WO2023006292A1 - Pompe à piston, en particulier pompe à carburant haute pression - Google Patents

Pompe à piston, en particulier pompe à carburant haute pression Download PDF

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Publication number
WO2023006292A1
WO2023006292A1 PCT/EP2022/065956 EP2022065956W WO2023006292A1 WO 2023006292 A1 WO2023006292 A1 WO 2023006292A1 EP 2022065956 W EP2022065956 W EP 2022065956W WO 2023006292 A1 WO2023006292 A1 WO 2023006292A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
piston
section
stop
pump piston
Prior art date
Application number
PCT/EP2022/065956
Other languages
German (de)
English (en)
Inventor
Patrick Hallas
Daniel HEINZINGER
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 WO2023006292A1 publication Critical patent/WO2023006292A1/fr

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
    • F02M59/44—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
    • F04B1/0421—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
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes

Definitions

  • Piston pump in particular high-pressure fuel pump
  • the invention relates to a piston pump, in particular 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 direct it to a fuel collection line ("rail"), from where the fuel is injected directly into the combustion chambers of the internal combustion engine.
  • a pump piston provided with a step is guided in the pump housing, and the pump piston is acted upon by a piston spring towards a drive, i.e. out of the pump housing.
  • a sleeve element which has a stop section for the pump piston, so that movement of the pump piston in Limited towards the drive and away from the housing and falling out of the pump piston is prevented from the pump housing.
  • DE 102015209539 A1 shows an example of such a high-pressure fuel pump.
  • the piston pump according to the invention has the advantage that a pump piston can be realized whose first section has a smaller diameter than before without the risk that the pump piston will be pushed out of the pump housing in a preassembled state (“delivery state”).
  • delivery state a preassembled state
  • the sleeve element assigned to the pump housing can thus remain unchanged compared to previous designs. This is achieved by the simple measure that the stop surface on the pump piston, which interacts with the sleeve element in the delivery state mentioned, is no longer (only) formed by the step between the first section and second section, but on a stop section additionally provided according to the invention.
  • Its diameter can be selected independently of the structural and in particular hydraulic requirements for the ratio of the diameters between the first section and the second section of the pump piston.
  • a desired so-called “stepped piston effect”, which is used to move medium, for example fuel, within the piston pump, can thus be designed as before and as desired. Also, no changes are necessary with regard to the manufacturing process of the pump piston, or such changes can be relatively small, since the additional stop section can be formed later. In particular, machining of the surface of the pump piston, for example by grinding, remains unaffected by the measure according to the invention. After all, only a few changes to the existing assembly process are required.
  • a piston pump in particular a high-pressure fuel pump.
  • a piston pump in particular a high-pressure fuel pump.
  • the piston pump according to the invention includes a pump housing, which can be designed, for example, as a substantially cylindrical part.
  • a receiving opening in the pump housing which can be designed, for example, as a stepped blind hole.
  • a pump piston is accommodated in this at least in certain areas.
  • a piston bushing for example, which guides the pump piston and is accommodated in the receiving opening, can serve for this purpose.
  • guide bushings that are axially spaced apart from one another and are pressed into the receiving opening are also conceivable.
  • a piston seal can also be arranged in the receiving opening in order to separate a high-pressure area from a low-pressure area.
  • the pump piston is designed as a stepped piston with a first section with a larger diameter and a second section with a smaller diameter. A step is thus formed between these two sections.
  • the first section with the larger diameter is that section of the pump piston that faces a pumping chamber
  • the second section with the smaller diameter is that section of the pump piston that faces a drive, for example a camshaft or an eccentric shaft of the internal combustion engine.
  • a sleeve element is assigned to the pump housing. This is arranged coaxially to the pump piston. It can be held, for example, on a carrier fastened to the pump housing, so that it is stationary in relation to the pump housing and is “associated with it”.
  • the sleeve element acts at least temporarily, for example in a so-called “delivery state” in which the piston pump is not yet installed in the internal combustion engine, but in which all components of the piston pump are preassembled, with the stop surface present on the pump piston.
  • the stop face is formed on a stop section in addition to the step between the first section and the second section, which at least in some areas has a larger outside diameter than the first section of the pump piston.
  • the stop surface and its dimension is thus independent of the diameters of the first section and the second section.
  • the contact surface can be designed as a classic step, as a radius transition or as a chamfer. In this way, the stop surface on the stop section of the pump piston can reliably come into contact with the corresponding stop section of the sleeve element.
  • the stop section is in one piece with the pump piston.
  • the stop section can be designed as a radially extending, circumferential annular collar that is formed by turning during the manufacture of the pump piston. Such a stop section is particularly stable.
  • the stop section is formed by a part that is separate from the pump piston.
  • a separate part can, for example, have the form of a ring or a sleeve.
  • the stop section which is designed as a separate part, is pressed onto the pump piston or is injection-molded onto it. This creates a reliable hold of the stop section on the pump piston.
  • the stop section designed as a separate part comprises a metal and/or a plastic material.
  • metal is its high strength and resistance to different media.
  • plastic is that it can be sprayed onto the pump piston, for example, at low cost.
  • the stop section has an annular surface facing away from the stop surface, which is orthogonal, oblique or convexly curved relative to a longitudinal axis of the pump piston when viewed from the outside.
  • An annular surface configured orthogonally to the longitudinal axis is particularly easy to produce.
  • a sloping or convexly curved annular surface has advantages in terms of flow technology.
  • the piston pump has, on the side of the stop surface facing away from the stop sleeve, a bushing which is assigned to the pump housing and is at least essentially coaxial with the pump piston, the minimum inside diameter of which is smaller than the outside diameter of the stop section, and the bushing on the side facing the stop section Side has an annular recess into which the stop portion can at least partially immerse during operation. In this way, any interference between the stopper portion and the bushing is avoided during the operation of the piston pump.
