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WO2016008626A1 - Pompe, en particulier pompe à carburant haute pression destinée à un système d'injection de carburant d'un moteur à combustion interne - Google Patents

Pompe, en particulier pompe à carburant haute pression destinée à un système d'injection de carburant d'un moteur à combustion interne Download PDF

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Publication number
WO2016008626A1
WO2016008626A1 PCT/EP2015/061401 EP2015061401W WO2016008626A1 WO 2016008626 A1 WO2016008626 A1 WO 2016008626A1 EP 2015061401 W EP2015061401 W EP 2015061401W WO 2016008626 A1 WO2016008626 A1 WO 2016008626A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
sealing ring
pump piston
cylinder bore
receptacle
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.)
Ceased
Application number
PCT/EP2015/061401
Other languages
German (de)
English (en)
Inventor
Matthias Greiner
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 WO2016008626A1 publication Critical patent/WO2016008626A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/143—Sealing provided on the piston

Definitions

  • the invention is based on a pump, in particular
  • Such a pump in the form of a high-pressure fuel pump and a
  • Fuel injection device is known from DE 10 2009 000 859 AI.
  • This pump has at least one pump element, which in turn has a pump piston driven in a stroke movement.
  • the pump piston is slidably guided in a cylinder bore of a housing part of the pump and limited in the cylinder bore a pump working space.
  • Pump piston protrudes with its end remote from the pump working space from the pump working RAM remote from the end of the cylinder bore.
  • a sealing ring is provided on the protruding from the cylinder bore end portion of the pump piston. The sealing ring serves to mix the pumped by the pump piston fuel with the outside of the
  • Cylinder bore of the housing part existing medium to avoid.
  • the medium present outside the cylinder bore of the housing part is in particular lubricating oil for lubricating a drive region, for example a roller tappet and its support on a cam.
  • the sealing ring has on its inner circumference at least one sealing lip, with which it bears against the pump piston.
  • the sealing ring is in a surrounding of the cylinder bore end region of the pump piston receptacle of the
  • the sealing ring is in the receptacle in the direction of the longitudinal axis of the pump piston by means of an annular retaining element secured.
  • the sealing ring is made of a material with high wear resistance, such as PTFE.
  • the sealing ring is usually inserted into the receptacle with radial prestressing in order to press the at least one sealing lip against the pump piston.
  • the sealing ring is arranged in the direction of the longitudinal axis of the pump piston with clearance between the receptacle and the holding element.
  • the pump according to the invention with the features of claim 1 has the advantage that the sealing ring is securely fixed in the receptacle in the direction of the longitudinal axis of the pump piston, wherein temperature-dependent changes in length of the sealing ring are compensated by the bias of the spring element, so that no movement of the sealing ring in axial direction in the recording occurs and thus during operation of the pump
  • Training according to claim 2 ensures that the sealing ring is not damaged by the spring element.
  • the embodiment of claim 4 or claim 5 allows a simple and inexpensive design of the spring element. drawing
  • FIG. 1 shows a pump in a longitudinal section and Figure 2 shows a designated II in Figure 1 section of the pump in an enlarged view according to a first embodiment and Figure 3 shows the detail according to a second embodiment.
  • FIG. 1 shows a simplified illustration of a pump, which is in particular a high-pressure fuel pump for a fuel injection device of an internal combustion engine.
  • the high-pressure fuel pump has at least one pump element 10, which in turn has a pump piston 12 which at least indirectly by a drive shaft 14 in a lifting movement in at least approximately radial direction with respect to the axis of rotation 15 of
  • 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, for example, a wave of
  • 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. With its end facing away from the drive shaft 14, the pump piston 12 in the cylinder bore 18 defines a pump working chamber 22.
  • the pump working chamber 22 has an inlet valve 24 which is inserted in the
  • Pumping chamber 22 may be opening into inlet check valve, a connection with an inlet 26, via which the pump 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 pump chamber 22 also has an outlet valve 28, for example, one of the Pump workspace 22 out opening outlet check valve is a connection to a drain 30, which can lead to a high-pressure accumulator 32 and on the radially outward from the axis of rotation 15 of
  • the pump piston 12 is supported via a roller tappet 40 on the cam 16 of the drive shaft 14.
  • 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 during the suction stroke of the pump piston 12.
  • the pump piston 12 protrudes with his
  • Pump piston 12 may have at its projecting from the cylinder bore 18 end in diameter relative to the guided in the cylinder bore 18 shaft enlarged piston 48.
  • 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 end region of the pump piston 12 projecting from the cylinder bore 18 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 a to
  • Cylinder bore 18 at least approximately coaxial bore 58, which has a larger diameter than the cylinder bore 18 and the one
  • the holding element 64 may also be formed, for example, as a disk, which is for example pressed into the receptacle 58 or fastened in some other way.
  • the sealing ring 52 is sleeve-shaped and on the inside of which at least one sealing lip 54 is formed.
  • the sealing ring 52 may each have an annular groove 70 at its two axial end faces pointing in the direction of the longitudinal axis 13 of the pump piston 12. By the annular grooves 70 it is achieved that the axial edge regions of the sealing ring 52 are radially elastically deformable.
  • a spring 72 may be inserted in the annular grooves 70, by which a radial bias of the sealing ring 52 is generated with its at least one sealing lip 54 on the pump piston 12.
  • the sealing ring 52 is arranged by a biased spring element 80 in the direction of the longitudinal axis 13 of the pump piston 12 without play in the receptacle 58 between the annular shoulder 60 and the support member 64.
  • the spring element 80 is disposed between the support member 64 and the sealing ring 52, the spring member 80 may be supported directly on the support member 64 and the sealing ring 52 or alternatively may between the support member 64 and the spring member 80 and / or between the sealing ring 52 and the
  • the spring element 80 is formed as a helical compression spring.
  • Spring element 180 is disposed between the sealing ring 52 and the annular shoulder 60.
  • the spring element 180 is designed as a plate spring.
  • the trained as a plate spring spring element 180 can also in the arrangement between the sealing ring 52 and the support member 64 as in the first
  • Helical compression spring spring member 80 also in the arrangement between the sealing ring 52 and the annular shoulder 60 according to the second
  • Embodiment be provided.
  • Sealing ring 52 and the inner shell of the receptacle 58 is a static seal, which prevents the lubricating oil from getting to the cylinder bore 18 and is dragged by the pump piston 12 in the stroke movement in the cylinder bore 18 and mixed with the fuel.
  • the outer shell of the sealing ring 52 may have at least one, for example, two sealing beads 56, with which this rests against the inner surface of the receptacle 58.
  • the two sealing beads 56 are preferably arranged near the ends of the sealing ring 52 pointing in the direction of the longitudinal axis 13.
  • the voltage applied to the pump piston 12 sealing lips 54 are arranged in the same direction in the direction of the longitudinal axis 13 as the sealing beads 56th

