EP3402979B1 - Fuel pump - Google Patents

Fuel pump Download PDF

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Publication number
EP3402979B1
EP3402979B1 EP17700137.7A EP17700137A EP3402979B1 EP 3402979 B1 EP3402979 B1 EP 3402979B1 EP 17700137 A EP17700137 A EP 17700137A EP 3402979 B1 EP3402979 B1 EP 3402979B1
Authority
EP
European Patent Office
Prior art keywords
plunger
engagement
spring seat
central
aperture
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
EP17700137.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3402979A1 (en
Inventor
Levent AKIN
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
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 Delphi Technologies IP Ltd filed Critical Delphi Technologies IP Ltd
Publication of EP3402979A1 publication Critical patent/EP3402979A1/en
Application granted granted Critical
Publication of EP3402979B1 publication Critical patent/EP3402979B1/en
Active legal-status Critical Current
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
    • F02M59/44—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
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • 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
    • F04B1/0408—Pistons
    • 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
    • F04B1/0426—Arrangements for pressing the pistons against the actuated cam; Arrangements for connecting the pistons to the actuated cam

Definitions

  • the present invention relates to a cam actuated high pressure fuel pump adapted to be arranged in a fuel injection equipment of an internal combustion engine.
  • the invention particularly focuses on the arrangement of a spring seat onto the extremity of a plunger.
  • Fuel injection equipment comprise high pressure pump aiming at pressurizing fuel at several thousands of bars prior to flow said fuel to injectors that spray the fuel in combustion chambers of an internal combustion engine.
  • a known high pressure fuel pump comprises a pumping head provided with a bore in which a piston translates along a pumping axis of the bore performing a pumping cycle.
  • the piston also identified as a plunger, performs the pumping cycle between a Top Dead Centre (TDC) position around which fuel in the compression chamber is compressed and, a Bottom Dead Centre (BDC) position around which fuel is aspired in the chamber.
  • TDC Top Dead Centre
  • BDC Bottom Dead Centre
  • the piston reciprocates under the influence of a cam rotating about a cam axis perpendicular to the pumping axis.
  • the cam is followed by a cam follower combined to an external extremity of the piston, said cam follower typically having a cup-like body member in which a roller is free to rotate about a rolling axis perpendicular to the piston axis and parallel to the cam axis.
  • a spring arranged around the plunger and compressed between the pumping head and a spring seat cooperating with the cam follower and fixed to the extremity of the plunger maintains the roller in contact against the outer track of the cam.
  • the spring permanently bias the cam follower against the cam and it also pulls the piston as it travels from the Top Dead Centre (TDC) position to the Bottom Dead Centre (BDC) position thanks to the engagement of the spring seat member and the plunger.
  • the spring seat is an axisymmetric part having a central circular portion, for complementary arrangement to the extremity of the plunger, a perpendicular cylindrical portion axially extending from the circular edge of the central portion and, a peripheral annular disc portion for receiving the spring.
  • the central and peripheral portions extend in parallel plans separated from each other by the cylindrical portion.
  • the spring seat is mounted to an outer diameter of the piston by pressing.
  • the spring seat member may be fixedly mounted to the piston such that relative movement is inhibited.
  • a mounting collar may be fixedly mounted to an outer diameter of the piston to support the spring seat member, for example by press fitting.
  • the spring seat member may be movable relative to the piston, but is operatively biased against the collar by the action of the spring.
  • the spring seat and the collar may both be press-fitted on the plunger.
  • a further alternative is to form a keyed interface for mounting the spring seat member to the piston.
  • the keyed interface may not require a press fit arrangement, but machining is required to form the keyed interface on the piston and/or the spring seat member.
  • the spring seat comprises a central portion surrounded with a peripheral disc portion for receiving the spring, the central portion being provided with a central aperture allowing the plunger to pass therethrough and be positioned in a final position.
  • the spring seat further comprises an engagement aperture enabling through engagement of the extremity of the plunger in a preliminary engagement position distinct from the final position, said engagement aperture opening into the central aperture so that the plunger can be moved from the engagement position to the final position.
  • the extremity of the plunger is provided with a transverse diametral through hole in which is engaged a pin protruding from both extremities of the hole, the engagement aperture enabling passage of said pin until final positioning of the plunger in the central aperture.
  • the engagement aperture has a rectangular section forming diametrally opposed slots radially extending from the circular central aperture so that the plunger and the pin can be engaged therethrough said central and engagement apertures prior to be rotated to the final position.
  • the spring seat is further provided with rectangular notches forming recess in the central portion of the spring seat, the notches radially extending from the circular central opening, so that the pin can position in said notches when the plunger is in final position.
  • the final position is 90° apart from the engagement position.
