EP4127447A1 - Pompe à carburant haute pression - Google Patents

Pompe à carburant haute pression

Info

Publication number
EP4127447A1
EP4127447A1 EP21702980.0A EP21702980A EP4127447A1 EP 4127447 A1 EP4127447 A1 EP 4127447A1 EP 21702980 A EP21702980 A EP 21702980A EP 4127447 A1 EP4127447 A1 EP 4127447A1
Authority
EP
European Patent Office
Prior art keywords
guide
pressure
fuel pump
pump
pressure fuel
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.)
Withdrawn
Application number
EP21702980.0A
Other languages
German (de)
English (en)
Inventor
Matthias RIEDLE
Stephan Wehr
Daniel HEINZINGER
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP4127447A1 publication Critical patent/EP4127447A1/fr
Withdrawn legal-status Critical Current

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
    • F02M59/02—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
    • F02M59/025—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 a single piston
    • F02M59/027—Unit-pumps, i.e. single piston and cylinder pump-units, e.g. for cooperating with a camshaft
    • 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
    • F02M59/48—Assembling; Disassembling; Replacing
    • 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
    • F04B1/0439—Supporting or guiding means for the 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
    • F04B1/0448—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
    • 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
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • 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
    • F04B53/02—Packing the free space between cylinders and 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
    • 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
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes
    • 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
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners
    • 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
    • F04B53/162—Adaptations of cylinders
    • F04B53/166—Cylinder liners
    • F04B53/168—Mounting of cylinder liners in cylinders

