EP1144843A1 - Injecteur du systeme d'injection de carburant de moteurs a combustion interne dote d'une precontrainte hydraulique du dispositif demultiplicateur de pression - Google Patents

Injecteur du systeme d'injection de carburant de moteurs a combustion interne dote d'une precontrainte hydraulique du dispositif demultiplicateur de pression

Info

Publication number
EP1144843A1
EP1144843A1 EP00984824A EP00984824A EP1144843A1 EP 1144843 A1 EP1144843 A1 EP 1144843A1 EP 00984824 A EP00984824 A EP 00984824A EP 00984824 A EP00984824 A EP 00984824A EP 1144843 A1 EP1144843 A1 EP 1144843A1
Authority
EP
European Patent Office
Prior art keywords
pressure
piston
actuator
injector according
guide bore
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.)
Granted
Application number
EP00984824A
Other languages
German (de)
English (en)
Other versions
EP1144843B1 (fr
Inventor
Patrick Mattes
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 EP1144843A1 publication Critical patent/EP1144843A1/fr
Application granted granted Critical
Publication of EP1144843B1 publication Critical patent/EP1144843B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • 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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/705—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for filling or emptying hydraulic chamber, e.g. for compensating clearance or thermal expansion

Definitions

  • the invention relates to an injector for a
  • Fuel injection system for internal combustion engines with one
  • Pressure intensifier ⁇ which has a first piston guided in a first guide bore and a second piston guided in a second guide bore, the first piston and the second piston delimiting a pressure space which is at least under a supply pressure, and with a leakage oil return and wherein the first piston is actuated by an actuator and the second piston actuates at least indirectly the actuator of a control valve and a fuel injection system for internal combustion engines according to the preamble of claim 12.
  • the second piston of the hydraulic pressure intensifier has so far been pressed against the actuator of the control valve by a spring, for example a plate spring.
  • a spring for example a plate spring.
  • the invention has for its object to provide an injector for a fuel injection system for internal combustion engines with a pressure intensifier with improved performance.
  • an injector for a fuel injection system for internal combustion engines with a pressure intensifier which has a first piston guided in a first guide bore and a second piston guided in a second guide bore, the first piston and the second piston having at least one Limit the supply pressure standing space, and with a
  • Leakage oil return the first piston being actuated by an actuator and the second piston actuating the control element of a control valve at least indirectly, the second guide bore being hydraulically connected to the leakage oil return and the pressure p x im
  • Leak oil return always acts on the second piston a hydraulic force that presses the second piston on the actuator of the control valve. This not only ensures a defined position of the second piston of the hydraulic pressure booster, but also ensures that the pressure booster in the pressure booster is constantly replaced Fuel or possibly existing air pockets. This improves the operating behavior and in particular the starting behavior of the internal combustion engine.
  • the first guide bore, the first piston and the housing in particular with a bellows, are sealed against the environment, so that no leaks occur and the supply pressure in the pressure chamber remains high.
  • the supply pressure in the pressure chamber is provided by a supply line opening into the space formed by the housing, bellows and first piston, so that all lines (31, 25, 27) and spaces (34, 17, 29) always have fuel flowing through them.
  • a pressure holding valve is arranged in the supply line, so that the pressure p 2 in the supply line is limited, in particular to 50 bar.
  • Another embodiment has a recess in the second guide bore, which is connected to the leakage oil return, so that the control and leakage quantities can be listed without problems.
  • the second piston actuates the actuator of the control valve via a tappet, so that the sections of the second guide bore which guide the second piston and tappet are not exactly must align and different tolerances are possible.
  • the outlet side of the control valve opens into the leakage oil return, so that the control quantity is discharged.
  • the actuator is a piezo actuator, so that large control forces are available.
  • Another embodiment provides for the housing, the control valve and the actuator to be mounted in a holding body, so that on the one hand manufacture and assembly are facilitated and on the other hand a play-free and prestressed connection of the components is achieved.
  • an embodiment of an injector according to the invention with a hydraulic pressure booster is shown.
  • a first guide bore 5 and a second guide bore 7 are arranged coaxially to one another in a two-part housing 1 and 3.
  • a first piston 9 is guided in the first guide bore 5.
  • the second guide bore 7 guides a second piston 11 and a plunger 13.
  • the second piston 11 acts via the plunger 13 on the spherical actuator 15 of the control valve of the injector, not shown. Due to the two-part design of the second piston 11 and plunger 13, the two sections of the second guide bore 7 do not have to be exactly aligned; in addition, the game between second piston 11 and second guide bore 7 and plunger 13 and second guide bore 7 can be selected differently.
  • the first piston 9 and the second piston 11 delimit a pressure chamber 17 of a hydraulic pressure booster 19.
  • a piezo actuator 21 acts on the first piston 9. When the piezo actuator 21 is actuated, it presses the first piston 9 in the direction of the arrow into the pressure chamber 17. As soon as the thereby increasing pressure in the pressure chamber 17 is sufficient to exert a hydraulic force on the end face of the second piston 11 projecting into the pressure chamber 17, which hydraulic force is greater than the hydraulic force which the fuel under control pressure exerts on the actuator 15 in the control chamber 23 the actuator 15 and provides a hydraulic
  • control room 23 connects to a leak oil return 25.
  • This connection takes place via a section of the second guide bore 7, a connecting line 27 and a recess 29 of the second guide bore 7.
  • the pressure in the control chamber 23 drops and the injection nozzle (not shown) opens.
  • the actuation of the piezo actuator 21 ends, it moves back together with the first piston 9 against the direction of the arrow into its starting position.
  • the pressure in the pressure chamber 17 drops.
  • a supply line 31, in which there is a supply pressure p 2 supplies via a
  • the housing 1 and the first piston 9 are sealed from the surroundings by the bellows 33.
  • Supply line 31 opens into the space (34) delimited by housing 1, first piston 9 and bellows 33 and fills it with fuel under pressure p 2 .
  • Fuel enters pressure chamber 17 through the annular gap between first guide bore 5 and first piston 9, so that it is always filled with fuel and there is at least approximately a pressure of the amount p 2 in pressure chamber 17.
  • Another advantage of the embodiment according to the invention is that the bellows, in contrast to the prior art, is only subjected to static pressure. This results in a possible indication of the supply pressure p 2 without the bellows 33 having to be changed, and thus an increase in the pretension of the piezo actuator.
  • the supply pressure p 2 can be, for example, 50 bar.
  • the entire injector consisting of piezo actuator 21, pressure intensifier 19 and the control valve (not shown) and the actual injection nozzle are held together by a holding body 35.
  • the fuel flowing from the supply line 31 through the holding body 35 is separated by two O-rings
  • Holding body 35 and housing 1 are arranged, prevented from flowing into the environment.
  • a pressure holding valve 37 is arranged in the supply line 31, which ensures that in the

