EP3555453A1 - Cam actuated fuel pump - Google Patents

Cam actuated fuel pump

Info

Publication number
EP3555453A1
EP3555453A1 EP17817711.9A EP17817711A EP3555453A1 EP 3555453 A1 EP3555453 A1 EP 3555453A1 EP 17817711 A EP17817711 A EP 17817711A EP 3555453 A1 EP3555453 A1 EP 3555453A1
Authority
EP
European Patent Office
Prior art keywords
cam
fuel pump
core
recess
bearing
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.)
Granted
Application number
EP17817711.9A
Other languages
German (de)
French (fr)
Other versions
EP3555453B1 (en
Inventor
James McHattie
Karolis SERENAS
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.)
Borgwarner US Technologies LLC
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 EP3555453A1 publication Critical patent/EP3555453A1/en
Application granted granted Critical
Publication of EP3555453B1 publication Critical patent/EP3555453B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/043—Arrangements for driving reciprocating piston-type pumps
    • 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
    • F02M59/02—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
    • 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
    • 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
    • F04B1/0413—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
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the 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
    • F04B9/042—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 the means being cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C9/00—Oscillating-piston machines or pumps
    • F04C9/002—Oscillating-piston machines or pumps the piston oscillating around a fixed axis
    • 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
    • F02M41/00—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor
    • F02M41/08—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined
    • F02M41/14—Fuel-injection apparatus with two or more injectors fed from a common pressure-source sequentially by means of a distributor the distributor and pumping elements being combined rotary distributor supporting pump pistons
    • F02M2041/1438—Arrangements or details pertaining to the devices classified in F02M41/14 and subgroups
    • F02M2041/1494—Details of cams, tappets, rotors, venting means, specially arranged valves, e.g. in the rotor
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • 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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/13—Special devices for making an explosive mixture; Fuel pumps
    • F02M2700/1317—Fuel pumpo for internal combustion engines

Definitions

  • the present invention relates to a fuel pump having a cambox in which a camshaft cooperates with a piston, said camshaft having a cam arrangement minimising the mechanical stresses in the cam or/and in the housing of the cambox.
  • a fuel injection equipment of an internal combustion engine comprises a pump receiving low pressure fuel and delivering high pressure fuel to fuel injectors. Constant efforts are made to increase the outlet fuel pressure toward 3000 bar and above in order to improve combustion and fuel efficiency of the engine and also to decrease the overall size of the pump for enabling easier packaging in the engine compartment of a vehicle. Both trends are detrimental to the pump durability as tending to increase the mechanical stresses internal to the pump.
  • a fuel pump of a fuel injection equipment of an internal combustion engine comprising a camshaft rotating about a main axis in a cambox and cooperating with a piston to reciprocally slide in a bore and alternatively vary the volume of a compression chamber defined in a pumping head.
  • the camshaft comprises a shaft member and a cam member arranged between a rear bearing, registered in a recess of the housing of the cambox and, a front bearing registered in a through bore of a front plate fixed on said housing; the cam being in an inner space defined between said housing and said front plate, said cam having a peripheral outer face, a transverse front side next to the front bearing and a transverse rear side next to the rear bearing.
  • the cam member comprises a core fixed on the shaft and an outer sleeve arranged over the core, the piston cooperating with the outer face of said sleeve, the core being narrower than the sleeve so that an annular recess, is defined on at least one side of the cam.
  • the outer sleeve may be integral to the core.
  • the cam may be integral to the shaft.
  • the core may be integral to the shaft.
  • the outer sleeve may be inserted over the core.
