CN117616195A - Pump, in particular fuel injection pump - Google Patents
Pump, in particular fuel injection pump Download PDFInfo
- Publication number
- CN117616195A CN117616195A CN202280047926.9A CN202280047926A CN117616195A CN 117616195 A CN117616195 A CN 117616195A CN 202280047926 A CN202280047926 A CN 202280047926A CN 117616195 A CN117616195 A CN 117616195A
- Authority
- CN
- China
- Prior art keywords
- pump
- medium
- stop surface
- cylinder bore
- travel bar
- 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.)
- Pending
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 10
- 238000000926 separation method Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000284 resting effect Effects 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
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
The invention relates to a pump (1), in particular a fuel injection pump, comprising a housing part (2) having a cylinder bore (3) in which a stroke rod (4) is received in a reciprocable manner, wherein a rod seal (5) is integrated in the cylinder bore (3) for separating a medium, in particular for separating a fuel as a first medium from a lubricating medium as a second medium. According to the invention, the housing part (2) forms a first stop surface (6) limiting the travel of the travel bar (4), said first stop surface co-acting with a second stop surface (7) formed on the travel bar (4) in such a way as to form a stop, wherein at least one relief groove (8) is formed in at least one stop surface (6, 7), by means of which the cylinder bore (3) is connected to a pressure chamber (9) for guiding a medium when the travel bar (4) is placed against the stop surface (6) of the housing part (2).
Description
Technical Field
The present invention relates to a pump, in particular a fuel injection pump. The fuel injection pump is used to supply fuel to the internal combustion engine. For example, the vehicle can be driven by means of an internal combustion engine.
Background
A fuel injection pump with a piston guided in a cylinder in a reciprocable manner is known, for example, from EP1722098 A1. By the movement of the piston, fuel is sucked into the pump working chamber and then compressed.
The movement of the piston requires a drive mechanism. A suitable drive mechanism may for example comprise a camshaft with a cam on which the piston is supported at its end facing away from the pump working chamber. Then, the rotational movement of the camshaft is converted into a linear movement of the piston. The return can be brought about by means of the spring force of the piston spring. Irrespective of the specific implementation of the drive mechanism, the piston must be guided into a drive mechanism chamber which is acted upon by a lubricating medium during operation of the fuel injection pump. Since fuel is not normally used as a lubricating medium, measures to ensure medium separation must be taken. For example, an annular sealing element can be arranged in the region of the pilot piston. Since the sealing element is dynamically loaded by the movement of the piston, a particularly robust sealing element should be provided. Thus, so-called stem seals are commonly used.
Disclosure of Invention
The present invention is based on the object of reducing the load on a rod seal for medium separation in a pump, in particular in a fuel injection pump. In this way, the robustness and thus the service life of the pump should be increased.
To solve this task, a pump having the features of claim 1 is proposed. Advantageous developments of the invention are known from the dependent claims.
The proposed pump, in particular a fuel injection pump, comprises a housing part having a cylinder bore in which a stroke rod is received in a reciprocable manner. In order to separate the media, in particular the fuel as the first medium from the lubrication medium as the second medium, a rod seal is integrated in the cylinder bore. According to the invention, the housing part forms a first stop surface limiting the travel of the travel bar, which cooperates with a second stop surface formed on the travel bar in such a way as to form a stop. In this case, at least one relief groove is formed in the at least one stop surface, through which the cylinder bore is connected to the pressure chamber for guiding the medium when the travel bar is in contact with the stop surface of the housing part.
When the travel bar reaches the stop, the medium located between the two stop surfaces can escape via the at least one relief groove into the pressure chamber in which the medium is guided. In this way, the at least one relief groove resists the formation of a fluid blockage in the stop region and in front of the rod seal within the cylinder bore. That is, by means of the at least one relief groove, high pressure peaks in the cylinder bore are avoided, which may negatively affect the sealing function and the service life of the rod seal. Thus, the at least one unloading slot results in unloading of the rod seal. Unloading of the rod seal results in not only an increase in the service life of the seal itself, but also an increase in the service life of the pump. Since the drainage volume increases with the size of the stop surface, the unloading effect of the at least one unloading slot also increases with the size of the stop surface.
The stop formed by the two stop surfaces together may be a stop defining the top dead center or bottom dead center of the travel bar. The medium escaping into the pressure chamber of the pilot medium via the at least one relief groove can be in particular the fuel to be injected.
Preferably, the at least one relief groove extends radially with respect to the longitudinal axis of the cylinder bore and/or the travel bar. If the at least one relief groove is formed in the stop surface of the housing part, it preferably extends radially with respect to the longitudinal axis a of the housing part. If the at least one relief groove is embodied in the stop surface of the travel bar, it preferably extends radially with respect to the longitudinal axis a of the travel bar. Since in the ideal case the travel rod is oriented coaxially with the cylinder bore, the respective longitudinal axes fall together on a common longitudinal axis a. The radial extension of the at least one relief groove corresponds to the shortest connection between the cylinder bore and the pressure chamber leading the medium, so that the medium located between the stop surfaces is discharged into the pressure chamber in the shortest path.
