EP4081707A1 - Pompe à carburant haute pression - Google Patents

Pompe à carburant haute pression

Info

Publication number
EP4081707A1
EP4081707A1 EP20793647.7A EP20793647A EP4081707A1 EP 4081707 A1 EP4081707 A1 EP 4081707A1 EP 20793647 A EP20793647 A EP 20793647A EP 4081707 A1 EP4081707 A1 EP 4081707A1
Authority
EP
European Patent Office
Prior art keywords
section
pressure
low
delivery
fuel pump
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Withdrawn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
EP20793647.7A
Other languages
German (de)
English (en)
Inventor
Patrick Hallas
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 EP4081707A1 publication Critical patent/EP4081707A1/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Withdrawn legal-status Critical Current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
    • F02M59/44—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
    • 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
    • F04B1/053—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
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps

Definitions

  • a high-pressure fuel pump for an internal combustion engine is known from DE102004063075 A1, which comprises a housing and a piston which delimits a working space and has a shoulder pointing away from the working space. It is known that the piston is inserted into the housing with the end on the working space side first and a stop element is attached to the housing, which has a stop which at least temporarily cooperates with the shoulder.
  • a piston fuel pump for an internal combustion engine which comprises a pump cylinder and a pump piston which is slidably received in the pump cylinder.
  • the pump piston is guided radially by means of at least one first and at least one second guide section, and that the first and second guide sections are axially spaced apart, the first guide section being arranged in a pump cylinder of the piston fuel pump and the second guide section is arranged radially outside in the region of the end portion facing the drive.
  • the piston fuel pump has a bearing and sealing arrangement for the pump piston on the first guide section, which comprises a guide area for the radial guidance of the pump piston in the pump cylinder and a sealing area having a sealing lip.
  • a high-pressure fuel pump for an internal combustion engine which comprises a pump housing, a pump piston and at least one of the pump housing and the Pump piston limited delivery space. It is provided that a seal for sealing the delivery chamber and a separate guide element for guiding the pump piston are arranged between the pump piston and the pump housing, the seal being designed as a plastic ring with an essentially sleeve-shaped base section.
  • the invention is based on the desire to create a powerful and durable high-pressure fuel pump that can be manufactured and installed simply and safely and thus economically. This is implemented by the high pressure fuel pump according to claim 1.
  • the high-pressure fuel pump can be a pump for compressing a fuel to a high pressure, for example 350 bar or 500 bar or above.
  • a fuel such as gasoline.
  • it can be a piston pump that can be driven, for example, via a camshaft of an internal combustion engine.
  • the delivery piston is designed according to the invention as a stepped piston, with a section facing the delivery space with a larger diameter and with a section facing away from the delivery space with a smaller diameter and with an annular shoulder arranged between these sections in the low-pressure space, changes with the stroke movement of the Delivery piston not only the volume of the delivery space but also - in an anticorrelated manner - the volume of the low-pressure space, which makes it easier to fill the delivery space from the low-pressure space.
  • the delivery piston can be secured against falling out of the housing, which is particularly important when the high-pressure fuel pump is installed in a Internal combustion engine is advantageous as long as the delivery piston is not yet secured against falling out of the housing by resting on a cam of a camshaft.
  • the inventive guide for fixing the delivery piston in the radial direction minimizes or optimizes the radial play of the delivery piston on the one hand and thus minimizes wear on the delivery piston and the components that interact with it.
  • the guide which is separate from the low-pressure seal and from the high-pressure seal, relieves the high-pressure seal and the low-pressure seal from forces acting radially on them and from the associated wear phenomena.
  • new design options arise with regard to these seals, which can be expressed, for example, in the fact that the seals do not need to provide lateral guidance, i.e. can be moved laterally in the housing, which in turn can optimize the actual sealing function.
  • the guide and the stop sleeve are implemented together by a single hybrid component which has a metal section and a plastic section connected to the metal section with a material fit and / or a form fit, the delivery piston with its annular shoulder on the metal section to secure against falling out of the housing of the hybrid component is able to come into contact in the axial direction and the delivery piston is fixed radially by being in contact with the plastic section of the hybrid component in the radial direction, there are a number of advantages.
  • the hybrid component can be made and assembled more compactly than it is possible with two separate components, so that the entire pump can be made more compact or so that new design leeway arises.
