EP3365550A1 - Hydraulic machine with centrifugal particle trap - Google Patents

Hydraulic machine with centrifugal particle trap

Info

Publication number
EP3365550A1
EP3365550A1 EP16781473.0A EP16781473A EP3365550A1 EP 3365550 A1 EP3365550 A1 EP 3365550A1 EP 16781473 A EP16781473 A EP 16781473A EP 3365550 A1 EP3365550 A1 EP 3365550A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic machine
shaft
retaining member
particle trap
fluid
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
EP16781473.0A
Other languages
German (de)
French (fr)
Other versions
EP3365550B1 (en
Inventor
Matthew Fairbairn
Paul F. Garland
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 EP3365550A1 publication Critical patent/EP3365550A1/en
Application granted granted Critical
Publication of EP3365550B1 publication Critical patent/EP3365550B1/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
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/20—Filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34436—Features or method for avoiding malfunction due to foreign matters in oil
    • 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
    • F02M2200/27—Fuel-injection apparatus with filters

Definitions

  • the present invention relates to a hydraulic machine provided with a particle trap.
  • the sources or abrasive debris are built-in or generated by wear and are in suspension from the fuel in the tank. Respectively, these are traditionally minimised by adequate washing and clean room assembly or designing to minimise wear, and providing paper-type filters as part of the system which are changed according to a maintenance schedule.
  • a hydraulic machine comprising a shaft, rotating about a rotational axis and a fluid circuit for circulation of a fluid around said shaft, the fluid being, in use when the shaft is rotating, radially outwardly centrifuged.
  • the hydraulic machine is further provided with a particle trap fixed to the shaft, said particle trap being arranged in the fluid circuit and being adapted to capture and retain particles flowing in the fluid.
  • the particle trap comprises a trap housing fixed to the shaft, said trap housing defining a blind hole open in the fluid circuit and outwardly extending from the opening in the fluid circuit toward a blind end.
  • the particle trap further comprises a retaining member arranged inside the blind hole and defining a lower chamber, between the through opening in the fluid circuit and the retaining member and, an upper chamber between the retaining member and the blind end.
  • the retaining member is provided with an orifice so that, in use particles flowing in the fluid are outwardly centrifuged and enter the lower chamber then pass through the orifice to enter the upper chamber where they are trapped and retained.
  • the retaining member is shaped having a concave side arranged toward the lower chamber and, the concave shape has a pointy tip, the through opening being arranged at said tip.
  • the retaining member protrudes inside the upper chamber therein creating a trap for particles.
  • the shaft is a composite camshaft comprising a cylindrical shaft over which is fixedly engaged a cam member.
  • the particle trap is arranged in said cam member, the blind hole extending in the cam member and opening in the inner cylindrical face of the cam member.
  • the retaining member is fixed inside said blind hole.
  • the retaining member is snapped in the hole.
  • the machine is a fuel pump provided with a cam box having a housing defining an internal volume in which rotates, in use, the composite camshaft actuating a pumping unit.
  • the particle trap is a hole drilled in the cam member.
  • Figure 1 is an axial section of a high pressure fuel pump provided with a particle trap.
  • Figure 2 is a magnified section of the particle trap of figure 1.
  • the fuel pump 10 is of a cambox type and it comprises a housing 12 defining an internal volume V wherein is arranged a camshaft 14 rotating about a rotational axis Al between bearings 16 and, a pumping unit 18 operating about a pumping axis A2 perpendicular to the rotational axis Al .
  • the camshaft 14 is of the type known by the skilled person as a composite camshaft comprising a cylindrical shaft 15 over which is fixedly engaged a cam member 20 having an outer profiled face 22 and an inner cylindrical face 24 engaged over the shaft 15 and fixed onto it.
  • the pumping unit 18 comprises a pumping head 26 having a housing 28 provided with an axial A2 bore 30 wherein is slidably arranged a plunger 32 protruding outside the pumping head housing 28 and extending toward an end provided with a cam follower 34 permanently in contact with the outer profiled face 22 of the cam.
  • a spring 36 arranged around the plunger 32 is compressed between the head housing 28 and a spring seat 38 fixed to the plunger 32, the spring 36 generating a force permanently biasing the cam follower 34 onto the cam member 20.