Advantageously, a plurality of relief grooves are arranged at the same angular distance from one another in at least one of the two stop surfaces, for example in a cross-shaped or star-shaped arrangement. The arrangement at the same angular distance from one another results in a uniform discharge of the medium located in the stop region into the pressure chamber that guides the medium, so that no pressure cushion can be established between the stop surfaces.
The at least one relief groove may have an angular cross section, for example a triangular or quadrangular cross section, a trapezoidal cross section or a non-angular cross section (rund). The angular cross-sectional shape has the following advantages: which can be produced particularly simply in a material removal process and which enables a large flow cross section. The angular-free cross-sectional shape is primarily flow-optimized.
According to a preferred embodiment of the invention, the stop surface of the travel bar is formed on an annular flange of the travel bar, which is formed by a sudden change in the diameter of the travel bar or by a separate entity arranged on the travel bar. In any case, the annular flange is fixedly connected to the travel bar, so that it can co-act with the stop surface of the housing part in such a way that it forms a stop. The constructed embodiment has the following advantages: the manufacture of the travel bar and the assembly of the pump is simplified.
According to a further preferred embodiment of the invention, the stop surface of the housing part is formed on a platform surrounding the cylinder bore. The at least one unloading slot can then be realized by a corresponding recess (freestellung) in the platform, so that it can be manufactured simply. Preferably, the platform has a circular basic shape, which is arranged concentrically with respect to the cylinder bore. In this way, an annular stop surface surrounding the cylinder bore is achieved, which has the same width in the circumferential direction (umlaufend) and is interrupted only by the at least one relief groove.
Furthermore, it is proposed that the medium-conducting pressure chamber is acted upon by fuel as the first medium during operation of the pump, and that the cylinder bore is connected to the medium-conducting pressure chamber via the at least one relief groove. Therefore, the stopper is preferably arranged on the fuel side of the cylinder bore. The fuel may in particular be the fuel to be injected. The rod seal integrated into the cylinder bore prevents the fuel located in the pressure chamber from mixing with another medium at the other side of the cylinder bore, in particular with the lubricating medium for lubricating the drive mechanism of the pump.
In a further embodiment of the invention, it is therefore provided that the cylinder bore opens at its end facing away from the stop surface into a pressure chamber which is acted upon by a lubricating medium during operation of the pump. By means of the rod seal integrated into the cylinder bore, the fuel and the lubricating medium can be separated permanently and reliably. Since by providing the at least one relief groove in the at least one stop surface, a fluid blockage in front of the rod seal and thus an increase in the load of the rod seal caused by the pressure peaks can be avoided.
Drawings
Preferred embodiments of the present invention will be explained in more detail below with reference to the attached drawings. The drawings show:
fig. 1 shows a schematic longitudinal section of a pump according to the invention in the region of a rod seal for medium separation integrated into a cylinder bore;
FIG. 2 shows a schematic top view of a housing component having cylinder bores of the pump of FIG. 1; and
fig. 3 a) to c) show different cross-sectional shapes of the unloading slot for the pump according to the invention.
Detailed Description
The pump 1 shown in fig. 1 may in particular be a fuel injection pump, by means 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 stroke rod 4 (Hubstange) is received in a reciprocable manner or guided. In this case, the first section of the travel rod 4 is immersed in a first pressure chamber 9, which is acted upon by a first medium, for example fuel, during operation of the pump 1. The second section of the travel rod 4 is immersed on the other side of the cylinder bore 3 in a second pressure chamber 12 which is acted upon by a further medium, for example a lubricating medium, during operation of the pump 1. For reliable medium separation, a rod seal 5 is integrated in the cylinder bore 3.
The housing part 2 forms a platform 11 surrounding the cylinder bore 3, which platform has a stop surface 6 which cooperates with a stop surface 7 formed on an annular flange 10 of the travel rod 4 in such a way that it forms a stop. If the travel rod 4 performs a movement in the direction of the stop during operation of the pump 1, a fluid blockage can occur in the stop region and in the cylinder bore 3. The pressure peaks that occur here lead to high loads on the rod seal 5, so that the sealing effect is impaired. In order to prevent this, the stop surface 6 of the housing part 2 has a plurality of relief grooves 8, which are formed by recesses in the platform 11. If the travel bar 4 is resting against the stop, the medium present between the stop surfaces 6, 7 can escape into the pressure chamber 9 via the relief groove 8.