Definitions

  • the invention relates to a high-pressure fuel pump according to the preamble of claim 1.
  • High-pressure fuel pumps for fuel systems of internal combustion engines are known from the market. These high-pressure fuel pumps compress the fuel to a high pressure and pass it on to a fuel collecting line (“rail”), from where the fuel is injected directly into the combustion chambers of the internal combustion engine.
  • a pump piston is guided in the pump housing, and a piston spring acts on the pump piston towards a drive.
  • DE 102013226088 A1 it is known to mount and guide the pump piston at two axially spaced apart points opposite the pump housing, for example by means of an annular guide element. It is also known from DE 102013226088 A1 to arrange a high-pressure seal between the pump piston and the housing, which seals a high-pressure area from a low-pressure area.
  • a guide ring previously arranged on a separate seal carrier can be dispensed with.
  • the axial distance becomes Reduced between the two guide sections, whereby the pump piston can be better inserted during assembly.
  • the risk of damage to a low-pressure seal during assembly of the pump piston is also reduced, since the pump piston is fed to the seal carrier and thus to the low-pressure seal during assembly with a lower axial offset and less misalignment, thus avoiding a decentralized impact of the pump piston.
  • a coaxial offset of the pump piston is also reduced, so that the pump piston can tilt less both during assembly and during operation. This reduces the transverse forces that act on the pump piston, which ultimately leads to reduced wear on the pump piston.
  • the transverse forces are not introduced via the seal carrier of the low-pressure seal, but directly into the pump housing, which improves strength.
  • the second guide section also serves as a clamping ring to secure the high-pressure seal in its axial position.
  • a high-pressure fuel pump with a pump housing and a pump piston.
  • the pump housing can, for example, be polygonal or rotationally symmetrical and is usually made of metal.
  • the pump piston is usually a stepped piston which, with a section that has a larger diameter, delimits a delivery space, whereas a section that has a smaller diameter is acted upon by a piston spring against a drive.
  • the drive can for example comprise an eccentric section or a cam section.
  • the high-pressure fuel pump is often a so-called “plug-in pump” that is inserted into an opening in a cylinder head of an engine block and driven by a camshaft of the internal combustion engine.
  • the pump piston is received in a receiving opening in the pump housing.
  • This receiving opening is usually stepped and like a blind hole, and it is usually produced by a machining process, for example drilling.
  • a longitudinal axis of the receiving opening can be coaxial with a longitudinal axis of the pump housing.
  • the high-pressure fuel pump also includes a high-pressure seal which surrounds the pump piston in a sealing manner and rests against it and which seals a high-pressure area from a low-pressure area.
  • This high-pressure seal can also be ring-shaped and have one or more sealing lips.
  • the high-pressure fuel pump furthermore comprises a guide device for the pump piston which comprises at least two guide sections which are axially spaced apart from one another, as seen in the longitudinal direction of the pump piston, and which guide the pump piston
  • these two guide sections are arranged within the receiving opening of the pump housing, on both sides of the high-pressure seal.
  • a first guide section is therefore arranged on a side of the high pressure seal facing a delivery chamber, seen in an axial direction, and a second guide section, viewed in the axial direction, on a side of the high pressure seal facing away from the delivery chamber.
  • the axial spacing of the two guide sections creates an overall axial length of the guide device which corresponds approximately to the axial guide length of a piston bushing known from the prior art and which reliably prevents undesired tilting of the piston.
  • At least one of the guide sections and the high-pressure seal are present on a preassembled arrangement (“cartridge”) which is arranged in the receiving opening of the pump housing, preferably pressed into the receiving opening.
  • a preassembled arrangement has the advantage that, when assembling the high-pressure fuel pump, the risk of a component being forgotten is reduced, since the components are made available already preassembled for final assembly. The risk that a component is not installed in the correct position is also reduced, and an additional query for quality assurance with regard to the correct installation during final assembly can be dispensed with.
  • Such a preassembled arrangement can have the same external dimensions as a piston bushing in high-pressure fuel pumps from the prior art, so that the pump housing thereof can continue to be used, that is, existing manufacturing plants and processes can still be used.
  • the axial length of the guide sections can be adjusted accordingly.
  • the pre-assembled assembly can be installed at a single assembly station during the final assembly of the high-pressure fuel pump. It is also possible to obtain the pre-assembled arrangement as a whole from a sub-supplier, which can reduce costs. This preassembled assembly can also be tested in advance, that is, before final assembly, measured in terms of its function. If later mating with the pump piston is required, the pre-assembled assembly can be classified according to the inside diameter.
  • the preassembled arrangement comprises a sleeve in or on which at least one of the guide sections and the high-pressure seal are arranged. This can be implemented in a particularly simple and cost-effective manner, and such a sleeve can very easily be pressed into the receiving opening.
  • At least one of the guide sections is formed in one piece with the sleeve and the high-pressure seal is received in the sleeve.
  • the sleeve thus has, in sections, the function of a bushing which receives the corresponding counterpart, in the present case the pump piston, with an accurate fit. Due to the one-piece design, the number of parts to be handled is further reduced.
