EP3841296A1 - Hp pump of a fuel injection system - Google Patents
Hp pump of a fuel injection systemInfo
- Publication number
- EP3841296A1 EP3841296A1 EP19737722.9A EP19737722A EP3841296A1 EP 3841296 A1 EP3841296 A1 EP 3841296A1 EP 19737722 A EP19737722 A EP 19737722A EP 3841296 A1 EP3841296 A1 EP 3841296A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel
- high pressure
- pump
- particles
- inlet
- 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
- 239000000446 fuel Substances 0.000 title claims abstract description 77
- 238000002347 injection Methods 0.000 title claims abstract description 12
- 239000007924 injection Substances 0.000 title claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 33
- 238000002485 combustion reaction Methods 0.000 claims abstract description 7
- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- 238000005086 pumping Methods 0.000 claims description 9
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000000926 separation method 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
- F02M59/46—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
- 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
-
- 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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/27—Fuel-injection apparatus with filters
-
- 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
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/06—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel characterised by the pressurisation of the fuel being caused by centrifugal force acting on the fuel
-
- 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
Definitions
- the present invention relates to a high pressure pump of a fuel injection system of an internal combustion engine with a head member configured to reduce internal leakage issues risk.
- a high pressure (HP) pump for a fuel injection system
- the fuel enters a compression chamber via an inlet wherein it is compressed from a few bars to thousands of bars then is expelled via an outlet.
- HP pump high pressure
- Each movement of each element of the HP pump has therefore to be very precise for the system to work perfectly.
- particles in fuel might strongly disrupt said movements, hence causing malfunctioning of the system.
- a fuel filter is provided to protect the injection system.
- particles of small sizes are not stopped by the filter and penetrate into the injection system.
- some particles come from the injection system itself, whether in the case of a brand new car or as a consequence of an aging of the system.
- a high pressure pump of a fuel injection equipment of an internal combustion engine said pump comprising a head member having a body provided with a bore extending along a pumping axis from an open end to a closed end, said closed end partially defining a compression chamber, a plunger configured to reciprocate within said bore along said pumping axis to alternatively increase and decrease the volume of the compression chamber, a fuel inlet controlled by an inlet valve for allowing, in use, low- pressure fuel into the compression chamber, a fuel outlet controlled by an outlet valve for allowing, in use, high-pressure fuel out of the compression chamber, the body of the high pressure pump head further defining an inlet chamber wherein, in use, fuel at low pressure flows prior to passing through the fuel inlet, said inlet chamber being configured to urge the fuel flows with a rotational movement and, wherein, the body further comprises a particles trap gallery arranged on the outer periphery of said inlet chamber.
- the inlet chamber may comprise a conical base and a fuel entrance, said fuel entrance forming an acute angle with said conical base, and, in use, fuel rotationally flows in the conical base from the fuel entrance, the particles being trapped in the particles trap gallery of the outer periphery by action of a centrifugal force of the rotational movement.
- the particles trap gallery may comprise a space wherein, in use, the particles are trapped.
- the particles trap gallery may comprise a groove disposed in said space.
- the particles trap gallery may comprise lips surrounding said groove.
- a lip may be configured to cooperate with a cap of the head member.
- a width of said lip may correspond to a width of said cap, so that, in use, the lip leans on the cap.
- the lips may be rounded.
- Figure 1 is a perspective view of a head member of a HP pump as per the invention (a cap not being illustrated).
- Figure 2 is an axial view of the head of figure 1.
- Figure 3 is a view of a detail of figure 2.
- 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 on the figures.
- the injection pump is one of the essential parts of the engine.
- the pump is configured to generate a high pressure so that fuel is transmitted to a combustion chamber of the engine.
- the pump 10 has a head member 12 with a body 14 provided with a bore 16 extending along a pumping axis X from an open end (not shown) to a closed end partially defining a compression chamber 18.
- a plunger or piston 20 axially X extending from a first end, not shown, to a second end 22 partially defining the compression chamber 18.
- the first end is configured to cooperate with a rotating cam, not shown.
- the body 14 of the head member 12 further defines an inlet chamber 24 for receiving fuel in the HP pump.
- the inlet chamber 24 is covered by a cap 26 of the head member 11.
- a sealing 28 is disposed between the cap 26 and the inlet chamber 24.
- the inlet chamber 24 comprises a base 30 with a conical shape presenting a downward slope from an outer periphery 32 to its center. Hence, the outer periphery 32 is located at the top of the conical base 30 whereas the center is located at the bottom of the conical base 30. In use, the inlet chamber 24 is fully filled with fuel from the base to the cap 26.
- the body 14 also comprises a fuel entrance 34 exiting into the base 30 disposed close to the center of the base 30.
- the fuel entrance 34 is angled relative to the conical base 30 while not perpendicular to the conical base 30.
- the angle between the conical base 30 and the fuel entrance 34 is strictly acute so that the fuel entering the inlet chamber revolves around an axis line mainly corresponding to the pumping axis X.
- the arrangement of the conical shape of the base 30 and the angled entrance 34 generates a rotational movement of the fuel entering into the inlet chamber 24 through the fuel entrance 34.
- the combination of the downhill conical base with the tilted fuel entrance causes the driving of the fuel around the pumping axis between the fuel entrance 34 and the outer periphery 32.
- the head member 12 further comprises a fuel inlet 36 controlled by an inlet valve 38. As shown in figure 2, the fuel inlet 36 connects the inlet chamber 24 to the compression chamber 18.
