EP0157335A2 - Verfahren zur Druckwellen- oder Schwankungsdämpfung in den Zuführungsröhren einer hydraulischen Pumpe und angepasste Pumpe - Google Patents

Verfahren zur Druckwellen- oder Schwankungsdämpfung in den Zuführungsröhren einer hydraulischen Pumpe und angepasste Pumpe Download PDF

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Publication number
EP0157335A2
EP0157335A2 EP85103536A EP85103536A EP0157335A2 EP 0157335 A2 EP0157335 A2 EP 0157335A2 EP 85103536 A EP85103536 A EP 85103536A EP 85103536 A EP85103536 A EP 85103536A EP 0157335 A2 EP0157335 A2 EP 0157335A2
Authority
EP
European Patent Office
Prior art keywords
hydraulic pump
piston
hydraulic
damping
hole
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.)
Withdrawn
Application number
EP85103536A
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English (en)
French (fr)
Other versions
EP0157335A3 (de
Inventor
Alain Devaux
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.)
MAN Energy Solutions France SAS
Original Assignee
Societe dEtudes de Machines Thermiques SEMT 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 Societe dEtudes de Machines Thermiques SEMT SA filed Critical Societe dEtudes de Machines Thermiques SEMT SA
Publication of EP0157335A2 publication Critical patent/EP0157335A2/de
Publication of EP0157335A3 publication Critical patent/EP0157335A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/001—Pumps with means for preventing erosion on fuel discharge
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the present invention relates to a method for damping hydraulic pressure waves and for clipping pressure variations in the supply conduits of a hydraulic pump, as well as a hydraulic pump allowing the implementation of this method, which can be, for example, a fuel injection pump or a pump for controlling the positioning of hydraulic cylinders.
  • a method for limiting the pressure waves and for clipping the pressure variations which consists in placing pressure accumulators in the supply conduits or on the body of the pump.
  • pressure accumulators have a capacity commonly reaching 200% of the maximum displacement of the pump.
  • Document GB 468 958 also discloses a device for damping hydraulic pressure waves and for clipping pressure variations, consisting of a movable wall which is resiliently disposed normally in the direction of the fluid jet, but this device is installed on a pump fitted with a feed chamber which does not communicate directly with the device so that the feed hole of the working chamber is separate from the repression.
  • This device then plays the role of a conventional capacity making it possible to absorb most of the quantity of fuel discharged at low loads.
  • the increase in volume is then very significant and, moreover, the movable wall, in the rest position, is very far from the working chamber so that the kinetic energy of the fluid is ineffective.
  • the object of the present invention is to dampen the pressure waves and to limit pressure variations, without having recourse to significant accumulating capacities but by using the kinetic energy of the fluid by direct transfer to the movable wall elastically.
  • the subject of the present invention is a method for damping hydraulic pressure waves and for clipping pressure variations in the supply conduits of a hydraulic pump provided with a supply chamber, consisting in transforming energy potential stored in the excess fluid in the working chamber in kinetic energy, characterized in that this kinetic energy is directly used to temporarily increase the volume of the supply chamber by a value between 10 and 30% of the displacement maximum of the hydraulic pump.
  • the present invention also relates to a hydraulic pump, allowing the implementation of the method according to claim 1, comprising a supply chamber receiving the supply line (s), a piston with rectilinear and constant stroke inside d '' a working chamber, provided with at least one edge regulating in a selectively variable manner the end of the delivery process out of the pump by cooperation with at least one hole putting in communication the working chamber with the feeding chamber , at least one device for damping hydraulic pressure waves and for clipping pressure variations, consisting of an elastically movable wall normally arranged in the direction of the fluid jet, characterized in that the wall is located in the chamber d 'supply, in the axis of a hole and near this hole at a distance not exceeding 1.5 times the smallest diameter of the hole.
  • the movable wall of the device is part of a hermetically sealed and deformable enclosure, mechanically limited in expansion and compression, and containing a gas under pressure possibly accompanied by a liquid and / or possibly a spring, part of the deformable enclosure consisting of a cylindrical tube with corrugated wall , the undulations allowing a deformation along its axis.
  • the movable wall of the device constitutes a piston of low inertia partially closing a housing containing the enclosure, grooves and / or holes provided in the piston or in the wall of the housing putting the housing in communication with the chamber. food.
  • a hydraulic pump according to the invention which is a fuel injection pump.
  • Figure 1 is a schematic view showing the injection pump provided with two damping and clipping devices.
  • Figure 2 is a detailed view of a damping and clipping device.
