WO2023280482A1 - Pump, in particular fuel injection pump - Google Patents
Pump, in particular fuel injection pump Download PDFInfo
- Publication number
- WO2023280482A1 WO2023280482A1 PCT/EP2022/064850 EP2022064850W WO2023280482A1 WO 2023280482 A1 WO2023280482 A1 WO 2023280482A1 EP 2022064850 W EP2022064850 W EP 2022064850W WO 2023280482 A1 WO2023280482 A1 WO 2023280482A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pump
- lifting rod
- stop surface
- cylinder bore
- medium
- Prior art date
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 27
- 238000002347 injection Methods 0.000 title claims abstract description 11
- 239000007924 injection Substances 0.000 title claims abstract description 11
- 230000001050 lubricating effect Effects 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 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
- F02M59/44—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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0448—Sealing means, e.g. for shafts or housings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- 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
- 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
- F04B53/146—Piston-rod guiding arrangements
-
- 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
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
-
- 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
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
Definitions
- the invention relates to a pump, in particular a fuel injection pump.
- Fuel injection pumps are used to supply an internal combustion engine with fuel. With the help of the internal combustion engine, for example, a vehicle can be driven.
- EP 1 722 098 A1 discloses a fuel injection pump with a piston that is guided in a cylinder so that it can move back and forth. Due to the movements of the piston, fuel is sucked into a pump work chamber and then compressed.
- a suitable engine can, for example, comprise a camshaft with a cam on which the piston is supported at its end facing away from the pump working chamber. The rotary movement of the camshaft is then converted into a linear movement of the piston. The provision can be effected with the help of the spring force of a piston spring. Irrespective of the specific design of the engine, the piston must be guided into the engine chamber, which is pressurized with a lubricating medium when the fuel injection pump is in operation. Since fuel is not usually used as a lubricating medium, measures must be taken to ensure media separation. For example, an annular sealing element can be arranged in the area of the guide of the piston.
- the object of the present invention is to reduce the loads on a rod seal used in a pump, in particular in a fuel injection pump, for media separation. As a result, the robustness and thus the service life of the pump should be increased in this way.
- the proposed pump in particular a fuel injection pump, includes a housing part with a cylinder bore in which a lifting rod is accommodated so that it can move back and forth.
- a rod seal is integrated into the cylinder bore for media separation, in particular for separating the fuel as the first medium from a lubricating medium as the second medium.
- the housing part forms a first stop surface which limits the stroke of the lifting rod and which interacts with a second stop surface formed on the lifting rod to form a stop.
- At least one relief groove is formed in at least one stop surface, via which the cylinder bore is connected to a medium-carrying pressure chamber when the lifting rod comes to rest on the stop surface of the housing part.
- a medium that is located between the two stop surfaces can escape into the medium-carrying pressure chamber via the at least one relief groove when the lifting rod reaches the stop.
- the at least one relief groove counteracts the formation of a fluid build-up in the stop area and in front of the rod seal within the cylinder bore.
- the at least one relief groove therefore leads to a Relief of the rod seal. Relieving the rod seal not only increases the life of the seal itself, but also increases the life of the pump.
- the relieving effect of the at least one relief groove increases with the size of the stop surfaces, since the displacement volume also increases with the size of the stop surfaces.
- the stop that the two stop surfaces form together can be a stop that defines an upper or lower dead center of the lifting rod.
- the medium that escapes into the medium-carrying pressure chamber via the at least one relief groove can in particular be the fuel to be injected.
- the at least one relief groove preferably runs radially in relation to a longitudinal axis of the cylinder bore and/or the lifting rod. If the at least one relief groove is formed in the stop surface of the housing part, it preferably runs radially in relation to the longitudinal axis A of the housing part. If the at least one relief groove is formed in the stop surface of the lifting rod, it preferably runs radially in relation to the longitudinal axis A of the lifting rod. Since the lifting rod is ideally aligned coaxially to the cylinder bore, the respective longitudinal axes coincide on a common longitudinal axis A. The radial course of the at least one relief groove corresponds to the shortest connection between the cylinder bore and the media-carrying pressure chamber, so that the medium located between the stop surfaces is at the shortest is displaced away into the pressure chamber.
