiment of an improved gear pump;

iFig. 4 is a front view of the pump lshown in Fig. 3, the cover and the lateral supporting plate having been removed;

Fig. 5 is a section view along vthe line V-V of Fig. 4.

In the embodiment shown in Figs. 1 and 2, which relate -to a pump of which .the lgears have no trunnions, `1 is the front `or Imain 4bearing in which are arranged a ball bearing 2 and a bush-ing 3 supporting the driving spindle 4 of the pump; on this spindle `are keyed the driving pulley '5 and the driving gear 6 in mesh with the driven gear 7. 8 is the pump casing and 9 is the pump cover.

`On both sides of the pump gears `6 and 7 are end plates 10 and 11 `made of a material with low coefficient of friction.

Stanchness is ensured Iby plate 'sealing rings 12, 13, 30

14 and 15, and by a bushing sealing ring 16, all of the 2,702,509 j Patented Fein-V22, 1955 'ice said rings being recessed in annular housings, one of which, numbered 17, can be seen more particularly in Fig. 2.

The end plate 10 has a hole 10a at the outlet of the bushing 3, the diameter of the said hole corresponding to the diameter of .the flange 3a of the said bushing, the sealing ring 16 coming into contact both with the flange and with the plate in question, which ensures good tight ness in the direction of the zone of junction of the bushing and plate, which are very easy to machine.

The cover 9 is provided with two annular grooves 9a and 9b, communicating with each other opposite the meshing zone of the gears, and serving to house elastic holding rings 18 and 19 which form packing joints intended to limit the pressure surface on the plate 11 and tlensure slight initial pressure when the pump is running i `e.

Opposite the meshing zone of the pump gears the plate 1-1 is pierced by a hole 20 through which the pump discharge communicates with the annular grooves 9a and 9b, which therefore causes the rear surface of the plate 11 to be under the same pressure as the surface which is `in contact with the face of the gears 6 and 7.

It will at once be realised that, whatever may be the deformation of the cover, the tightness of the pump is perfectly ensured on the gear faces.

In the embodiment shown in Figs. 3 to 5, which relate lto a pump of which the gears have trunnions, 21 is the front or main bearing, 22 the pump cover. In these members are arranged the bushings 23, 24, 25 and 26 for the journals 27a, 27b of the driven gear 27, for the journal 28a of the driving gear 28, and for the driving spindle 29, on which the latter gear is keyed. 30 is the pump housing interposed between the members 21 and 22.

The faces of the gears 27 and 28 are in contact with the plates 31 and 32, which are made of a material having a low coefficient of friction. Annular gaskets 33, 34, 35, l36, 37, 38 and 39, arranged in grooves (40 on Fig, 4) in the members 21, 22 and 30 ensure tightness against leakage towards the outside.

The plates 31 and 32 are (as in the case of the single plate 11 in the preceding example) held in place on their rear surface by elastic holding rings 41, 42, 43 and 44, which fill the same function as the rings 18 and 19 in the preceding example. Here again, the rear surface of each plate communicates with the discharge of the pump through an orifice 45.

In order to simplify machining, the bushings 23, 24, 25 and 26 have no anges fitted into the holding plates. The latter rest directly against the front surface of each bushing.

.While the invention has been disclosed in connection with certain specific embodiments thereof, it is to be understood that these are by way of example rather than limitation.

What I claim is:

1. Ina pump of the character described, a pump housin g having front and rear walls, at least a rotor within said housing, a wear control plate in said housing associated with s aid .rotor on at least one axial face thereof, said plate 4being interposed between said face of said rotor and the adjacent wall of said housing and having the edge thereof fixed to said housing, said plate being further resilient, elastic and capable of being deflected so that it can be urged toward said face of said rotor by a Ihuid pressure, an annular groove in said adjacent Wall, a sealing ring of a smaller transverse section than. that of said groove housed in said groove and adapted to engage fluidtight-ly the inner `side of said groove and the adjacent face of said plate facing toward said inner side of said groove so that said fluid pressure may act only on an annu-lar part of said adjacent face, means for supplying fiuid pressure to said groove to urge the opposit-e side of said annular part of said plate into sealing engagement with the adjacent part of the axial face of said rotor.