  • the bore 30 further defines between a blind end of the bore and an extremity of the plunger a compression chamber 40 having an inlet 42 for low pressure fuel to enter and an outlet 44 for high pressure fuel to exit.
  • the circulation circuit 46 within which flows said low pressure fuel F comprises a space S comprised between the end of the camshaft 14 and the housing 12, said space S being represented on the left of figure 1, the circuit 46 further comprises a first conduit 48 axially Al drilled inside the camshaft 14, opening in said space S and extending toward an end defining a T-junction 50 wherefrom depart radial channels 52, two being represented on the figure but more could be arranged, opening in grooves 54 provided on the peripheral cylindrical face of the cylindrical shaft 15.
  • the grooves 54 extend in the axial direction Al below the cam member 20, the right end of the groove 54, as per the arbitrary orientation of the figure, is closed while the left extremity extends beyond the cam member 20 and enables fluid communication with an upper portion UV of the internal volume V, said fluid communication being ensured through a clearance laterally comprised between the cam member 20 and the housing 12.
  • the fuel circulation circuit 46 further comprises particle traps 56, two being represented on the figure, although only one or more than two could be arranged.
  • Said particle trap 56 visible on figure 1 and detailed on figure 2, comprises a blind hole 58 drilled in the cam member 20 and opening in the inner cylindrical face 24.
  • the blind hole 58 is drilled at an angle of approximately 45° relative to the axes Al or A2 in order to enable the manufacturing operation and passage of the drill.
  • the cam member 20 is arranged on the shaft 15 so the bling hole 58 opens in a groove 54 of the circulation circuit 46.
  • a retaining member 60 Inside the blind hole 58 is arranged a retaining member 60 so that the internal space of the blind hole is divided in a lower chamber LC, extending between the opening of the blind hole 58 in the groove 54 and the retaining member 60 and, an upper chamber UC between the retaining member 60 and the blind end of the hole 58.
  • the particle trap 56 can be independent from the cam member 20.
  • the trap 56 can comprise its own trap housing provided with the blind hole 58 Consequently, it is important for the trap to operate to be arranged so the dense debris particles are subject to centrifuge effect so that they pass into the trap 56.
  • the retaining member 60 has an ogive shape, a dome shape or a conical shape are also possible alternatives, and it is arranged in the blind hole 58 so that the lower chamber LC is concave and the upper chamber UC is convex.
  • the wall of the retaining member is provided with a through orifice 62 arranged at the top of the ogive shape, said orifice 62 creating a permanent fluid communication between the lower LC and the upper UC chambers.
  • the retaining member 60 is provided on its external face with an annular crown 64 that is complementary engaged in a peripheral annular groove 66 provided on the peripheral face of the blind hole 58.
  • Said engagement ensures the fixation of the retaining member 60 inside the hole 58.
  • Modes of fixation alternative to the snap-in shown on the figures are possible, for instance gluing, brazing, should materials allow such process, are possible.
  • the snap-in shown enables the retaining member 60 to be a plastic moulded part easily deformable to engage it inside the hole 58 until the crown 64 snaps, or clips, in the groove 66. It is desired that the retaining member 60 seals in the blind hole 58 reasonably well to prevent particles from 'leaking' back into the flow path when the pump is stationary.
  • the camshaft 14 rotates and the fuel flows in the circulation circuit 46 from the space S and inside the first conduit 48 then, the fuel is naturally centrifuged through the radial channels 52 toward the grooves 54.
  • the fuel F may carry undesirable particles P of higher density than the fuel. Said particles P are therefore naturally directed by centrifugal force in the blind hole 58 where the concave face of the retaining member 60 drives said particle toward the orifice 62 enabling the entry of said particle P in the upper chamber UC. Once in there, the particles are trapped and remain permanently inside said convex upper chamber UC.
  • the invention has been disclosed in the context of a high pressure fuel pump but, the particle trap 56 can be successfully implemented in any hydraulic machine wherein a fluid is centrifuged in a flow circuit flows.
  • the method of filtering debris will require centrifugal motion acting on both the fluid and any particles within that fluid, it is not necessary to have a centrifugal motion to move fluid to the location of the filter.
  • the flow of fluid to the centrifugal filter can be achieved by other methods that create a pressure difference between regions of fluid. For instance the trap 60 could be placed in a drilling between two regions of different pressure, but still relying on centrifugal force to trap particles. LIST OF REFERENCES

