EP3329114B1 - High pressure fuel pump - Google Patents

High pressure fuel pump Download PDF

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Publication number
EP3329114B1
EP3329114B1 EP16734344.1A EP16734344A EP3329114B1 EP 3329114 B1 EP3329114 B1 EP 3329114B1 EP 16734344 A EP16734344 A EP 16734344A EP 3329114 B1 EP3329114 B1 EP 3329114B1
Authority
EP
European Patent Office
Prior art keywords
collar
pump
bore
location
adaptor
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
EP16734344.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3329114A1 (en
Inventor
James WILLMOTT
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 EP3329114A1 publication Critical patent/EP3329114A1/en
Application granted granted Critical
Publication of EP3329114B1 publication Critical patent/EP3329114B1/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
    • F02M59/02—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
    • 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
    • F02M39/00—Arrangements of fuel-injection apparatus with respect to engines; Pump drives adapted to such arrangements
    • F02M39/02—Arrangements of fuel-injection apparatus to facilitate the driving of pumps; Arrangements of fuel-injection pumps; Pump drives
    • 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
    • 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
    • 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
    • F04B1/0448—Sealing means, e.g. for shafts or housings
    • 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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines

Definitions

  • the present invention relates generally to the field of high pressure fuel pumps. More particularly, but not exclusively, the present invention concerns engine location spigot adaptor for high pressure diesel fuel pumps.
  • the fuel pump In a high pressure fuel pump, the fuel pump is usually located in relation to a front of the engine block. This is achieved via the location of a spigot (extending from a front plate thereof) into a bore relative to the front of the engine block.
  • the driveshaft passes through the spigot and on the other side of the bore, the driveshaft attaches to a driving gear which rotates the driveshaft in operation.
  • the spigot is retained in position due to the bore adopting a snug fit therearound.
  • the bore and the location spigot of the pump have a fixed diameter of relatively small dimensions, e.g. a spigot with a 50 mm or 68 mm diameter and a bore of similar diameter allowing for clearance.
  • a spigot with a 50 mm or 68 mm diameter and a bore of similar diameter allowing for clearance.
  • such small diameters do not allow assembly of the driving gear to the fuel pump before location of the spigot in the engine block.
  • An adaptor between the location spigot on the pump and the bore of the engine block.
  • An adaptor allows the spigot on the pump to remain small, thereby minimising problems with fixing the pump front plate to the pump housing, whilst accommodating a larger bore in the front of the engine block, thereby providing a diameter enabling assembly of the driving gear to the fuel pump before location in the engine block.
  • FIG. 1 One such prior art adaptor shown in Figure 1 , comprises a loose collar 4 that sits within the bore 2 of the engine block 1 around the spigot 3a of the pump housing 3.
  • the collar 4 comprises a shallow annular design with an outer peripheral o-ring seal 5 located within a groove 6 between the collar 4 and the engine block 1 and an inner o-ring seal 7 between the collar 4 and the spigot 3a.
  • the inner seal 7 is trapped between the collar 4, the spigot 3a and a front plate 3b of the pump seated within a triangular channel 8 cut into an inner rear corner of the collar 4.
  • the seal 7 is partly retained by a small circular segmental annular hollow 9 cut into the diagonal wall of the channel 8.
  • the inner seal 7 When the inner seal 7 is compressed, it applies an axial load to the front plate 3b and collar 4 minimising axial movement of the collar 4 within the bore 2.
  • the depth of the collar 4 and the disposal of the inner seal 7 has to be made such that the front plate 3b can seat against the engine block 1 in order to avoid distortion of pump 3 geometry. However, this in turn causes an axial clearance when the inner seal 7 is compressed, which can cause inner seal 7 fretting and failure.
  • the aim is to provide an engine location spigot adaptor for high pressure diesel fuel pumps able to minimise axial movement within an engine block bore, whilst allowing the pump to be seated against the engine block, and which does not impinge on the function of the 'tell-tale' drilling and hole.
  • a high pressure diesel fuel pump comprising a pump housing, a location spigot protruding from a front plate of the pump, and a driveshaft protruding from the location spigot, the driveshaft being adapted for assembly with a driving gear of an engine and said location spigot being adapted to be located in a bore relative to a front end of an engine block, the pump further comprising an adaptor for location around said location spigot in said bore between the front plate and the engine block, the adaptor comprising a collar, an outer seal for location between the collar and the engine block, and an inner seal for location between the collar and the locaton spigot, characterised in that the adaptor further comprises a spring means adapted to be located at a bottom end of the collar between said collar and the front plate.
  • the adaptor is able to be seated firmly against the engine block to minimise or even eliminate axial movement, which would otherwise lead to seal fretting and failure.
  • the use of the wave spring leaves the leak path open and un-impinged in order to retain the tell-tale function of the pump.
  • the spigot can remain small, thereby minimising problems with fixing the pump front plate to the pump housing, whilst allowing for a larger bore in the front of the engine block, to enable assembly of the driving gear to the driveshaft before location in the engine block.
  • the spring means is configured to apply an axial load to the front plate when compressed. With this arrangement, the spring means forces the adaptor against the engine block minimising axial movement of the pump within the bore.
  • the spring means is adapted to be accommodated substantially within the bottom end of the collar.
  • the collar comprises a recess to accommodate said spring means.
  • the collar comprises a shallow annular design comprising a centrally disposed axial bore therethrough.
  • the recess comprises an annular groove in said collar.
  • the recess communicates with the bore of the collar. Therefore, most preferably, the recess is disposed at a bottom inner corner of said collar open to said bore.
  • the spring means comprises a wave spring.
  • the wave spring comprises a round wire profile.
  • the wave spring comprises a single-turn, e.g. one layer of wire.
  • the wave spring may be configured to provide between approximately 50N and approximately 2000N working load.
  • the wave spring is configured to provide between approximately 700N and approximately 1000N working load, more preferably between approximately 800N and 900N.
  • the inner and outer seals may be located diametrically opposite one another on said collar, e.g. on the same diametric plane.
