EP3283764B1 - Pompes à diesel de haute pression - Google Patents

Pompes à diesel de haute pression Download PDF

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Publication number
EP3283764B1
EP3283764B1 EP16714431.0A EP16714431A EP3283764B1 EP 3283764 B1 EP3283764 B1 EP 3283764B1 EP 16714431 A EP16714431 A EP 16714431A EP 3283764 B1 EP3283764 B1 EP 3283764B1
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EP
European Patent Office
Prior art keywords
tappet
pump according
cambox
housing
inlet
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.)
Active
Application number
EP16714431.0A
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German (de)
English (en)
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EP3283764A1 (fr
Inventor
Stephen MACLANE
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.)
Delphi Technologies IP Ltd
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Delphi Technologies IP Ltd
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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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0421—Cylinders
    • 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
    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0443—Draining of the housing; Arrangements for handling leaked fluids
    • 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
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations

Definitions

  • the present invention relates generally to the field of high pressure diesel fuel pumps. More particularly, but not exclusively, the present invention concerns low pressure inlets for high pressure diesel fuel pumps.
  • Known high pressure diesel fuel pumps comprise one or more plungers movable within plunger bores, to pressurise fuel within respective pumping chambers. Those chambers deliver the fuel onwards to a fuel injection system of an engine as disclosed in DE10356262 A1 and in DE102012222450A1 .
  • each plunger (not shown) of pump 1 is reciprocally movable along a pumping axis by a cam arrangement (driven by a drive shaft 15) to perform a fuel-pressurising pumping stroke and a plunger return spring to effect a plunger return stroke.
  • a tappet arrangement each of the plungers are driven within its bore via a tappet member 20.
  • a return spring acts on the top of the tappet member 20 to allow it to follow the cam profile to a dropped position.
  • a tappet vent 40 is provided within a wall of a drivetrain housing 5 between a spring chamber 30, housing the return spring above the tappet 20, and the cambox 10, below the tappet 20.
  • the tappet vent 40 typically allows pressurised lubrication fluid, such as fuel or oil, and air to escape from above the tappet 20 and return to the cambox 10.
  • a low pressure inlet 50 feeds either directly into the cambox 10 (inlet 50b) or into a lower portion of the vent 40 close to an opening into the cambox 10 (inlet 50a).
  • the inlet 50a/ 50b provides cooling flow of fluid to the driveshaft components.
  • a high pressure diesel fuel pump comprising a drivetrain assembly within a drivetrain housing and a pumping assembly, the drivetrain assembly comprising a cam mounted in a cambox, a tappet member arranged for reciprocal movement with the cam within a tappet chamber, and a spring mounted in a spring chamber acting on an upper surface of the tappet member, the pumping assembly comprising a pump housing and a plunger mounted within a bore formed in the pump housing for reciprocal movement along a pumping axis under the influence of the reciprocating tappet member, wherein the drivetrain housing comprises a vent arranged to connect said spring chamber and/or said tappet chamber with the cambox and a low pressure inlet for delivery of fluid to the drivetrain assembly, characterised in that the low pressure inlet is arranged to feed into the spring chamber, and wherein the inlet is located within 90° rotation of the vent around the pumping axis, wherein the inlet comprises an internal opening into the spring chamber and, wherein the internal opening is disposed
  • the feed of fluid through the inlet of the spring chamber makes use of the typical tappet vent (channel) between the spring chamber and the cambox to provide cooling flow of fluid to the top of the tappet and to the drivetrain assembly.
  • the inlet distanced from the source of the pulsation, being the cam in the cambox the pressure pulsations have time to attenuate to a level that has minimal effect on the rest of the system.
  • the flow of fluid is encouraged to take a defined path through the cambox, tappet chamber and vent, thereby minimising reverse flow.
  • the arrangement helps improve lubrication and durability of the pump components and reduces flow fluctuations and cavities often caused by reversing flow.
  • the inlet comprises a conduit leading to an external opening on an external surface of the housing.
  • the internal opening is disposed close to the tappet chamber.
  • the vent comprises an open-ended channel.
  • a first open end of the channel is located in the spring chamber.
  • the first open end of the channel may alternatively be located in the tappet chamber.
  • the channel comprises a second open end located in the cambox.
  • At least a portion of the internal opening is provided at a level between opposing top and bottom walls or loci of the first open end of the channel.
  • a bottom wall or locus of the internal opening is biased towards a level defined by a bottom wall or locus of the first open end.
  • a top wall or locus of the internal opening may be biased towards a level defined by a bottom wall or locus of the first open end.
  • the first open end comprises a height defined between opposing top and a bottom walls or loci).
  • the height of the first open end may be greater than a height of the inlet.
  • top and bottom walls/ loci are defined by reference to the pumping axis.
  • the internal opening of the inlet is disposed towards a tappet end of the spring chamber.
  • the internal opening is distanced from the first end of the channel. Most preferably, the internal opening is disposed approximately 90° rotation away from the first end.
  • the inlet is adapted to attach to a connector (not shown), which in turn connects with a fluid reservoir (not shown).
  • the cambox and the spring and tappet chambers are generally open to one another, e.g. flow of fluid is permissible therebetween and around the drive assembly.
  • the housing comprises a fluid outlet.
