EP1149237B1 - Soupape d'injection de carburant - Google Patents

Soupape d'injection de carburant Download PDF

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Publication number
EP1149237B1
EP1149237B1 EP00984851A EP00984851A EP1149237B1 EP 1149237 B1 EP1149237 B1 EP 1149237B1 EP 00984851 A EP00984851 A EP 00984851A EP 00984851 A EP00984851 A EP 00984851A EP 1149237 B1 EP1149237 B1 EP 1149237B1
Authority
EP
European Patent Office
Prior art keywords
fuel injection
piston
lifting
injection valve
actuator
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
EP1149237B2 (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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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7926430&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1149237(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1149237A1 publication Critical patent/EP1149237A1/fr
Publication of EP1149237B1 publication Critical patent/EP1149237B1/fr
Application granted granted Critical
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 is based on a fuel injector according to the genus of the main claim.
  • a fuel injector according to the preamble of claim 1 is from known from DE 43 06 072 A1 and from DE 195 00 706 A1.
  • the fuel injector described in DE 43 06 072 A1 has a hydraulic lifting device opposite a valve chamber is hermetically sealed and at least one in the axial direction has flexible section.
  • the device described in DE 195 00 706 A1 Dosing liquids and gases, especially in Has fuel injectors in internal combustion engines a hydraulic displacement amplifier to implement the Travel of a piezoelectric actuator in one increased stroke of a valve needle.
  • the valve housing is the reciprocating piston of the displacement amplifier with a end section reduced in diameter provided in a recess in the working piston of the displacement amplifier protrudes.
  • One in the delimited by the pistons Disc spring inserted in the amplifier chamber lays the Working pistons on the actuator and one in the recess arranged concentrically to the end section Helical compression spring presses the reciprocating piston against the Valve needle.
  • Fuel injector has an actuator, which is guided in the valve housing under spring preload and with one of an actuator and a head part existing actuator interacts, the The headboard rests on the piezo actuator and the Actuator body an inner recess of the actuator be upheld.
  • the actuator body stands with one Valve needle in operative connection. When the Actuator becomes the valve needle against the spray direction actuated.
  • the actuator and the actuating body have at least approximately the same length and are in ceramic material or in terms of thermal expansion ceramic-like material. By the same Lengths and coefficients of thermal expansion of the used Materials, e.g. B. INVAR, it is achieved that the actuator and the actuating body evenly by the action of heat expand.
  • the main disadvantage of this arrangement is that limited usability in systems which large Are subject to temperature fluctuations.
  • the from DE 197 02 066 C2 known arrangement is due to the nonlinear behavior of the Thermal expansion coefficient of piezoceramics over does not do justice to the temperature profile of the task.
  • Another disadvantage is the high manufacturing effort, which is associated with relatively high costs, in particular due to the choice of materials (e.g. INVAR).
  • the fuel injector according to the invention with the has characteristic features of the main claim the advantage that the temperature compensation regardless of the coefficient of thermal expansion of the Piezoceramic is.
  • the thermal expansion is over a hermetically sealed lifting device compensated. Thereby will work safely and precisely Fuel injector guaranteed.
  • the lifting device can, if necessary in one unit with the valve needle, prefabricated as an independent unit and before Insert into the fuel injector with a suitable hydraulic medium.
  • the flexible sections are made of corrugated pipes easy to manufacture and therefore inexpensive.
  • the corrugated pipes are also favorable for the compensation volumes, as a temperature-related expansion of the hydraulic medium through the Flexibility of the corrugated pipes is balanced.
  • the reciprocating pistons are guided one inside the other or in a fixed position Section of the housing of the lifting device without protrusions ensures a low tendency to tilt and thus for trouble-free operation even at high Actuation speeds.
  • Fuel injector 1 shows an axial sectional view Embodiment of an inventive Fuel injector 1. This is a inward opening fuel injector 1.
  • the Fuel injection valve 1 is used in particular for direct Injecting fuel into the combustion chamber of a mixture-compressing, spark-ignited internal combustion engine.
  • An actuator 2 which is preferably disc-shaped piezoelectric or magnetostrictive elements 3 is built in two parts Actuator housing 4 arranged.
  • the actuator 2 is on a first End face 5 of a first having a cover part Actuator housing part 4a surrounded in a sleeve shape and lies with a second end face 6 on an actuator flange 7.
  • a Preload spring 8 lies with a first end 9 on the Actuator flange 7 and is of a second actuator housing part 4b surrounded in a sleeve shape, on which the second end 10 the bias spring 8 is supported.
  • the two actuator housing parts 4a and 4b are e.g. B. welded together.
  • the second Actuator housing part 4b is fixed to a valve housing 13 connected, e.g. B. welded.
  • the actuator flange 7 settles in an actuator piston 11 which is supported by the biasing spring 8 is surrounded.
  • a recess 12 is in the second actuator housing part 4b provided, through which the actuator piston 11 projects.
  • the actuator piston 11 and the second actuator housing part 4b are located on one hermetically against a valve interior 41 completed lifting device 14, which with a Hydraulic medium is filled.
  • a housing 15 of the Lifting device 14 consists of a fixed section 42, that between a first flexible section 16 and one second flexible section 17 is arranged.
  • the stationary Section 42 is preferably on a weld 18 am Valve housing 13 fixed.
  • the first flexible section 16 surrounds a first Reciprocating piston 21 and is designed as a first corrugated tube 22.
  • the first corrugated pipe 22 is on the spray side with the fixed one Section 42 and at its other end with the first Reciprocating piston 21 welded.
  • the second flexible section 17 surrounds a second piston 23, is a second Corrugated tube 24 formed and with a flange 19 one Valve needle 20 welded.
  • the second corrugated tube 24 is also welded to the fixed section 42.
  • the first piston 21 is in the present Embodiment executed in two parts and consists of an intermediate piece 25, which rests on the actuator piston 11 and communicates with the first corrugated tube 22, and a tubular piston 26 which also in the tubular stationary section 42 is guided.
  • the second piston 23 passes through a recess 27 in spray-side end of the fixed portion 42 and is guided in the piston 26.
  • the second piston 23 is with the widened end of the valve needle 20 to the flange 19 connected. In the exemplary embodiment, this is on the flange 19 second corrugated tube 24 attached.
  • the reciprocating pistons 21 and 23 are in opposite directions and are activated by a closing spring 28 pushed apart within the piston 26, causing the Fuel injector 1 remains closed.
  • the first corrugated tube 22 encloses a first compensation space 29; the second corrugated tube 24 encloses a second one Compensation room 30.
  • Compensation rooms 29 and 30 are over a bore 31a in the intermediate piece 25 and a bore 31b in second piston 23 and via a central recess 32 connected with each other. The hydraulic medium can thus compensate freely in the lifting device 14.
  • a valve closing body 33 is on the valve needle 20 formed the one with a valve seat surface 34 Sealing seat interacts.
  • a valve seat body 35 the here is made in one piece with the valve housing 13 at least one spray opening 36 is formed.
  • the Fuel is supplied to the side in the valve housing 13 trained fuel supply 37 fed and via a Gap 38 between the valve needle 20 and the Valve housing 13 led to the sealing seat.
  • the piezoelectric actuator 2 does not have a shown electronic control unit and one An electrical excitation voltage is supplied to the plug contact, the disk-shaped piezoelectric elements expand 3 of the actuator 2 against the bias of the biasing spring 8 and move the actuator flange 7 together with the Actuator piston 11 in the spray direction.
  • the hub is about that Intermediate piece 25 and the piston 26 on the Transfer volume 39 passed on.
  • the hydraulic medium is moved by the piston 26 in the spray direction displaces and presses the second piston 23 against the Spring tension of the closing spring 28 in the direction of the actuator 2 takes the second reciprocating piston 23 which is welded to it Valve needle 20 with, whereby the valve closing body 33 of the valve seat surface 34 lifts and fuel through the Spray opening 36 is sprayed in the valve seat body 35.
  • the Transmission volume 39 included hydraulic medium none Possibility to avoid and behave through the leakage gap 40 therefore become incompressible; the impulse is transmitted.
  • the fuel injector 1 heats up by external Temperature influences, power loss or Charge shifts in actuator 2 are running Change in length of the actuator 2, however, slowly. Emotional the piston 26 in the stationary housing 15 slowly in Spray direction, hydraulic fluid through the leakage gap 40 displaced from the transmission volume 39, and it will no pulse transmitted to the second piston 23. This remains at rest and the fuel injector 1 remains in the closed position.
  • the invention is not based on the illustrated Embodiment limited, but also in one Variety of other fuel injector designs 1, especially in the case of outward opening Fuel injection valves 1, realizable.