2. In a pump of the character described, a pump housing having front and rear walls, at least a rotor within said housing, a wear control plate in said housing associated with said rotor on at least one axial face thereof, said plate being interposed between said face of said rotor and the adjacent` Wa1l-oi:` saidV housing and havingthef edge thereof Xed to said housing, said plate being further resilient, elastic and capable of being deflected so thataitcan-'beurgedtowardfsaid fac-e of said rotor byy aiuidcpressure, .an annulargroove in said adjacentt'wall, a sealing ring of a smaller transverse section than that ofsaid groovehoused in said groove and adapted to engageruidtightly; the innerside of said groove and the adjacentsface ofsa-id plate facing toward said inner side of said groove sothat said uid pressure may act only on an annularpart of said adjacent face, said plate having, a hole therein one end thereof opening on the discharge sidel of said pump .and the other end opening into said groove whereby Huid pressure from the discharge side ofsaid pump may. be supplied to said groove-to urge thev opposite side `of said annular part of said plate into sealing engagement with the adjacent part of the axial face of said rotor.

3. In a p ump4 ofthe. gearV type, a pump housing having front and rear Walls, at least a pair of gear members in meshing engagement withA one another, a wear control platein said-.housing associated with said gear members on atleast one axial face of said gear members, said plate being interposed between said face of said gear members and, theV adjacent Wall of said housing: and having the edge thereof fixed to said housing,- said plate being further resilient, elastic and capableY of being deflected so that it can Aberurged toward said faceV of said rotor by a uid pressure, annular grooves in said adjacent wall coaxial With each of said gear members and communicating with eachother, a sealing ring of a smaller transverse section-than that of said grooves, housed in each of said grooves and adapted to engage iluidtightly the inner side of said grooves and theadjacent face of said plate facing toward said inner sideA ofl saidv grooves so that said iuid pressure mayact only on an annular part of said adjacent,V face, means for supplying fluid pressure to said grooves to urge the opposite side of said annular part of said'v plate into sealing engagementwith the adjacent part of the axial face of said gear members.

4.- In a pump of the gear type, a pump housing having front andfrear walls, at least a pair of gear members in meshing engagement with one another, a wear control plate infsaid housing associated with said gear members on at least one axial facefof said gear members, said plate being interposed between said face of said gear members and the adjacent wall of said housing, and having the edge thereof fixed to saidhousing, said plate being further resilient, elastic ande'apable of being deilected so that it can be urged. towardsaid face of said rotor by a uid pressure, annular grooves in said adjacent wall coaxial with'each of said gearA membersv andcommunicating withreach other, a sealing ring of a* srnaller'- transverse section than that of said groove, housed in each of said grooves andadaptedto engage il'uidtightly the inner side of said grooves and the adjacent face of said plate facing toward saidinner sideof said grooves'so 'that said fluid pressure mayact only on an annular part of said adjacent face, said plate having a hole therein one end thereof opening on the discharge side of said pump and the other end openingfinto saidv grooves-wherebyiluid pressure from the discharge sideof said pump,1 may be supplied between said plate and said Wall tourgerthe opposite side of said annular part of said plate'into sealing engagement with -the adjacent part of the axial face of vvsaid' gear members.

References Cited in the file of Ythis patent v UNITED STATES PATENTS 465,907 Whipple Dee. 29, 1'8-,91 1,470,030 Rona oct. 9,-v 19.123. 1,737,942 Pagel Dec. 3, 19.29 1,771,863 Schmidt a July 29; 1930 1,780,109y Berglund ..Y Oct. 28, 1930 1,879,136 Dubrovin Sept. y27, 1932 1,972,632 Patton Sept. 4,1934 2,044,873 Beust June 23, 1936v 2,058,817 rNorthey n Oct. 27, 1936 2,098,652 lBuckbee Nov. 9, 1937 `2,176,322 Barrett Oct. 17, 1939y 2,270,222 Rea. et al. Jan. 13, 1942 2,312,891 -Ferris Mar. 2, 1943 2,321,609 Marco Junev l5, 19,43 2,420,622 Roth et al May' 13, 1947

US267949A 1951-04-06 1952-01-24 Rotary pump Expired - Lifetime US2702509A (en)