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 comportant au moins un élément de pompe (10) qui présente à son tour un piston de pompe (12) entraîné dans un mouvement alternatif, pouvant se déplacer dans un alésage (18) de cylindre d'un élément (20) du carter de la pompe dans lequel il délimite une chambre de travail de pompe (22). Le piston de pompe (12) dépasse par son extrémité opposée à la chambre de travail de pompe (22) hors de l'alésage (18) de cylindre. L'élément (20) de carter comporte une section (50) au moins à peu près cylindrique entourant la partie d'extrémité de l'alésage (18) de cylindre opposée à la chambre de travail de pompe (22). Sur la partie d'extrémité du piston de pompe (12) dépassant hors de l'alésage (18) de cylindre est agencée une bague d'étanchéité (52) qui repose sur le piston de pompe (12) par sa circonférence intérieure munie d'une lèvre d'étanchéité (54). La bague d'étanchéité (52) est agencée dans un logement (58, 60) de l'élément (20) de carter de pompe entourant la partie d'extrémité du piston de pompe (12) dépassant hors de l'alésage (18) de cylindre, et est maintenue dans le logement (58) dans la direction de l'axe longitudinal (13) du piston de pompe (12 au moyen d'un élément de retenue (64). Entre l'élément (20) de carter de pompe et la bague d'étanchéité (52) et/ou entre l'élément de retenue (64) et la bague d'étanchéité (52) est agencé un élément élastique précontraint (80) par lequel la bague d'étanchéité (52) est maintenue dans le logement (58, 60) sans jeu dans la direction de l'axe longitudinal (13) du piston de pompe (12).
PCT/EP2015/061401 2014-07-15 2015-05-22 Pompe, en particulier pompe à carburant haute pression destinée à un système d'injection de carburant d'un moteur à combustion interne Ceased WO2016008626A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014213715.2A DE102014213715A1 (de) 2014-07-15 2014-07-15 Pumpe, insbesondere Kraftstoffhochdruckpumpe für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
DE102014213715.2 2014-07-15

Publications (1)

Publication Number Publication Date
WO2016008626A1 true WO2016008626A1 (fr) 2016-01-21

Family

ID=53264666

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/061401 Ceased WO2016008626A1 (fr) 2014-07-15 2015-05-22 Pompe, en particulier pompe à carburant haute pression destinée à un système d'injection de carburant d'un moteur à combustion interne

Country Status (2)

Country Link
DE (1) DE102014213715A1 (fr)
WO (1) WO2016008626A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018200146B4 (de) * 2018-01-08 2019-11-28 Continental Automotive Gmbh Kraftstoffhochdruckpumpe für ein Kraftstoffeinspritzsystem

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785659A (en) * 1972-03-17 1974-01-15 Exxon Production Research Co Packing cartridge for reciprocating pump
DE2415848A1 (de) * 1974-04-02 1975-10-16 Balcke Duerr Ag Kolbenpumpe
DE102009000859A1 (de) * 2009-02-13 2010-08-19 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
US20100253007A1 (en) * 2007-03-28 2010-10-07 Clyde Union Inc. Zero Emissions Reciprocating Pump
WO2012122445A2 (fr) * 2011-03-10 2012-09-13 Waters Technologies Corporation Ensembles joints d'étanchéité pour des applications à va-et-vient et rotatives

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3785659A (en) * 1972-03-17 1974-01-15 Exxon Production Research Co Packing cartridge for reciprocating pump
DE2415848A1 (de) * 1974-04-02 1975-10-16 Balcke Duerr Ag Kolbenpumpe
US20100253007A1 (en) * 2007-03-28 2010-10-07 Clyde Union Inc. Zero Emissions Reciprocating Pump
DE102009000859A1 (de) * 2009-02-13 2010-08-19 Robert Bosch Gmbh Kraftstoffhochdruckpumpe
WO2012122445A2 (fr) * 2011-03-10 2012-09-13 Waters Technologies Corporation Ensembles joints d'étanchéité pour des applications à va-et-vient et rotatives

Also Published As

Publication number Publication date
DE102014213715A1 (de) 2016-01-21

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