US2064750A - Piston pump for the conveyance of liquids - Google Patents

Piston pump for the conveyance of liquids Download PDF

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Publication number
US2064750A
US2064750A US66522833A US2064750A US 2064750 A US2064750 A US 2064750A US 66522833 A US66522833 A US 66522833A US 2064750 A US2064750 A US 2064750A
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Prior art keywords
piston
pump
outlet
means
valve
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Expired - Lifetime
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Hurst Max
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Robert Bosch AG
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Robert Bosch GmbH
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M39/00Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/005Arrangements of fuel feed-pumps with respect to fuel injection apparatus

Description

Dec. 15, 1936. R T 2,064,750

PISTON PUMP FOR THE CONVEYANCE OF LIQUIDS Filed A ril 8, 1953 2 Sheets-Sheet 1 eozo 6 olna I r- I Dec. 15, 1936.

M. HURST PISTON PUMP FOR THE CONVEYANCE 0F LI QUIDS Filed April a, 1933 2 Sheets-Sheet 2 Patented Dec. 15, 1936 UNITED STATES rrs'ron rmur non 'rim comnucn Max use. Stutt a Robert Bosch Germany F LIQUIDS Germany, assirnor to Aktiengeeeilschaft, Stuttgart,

Application April 8 1933, No. 865,228 I InGermany April 23,1932

16 Claims. (euros-s1) The present invention relates to piston pumps for the conveyance of liquids and more especially for conveying fuel to the carbureter or the injection pump of an internal combustion engine,

in which the pump piston is driven by a driving means arranged outside the fuel-conveying spaces, and is controlled by at least one movable transmission member which acts indirectly or directly on the piston. The invention hasfor its object to construct the conveying pump in such a way that no air can enter through the place where the transmission member passes into the fuel-conveying chambers, so that a satisfactory and reliable operation of the internal combustion engine is ensured.

For this purpose, according to the invention, both sides of the piston are exposed to the liquid (fuel), and the arrangement of the pump is such that those chambers of the pump whose wall is traversed by a movable member of the drive acting from outside are permanently maintained by the liquid conveyed under a pressure corresponding substantially to the excess pressure in the conveying pipe.

Two examples of construction of the invention areshown in the drawings, in which:--

Figure 1 shows an injection pumping plant for Diesel engines having a conveying pump constructed in accordance with the invention.

Figure 2 shows the first example of construction of the conveying pump in longitudinal section on the line A-B of Fig. 1.

Figures 8, 4 and 5 show the same pump in different working positions, and in section on the line C-DE-F Of Fig 2. H

Figure 6 is a diagrammatic longitudinal section of the second example of construction of the conveying pump.

I is an injection pump of known construction having four separate pumps, the pump pistons 2 (Fig. 2) of which are lifted as usual by the camshaft 3 mounted in the casingof the injection pump through plunger or tappet rollers l and plungers 5. The injection pump draws fuel from a filter 6 arranged in advance of it, the

inlet side of which is connected through a pipe I with the pressure "side of a conveying pump 8. This latter draws fuel from the main storage receptacle 9 arranged below it. The conveying pump is flanged to one long side of the injection pump, and in such a way that it lies transverselyto its cam-shaft 3 (Fig. 2). The pump body III of the conveying pump projects with a tubular extension ll into the interior of the injection pump. A plunger I2 is guided in the extension II, and acts on the piston II of the conveying pump through a strong spring I! and a push-rod ll which passes through'into the pump body I0 from the outside. The piston is guided in a passage 23 inthe pump body 10 through the bottom 5 of which the push-rod It extends co-axially with the passage. The open end of this passage is closed in a liquid-tight manner by a screw-cap 24. At least one back pressure spring 16 acts on the piston i5 and has a tendency to press it 10 against the front end of the push-rod. The plunger l2 and the push-rod ll are pressed constantly against the driving cam II by a common spring ll bearing between the pump body and the outer head of the push-rod, and the cam 15 serves at the same time also for driving a pump piston 2 of the injection pump I. In the pump casing I! a suction valve l9 and a pressure valve 20 are arranged on the side of the piston remote from the push-rod (see Figs. 3-5). The 20 movable members of these valves are formed as plates, which without valve springs simply bear, on their sea owing to their own weight. A. passage 22 connects the outlet side of the pressure valve with the other side of the piston. 25