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Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2809592A (en) * 1954-01-13 1957-10-15 Cessna Aircraft Co Rotary pump or motor
US2856860A (en) * 1955-08-03 1958-10-21 Mechanisms Company Fluid pressure transducer with end clearance control
US2870718A (en) * 1953-10-23 1959-01-27 Thompson Prod Inc Implement pump
US2876705A (en) * 1953-05-29 1959-03-10 Thompson Prod Inc Pressure loaded gear pump
US2923248A (en) * 1954-01-27 1960-02-02 New York Air Brake Co Pump
US2956512A (en) * 1957-05-02 1960-10-18 Robert W Brundage Hydraulic pump or motor
US2968251A (en) * 1953-07-15 1961-01-17 Eaton Mfg Co Internal gear pump
US3008425A (en) * 1960-06-13 1961-11-14 Chambers George Harold Gear pump seal
US3019737A (en) * 1960-02-12 1962-02-06 Thompson Ramo Wooldridge Inc Leaf spring seal for pumps
US3025796A (en) * 1955-10-03 1962-03-20 Dale O Miller Gear pump
US3050010A (en) * 1960-02-23 1962-08-21 Thompson Ramo Wooldridge Inc Pressure loaded pump
US3059584A (en) * 1960-01-13 1962-10-23 Sonic Eng Corp Rotary pumps and compressors
US3068804A (en) * 1960-03-21 1962-12-18 Thompson Ramo Wooldridge Inc Pressure loaded pump seal
DE1155339B (en) * 1956-09-06 1963-10-03 Bosch Gmbh Robert Zahnradfluessigkeitspumpe
US3131643A (en) * 1962-10-25 1964-05-05 New York Air Brake Co Engine
US3146716A (en) * 1961-12-26 1964-09-01 Allis Chalmers Mfg Co Fuel supplying mechanism
DE1185926B (en) * 1955-03-09 1965-01-21 Roper Ind Inc Gear pump or motor
US3171358A (en) * 1963-06-03 1965-03-02 Lear Siegler Inc Gear type pump
US3270680A (en) * 1964-12-17 1966-09-06 Kingston Products Corp Pressure loaded gear pump
US3280754A (en) * 1964-02-12 1966-10-25 New York Air Brake Co Engine
US3376824A (en) * 1965-07-01 1968-04-09 Turolla Marco Gear pump
US3473474A (en) * 1966-12-23 1969-10-21 Maag Zahnraeder & Maschinen Ag Sealing means for high pressure gear pump
US3834846A (en) * 1972-05-12 1974-09-10 Bosch Gmbh Robert Rotor supporting arrangement for a compressor
US3844694A (en) * 1971-10-07 1974-10-29 Daimler Benz Ag Rotary piston internal combustion engine, especially of trochoidal construction
US3876347A (en) * 1972-02-17 1975-04-08 Sperry Rand Corp Gear pump or motor with unitary flexible end seal plate
DE2555595A1 (en) * 1974-12-13 1976-06-16 Nippon Piston Ring Co Ltd Dry air rotary pump or compressor
DE2607444A1 (en) * 1975-02-26 1976-09-09 Nippon Piston Ring Co Ltd Dry air rotary pump or Compressor
US6527529B2 (en) * 2000-05-19 2003-03-04 Robert Bosch Gmbh Geared feed pump having a platelike cover element and an indented end cap
EP1333178A1 (en) * 2002-02-01 2003-08-06 Still Gmbh Hydraulic gearwheel machine
WO2018114934A1 (en) * 2016-12-21 2018-06-28 Robert Bosch Gmbh External gear pump for a waste heat recovery system

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US465907A (en) * 1891-12-29 Rotary steam-engine
US1470030A (en) * 1919-12-19 1923-10-09 Walter G E Rolaff Rotary compressor
US1737942A (en) * 1926-11-18 1929-12-03 Pagel Rotarypump Mfg Company Rotary fluid pump or motor
US1771863A (en) * 1927-06-03 1930-07-29 Patiag Patentverwertungs Und I Rotary pump
US1780109A (en) * 1927-05-11 1930-10-28 Vacuum Compressor Ab Rotary machine
US1879136A (en) * 1929-12-16 1932-09-27 Central Scientific Co Blower and vacuum pump
US1972632A (en) * 1931-01-05 1934-09-04 Commercial Shearing Thrust plate for pumps
US2044873A (en) * 1933-11-21 1936-06-23 Cecil J Beust Rotary compressor
US2058817A (en) * 1931-12-22 1936-10-27 Northey Rotary Engines Ltd Rotary internal combustion engine
US2098652A (en) * 1935-08-13 1937-11-09 Buckbee John Calvin Rotary pump
US2176322A (en) * 1937-06-28 1939-10-17 Gar Wood Ind Inc Fluid pump
US2270222A (en) * 1941-06-23 1942-01-13 Rea Fluid brake
US2312891A (en) * 1939-05-19 1943-03-02 Oilgear Co Hydrodynamic machine
US2321609A (en) * 1939-12-16 1943-06-15 Marco Company Rotary pump
US2420622A (en) * 1942-04-15 1947-05-13 Borg Warner Pump with pressure loaded bushing

