WO2007031120A1 - Soupape de pression pour dispositif d'injection de carburant d'un moteur a combustion interne - Google Patents

Soupape de pression pour dispositif d'injection de carburant d'un moteur a combustion interne Download PDF

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Publication number
WO2007031120A1
WO2007031120A1 PCT/EP2006/004311 EP2006004311W WO2007031120A1 WO 2007031120 A1 WO2007031120 A1 WO 2007031120A1 EP 2006004311 W EP2006004311 W EP 2006004311W WO 2007031120 A1 WO2007031120 A1 WO 2007031120A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
pressure
fuel
pressure valve
housing
Prior art date
Application number
PCT/EP2006/004311
Other languages
German (de)
English (en)
Inventor
Horst Steinbinder
Christian Rabanus
Original Assignee
Schaeffler Kg
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 Schaeffler Kg filed Critical Schaeffler Kg
Publication of WO2007031120A1 publication Critical patent/WO2007031120A1/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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0023—Valves in the fuel supply and return system
    • F02M37/0029—Pressure regulator in the low pressure fuel system
    • 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
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil

Definitions

  • the invention relates to a pressure valve for a fuel injection device of an internal combustion engine.
  • the fuel injector includes a prefeed pump for delivering fuel from a fuel tank and a high pressure pump connected to the priming pump via a fuel line for fueling at least one fuel injector, the pressure valve communicating with a throttle and a fuel filter in a branching off of the fuel line and into the high pressure pump leading bypass pipe for cooling and / or lubrication of the high-pressure pump is arranged with fuel.
  • a pressure valve for a fuel injection device with a prefeed pump and a high pressure pump wherein the prefeed pump fuel from a fuel tank and forwards to the high pressure pump, which then builds up the actual injection pressure and the output side with the fuel injection valves of the fuel ei nspritzvor - Direction is connected.
  • the known pressure valve serves to block the secondary flow of fuel through the bypass line during the starting process of the internal combustion engine, so that the amount of fuel delivered by the prefeed pump is completely sufficient to increase the pressure of the high-pressure pump at its intake. running side is available.
  • This pressure valve is already designed as inexpensive producible and space-saving mountable in the bypass line check valve.
  • the cited document also proposes to integrate a possibly required in the bypass line throttle in the pressure valve.
  • the invention is therefore based on the object to avoid these disadvantages and thus a pressure valve for a fuel injection device to create, which can be arranged together with a throttle and a fuel filter to save space and cost in the bypass line.
  • this object is achieved in that the pressure valve is integrated together with the throttle and the fuel filter in a unit which can be mounted in the bypass line as a structural unit.
  • this solution has the advantage that reaching the bypass line residual dirt can be filtered out substantially space neutral, without the need for a separately manufactured and assembled component ,
  • the valve unit is a longitudinally movably guided in a cylindrical housing and hollow cylindrical valve piston with a valve piston bottom, a valve piston axially spaced in the housing mounted and hollow cylindrical support piston formed with a support piston bottom and a clamped between the valve piston bottom and the support piston bottom compression spring.
  • the housing, the valve piston and the support piston can advantageously be made low-weight and inexpensive as thin-walled sheet metal parts in a deep-drawing process.
  • the valve piston bottom is intended to seal a valve seat formed on a housing bottom of the housing in the closed state of the pressure valve and to have one or more openings which form the throttle when the pressure valve is open.
  • the openings may in this case be kidney-shaped and arranged on a circle which extends around the longitudinal axis of the valve unit.
  • the fuel filter is designed as a filter screen in the form of a plurality in the housing bottom or in the support piston bottom or both in the housing bottom and in the support piston bottom extending bores.
  • the bores are in a particularly preferred embodiment of the invention by means of a laser pulsed drilling method and formed substantially circular with a diameter in the range between 50 .mu.m and 200 .mu.m.
  • the introduction of microbores in metallic workpieces by means of laser drilling is known to those skilled in the field of manufacturing technology and is already used, inter alia, in the manufacture of filters and sieves. These are usually produced by so-called single-pulse drilling, in which the material to be removed is heated, melted and evaporated with a single high-energy laser pulse in a very short time. Due to the high vapor pressure in the borehole, the melt is then driven out of the borehole. This highly dynamic process can be repeated with high processing frequency, so that the filter screen can be produced in a short time with a suitable relative movement of laser optics to workpiece.
  • the housing bottom should have a circular ring, which merges in the region of the valve seat in a cylindrical shape, in which the between the throttle forming openings spherically shaped valve piston bottom, the valve seat sealingly protrudes.
  • the surface of the valve piston bottom pressurized by the fuel is smaller when the pressure valve is closed than when the pressure valve is open, so that the pressure valve opens only when a predetermined opening pressure is exceeded and only closes again when falling below a predetermined hold-open pressure, which is smaller than the opening pressure.
  • the opening pressure is expediently to be chosen so that the pressure valve opens only when the required to operate the high-pressure pump minimum operating pressure is reached in order not to delay the pressure required for a smooth starting process of the engine pressure build-up on the inlet side of the high-pressure pump.
  • the lower hold-open pressure in comparison ensures that the pressure valve in the opened state produces only a slight pressure loss in the secondary fuel flow and thus during normal operation of the internal combustion engine the greatest possible pressure prevails in the bypass pipe without the need for complicated control.