  • At least one of the guide sections is pressed into the sleeve. This is technically easy to implement and allows the high-pressure seal to be securely held between the two guide sections. This applies in particular when the other guide section is formed in one piece with the sleeve.
  • the two guide sections are designed identically as so-called “identical parts”. This considerably simplifies assembly, and this also has considerable logistical advantages. Using the same parts results in the decisive advantage that the "piston guide” and “clamping of the high-pressure seal” functions can be implemented directly in the housing. A previously necessary guide ring in the seal carrier of the low-pressure seal can thus be omitted.
  • At least one of the guide sections is designed symmetrically relative to a center plane arranged orthogonally to the axial direction.
  • a guide section can be designed as a ring that cannot be changed in the longitudinal direction or as a tube that cannot be changed in the longitudinal direction. This again considerably simplifies the assembly, since it is not necessary to ensure correct orientation or alignment of the guide section during installation.
  • the high-pressure fuel pump in particular the preassembled arrangement, has a first fluid connection which fluidly connects a first area adjacent to a first end face of the first guide section with a second area adjacent to a second end face of the first guide section.
  • the fluid connection ensures that a high fluid pressure prevailing in the high pressure area is applied largely unthrottled over the first guide section up to the high pressure seal, even if a guide gap between the pump piston and the first guide section is only comparatively small (“tight guide play”) ).
  • the high-pressure fuel pump in particular the preassembled arrangement, has a second fluid connection which fluidically connects a first area adjacent to a first end face of the second guide section with a second area adjacent to a second end face of the second guide section. That lies based on the consideration that there are operating situations in which fluid passes through the high pressure seal. This is the case in particular at a relatively low pressure level in the high pressure area. In such a situation, the fluid that has flowed over the high-pressure seal can flow off over the second guide section into a low-pressure region.
  • first fluid connection and / or the second fluid connection have at least one fluid channel extending overall in the axial direction through the respective guide section and / or a groove extending overall in the axial direction in a radially inner circumferential surface of the respective guide section and / or, if the guide sections are arranged in a sleeve, comprise a flattening or a groove on a radially outer lateral surface of the sleeve.
  • the fluid channel and / or the groove is arranged obliquely relative to a longitudinal axis of the first or second guide section. In this way, the guiding functions of the guiding sections are influenced as little as possible by the fluid connection.
  • FIG. 1 shows a longitudinal section through a high-pressure fuel pump with a first embodiment of a preassembled arrangement with a sleeve, two guide sections and a high-pressure seal arranged between them;
  • FIG. 2 shows a longitudinal section through an enlarged area of the high-pressure fuel pump from FIG. 1, showing the preassembled arrangement
  • FIG. 3 shows a perspective sectioned illustration of the preassembled arrangement from FIG. 1;
  • FIG. 4 shows a representation similar to FIG. 2 of a second embodiment of a preassembled arrangement
  • FIG. 5 shows a representation similar to FIG. 3 of the second embodiment from FIG.
  • a high-pressure fuel pump for a fuel system of an internal combustion engine bears the overall reference number 10. It comprises a pump housing 12, which in the present case has an approximately cylindrical shape with a longitudinal axis 14 step-shaped blind hole-like and for example produced by a bore receiving opening 16 is present, in which a pump piston 18 is received in a manner to be shown.
  • the pump piston 18 is designed as an elongated cylindrical part with a first section 20 and a second section 22 seen in the axial direction.
  • the first section 20 has a larger diameter than the second section 22.
  • the first section 20 faces a delivery chamber 24, whereas the second section 22 faces a drive, not shown.
  • the high-pressure fuel pump 10 also includes an inlet valve 26, which is designed as a check valve, but which can be forcibly held in an open position by an electromagnetic actuating device 28.
  • the high-pressure fuel pump 10 also includes an outlet valve 30 designed as a check valve and a pressure limiting valve 32.
  • the high-pressure fuel pump 10 is part of a fuel system (not shown further) of an internal combustion engine.
  • the fuel for example gasoline or diesel, arrives at the inlet valve 26 from a mostly electrically driven prefeed pump.
  • the pump piston 18 is set in a reciprocating motion at its lower end in FIG the outlet valve 30 is expelled to a fuel collection line (“rail”). From there, the fuel reaches the assigned combustion chambers via injectors.
  • the pump piston 18 is guided relative to the pump housing 12 in the receiving opening 16 by a guide device 36, which comprises two axially spaced apart annular guide sections 38 and 40 (seen in the direction of the longitudinal axis 14 of the pump housing 12 and the pump piston 18). Between the two guide sections 38 and 40, there is a high-pressure seal 42, which is also ring-shaped as a whole.
  • the high pressure seal 42 can be made of a PTFE material, for example.
  • the pump piston 18 is guided by the two sections 38 and 40 at two axially spaced points, namely on the one hand just below the delivery chamber 24 through the first annular guide section 38. This is seen in the direction of the longitudinal axis 14 on a side facing the delivery chamber 24 the high pressure seal 42 is arranged. On the other hand, the pump piston 18 is guided through the second annular guide section 40 just above the lower beginning of the receiving opening 16 in FIG. This guide section is arranged, viewed in the direction of the longitudinal axis 14, on the side of the high-pressure seal 42 facing away from the delivery chamber 24.
  • An annular spring 44 which is also referred to as a “wave spring”, is tensioned between the high-pressure seal 42 and the first guide section 38.