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US465907A (en) * 1891-12-29 Rotary steam-engine
US1470030A (en) * 1919-12-19 1923-10-09 Walter G E Rolaff Rotary compressor
US1737942A (en) * 1926-11-18 1929-12-03 Pagel Rotarypump Mfg Company Rotary fluid pump or motor
US1780109A (en) * 1927-05-11 1930-10-28 Vacuum Compressor Ab Rotary machine
US1771863A (en) * 1927-06-03 1930-07-29 Patiag Patentverwertungs Und I Rotary pump
US1879136A (en) * 1929-12-16 1932-09-27 Central Scientific Co Blower and vacuum pump
US1972632A (en) * 1931-01-05 1934-09-04 Commercial Shearing Thrust plate for pumps
US2058817A (en) * 1931-12-22 1936-10-27 Northey Rotary Engines Ltd Rotary internal combustion engine
US2044873A (en) * 1933-11-21 1936-06-23 Cecil J Beust Rotary compressor
US2098652A (en) * 1935-08-13 1937-11-09 Buckbee John Calvin Rotary pump
US2176322A (en) * 1937-06-28 1939-10-17 Gar Wood Ind Inc Fluid pump
US2312891A (en) * 1939-05-19 1943-03-02 Oilgear Co Hydrodynamic machine
US2321609A (en) * 1939-12-16 1943-06-15 Marco Company Rotary pump
US2270222A (en) * 1941-06-23 1942-01-13 Rea Fluid brake
US2420622A (en) * 1942-04-15 1947-05-13 Borg Warner Pump with pressure loaded bushing

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2876705A (en) * 1953-05-29 1959-03-10 Thompson Prod Inc Pressure loaded gear pump
US2968251A (en) * 1953-07-15 1961-01-17 Eaton Mfg Co Internal gear pump
US2870718A (en) * 1953-10-23 1959-01-27 Thompson Prod Inc Implement pump
US2809592A (en) * 1954-01-13 1957-10-15 Cessna Aircraft Co Rotary pump or motor
US2923248A (en) * 1954-01-27 1960-02-02 New York Air Brake Co Pump
DE1185926B (en) * 1955-03-09 1965-01-21 Roper Ind Inc Gear pump or motor
US2856860A (en) * 1955-08-03 1958-10-21 Mechanisms Company Fluid pressure transducer with end clearance control
US3025796A (en) * 1955-10-03 1962-03-20 Dale O Miller Gear pump
DE1155339B (en) * 1956-09-06 1963-10-03 Bosch Gmbh Robert Zahnradfluessigkeitspumpe
US2956512A (en) * 1957-05-02 1960-10-18 Robert W Brundage Hydraulic pump or motor
US3059584A (en) * 1960-01-13 1962-10-23 Sonic Eng Corp Rotary pumps and compressors
US3019737A (en) * 1960-02-12 1962-02-06 Thompson Ramo Wooldridge Inc Leaf spring seal for pumps
US3050010A (en) * 1960-02-23 1962-08-21 Thompson Ramo Wooldridge Inc Pressure loaded pump
US3068804A (en) * 1960-03-21 1962-12-18 Thompson Ramo Wooldridge Inc Pressure loaded pump seal
US3008425A (en) * 1960-06-13 1961-11-14 Chambers George Harold Gear pump seal
US3146716A (en) * 1961-12-26 1964-09-01 Allis Chalmers Mfg Co Fuel supplying mechanism
US3131643A (en) * 1962-10-25 1964-05-05 New York Air Brake Co Engine
US3171358A (en) * 1963-06-03 1965-03-02 Lear Siegler Inc Gear type pump
US3280754A (en) * 1964-02-12 1966-10-25 New York Air Brake Co Engine
US3270680A (en) * 1964-12-17 1966-09-06 Kingston Products Corp Pressure loaded gear pump
US3376824A (en) * 1965-07-01 1968-04-09 Turolla Marco Gear pump
US3473474A (en) * 1966-12-23 1969-10-21 Maag Zahnraeder & Maschinen Ag Sealing means for high pressure gear pump
US3844694A (en) * 1971-10-07 1974-10-29 Daimler Benz Ag Rotary piston internal combustion engine, especially of trochoidal construction
US3876347A (en) * 1972-02-17 1975-04-08 Sperry Rand Corp Gear pump or motor with unitary flexible end seal plate
US3834846A (en) * 1972-05-12 1974-09-10 Bosch Gmbh Robert Rotor supporting arrangement for a compressor
DE2555595A1 (en) * 1974-12-13 1976-06-16 Nippon Piston Ring Co Ltd Dry air rotary pump or compressor
DE2607444A1 (en) * 1975-02-26 1976-09-09 Nippon Piston Ring Co Ltd Dry air rotary pump or Compressor
US6527529B2 (en) * 2000-05-19 2003-03-04 Robert Bosch Gmbh Geared feed pump having a platelike cover element and an indented end cap
EP1333178A1 (en) * 2002-02-01 2003-08-06 Still Gmbh Hydraulic gearwheel machine
WO2018114934A1 (en) * 2016-12-21 2018-06-28 Robert Bosch Gmbh External gear pump for a waste heat recovery system

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