EP1149237B2 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1149237B2
EP1149237B2 EP00984851A EP00984851A EP1149237B2 EP 1149237 B2 EP1149237 B2 EP 1149237B2 EP 00984851 A EP00984851 A EP 00984851A EP 00984851 A EP00984851 A EP 00984851A EP 1149237 B2 EP1149237 B2 EP 1149237B2
Authority
EP
European Patent Office
Prior art keywords
piston
lifting
fuel injection
injection valve
lifting piston
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.)
Expired - Lifetime
Application number
EP00984851A
Other languages
German (de)
English (en)
Other versions
EP1149237A1 (fr
EP1149237B1 (fr
Inventor
Wolfgang Ruehle
Hubert Stier
Matthias Boee
Guenther Hohl
Norbert Keim
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
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Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1149237A1 publication Critical patent/EP1149237A1/fr
Application granted granted Critical
Publication of EP1149237B1 publication Critical patent/EP1149237B1/fr
Publication of EP1149237B2 publication Critical patent/EP1149237B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for

Definitions

  • the invention relates to a fuel injection valve according to the preamble of the main claim.
  • a fuel injection valve according to the preamble of claim 1 is known from DE 43 06 072 A1 and from the DE 195 00 706 A1 known.
  • That in the DE 43 06 072 A1 described fuel injector has a hydraulic lifting device which is hermetically sealed against a valve chamber and having at least one axially flexible portion.
  • the in the DE 195 00 706 A1 described device for dosing liquids and gases in particular in fuel injection valves in internal combustion engines, has a hydraulic displacement amplifier for converting the travel of a piezoelectric actuator into an enlarged stroke of a valve needle.
  • a hydraulic displacement amplifier for converting the travel of a piezoelectric actuator into an enlarged stroke of a valve needle.
  • For construction volume-small spatial integration of the repeater in the valve housing of the reciprocating piston of the repeater is provided with a reduced diameter end portion which projects into a recess in the working piston of the repeater.
  • An in the limited of the piston booster chamber diaphragm spring applies the working piston to the actuator and a concentric with the end portion arranged in the recess helical compression spring pushes the piston against the valve needle.
  • a disadvantage of the DE 195 00 706 A1 known lifting device is mainly the complex construction and the length of the valve. Due to the large displacement volumes also prevails a high tendency to cavitation in the throttle gaps.
  • a fuel injection valve is known in which the change in length of the actuator is compensated by a corresponding combination of materials.
  • the resulting from this document fuel injector has an actuator, which is guided under spring preload in the valve housing and cooperating with a consisting of an actuator body and a head part operating part, wherein the head part rests on the piezoelectric actuator and the actuator body engages through an inner recess of the actuator.
  • the actuator body is in operative connection with a valve needle. Upon actuation of the actuator, the valve needle is actuated counter to the spray direction.
  • the actuator and the actuating body have at least approximately the same length and are embodied in ceramic material or in a ceramic-like material with regard to thermal expansion. By the same lengths and thermal expansion coefficients of the materials used, for. B. INVAR, it is achieved that extend the actuator and the actuator body by heat uniformly.
  • a disadvantage of this arrangement is mainly the limited usability in systems that are subject to large temperature fluctuations.
  • the from the DE 197 02 066 C2 Known arrangement is not justified due to the non-linear behavior of the thermal expansion coefficient of piezoceramics on the temperature profile of the task.
  • a disadvantage is also the high production costs, which is associated with relatively high costs, which are in particular due to the choice of materials (eg INVAR).
  • the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that the temperature compensation is independent of the thermal expansion coefficient of the piezoceramic.
  • the thermal expansion is compensated by a hermetically closed lifting device. This ensures a safe and precise operation of the fuel injection valve.
  • the lifting device can be optionally prefabricated in a unit with the valve needle, as an independent unit and filled with a suitable hydraulic medium before insertion into the fuel injection valve.
  • corrugated pipes are easy to manufacture and therefore cost.
