WO2016142072A1 - Pompe à haute pression de carburant, notamment pour un dispositif d'injection de carburant d'un moteur à combustion interne - Google Patents

Pompe à haute pression de carburant, notamment pour un dispositif d'injection de carburant d'un moteur à combustion interne Download PDF

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Publication number
WO2016142072A1
WO2016142072A1 PCT/EP2016/050010 EP2016050010W WO2016142072A1 WO 2016142072 A1 WO2016142072 A1 WO 2016142072A1 EP 2016050010 W EP2016050010 W EP 2016050010W WO 2016142072 A1 WO2016142072 A1 WO 2016142072A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
pump piston
housing part
piston
receptacle
Prior art date
Application number
PCT/EP2016/050010
Other languages
German (de)
English (en)
Inventor
Markus Schetter
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 WO2016142072A1 publication Critical patent/WO2016142072A1/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
    • 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
    • F02M59/04—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
    • F02M59/06—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 special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps with cylinders arranged radially to driving shaft, e.g. in V or star arrangement
    • 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
    • F04B1/0448—Sealing means, e.g. for shafts or housings

Definitions

  • High-pressure fuel pump in particular for a fuel injection device of an internal combustion engine
  • the invention relates to a high-pressure fuel pump, in particular for a fuel injection device of an internal combustion engine according to the preamble of claim 1.
  • Such a high-pressure fuel pump is known from DE 10 2009 000 859 AI.
  • This high-pressure fuel pump has a housing part in which a pump piston is displaceably guided in a cylinder bore. With its first end region arranged in the cylinder bore, the pump piston delimits a pump working space and protrudes with its opposite second end region out of the cylinder bore. Between the second end portion and the housing part, a sealing element is arranged, which is secured to the housing part by means of a holding element in the form of a presser.
  • the second end portion of the pump piston is connected to a plunger, for example, a roller tappet, via which the pump piston is supported on a cam of a drive shaft, via which the pump piston is driven in a lifting movement.
  • the plunger is secured by means of a securing ring on the housing part such that the plunger and together with this the pump piston can perform the required stroke, but falling out of the pump piston is prevented from the cylinder bore.
  • the construction and assembly of the high-pressure fuel pump is complicated, since both the retaining element and the retaining ring must be made and assembled. This also leads to high production costs of the high-pressure fuel pump. Disclosure of the invention
  • Claim 1 has the advantage that it is easier and thus less expensive to manufacture and assemble, since only the retaining element is required, which holds both the sealing element and the pump piston in
  • Housing secures.
  • FIG. 1 shows a pump in a longitudinal section
  • Figure 2 shows a designated in Figure 1 with II section of
  • Figure 3 is a holding element in a perspective view.
  • the high-pressure fuel pump has at least one pump element 10 which, in turn, has a pump piston 12, which is at least indirectly connected by a drive shaft 14 in a lifting movement in an upward direction. at least approximately radial direction with respect to the axis of rotation 15 of the drive shaft 14 is driven.
  • the drive shaft 14 may be part of the pump or alternatively may also be provided that the pump does not have its own drive shaft and the drive shaft 14 is part of the internal combustion engine.
  • the drive shaft 14 may be, for example, a shaft of the internal combustion engine through which the gas exchange valves of the internal combustion engine are actuated.
  • the drive shaft 14 has a cam 16 or eccentric for driving the pump piston 12.
  • the pump has a pump housing, which may be designed in several parts.
  • the pump piston 12 is tightly guided in a cylinder bore 18 of a housing part 20 of the pump wherein the housing part 20 is referred to below as the cylinder head.
  • the pump piston 12 With its first end region remote from the drive shaft 14, the pump piston 12 delimits a pump working chamber 22 in the cylinder bore 18.
  • the pump working chamber 22 has an inlet valve 24, which can be an inlet check valve opening into the pump working chamber 22 or an electrically, in particular electromagnetically controlled valve Connection with a fuel delivery inlet 26, via which the pump working chamber 22 is filled at the radially inwardly to the rotational axis 15 of the drive shaft 14 directed suction stroke of the pump piston 12 with fuel.
  • the fuel delivery inlet 26 is fed, for example, by a feed pump 27, is conveyed by the fuel from a fuel tank 25.
  • the pump working chamber 22 also has an outlet valve 28, which is for example an outlet check valve opening out of the pump working chamber 22, a connection to a drain 30, which can lead to a high-pressure accumulator 32 and the radially outward from the axis of rotation 15 of the drive shaft 14 away pumping stroke of the pump piston 12 fuel is displaced from the pump working chamber 22.
  • the pump piston 12 is supported via a roller tappet 40 on the cam 16 of the
  • the roller tappet 40 has a tappet body 42 in which a roller 44 rolling on the cam 16 is rotatably mounted.
  • Plunger body 42 is acted upon by a spring 46 towards the cam 16 so that the roller 44 remains in contact with the cam 16 even during the suction stroke of the pump piston 12.