Abstract

A hydraulic machine comprises a shaft (15) rotating about a rotational axis and a fluid circuit (46) for circulation of a fluid around said shaft (15). In use when the shaft is rotating, the fluid is radially outwardly centrifuged. The hydraulic machine is further provided with a particle trap (56) fixed to the shaft (15), the particle trap (56) being arranged in the fluid circuit (46) and being adapted to capture and retain particles (P) flowing in the fluid.

Description

HYDRAULIC MACHINE WITH CENTRIFUGAL PARTICLE TRAP TECHNICAL FIELD
The present invention relates to a hydraulic machine provided with a particle trap.
BACKGROUND OF THE INVENTION
In fuel injectors, fuel cleanliness is paramount to the successful operation of all fuel injection equipment. Failure to ensure an adequate level of filtration results in deterioration of sensitive parts of the system, including valve seats, guides in the high pressure parts of the pump, drivetrain components and injectors.
The sources or abrasive debris are built-in or generated by wear and are in suspension from the fuel in the tank. Respectively, these are traditionally minimised by adequate washing and clean room assembly or designing to minimise wear, and providing paper-type filters as part of the system which are changed according to a maintenance schedule.
Whilst every effort is made to minimise wear of components downstream of the inlet filter, inevitably, some debris is generated over the lifetime of a pump. This is a particular problem to pumps which include the cambox in the filling circuit. In the prior art 'twin filters' having a second paper filter element are currently used in some heavy duty FIE systems. Said twin- filters re-filter fuel after it has passed through the transfer pump, but this is not applied to pumps which fill from the cambox. The debris generated in the pump downstream of the inlet filter causes further wear.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to resolve the above mentioned problems in providing a hydraulic machine comprising a shaft, rotating about a rotational axis and a fluid circuit for circulation of a fluid around said shaft, the fluid being, in use when the shaft is rotating, radially outwardly centrifuged. The hydraulic machine is further provided with a particle trap fixed to the shaft, said particle trap being arranged in the fluid circuit and being adapted to capture and retain particles flowing in the fluid.
Particularly, the particle trap comprises a trap housing fixed to the shaft, said trap housing defining a blind hole open in the fluid circuit and outwardly extending from the opening in the fluid circuit toward a blind end.
Also, the particle trap further comprises a retaining member arranged inside the blind hole and defining a lower chamber, between the through opening in the fluid circuit and the retaining member and, an upper chamber between the retaining member and the blind end. The retaining member is provided with an orifice so that, in use particles flowing in the fluid are outwardly centrifuged and enter the lower chamber then pass through the orifice to enter the upper chamber where they are trapped and retained.
The retaining member is shaped having a concave side arranged toward the lower chamber and, the concave shape has a pointy tip, the through opening being arranged at said tip.
Also, the retaining member protrudes inside the upper chamber therein creating a trap for particles.
In an embodiment, the shaft is a composite camshaft comprising a cylindrical shaft over which is fixedly engaged a cam member. The particle trap is arranged in said cam member, the blind hole extending in the cam member and opening in the inner cylindrical face of the cam member.
Particularly, the retaining member is fixed inside said blind hole.
In an alternative, the retaining member is snapped in the hole.
More precisely, in a specific application, the machine is a fuel pump provided with a cam box having a housing defining an internal volume in which rotates, in use, the composite camshaft actuating a pumping unit.