- a plurality of relief grooves are arranged at the same angular distance from one another, for example in the shape of a cross or star, in at least one of the two stop surfaces.
- the arrangement at the same angular distance from one another leads to a uniform displacement of the medium located in the stop area into the medium-carrying pressure chamber, so that no pressure cushion can build up between the stop surfaces.
- the at least one relief groove can have an angular, for example triangular or quadrangular, trapezoidal or round cross-section.
- the Angular cross-sectional shape has the advantage that it is particularly easy to produce in a material-removing process and allows large flow cross-sections.
- the round cross-sectional shape is above all optimized for flow.
- the stop surface of the lifting rod is formed on an annular collar of the lifting rod, which is formed by a change in diameter of the lifting rod or by a separate body arranged on the lifting rod.
- the annular collar is firmly connected to the lifting rod, so that it can interact with the stop surface of the housing part to form a stop.
- the stop face of the housing part is formed on a plateau surrounding the cylinder bore.
- the at least one relief groove can then be created by a corresponding clearance in the plateau, so that it is easy to produce.
- the plateau preferably has a circular basic shape that is concentric with respect to the cylinder bore. In this way, an annular stop surface surrounding the cylinder bore is created, which has the same width all the way round and is only interrupted by the at least one relief groove.
- the medium-carrying pressure chamber with which the cylinder bore is connected via the at least one relief groove, is acted upon with fuel as the first medium during operation of the pump.
- the stop is therefore preferably arranged on the fuel side of the cylinder bore.
- the fuel can in particular be the fuel to be injected.
- the rod seal integrated into the cylinder bore prevents the fuel in the pressure chamber from mixing with another medium on the other side of the cylinder bore, in particular with a lubricating medium for lubricating an engine of the pump.
- the end of the cylinder bore facing away from the stop surface opens into a pressure chamber which is acted upon by a lubricating medium during operation of the pump.
- the fuel and the lubricating medium can be permanently and safely separated. This is because by providing the at least one relief groove in at least one stop surface, a fluid build-up in front of the rod seal and thus an increased load on the rod seal due to pressure peaks can be avoided.
- FIG. 1 shows a schematic longitudinal section through a pump according to the invention in the area of a rod seal integrated into a cylinder bore for media separation
- FIGS. 1 and 2 shows a schematic plan view of the housing part of the pump of FIGS. 1 and 2 having the cylinder bore
- the pump 1 shown in FIG. 1 can in particular be a fuel injection pump, with the aid of which fuel can be injected into a combustion chamber of an internal combustion engine.
- the pump 1 shown comprises a housing part 2 with a cylinder bore 3 in which a lifting rod 4 is accommodated or guided so that it can move back and forth.
- a first section of the lifting rod 4 dips into a first pressure chamber 9 to which a first medium, for example fuel, is applied when the pump 1 is in operation.
- a second section of the lifting rod 4 dips beyond the cylinder bore 3 into a second pressure chamber 12 which, when the pump 1 is in operation, is acted upon by another medium, for example a lubricating medium.
- a rod seal 5 is integrated into the cylinder bore 3 for reliable media separation.
- the housing part 2 forms a plateau 11 surrounding the cylinder bore 3 with a stop surface 6 which interacts with a stop surface 7 formed on an annular collar 10 of the lifting rod 4 to form a stop. If the lifting rod 4 moves in the direction of the stop while the pump 1 is in operation, fluid may accumulate in the stop area and within the cylinder bore 3 . The pressure peaks that occur lead to a high load on the rod seal 5, so that the sealing effect is endangered. In order to prevent this, the stop face 6 of the housing part 2 has a number of relief grooves 8 which are formed by openings in the plateau 11 . If the lifting rod 4 comes to rest against the stop, medium present between the stop surfaces 6 , 7 can escape into the pressure chamber 9 via the relief grooves 8 .