  • the hybrid component in addition to a Through bore in which the delivery piston is displaceable has one or more further passages, for example bores. This enables a pressure equalization between a part of the low-pressure chamber, which is on the side of the stop sleeve facing the delivery chamber, and a part of the low-pressure chamber, which is on the side of the stop sleeve facing away from the delivery chamber, even if the guide is in close contact with the delivery piston.
  • the integrity of the hybrid component is in principle already secured by the material connection between the metal section and the plastic section. It can also be secured by a form fit between the metal section and the plastic section.
  • the metal section and the plastic section can engage in one another in such a way that they are prevented from becoming detached from one another even in the event of a failure of the material connection.
  • a part made of metal section and plastic section can have an undercut pointing in the radial and / or axial direction, into which the other part made of metal section and plastic section engages in a form-fitting manner.
  • a further development provides that the plastic section is arranged radially between the delivery piston and the metal section, so that the delivery piston is spaced apart from the metal section. This prevents direct contact between the metal section and the piston and the potentially excessive wear that this entails.
  • a further development provides that the plastic section is set back from the end section of the hybrid component pointing towards the ring shoulder, so that only the metal section of the hybrid component, but not the plastic section of the hybrid component, can come into contact with the ring shoulder in the axial direction. Flow and relaxation effects, as they can occur when plastic parts are subjected to mechanical stress, are thus avoided. It is sufficient if the setback can be reliably implemented, for example by a nominal dimension of at least 0.2 mm.
  • the plastic section has a circumferential bevel on its end section pointing towards the annular shoulder. In this case, it is easier to introduce the delivery piston into the hybrid component.
  • a further development provides that the hybrid component in the axial direction between the high pressure seal and the low pressure seal is arranged.
  • This has the advantage that when the delivery piston is passed through the low-pressure seal carrier, then through the hybrid component and subsequently through the low-pressure seal, when the high-pressure fuel pump is manufactured or a piston assembly of the high-pressure fuel pump is preassembled ensures that the delivery piston is already safely guided and centered radially when it penetrates the low-pressure seal. In this way, the assembly of the delivery piston can be facilitated and damage to the low-pressure seal, for example damage to the sealing lips of the low-pressure seal, can be reliably excluded in the assembly process.
  • the plastic section can for example consist of PFA, PEEK or other thermoplastically processable plastics.
  • the plastic section or the hybrid component can be realized by molding on or by injection molding a liquefied plastic material onto the metal section.
  • An advantageous method for producing a high-pressure fuel pump according to the invention further provides that the hybrid component is first produced by the metal section being connected to the plastic section in a materially and / or form-fitting manner or by the plastic section being produced on the metal section so that the metal section is connected to the plastic section is subsequently cohesively connected that subsequently an assembly is preassembled by arranging the hybrid component and the low-pressure seal in the low-pressure seal carrier, and then connecting the assembly to the housing, the low-pressure seal carrier being connected to the housing in a fluid-tight manner.
  • FIG. 1 shows a simplified schematic representation of a fuel system for an internal combustion engine
  • FIG. 2 shows a longitudinal section through a high-pressure fuel pump of the fuel system of FIG. 1;
  • FIG. 3 shows a detail from FIG. 2 in an enlarged illustration
  • FIG. 4 shows a detailed view of a first hybrid component
  • FIG. 5 shows a detailed view of a second hybrid component
  • FIG. 6 shows a detailed view of a third hybrid component.
  • FIG. 1 shows a fuel system 10 for an internal combustion engine, not shown further, in a simplified schematic illustration.
  • fuel is supplied to a delivery chamber 26 of a high-pressure fuel pump 28 via a suction line 14, by means of a prefeed pump 16, via a low-pressure line 18, via an inlet 20 of a quantity control valve 24 that can be actuated by an electromagnetic actuator 22.
  • the quantity control valve 24 can be a positively openable inlet valve of the high-pressure fuel pump 28.
  • the high-pressure fuel pump 28 is designed as a piston pump, with a delivery piston 30 being able to be moved vertically in the drawing by means of a cam disk 32 (“drive”).
  • An outlet valve 40 shown in FIG. 1 as a spring-loaded check valve, which can open towards the outlet 36, is arranged hydraulically between the delivery chamber 26 and an outlet 36 of the high-pressure fuel pump 28.
  • the outlet 36 is connected to a high pressure line 44 and via this to a high pressure accumulator 46 (“common rail”).
  • a pressure-limiting valve 42 likewise drawn as a spring-loaded check valve, is arranged hydraulically between the outlet 36 and the conveying chamber 26 and can open towards the conveying chamber 26.
  • the prefeed pump 16 conveys fuel from the fuel tank 12 into the low-pressure line 18.
  • the quantity control valve 24 can be closed and opened as a function of a particular demand for fuel. This influences the amount of fuel delivered to the high-pressure accumulator 46.
