EP1544454A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP1544454A1
EP1544454A1 EP04105054A EP04105054A EP1544454A1 EP 1544454 A1 EP1544454 A1 EP 1544454A1 EP 04105054 A EP04105054 A EP 04105054A EP 04105054 A EP04105054 A EP 04105054A EP 1544454 A1 EP1544454 A1 EP 1544454A1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
injection valve
coupler
valve according
section
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
EP04105054A
Other languages
German (de)
English (en)
Other versions
EP1544454B1 (fr
Inventor
Walter Maeurer
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 EP1544454A1 publication Critical patent/EP1544454A1/fr
Application granted granted Critical
Publication of EP1544454B1 publication Critical patent/EP1544454B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series the valves opening in direction of fuel flow
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167Means for compensating clearance or thermal expansion

Definitions

  • the invention is based on a fuel injection valve according to the preamble of the main claim.
  • Coupler in particular hydraulically operated coupler in Fuel injection valves with piezo drive, for Compensation of temperature and pressure related Length changes of components, in particular of the actuator, as well as length changes due to wear, are from the Known in the art.
  • a Fuel injection valve with a piezoelectric actuator known which in operative connection with a valve needle stands.
  • the valve needle has at its discharge end a valve closing body, which with a Valve seat surface cooperates to a sealing seat.
  • One Coupler which compensates for changes in length of Components of the fuel injection valve, in particular of temperature-related changes in length of the actuator, serves, is arranged between the valve needle and the actuator.
  • the Coupler has two mutually axially movable sections or piston, the two annular gaps and a hydraulic volume form.
  • the annular gaps connect the hydraulic volume with the fuel-filled interior of the Valve body.
  • Fuel is added or released via the annular gaps.
  • the fuel injection valve according to the invention with the Features of the main claim has the advantage over that at relatively low preload forces high Coupler internal pressures can be achieved.
  • the Cavitation tendency of the hydraulic medium is at at the same time good valve dynamics and low Component dimensions very low.
  • the durability and Reliability and valve dynamics of the Fuel injector thereby become as well improved.
  • the preload forces can be more accurate and be adjusted more easily.
  • the pressure element is spiral and permanently elastic.
  • the pressure element can be arranged advantageously compact and the Preload force can hold permanently constant.
  • the first coupler section and the second coupler section is cylindrically shaped are, the gap is formed as an annular gap and the Recess is shaped hollow cylindrical. This can be done
  • the coupler is particularly simple, compact and easy to set up.
  • the first section tapers in a cylindrical extension of the hydraulic volume directed away.
  • the pressure element can be particularly place it favorably, but it is particularly favorable that the extension also by a step at the height of the Upper edge of the recess tapers and the extension coaxial is arranged to the first section.
  • the extension has an axial extending channel having a thereto with a Radial direction share extending opening with the Compensation space is connected.
  • the coupler can be characterized fill with hydraulic medium in a particularly simple manner and close by a spherical body.
  • the can Compensation space made especially easy and beneficial to be placed. This can be further improved by: one end of the flexible section between the first Section and the first holder and / or the other end of the flexible section between the second section and the second holder is clamped.
  • the on the flexible section acting pressure can be characterized distribute more evenly and the coupler can be more compact shape, as well as by the sleeve-shaped training at least one of the holders.
  • the second holder tapers stepped. This is a very compact and simple Construction of the coupler possible.
  • the first holder on his round off the end facing the first section is thereby less burdened and permanently durable.
  • the hydraulic volume in addition to the gap, with the compensation space by at least connected to a throttle bore.
  • the hydraulic Properties of the coupler can be advantageous and easily influence and adjust easily.
  • Inventive fuel injection valve 1 is used in particular for the direct injection of fuel into a combustion chamber of a mixture-compressing, spark-ignited Internal combustion engine.
  • a Valve needle 8 In a step down in the direction of injection tapered hollow cylindrical valve housing 38 are a Valve needle 8, an actuator 2 and a hydraulic coupler. 3 each arranged coaxially with each other.
  • the housing 38 On the inflow side the housing 38 is hermetically sealed by a housing cover 4 tightly closed.
  • the housing cover 4 On the housing cover 4 is based on the Inside the actuator 2 with its inflow end from. Downstream, the actuator 2 has a disc-shaped Actuator head 10 on.
  • the actuator head 10 is in one hollow cylindrical actuator module housing 9 axially movable guided.
  • the actuator housing 5 is downstream with the Valve needle 8 via a bellows 39 connected to the Actuator chamber 42 hermetically seals from the fuel.
  • One second spring element 22 is between the actuator head 10 and clamped the second flange 15 with a bias and keeps the actuator head 10 in constant contact with the actuator 2.