  • the shape of the recess is complementary to the shape of the ring surface. In this way it is particularly well avoided that the axial movement of the pump piston is impeded by the stop section.
  • the bushing can be a piston bushing or a clamping ring, for example.
  • stop section is arranged or forms the transition from the first section to the second section of the pump piston. This is the overall optimal position for the function of the piston pump.
  • Figure 1 is a schematic longitudinal section through an area of a
  • Piston pump with a pump housing, a pump piston, a sleeve member and a stop portion with a stop surface;
  • FIG. 2 shows an enlarged section II of FIG. 1
  • Figure 3 is a view similar to Figure 2 of an alternative embodiment
  • FIG. 4 shows a representation similar to FIG. 2 of a further alternative
  • FIG. 5 shows a representation similar to FIG. 2 of yet another alternative embodiment.
  • a piston pump bears the reference numeral 10 overall.
  • a high-pressure fuel pump of a fuel system of an internal combustion engine serves to compress the fuel to a high pressure and to convey it to a fuel rail, from where the fuel is injected directly into the combustion chambers of the internal combustion engine via injectors.
  • the piston pump 10 has an overall approximately cylindrical pump housing 12 in or on which the essential components of the piston pump 10 are arranged.
  • the piston pump 10 has a non-illustrated controlled inlet valve and an outlet valve.
  • the pump housing 12 In the pump housing 12 there is a receiving opening 14 which is designed as a stepped blind hole.
  • a cylindrical pump piston 16 is received in the receiving opening 14 .
  • the pump piston 16 has a first section 18 with a larger diameter and a second section 20 with a smaller diameter.
  • the pump piston 16 is therefore a stepped piston.
  • a pumping chamber (not shown), which is fluidically connected to the inlet valve and the outlet valve via channels.
  • a drive below the second section 20 there is a drive, not shown, which can cause the pump piston 16 to move back and forth parallel to a longitudinal axis 22 during operation.
  • the drive can be, for example, a camshaft or an eccentric shaft of the internal combustion engine.
  • the pump piston 16 is guided in the pump housing 12 and sealed off from it. This can be done, for example, via a piston bushing, or, as in the present case, via two guide rings and which are spaced apart axially one of these separate high-pressure seal.
  • the upper of the two guide rings and the high-pressure seal are not shown, but they are arranged between the pump piston 16 and the receiving opening 14 .
  • a bushing in the form of a clamping ring 24 is also arranged there, which is pressed into the receiving opening 14 and which serves in particular as a counter bearing for the high-pressure seal.
  • the lower of the two guide rings bears the reference number 26 and is arranged in the region of the second section 20 of the pump piston 16 .
  • the guide ring 26 is held by a seal carrier 28 which is welded to a flange 30 of the pump housing 12 .
  • the seal carrier 28 carries a low-pressure seal 32 and a sleeve element 34 directly above the lower guide ring 26. Since the sleeve element 34 is rigidly connected to the pump housing 12 via the seal carrier 28, it is “assigned” to the pump housing 12 in this respect.
  • the sleeve element 34 has, for example, a first radially outer and approximately cylindrical section 36 which is pressed into the seal carrier 28 .
  • a radial section 38 extends radially inwards towards an outer lateral surface 40 of the second section 20 of the pump piston 16. From a radially inner edge of the radial section 38 extends in FIG a second cylindrical section 42 at the top over a very short distance.
  • the sleeve element 34 can be produced, for example, as a shaped sheet metal part.
  • the pump piston 16 has a stop section 46 in the manner of an annular collar, which extends radially outwards and runs around in the circumferential direction.
  • the stop section 46 is designed in one piece with the pump piston 16.
  • an annular surface 50 of the stop section 46 facing away from the stop surface 48 is formed obliquely relative to the longitudinal axis 22 .
  • the clamping ring 24 has, on its axial end face pointing towards the sleeve element 34 and the stop section 46 , a radially inner annular recess 52 , the shape of which is complementary to the stop section 46 and the annular surface 50 .
  • FIG. 10 A so-called “delivery state” of the piston pump 10 is shown in FIG.
  • the piston pump 10 has not yet been installed in an internal combustion engine, but is in a preassembled state, for example in a warehouse, and is therefore ready for installation in the internal combustion engine.
  • the pump piston 16 is acted upon downwards in the figures by a piston spring (not shown), ie in a direction out of the pump housing 12 .
  • the stop surface 48 of the stop section 46 of the pump piston 16 comes into contact with the edge 44 of the sleeve element 34 facing it, as a result of which the pump piston 16 is prevented from falling out of the pump housing 12 .
  • the diameter of the edge 44 corresponds approximately to the mean diameter of the annular stop surface 48 . Since the outside diameter of the stop section 46 and thus also the stop surface 48 is larger than the outside diameter of the first section 18 of the pump piston 16, the stop surface 48 also comes into reliable and complete contact with the edge 44 when the pump piston 16 is not viewed in the radial direction is fully coaxial with sleeve member 34 and the diameter of first portion 18 is relatively small.
  • the piston pump 10 During operation of the piston pump 10, for example when it is installed in an internal combustion engine, a drive acts on the lower end of the pump piston 16 in the figures, as a result of which the pump piston 16 is pressed in the direction of the pumping chamber, i.e. upwards in the figures.
  • the stop surface 48 and the edge 44 are spaced apart from one another.
  • the above-mentioned recess 52 is provided, in which the stop section 46 can immerse when the pump piston 16 reaches its top dead center during operation, without the stop section 46 coming into contact with the clamping ring 24 .
  • the annular surface 50 is orthogonal relative to the longitudinal axis 22 and the recess 52 is correspondingly shaped in a complementary manner.
  • the annular surface 50 is convexly curved relative to the longitudinal axis 22 as viewed from the outside, and the recess 52 is correspondingly shaped in a complementary manner.
  • the stop section 46 is designed as a part that is separate from the pump piston 16 . In the present example, it is pressed onto the second section 20 of the pump piston 16 or molded onto it.
  • the stop portion 46 can be made of the same material as the pump piston 16, for example metal. But it can also be made of a plastic material.
  • the ring surface 50 is orthogonal to the longitudinal axis 22 . It is understood that with others not subscribed
  • the annular surface can be designed similarly to that shown in FIGS.