  • the electromagnetic actuating device 22 is activated by a control and / or regulating device 48.
  • FIG. 2 shows the high-pressure fuel pump 28 from FIG. 1 in an axial sectional illustration.
  • the high-pressure fuel pump 28 comprises a housing 50 which can be screwed to an engine block 53 of the internal combustion engine by means of a flange 52.
  • the housing 50 also has a plurality of hydraulic channels 54, 55, 56 and 58.
  • the high-pressure fuel pump 28 comprises a cover 60 and a pressure damper 62.
  • the high-pressure fuel pump 28 is at least partially rotationally symmetrical to a longitudinal axis 64 pointing in the axial direction.
  • the axial direction also coincides with the direction in which the delivery piston 30 can be displaced in the housing 50.
  • the low-pressure chamber 81 includes, inter alia, the damper chamber 81a, which is arranged under the cover 60 and accommodates the pressure damper 62, and a compensation chamber 81b fluidly connected to the damper chamber 81a via a hydraulic channel (not shown), which is located below the in FIG Housing 50 and above the low pressure seal carrier 68 is located.
  • the high-pressure fuel pump 28 has the outlet 36 for connection to the high-pressure line 44.
  • the outlet valve 40 (in a section on the left in the drawing) and the pressure limiting valve 42 (in a central section) are arranged in the housing 50, hydraulically connected to the outlet 36.
  • the quantity control valve 24 is arranged in a section of the housing 50 in the middle on the right in the drawing.
  • the high-pressure fuel pump 28 also comprises: the delivery chamber 26, the delivery piston 30 and a liner 66.
  • the delivery piston 30, which is displaceable along the longitudinal axis 64, is designed as a so-called “stepped piston” and essentially has two sections.
  • FIG. 2 A lower area of FIG. 2 is characterized by a frame III and is shown enlarged in FIG.
  • FIG. 3 shows an approximately cup-shaped low-pressure seal carrier 68, as well as a piston spring 70 arranged radially on the outside around a section of the low-pressure seal carrier 68 and designed as a helical spring, which is supported with an end section on the low-pressure seal carrier 68, which is why this is also referred to as a "spring receptacle" becomes.
  • a spring plate 72 on which an end portion of the piston spring 70 is received, is pressed onto an end section of the delivery piston 30 which is lower in the drawing and which faces the drive.
  • a piston seal referred to as low-pressure seal 74, is arranged radially inside the low-pressure seal carrier 68, which radially surrounds the lower second section 30 ′′ (which faces the drive) of the delivery piston 30 and seals the compensation chamber 81b from the outside towards the engine block 53.
  • the delivery piston 30 is displaceable along the longitudinal axis 64 relative to the low-pressure seal 74.
  • the low-pressure seal 74 has an overall ring-shaped structure.
  • the low-pressure seal carrier 68 adjacent to the low-pressure seal 74, there is one arranged within the low-pressure seal carrier 68 and likewise approximately hat-shaped trained stop sleeve 76 is provided. Their function is to implement a stop for the annular shoulder 31 of the delivery piston 30 and thus always secure the delivery piston 30 against falling out of the housing 50.
  • the low-pressure seal 74 is arranged radially on the outside of the delivery piston 30 along the longitudinal axis 64.
  • the low-pressure seal 74 is designed to be essentially rotationally symmetrical, with upper and lower sections of the low-pressure seal 74 being designed to be axially mirror-symmetrical to one another in the drawing.
  • the stop sleeve 76 is implemented in the context of a hybrid component 90, more precisely than its metal section 90a.
  • the hybrid component 90 further comprises a plastic section 90b, which is connected to the metal section 90a at least in a materially and / or form-fitting manner and is provided radially inside the metal section 90a.
  • the plastic section 90b rests radially with at most little play on the delivery piston 30, so that it fixes it radially, that is to say guides it.
  • the procedure is that the hybrid component 90 has, in addition to a through hole 90c in which the delivery piston 30 is displaceable, one or more further passages 90d in order to equalize pressure between a part of the low-pressure chamber 81, which is located on the delivery chamber 26 facing the side of the stop sleeve 76, and a part of the low-pressure chamber 81, which is located on the side of the stop sleeve 76 facing away from the delivery chamber 26, to enable.
  • the passages 90d can, for example, be bores or cutouts that are made in the metal section 90a of the hybrid component 90 and have a cross section that is in each case and or in total smaller than the cross section of the through bore 90c in which the delivery piston 30 can be displaced is.
  • the metal portion 90a and the plastic portion 90b in addition to the Are connected to one another by a form fit 92.
  • this is an undercut recess in the metal section 90a, into which the plastic section 90b engages.
  • the metal section 90a into which the plastic section 90b engages.
  • Plastic section 90b is set back by at least 0.2 mm from the end section of the hybrid part 90 pointing towards the ring shoulder 31, so that only the metal section 90a of the hybrid component 90, but not the plastic section 90b of the hybrid component 90, come into contact with the ring shoulder 31 in the axial direction able. It is also provided that the
  • Plastic section 90b has a circumferential bevel 94 on its end section pointing towards annular shoulder 31, so that introduction of delivery piston 30 into hybrid component 90 is facilitated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)