  • the core and the outer sleeve define a front annular recess on the front side of the cam and, a rear annular recess on the rear side of the cam.
  • the cambox may be further provided with a rear annular member surrounding the recess wherein is arranged the rear bearing, said rear annular member being integral to the housing and protruding in the inner space.
  • said rear annular member may be engaged in the rear recess of the cam.
  • the cambox may be further provided with a front annular member surrounding the bore wherein is arranged the front bearing, said front annular member being integral to the front plate and protruding in the inner space S.
  • the front annular member may be engaged in the front recess of the cam.
  • Figure 1 is a section view of a cam actuated pump as per the invention, a camshaft being in a BDC position.
  • Figure 2 is similar to figure 1, the camshaft being in TDC position.
  • Figure 3 is a 3D exploded view of an embodiment of the camshaft.
  • Figure 4 is a 3D view of the camshaft of figure 3 when assembled. DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • a diesel internal combustion engine fueled with direct injection has an injection equipment 10 wherein fuel pressurised by a pump 12 is delivered to injectors.
  • the pump 12 comprises a pumping head fixed onto a cambox 14, a cam 16 of a camshaft 18 rotating about a cam axis X between a front bearing 20 and a rear bearing 22 urges a piston to reciprocally slide in a bore and for varying the volume of a compression chamber defined in the pumping head.
  • the cambox 14 has a housing 24 closed by a front plate 26 which defines an inner space S wherein the cam 16 and a cam follower, provided at an end of the piston, cooperate.
  • the rear bearing 22 is a sleeve registered in a recess 28 arranged in the housing 24 and, the front bearing 20 is another sleeve registered in a through bore 30 arranged in the front plate 26 and, between said bearings, the cam 16 defines a peripheral outer face 32 that is in contact with the cam follower, a transverse front side 34 next to the front bearing 20 and, an opposed transverse rear side 36 next to the rear bearing 22.
  • the embodiment presented on the figures shows a composite camshaft 18 wherein the cam 16 is an independent member inserted with press-fit over a shaft 38 between a cylindrical front bearing face 40 and a cylindrical rear bearing face 42.
  • the cam 16 comprises a central core 44 having an axial X hole 46 complementary engaged over the shaft 38 and, an integral outer sleeve 48 defining said peripheral outer face 32 that is in contact with the cam follower.
  • the cam 16 can be entirely integral to the shaft 38 or, the core 44 only could be integral to the shaft 32, the outer sleeve 48 being an independent member inserted over the core 44 or also, the shaft 38, the core 44 and the outer sleeve 48 can be three distinct members assembled afterward.
  • the design choice depends upon compromised made between, for instance, manufacturing process and material selections.
  • the outer sleeve 48 is larger than the core member 44 and is centred over it thus defining a front recess 50, or front undercut, arranged on the front side 34 of the cam and, an opposed rear recess 52, or rear undercut, arranged on the rear side 36 of the cam, said recesses 50, 52 surrounding the opposed openings of the axial hole 46, the front edge area 54 and the rear edge area 56 of the outer sleeve defining the peripheral wall of the recesses 50, 52.
  • annular rear member 58 integral to the housing 24 surrounds the rear bearing recess 52 and protrudes in the inner space S, said annular member 58 engaging the rear recess 52 of the cam without touching any of the faces of the cam maintaining a gap between the faces of the annular member 58 and the faces of the rear recess 52.
  • annular front member 60 integral to the front plate 26 surrounds the bore 30 and protrudes in the inner space S, said annular member 60 engaging the front recess 50 of the cam without touching the cam maintaining a gap between the faces of the annular member 60 and the faces of the front recess 50.
  • the size of the pump 12 can be decreased by bringing the front plate 26 closer the housing.
  • the front 54 and rear 56 edges of the cam outer sleeve are provided with enhanced resilient properties, said areas being able to slightly deflect under the forces applied on the outer face 32 of the sleeve member by the cam follower.
  • the axial length of the bearings 20, 22 may be increased.
  • the cam 16 can be non-symmetrical, outer sleeve 48 not being centred over the central core 44, this enabling for instance to increase the length of a bearing.