  • the fluid outlet comprises an internal opening into the cambox.
  • the outlet comprises a conduit leading to an external opening on an external surface of the housing.
  • the outlet is adapted to attach to a connector (not shown), which in turn connects with a hydraulic head (not shown).
  • a drivetrain housing for a high pressure diesel fuel pump, the drivetrain housing comprising a cambox adapted to receive a rotating cam, a tappet chamber adapted to receive a tappet member for reciprocal movement with the cam, and a spring chamber adapted to receive a spring for acting on an upper surface of the tappet member, wherein the drivetrain housing comprises a vent arranged to connect said spring chamber and/or said tappet chamber with the cambox and a low pressure inlet for delivery of fluid to the drivetrain assembly, characterised in that the low pressure inlet is arranged to feed into the spring chamber.
  • FIG 3 is a side view of a high pressure diesel fuel pump 100 according to an exemplary embodiment.
  • the pump 100 comprises a drivetrain assembly within a drivetrain housing 105 and a pumping assembly (not shown), the drivetrain assembly comprising a cam mounted in a cambox 110, a tappet member 120 arranged for reciprocal movement with the cam within a tappet chamber 125, and a spring mounted in a spring chamber 130 acting on an upper surface of the tappet member 120, the pumping assembly comprising a pump housing and a plunger mounted within a bore formed in the pump housing for reciprocal movement along a pumping axis A-A' under the influence of the reciprocating tappet member 120, wherein the drivetrain housing 105 comprises a vent 140 arranged to connect said spring chamber 130 and/or said tappet chamber 125 with the cambox 110 and a low pressure inlet 150 for delivery of fluid to the drivetrain assembly, the low pressure inlet 150 being arranged to feed into the spring chamber 130.
  • the drivetrain assembly is packaged within the drivetrain housing 105. Accordingly, the housing 105 comprises the cambox 110, the tappet chamber 125 and the spring chamber 130.
  • the cambox 110 and the chambers 125, 130 are generally open to one another, e.g. flow of fluid is permissible therebetween and around the drive assembly.
  • the cambox 110 comprises a substantially cylindrical compartment of varying diameter across its length within the drivetrain housing 105.
  • a drive shaft 115 with the cam thereon is mounted within the cambox 110.
  • the drive shaft 115 is attached at a first end to a drive means (not shown), which dictates a rotational axis B-B' of the drive shaft 115 and therefore, the rotational path of the cam fitted thereon.
  • the camebox 110 in which in use the cam is rotating comprises the camshaft which is guided in a bearing and a back chamber (not referenced) is drawn on the right of the figure 3 .
  • a back chamber (not referenced) is drawn on the right of the figure 3 .
  • the vent 140 creates a non-restricted fluid communication between the cambox 110 and the spring chamber 130 and / or the tappet chamber 125.
  • the tappet chamber 125 comprises a substantially cylindrical compartment of substantially equal diameter within the drivetrain housing 105.
  • the tappet chamber 125 is disposed perpendicularly to the cambox 110 so as to be generally upstanding above the cam. Accordingly, the pumping axis A-A' and the drive shaft rotational axis B-B' are disposed substantially perpendicularly to one another.
  • the spring chamber 130 comprises a substantially cylindrical compartment of substantially equal diameter within the drivetrain housing 105 and is provided coaxially with the tappet chamber 125, so as to be generally in line with the tappet chamber 125 and along the pumping axis A-A'.
  • the vent 140 comprises an open-ended passage 141 provided in the housing 105.
  • a first end 142 of the passage 141 communicates with a lower end of the spring chamber 130, whilst a second end 143 of the passage 141 opens up into an upper part of the cambox 110.
  • the low pressure inlet 150 comprises a first opening 151 into a lower end of the spring chamber 130, a conduit (not shown) through the housing 105 and a second opening (not shown) on an external surface of the housing 105.
  • the second opening of the inlet 150 is attached to an inlet connector (not shown), which in turn connects with a fluid reservoir (not shown).
  • the inlet 150 is ideally located within 90° rotation of the vent 140.
  • the housing 105 provides an outlet 155 leading from the cambox 110.
  • the outlet 155 comprises a first opening 156 extending from the cambox 110, a conduit 157 through the housing 105 and a second opening 158 on an external surface of the housing 105.
  • the second opening 158 of the outlet 155 is connected to a hydraulic head (not shown).
  • fluid is fed into the spring chamber 130 through the low pressure inlet 150 in the housing 105. Due to the positioning of the inlet 150, the fluid flows downwardly into the tappet chamber 125 to provide cooling flow to the upper surface of the tappet member 120.
  • the fluid above the tappet member 125 is pushed upwardly towards the spring chamber 130. Excess fluid flows into the first open end 142 of the tappet vent 140 to flow downwardly through the passage 141 and exit into the cambox 110 (via second open end 143) where it provides cooling flow to the drivetrain assembly components (the cam, driveshaft 115, bearings, etc.).
  • the rotation of the cam typically causes pressure pulses in the cambox 110, and can lead to reverse flow back through the tappet vent 140 and up into the tappet chamber 125.
  • a positive flow of fluid is established, such reverse flow is minimised.
  • the inlet 150 is distanced from the cambox 110, any such pulses are weakened before reaching the inlet 150 and any reverse flow back up the inlet connector has a minimal effect on any upstream components.
  • the repositioning of the low pressure inlet 150 (from the prior art position of directly into the cambox 110) to the spring chamber 130 provides a low pressure cooling/ lubrication flow of fluid into the housing 105 and around the drivetrain assembly without putting the upstream pump and engine components at risk of damaging pressure pulses. This in turn improves durability of the components.
  • the positive fluid flow path through the housing 105 provides for improved cooling and lubrication to the drivetrain assembly and minimises reverse flow that can cause cavities.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (13)