- the head member also comprises a fuel outlet 40 controlled by an outlet valve 42.
- the valve 42 is provided with a ball 44 and a spring 46 to maintain the outlet 40 in a closed position illustrated on figure 2.
- the fuel inlet 36 is disposed opposite to outer periphery 32 holding the particles trap 48, i.e. at the center of the bottom of the inlet chamber 24.
- the body 14 comprises a particles trap gallery 48 arranged on the outer periphery 32 of the inlet chamber 24.
- the particles are trapped in the particles trap gallery 48 at the outer periphery 32 because of the difference of density of pure fuel on the one hand and of the fuel contaminating particles on the other hand.
- the particles trap gallery 48 comprises a groove 50 surrounded by a top rounded lip 52 and a bottom rounded lip 54.
- the width of the bottom lip 54 corresponds to the width of the cap 26 such that the lip 54 leans on the cap 26.
- the width of the top lip 52 is smaller than the width of the cap 26 so that there is a space 56 between the cap 26 and the trap 48. As will be detailed later, the particles fall in the space 56 to the groove 50.
- the invention is not limited to the illustrated configuration of the particles trap gallery 48.
- the presence of the space 56 between the outer periphery 32 and the cap 26 might be sufficient for the particles to be trapped.
- the outer periphery may present a shoulder.
- the rounded shape of the lips ensures that assembly is not affected but might not be necessary, in which case the trap 48 can be formed with straight lines.
- 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 18 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 piston reciprocates between BDC and TDC and it varies cyclically the volume of the compression chamber 18 wherein fuel at low pressure enters via the fuel inlet 36 controlled by the inlet valve 38 and exits after being pressurized, via an fuel outlet 40 controlled by the outlet valve 42.
- the trap of the present invention prevents particles from flowing through the head member, reducing the risk of internal leakage issues and protecting the internal combustion engine of the vehicle.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1813540.0A GB2576707B (en) | 2018-08-20 | 2018-08-20 | HP pump of a fuel injection system |
PCT/EP2019/068276 WO2020038646A1 (en) | 2018-08-20 | 2019-07-08 | Hp pump of a fuel injection system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3841296A1 true EP3841296A1 (en) | 2021-06-30 |
EP3841296B1 EP3841296B1 (en) | 2023-08-16 |
Family
ID=63668204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19737722.9A Active EP3841296B1 (en) | 2018-08-20 | 2019-07-08 | Hp pump of a fuel injection system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP3841296B1 (en) |
CN (1) | CN112601886B (en) |
GB (1) | GB2576707B (en) |
WO (1) | WO2020038646A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006045136B3 (en) * | 2006-09-25 | 2007-12-06 | Siemens Ag | Diesel fuel filter device for diesel fuel injection system, has ring channel area formed around inversion, where channel area collects particles from flow of supplied fuel, and particles are filtered through holes |
DE102009000951A1 (en) * | 2009-02-18 | 2010-08-19 | Robert Bosch Gmbh | High-pressure fuel pump for common rail injection system of internal-combustion engine, has piston limiting transport chamber and provided with filler bore leading tangentially into annular space of pump housing |
JP4811496B2 (en) * | 2009-04-16 | 2011-11-09 | 株式会社デンソー | Fuel pump |
US9188120B2 (en) * | 2009-05-22 | 2015-11-17 | Michael Brent Ford | Cyclonic debris evacuation apparatus and method for a pump |
DE102009029582A1 (en) * | 2009-09-18 | 2011-03-24 | Robert Bosch Gmbh | High pressure pump for delivering fuel into combustion chamber of internal combustion engine, is provided with pump element, where fuel in intake stroke of pump piston is drawn from low pressure area over suction valve |
DE102010041498A1 (en) * | 2010-09-28 | 2012-03-29 | Robert Bosch Gmbh | Suction valve for high pressure pump, particularly common rail pump, has axially movable guided valve element, which is operated in closed position with valve seat that is formed in valve plate |
DE102011004274A1 (en) * | 2011-02-17 | 2012-08-23 | Robert Bosch Gmbh | Housing structure for e.g. high pressure pump in fuel injection system of internal combustion engine, has blind bore with collection point which is extended from widening portion at specific angle with respect to bore |
GB201313338D0 (en) * | 2013-07-26 | 2013-09-11 | Delphi Tech Holding Sarl | High Pressure Pump |
GB201518508D0 (en) * | 2015-10-20 | 2015-12-02 | Delphi Internat Operations Luxembourg S À R L | Hydraulic machine with centrifugal particle trap |
GB2549746B (en) * | 2016-04-27 | 2020-04-01 | Delphi Tech Ip Ltd | High pressure fuel pump |
-
2018
- 2018-08-20 GB GB1813540.0A patent/GB2576707B/en active Active
-
2019
- 2019-07-08 EP EP19737722.9A patent/EP3841296B1/en active Active
- 2019-07-08 WO PCT/EP2019/068276 patent/WO2020038646A1/en unknown
- 2019-07-08 CN CN201980054958.XA patent/CN112601886B/en active Active
Also Published As
Publication number | Publication date |
---|---|
GB2576707A (en) | 2020-03-04 |
CN112601886B (en) | 2022-12-20 |
WO2020038646A1 (en) | 2020-02-27 |
CN112601886A (en) | 2021-04-02 |
EP3841296B1 (en) | 2023-08-16 |
GB201813540D0 (en) | 2018-10-03 |
GB2576707B (en) | 2021-05-19 |
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