As is represented by way of example in fig. 2, the relief grooves 8 may be arranged in a cross-shape and each extend radially outwards from the cylinder bore 3. Fig. 2 shows exemplarily four unloading slots 8. However, the number may also be less than four, for example two or three, or more than four, for example five or six. Furthermore, any slot cross section may be selected. Some embodiments are shown in fig. 3 a) to 3 c), wherein fig. 3 a) shows a corner-free cross section, fig. 3 b) shows a quadrangular cross section, and fig. 3 c) shows a trapezoidal cross section.
Instead of the representation in fig. 1 to 3, the at least one relief groove 8 can also be embodied in the stop surface 7 of the annular collar 10 of the travel bar 4. Thus, in fig. 2 and 3, reference numeral 7 is given in brackets after reference numeral 6. Similarly, in fig. 2, reference numeral 10 is given in parentheses after reference numeral 11.
Claims (8)
1. A pump (1), in particular a fuel injection pump, comprising a housing part (2) having a cylinder bore (3) in which a stroke rod (4) is received in a reciprocable manner, wherein a rod seal (5) is integrated in the cylinder bore (3) for medium separation, in particular for separating fuel as a first medium from a lubricating medium as a second medium,
the housing part (2) forms a first stop surface (6) limiting the travel of the travel bar (4), said first stop surface co-acting with a second stop surface (7) formed on the travel bar (4) in such a way as to form a stop, wherein at least one relief groove (8) is formed in at least one stop surface (6, 7), by means of which the cylinder bore (3) is connected to a pressure chamber (9) for guiding a medium when the travel bar (4) is placed against the stop surface (6) of the housing part (2).
2. Pump (1) according to claim 1,
characterized in that the at least one relief groove (8) extends radially with respect to the longitudinal axis (A) of the cylinder bore (3) and/or of the travel rod (4).
3. Pump (1) according to claim 1 or 2,
characterized in that a plurality of relief grooves (8) are arranged at equal angular distances from each other in at least one of the two stop surfaces (6, 7), for example in a cross-shaped or star-shaped arrangement.
4. Pump (1) according to any one of the preceding claims,
characterized in that the at least one relief groove (8) has a prismatic cross-section, a trapezoidal cross-section or a non-prismatic cross-section, the prismatic cross-section being for example a triangular or quadrangular cross-section.
5. Pump (1) according to any one of the preceding claims,
the stop surface (7) of the travel bar (4) is formed on an annular flange (10) of the travel bar (4), which is formed by a sudden change in the diameter of the travel bar (4) or by a separate entity arranged on the travel bar (4).
6. Pump (1) according to any one of the preceding claims,
characterized in that the stop surface (6) of the housing part (2) is formed on a platform (11) surrounding the cylinder bore (3).
7. Pump (1) according to any one of the preceding claims,
characterized in that the medium-conducting pressure chamber (9) is acted upon by fuel as a first medium during operation of the pump (1), and the cylinder bore (3) is connected to the medium-conducting pressure chamber via the at least one relief groove (8).
8. Pump (1) according to any one of the preceding claims,
characterized in that the cylinder bore (3) opens at its end facing away from the stop surface (6) into a pressure chamber (12) which is acted upon by a lubricating medium during operation of the pump (1).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021207001.9 | 2021-07-05 | ||
| DE102021207001.9A DE102021207001A1 (en) | 2021-07-05 | 2021-07-05 | Pump, in particular fuel injection pump |
| PCT/EP2022/064850 WO2023280482A1 (en) | 2021-07-05 | 2022-06-01 | Pump, in particular fuel injection pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117616195A true CN117616195A (en) | 2024-02-27 |
Family
ID=82100135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280047926.9A Pending CN117616195A (en) | 2021-07-05 | 2022-06-01 | Pump, in particular fuel injection pump |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4367381A1 (en) |
| JP (1) | JP2024522883A (en) |
| KR (1) | KR20240026235A (en) |
| CN (1) | CN117616195A (en) |
| DE (1) | DE102021207001A1 (en) |
| WO (1) | WO2023280482A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4098738B2 (en) | 2004-03-05 | 2008-06-11 | ボッシュ株式会社 | Fuel injection pump for internal combustion engines |
| JP4825842B2 (en) * | 2008-06-09 | 2011-11-30 | トヨタ自動車株式会社 | 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 JP JP2023579491A patent/JP2024522883A/en active Pending
- 2022-06-01 WO PCT/EP2022/064850 patent/WO2023280482A1/en active Application Filing
- 2022-06-01 KR KR1020247003655A patent/KR20240026235A/en unknown
- 2022-06-01 CN CN202280047926.9A patent/CN117616195A/en active Pending
- 2022-06-01 EP EP22731211.3A patent/EP4367381A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102021207001A1 (en) | 2023-01-05 |
| EP4367381A1 (en) | 2024-05-15 |
| JP2024522883A (en) | 2024-06-21 |
| KR20240026235A (en) | 2024-02-27 |
| WO2023280482A1 (en) | 2023-01-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |