EP3635240A1 - Hp pump for diesel injection systems - Google Patents
Hp pump for diesel injection systemsInfo
- Publication number
- EP3635240A1 EP3635240A1 EP18729676.9A EP18729676A EP3635240A1 EP 3635240 A1 EP3635240 A1 EP 3635240A1 EP 18729676 A EP18729676 A EP 18729676A EP 3635240 A1 EP3635240 A1 EP 3635240A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- recess
- pump
- piston
- bore
- compression chamber
- 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
Links
- 238000002347 injection Methods 0.000 title claims abstract description 5
- 239000007924 injection Substances 0.000 title claims abstract description 5
- 239000002283 diesel fuel Substances 0.000 claims abstract description 5
- 230000000295 complement effect Effects 0.000 claims abstract description 4
- 230000006835 compression Effects 0.000 claims description 20
- 238000007906 compression Methods 0.000 claims description 20
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 239000000446 fuel Substances 0.000 claims description 8
- 238000005086 pumping Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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
- F02M59/442—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 means preventing fuel leakage around pump plunger, e.g. fluid barriers
-
- 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
- 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
- F02M59/46—Valves
- F02M59/464—Inlet valves of the check valve 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
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/167—Means for compensating clearance or thermal expansion
-
- 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
- F04B1/0452—Distribution members, e.g. valves
-
- 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
- F04B53/14—Pistons, piston-rods or piston-rod connections
- F04B53/144—Adaptation of piston-rods
-
- 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
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0012—Valves
- F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
- F02M63/0033—Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
- F02M63/0035—Poppet valves, i.e. having a mushroom-shaped valve member that moves perpendicularly to the plane of the valve seat
Definitions
- the present invention relates to a cam actuated high pressure diesel pump and, more precisely to means preventing fuel leakage between the piston and the bore of the pump.
- a cam actuated diesel fuel high pressure pump compresses fuel in a compression chamber defined at the end of a bore and which volume is cyclically varied by a piston guided and reciprocally moving in said bore.
- Fuel enters the compression chamber via an inlet opening arranged at the end of the bore and which is controlled by an inlet valve member aligned with the piston and exits once compressed via an outlet controlled by a check valve.
- TDC top dead centre
- the end of the piston is provided with a recess defining a cylindrical peripheral wall that also radially dilates under pressure inside said recess, compensating the dilation of the bore and keeping the functional clearance minimal.
- this recess helps in reducing the leaks, it also increases the "dead volume" of fuel in the pumping chamber, and this reduces the portion of the swept volume of the pump that can be delivered. This loss of delivery, or volumetric efficiency, may mean that the pump no longer meets the required specification and it will be necessary to increase plunger diameter or stroke to compensate. These changes are undesirable as they increase stress and pump size.
- a high pressure pump adapted to be arranged in a diesel fuel injection system wherein, in use, said HP pump pressurises fuel in a compression chamber defined by a coaxial arrangement of a bore extending along a main axis, a piston guided in the bore and an inlet valve member axially controlling an inlet arranged at the very end of the bore and wherein, the piston is provided with a recess arranged at its end partially defining said compression chamber, said recess defining a peripheral wall and a bottom face and wherein, the inlet valve member is provided with a head member arranged to complementary engage in said recess when the piston reaches the top dead centre (TDC) position.
- TDC top dead centre
- peripheral wall is adapted to radially expand when the piston reaches said TDC.
- the recess is a cylindrical hollow.
- the head member is smaller in dimension than the recess defining between them a clearance of about 0.5 mm.
- Figure 1 is an axial section of a HP pump as per the invention.
- Figure 2 is a detail of figure 1.
- a diesel internal combustion engine is provided with a fuel injection equipment arranged to cyclically spray compressed diesel fuel in its cylinders.
- Said equipment comprises a high pressure pump 10, shown in axial section on figure 1, having a body 12 provided with a bore 14 extending along a main axis X from a closed top end partially defining a compression chamber 16 to an open bottom end.
- a piston 18 axially X extending from a top end 20, also partially defining said compression chamber 16, to a lower end 22 protruding through the bore bottom opening for cooperating with a cam, not shown.
- the cam rotates and imparts to the piston axial X reciprocal displacements defining a pumping cycle between a top dead center position (TDC) where the volume of the compression chamber is minimum and a bottom dead center position (BDC) where said volume is maximum.
- TDC top dead center position
- BDC bottom dead center position
- the fuel enters the compression chamber 16 via an inlet 24 wherein it is compressed to thousands of bars then is expelled via an outlet 26.
- the outlet 26 comprises a channel angularly drilled in the body 12 at about 45° from the main axis X, said channel opening in the upper wall of the compression chamber. Moreover, said channel is controlled by a check valve 28 comprising a ball biased by a spring against a seat face, said check valve 28 opening in use, when, around TDC, the pressure in the compression chamber 16 is high enough to push the ball away from the seating face.
- a check valve 28 comprising a ball biased by a spring against a seat face, said check valve 28 opening in use, when, around TDC, the pressure in the compression chamber 16 is high enough to push the ball away from the seating face.
- Other type of check valves are also known in the art .
- the inlet 24 is aligned to the bore and to the piston and is arranged at the very end of the bore 14 where it is surrounded by an annular seat face 30 defined on the upper wall of the compression chamber. Said inlet 24 is controlled by an inlet valve member 32 cooperating with an electro -magnetic actuator but, in an alternative embodiment the inlet valve member 32 is passive and is only moving under the influence of pressure differences.
- the inlet valve member 32 is a poppet valve type having an elongated stem 34 at an end of which is a head member 36.
- the stem 34 is axially X guided in the body and, the head 36 widens from the stem and protrudes in the compression chamber 16.
- the head 36 defines a sealing face 38 adapted to cooperate with the seat face 30 for opening and closing said inlet 24.
- the top end 20 of the piston is provided with a recess 40 having a depth H40 and an diameter D40, said recess 40 opening in the upper face of said piston and defining a bottom face 42.
- the piston forms a cylindrical peripheral wall 44 which outer face 46 slides against the face of the bore 14 and which inner face 48 is the lateral face of the recess.
- the head 36 of the inlet valve member is a cylindrical member 50 having a lateral face 52 and a transverse end face 54 facing the bottom 42 of the recess.
- Said cylindrical head member 50 deeply extends in the compression chamber 16 and, when the piston 18 is at TDC, as shown on the figure, said cylindrical head member 50 engages in the recess 40 without touching the faces of the recess, said end face 54 of the head remaining at a distance from the bottom 42 of the recess and, the lateral face 52 being also away from the recess lateral face 48.
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
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1709139.8A GB2563263B (en) | 2017-06-08 | 2017-06-08 | HP pump for diesel injection systems |
PCT/EP2018/065097 WO2018224624A1 (en) | 2017-06-08 | 2018-06-07 | Hp pump for diesel injection systems |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3635240A1 true EP3635240A1 (en) | 2020-04-15 |
EP3635240B1 EP3635240B1 (en) | 2021-08-11 |
Family
ID=59358190
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18729676.9A Active EP3635240B1 (en) | 2017-06-08 | 2018-06-07 | Hp pump for diesel injection systems |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3635240B1 (en) |
GB (1) | GB2563263B (en) |
WO (1) | WO2018224624A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2599659B (en) * | 2020-10-07 | 2023-03-29 | Delphi Tech Ip Ltd | Fuel pump |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7610902B2 (en) * | 2007-09-07 | 2009-11-03 | Gm Global Technology Operations, Inc. | Low noise fuel injection pump |
JP5187255B2 (en) * | 2009-03-27 | 2013-04-24 | 株式会社デンソー | High pressure pump |
GB201402528D0 (en) * | 2014-02-13 | 2014-04-02 | Delphi Int Operations Luxembourg Sarl | High pressure fuel pump |
GB201501282D0 (en) * | 2015-01-27 | 2015-03-11 | Delphi International Operations Luxembourg S.�.R.L. | Plunger assembly |
GB201506173D0 (en) * | 2015-04-13 | 2015-05-27 | Delphi Internat Operations Luxembourg S � R L | Fuel pump |
-
2017
- 2017-06-08 GB GB1709139.8A patent/GB2563263B/en active Active
-
2018
- 2018-06-07 EP EP18729676.9A patent/EP3635240B1/en active Active
- 2018-06-07 WO PCT/EP2018/065097 patent/WO2018224624A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
GB2563263A (en) | 2018-12-12 |
EP3635240B1 (en) | 2021-08-11 |
GB2563263B (en) | 2019-06-12 |
WO2018224624A1 (en) | 2018-12-13 |
GB201709139D0 (en) | 2017-07-26 |
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