  • FIG. 1 there is shown a pump body 1, a cylinder 2 fixed in a known manner in the body 1, a cylinder head 3 having a non-return valve 4 closing an orifice 3 ', a piston 10 which delimits between its face upper 15 and the cylinder head 3 a working chamber 5, an annular supply chamber 6, also called collecting chamber 6, placed in communication with the working chamber 5 by means of two holes 7 and finally, two tubular bodies 21 each enclosing a damping and clipping device, these two bodies each opening into the collecting chamber 6, in the axis of a hole 7.
  • the fuel injection pump may have only one hole and an associated device, but generally, an injection pump has two diametrically opposite holes 7 to prevent the piston from being subjected to lateral loads due to hydraulic thrusts. .
  • the piston 10 has a groove 11, a vertical groove 12, another diametrically opposite vertical groove not shown, a recess 13 which delimits an oblique edge 14 and another recess delimiting another oblique edge, not shown.
  • the piston 10 is moved vertically in the cylinder 2, by means of a cam not shown and performs by mounting a compression stroke and descending a suction stroke. Furthermore, a rack, not shown, meshes with a toothing of a part connected to the piston, in order to angularly position the latter and to modify the instant of the end of the injection via the oblique edges.
  • FIG. 2 showing the cylinder 2 provided with a hole 7, there is shown in more detail, a device 20 opening into the collecting chamber 6 opposite a hole 7.
  • This device 20 is installed in a tubular body 21 comprising a bore 36, an external head 22, for example with a hexagon, allowing the tightening of this device, a thread 23 cooperating with a tapping 11 of the pump body 1, and one end 24 provided with a shoulder 25 forming a stop.
  • a seal 40 is interposed between the head 22 and the pump body 1.
  • tubular body 21 is not essential and the bore 36 with the shoulder 25 can be obtained directly by machining the pump body 1.
  • the device 20 comprises a piston 26 freely movable inside the bore 36, a plug 30 stopped in translation by a stop ring 32 and provided with an O-ring 33 ensuring the seal between the plug 30 and the bore 36. Shims 42 in variable number and thickness make it possible to modify the distance at rest between the piston 26 and the plug 30.
  • a cylindrical tube 34 with corrugated wall is tightly connected to the plug 30 and to the piston 26 by through the shoulders 31 and 28.
  • the cylindrical tube 34 as well as the shoulder 28 of the piston 26 and the shoulder 31 of the piston 30 constitute a hermetically sealed and deformable enclosure located in the bore 36 of the tubular body 21.
  • This enclosure is mechanically limited in expansion by the shoulder 25 and the stop ring 32, and mechanically limited in compression because each internal shoulder 28, 31 of the pistons 26 and of the plug 30 has a stop 28 ', 3 T.
  • These two stops also serve as a guide for a spring 35 which is supported on the shoulders 28, 31.
  • the presence of this spring is, of course, not essential because the hermetically sealed and deformable enclosure contains a pressurized gas, possibly accompanied by a liquid to modify the stiffness of the damper constituted solely by the gas or by the gas-spring assembly.
  • the piston 26 has an outer wall or face 27, flat or concave, advantageously made resistant to abrasion by an appropriate surface treatment, such as the deposition of a ceramic material.
  • This face 27 must be at a distance from the hole 7 not exceeding 1.5 times the smallest diameter of this hole.
  • the tubular body 21 has an orifice 37 and the pump body 1 has a groove 38, this orifice 37 and this groove 38 connecting the volume 41 existing between the bore 36, the tube 34, the piston 26 and the plug 30 with the collecting chamber 6.
  • the orifice 37 is produced at a distance 1 from the face 43 of the piston 26 when it is at rest on the shoulder 25. This distance 1 is slightly less than the distance L separating the two at rest stops 28 ′ and 31 ′ and thus, when the piston 26 moves back, closing the hole 37, prior to the mechanical abutment, causes the fuel trapped in the volume 41 to increase in pressure and ensures hydraulic abutment.
  • an orifice 37 ' can be made directly in the piston 26 and, in this case, the groove 38 and the hole 37 are not essential.
  • the variation in volume of the collecting chamber 6 generated by the displacement of the piston is between 10 and 30% of the maximum displacement of the injection pump.
  • the shims 42 make it possible to adjust the preload of the device 20 if necessary.
  • Kinetic energy is available at the outlet of hole 7 in the form of a small mass of fuel driven by a very high speed.
  • the impact that ensues on the face 27 of the piston 26 generates significant erosion.
  • the use of an appropriate treatment intended to increase the abrasion resistance of the face 27 makes it possible to limit the consequences of this phenomenon.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Reciprocating Pumps (AREA)
EP85103536A 1984-03-29 1985-03-26 Verfahren zur Druckwellen- oder Schwankungsdämpfung in den Zuführungsröhren einer hydraulischen Pumpe und angepasste Pumpe Withdrawn EP0157335A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8404904A FR2562165B1 (fr) 1984-03-29 1984-03-29 Procede et dispositif d'amortissement des ondes de pression hydrauliques et d'ecretage des variations de pression dans les conduits d'alimentation d'une pompe d'injection de combustible
FR8404904 1984-03-29