The conveying pump described works as follows:

On the rotation of the cam-shaft 3 of the injection pump the conveying pump 8 is simultaneously operated by the driving cam l8. Its 30 plunger i2 is moved by the driving cam against the action of the spring l1 and the piston spring it into the interior of the pump body ID, as is shown in Fig. 3 by feathered arrows. -The movement of'the plunger is at the same time trans- Y mitted by the push-rod M to the piston ii. In

this operation, fuel in the pump 'chamber'between the suction valve l9 and the pressure valve 20 is conveyed through the pressure valve 20 when the suction valve is closed. A part of 40 this fuel. fills at the same time through the passage 22 that chamber which is freed on the lower side of the piston. This chamber is smaller by the stroke volume of the push-rod than the quantity of fuel pumped through the pressure 45 valve. The quantity of fuel corresponding to this stroke volume is thus forced through the pump outlet into the pipe I leading to the filter 6. 0n the return stroke effected by the two springs l6 and H, the upper side of the piston draws fresh fuel from the main storage container 9 through the suction valve l9, whilst the lower side of the piston forces the quantity of fuel received-in its pump chamber on the preceding stroke by "the 6 passage 22 through the outlet into the pipe 1, as is shownby the unfeathered arrows in Fig. 4.

If the quantity of fuel delivered by the conveying pump to its outlet in a certain period of time is greater than the fuel consumption of the internal combustion engine (for example, when running idle), the pressure then increases behind the pressure valve 20, and thus also on the lower side of the piston, until the back pressureexerted on the rear face of the piston l5 exceeds the pressure of the piston spring I6. As soon as this condition is reached, the spring l6 cannot fully return the piston l5 any longer, as is shown for example in Fig. 5. The quantity conveyed by the conveying pump thus adapts itself automatically to the fuel consumption of the engine.

, The spring I3 provided between the head of the push-rod l4 and the bottom of the plunger l2 serves as a buffer, and is of such strength that it cannot be compressed during normal working. This spring thus prevents the transmission of shocks and the like to the push-rod ll and so to the piston l5.

In the second form of conveying pump, shown in Fig. 6, the piston i5 works through two spring-loaded pressure valves 20 and II, the first of which is arranged in the piston coaxially with the suction valve l9, which is also spring-loaded, and with the push-rod ll. The push-rod is here made integral with the piston.

The mode of action of this pump is essentially the same as that of the conveying pump first described. On the downward movement of the piston, which is eifected by the back pressure spring l6, fuel is drawn through the valve I! from the upper side of the piston l5, whilst the fuel on the lower side of the piston is forced away through the second pressure valve 2| arranged in the pump body II. The pressure valve 2| provided in the piston is at the same time closed. As soon as the driving cam ll acts on the head of the push-rod M, the piston is moved against the pressure of the spring I into the interior of the pump. During this action the suction valve it remains closed; whilst the fuel in front or the piston is pressed through the first pressure valve arranged in the piston and into the chamber below the piston.

It is common to both constructions of the conveying pump that on-the side of the piston I! towards the push-rod I 4 an excess pressure relative to the external surroundings of the pump prevails both on the outward stroke and also on the inward stroke. In this way air is prevented from penetrating along the push-rod into the conveying pump.

The second pressure valve 2| provided in Fig. i may also be omitted without anything being essentially altered in the action of the pump.