  • the spring seat may comprise a cylindrical portion axially extending from a first circular edge to an opposed second circular edge, the central portion wherein is arranged the central opening inwardly radially extending from the first circular edge and, the peripheral disc portion for receiving the spring outwardly radially extending from the second circular edge.
  • the engagement aperture partially opens in the wall of said cylindrical portion.
  • a high pressure fuel pump 10 having a pumping head 12 wherein fuel at low pressure enters via an inlet into a compression chamber wherefrom it is expelled pressurized via an outlet, after a cylindrical piston 14, having diameter D14, reciprocally translating in a bore 16 along a pumping axis X has performed a pumping cycle.
  • the piston 14 protrudes outside the pumping head 12 and extends toward an external extremity 18 where is arranged a spring seat 20 cooperating with a cam-follower 22 permanently maintained in contact against the outer track of a rotating cam 24 by a spring 26 that is compressed between a face of the pumping head 12 and the spring seat 20.
  • the cam 24 rotates, the follower 22 imparts to the piston 14 a reciprocating movement generating said pumping cycle.
  • the piston 14 is described having a constant diameter D14 throughout its length from the extremity inside the bore 16 to the external extremity.
  • the external extremity of the plunger may have a slightly smaller diameter than the upper extremity that slides in the bore.
  • the spring seat 20 comprises a central circular portion 28, a perpendicular cylindrical portion 30 axially extending from the peripheral circular edge of the central circular portion 28 to another distant circular edge and, a peripheral annular disc portion 32 outwardly extending from said another distant circular edge.
  • the central 28 and the peripheral 32 portions extend in parallel plans transverse to the pumping axis X, and are separated from each other by the height of the cylindrical portion 30.
  • the peripheral annular disc portion 32 is adapted to receive the spring 26. This defines an orientation of the spring seat 20 where an upper-side faces the pumping head, best shown on figure 4 , is opposed to an under-side facing the cam, best shown on figure 5 .
  • the terms such as upper and under are only utilized to ease and clarify the description without any intent to limit the scope of the invention.
  • the under-side has a concave shape, the cylindrical portion defining an under space S.
  • the extremity 18 of the plunger is provided with a pin 36 fixedly arranged in a diametral through hole 38 pierced in said external extremity of the plunger.
  • the pin 36 symmetrically protruding from both sides of the plunger is, in a preferred embodiment, an elastic pin enabling press engagement and fixation in the hole 38 via elastic contact pressure.
  • Coiled pin, slotted elastic pin or solid cylindrical rod are also possible alternatives.
  • the central portion 28 of the spring seat is provided with a circular central aperture 34 of diameter D34 slightly superior to the diameter D14 of the plunger. From said central aperture 34 radially extend two diametrally opposed lateral rectangular apertures 40 having dimensions slightly superior to the dimensions of the pin in order to enable through passage of the pin 36.
  • the lateral rectangular apertures 40 are also identified as engagement aperture 34.
  • the lateral rectangular extensions 40 extend within the central portion 28 of the spring seat and do not cut into the cylindrical portion 30.
  • the lateral rectangular extensions 40 may extend to the cylindrical portion and cut out said lateral face of the spring seat.
  • the pin 36 is firstly engaged in the hole 38 of the plunger so that said pin 36 symmetrically protrudes from both sides of the hole. Secondly, the plunger and pin assembly is placed before the spring seat oriented and axially aligned with the central aperture 34 and its lateral rectangular extensions 40 then, thirdly, the plunger and pin assembly is axially X engaged through the central portion of the spring seat, the plunger 14 passing through the central aperture 34 and the pin 36 passing through the lateral rectangular extensions 40. This intermediate position where the pin is aligned with the lateral apertures is identified as the engagement position.
  • the plunger is rotated about the axis X by 90°, so that the pin 36 is no longer aligned with the lateral rectangular extensions 40. Said position where the spring seat cannot disengage from the shaft is identified as being the final position.
  • the under-side of the central portion of the spring seat is provided with two lateral notches 42 diametrally opposed and radially extending from the central aperture 34. Said notches 42, arranged 90° apart from the lateral extensions 34, set the final position, the pin 36 being complementary arranged in the notches.
  • the machining of the notches 42 is done radially from the outside of the spring seat so that round openings in the peripheral cylindrical face 30 are made and are visible.
  • the machining of said notches 42 is entirely done via the underside of the spring seat without leaving openings in the cylindrical face.
  • the angle between the engagement position and the final position of the spring seat is described as 90° but other angles are possible, provided said other angle is sufficient to keep the pin distant from the lateral extensions.
  • the height of the space S is adjusted to the length of the extremity of the plunger protruding in the under-side of the central portion.
  • Other arrangements where the plunger is slightly longer and extends below the spring seat or, to the contrary where the plunger is shorter are also possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
EP17700137.7A 2016-01-15 2017-01-06 Fuel pump Active EP3402979B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1600766.8A GB201600766D0 (en) 2016-01-15 2016-01-15 Fuel pump
PCT/EP2017/050281 WO2017121690A1 (en) 2016-01-15 2017-01-06 Fuel pump

