EP3111080B1 - Mécanisme de pompage de carburant - Google Patents

Mécanisme de pompage de carburant Download PDF

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Publication number
EP3111080B1
EP3111080B1 EP15702207.0A EP15702207A EP3111080B1 EP 3111080 B1 EP3111080 B1 EP 3111080B1 EP 15702207 A EP15702207 A EP 15702207A EP 3111080 B1 EP3111080 B1 EP 3111080B1
Authority
EP
European Patent Office
Prior art keywords
pumping
intermediate member
tappet
contact surface
plunger
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
EP15702207.0A
Other languages
German (de)
English (en)
Other versions
EP3111080A1 (fr
Inventor
Christopher Mccrindle
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
Original Assignee
Delphi Technologies IP Ltd
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Filing date
Publication date
Application filed by Delphi Technologies IP Ltd filed Critical Delphi Technologies IP Ltd
Publication of EP3111080A1 publication Critical patent/EP3111080A1/fr
Application granted granted Critical
Publication of EP3111080B1 publication Critical patent/EP3111080B1/fr
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Anticipated expiration legal-status Critical

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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
    • 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
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • 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
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms

Definitions

  • the present invention relates to a fuel pump for use in an internal combustion engine, and more particularly to an improved pumping mechanism for a fuel pump having at least one pumping element which is driven by an engine-driven cam or other appropriate drive arrangement.
  • FIG. 1 is a cross-sectional partial view of a pumping mechanism in accordance with the prior art.
  • a common pumping mechanism 100 for a fuel pump for an internal combustion engine comprises a pump housing 102, containing a pumping element location bore 120 in which a pumping element such as a plunger 114 is moveable.
  • a first end (not shown) of the plunger 114 extends into a pumping chamber (not shown) defined at one end of the pumping element location bore 120.
  • the pumping mechanism 100 further comprises a driving mechanism such as a cam roller 110, and an intermediate member such as a follower or tappet 112, which is moveable within an intermediate member location bore 122.
  • Document GB discloses a hydraulic pump.
  • the plunger 114 is urged further into the pumping element location bore 120, by a driving force applied by the cam roller 110.
  • load is transferred from the cam roller 110 to the plunger 114 via a contact surface 116 provided on the tappet 112, and a contact surface 118 provided at a second end 128 of the plunger 114.
  • the plunger 114 is urged into the pumping chamber by the cam load, thereby reducing the volume of the pumping chamber, causing fuel in the pumping chamber to become pressurised.
  • the contact surface 116 of the tappet 112 would make a flat, even contact with a flat contact surface 118 of the plunger 114.
  • the axes of the plunger 114 and tappet 112 within their respective location bores are usually misaligned, due to geometry errors and clearances.
  • the tappet will usually be caused to tilt within the tappet location bore 122 at an angle relative to the cam load.
  • the radius provided on the plunger 112 must be selected in accordance with the anticipated misalignment of the axis of the tappet 114 from the axis of the tappet location bore 122. It is preferable for the radius provided on the plunger 112 to be large, thereby ensuring that contact (Hertzian) stresses are maintained within the capability of the materials. However, if the radius is too large, edge contact will occur when the tappet 112 is tilted within the tappet location bore 122. Accordingly, selection of a sufficiently large radius for the end of the pumping element is constrained by the requirement to avoid edge contact and resulting high point stresses.
  • FIGS 2 and 3 are enlarged cross-sectional partial views of the prior art pumping mechanism of Figure 1 .
  • the tappet contact surface 116 contacts the plunger contact surface 118 during the pumping stroke at a contact point, indicated generally at 130. As illustrated, even with a radiused end of plunger 112, the contact point 130 occurs towards to a side portion of the contact surfaces 116, 118.
  • the present invention provides, in a first aspect, a pumping mechanism for a fuel pump according to claim 1.