I declare that what I claim is: I

l. A piston pump for conveying liquids comprisinga pump casing having an inlet passage and an outlet passage, a piston reciprocable in said casing, driving means adapted to loosely engage and positively displace said piston in one direction only, resilient means for displacing the piston in the other direction, a suction valve controlling said inlet passage and communicating with that side of the piston remote from the driving means and a discharge valve communicating at all times with the outlet passage and with the side of the piston adiacent to the driving means, said resilient means yielding to permit said piston to become substantially inoperative when the pressure created by said pump reaches a predetermined degree.

2. A piston pump for conveying liquids comprising a pump casing having an inlet passage and an outlet passage, a piston reciprocable in said casing, driving means adapted positively to. displace said piston in one direction only, a transmission member located between said driving means and the piston and extending into said casing to loosely engage one side of the piston, resilient means for displacing the piston in the other direction, a suction valve controlling the inlet passage and communicating with that side of the piston remote from the driving means and a discharge valve communicating with the outlet passage and with that side of the piston engaged by said transmission member, said resilient means yielding to permit said piston to become substantially inoperative when the pressure created by said pump reaches a predetermined degree.

3. A piston pump for conveying liquids comprising a pump casing having an inlet passage and an outlet passage, a piston reciprocable in said casing, driving means adapted positively to displace said piston in one direction only, a transmission member located between said driving means and the piston and extending into said casing to loosely engage one side of the piston, means for displacing the piston non-positively in the other direction, a suction valve controlling the inlet passage and communicating with that side of the piston remote from the driving means and a discharge valve-communicating with the outlet passage and with that side of the piston engaged by said transmission member, the means for displacing the piston non-positively yielding to permit said piston to become substantially inoperative when the pressure created by said pump reaches a predetermined degree.

4. A piston pump for conveying liquids comprising a pump casing having an inlet passage and an outlet passage, a piston reciprocable in said casing, driving means adapted positively to displace said piston in one direction only, a transmission member located between said driving means and the piston and extending into said casing to loosely engageone side 'of the piston. loading means opposed to said driving means and adapted to cause displacement of the piston in the other direction, a suction valve controlling the inlet passage and communicating with that side of the piston remote from the driving means and a discharge valve communicating with the outlet passage and with that side of the piston engaged by said transmission member, said loading means yielding to permit said piston to become substantially inoperative when the pressure created by said pump reaches a predetermined d gree.

5. A piston pump for conveying liquids com- Drising'a pump casing having an inlet e and an outlet passage, a piston reciprocable in said casing, driving means adapted positively'to displace said piston in one direction only, a transmission member located between said driving means and the piston and extending into said casing to engage oneside oifithe piston, a resilient buifer interposed between said transmission member and said driving means, a suction valve controllingthe inlet e and communicating with that side of the piston remote from the driving means and a discharge valve communicating with the outlet passage and with that side of, the piston engaged by said transmission member.

6. A piston pump 'for conveying liquids comprising a. pump casing having an inlet passage and an outlet passage, a piston reciprocable in said casing, driving means reciprocable through 5 a wall of said pump casing and adapted positively to displace said piston .in one direction only,

resilient means for displacing the'piston in the other direction, a suction valve communicating with the induction side of the piston'and a dis-- 7 10 charge valve mounted on the piston and comv and an outlet passage, a piston reciprocable in 1 20 said casing, drivingv means adapted positively to displace said piston-inonedirection only, a transmission member located betweensaid driving means and the piston and extending into said casing to engage one side of the piston, resilient 25 means for displacing the piston in the other direction, a suction valve controlling the inlet passage and communicating with that side ,of the piston remote from the-driving means and a discharge valve mounted onthe piston and com- 30 municating atall times with the outlet passage and with that-side of the piston engaged by-said transmission member, said resilient means yielding to permit said piston to become substantially inoperative when the pressure created by said 35 pump reaches a predetermined degree.