In this pump application, the particle trap is a hole drilled in the cam member.
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 an axial section of a high pressure fuel pump provided with a particle trap.
Figure 2 is a magnified section of the particle trap of figure 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The invention is now described in reference to a high pressure fuel pump 10 represented on figure 1 adapted to be arranged on an internal combustion engine in order to deliver high pressure fuel to fuel injectors not represented.
The fuel pump 10 is of a cambox type and it comprises a housing 12 defining an internal volume V wherein is arranged a camshaft 14 rotating about a rotational axis Al between bearings 16 and, a pumping unit 18 operating about a pumping axis A2 perpendicular to the rotational axis Al . The camshaft 14 is of the type known by the skilled person as a composite camshaft comprising a cylindrical shaft 15 over which is fixedly engaged a cam member 20 having an outer profiled face 22 and an inner cylindrical face 24 engaged over the shaft 15 and fixed onto it.
The pumping unit 18 comprises a pumping head 26 having a housing 28 provided with an axial A2 bore 30 wherein is slidably arranged a plunger 32 protruding outside the pumping head housing 28 and extending toward an end provided with a cam follower 34 permanently in contact with the outer profiled face 22 of the cam. A spring 36 arranged around the plunger 32 is compressed between the head housing 28 and a spring seat 38 fixed to the plunger 32, the spring 36 generating a force permanently biasing the cam follower 34 onto the cam member 20. As it is well known, the bore 30 further defines between a blind end of the bore and an extremity of the plunger a compression chamber 40 having an inlet 42 for low pressure fuel to enter and an outlet 44 for high pressure fuel to exit.
In use, fuel F at low pressure circulating in the internal volume V ensures lubrication of the camshaft 14 rotating between the bearings 16 and of the cam follower 34 cooperating with the cam member 20. In a lower portion LV of the internal volume V, the circulation circuit 46 within which flows said low pressure fuel F comprises a space S comprised between the end of the camshaft 14 and the housing 12, said space S being represented on the left of figure 1, the circuit 46 further comprises a first conduit 48 axially Al drilled inside the camshaft 14, opening in said space S and extending toward an end defining a T-junction 50 wherefrom depart radial channels 52, two being represented on the figure but more could be arranged, opening in grooves 54 provided on the peripheral cylindrical face of the cylindrical shaft 15. As visible on the figure, the grooves 54 extend in the axial direction Al below the cam member 20, the right end of the groove 54, as per the arbitrary orientation of the figure, is closed while the left extremity extends beyond the cam member 20 and enables fluid communication with an upper portion UV of the internal volume V, said fluid communication being ensured through a clearance laterally comprised between the cam member 20 and the housing 12.
The fuel circulation circuit 46 further comprises particle traps 56, two being represented on the figure, although only one or more than two could be arranged. Said particle trap 56, visible on figure 1 and detailed on figure 2, comprises a blind hole 58 drilled in the cam member 20 and opening in the inner cylindrical face 24. As visible on figure 1, although not being mandatory for operation, the blind hole 58 is drilled at an angle of approximately 45° relative to the axes Al or A2 in order to enable the manufacturing operation and passage of the drill. The cam member 20 is arranged on the shaft 15 so the bling hole 58 opens in a groove 54 of the circulation circuit 46. Inside the blind hole 58 is arranged a retaining member 60 so that the internal space of the blind hole is divided in a lower chamber LC, extending between the opening of the blind hole 58 in the groove 54 and the retaining member 60 and, an upper chamber UC between the retaining member 60 and the blind end of the hole 58.