  • valve unit A free of additional fasteners and thus space-saving and cost-effective installation of the valve unit can finally be achieved by the valve unit by means of a L Lucasspress said between an outer circumferential surface of the housing and an inner circumferential surface of the bypass line in the bypass line can be fixed non-positively.
  • the positioning of the valve unit is of course also possible in housing parts of the high pressure pump immediately before the drive range.
  • FIG. 2 shows a first embodiment variant of the valve unit in longitudinal section
  • FIG. 4 shows a second variant of the valve unit in longitudinal section
  • Figure 5 shows the pressure valve according to Figure 4 in plan view
  • FIG. 6 shows the view Y and the detail Z according to FIG. 2 or FIG. 5.
  • FIG. 1 shows a fuel injection device 1 for an internal combustion engine, preferably designed as a diesel engine.
  • the fuel injection device 1 designed as a common rail system has a prefeed pump 2, through which fuel is conveyed from a fuel tank 3 via a fuel filter 4 and a fuel line 11 to a high-pressure pump 5.
  • the high-pressure pump 5 is followed by a distribution line 6, branch off from the individual lines 7 to fuel injection valves 8.
  • a downstream of the prefeed pump 2 leads from the fuel line 11 branching bypass line 9 in the high-pressure pump 5, which is preferably designed as a driven by a shaft 10 radial piston pump.
  • the fuel branched off via the bypass line 9 causes lubrication and cooling of the high-pressure pump 5 and its drive region.
  • the fuel used for these purposes then passes back to the fuel tank 3 via a discharge line 12 connected to the high-pressure pump 5.
  • a pressure valve 13 is arranged on the one hand, which accelerates the fuel pressure build-up generated by the high pressure pump 5 when starting the internal combustion engine by the pressure valve 13 is closed until reaching the minimum operating pressure of the high pressure pump 5 and interrupts the secondary fuel flow.
  • a throttle 14 is arranged downstream of the pressure valve 13, which limits the over the bypass line 9 with the pressure valve 13 open flowing secondary fuel flow during operation of the internal combustion engine.
  • a fuel filter 15 is provided, through which the initially described, manufacturing residual dirt downstream of the fuel filter 4 and other impurities that are not retained by the fuel filter 4, filtered out and kept away from the drive range of the high-pressure pump 5.
  • valve unit 17 which can be mounted as a structural unit 16 in the bypass line 9 and which is described in more detail with reference to embodiments shown in the following figures.
  • a first embodiment variant of a valve unit 17a is disclosed in FIG.
  • the valve unit 17a consists of a cylindrical housing 18a, a longitudinally movably guided in the housing 18a and a hollow cylindrical valve piston 19 and a hollow cylindrical support piston 20a, all of which are made as thin-walled sheet metal parts in a deep drawing process. Between a valve piston bottom 21 of the valve piston 19 and a support piston bottom 22a of the support piston 20a, a compression spring 23 is clamped. The support piston 20a is mounted axially spaced from the valve piston 19 and serves to limit the stroke of the valve piston 19. The valve unit 17a is fastened in the bypass line 9 by means of a longitudinal compression dressing between an outer circumferential surface 24 of the housing 18a and an inner lateral surface 25 of the bypass line 9.
  • valve piston bottom 21 seals a valve seat 27 formed on a housing bottom 26a of the housing 18a.
  • the secondary fuel flow passes through the valve unit 17a in the direction of the arrow and is thereby limited by a throttle 28 which is formed by openings 29 in the valve piston bottom 21.
  • the openings 29 are kidney-shaped and arranged on a circle which runs around the longitudinal axis 30 of the valve unit 17a.
  • the characteristic of opening pressure and holding pressure of the pressure valve 17a described above is achieved in that the housing bottom 26a has a circular ring 31, which merges in the region of the valve seat 27 in a cylindrical shape 32a, into which the valve piston 21 protrudes spherically shaped between the openings 29.
  • the pressurized surface of the valve piston bottom 21 is closed with the pressure valve 13 smaller than when the pressure valve 13 is open in accordance with a larger than the open holding pressure opening pressure.
  • the secondary fuel flow leaves the valve unit 17a via the opening 33 formed in the support piston bottom 22a, wherein an end face 34 of the support piston 20a facing the valve piston 19 serves as a stop for the valve piston 19. Furthermore, as an axial stop for the support piston 20a an annular bottom portion 35 of the housing 18a is provided, which is preferably made by a crimping of the previously continuous cup-shaped housing 18a.
  • the fuel filter 15 is in this embodiment - viewed in the direction of the fuel side stream - at the entrance of the valve unit 17 a.
  • the fuel filter 15 is formed as a screen filter 36 in the form of a plurality of bores 37 which extend here in the housing bottom 26a between the cylindrical shape 32a.
  • the holes 37 shown in FIG. 6 in a greatly enlarged detail are essentially circular in shape by means of the laser pulse drilling method described above and have a diameter which is preferably in the range between 50 ⁇ m and 200 ⁇ m. Depending on the requirements of the fuel filter 15, however, smaller or larger holes 37 are conceivable and can also be produced without problems using the method mentioned.
  • a second embodiment variant of a valve unit 17b which is shown in FIGS. 4 and 5, essentially differs from the embodiment described above in that the fuel filter 15 is arranged downstream of the pressure valve 13 and the throttle 28 at the outlet of the valve unit 17b.
  • a cylindrical shape 32b of a housing bottom 26b of a housing 18b is designed to be open, while the bores 37 likewise produced by the laser pulse drilling method and forming the sieve filter 36 run in a continuous support piston bottom 22b of a support piston 20b.
  • An advantage of the thus formed valve unit 17b is compared to the first embodiment, on the one hand, that the to form the screen filter 36 available surface on the support piston bottom 22b is greater than that in the region of the cylindrical shape 32a of the housing bottom 26a ( Figure 2).
  • the number of holes 37 in the mesh filter 36 can be increased to minimize the risk of clogging of the valve unit 17b due to a completely contaminated mesh filter 36.
  • a combination of the different embodiments may be provided, in which case the fuel filter 15 is formed both at the entrance and at the outlet of the valve unit 17.
  • Valve piston a, b support piston