  • the pump piston 12 protrudes with its the pump working space 22 remote from the second end portion of the cylinder bore 18 and is coupled at its end to the plunger body 42, so that the pump piston 12 is also acted upon by the spring 46.
  • the pump piston 12 may have at its projecting from the cylinder bore 18 end a stepped piston diameter 45 in diameter.
  • the spring is supported by a spring plate 47 on the plunger body 42, wherein the spring plate 47 has a central opening 48 whose diameter is smaller than the diameter of the piston foot 45. About the spring plate 47 and this against the plunger body 42 pushing spring 46 is the Pump piston 12 via its piston 45 with the foot
  • the cylinder head 20 has in the region of the cylinder bore 18 to the cam 16 toward a cylinder bore 18 surrounding at least approximately cylindrical portion 50.
  • the spring 46 is formed as a cylindrical helical compression spring, surrounds the portion 50 of the cylinder head 20 and is supported on the cylinder head 20 from.
  • a sealing ring 52 is provided which surrounds the protruding from the cylinder bore 18 end portion of the pump piston 12 on its circumference.
  • the sealing ring 52 is under radial bias with at least one arranged on the inner circumference elastic sealing lip 54 on the pump piston 12 at.
  • the at least one sealing lip 54 preferably has a surface with a low coefficient of friction, at least in the region of its contact with the pump piston 12, in order to cause only slight frictional forces during the lifting movement of the pump piston 12.
  • the sealing ring 52 has two or three sealing lips 54 spaced from one another in the direction of the longitudinal axis 13 of the pump piston 12.
  • the sealing ring 52 is made of PTFE, polytetrafluoroethylene, for example.
  • the portion 50 of the cylinder head 20 has at its end to the cylinder bore 18 at least approximately coaxial bore 58 which has a larger diameter than the cylinder bore 18 and which forms a receptacle for the sealing ring 52.
  • an annular shoulder 60 is formed at the transition from the bore 58 to the cylinder bore 18.
  • the sealing ring 52 is in the receptacle 58 in Rieh- tion of the longitudinal axis 13 of the pump piston 12 is secured by a retaining element 64.
  • the holding element 64 shown in Figure 3 is sleeve-shaped, which has a closed ring 66, of which in the direction of the longitudinal axis 13 of the pump piston 12 at least one, preferably a plurality, for example as shown in Figure 3 three distributed over the circumference of the ring 66 arranged Support arms 68 protrude. At the end facing away from the ring 66 of each support arm 68 a approximately radially to the longitudinal axis 13 to the pump piston 12 projecting retaining web 70 is arranged. The pump piston 12 facing edge of each retaining web 70 is formed in a circular section. The retaining webs 70 are movable in the radial direction with respect to the longitudinal axis 13 by elastic deformation of the retaining arms 68.
  • a radially outwardly projecting latching lug 72 is arranged on each of these.
  • a recess is provided for each latching lug 72, wherein the recess is preferably formed by an annular groove 74.
  • Snap locking lugs 72 in the annular groove 74 are at their near the ring 66 lying end portions in which the locking lugs 72 are arranged, relatively stiff, so that after the engagement of the locking lugs 72 in the annular groove 74 a secure fixation of the retaining element 64 is reached.
  • the pump piston 12 has in its outside of the receptacle 58 arranged second end portion on a diameter reduction, through which an annular away from the receptacle 58 annular shoulder 76 is formed on the pump piston 12.
  • the holding arms 68 of the holding element 64 are arranged in their non-elastically deformed state such that the edges of their holding webs 70 are arranged on a diameter dl which is only slightly larger than the smaller diameter d of the second end region of the pump piston 12 and the is smaller than the larger diameter D of the pump piston 12.
  • the sealing ring 52 is inserted into the receptacle 58, then the retaining element 64 is inserted into the receptacle 58 until this with its detent nose 72 is engaged in the annular groove 74.
  • the pump piston 12 is connected to the plunger body 42 and the pump piston 12 is preceded by its first end portion by the holding member 64 and the sealing ring 52nd
  • the retaining arms 68 of the retaining element 64 pivot when elastically deformed when the pump piston 12 is pushed through, and when the reduced-diameter region of the pump piston 12 is arranged between them, the retaining arms 68 again pivot radially inwards toward the pump piston 12.
  • the pump piston 12 and with this the plunger body 42 can then no longer be pulled out of the cylinder bore 18, since in this case the holding webs 70 of the support arms 68 come to rest on the annular shoulder 76 of the pump piston 12.
  • the holding element 64 is formed in one piece and may be made of plastic, for example in an injection molding process. Alternatively, the holding member 64 may be made of metal, in particular of sheet metal by forming.
  • the pump piston 12 is driven in a lifting movement.
  • the annular shoulder 76 of the pump piston 12 and the retaining webs 70 of the support arms 68 of the support member 64 are spaced apart in the direction of the longitudinal axis 13 of the pump piston 12 so that the pump piston 12 can perform the required stroke between its bottom dead center and top dead center without the Holding webs 70 come to the annular shoulder 76 to the plant.
  • the holding element 64 is not fixed in the receptacle 58 of the housing part 20 by means of a latching connection but via a thread or a press connection. Furthermore, it may alternatively be provided that the holding element 64 is not fixed in the receptacle 58 but on the outer casing of the portion 50 of the housing part 20, for example by means of a latching, pressing or threaded connection.