  • This can be, for example, a plate spring or a helical spring.
  • the high pressure seal 42 is opened by the spring 44 urged against the second guide section 40, which in this respect forms a holding section for the high-pressure seal 42.
  • the guide device 36 with the two guide sections 38 and 40 and the high-pressure seal 42 with the spring 44 are part of a preassembled arrangement 46.
  • the first guide section 38 is embodied in the present case, for example, in one piece with the sleeve 48.
  • the spring 44 and the high-pressure seal 42 are first inserted into the sleeve 48 from the end of the sleeve 48 facing away from the first guide section 38, and then the second guide section 40, which is initially a separate annular part, is pressed into the sleeve 48.
  • the sleeve 48 with the one-piece first guide section 38 and the second guide section 40 can be made of a metal, for example stainless steel.
  • the preassembled arrangement 46 has a first fluid connection 50 in the area of the first guide section 38.
  • this includes, for example, four fluid channels arranged evenly distributed in the circumferential direction of the first guide section 38, which extend in the axial direction from depressions 51 in a first annular end face 52 of the first guide section 38 to a second annular end face 54 of the first guide section 38.
  • the fluid connections or fluid channels 50 can be produced, for example, by through bores.
  • the sleeve 48 rests with the first end face 52 on a shoulder (without reference number) of the step-shaped receiving opening 16.
  • a first region adjacent to the first end face 52 is fluidically connected to a second region adjacent to the second end face 54.
  • the fluid connection can alternatively or additionally comprise at least one groove extending overall in the axial direction (longitudinal axis 14) in a radially inner lateral surface 56 of the first guide section 38.
  • This groove can be parallel to the longitudinal axis 14 run, or it can run obliquely to the longitudinal axis 14 and thus helically.
  • the fluid connection can alternatively or additionally comprise at least one flattening or a groove on a radially outer lateral surface 58 of the sleeve 48.
  • a through opening starting from the flattening or the groove and extending overall in the radial direction would be through the wall of the sleeve 48 at an axial height approximately at the high pressure seal 42 necessary.
  • the preassembled arrangement 46 also has a second fluid connection 60, which in the present case is formed, for example, by four grooves which are arranged uniformly distributed in the circumferential direction of the second guide section 40 and are formed in a radially inner lateral surface 62 of the second guide section 40.
  • the grooves 60 extend, for example, parallel to the longitudinal axis 14. In an embodiment not shown, they could also run obliquely to the longitudinal axis 14 and thus helically.
  • a first area adjacent to a first end face 64 of the second guide section 40 is fluidically connected to a second area adjacent to a second end face 66.
  • a seal carrier 68 which carries a low-pressure seal 70, also belongs to the high-pressure fuel pump 10. This is also ring-shaped and lies against the second section 22 of the pump piston 18 in a sealing manner. While the area arranged in FIGS. 1 and 2 above the high-pressure seal 42 between the pump housing 12 and the pump piston 18 and fluidically connected to the delivery space 24 forms a high-pressure area 72 in which at least temporarily and at least approximately the pressure prevailing in the delivery space 24 during a delivery stroke If the fluid pressure is high, the area arranged in FIGS. 1 and 2 below the high pressure seal 42 between the pump housing 12, the pump piston 18, the seal carrier 68 and the low pressure seal 70 forms a low pressure area 74.
  • the high-pressure seal 42 For an optimal sealing effect of the high-pressure seal 42, it is necessary that the high fluid pressure prevailing in the high-pressure region 72 (gasoline or diesel, for example, can be used as the fluid) is as unthrottled as possible up to High pressure seal 42 is applied.
  • the high-pressure seal 42 typically has one or more sealing lips, on whose area facing away from the high-pressure area 72 the comparatively low fluid pressure of the low-pressure area 74 is applied. The sealing lips are therefore acted upon against the movable pump piston 18 and against the second guide section 40 by the high fluid pressure prevailing in the high pressure area 72 in order to achieve an optimal sealing effect.
  • the first fluid connection 50 through the first guide section 38 ensures that the high fluid pressure is applied largely unthrottled across the first guide section 38 up to the high-pressure seal 42, even if there is a guide gap between the Pump piston 18 and the first guide section 38 is only comparatively small.
  • the depressions 51 ensure that the pressure prevailing in the high-pressure region 72 can be transmitted through the fluid channels 50, although the sleeve 48 with the first end face 52 rests against the shoulder (without reference number) of the receiving opening 16.
  • FIGS. 4 and 5 An alternative embodiment of a preassembled arrangement 46, which can also be referred to as a “cartridge solution”, will now be explained with reference to FIGS. 4 and 5.
  • the first guide section 38 is also designed as a part (initially) separate from the sleeve 48, namely as a guide ring which is pressed into the sleeve 48.
  • the two guide sections 38 and 40 are designed to be absolutely identical to one another, that is to say represent so-called “identical parts”.
  • the two guide sections 38 and 40 are essentially identical to the guide section 40 of FIG Embodiment of Figures 1-3 executed, so as a cylindrical ring, which, viewed in the axial direction (longitudinal axis 14) is symmetrical relative to a center plane that is orthogonal to the longitudinal axis 14, that is, does not change in its longitudinal direction.
  • the first fluid connection 50 is designed as a plurality of grooves evenly distributed in the circumferential direction and running in the longitudinal direction of the guide sections 38 and 40 on the radially inner lateral surface 56 or 62 of the two guide sections 38 and 40. While the grooves 50 in the first guide portion 38 for the