Publications (2)

Publication Number Publication Date
EP0157335A2 true EP0157335A2 (de) 1985-10-09
EP0157335A3 EP0157335A3 (de) 1987-05-06

Family

ID=9302589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85103536A Withdrawn EP0157335A3 (de) 1984-03-29 1985-03-26 Verfahren zur Druckwellen- oder Schwankungsdämpfung in den Zuführungsröhren einer hydraulischen Pumpe und angepasste Pumpe

Country Status (4)

Country Link
US (1) US4591321A (de)
EP (1) EP0157335A3 (de)
JP (1) JPS60222570A (de)
FR (1) FR2562165B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU707937B2 (en) * 1997-10-27 1999-07-22 Mitsubishi Denki Kabushiki Kaisha Cylinder injection high-pressure fuel pump
EP0947745A1 (de) * 1998-03-31 1999-10-06 Mitsubishi Denki Kabushiki Kaisha Dichtungsvorrichtung für einen Hochdruckbehälter

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4714066A (en) * 1980-08-14 1987-12-22 Jordan Robert D Fuel injector system
JPH0740696Y2 (ja) * 1987-06-12 1995-09-20 日本発条株式会社 油圧ポンプ装置
DE4009745A1 (de) * 1990-03-27 1991-10-02 Man B & W Diesel Ag Hochdruck-kraftstoffeinspritzpumpe
JP2884454B2 (ja) * 1991-11-20 1999-04-19 株式会社ゼクセル 燃料噴射ポンプ用プランジャのリード加工法
US5845621A (en) * 1997-06-19 1998-12-08 Siemens Automotive Corporation Bellows pressure pulsation damper
JP3471587B2 (ja) * 1997-10-27 2003-12-02 三菱電機株式会社 筒内噴射用高圧燃料ポンプ
GB9920210D0 (en) * 1999-08-27 1999-10-27 Lucas Industries Ltd Fuel pump
JP2002089405A (ja) * 2000-09-11 2002-03-27 Toyota Motor Corp 高圧燃料供給装置
US20040087897A1 (en) * 2002-07-31 2004-05-06 Birger Hjertman Device and method for liquid jet generation
SE0202350D0 (sv) * 2002-07-31 2002-07-31 Pharmacia Ab Device and method for liquid jet generation
US7610902B2 (en) * 2007-09-07 2009-11-03 Gm Global Technology Operations, Inc. Low noise fuel injection pump
EP2667012B1 (de) * 2012-05-25 2017-02-22 Caterpillar Motoren GmbH & Co. KG Prallkörper mit einem verschleißfestes Einsatzelement und Prallkörper für eine kolbenbetätigte Kraftstoffpumpe
DE102013012653B4 (de) * 2013-07-30 2015-02-19 L'orange Gmbh Druckspeicher

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468958A (en) * 1936-01-15 1937-07-15 John Forster Alcock Improvements in fuel injection pumps for internal combustion engines
FR2356020A1 (fr) * 1975-12-10 1978-01-20 Semt Procede pour absorber les fluctuations de pression dans les conduits de decharge et d'admission d'une pompe et dispositif pour la mise en oeuvre de ce procede

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1993759A (en) * 1932-06-21 1935-03-12 Bosch Robert Fuel injection pump
DE3307828A1 (de) * 1983-03-05 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzeinrichtung fuer brennkraftmaschinen
DE3307826A1 (de) * 1983-03-05 1984-09-06 Robert Bosch Gmbh, 7000 Stuttgart Kraftstoffeinspritzeinrichtung fuer brennkraftmaschinen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB468958A (en) * 1936-01-15 1937-07-15 John Forster Alcock Improvements in fuel injection pumps for internal combustion engines
FR2356020A1 (fr) * 1975-12-10 1978-01-20 Semt Procede pour absorber les fluctuations de pression dans les conduits de decharge et d'admission d'une pompe et dispositif pour la mise en oeuvre de ce procede

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU707937B2 (en) * 1997-10-27 1999-07-22 Mitsubishi Denki Kabushiki Kaisha Cylinder injection high-pressure fuel pump
EP0947745A1 (de) * 1998-03-31 1999-10-06 Mitsubishi Denki Kabushiki Kaisha Dichtungsvorrichtung für einen Hochdruckbehälter
US6382456B1 (en) 1998-03-31 2002-05-07 Mitsubishi Denki Kabushiki Kaisha Sealing device for a high-pressure vessel

Also Published As

Publication number Publication date
JPS60222570A (ja) 1985-11-07
US4591321A (en) 1986-05-27
FR2562165B1 (fr) 1988-06-17
EP0157335A3 (de) 1987-05-06
FR2562165A1 (fr) 1985-10-04

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Inventor name: DEVAUX, ALAIN