Landscapes

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

Abstract

L'invention concerne un injecteur du système d'injection de carburant de moteurs à combustion interne. Cet injecteur comprend un dispositif hydraulique démultiplicateur de pression et il est actionné par un piézo-actionneur. Le dispositif démultiplicateur de pression est systématiquement précontraint par voie hydraulique.
EP00984824A 1999-10-23 2000-10-12 Injecteur du systeme d'injection de carburant de moteurs a combustion interne dote d'une precontrainte hydraulique du dispositif demultiplicateur de pression Expired - Lifetime EP1144843B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19951144A DE19951144A1 (de) 1999-10-23 1999-10-23 Injektor für ein Kraftstoffeinspritzsystem für Brennkraftmaschinen mit hydraulischer Vorspannung des Druckübersetzers
DE19951144 1999-10-23
PCT/DE2000/003582 WO2001031192A1 (fr) 1999-10-23 2000-10-12 Injecteur du systeme d'injection de carburant de moteurs a combustion interne dote d'une precontrainte hydraulique du dispositif demultiplicateur de pression

Publications (2)

Publication Number Publication Date
EP1144843A1 true EP1144843A1 (fr) 2001-10-17
EP1144843B1 EP1144843B1 (fr) 2005-03-30

Family

ID=7926672

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00984824A Expired - Lifetime EP1144843B1 (fr) 1999-10-23 2000-10-12 Injecteur du systeme d'injection de carburant de moteurs a combustion interne dote d'une precontrainte hydraulique du dispositif demultiplicateur de pression