  • the intermediate member is usually caused to tilt to a known angle.
  • the intermediate member contact surface is angled with respect to the axial axis of the intermediate member to this known angle, such that during the pumping stroke, the intermediate member contact surface is orthogonal with the longitudinal axis of the intermediate member location bore.
  • Selecting the angle A of the tappet contact surface in accordance with the predictable tilt of the tappet within the tappet bore during the pumping stroke ensures that the nominal contact between the contact surfaces occurs substantially at the centre of each contact surface, thereby avoiding edge contact.
  • the present invention allows a larger degree of tilt of the tappet within the tappet location bore, or allows a larger radius to be provided on the plunger. Contact stresses are thereby maintained within the capabilities of the materials providing greater durability, or the possibility of higher pressure running, than prior art embodiments.
  • the second end of the pumping element is preferably radiused, thereby providing an arcuate pumping element contact surface.
  • the present invention comprises a pumping mechanism 200 comprising a pump housing 202.
  • the pump housing 202 comprises a plunger location bore 220 for locating a pumping element in the form of a plunger 214, a driving mechanism comprising a cam roller 210, and an intermediate member comprising a tappet 212 located in a tappet location bore 222.
  • the plunger location bore 220 defines a pumping chamber 224 at one end, into which a first end 226 of the plunger 214 extends.
  • the tappet 212 is provided with a tappet contact surface 216, for contacting with a plunger contact surface 218 ( Figure 6 ) provided at a second end 228 of the plunger 214 remote from the first end 226.
  • the figures represent a pumping stroke, wherein the tappet contact surface 216 is in contact with the plunger contact surface 218, i.e. load from the cam roller 210 is being imparted to contact surface 218 of the plunger 214 via the contact surface 216 of the tappet 212. Consequently, the plunger 214 is being urged further into the plunger location bore 220 by the cam load, thereby causing fuel in the pumping chamber 224 to become pressurised.
  • the tappet location bore 220 has a longitudinal axis B, and the plunger 214 has a longitudinal axis P.
  • the clearance between the plunger 214 and the plunger location bore 220 is minimal, therefore any tilting of the plunger P within the plunger location bore 220 is negligible. Therefore, the longitudinal axis B of the tappet location bore 222 is substantially coincident with the longitudinal axis P of the plunger 214.
  • the second end 228 of the plunger 214 is radiused, such that the plunger contact surface 218 is arcuate.
  • the tappet contact surface 216 is substantially flat, and is angled at an angle A with respect to an axial axis T of the tappet (wherein axis T is perpendicular to an external wall 232 of the tappet 212, as indicated in Figure 5 ).
  • the axial axis T of the tappet is orthogonal to the axis B of the tappet location bore 222 and the axis P of the plunger.
  • the tappet 212 is caused to tilt within the tappet location bore 222, to an angle A.
  • the axial axis T of the tappet is no longer orthogonal with the axis B of the tappet location bore 222.
  • the direction and degree A of tilt of the tappet 212 within the tappet location bore 222 is consistent in each pumping stroke for a nominal clearance, i.e. the direction and angle of tilt A can be predicted for a given fuel pump for a nominal clearance.
  • the direction of tilt, and the angle of the tappet contact surface 216 is selected in accordance with the predicable tilt of the tappet 212 during the pumping stroke, i.e.
  • the tappet contact surface 216 is angled at angle A to the axial axis T of the tappet 212, such that when the tappet 212 is in the tilted position, the angled tappet contact surface 216 is orthogonal with the axis B of the tappet location bore 222.
  • a nominal contact point (most clearly indicated in Figure 8 , at approximately point 230)
  • the plunger contact surface 218 occurs substantially at the centre of the plunger contact surface 216, thereby avoiding high point stresses which would result from edge contact. Allowing a larger radius to be provided on the plunger 214 ensures that contact stresses are maintained within the capabilities of the materials, or allows the pumping mechanism to be run at higher pressures.

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 (2)