  • the seals are disposed towards an upper end of the collar.
  • the outer seal comprises an o-ring of suitable sealing material.
  • the outer seal is located within a groove in the outer circumference of the collar.
  • the inner seal comprises an o-ring of suitable sealing material.
  • the inner seal is located within a groove in the location spigot.
  • the inner seal may be located within a groove in the bore of the collar.
  • the collar comprises a main portion of first outer diameter comprising said upper end of the collar.
  • the collar comprises a secondary portion of second larger outer diameter comprising said bottom end of the collar.
  • Figures 2 to 5 show a preferred embodiment of the present invention in which a high pressure diesel fuel pump 20 comprises a pump housing 21, a location spigot 24 protruding from a front plate 23 of the pump 20 and a driveshaft 22 protruding from the location spigot 24, the driveshaft 22 being adapted for assembly with a driving gear 31 of an engine and said location spigot 24 being adapted to be located in a bore 32 relative to a front end of an engine block 30, the pump 20 further comprising an adaptor 40 for location around said location spigot 24 in said bore 32 between the front plate 23 and the engine block 30, the adaptor 40 comprising a collar 43, an outer seal 45 for location between the collar 43 and the engine block 30, and an inner seal 47 for location between the collar 43 and the location spigot 24, characterised in that the adaptor 40 further comprises a spring means 49 adapted to be located at a bottom end 41 of the collar 43 between said collar 43 and the front plate 23.
  • the adaptor 40 comprises a substantially annular collar 43 with a centrally-disposed axial through-bore 46.
  • the collar 43 comprises aluminium to minimise mass and reduce the load demand on the spring means 49.
  • the collar 43 comprises a first bottom end 41 which sits close to the pump housing 21 and a second upper end 42.
  • the collar 43 comprises a main portion 43a of a first external diameter encompassing the upper end 42 and a shallow secondary portion 43b of a second larger external diameter encompassing the bottom end 41. This provides a stepped outer profile to the collar 43 between the bottom end 41 and the upper end 42.
  • the engine block 30 is adapted to receive the stepped outer profile of the adaptor 40 by comprising a secondary bore 32b concentric with the primary bore 32a and of larger diameter to accommodate the outer diameter of the secondary portion 43b.
  • the main portion 43a of the collar 43 comprises an outer circumferential groove 44 disposed near to the upper end 42 for accommodating the outer seal 45.
  • the outer seal 45 comprises an o-ring of suitable sealing material that is held within the groove 44 in order to provide a sealing interface between the collar 43 and bore 32 of the engine block 30.
  • the bore 46 comprises a substantially straight and un-profiled internal wall 46a.
  • the bore 46 comprises a profiled internal wall 46b.
  • the secondary portion 43b of the collar 43 comprises an inner circumferential recess 48 disposed within the bore 46 and open to the bottom end 41 of the collar 43.
  • the recess 48 comprises a substantially square profile in cross-section. Where the recess 48 re-joins the internal wall 46b of the bore 46, the recess 48 comprises a short, steep tapered section 51, configured to provide a short conical portion and a diminishing gap 61 between the location spigot 24 and the internal wall 46b.
  • the recess 48 comprises a second short, outwardly tapered section 52, configured to provide a short shallow conical portion and a wider mouth 62 between the front plate 23 and the bottom end 41 of the adaptor 40.
  • the mouth 62, recess 48 and gap 61 work together to provide a flow path through the bore 46 between the front plate 23 and the collar 43 up to the point at where the inner seal 47 is located.
  • the spring means 49 comprises a single-turn, round wire wave spring.
  • the wave spring 49 is adapted to be located within the recess 48 of the collar 43. Due to the shape of the recess 48 and the mouth 62 and gap 61, there is a flow path around the spring 49 in any compression state of the spring 49.
  • the inner seal 47 is first located within the groove 25 provided by the location spigot 24.
  • the outer seal 45 is located within the groove 44 of the collar 43 and the wave spring 49 is located within the recess 48 of the collar 43.
  • the adaptor 40 is then assembled on the pump 20, by passing the bottom end 41 over the driveshaft 22 and then over the location spigot 24.
  • the bottom end 41 of the collar 43 is brought close to, but generally does not abut the front plate 23 with the wave spring 49 in uncompressed ('free') form, causing the bottom end 41 to stand off of the front plate 23.
  • the collar 43 is machined to have a low clearance fit (10-85 microns diametrically) around the location spigot 24 of the pump 20. This helps to reduce eccentricity errors that could be detrimental to the drivetrain of the pump 20.
  • the pressure provided by the outer seal 45 and the inner seal 47 aids in keeping the adaptor 40 concentric within the engine block bore 32 and the location spigot 24 concentric within the adaptor 40 bore 46.
  • the adaptor is held in position on the front plate 23 due to the friction between the inner seal 47 and the collar 43 and the groove 25.
  • the driveshaft 22 can then be assembled with the driving gear 31.
  • the driving gear 31 can then be passed through the bore 32 of the front end of the engine block 30, followed by the driveshaft 22.
  • the adaptor 40 and encompassed location spigot 24 pass into the bore 32, until the secondary portion 43b of the collar 43 abuts an upper wall of the secondary bore 32b.
  • the pump 20-adaptor 40 assembly is then mounted on the engine block 30 by engaging and tightening bolts (not shown). This pulls the front plate 23 of the pump 20 closer to the bottom end 41 of the adaptor 40 and compresses the wave spring 49.
  • the adaptor 40 is then captive between the engine block 30 and the front plate 24 within the engine block bore 32 and does not need to be bolted itself to the pump 20 or the engine block 30.
  • the mouth 62 and the gap 61 as part of the recess 48 around the wave spring 49 are in communication with one another around the wave spring 49, which maintains the tell-tale leak path.
  • the adaptor 40 is space efficient and quick to install when compared with prior art adaptors, since it does not require separate bolting to the pump 20 or the engine block 30, and the collar 43 of the adaptor is instead retained on the location spigot 24 during pre-assembly via the inner seal 47. Furthermore, the wave spring 49 is capable of provide higher axial loading, which reduces the risk of seal fretting and failure. Finally, the tell-tale leak path is maintained since the wave spring 49 does not provide a block at the bottom end 41 of the adaptor 40.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Rotary Pumps (AREA)
  • Fuel-Injection Apparatus (AREA)
EP16734344.1A 2015-07-28 2016-06-30 High pressure fuel pump Active EP3329114B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1513226.9A GB201513226D0 (en) 2015-07-28 2015-07-28 High pressure fuel pump
PCT/EP2016/065323 WO2017016787A1 (en) 2015-07-28 2016-06-30 High pressure fuel pump