Country Status (6)

Country Link
US (1) US6752324B1 (fr)
EP (1) EP1144843B1 (fr)
JP (1) JP2003513196A (fr)
CZ (1) CZ295497B6 (fr)
DE (2) DE19951144A1 (fr)
WO (1) WO2001031192A1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10333695A1 (de) * 2003-07-24 2005-03-03 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE10333697A1 (de) 2003-07-24 2005-02-24 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE10333696A1 (de) * 2003-07-24 2005-02-24 Robert Bosch Gmbh Kraftstoffeinspritzvorrichtung
DE102005026967B4 (de) * 2005-06-10 2014-09-25 Siemens Aktiengesellschaft Ventil, insbesondere Servoventil
JP2007255328A (ja) * 2006-03-23 2007-10-04 Toyota Motor Corp 噴射燃料増圧装置
JP4635980B2 (ja) * 2006-08-03 2011-02-23 トヨタ自動車株式会社 燃料供給システム
DE102007008262A1 (de) * 2007-02-20 2008-08-21 Robert Bosch Gmbh Kraftstoffeinspritzventil zur Kraftstoffeinspritzung in Brennkraftmaschinen
US8074625B2 (en) 2008-01-07 2011-12-13 Mcalister Technologies, Llc Fuel injector actuator assemblies and associated methods of use and manufacture
US9309846B2 (en) 2012-11-12 2016-04-12 Mcalister Technologies, Llc Motion modifiers for fuel injection systems
US20140131466A1 (en) 2012-11-12 2014-05-15 Advanced Green Innovations, LLC Hydraulic displacement amplifiers for fuel injectors
WO2014144807A1 (fr) * 2012-11-12 2014-09-18 Mcalister Technologies, Llc Systèmes et procédés permettant une compensation et une amplification de mouvement par déplacement de fluide
DE102014220890A1 (de) * 2014-10-15 2016-04-21 Continental Automotive Gmbh Einspritzventil zum Einspritzen von Fluid in einen Brennraum einer Brennkraftmaschine
DE102015226326A1 (de) * 2015-12-21 2017-06-22 Robert Bosch Gmbh Hydraulische Kopplereinrichtung und Kraftstoffeinspritzventil mit einer solchen

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH434875A (de) 1966-06-21 1967-04-30 Huber Robert Brennstoff-Einspritzventil mit elektromagnetischer Betätigung
JPH0656162B2 (ja) 1987-03-03 1994-07-27 トヨタ自動車株式会社 ストロ−ク可変装置
US4899935A (en) * 1988-03-14 1990-02-13 Yamaha Hatsudoki Kabushiki Kaisha Valve support for accumulator type fuel injection nozzle
DE4336108C1 (de) * 1993-10-22 1994-12-01 Daimler Benz Ag Magnetvenitl an einer für Brennkraftmaschinen vorgesehenen Kraftstoffeinspritzdüse
US5641121A (en) * 1995-06-21 1997-06-24 Servojet Products International Conversion of non-accumulator-type hydraulic electronic unit injector to accumulator-type hydraulic electronic unit injector
US5823429A (en) * 1996-07-12 1998-10-20 Servojet Products International Hybrid hydraulic electronic unit injector
JP3823391B2 (ja) * 1996-08-31 2006-09-20 いすゞ自動車株式会社 エンジンの燃料噴射装置
IT1293433B1 (it) 1997-07-11 1999-03-01 Elasis Sistema Ricerca Fiat Valvola di dosaggio registrabile per un iniettore di combustibile per motori a combustione interna, e relativo metodo di registrazione.
DE19807903C2 (de) * 1998-02-25 2001-11-29 Siemens Ag Vorrichtung und Verfahren zur Kraftübertragung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0131192A1 *

Also Published As

Publication number Publication date
EP1144843B1 (fr) 2005-03-30
JP2003513196A (ja) 2003-04-08
CZ20012296A3 (cs) 2002-06-12
CZ295497B6 (cs) 2005-08-17
DE50009921D1 (de) 2005-05-04
DE19951144A1 (de) 2001-04-26
WO2001031192A1 (fr) 2001-05-03
US6752324B1 (en) 2004-06-22

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