8. A pump comprising a pump casing having an inlet and a discharge, valves controlling said inlet and discharge, a piston reciprocable in said casing, said inlet communicating with one side of 4 saidpiston and said discharge communicating with both sides oi said piston, resilient means for moving the piston in one direction, and means including a push rod reciprocable through a wall of said pump casing and loosely connected to the 45 piston for moving it in the opposite direction, said resilient means yielding to permit said piston to become substantially inoperative when the pressure created by said pump reaches a predetermined degree. I 50 9. A piston pump for conveying liquids comprising a pump casing having an inlet passage and an outlet passage, a piston reciprocable in said casing, driving means adapted positively to displace said piston in one direction only, a trans- 55 mission member located between said driving means and said piston and extending into said casing to loosely engage one side of said piston, resilient means urging said transmission mem-v ber into contact with said driving means, resilient means for displacing the piston in the other direction, both of said resilient means tending to move said piston and transmission member in the same direction, a suction valve controlling the inlet passage and communicatingwith that side 65 of the piston remote from the driving means, and a discharge valve communicating with the outlet passage and with that side of the piston engaged by said transmission member.

10. In a pump structure, incombination, a 70 cylinder having an inlet adapted to be connected with a source of supply and an outlet adapted to be connected with a pointof ;u'se, check valves for said inlet and outlet, a. piston reciprocable in said cylinder and adapted to discharge liquid 75 therefrom, resilient means constantly urging said piston in a direction to discharge fluid through said outlet, and a plunger reciprocable independently of said piston projecting into said cylinder, said plunger adapted to move said piston against the urge of said resilient means when in contact 5 with said piston and when moving in opposition, to said resilient means, and being of a size suf ficient to displace a material amount of fluid from said cylinder through said outlet during movement toward and when tree of contact with I said piston.

11. In a pump structure,:-in combination, a cylinder having an inlet adjacent one end and an outlet adjacent the other end, a piston re-.- ciprocable between said inlet and outlet, spring means constantly urging saidpiston'in a direction to discharge fluid through said outlet, a check valve in said inletpreventing reversal oi flow therethrough, a bypass between opposite ends of said piston and communicating with said outlet, a check valve in said bypass opening toward said outlet, and means at the outlet end of said piston movable relative thereto for moving said piston against the force of said spring means and reducing the eiiective cross sectional area thereof subject to the pressure of fluid at said end, whereby movement of said piston toward the inlet end of said cylinder will displace a greater volume of fluidthrough 'said bypass to the outlet end of said cylinder than the volmile simultaneously created at said outlet end by said movement of said piston.

12. In a pump structure, in combination, a cylinder having an inlet adjacent one end and an outlet adjacent the other end, a piston reciprocable between .said inlet and outlet, spring means constantly urging said piston in a direction to discharge fluid through said outlet, 9,

check valve in said inlet preventing reversal of flow therethrough, a bypassbetween opposite 40 ends of said piston and communicating with said outlet, a check valve in said bypass permitting flow therethrough only in'thej-direction of said outlet, and means at the outlet end of said piston movable relative thereto for moving said piston against the force of said spring means, said means including a member reducing the effective cross sectional area of said piston subject to the pressure of fluid at said end, whereby movement of said piston toward'the inlet end of said cylinder will displace a greater volume ofjfluid through said bypass to the outlet end of said cylinder than the volume simultaneously created at said outlet end by said movement of said piston.

13. In a pump structure, in combination, a cylinder having an inletadjacent one end and an outlet adjacent the other end, a piston reciprocable between. said inlet and outlet, spring means constantly urging said piston in a direction to dischargefluid through said outlet, a check valve in said inlet preventing reversal of fiow therethrough, a bypass in said piston between opposite ends thereof and-communicating with said outlet, a check valve in saidbypass permitting flow therethrough only in the direction of said outlet, driving means movable independently of said pistonfor moving said piston against the action of 'said spring means, and a transmission member between said driving means and said piston reducing the effective cross-sectional area of the. outlet end of said piston whereby movement of said piston toward the inlet end ofsaid cylinder will displace a greater volume'of fluid through said bypass to the outlet endoi' said'cylinder than the volume simultaneouslycreated at said outlet end by said movement of said piston.