  1. Pompe à carburant diesel haute pression (100) comprenant un ensemble de transmission à l'intérieur d'un carter de transmission (105) et un ensemble de pompage, l'ensemble de transmission comprenant une came montée dans une boîte à cames (110), un élément de poussoir (120) agencé pour un mouvement de va-et-vient avec la came à l'intérieur d'une chambre de poussoir (125), et un ressort monté dans une chambre à ressort (130) agissant sur une surface supérieure de l'élément de poussoir (120), l'ensemble de pompage comprenant un carter de pompe et un plongeur monté à l'intérieur d'un alésage formé dans le carter de pompe pour un mouvement de va-et-vient le long d'un axe de pompage (A-A') sous l'influence de l'élément de poussoir en va-et-vient (120), dans laquelle le carter de transmission (105) comprend un évent (140) agencé pour relier ladite chambre à ressort (130) et/ou ladite chambre de poussoir (120) à la boîte à cames (110) et une entrée basse pression (150) pour délivrer du fluide à l'ensemble de transmission, caractérisé en ce que l'entrée basse pression (150) est agencée pour alimenter la chambre à ressort (150) et dans laquelle l'entrée (150) est située dans une rotation de 90° de l'évent (140) autour de l'axe de pompage (A-A'),
    dans laquelle l'entrée (150) comprend une ouverture interne dans la chambre à ressort (130) et,
    dans laquelle l'ouverture interne est disposée vers une extrémité inférieure de la chambre à ressort (130).
  2. Pompe selon la revendication 1, dans laquelle l'entrée (150) comprend un conduit menant à une ouverture externe sur une surface externe du carter (105).
  3. Pompe selon l'une quelconque des revendications 1 à 2, dans laquelle l'évent (140) comprend un canal à extrémité ouverte (141).
  4. Pompe selon la revendication 3, dans laquelle une première extrémité ouverte (142) du canal (141) est située dans la chambre à ressort (130).
  5. Pompe selon l'une quelconque des revendications 3 à 4, dans laquelle le canal (141) comprend une seconde extrémité ouverte (143) située dans la boîte à cames (110).
  6. Pompe selon la revendication 5, dans laquelle la seconde extrémité ouverte (143) située dans la boîte à cames (110) débouche dans la partie supérieure de la boîte à cames (110).
  7. Pompe selon l'une quelconque des revendications 1 à 6, dans laquelle au moins une partie de l'ouverture interne est prévue à un niveau entre des parois supérieure et inférieure opposées ou lieux de la première extrémité ouverte (142) du canal (141).
  8. Pompe selon la revendication 7, dans laquelle une paroi inférieure ou lieu de l'ouverture interne est sollicitée vers un niveau défini par une paroi inférieure ou un lieu de la première extrémité ouverte (142).
  9. Pompe selon l'une quelconque des revendications 1 à 8, dans laquelle l'ouverture interne de l'entrée (150) est disposée vers une extrémité de poussoir de la chambre à ressort (130).
  10. Pompe selon l'une quelconque des revendications 4 à 9, dans laquelle l'ouverture interne est éloignée de la première extrémité (142) du canal (141).
  11. Pompe selon l'une quelconque des revendications 1 à 10, dans laquelle l'ouverture interne est disposée à au moins approximativement 90° de rotation par rapport à la première extrémité (142).
  12. Pompe selon l'une quelconque des revendications 1 à 11, dans laquelle la boîte à cames (110) et les chambres à ressort et de poussoir (125, 130) sont généralement ouvertes l'une sur l'autre.
  13. Pompe selon l'une quelconque des revendications 1 à 12, dans laquelle le carter (105) comprend une sortie de fluide (155).
EP16714431.0A 2015-04-13 2016-04-05 Pompes à diesel de haute pression Active EP3283764B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1506194.8A GB201506194D0 (en) 2015-04-13 2015-04-13 High pressure diesel fuel pumps
PCT/EP2016/057459 WO2016165985A1 (fr) 2015-04-13 2016-04-05 Pompes de carburant diesel à haute pression

