WO2009156205A1 - Corps d'appui, clapet antiretour et pompe à carburant à haute pression - Google Patents

Corps d'appui, clapet antiretour et pompe à carburant à haute pression Download PDF

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Publication number
WO2009156205A1
WO2009156205A1 PCT/EP2009/054939 EP2009054939W WO2009156205A1 WO 2009156205 A1 WO2009156205 A1 WO 2009156205A1 EP 2009054939 W EP2009054939 W EP 2009054939W WO 2009156205 A1 WO2009156205 A1 WO 2009156205A1
Authority
WO
WIPO (PCT)
Prior art keywords
support body
pressing
pressure fuel
fuel pump
diameter
Prior art date
Application number
PCT/EP2009/054939
Other languages
German (de)
English (en)
Inventor
Angelo Santamaria
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 WO2009156205A1 publication Critical patent/WO2009156205A1/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
    • F02M59/44—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
    • F02M59/485—Means for fixing delivery valve casing and barrel to each other or to pump casing
    • 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
    • F02M59/46—Valves
    • F02M59/462—Delivery valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/025—Check valves with guided rigid valve members the valve being loaded by a spring
    • F16K15/026—Check valves with guided rigid valve members the valve being loaded by a spring the valve member being a movable body around which the medium flows when the valve is open
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves

Definitions

  • Support body check valve and high-pressure fuel pump
  • the invention relates to a support body according to the preamble of claim 1, a check valve according to claim 8 and a fuel injector according to claim 10.
  • a common rail injection system is known.
  • a high-pressure fuel pump supplies a fuel high-pressure accumulator (rail) with high-pressure fuel.
  • check valves which are opened by occurring in the pressure increase stroke hydraulic forces.
  • the check valves allow high pressure fuel to flow from the high pressure fuel pump to the high pressure fuel accumulator and from there to the fuel injectors.
  • the closing movement of the check valves is effected by hydraulic forces when reverse flow begins, the closing movement being assisted by a return spring.
  • the return spring of a known check valve for high-pressure fuel pumps is supported in the axial direction on a support body (pen holder).
  • the support body is by means of a press fit in a receiving bore of a cylinder head of the configured with the check valve force Substance high pressure pump set. To ensure that the supporting body does not change its position in the locating bore over the entire service life, the press fit must be able to absorb with sufficient certainty the flow forces, frequently exceeding 2000 N, which occur during the valve opening and closing process as the flow rate increases.
  • Known supporting bodies have between an axially outer, cylindrical insertion, which extends in known Abstützmaschinen over an insertion length of about 0.5 mm and a cylindrical pressing portion with a slightly larger pressing diameter on a Ein Industriesfase, wherein the angle between the lateral surface of the EinSciencefase and the lateral surface of the Introductory section viewed in the direction of the longitudinal extension of the support body is 175 °.
  • the weaker pressing partner deforms plastically, which should be avoided.
  • One purely elastic interference fit over a plastic interference fit the advantage that Dehn bine, for example due to temperature differences are at least partially compensated automatically.
  • a ratio of pressing diameter to pressing length (axial extension of the pressing section) of 35% in practice can not be exceeded.
  • the invention has for its object to propose an optimized support body, in which the risk of dithering effects and scuffing during the pressing process is minimized. It is preferable to be able to produce press dressings with the support body in which the ratio between the press diameter and the press length is above 35%. Furthermore, the object is to propose a check valve with a correspondingly optimized support body and a high pressure fuel pump with at least one such check valve.
  • the invention is based on the idea, the angle between see the lateral surface of, in particular cylindrical, insertion of the support body and the lateral surface of the, preferably conical, on the outer circumference of the support body axially between the pressing diameter having the pressing portion and the insertion, with the in the United arranged equal to the press diameter smaller insertion diameter, Ein Industriesfase viewed in the longitudinal direction of the support body from a range of values between 150 ° and 170 ° to choose.
  • an angle is spanned between the lateral surface of the insertion chamfer and the lateral surface of the insertion section from a range between 150 ° and 170 °.
  • the invention thus does not follow the previous approach to reduce coaxial errors by an improved, cost-intensive production technology to a minimum - rather the occurrence of previously common coaxial errors is accepted - it will only the negative effects of coaxial errors by choosing a compared to the prior art Increased angle between the lateral surface of the Einstockedfase and the lateral surface of the insertion of the support body minimized.
  • the angle between the lateral surface of the lead-in chamfer and the lateral surface of the insertion section of the support body is selected from a value range between 155 ° and 165 °. Optimized results with a view to minimizing jitter and foresight effects are achieved at an angle between 158 ° and 162 °.
  • the ratio between the press diameter and the Press length, over which the pressing diameter is realized is greater than 0.35.
  • the ratio is greater than 0.40, preferably greater than 0.45, more preferably greater than 0.50, most preferably greater than 0.55 is.
  • the (average) press length ie the average axial extent of the press section, is selected from a value range between about 6 mm and about 15 mm, preferably about 9 mm to about 11 mm.
  • the total length of the support body is about 13 mm to 14 mm.
  • an embodiment is preferred in which when the check valve is open fuel can flow centrally through the support body in the direction of the fuel high-pressure accumulator.
  • the support body has an axially continuous, through-channel.
  • An embodiment is preferred in which at least one inner annular shoulder is formed in the support body, against which the restoring spring of a check valve equipped with a support body can be supported in the axial direction.
  • the support body is mirror-symmetrical to a longitudinal center axis perpendicular intersecting mirror plane. This makes it possible to introduce the support body with any end first into the receiving bore of the holding body, whereby assembly errors can be minimized. In addition, the assembly logistics can be simplified. In particular, in the realization of such a mirror-symmetrical support body, the coaxial errors mentioned above due to the necessary Umspannens the support body in the production at reasonable production costs in the future probably hardly be avoided.
  • the invention also leads to a check valve, in particular for a high-pressure fuel pump of a common Rail injection system.
  • the check valve in this case comprises a return spring, against whose spring force a valve member is adjustable due to hydraulic forces.
  • the return spring is supported on a supporting body designed according to the concept of the invention, preferably on an inner annular shoulder.
  • An insertion chamfer of the support body arranged axially between an insertion section with an insertion diameter and a pressing section with a pressing diameter tensions an angle between a value range between approximately 150 ° and approximately 170 ° with the lateral surface of the preferably cylindrical insertion section.
  • the angle is selected from a value range between about 155 ° and about 165 °, more preferably between about 158 ° and about 162 °.
  • the counter to the spring force of the return spring adjustable valve member is formed on its valve seat of the check valve side facing as a spherical cap.
  • an embodiment with a bolt-shaped valve member or a valve ball can be realized.
  • the invention also leads to a high-pressure fuel pump for a common-rail injection system having at least one non-return valve explained above, which has a support body (spring holder) designed according to the concept of the invention.
  • the high-pressure fuel pump is preferably a piston pump, in particular a radial piston pump, with a multiplicity of pistons distributed over the circumference and driven by a cam drive.
  • Fig. 2a shows an enlarged representation of an axial end of the support body of FIG. 1 in an idealized representation without ⁇ overbased coaxial errors
  • Fig. 2b is an illustration of an axial end of the support body of Fig. 1 with coaxial and
  • Fig. 3 in a schematic representation of the unevenly occurring during a press-fitting of a trained according to the prior art support body forces.
  • a cylinder head 1 (holding body) of an otherwise not shown, designed as a radial piston pump, high pressure fuel pump is shown.
  • a fuel high-pressure accumulator (common rail), not shown, of the injection system is supplied with high-pressure fuel of preferably more than 2000 bar.
  • the high-pressure fuel pump 2 comprises a compressor piston 4, which can be moved back and forth in a guide bore 3 and which can be driven at its lower end 5 in the plane of the drawing by a cam drive, not shown, in a manner known per se.
  • the compressor piston 4 the fuel pressure in a compressor chamber 6 is increased.
  • the check valve 8 comprises a sleeve-shaped support body 10 which is fixed by means of a press fit in a receiving bore 11 in the cylinder head 1.
  • the support Body 10 is mirror-symmetrical to an indicated mirror plane S, which is cut perpendicularly from a longitudinal central axis L of the check valve 8 is formed.
  • the support body 10 has an axially continuous, centric view through passage 12 which is arranged concentrically to the longitudinal center axis L.
  • the passage channel 12 has a central portion 13, the cross-sectional area of the volume flow of the outflowing through the check valve 8, co-determined fuel quantity co-determined.
  • two mutually remote annular shoulders 14, 15 are formed, wherein in the installation situation shown in FIG.
  • the support body 10 is formed mirror-symmetrically to the mirror plane S, the support body 10 can be installed in a rotated compared to Fig. 1 by 180 ° position in the cylinder head 1, wherein the return spring 16 then at the in this case in the plane would be supported 15 left annular shoulder.
  • the return spring 16 On the side facing away from the support body 10, the return spring 16 is supported on an inner, annular shoulder 17 of a valve member 18.
  • the return spring 16 acts on the valve member 18 in the sequence in the direction of a valve seat 19 which is formed on the cylinder head 1, with a spring force.
  • a plurality of circumferentially distributed openings 20 are introduced through the fuel from the channel 9 radially inward into the interior of the valve member 18 and from there in the axial direction on to the passageway 12 in the support body 10 and therethrough Direction of the fuel high-pressure accumulator (Rail) can flow.
  • the valve member 18 In the shown Closed position, the valve member 18 abuts the valve seat 19, so that the compressor chamber 6 is hydraulically separated from the high-pressure fuel storage.
  • Fig. 2a the support body 10 of FIG. 1 is shown in a schematic incomplete representation in a view from the outside.
  • the length L E of the press-in section is in the illustrated embodiment about 0.5 mm.
  • the pressing length L P of the pressing portion 22 is about 9 mm in the embodiment of FIG. 2a.
  • the insertion section 21 is provided on the end side with a peripheral chamfer 24, which can also be dispensed with if required.
  • FIG. 2b the illustration according to FIG. 2a is shown with a coaxial error.
  • the coaxial error in the illustration according to FIG. 2b is approximately 0.025 mm between the longitudinal center axis of the insertion section 21 and the longitudinal center axis of the pressing section 22.
  • the result is that the pressing length L Pi of the pressing section 22 is slightly larger than in a region in the drawing plane at the top Press length L P2 in an area in the drawing plane below.