Landscapes

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

Abstract

A fuel pump (12) of a fuel injection equipment (10) comprises a camshaft (18) rotating about a main axis (X) in a cambox (14) and cooperating with a piston. The camshaft (18) comprises a shaft member (38) and a cam member (16) that comprises a core (44) fixed on a shaft (38) and an outer sleeve (48) arranged over the core (44), the piston cooperating with the outer face (32) of said sleeve, the core (44) being narrower than the sleeve (48) so that an annular recess (50, 52) is defined on at least one side of the cam.

Description

CAM ACTUATED FUEL PUMP TECHNICAL FIELD
The present invention relates to a fuel pump having a cambox in which a camshaft cooperates with a piston, said camshaft having a cam arrangement minimising the mechanical stresses in the cam or/and in the housing of the cambox.
BACKGROUND OF THE FNVENTION
A fuel injection equipment of an internal combustion engine comprises a pump receiving low pressure fuel and delivering high pressure fuel to fuel injectors. Constant efforts are made to increase the outlet fuel pressure toward 3000 bar and above in order to improve combustion and fuel efficiency of the engine and also to decrease the overall size of the pump for enabling easier packaging in the engine compartment of a vehicle. Both trends are detrimental to the pump durability as tending to increase the mechanical stresses internal to the pump.
SUMMARY OF THE FNVENTION
Accordingly, it is an object of the present invention to resolve at least partially the above mentioned problems in providing a fuel pump of a fuel injection equipment of an internal combustion engine, said pump comprising a camshaft rotating about a main axis in a cambox and cooperating with a piston to reciprocally slide in a bore and alternatively vary the volume of a compression chamber defined in a pumping head.
Furthermore, the camshaft comprises a shaft member and a cam member arranged between a rear bearing, registered in a recess of the housing of the cambox and, a front bearing registered in a through bore of a front plate fixed on said housing; the cam being in an inner space defined between said housing and said front plate, said cam having a peripheral outer face, a transverse front side next to the front bearing and a transverse rear side next to the rear bearing.
The cam member comprises a core fixed on the shaft and an outer sleeve arranged over the core, the piston cooperating with the outer face of said sleeve, the core being narrower than the sleeve so that an annular recess, is defined on at least one side of the cam.
In another aspect of the invention, the outer sleeve may be integral to the core.
In another aspect of the invention, the cam may be integral to the shaft.
In another aspect of the invention, the core may be integral to the shaft. In another aspect of the invention, the outer sleeve may be inserted over the core.
In another aspect of the invention, the core and the outer sleeve define a front annular recess on the front side of the cam and, a rear annular recess on the rear side of the cam.
In another aspect of the invention, the cambox may be further provided with a rear annular member surrounding the recess wherein is arranged the rear bearing, said rear annular member being integral to the housing and protruding in the inner space.
In another aspect of the invention, said rear annular member may be engaged in the rear recess of the cam.
In another aspect of the invention, the cambox may be further provided with a front annular member surrounding the bore wherein is arranged the front bearing, said front annular member being integral to the front plate and protruding in the inner space S.
In another aspect of the invention, the front annular member may be engaged in the front recess of the cam. BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which:
Figure 1 is a section view of a cam actuated pump as per the invention, a camshaft being in a BDC position.
Figure 2 is similar to figure 1, the camshaft being in TDC position.
Figure 3 is a 3D exploded view of an embodiment of the camshaft. Figure 4 is a 3D view of the camshaft of figure 3 when assembled. DESCRIPTION OF THE PREFERRED EMBODIMENTS
A diesel internal combustion engine fueled with direct injection has an injection equipment 10 wherein fuel pressurised by a pump 12 is delivered to injectors. The pump 12 comprises a pumping head fixed onto a cambox 14, a cam 16 of a camshaft 18 rotating about a cam axis X between a front bearing 20 and a rear bearing 22 urges a piston to reciprocally slide in a bore and for varying the volume of a compression chamber defined in the pumping head. The cambox 14 has a housing 24 closed by a front plate 26 which defines an inner space S wherein the cam 16 and a cam follower, provided at an end of the piston, cooperate. The rear bearing 22 is a sleeve registered in a recess 28 arranged in the housing 24 and, the front bearing 20 is another sleeve registered in a through bore 30 arranged in the front plate 26 and, between said bearings, the cam 16 defines a peripheral outer face 32 that is in contact with the cam follower, a transverse front side 34 next to the front bearing 20 and, an opposed transverse rear side 36 next to the rear bearing 22.
The embodiment presented on the figures shows a composite camshaft 18 wherein the cam 16 is an independent member inserted with press-fit over a shaft 38 between a cylindrical front bearing face 40 and a cylindrical rear bearing face 42. The cam 16 comprises a central core 44 having an axial X hole 46 complementary engaged over the shaft 38 and, an integral outer sleeve 48 defining said peripheral outer face 32 that is in contact with the cam follower.
In alternative constructional combinations not shown, the cam 16 can be entirely integral to the shaft 38 or, the core 44 only could be integral to the shaft 32, the outer sleeve 48 being an independent member inserted over the core 44 or also, the shaft 38, the core 44 and the outer sleeve 48 can be three distinct members assembled afterward. The design choice depends upon compromised made between, for instance, manufacturing process and material selections.
Whatever the embodiment, the outer sleeve 48 is larger than the core member 44 and is centred over it thus defining a front recess 50, or front undercut, arranged on the front side 34 of the cam and, an opposed rear recess 52, or rear undercut, arranged on the rear side 36 of the cam, said recesses 50, 52 surrounding the opposed openings of the axial hole 46, the front edge area 54 and the rear edge area 56 of the outer sleeve defining the peripheral wall of the recesses 50, 52. Moreover, an annular rear member 58 integral to the housing 24 surrounds the rear bearing recess 52 and protrudes in the inner space S, said annular member 58 engaging the rear recess 52 of the cam without touching any of the faces of the cam maintaining a gap between the faces of the annular member 58 and the faces of the rear recess 52. Symmetrically, an annular front member 60 integral to the front plate 26 surrounds the bore 30 and protrudes in the inner space S, said annular member 60 engaging the front recess 50 of the cam without touching the cam maintaining a gap between the faces of the annular member 60 and the faces of the front recess 50.
Said arrangement enables several pump embodiment each providing solution to at least one of the known issues. For instance, the size of the pump 12 can be decreased by bringing the front plate 26 closer the housing. Also the front 54 and rear 56 edges of the cam outer sleeve are provided with enhanced resilient properties, said areas being able to slightly deflect under the forces applied on the outer face 32 of the sleeve member by the cam follower. Moreover, thanks to the front 60 and rear 58 annular members the axial length of the bearings 20, 22 may be increased.
In yet another embodiment, the cam 16 can be non-symmetrical, outer sleeve 48 not being centred over the central core 44, this enabling for instance to increase the length of a bearing.
LIST OF REFERENCES
X main axis
s inner space
10 injection equipment
12 pump
14 cambox
16 cam
18 camshaft
20 front bearing
22 rear bearing
24 cambox housing
26 front plate
28 recess
30 bore 32 peripheral outer face of the cam
34 front side of the cam
36 rear side of the cam
38 shaft
40 front bearing face
42 rear bearing face
44 central core
46 axial hole
48 outer sleeve
50 front recess
52 rear recess
54 front edge area of the outer sleeve
56 rear edge area of the outer sleeve
58 annular rear member
60 annular front member