In an alternative embodiment, the particle trap 56 can be independent from the cam member 20. The trap 56 can comprise its own trap housing provided with the blind hole 58 Anyway, it is important for the trap to operate to be arranged so the dense debris particles are subject to centrifuge effect so that they pass into the trap 56.
The retaining member 60 has an ogive shape, a dome shape or a conical shape are also possible alternatives, and it is arranged in the blind hole 58 so that the lower chamber LC is concave and the upper chamber UC is convex. The wall of the retaining member is provided with a through orifice 62 arranged at the top of the ogive shape, said orifice 62 creating a permanent fluid communication between the lower LC and the upper UC chambers. In order to maintain the retaining member 60 in position in the blind hole 58, the retaining member 60 is provided on its external face with an annular crown 64 that is complementary engaged in a peripheral annular groove 66 provided on the peripheral face of the blind hole 58. Said engagement ensures the fixation of the retaining member 60 inside the hole 58. Modes of fixation alternative to the snap-in shown on the figures are possible, for instance gluing, brazing, should materials allow such process, are possible. The snap-in shown enables the retaining member 60 to be a plastic moulded part easily deformable to engage it inside the hole 58 until the crown 64 snaps, or clips, in the groove 66. It is desired that the retaining member 60 seals in the blind hole 58 reasonably well to prevent particles from 'leaking' back into the flow path when the pump is stationary.
In operation, the camshaft 14 rotates and the fuel flows in the circulation circuit 46 from the space S and inside the first conduit 48 then, the fuel is naturally centrifuged through the radial channels 52 toward the grooves 54. The fuel F may carry undesirable particles P of higher density than the fuel. Said particles P are therefore naturally directed by centrifugal force in the blind hole 58 where the concave face of the retaining member 60 drives said particle toward the orifice 62 enabling the entry of said particle P in the upper chamber UC. Once in there, the particles are trapped and remain permanently inside said convex upper chamber UC.
The invention has been disclosed in the context of a high pressure fuel pump but, the particle trap 56 can be successfully implemented in any hydraulic machine wherein a fluid is centrifuged in a flow circuit flows. Furthermore, although the method of filtering debris will require centrifugal motion acting on both the fluid and any particles within that fluid, it is not necessary to have a centrifugal motion to move fluid to the location of the filter. The flow of fluid to the centrifugal filter can be achieved by other methods that create a pressure difference between regions of fluid. For instance the trap 60 could be placed in a drilling between two regions of different pressure, but still relying on centrifugal force to trap particles. LIST OF REFERENCES
V internal volume to the housing
Al rotational axis
A2 pumping axis
S space
LV lower portion of the internal volume
UV upperportion of the internal volume
LC lower chamber
UC upper chamber
F fuel
10 fuel pump - hydraulic machine
12 housing
14 camshaft
15 cylindrical shaft
16 bearings
18 pumping unit
20 cam member
22 outer face
24 inner face
26 pumping head
28 housing of the pumping head
30 bore
32 plunger
34 cam follower
36 spring
38 spring seat
40 compression chamber
42 inlet
44 outlet
46 circulation circuit
48 first conduit
50 T-junction
52 radial channels
54 groove
56 particle trap
58 blind hole
60 retaining member
62 orifice
64 crown
66 annular groove.