14. In a pump structure, in combination, a cylinder having an inlet adjacent one end and an outlet adjacent the other end, a piston reciprocable between said inlet and outlet, means urging said piston toward the outlet end of said cylinder, a check valve in saidinlet preventing reversal of flow therethrough, a bypass between opposite ends of said piston and communicating with said outlet, a check valve in said bypass opening toward said outlet, and a member at the outlet end of said piston 'engageable therewith to move it against the force of said means and reducing the efiective cross-sectional area of said piston subject to the pressure of fluid at said end, whereby movement of said piston toward the inlet end of said' cylinder will displace'a greater volume of fluid through said bypass to the outlet end of said cylinder than the volume simultaneously created atsaid outlet end by said movement of said piston, said member being movable independently of said piston whereby when it is moving relative to and toward said piston it acts to displace fluid from said outlet end of said cylinder.

15. In a pump structure, in combination, a housing providing a cylinder having an inlet adjacent one end and an outlet adjacent the other end, a piston reciprocable between said inlet and outlet, spring means constantly urging said piston in a direction to discharge fluid through said outlet, a check'valve in said inlet preventing reversal of flow therethrough, a bypass in said housing between opposite ends of said piston and communicating .with said outlet, a check valve in said bypass opening toward said outlet, a member reciprocable independently of said piston engageable therewith for moving it in one direction against the action of said spring means, said member reducing the effective cross sectional area of the outlet end of said piston whereby movement of said piston toward the inlet end of said cylinder will displace a greater volume of fluid through said bypass to the outlet end of said cylinder than the volume simultaneously created at said outlet end by said movement of said piston, and means for positively moving said memberin at least one direction. 1

16. In a pump structure, in combination, a cylinder having an inlet and an outlet, a check valve for said inlet, a piston reciprocable in said cylinder and adapted to discharge liquid therefrom, resilient means constantly urging said piston in a direction to discharge fluid from said cylinder through said outlet, a plunger of a diameter diflerent from said piston projecting into said cylinder and adapted to abut and move said piston against the action of said resilient means, said plunger being reciprocable independently of said piston and adapted to displace a material amount of liquid from said cylinder through said outlet when moving toward abutting relation with respect to said piston, and means including a check valve opening toward said outlet for bypassing fluid in said cylinder from the inlet thereof to the outlet thereof.

MAX HURST.

US2064750A 1932-04-23 1933-04-08 Piston pump for the conveyance of liquids Expired - Lifetime US2064750A (en)