Abstract

L'invention concerne une pompe à carburant haute pression pourvue d'un boîtier, pourvue d'une chambre de transport qui est disposée dans le boîtier, et pourvue d'un piston de transport qui est disposé dans le boîtier de telle sorte qu'il peut être déplacé dans une direction axiale, lequel piston de transport délimite la chambre de transport. Selon l'invention, un guide du piston de transport dans la direction radiale et un manchon d'arrêt qui empêche le piston de transport de chuter hors du boîtier sont réalisés conjointement au moyen d'un unique composant hybride qui présente une section métallique et une section en plastique qui est reliée par liaison de matière à la section métallique, le piston de transport pouvant prendre appui dans la direction axiale au moyen de l'épaulement annulaire de ce dernier contre la section métallique du composant hybride afin d'être protégé contre la chute hors du boîtier, et le piston de transport étant fixé radialement par appui dans la direction radiale contre la section en plastique du composant hybride.
EP20793647.7A 2019-12-23 2020-10-19 Pompe à carburant haute pression Withdrawn EP4081707A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102019220525 2019-12-23
DE102020200596.6A DE102020200596A1 (de) 2019-12-23 2020-01-20 Kraftstoff-Hochdruckpumpe
PCT/EP2020/079325 WO2021129966A1 (fr) 2019-12-23 2020-10-19 Pompe à carburant haute pression

Publications (1)

Publication Number Publication Date
EP4081707A1 true EP4081707A1 (fr) 2022-11-02

Family

ID=76205669

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20793647.7A Withdrawn EP4081707A1 (fr) 2019-12-23 2020-10-19 Pompe à carburant haute pression

Country Status (6)

Country Link
EP (1) EP4081707A1 (fr)
JP (1) JP2023508380A (fr)
KR (1) KR20220113530A (fr)
CN (1) CN114901940A (fr)
DE (1) DE102020200596A1 (fr)
WO (1) WO2021129966A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004063075B4 (de) 2004-12-28 2015-11-26 Robert Bosch Gmbh Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine mit einem Stufenkolben und einem Mengensteuerventil
JP5352646B2 (ja) * 2011-01-27 2013-11-27 株式会社日本自動車部品総合研究所 高圧ポンプ
CN104870802B (zh) 2012-12-20 2018-11-02 罗伯特·博世有限公司 用于内燃机的活塞燃料泵
DE102017212498A1 (de) 2017-07-20 2019-01-24 Robert Bosch Gmbh Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe für eine Brennkraftmaschine

Also Published As

Publication number Publication date
JP2023508380A (ja) 2023-03-02
DE102020200596A1 (de) 2021-06-24
WO2021129966A1 (fr) 2021-07-01
CN114901940A (zh) 2022-08-12
KR20220113530A (ko) 2022-08-12

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