Publications (2)

Publication Number Publication Date
EP3402979A1 EP3402979A1 (en) 2018-11-21
EP3402979B1 true EP3402979B1 (en) 2020-03-18

Family

ID=55488012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17700137.7A Active EP3402979B1 (en) 2016-01-15 2017-01-06 Fuel pump

Country Status (4)

Country Link
EP (1) EP3402979B1 (zh)
CN (1) CN108603478B (zh)
GB (1) GB201600766D0 (zh)
WO (1) WO2017121690A1 (zh)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT312995B (de) * 1972-04-05 1974-01-25 Friedmann & Maier Ag Einspritzpumpe für Brennkraftmaschinen
DE3605056A1 (de) * 1986-02-18 1987-08-20 Bosch Gmbh Robert Kraftstoffeinspritzpumpe fuer brennkraftmaschinen
JP4439723B2 (ja) * 2000-12-28 2010-03-24 株式会社ミクニ 燃料ポンプ
JP2003227434A (ja) * 2002-01-31 2003-08-15 Denso Corp 分配型燃料噴射ポンプ
US20050100466A1 (en) * 2003-01-09 2005-05-12 Nobuo Aoki Fuel supply pump
JP2008095573A (ja) * 2006-10-10 2008-04-24 Toyota Motor Corp 高圧ポンプ
CN201225273Y (zh) * 2008-06-21 2009-04-22 施小林 新型柱塞式喷射泵
CN201381921Y (zh) * 2009-04-09 2010-01-13 周书田 单缸小缸径高速柴油机喷油泵总成
ITMI20120270A1 (it) * 2012-02-23 2013-08-24 Bosch Gmbh Robert Pompa di alta pressione per alimentare combustibile ad un motore a combustione interna

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
EP3402979A1 (en) 2018-11-21
GB201600766D0 (en) 2016-03-02
CN108603478B (zh) 2020-12-11
CN108603478A (zh) 2018-09-28
WO2017121690A1 (en) 2017-07-20

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