Claims

CLAIMS:
1. Fuel pump (12) of a fuel injection equipment (10) of an internal combustion engine, said pump (12) comprising a camshaft (18) rotating about a main axis (X) in a cambox (14) and cooperating with a piston to reciprocally slide in a bore and alternatively vary the volume of a compression chamber defined in a pumping head,
the camshaft (18) comprising a shaft member (38) and a cam member (16) arranged between a rear bearing (42), registered in a recess (28) of the housing (24) of the cambox (14) and, a front bearing (20) registered in a through bore (30) of a front plate (26) fixed on said housing (24); the cam (16) being in an inner space (S) defined between said housing (24) and said front plate (26), said cam (16) having a peripheral outer face (32), a transverse front side (34) next to the front bearing (20) and a transverse rear side (36) next to the rear bearing (22), characterised in that
the cam member (16) comprises a core (44) fixed on the shaft (38) and an outer sleeve (48) arranged over the core (44), the piston cooperating with the outer face (32) of said sleeve, the core (44) being narrower than the sleeve (48) so that an annular recess (50, 52) is defined on at least one side of the cam.
2. Fuel pump (12) as claimed in the preceding claim wherein the outer sleeve (48) is integral to the core (44).
3. Fuel pump (12) as claimed in claim 2 wherein the cam (16) is integral to the shaft (38).
4. Fuel pump (12) as claimed in any on the claims 1 or 2 wherein the core (44) is integral to the shaft (38).
5. Fuel pump (12) as claimed in claim 4 wherein the outer sleeve (48) is inserted over the core (44).
6. Fuel pump (12) as claimed in any of the preceding claims wherein the core (44) and the outer sleeve (48) define a front annular recess (50) on the front side (34) of the cam and, a rear annular recess (52) on the rear side (42) of the cam.
7. Fuel pump (12) as claimed in claim 6 wherein the cambox (14) is further provided with a rear annular member (58) surrounding the recess (28) wherein is arranged the rear bearing (22), said rear annular member (58) being integral to the housing (24) and protruding in the inner space (S).
8. Fuel pump (12) as claimed in claim 7 wherein said rear annular member (58) is engaged in the rear recess (52) of the cam.
9. Fuel pump (12) as claimed in any of the claims 6 to 8 wherein the cambox (14) is further provided with a front annular member (60) surrounding the bore (30) wherein is arranged the front bearing (20), said front annular member (60) being integral to the front plate (26) and protruding in the inner space (S).
10. Fuel pump (12) as claimed in claim 9 wherein the front annular member (54) is engaged in the front recess (50) of the cam.
EP17817711.9A 2016-12-13 2017-12-11 Cam actuated fuel pump Active EP3555453B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1621185.6A GB2557630A (en) 2016-12-13 2016-12-13 Cam actuated fuel pump
PCT/EP2017/082291 WO2018108843A1 (en) 2016-12-13 2017-12-11 Cam actuated fuel pump

Publications (2)

Publication Number Publication Date
EP3555453A1 true EP3555453A1 (en) 2019-10-23
EP3555453B1 EP3555453B1 (en) 2021-02-17

Family

ID=58221999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17817711.9A Active EP3555453B1 (en) 2016-12-13 2017-12-11 Cam actuated fuel pump

Country Status (4)

Country Link
EP (1) EP3555453B1 (en)
CN (1) CN110291287B (en)
GB (1) GB2557630A (en)
WO (1) WO2018108843A1 (en)

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CN204038427U (en) * 2014-09-02 2014-12-24 广州元新机械设备有限公司 Magnetic force driving pump and stainless steel transmission shaft thereof
DE102014220384B4 (en) * 2014-10-08 2021-02-18 Vitesco Technologies GmbH High pressure fuel pump and drive shaft
US10677119B2 (en) * 2016-03-01 2020-06-09 Cummins Inc. Systems and methods for reducing the oil volume and windage in fuel pumps

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CN110291287A (en) 2019-09-27
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GB201621185D0 (en) 2017-01-25
EP3555453B1 (en) 2021-02-17
GB2557630A (en) 2018-06-27

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