  1. Mécanisme de pompage (200) pour une pompe à carburant pour une utilisation dans un moteur à combustion interne, le mécanisme de pompage (200) comprenant :
    un perçage de réception d'élément de pompage (220) pour recevoir un élément de pompage (214), un perçage de réception d'élément intermédiaire (222) pour recevoir un élément intermédiaire (212),
    dans lequel l'élément intermédiaire (212) est apte à coopérer avec un mécanisme d'entraînement (210),
    dans lequel l'élément de pompage (214) peut être déplacé à l'intérieur et le long d'un axe longitudinal (B) du perçage de réception d'élément de pompage (220), pour pressuriser du carburant à l'intérieur d'une chambre de pompage (224) adjacente à une première extrémité (226) de l'élément de pompage (214) pendant une course de pompage ;
    l'élément intermédiaire (212) pouvant être déplacé à l'intérieur du perçage de réception d'élément intermédiaire (222) ;
    dans lequel l'élément intermédiaire (212) comprend une surface de contact d'élément intermédiaire (216) pour venir en contact avec une surface de contact d'élément de pompage (218) située au niveau d'une deuxième extrémité (228) de l'élément de pompage (214) éloignée de la première extrémité (226), pour ainsi transférer une charge depuis le mécanisme d'entraînement (210) à l'élément de pompage (214) pendant la course de pompage ;
    dans lequel la surface de contact d'élément intermédiaire (216) forme un angle par rapport à un axe axial (T) de l'élément intermédiaire (212) ;
    caractérisé en ce que, pendant la course de pompage, l'élément intermédiaire (212) est amené à s'incliner à l'intérieur du perçage de réception d'élément intermédiaire (222) à un angle connu (A), et dans lequel la surface de contact d'élément intermédiaire (216) forme un angle par rapport à l'axe axial (T) de l'élément intermédiaire (212) à l'angle connu (A), de sorte que, pendant la course de pompage, la surface de contact d'élément intermédiaire (216) est orthogonale à l'axe longitudinal (B) du perçage de réception d'élément intermédiaire (222).
  2. Mécanisme de pompage (200) selon la revendication 1, dans lequel la deuxième extrémité (228) de l'élément de pompage (214) est arrondie, créant ainsi une surface de contact d'élément de pompage arquée (218).
EP15702207.0A 2014-02-25 2015-01-26 Mécanisme de pompage de carburant Active EP3111080B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14156469.0A EP2910769A1 (fr) 2014-02-25 2014-02-25 Mécanisme de pompage de carburant
PCT/EP2015/051453 WO2015128133A1 (fr) 2014-02-25 2015-01-26 Mécanisme de pompage de carburant

Publications (2)

Publication Number Publication Date
EP3111080A1 EP3111080A1 (fr) 2017-01-04
EP3111080B1 true EP3111080B1 (fr) 2019-12-11

Family

ID=50190234

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14156469.0A Withdrawn EP2910769A1 (fr) 2014-02-25 2014-02-25 Mécanisme de pompage de carburant
EP15702207.0A Active EP3111080B1 (fr) 2014-02-25 2015-01-26 Mécanisme de pompage de carburant

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP14156469.0A Withdrawn EP2910769A1 (fr) 2014-02-25 2014-02-25 Mécanisme de pompage de carburant

Country Status (4)

Country Link
EP (2) EP2910769A1 (fr)
KR (1) KR102156134B1 (fr)
CN (1) CN106103969B (fr)
WO (1) WO2015128133A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2543354A (en) 2015-10-16 2017-04-19 Gm Global Tech Operations Llc Roller tappet for a fuel unit pump of an internal combustion engine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4771676A (en) * 1986-05-19 1988-09-20 Toshiba Kikai Kabushiki Kaisha Hydraulic transmission device
JP2001041129A (ja) * 1999-07-27 2001-02-13 Toyota Motor Corp 高圧ポンプ
DE10212492B4 (de) * 2002-03-21 2012-02-02 Daimler Ag Kolbenpumpe
DE102006045933A1 (de) * 2006-09-28 2008-04-03 Robert Bosch Gmbh Stößelbaugruppe für eine Hochdruckpumpe und Hochdruckpumpe mit wenigstens einer Stößelbaugruppe
DE102007022220A1 (de) * 2007-05-11 2008-11-13 Robert Bosch Gmbh Hochdruckpumpe für ein Kraftstoffsystem einer Brennkraftmaschine
JP5372692B2 (ja) * 2009-10-06 2013-12-18 日立オートモティブシステムズ株式会社 高圧燃料ポンプ
GB201202221D0 (en) * 2012-02-09 2012-03-28 Delphi Tech Holding Sarl Improvements relating to fuel pumps

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3111080A1 (fr) 2017-01-04
CN106103969A (zh) 2016-11-09
KR20160123313A (ko) 2016-10-25
EP2910769A1 (fr) 2015-08-26
CN106103969B (zh) 2018-09-18
KR102156134B1 (ko) 2020-09-16
WO2015128133A1 (fr) 2015-09-03

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