  • the hydraulic Coupler 3 between the actuator 2 and the valve needle. 8 arranged, wherein a first cylindrical coupler section 23 on the inflow side and a second cylindrical Coupler section 24 are arranged downstream. Of the first smaller diameter coupler section 23 engages a coaxial in the second section 24 on the inflow side arranged hollow cylindrical recess 16 partially. Surrounding the first coupler section 23, between the first and second coupler sections 23, 24 are formed while a gap 27 designed as an annular gap. The gap 27 connects one between the opposite axial inner surfaces of first and second coupler section 23, 24 lying hydraulic volume 17 and a Compensation space 21.
  • the size of the hydraulic volume 17 is through the against each other axially displaceable two coupler sections 23, 24 variable.
  • the first coupler section 23 has a coaxially arranged cylindrical or rod-shaped extension 32.
  • the extension 32 is on the axial side directed away from the hydraulic volume 17 of the first coupler section 23, ie towards the actuator 2, arranged. In the embodiment shown tapers the first coupler section 23 by an approximately level with the Upper edge of the recess 16 lying stage 33 to the Projection 32.
  • a in the extension 32 axially and coaxially extending channel 26, for example, by drilling is made by one in the wall of the Extension 32 arranged opening 34 with the compensation chamber 21 connected.
  • On the inflow side of the extension 32 engages up to Actuator 10 partially into the actuator housing 9 and is with the actuator head 10 joined, for example, fabric or a force fit.
  • the flexible one Section 25, the first coupler section 23 with the Extension 32 and the second coupler section 24 limit in this way the compensation chamber 21st
  • a first sleeve-shaped holder 29 is above the extension 32nd slipped and clamped the flexible portion 25 in the area its inner circumference between itself and the projection 32 form- and / or non-positively and hermetically tight. That the flexible portion 25 facing and resting on it End of the first holder 29 is rounded.
  • the first holder 29 is immovable with the extension 32, for example connected by a weld.
  • a second sleeve-shaped holder 30 engages with a downstream axial portion of the second coupler section 24 and is here with the radial outer surface of the second coupler section 24, for example by a Welding joined.
  • the area of the outer circumference of the flexible portion 25 is between the downstream side axial portion of the second holder 30 and the second Coupler section 24 hermetically sealed.
  • One around the Extension 32 circumferential axial portion of the second Holder 30 tapers stepwise, the inflow-side end diameter-reducing to a feeder 37 is retracted while surrounding the extension 32 radially.
  • the flexible portion 25 and thus the compensation chamber 21st or the hydraulic medium located in the compensation chamber 21 is by a biasing pressure element 28 pressurized.
  • the one shown in the picture Embodiment spiral and permanently elastic Pressure element 28 presses with one end over Interposing element 31 on the flexible portion 25 of outside the compensation chamber 21 and supports itself with the other end at the second coupler section 24th immovably connected second holder 30 on the feeder 37 from.
  • the other end is supported the pressure element 28 on with the first coupler section 23rd immovably connected first holder 29 from.
  • the intermediate layer member 31 is in this embodiment annular, surrounds the extension 32 radially and is connected to the The flexible portion 25 touching surfaces rounded.
  • the compensation chamber 21 is adjacent to the gap 27 by a arranged axially in the second coupler section 24 Throttle bore 36 connected to the hydraulic volume 17.
  • the compensation chamber 21, the gap 27, the opening 34 and the Channel 26 are completely filled with the hydraulic medium, which is filled through the channel 26.
  • the channel 26 is after filling by a ball body 35 pressure-resistant locked.
  • the valve needle 8 has a Valve-closing body 7 and engages through an am discharge-side end of the housing 38 is arranged Valve seat body 6.
  • the valve seat body 6 has a centered ejection opening 12 and a Valve seat surface 13, which communicates with the valve closing body. 7 cooperates to a sealing seat.
  • the fuel injector 1 opens to the outside.
  • the actuator 2 via an electrical, not shown Direction excited, it expands quickly. Since that Hydraulic medium not fast enough through the gap 27 and drain the throttle bore 36 from the hydraulic volume 17 can, the coupler 3 behaves very hard, causing the Linear expansion of the actuator 2 almost completely on the Valve needle 8 acts.
  • the valve needle 8 is opposite to the Biasing force of the first spring element 20 axially in Abspritzetti moves. This opens the sealing seat and the pressurized fuel is supplied via the Spray opening 12 in the combustion chamber, not shown hosed. Slow changes in length of the actuator 2 become by exchanging hydraulic medium between the Hydraulic volume 17 and the compensation chamber 21 balanced.
  • the pressure in the expansion chamber 21 results from the by effectively acting on the flexible section 25 divided spring force of the pressure element 28.
  • the restoring force of the coupler 3 results from the pressure in the expansion chamber 21 multiplied by the effectively to the actuator 2 out directed surface, which is pressurized by the hydraulic medium is charged.
  • the invention is not limited to those shown Embodiments limited and z. B. also for internal opening fuel injectors are used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20040105054 2003-12-15 2004-10-14 Injecteur de carburant Expired - Fee Related EP1544454B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003158723 DE10358723A1 (de) 2003-12-15 2003-12-15 Brennstoffeinspritzventil
DE10358723 2003-12-15