- the relief grooves 8 can be arranged in a cross shape and each extend radially outwards from the cylinder bore 3 .
- FIG. 2 shows four relief grooves 8 by way of example. However, the number can also be fewer than four, for example two or three, or more than four, for example five or six.
- any groove cross section can be selected. Exemplary embodiments are shown in FIGS. 3a) to 3c), with FIG. 3a) showing a round cross section, FIG. 3b) showing a square cross section and FIG. 3c) showing a trapezoidal cross section.
- the at least one relief groove 8 can also be formed in the stop surface 7 of the annular collar 10 of the lifting rod 4.
- the reference number 7 is therefore given in brackets after the reference number 6.
- the reference number 10 is given in brackets behind the reference number 11 .
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
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020247003655A KR20240026235A (en) | 2021-07-05 | 2022-06-01 | Pumps, especially fuel injection pumps |
CN202280047926.9A CN117616195A (en) | 2021-07-05 | 2022-06-01 | Pump, in particular fuel injection pump |
EP22731211.3A EP4367381A1 (en) | 2021-07-05 | 2022-06-01 | Pump, in particular fuel injection pump |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102021207001.9A DE102021207001A1 (en) | 2021-07-05 | 2021-07-05 | Pump, in particular fuel injection pump |
DE102021207001.9 | 2021-07-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023280482A1 true WO2023280482A1 (en) | 2023-01-12 |
Family
ID=82100135
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2022/064850 WO2023280482A1 (en) | 2021-07-05 | 2022-06-01 | Pump, in particular fuel injection pump |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP4367381A1 (en) |
KR (1) | KR20240026235A (en) |
CN (1) | CN117616195A (en) |
DE (1) | DE102021207001A1 (en) |
WO (1) | WO2023280482A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1722098A1 (en) | 2004-03-05 | 2006-11-15 | Bosch Corporation | Fuel injection pump for internal combustion engine |
JP2009293597A (en) * | 2008-06-09 | 2009-12-17 | Toyota Motor Corp | Fuel pump |
DE102015201444A1 (en) * | 2015-01-28 | 2016-07-28 | Robert Bosch Gmbh | High pressure pump for conveying a medium |
DE102019208445A1 (en) * | 2019-06-11 | 2020-12-17 | Robert Bosch Gmbh | High pressure fuel pump |
-
2021
- 2021-07-05 DE DE102021207001.9A patent/DE102021207001A1/en active Pending
-
2022
- 2022-06-01 EP EP22731211.3A patent/EP4367381A1/en active Pending
- 2022-06-01 KR KR1020247003655A patent/KR20240026235A/en unknown
- 2022-06-01 WO PCT/EP2022/064850 patent/WO2023280482A1/en active Application Filing
- 2022-06-01 CN CN202280047926.9A patent/CN117616195A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1722098A1 (en) | 2004-03-05 | 2006-11-15 | Bosch Corporation | Fuel injection pump for internal combustion engine |
JP2009293597A (en) * | 2008-06-09 | 2009-12-17 | Toyota Motor Corp | Fuel pump |
DE102015201444A1 (en) * | 2015-01-28 | 2016-07-28 | Robert Bosch Gmbh | High pressure pump for conveying a medium |
DE102019208445A1 (en) * | 2019-06-11 | 2020-12-17 | Robert Bosch Gmbh | High pressure fuel pump |
Also Published As
Publication number | Publication date |
---|---|
CN117616195A (en) | 2024-02-27 |
KR20240026235A (en) | 2024-02-27 |
EP4367381A1 (en) | 2024-05-15 |
DE102021207001A1 (en) | 2023-01-05 |
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