  • the corrugated pipes are also favorable for the compensation volumes, since a temperature-induced expansion of the hydraulic medium is compensated by the flexibility of the corrugated pipes.
  • Fig. 1 This is an inwardly opening fuel injector 1.
  • the fuel injector 1 is used in particular for the direct injection of fuel into the combustion chamber of a mixture-compressing spark-ignition internal combustion engine.
  • An actuator 2 which is preferably constructed of disk-shaped piezoelectric or magnetostrictive elements 3, is arranged in a two-part actuator housing 4.
  • the actuator 2 is surrounded in a sleeve-shaped manner at a first end face 5 by a first actuator housing part 4a having a cover part and is in contact with an actuator flange 7 with a second end face 6.
  • a biasing spring 8 rests with a first end 9 on the Aktorflansch 7 and is surrounded by a second actuator housing part 4b sleeve-shaped, on which the second end 10 of the biasing spring 8 is supported.
  • the two Aktorgekorusemaschine 4a and 4b are z. B. welded together.
  • the second actuator housing part 4b is fixedly connected to a valve housing 13, for. B. welded.
  • the Aktorflansch 7 continues in an actuator piston 11, which is surrounded by the biasing spring 8.
  • a recess 12 is provided, through which the actuator piston 11 protrudes.
  • the actuator piston 11 and the second actuator housing part 4b abut against a hermetically sealed to a valve interior 41 lifting device 14, which is filled with a hydraulic medium.
  • a housing 15 of the lifting device 14 consists of a stationary portion 42 which is disposed between a first flexible portion 16 and a second flexible portion 17.
  • the stationary section 42 is preferably fixed to the valve housing 13 via a weld 18.
  • the first flexible portion 16 surrounds a first reciprocating piston 21 and is formed as a first corrugated tube 22.
  • the first corrugated tube 22 is spray-welded to the fixed portion 42 and at its other end to the first piston 21.
  • the second flexible portion 17 surrounds a second piston 23, is formed as a second corrugated tube 24 and welded to a flange 19 of a valve needle 20.
  • the second corrugated tube 24 is also welded to the fixed portion 42.
  • the first reciprocating piston 21 is made in two parts in the present embodiment and consists of an intermediate piece 25 which rests on the actuator piston 11 and is in communication with the first corrugated tube 22, and a tubular piston 26 which is guided in the likewise tubular stationary portion 42.
  • the second piston 23 passes through a recess 27 in the discharge end of the stationary portion 42 and is guided in the piston 26.
  • the second piston 23 is connected to the widened to the flange 19 end of the valve needle 20.
  • the second corrugated tube 24 is attached in the embodiment.
  • the reciprocating piston 21 and 23 are movable in opposite directions and are pushed apart by a closing spring 28 within the piston 26, whereby the fuel injection valve 1 remains closed.
  • the first corrugated tube 22 encloses a first compensation chamber 29; the second corrugated pipe 24 encloses a second compensation chamber 30.
  • the compensation chambers 29 and 30 are connected to one another via a bore 31a in the intermediate piece 25 and a bore 31b in the second piston 23 and via a central recess 32.
  • the hydraulic medium can thus compensate freely in the lifting device 14.
  • the first piston 21, the second piston 23 and the stationary portion 42 of the housing 15 enclose an annular transfer volume 39 which is filled with the hydraulic medium. It serves to transmit momentum from the actuator 2 to the valve needle 20, the stroke ratio of a small Aktorhubs to a larger valve needle and the compensation of temperature-induced expansion processes of the actuator 2 and the lifting device 14.
  • a leakage gap 40 of defined size, between the housing 15 and the piston 26 is formed, allows the outflow of hydraulic fluid from the transfer volume 39 into the compensation chambers 29 and 30 during slow, temperature-induced movements of the reciprocating piston 21 and 23rd
  • valve closing body 33 On the valve needle 20, a valve closing body 33 is formed, which cooperates with a valve seat surface 34 to a sealing seat.
  • a valve seat body 35 which is embodied here in one piece with the valve housing 13, at least one injection opening 36 is formed.
  • the fuel is supplied via a laterally formed in the valve housing 13 fuel supply 37 and passed through an intermediate space 38 between the valve needle 20 and the valve housing 13 to the sealing seat.
  • the invention is not limited to the illustrated embodiment, but also in a variety of other designs of fuel injection valves 1, in particular in the case of outwardly opening fuel injectors 1, realized.

