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US20080008605A1 - Transfer pump with several pistons - Google Patents

Transfer pump with several pistons Download PDF

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Publication number
US20080008605A1
US20080008605A1 US11/819,836 US81983607A US2008008605A1 US 20080008605 A1 US20080008605 A1 US 20080008605A1 US 81983607 A US81983607 A US 81983607A US 2008008605 A1 US2008008605 A1 US 2008008605A1
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US
United States
Prior art keywords
pistons
cam
pump according
actuated
lobe
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
Application number
US11/819,836
Inventor
Philippe Bauer
David Humblot
Eric Meunier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Automotive Hydraulics SA
Original Assignee
Siemens Automotive Hydraulics SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Automotive Hydraulics SA filed Critical Siemens Automotive Hydraulics SA
Assigned to SIEMENS AUTOMOTIVE HYDRAULICS SA reassignment SIEMENS AUTOMOTIVE HYDRAULICS SA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAUER, PHILIPPE, MEUNIER, ERIC, HUMBLOT, DAVID
Assigned to SIEMENS AUTOMOTIVE HYDRAULICS SA reassignment SIEMENS AUTOMOTIVE HYDRAULICS SA CORRECT RECORDATION OF THE PATENT APPLICATION SERIAL NUMBER 11/819,839 RECORDED ON JULY 30, 2007, AT REEL 019621, FRAME 0029, NOTING THAT ERROR IS ON THE PART OF THE UNDERSIGNED. Assignors: BAUER, PHILIPPE, MEUNIER, ERIC, HUMBLOT, DAVID
Publication of US20080008605A1 publication Critical patent/US20080008605A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
    • F04B45/02—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having bellows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
    • F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
    • F02M59/102—Mechanical drive, e.g. tappets or cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/442—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston means preventing fuel leakage around pump plunger, e.g. fluid barriers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/084—Machines, pumps, or pumping installations having flexible working members having tubular flexible members the tubular member being deformed by stretching or distortion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/08—Machines, pumps, or pumping installations having flexible working members having tubular flexible members
    • F04B43/10—Pumps having fluid drive
    • F04B43/107—Pumps having fluid drive the fluid being actuated directly by a piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for

Definitions

  • This invention has as its object a pump of the type called a transfer pump, i.e., of the type that comprises a moving part that pumps an aggressive liquid such as automotive fuel, whereby this moving part is driven by an alternating movement by the oil that is pumped by a hydraulic pump.
  • a transfer pump i.e., of the type that comprises a moving part that pumps an aggressive liquid such as automotive fuel, whereby this moving part is driven by an alternating movement by the oil that is pumped by a hydraulic pump.
  • the travel of the piston should be increased or the diameter should be increased. If the travel is increased, the accelerations are high; if the diameter is increased, the force upon contact with the cam that drives the piston becomes too significant.
  • These electronic control means are in general solenoid valves that are controlled by the engine monitoring computer.
  • the transfer pump according to the invention is of the type in which the moving part for pumping is a metal bellows that is alternately filled with and emptied of hydraulic liquid at high pressure, whereby the amount of fuel allowed into the chamber in which said bellows moves is determined, upstream, by a solenoid valve that is driven by the computer for monitoring the engine, characterized by the fact that it comprises at least two pumping units (bellows/piston) that are supplied by a single intake system, common to the two units.
  • This invention can also comprise all or part of the following arrangements:
  • FIG. 1 a diagrammatic view of a first embodiment of the invention.
  • FIG. 2 a variant of FIG. 1 .
  • FIG. 3 a perspective view illustrating a pump according to FIG. 1 .
  • FIG. 4 a diagrammatic view of a variant embodiment of FIGS. 1 and 2 with “n” pistons.
  • FIG. 5 a diagrammatic view of a second embodiment of the invention.
  • the pump according to the invention comprises two pistons 1 a and 1 b that are driven by two cams 2 a and 2 b that are parallel and carried by a shaft 3 .
  • Each cam 2 a and 2 b comprises three lobes, placed at 120° C. from one another (as is shown in FIG. 3 ).
  • each piston 1 a and 1 b moves hydraulic liquid inside a bellows 4 a, 4 b, which extends and retracts in a chamber 5 a, 5 b.
  • the inside of the bellows 4 a, 4 b receives hydraulic liquid that is put under high pressure when the piston 1 rises, high pressure that is communicated to the fuel that is found in the chambers 5 a, 5 b.
  • the fuel is allowed into the two chambers 5 a, 5 b by means of a single supply circuit 6 that comprises two branches 6 a, 6 b.
  • the supply circuit 6 is connected by the orifice 7 to the tank by way of a solenoid valve 8 that measures the amount of fuel that can be introduced into the chambers 5 a and 5 b.
  • Two nonreturn valves 7 a, 7 b allow the fuel that is fed via the hose 6 to penetrate the chambers 5 a, 5 b, and two nonreturn valves 9 a, 9 b allow the fuel that is fed at high pressure via the bellows 4 a, 4 b to flow into the single conveyor duct 10 toward the conveyor orifice 11 .
  • the cams 2 a and 2 b are offset angularly by 60°.
  • the conveyor circuit is common to two pistons 1 a and 1 b, but the invention is not limited to this particular embodiment: it is possible to use a conveyor circuit 10 a and 10 b for each piston as is illustrated in FIG. 2 in which the same elements bear the same references.
  • FIG. 4 illustrates a variant embodiment in which the same elements bear the same references.
  • conveyor circuit 10 that is common to all “n” pistons, as in the case of FIG. 1 ; but it would be possible to use a conveyor circuit ( 10 a, 10 b . . . 10 n ) for each piston, as in the case of FIG. 2 .
  • an additional piston 1 m, . . . is shown symbolically by the branching 6 m of the duct 6 and by being connected at 10 m to the conveyor duct 10 .
  • the cams are cams with three lobes arranged at 120° from one another, but it is necessary to note that the invention is not limited to this particular example: the cam 2 can comprise one or more lobes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)