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

Abstract

L'invention concerne une soupape de pression (13) pour un dispositif d'injection de carburant (1) d'un moteur à combustion interne. Le dispositif d'injection de carburant (1) comprend une pompe de pré-alimentation (2) pour l'alimentation en carburant provenant d'un réservoir de carburant (3), et une pompe haute pression (5) reliée avec la pompe de pré-alimentation (2) via un conduit de carburant (11), pour l'alimentation en carburant d'au moins une soupape d'injection de carburant (8), caractérisée en ce que la soupape de pression (13) est disposée, conjointement avec un gicleur (14) et un filtre à carburant (15), dans un conduit de dérivation (9), ramifié du conduit de carburant (11) et conduisant à la pompe haute pression (5), pour le refroidissement et/ou le graissage de la pompe haute pression avec le carburant. De ce fait, la soupape de pression (13) est intégrée, conjointement avec le gicleur (14) et le filtre à carburant (15), dans une unité de valve (17, 17a, 17b) pouvant être montée, sous forme d'une unité (16), dans le conduit de dérivation (9).
PCT/EP2006/004311 2005-05-18 2006-05-09 Soupape de pression pour dispositif d'injection de carburant d'un moteur a combustion interne WO2007031120A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510022738 DE102005022738A1 (de) 2005-05-18 2005-05-18 Druckventil für eine Kraftstoffeinspritzvorrichtung einer Brennkraftmaschine
DE102005022738.4 2005-05-18

Publications (1)

Publication Number Publication Date
WO2007031120A1 true WO2007031120A1 (fr) 2007-03-22

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PCT/EP2006/004311 WO2007031120A1 (fr) 2005-05-18 2006-05-09 Soupape de pression pour dispositif d'injection de carburant d'un moteur a combustion interne

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DE (1) DE102005022738A1 (fr)
WO (1) WO2007031120A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2017462A1 (fr) 2007-06-21 2009-01-21 Ford Global Technologies, LLC Procédé et appareil pour nettoyer une ligne de fluide

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014006029C5 (de) 2014-04-24 2023-08-10 Hydac Electronic Gmbh Austragsystem
DE102016219631A1 (de) * 2016-10-10 2018-04-12 Robert Bosch Gmbh Überströmventil, insbesondere für eine Hochdruckpumpe, sowie Hochdruckpumpe und Kraftstoffeinspritzsystem
CN111963752A (zh) * 2020-09-04 2020-11-20 刘舜 一种塑料管件阀门

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19933567C1 (de) * 1999-07-16 2001-02-01 Siemens Ag Einspritzsystem für eine Brennkraftmaschine
DE10057786A1 (de) * 2000-11-22 2002-06-06 Siemens Ag Einspritzsystem für eine Brennkraftmaschine und Verfahren zum Regeln und/oder Entlüften eines solchen Einspritzsystems
DE10239429A1 (de) * 2002-08-28 2004-03-11 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19933567C1 (de) * 1999-07-16 2001-02-01 Siemens Ag Einspritzsystem für eine Brennkraftmaschine
DE10057786A1 (de) * 2000-11-22 2002-06-06 Siemens Ag Einspritzsystem für eine Brennkraftmaschine und Verfahren zum Regeln und/oder Entlüften eines solchen Einspritzsystems
DE10239429A1 (de) * 2002-08-28 2004-03-11 Robert Bosch Gmbh Kraftstoffeinspritzeinrichtung für eine Brennkraftmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2017462A1 (fr) 2007-06-21 2009-01-21 Ford Global Technologies, LLC Procédé et appareil pour nettoyer une ligne de fluide

Also Published As

Publication number Publication date
DE102005022738A1 (de) 2006-11-23

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