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

Pompe à carburant haute pression (10) comprenant un carter de pompe (12), un piston de pompe (18) logé dans une ouverture de réception (16) du carter de pompe (12), un joint haute pression (42) qui entoure le piston de pompe (18) de manière étanche et qui ferme une région haute pression (72) à partir d'une région basse pression (74), et un dispositif de guidage (36) qui comprend au moins deux parties de guidage (38, 40) qui sont espacées axialement l'une de l'autre et guident le piston de pompe (18) avec un ajustement coulissant. Le présent document propose d'agencer les au moins deux parties de guidage (38, 40) dans l'ouverture de réception (16) du carter de pompe (12), une première partie de guidage (38) étant disposée, lorsqu'elle est vue dans une direction axiale (14), sur un côté du joint haute pression (42) faisant face à l'espace de distribution (24), et une seconde partie de guidage (40) étant agencée, lorsqu'elle est vue dans la direction axiale (14), sur un côté du joint haute pression (42) opposé à l'espace de distribution (24).
EP21702980.0A 2020-04-03 2021-02-01 Pompe à carburant haute pression Withdrawn EP4127447A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102020204348 2020-04-03
DE102020214037.5A DE102020214037A1 (de) 2020-04-03 2020-11-09 Kraftstoff-Hochdruckpumpe
PCT/EP2021/052247 WO2021197684A1 (fr) 2020-04-03 2021-02-01 Pompe à carburant haute pression

Publications (1)

Publication Number Publication Date
EP4127447A1 true EP4127447A1 (fr) 2023-02-08

Family

ID=77749763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21702980.0A Withdrawn EP4127447A1 (fr) 2020-04-03 2021-02-01 Pompe à carburant haute pression

Country Status (6)

Country Link
US (1) US20230228237A1 (fr)
EP (1) EP4127447A1 (fr)
KR (1) KR20220156955A (fr)
CN (1) CN115398089A (fr)
DE (1) DE102020214037A1 (fr)
WO (1) WO2021197684A1 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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DE102014214282A1 (de) * 2014-07-22 2016-01-28 Robert Bosch Gmbh Kraftstoffhochdruckpumpe, insbesondere Steckpumpe
DE102015202632A1 (de) * 2015-02-13 2016-08-18 Robert Bosch Gmbh Hochdruckpumpe für ein Kraftstoffeinspritzsystem
DE102016225922A1 (de) * 2016-12-21 2018-06-21 Robert Bosch Gmbh Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine
DE102017212501A1 (de) * 2017-07-20 2019-01-24 Robert Bosch Gmbh Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine
DE102017212490A1 (de) * 2017-07-20 2019-01-24 Robert Bosch Gmbh Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine
DE102017212484A1 (de) * 2017-07-20 2019-01-24 Robert Bosch Gmbh Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine
DE102017212498A1 (de) * 2017-07-20 2019-01-24 Robert Bosch Gmbh Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine
DE102018200146B4 (de) * 2018-01-08 2019-11-28 Continental Automotive Gmbh Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem

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DE102020214037A1 (de) 2021-10-07
CN115398089A (zh) 2022-11-25
WO2021197684A1 (fr) 2021-10-07

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