Abstract

Transfer pump of the type in which the moving part for pumping is a bellows (4) that is alternately filled with and emptied of hydraulic liquid at high pressure by a piston (1) that is driven by a cam (2), whereby the amount of fuel allowed into the chamber (5) into which the bellows (4) moves is determined, upstream, by a solenoid valve (8) that is driven by the computer for monitoring the engine, characterized by the fact that it comprises at least two pumping units (piston 1/bellows 4) that are supplied by a single intake system (6) that is common to the units on which the flow-monitoring solenoid valve (8) is placed and that have a conveyor circuit (10) that may be unique and common, or specific to each pumping unit.

Description

  • This invention has as its object a pump of the type called a transfer pump, i.e., of the type that comprises a moving part that pumps an aggressive liquid such as automotive fuel, whereby this moving part is driven by an alternating movement by the oil that is pumped by a hydraulic pump.
  • It is known to use a hydraulic pump with a single piston, a so-called single-piston pump, to supply the injectors of an engine with fuel at high pressure.
  • A pump of this type is described in the patent U.S. Pat. No. 1,696,825 of Dec. 25, 1928, as well as in the patent application Ser. No. 06/02,594 of Mar. 24, 2006, in the name of the applicant.
  • The flow rate provided by a single-piston pump, however, has proven inadequate for high capacities.
  • Actually, in practice, it turns out that there is a maximum limit of the capacity of the single-piston pumps, a limit that is approximately a bit more than 1 cc per turn.
  • To increase this capacity, the travel of the piston should be increased or the diameter should be increased. If the travel is increased, the accelerations are high; if the diameter is increased, the force upon contact with the cam that drives the piston becomes too significant.
  • The use of two single-piston pumps is therefore proposed, but it then is necessary to double the electronic control means, which is suitable for a prototype but is not economically suitable for the very large-scale production (2,000 single-piston pumps with 2,000 electronic control means are necessary for 1,000 engines per day).
  • These electronic control means are in general solenoid valves that are controlled by the engine monitoring computer.
  • The transfer pump according to the invention is of the type in which the moving part for pumping is a metal bellows that is alternately filled with and emptied of hydraulic liquid at high pressure, whereby the amount of fuel allowed into the chamber in which said bellows moves is determined, upstream, by a solenoid valve that is driven by the computer for monitoring the engine, characterized by the fact that it comprises at least two pumping units (bellows/piston) that are supplied by a single intake system, common to the two units.
  • This invention can also comprise all or part of the following arrangements:
      • a. The conveyor circuit is common to pumping units;
      • b. The pump comprises two pistons, whereby each piston is actuated by a cam, whereby the two cams are carried in parallel by a camshaft and are angularly offset by 60°;
      • c. The pump comprises “n” pistons, whereby each piston is actuated by a cam, whereby the “n” cams are carried parallel to one another by a camshaft and are angularly offset;
      • d. The pump comprises a single cam and at least two pistons placed radially around the cam;
      • e. The pump comprises two pistons that are placed in a V at 60° C. from one another.
  • By way of nonlimiting examples and to facilitate the understanding of the invention, there have been shown in the accompanying drawings:
  • FIG. 1, a diagrammatic view of a first embodiment of the invention.
  • FIG. 2, a variant of FIG. 1.
  • FIG. 3, a perspective view illustrating a pump according to FIG. 1.
  • FIG. 4, a diagrammatic view of a variant embodiment of FIGS. 1 and 2 with “n” pistons.
  • FIG. 5, a diagrammatic view of a second embodiment of the invention.
    •
  • By referring to FIGS. 1 and 2, it is seen that the pump according to the invention comprises two pistons 1 a and 1 b that are driven by two cams 2 a and 2 b that are parallel and carried by a shaft 3.
  • Each cam 2 a and 2 b comprises three lobes, placed at 120° C. from one another (as is shown in FIG. 3).
  • In a way that is known in the art, each piston 1 a and 1 b moves hydraulic liquid inside a bellows 4 a, 4 b, which extends and retracts in a chamber 5 a, 5 b. The inside of the bellows 4 a, 4 b receives hydraulic liquid that is put under high pressure when the piston 1 rises, high pressure that is communicated to the fuel that is found in the chambers 5 a, 5 b.
  • According to this invention, the fuel is allowed into the two chambers 5 a, 5 b by means of a single supply circuit 6 that comprises two branches 6 a, 6 b.
  • The supply circuit 6 is connected by the orifice 7 to the tank by way of a solenoid valve 8 that measures the amount of fuel that can be introduced into the chambers 5 a and 5 b.
  • Two nonreturn valves 7 a, 7 b allow the fuel that is fed via the hose 6 to penetrate the chambers 5 a, 5 b, and two nonreturn valves 9 a, 9 b allow the fuel that is fed at high pressure via the bellows 4 a, 4 b to flow into the single conveyor duct 10 toward the conveyor orifice 11.
  • Preferably, the cams 2 a and 2 b are offset angularly by 60°.
  • This arrangement provides the following advantages:
      • As there is a single supply and conveyor circuit, there are fewer components than with two standard single-piston pumps.
      • In particular, there is only a single solenoid valve 8 for monitoring the amount of fuel sent to the engine.
      • The force exerted by the pistons on the camshaft 3 is less than the equivalent capacity that would be present if there were a single piston.
      • The angular offset of the two cams 2 ensures better progressiveness of the pressurized flow toward the injection rail and makes it possible to reduce the variations of the torque on the camshaft.
  • In the embodiment shown in FIG. 1, the conveyor circuit is common to two pistons 1 a and 1 b, but the invention is not limited to this particular embodiment: it is possible to use a conveyor circuit 10 a and 10 b for each piston as is illustrated in FIG. 2 in which the same elements bear the same references.
  • FIG. 4 illustrates a variant embodiment in which the same elements bear the same references.
  • According to this variant, there are more than two pistons 1 a, 1 b . . . 1 n each driven by a cam 2 a, 2 b . . . 2 n, whereby these cams are parallel to one another and carried by the same camshaft 3.
  • There is a conveyor circuit 10 that is common to all “n” pistons, as in the case of FIG. 1; but it would be possible to use a conveyor circuit (10 a, 10 b . . . 10 n) for each piston, as in the case of FIG. 2.
  • The only difference with the pump of FIG. 1 is that there is only a single cam 1 (whereby the camshaft 3 is drawn symbolically) to drive the two pistons 1 a and 1 b, but the latter are placed in a V, their axes being arranged at 60°.
  • The same advantages as in the example of FIG. 2 are obtained, whereby the unit is a bit more compact.
  • In this same FIG. 5, an additional piston 1 m, . . . is shown symbolically by the branching 6 m of the duct 6 and by being connected at 10 m to the conveyor duct 10.
  • The purpose of this representation is to demonstrate that it is possible to use, in a radial manner, a number “m” of pistons, around the cam 2.
  • In all of the examples that are shown, the cams are cams with three lobes arranged at 120° from one another, but it is necessary to note that the invention is not limited to this particular example: the cam 2 can comprise one or more lobes.

Claims (13)

1. Transfer pump of the type in which the moving part for pumping is a bellows (4) that is alternately filled with and emptied of hydraulic liquid at high pressure by a piston (1) that is driven by a cam (2), whereby the amount of fuel allowed into the chamber (5) into which the bellows (4) moves is determined, upstream, by a solenoid valve (8) that is driven by the computer for monitoring the engine, characterized by the fact that it comprises at least two pumping units (piston 1/bellows 4) that are supplied by a single intake system (6) that is common to the units on which the flow-monitoring solenoid valve (8) is placed and that has a conveyor circuit (10) that may be unique and common, or specific to each pumping unit.
2. Pump according to claim 1, wherein the pistons (1) are actuated by at least one single-lobe or multi-lobe cam (2).
3. Pump according to claim 2, comprising several pistons (1 a, 1 b . . . 1 n) that drive bellows (4 a, 4 b . . . 4 n) that are arranged in chambers (5 a, 5 b . . . 5 n) that are connected to a common supply circuit (6).
4. Pump according to claim 3, wherein the chambers (5 a, 5 b . . . 5 n) are connected to a common conveyor circuit (10).
5. Pump according to claim 1, wherein the pistons (1 a, 1 b . . . 1 n) are actuated by single-lobe or multi-lobe cams (2 a, 2 b . . . 2 n) that are arranged in parallel on a camshaft (3).
6. Pump according to claim 3, wherein the chambers (5 a, 5 b . . . 5 n) are each connected to a conveyor circuit that is specific thereto.
7. Pump according to claim 1, wherein the pistons (1 a, 1 b . . . 1 n) are actuated by a single cam (2), whereby said pistons are arranged radially around the cam (2).
8. Pump according to claim 2, wherein the pistons (1 a, 1 b . . . 1 n) are actuated by single-lobe or multi-lobe cams (2 a, 2 b . . . 2 n) that are arranged in parallel on a camshaft (3).
9. Pump according to claim 3, wherein the pistons (1 a, 1 b . . . 1 n) are actuated by single-lobe or multi-lobe cams (2 a, 2 b . . . 2 n) that are arranged in parallel on a camshaft (3).
10. Pump according to claim 4, wherein the pistons (1 a, 1 b . . . 1 n) are actuated by single-lobe or multi-lobe cams (2 a, 2 b . . . 2 n) that are arranged in parallel on a camshaft (3).
11. Pump according to claim 2, wherein the pistons (1 a, 1 b . . . 1 n) are actuated by a single cam (2), whereby said pistons are arranged radially around the cam (2).
12. Pump according to claim 3, wherein the pistons (1a, 1 b . . . 1 n) are actuated by a single cam (2), whereby said pistons are arranged radially around the cam (2).
13. Pump according to claim 4, wherein the pistons (1 a, 1 b . . . 1 n) are actuated by a single cam (2), whereby said pistons are arranged radially around the cam (2).
US11/819,836 2006-07-07 2007-06-29 Transfer pump with several pistons Abandoned US20080008605A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR06/06240 2006-07-07
FR0606240A FR2903456B1 (en) 2006-07-07 2006-07-07 TRANSFER PUMP WITH MULTIPLE PISTONS

Publications (1)

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US20080008605A1 true US20080008605A1 (en) 2008-01-10

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US11/819,836 Abandoned US20080008605A1 (en) 2006-07-07 2007-06-29 Transfer pump with several pistons

Country Status (7)

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US (1) US20080008605A1 (en)
EP (1) EP1876353B1 (en)
JP (1) JP2008014315A (en)
KR (1) KR20080005088A (en)
AT (1) ATE446450T1 (en)
DE (1) DE602007002849D1 (en)
FR (1) FR2903456B1 (en)

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EP2824299A1 (en) 2013-07-11 2015-01-14 Mahle International GmbH Heat recovery system for an internal combustion engine
EP2824307A1 (en) 2013-07-11 2015-01-14 Mahle International GmbH Heat recovery system for an internal combustion engine
US20160138489A1 (en) * 2013-06-26 2016-05-19 Robert Bosch Gmbh High-pressure pump and fuel injection system having a high-pressure pump
US20160208796A1 (en) * 2013-10-14 2016-07-21 Continental Automotive Gmbh High Pressure Pump
US20160298621A1 (en) * 2015-04-13 2016-10-13 Bernd Niethammer Pump for a selective catalytic reduction (scr) system in vehicles
US20170175729A1 (en) * 2014-09-08 2017-06-22 Pressure Wave Systems Gmbh Cooling Device Equipped with a Compressor Device
US20190032685A1 (en) * 2017-07-26 2019-01-31 Kerr Machine Co. Bellows System For Fluid End
CN109882384A (en) * 2019-04-01 2019-06-14 延边可喜安东洋电子有限公司 A piston pump for improving water flow of natural circulation water heating boiler
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US20160138489A1 (en) * 2013-06-26 2016-05-19 Robert Bosch Gmbh High-pressure pump and fuel injection system having a high-pressure pump
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DE602007002849D1 (en) 2009-12-03
EP1876353B1 (en) 2009-10-21
FR2903456B1 (en) 2008-10-17
ATE446450T1 (en) 2009-11-15
FR2903456A1 (en) 2008-01-11
JP2008014315A (en) 2008-01-24
EP1876353A1 (en) 2008-01-09

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