Landscapes

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

Abstract

L'invention concerne une pompe qui possède une partie carter (20) dans laquelle un piston de pompe (12) est guidé en mobilité d'excursion dans un alésage de cylindre (18), lequel délimite un espace de travail de pompe (22) avec sa première zone d'extrémité disposée dans l'alésage de cylindre (18) et, avec sa deuxième zone d'extrémité opposée, fait saillie hors de l'alésage de cylindre (18). Entre la deuxième zone d'extrémité du piston de pompe (12) et la partie carter (20) est disposé un élément d'étanchéité (52) qui est retenu dans un logement (58) de la partie carter (20) au moyen d'un élément de maintien (64). Le piston de pompe (12) est retenu au moins indirectement au niveau de la partie carter (20) en permettant la mobilité d'excursion nécessaire. Le piston de pompe (12) est retenu au moins indirectement par l'élément de maintien (64) au niveau de la partie carter (20).
PCT/EP2016/050010 2015-03-11 2016-01-04 Pompe à haute pression de carburant, notamment pour un dispositif d'injection de carburant d'un moteur à combustion interne WO2016142072A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015204321.5A DE102015204321A1 (de) 2015-03-11 2015-03-11 Kraftstoffhochdruckpumpe, insbesondere für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
DE102015204321.5 2015-03-11

Publications (1)

Publication Number Publication Date
WO2016142072A1 true WO2016142072A1 (fr) 2016-09-15

Family

ID=55069877

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2016/050010 WO2016142072A1 (fr) 2015-03-11 2016-01-04 Pompe à haute pression de carburant, notamment pour un dispositif d'injection de carburant d'un moteur à combustion interne

Country Status (2)

Country Link
DE (1) DE102015204321A1 (fr)
WO (1) WO2016142072A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018203319A1 (de) * 2018-03-06 2019-09-12 Robert Bosch Gmbh Kraftstoff-Hochdruckpumpe

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1707799A1 (fr) * 2005-03-30 2006-10-04 Denso Corporation Pompe de carburant à plongeur et système d'alimentation en carburant utilisant la même
DE102009000859A1 (de) 2009-02-13 2010-08-19 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
DE102010030498A1 (de) * 2010-06-24 2011-12-29 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe
DE102013204347A1 (de) * 2013-03-13 2014-09-18 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffpumpe
DE102013207771A1 (de) * 2013-04-29 2014-10-30 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1707799A1 (fr) * 2005-03-30 2006-10-04 Denso Corporation Pompe de carburant à plongeur et système d'alimentation en carburant utilisant la même
DE102009000859A1 (de) 2009-02-13 2010-08-19 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
DE102010030498A1 (de) * 2010-06-24 2011-12-29 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffhochdruckpumpe
DE102013204347A1 (de) * 2013-03-13 2014-09-18 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffpumpe
DE102013207771A1 (de) * 2013-04-29 2014-10-30 Robert Bosch Gmbh Pumpe, insbesondere Kraftstoffpumpe

Also Published As

Publication number Publication date
DE102015204321A1 (de) 2016-09-15

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