Publications (2)

Publication Number Publication Date
EP3283764A1 EP3283764A1 (fr) 2018-02-21
EP3283764B1 true EP3283764B1 (fr) 2022-07-13

Family

ID=53333665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16714431.0A Active EP3283764B1 (fr) 2015-04-13 2016-04-05 Pompes à diesel de haute pression

Country Status (3)

Country Link
EP (1) EP3283764B1 (fr)
GB (1) GB201506194D0 (fr)
WO (1) WO2016165985A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10356262A1 (de) * 2003-12-03 2005-06-30 Robert Bosch Gmbh Radialkolbenpumpe, insbesondere für Kraftstoffeinspritzsysteme
DE102009003254A1 (de) * 2009-05-20 2010-11-25 Robert Bosch Gmbh Kraftstoffeinspritzsystem ohne Rücklaufleitung
DE102012222450A1 (de) * 2012-12-06 2014-06-12 Robert Bosch Gmbh Gehäuse für ein Hochdruckpumpenelement
DE102013201357A1 (de) * 2013-01-29 2014-07-31 Robert Bosch Gmbh Hochdruckpumpe

Also Published As

Publication number Publication date
GB201506194D0 (en) 2015-05-27
WO2016165985A1 (fr) 2016-10-20
EP3283764A1 (fr) 2018-02-21

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