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Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2915303A (en) * 1955-03-30 1959-12-01 Bendix Aviat Corp Dashpot
US2936712A (en) * 1958-01-20 1960-05-17 Deere & Co Variable displacement pump
US2950684A (en) * 1958-01-06 1960-08-30 Dole Valve Co Fluid pump
US2982466A (en) * 1958-11-21 1961-05-02 Westinghouse Air Brake Co Compressor unloading apparatus
US2987003A (en) * 1958-01-08 1961-06-06 Deere & Co Hydraulic pump system
US3002462A (en) * 1957-08-13 1961-10-03 Racine Hydraulics & Machinery Fluid translating apparatus
US3006148A (en) * 1958-10-06 1961-10-31 Gen Motors Corp Transmission pump system
US3016843A (en) * 1957-05-27 1962-01-16 Holley Carburetor Co Pumps
US3028908A (en) * 1958-01-22 1962-04-10 Gen Thermique Procedes Brola S Fuel burning system having an improved ignition arrangement
US3095824A (en) * 1960-06-13 1963-07-02 Gen Motors Corp Fuel pump drive
US3106168A (en) * 1959-09-17 1963-10-08 Gen Motors Corp Fuel pump drive
US3118381A (en) * 1964-01-21 figures
US3247798A (en) * 1962-05-16 1966-04-26 Nat Tank Co Method and means for operating a pumping oil well
US3259069A (en) * 1963-09-20 1966-07-05 Gen Motors Corp Windshield washer pump
US3259076A (en) * 1960-02-05 1966-07-05 Borg Warner Variable capacity fuel pump
US3301195A (en) * 1964-06-01 1967-01-31 Gen Motors Corp Reciprocating pump with full spring drive cycle
US3306211A (en) * 1964-03-16 1967-02-28 Munchner Motorzubehor G M B H Piston pumps
US3338172A (en) * 1965-03-30 1967-08-29 Bosch Gmbh Robert Lever actuated fuel supply pump, particularly for internal combustion engines
US3655296A (en) * 1969-07-18 1972-04-11 Dems Engineering Co Liquid pump
US3712758A (en) * 1970-09-10 1973-01-23 Int Harvester Co Variable displacement pump
US4019395A (en) * 1975-07-07 1977-04-26 Graco Inc. Piston drive assembly
US4021153A (en) * 1975-03-05 1977-05-03 Jean Cloup Liquid metering pumps
US4067666A (en) * 1976-07-19 1978-01-10 Whiteman Manufacturing Company Concrete pumping apparatus
US4098560A (en) * 1974-06-21 1978-07-04 Physics International Company Fuel injection pumps for internal combustion engines
US4141675A (en) * 1975-12-22 1979-02-27 Physics International Company Gas-actuated fuel pump wherein the pump piston is driven by a spring
WO1981001176A1 (en) * 1979-10-18 1981-04-30 Caterpillar Tractor Co Single acting piston pump
US4462302A (en) * 1980-09-27 1984-07-31 Barmag Barmer Maschinenfabrik Ag Motor fuel feed pump
DE3308697A1 (en) * 1983-03-11 1984-09-13 Kienzle Apparate Gmbh Piston pump
US4515530A (en) * 1982-11-23 1985-05-07 Wabco Westinghouse Fahrzeugbremsen Gmbh Disabling arrangement for a reciprocating piston compressor
US4619592A (en) * 1984-03-05 1986-10-28 Bender Fredrick L Pumping system having a main pump and a plurality of selectively operable subsidiary pumps
US4671743A (en) * 1979-06-20 1987-06-09 Hydrowatt Systems Limted Piston pump
US5201174A (en) * 1991-12-02 1993-04-13 Deere & Company Auxiliary hydraulic pump system
WO1996038662A1 (en) * 1995-06-02 1996-12-05 Stanadyne Automotive Corp. Reciprocating fuel pump with intermittent transfer pump
US7318416B1 (en) 2005-04-07 2008-01-15 Stewart Howard C Liquid fuel pump
US20090226332A1 (en) * 2006-10-31 2009-09-10 Humphrey Products Company Pump with linear actuator
CN102734013A (en) * 2012-06-19 2012-10-17 浙江大学 Gasoline supplying device for motorcycle
US8794266B1 (en) 2011-10-18 2014-08-05 Humphrey Products Company Cam actuated valve assembly with manual and electric activation