Claims

CLAIMS:
1. Hydraulic machine (10) comprising a shaft (14, 15) rotating about a rotational axis (Al) and a fluid circuit (46) for circulation of a fluid (F) around said shaft (14, 15), the fiuid being, in use when the shaft is rotating, radially outwardly centrifuged,
characterized in that
the hydraulic machine (10) is further provided with a particle trap (56) fixed to the shaft (14, 15), said particle trap (56) being arranged in the fluid circuit (46) and being adapted to capture and retain particles (P) flowing in the fluid (F) and wherein,
the particle trap (56) comprises a trap housing fixed to the shaft (14, 15), said trap housing defining a blind hole (58) open in the fluid circuit (46) and outwardly extending from the opening in the fluid circuit toward a blind end, the particle trap (56) further comprising a retaining member (60) arranged inside the blind hole (58) and defining a lower chamber (LC), between the through opening in the fluid circuit and the retaining member (60) and, an upper chamber (UC) between the retaining member (60) and the blind end, the retaining member (60) being provided with an orifice (62) so that, in use particles (P) flowing in the fluid (F) are outwardly centrifuged and enter the lower chamber (LC) then pass through the orifice (62) enter the upper chamber (UC) where they are trapped and retained and wherein,
the retaining member (60) is shaped having a concave side arranged toward the lower chamber (LC).
2. Hydraulic machine (10) as claimed in claim 1 wherein said concave shape has a pointy tip, the through opening (62) being arranged at said tip.
3. Hydraulic machine (10) as claimed in any of the claims 1 or 2 wherein the retaining member (60) protrudes inside the upper chamber (UC) therein creating a trap for particles (P).
4. Hydraulic machine (10) as claimed in claim 3 wherein the shaft is a composite camshaft (14) comprising a cylindrical shaft (15) over which is fixedly engaged a cam member (20), the particle trap (56) being arranged in said cam member (20), the blind hole (58) extending in the cam member (20) and opening in the inner cylindrical face (24) of the cam member (20).
5. Hydraulic machine (10) as claimed in claim 4 wherein the retaining member (60) is fixed inside said blind hole (58).
6. Hydraulic machine (10) as claimed in claim 5 wherein the retaining member (60) is snapped in the hole (58).
7. Hydraulic machine (10) as claimed claim 6 wherein the machine is a fuel pump provided with a cam box having a housing (12) defining an internal volume (V) in which rotates, in use, the composite camshaft (14) actuating a pumping unit (18).
8. Hydraulic machine (10) as claimed in claim 7 wherein the particle trap (56) is a hole drilled in the cam member (20).
EP16781473.0A 2015-10-20 2016-10-14 Hydraulic machine with centrifugal particle trap Active EP3365550B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1518508.5A GB201518508D0 (en) 2015-10-20 2015-10-20 Hydraulic machine with centrifugal particle trap
PCT/EP2016/074741 WO2017067856A1 (en) 2015-10-20 2016-10-14 Hydraulic machine with centrifugal particle trap

Publications (2)

Publication Number Publication Date
EP3365550A1 true EP3365550A1 (en) 2018-08-29
EP3365550B1 EP3365550B1 (en) 2019-12-11

Family

ID=55131281

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16781473.0A Active EP3365550B1 (en) 2015-10-20 2016-10-14 Hydraulic machine with centrifugal particle trap

Country Status (3)

Country Link
EP (1) EP3365550B1 (en)
GB (1) GB201518508D0 (en)
WO (1) WO2017067856A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2564654A (en) * 2017-07-17 2019-01-23 Delphi Int Operations Luxembourg Sarl High pressure fuel pump
GB2576707B (en) * 2018-08-20 2021-05-19 Delphi Tech Ip Ltd HP pump of a fuel injection system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3353444B2 (en) * 1994-03-23 2002-12-03 株式会社デンソー Fuel injection pump
DE502005003893D1 (en) * 2004-07-30 2008-06-12 Schaeffler Kg Ring filter for annular grooves
DE102005014680A1 (en) * 2005-02-03 2006-08-10 Mahle International Gmbh Camshaft with mutually rotatable cam for motor vehicles in particular
DE202005020012U1 (en) * 2005-12-22 2007-05-10 Hengst Gmbh & Co.Kg Centrifuge for cleaning a liquid
IT1398728B1 (en) * 2009-04-17 2013-03-18 Bosch Gmbh Robert LUBRICATION CIRCUIT FOR A HIGH PRESSURE COMMON RAIL PUMP AND HIGH PRESSURE COMMON RAIL PUMP

Also Published As

Publication number Publication date
WO2017067856A1 (en) 2017-04-27
GB201518508D0 (en) 2015-12-02
EP3365550B1 (en) 2019-12-11

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