Landscapes

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

Abstract

L'invention concerne un corps d'appui (10) pour un ressort de rappel (16) d'un clapet antiretour (8), en particulier pour une pompe à carburant à haute pression (2) d'un système à rampe d'injection commune, avec une section d'introduction (21) présentant un diamètre d'introduction (DE) et avec une section ajustée (22) présentant un diamètre ajusté (DP) afin de réaliser un montage ajusté avec la face interne d'un alésage de réception (11) dans un corps de maintien et se situant axialement entre les chanfreins d'introduction (23). Il est prévu selon l'invention que l'angle (alpha) entre l'enveloppe (M) du chanfrein d'introduction (23) et l'enveloppe (ME) de la section d'introduction (21) soit sélectionné sur une plage angulaire entre 150° et 170°, si bien que le chanfrein forme un angle entre 10° et 30°.
PCT/EP2009/054939 2008-06-24 2009-04-24 Corps d'appui, clapet antiretour et pompe à carburant à haute pression WO2009156205A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008002611.5 2008-06-24
DE200810002611 DE102008002611A1 (de) 2008-06-24 2008-06-24 Abstützkörper, Rückschlagventil sowie Kraftstoff-Hochdruckpumpe

Publications (1)

Publication Number Publication Date
WO2009156205A1 true WO2009156205A1 (fr) 2009-12-30

Family

ID=41009322

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/054939 WO2009156205A1 (fr) 2008-06-24 2009-04-24 Corps d'appui, clapet antiretour et pompe à carburant à haute pression

Country Status (2)

Country Link
DE (1) DE102008002611A1 (fr)
WO (1) WO2009156205A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113669320A (zh) * 2021-08-12 2021-11-19 华侨大学 端面控制的液控单向阀配流径向柱塞液压装置及工作方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016219046A1 (de) * 2016-09-30 2018-04-05 Robert Bosch Gmbh Stößelbaugruppe für eine Radialkolbenpumpe, Radialkolbenpumpe
DE102018209399A1 (de) * 2018-06-13 2019-12-19 Continental Automotive Gmbh Rückschlagventil, hochdruckführendes Bauteil und Kraftstoffhochdruckpumpe

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE967934C (de) * 1953-01-30 1957-12-27 Kloeckner Humboldt Deutz Ag Vorrichtung zur Befestigung und Abdichtung des Entlastungsventil-Fuehrungskoerpers bei Kraftstoffeinspritzpumpen
DE19735371A1 (de) * 1997-08-14 1999-02-18 Siemens Ag Kraftstoffpumpe mit einem Pumpenzylinder
DE10036939A1 (de) * 2000-07-28 2002-02-21 Siemens Ag Rückschlagventil

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005053683A1 (de) 2005-11-10 2007-05-16 Bosch Gmbh Robert Kraftstoffeinspritzsystem für Brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE967934C (de) * 1953-01-30 1957-12-27 Kloeckner Humboldt Deutz Ag Vorrichtung zur Befestigung und Abdichtung des Entlastungsventil-Fuehrungskoerpers bei Kraftstoffeinspritzpumpen
DE19735371A1 (de) * 1997-08-14 1999-02-18 Siemens Ag Kraftstoffpumpe mit einem Pumpenzylinder
DE10036939A1 (de) * 2000-07-28 2002-02-21 Siemens Ag Rückschlagventil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113669320A (zh) * 2021-08-12 2021-11-19 华侨大学 端面控制的液控单向阀配流径向柱塞液压装置及工作方法

Also Published As

Publication number Publication date
DE102008002611A1 (de) 2009-12-31

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