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

L'invention concerne une pompe à piston (10), en particulier une pompe à carburant haute pression, comprenant : - un carter de pompe (12) ; - un piston de pompe (16) dont au moins une partie est logée dans une ouverture de réception (14) dans le carter de pompe (12) et qui comporte une première portion (18) ayant un diamètre plus grand et une seconde portion (20) ayant un diamètre plus petit ; et - un élément de manchon (34), qui est associé au carter de pompe (12) et qui interagit, au moins à des moments, avec une surface d'arrêt (48) disposée sur le piston de pompe (16). Selon l'invention, la surface d'arrêt (48) est formée sur une portion d'arrêt (46) dont au moins une partie présente un diamètre extérieur supérieur à celui de la première portion (18) du piston de pompe (16).
PCT/EP2022/065956 2021-07-30 2022-06-13 Pompe à piston, en particulier pompe à carburant haute pression WO2023006292A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021208296.3 2021-07-30
DE102021208296.3A DE102021208296A1 (de) 2021-07-30 2021-07-30 Kolbenpumpe, insbesondere Kraftstoff-Hochdruckpumpe

Publications (1)

Publication Number Publication Date
WO2023006292A1 true WO2023006292A1 (fr) 2023-02-02

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ID=82156498

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/065956 WO2023006292A1 (fr) 2021-07-30 2022-06-13 Pompe à piston, en particulier pompe à carburant haute pression

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DE (1) DE102021208296A1 (fr)
WO (1) WO2023006292A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006069818A1 (fr) * 2004-12-28 2006-07-06 Robert Bosch Gmbh Pompe a piston, notamment pompe a carburant haute pression destinee a un moteur a combustion interne
EP2317120A1 (fr) * 2009-11-03 2011-05-04 Magneti Marelli S.p.A. Pompe à combustible dotée d'une usure réduite des joints pour un système à injection directe
EP2317119A1 (fr) * 2009-11-03 2011-05-04 Magneti Marelli S.p.A. Pompe à combustible dotée d'un dispositif d'amortissement pour un système à injection directe
DE102015209539A1 (de) 2015-05-22 2016-11-24 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
DE102019208445A1 (de) * 2019-06-11 2020-12-17 Robert Bosch Gmbh Kraftstoff-Hochdruckpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006069818A1 (fr) * 2004-12-28 2006-07-06 Robert Bosch Gmbh Pompe a piston, notamment pompe a carburant haute pression destinee a un moteur a combustion interne
EP2317120A1 (fr) * 2009-11-03 2011-05-04 Magneti Marelli S.p.A. Pompe à combustible dotée d'une usure réduite des joints pour un système à injection directe
EP2317119A1 (fr) * 2009-11-03 2011-05-04 Magneti Marelli S.p.A. Pompe à combustible dotée d'un dispositif d'amortissement pour un système à injection directe
DE102015209539A1 (de) 2015-05-22 2016-11-24 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
DE102019208445A1 (de) * 2019-06-11 2020-12-17 Robert Bosch Gmbh Kraftstoff-Hochdruckpumpe

Also Published As

Publication number Publication date
DE102021208296A1 (de) 2023-02-02

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