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118381A (en) * 1964-01-21 figures
US2915303A (en) * 1955-03-30 1959-12-01 Bendix Aviat Corp Dashpot
US3016843A (en) * 1957-05-27 1962-01-16 Holley Carburetor Co Pumps
US3002462A (en) * 1957-08-13 1961-10-03 Racine Hydraulics & Machinery Fluid translating apparatus
US2950684A (en) * 1958-01-06 1960-08-30 Dole Valve Co Fluid pump
US2987003A (en) * 1958-01-08 1961-06-06 Deere & Co Hydraulic pump system
US2936712A (en) * 1958-01-20 1960-05-17 Deere & Co Variable displacement pump
US3028908A (en) * 1958-01-22 1962-04-10 Gen Thermique Procedes Brola S Fuel burning system having an improved ignition arrangement
US3006148A (en) * 1958-10-06 1961-10-31 Gen Motors Corp Transmission pump system
US2982466A (en) * 1958-11-21 1961-05-02 Westinghouse Air Brake Co Compressor unloading apparatus
US3106168A (en) * 1959-09-17 1963-10-08 Gen Motors Corp Fuel pump drive
US3259076A (en) * 1960-02-05 1966-07-05 Borg Warner Variable capacity fuel pump
US3095824A (en) * 1960-06-13 1963-07-02 Gen Motors Corp Fuel pump drive
US3247798A (en) * 1962-05-16 1966-04-26 Nat Tank Co Method and means for operating a pumping oil well
US3259069A (en) * 1963-09-20 1966-07-05 Gen Motors Corp Windshield washer pump
US3306211A (en) * 1964-03-16 1967-02-28 Munchner Motorzubehor G M B H Piston pumps
US3301195A (en) * 1964-06-01 1967-01-31 Gen Motors Corp Reciprocating pump with full spring drive cycle
US3338172A (en) * 1965-03-30 1967-08-29 Bosch Gmbh Robert Lever actuated fuel supply pump, particularly for internal combustion engines
US3655296A (en) * 1969-07-18 1972-04-11 Dems Engineering Co Liquid pump
US3712758A (en) * 1970-09-10 1973-01-23 Int Harvester Co Variable displacement pump
US4098560A (en) * 1974-06-21 1978-07-04 Physics International Company Fuel injection pumps for internal combustion engines
US4021153A (en) * 1975-03-05 1977-05-03 Jean Cloup Liquid metering pumps
US4019395A (en) * 1975-07-07 1977-04-26 Graco Inc. Piston drive assembly
US4141675A (en) * 1975-12-22 1979-02-27 Physics International Company Gas-actuated fuel pump wherein the pump piston is driven by a spring
US4067666A (en) * 1976-07-19 1978-01-10 Whiteman Manufacturing Company Concrete pumping apparatus
US4671743A (en) * 1979-06-20 1987-06-09 Hydrowatt Systems Limted Piston pump
WO1981001176A1 (en) * 1979-10-18 1981-04-30 Caterpillar Tractor Co Single acting piston pump
US4462302A (en) * 1980-09-27 1984-07-31 Barmag Barmer Maschinenfabrik Ag Motor fuel feed pump
US4515530A (en) * 1982-11-23 1985-05-07 Wabco Westinghouse Fahrzeugbremsen Gmbh Disabling arrangement for a reciprocating piston compressor
DE3308697A1 (en) * 1983-03-11 1984-09-13 Kienzle Apparate Gmbh Piston pump
US4619592A (en) * 1984-03-05 1986-10-28 Bender Fredrick L Pumping system having a main pump and a plurality of selectively operable subsidiary pumps
US5201174A (en) * 1991-12-02 1993-04-13 Deere & Company Auxiliary hydraulic pump system
WO1996038662A1 (en) * 1995-06-02 1996-12-05 Stanadyne Automotive Corp. Reciprocating fuel pump with intermittent transfer pump
US5688110A (en) * 1995-06-02 1997-11-18 Stanadyne Automotive Corp. Fuel pump arrangement having cam driven low and high pressure reciprocating plunger pump units
US5888054A (en) * 1995-06-02 1999-03-30 Stanadyne Automotive Corp. Fuel pump having dual profile cam ring for driving low and high pressure reciprocating plungers
US7318416B1 (en) 2005-04-07 2008-01-15 Stewart Howard C Liquid fuel pump
US20090226332A1 (en) * 2006-10-31 2009-09-10 Humphrey Products Company Pump with linear actuator
US8186978B2 (en) * 2006-10-31 2012-05-29 Humphrey Products Company Pump with linear actuator
US8794266B1 (en) 2011-10-18 2014-08-05 Humphrey Products Company Cam actuated valve assembly with manual and electric activation
CN102734013A (en) * 2012-06-19 2012-10-17 浙江大学 Gasoline supplying device for motorcycle

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