Publications (2)

Publication Number Publication Date
EP3329114A1 EP3329114A1 (en) 2018-06-06
EP3329114B1 true EP3329114B1 (en) 2019-06-05

Family

ID=54106692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16734344.1A Active EP3329114B1 (en) 2015-07-28 2016-06-30 High pressure fuel pump

Country Status (5)

Country Link
EP (1) EP3329114B1 (zh)
KR (1) KR102569737B1 (zh)
CN (1) CN108026878B (zh)
GB (1) GB201513226D0 (zh)
WO (1) WO2017016787A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10428774B2 (en) * 2015-12-14 2019-10-01 Cummins Inc. Systems for fuel pump adapters and methods of using the same

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176238B (en) * 1985-06-06 1989-04-12 Lucas Ind Plc Mounting arrangement
DE3641769A1 (de) * 1985-12-14 1987-06-19 Volkswagen Ag Antriebsanordnung
JP3965062B2 (ja) * 2002-03-06 2007-08-22 日野自動車株式会社 燃料ポンプ駆動構造
DE102009002558A1 (de) * 2009-04-22 2010-10-28 Robert Bosch Gmbh Verbrennungskraftmaschine
KR101094208B1 (ko) * 2010-03-19 2011-12-14 주식회사 코아비스 스프링의 공용화를 위한 어댑터가 구비된 연료펌프 모듈
CN103266972B (zh) * 2013-05-27 2015-03-25 安徽江淮汽车股份有限公司 一种高压燃油泵驱动结构

Non-Patent Citations (1)

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

Also Published As

Publication number Publication date
CN108026878A (zh) 2018-05-11
EP3329114A1 (en) 2018-06-06
GB201513226D0 (en) 2015-09-09
KR102569737B1 (ko) 2023-08-23
KR20180039089A (ko) 2018-04-17
CN108026878B (zh) 2020-05-01
WO2017016787A1 (en) 2017-02-02

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