Landscapes

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

Claims (8)

  1. Soupape d'injection de carburant (1), en particulier soupape d'injection pour des installations d'injection de carburant de moteurs à combustion interne, comprenant un actionneur piézoélectrique ou magnétostrictif (2) et un corps de fermeture de soupape (33) pouvant être actionné par l'actionneur (2) au moyen d'une aiguille de soupape (20), lequel coopère avec une surface de siège de soupape (34) pour produire un siège d'étanchéité, et comprenant un dispositif de levage hydraulique (14) avec un premier piston de levage (21) et un deuxième piston de levage (23), le dispositif de levage (14) étant une unité constructive fermée hermétiquement par rapport à un espace interne de soupape (41) et un boîtier (15) du dispositif de levage (14) présentant au moins une portion flexible dans la direction axiale (16, 17), et
    le boîtier (15)du dispositif de levage (14) présentant une portion (42) fixe, connectée à un boîtier de soupape (13), une première portion flexible (16) et une deuxième portion flexible (17), la première portion flexible (16) étant connectée fixement à la portion fixe (42) et au premier piston de levage (21) et la deuxième portion flexible (17) étant connectée fixement à la portion fixe (42) et au deuxième piston de levage (23) ou à l'aiguille de soupape (20) actionnée par le deuxième piston de levage (23),
    caractérisée en ce que
    le premier et le deuxième piston de levage (21, 23) sont guidés l'un dans l'autre et
    en ce que la première portion flexible (16) et le premier piston de levage (21) enserrent un premier volume de compensation (29) et la deuxième portion flexible (17) et le deuxième piston de levage (23) enserrent un deuxième volume de compensation (30) et le premier volume de compensation (29) et le deuxième volume de compensation (30) sont en liaison par le biais d'alésages (31a, 31b) dans les pistons de levage (21, 23).
  2. Soupape d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    la première portion flexible (16) est réalisée sous forme d'un premier tube ondulé (22) et la deuxième portion flexible (17) est réalisée sous forme d'un deuxième tube ondulé (24).
  3. Soupape d'injection de carburant selon l'une quelconque des revendications 1 ou 2,
    caractérisée en ce que
    les deux pistons de levage (21, 23) déplaçables l'un par rapport à l'autre, du dispositif de levage (14), sont encapsulés dans le boîtier (15) du dispositif de levage (14).
  4. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que
    le premier piston de levage (21) est en liaison fonctionnelle par le biais d'un piston d'actionnement (11) avec l'actionneur (2).
  5. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    le deuxième piston de levage (23) est en liaison fonctionnelle avec une bride (19) de l'aiguille de soupape (20).
  6. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 5,
    caractérisée en ce
    qu'un ressort de fermeture (28) est serré entre le premier piston de levage (21) et le deuxième piston de levage (23).
  7. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 6,
    caractérisée en ce que
    le premier piston de levage (21), le deuxième piston de levage (23) et une portion fixe (42) du dispositif de levage (14) enferment un volume de transfert (39) qui est rempli d'un fluide hydraulique.
  8. Soupape d'injection de carburant selon la revendication 7,
    caractérisée en ce
    qu'une fente de fuite (40) se trouve entre le boîtier (15) du dispositif de levage (14) et le premier piston de levage (21) et/ou le deuxième piston de levage (23), laquelle permet la compensation du fluide hydraulique.
EP00984851A 1999-10-21 2000-10-21 Soupape d'injection de carburant Expired - Lifetime EP1149237B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19950760A DE19950760A1 (de) 1999-10-21 1999-10-21 Brennstoffeinspritzventil
DE19950760 1999-10-21
PCT/DE2000/003731 WO2001029403A1 (fr) 1999-10-21 2000-10-21 Soupape d'injection de carburant

Publications (3)

Publication Number Publication Date
EP1149237A1 EP1149237A1 (fr) 2001-10-31
EP1149237B1 EP1149237B1 (fr) 2003-09-17
EP1149237B2 true EP1149237B2 (fr) 2009-03-25

Family

ID=7926430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00984851A Expired - Lifetime EP1149237B2 (fr) 1999-10-21 2000-10-21 Soupape d'injection de carburant

Country Status (7)

Country Link
US (1) US6685105B1 (fr)
EP (1) EP1149237B2 (fr)
JP (1) JP4588956B2 (fr)
CN (1) CN1175179C (fr)
CZ (1) CZ295457B6 (fr)
DE (2) DE19950760A1 (fr)
WO (1) WO2001029403A1 (fr)

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JP2003512558A (ja) 2003-04-02
WO2001029403A1 (fr) 2001-04-26
CN1175179C (zh) 2004-11-10
EP1149237A1 (fr) 2001-10-31
CZ20012269A3 (cs) 2002-06-12
CN1327507A (zh) 2001-12-19
DE50003719D1 (de) 2003-10-23
EP1149237B1 (fr) 2003-09-17
JP4588956B2 (ja) 2010-12-01
DE19950760A1 (de) 2001-04-26
US6685105B1 (en) 2004-02-03
CZ295457B6 (cs) 2005-08-17

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