Publications (2)

Publication Number Publication Date
EP1544454A1 true EP1544454A1 (fr) 2005-06-22
EP1544454B1 EP1544454B1 (fr) 2007-01-24

Family

ID=34485387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040105054 Expired - Fee Related EP1544454B1 (fr) 2003-12-15 2004-10-14 Injecteur de carburant

Country Status (2)

Country Link
EP (1) EP1544454B1 (fr)
DE (2) DE10358723A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009059862A1 (fr) * 2007-11-09 2009-05-14 Robert Bosch Gmbh Module d'actionnement piézo-électrique
WO2011045298A1 (fr) * 2009-10-12 2011-04-21 Ulrich Stieler Kunststoff Service E.K. Injecteur de fluide

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4858439A (en) * 1987-03-03 1989-08-22 Toyota Jidosha Kabushiki Kaisha Device for varying a stroke
DE4306072A1 (de) * 1993-02-26 1994-09-08 Siemens Ag Vorrichtung zum Öffnen und Verschließen einer in einem Gehäuse vorhandenen Durchtrittsöffnung
DE19708304A1 (de) * 1997-02-28 1998-09-10 Siemens Ag Vorrichtung zur Übertragung einer Bewegung und Einspritzventil mit einer Vorrichtung zur Übertragung einer Bewegung
WO2001029403A1 (fr) * 1999-10-21 2001-04-26 Robert Bosch Gmbh Soupape d'injection de carburant
EP1111230A2 (fr) * 1999-12-22 2001-06-27 Siemens Aktiengesellschaft Dispositif hydraulique pour transmettre le mouvement d'un actuateur

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19940054C2 (de) * 1999-08-24 2003-11-27 Siemens Ag Dosierventil für ein unter Druck stehendes Fluid
DE19959704A1 (de) * 1999-12-10 2001-06-21 Tenovis Gmbh & Co Kg Verfahren zur Verarbeitung von Datenpaketen
DE10162045B4 (de) * 2001-12-17 2005-06-23 Siemens Ag Vorrichtung zum Übersetzen einer Auslenkung eines Aktors, insbesondere für ein Einspritzventil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4858439A (en) * 1987-03-03 1989-08-22 Toyota Jidosha Kabushiki Kaisha Device for varying a stroke
DE4306072A1 (de) * 1993-02-26 1994-09-08 Siemens Ag Vorrichtung zum Öffnen und Verschließen einer in einem Gehäuse vorhandenen Durchtrittsöffnung
DE19708304A1 (de) * 1997-02-28 1998-09-10 Siemens Ag Vorrichtung zur Übertragung einer Bewegung und Einspritzventil mit einer Vorrichtung zur Übertragung einer Bewegung
WO2001029403A1 (fr) * 1999-10-21 2001-04-26 Robert Bosch Gmbh Soupape d'injection de carburant
EP1111230A2 (fr) * 1999-12-22 2001-06-27 Siemens Aktiengesellschaft Dispositif hydraulique pour transmettre le mouvement d'un actuateur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009059862A1 (fr) * 2007-11-09 2009-05-14 Robert Bosch Gmbh Module d'actionnement piézo-électrique
WO2011045298A1 (fr) * 2009-10-12 2011-04-21 Ulrich Stieler Kunststoff Service E.K. Injecteur de fluide

Also Published As

Publication number Publication date
EP1544454B1 (fr) 2007-01-24
DE502004002759D1 (de) 2007-03-15
DE10358723A1 (de) 2005-07-07

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