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 (11)

  1. Soupape d'injection de carburant (1) notamment injecteur pour l'installation d'injection de carburant d'un moteur à combustion interne comprenant un actionneur piézo-électrique ou magnétostrictif (2) et un organe d'obturation de soupape (33) actionné par l'actionneur (2) à l'aide d'une aiguille d'injecteur (20), cet organe coopérant avec une surface formant siège de soupape (34) pour former un siège étanche ainsi qu'un dispositif de levée hydraulique (14) ayant un premier piston de levée (21) et un second piston de levée (23),
    caractérisée en ce que
    le dispositif de levée (14) forme un ensemble hermétiquement fermé par rapport à l'intérieur (41) de l'injecteur et un boítier (15) du dispositif de levée (14) comporte au moins un segment (16, 17) souple dans la direction axiale.
  2. Soupape d'injection de carburant selon la revendication 1,
    caractérisée en ce que
    le boítier (15) du dispositif de levée (14) comprend un segment (42) fixe, relié au boítier d'injecteur (13), un premier segment souple (16) et un second segment souple (17),
    le premier segment souple (16) étant relié au segment fixe (42) et au premier piston de levée (21) et le second segment souple (17) étant relié au segment fixe (42) et au second piston de levée (23) ou à l'aiguille d'injecteur (20) actionnée par le second piston de levée (23).
  3. Soupape d'injection de carburant selon la revendication 2,
    caractérisée en ce que
    le premier segment souple (16) est constitué par un premier tube ondulé (22) et le second segment souple (17) est constitué par un second tube ondulé (24).
  4. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que
    les deux pistons de levée (21, 23) mobiles l'un par rapport à l'autre de l'installation de levée (14) sont encapsulés dans le boítier (15) de l'installation de levée (14).
  5. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    le premier piston de levée (21) coopère par un premier piston d'actionnement (11) avec l'actionneur (2) suivant une liaison active.
  6. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 5,
    caractérisée en ce que
    le second piston de levée (23) coopère par une bride (19) avec l'aiguille d'injecteur (20).
  7. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 6,
    caractérisée par
    un ressort d'obturation (28) tendu entre le premier piston de levé (21) et le second piston de levée (23).
  8. Soupape d'injection de carburant selon l'une quelconque des revendications 1 à 7,
    caractérisée en ce que
    le premier piston de levée (21), le second piston de levée (23) et un premier segment fixe (42) de l'installation de levée (14) englobent un volume de transmission (39) rempli de milieu hydraulique.
  9. Soupape d'injection de carburant selon la revendication 8,
    caractérisée par
    un intervalle de fuite (40) entre le boítier (15) du dispositif de levée (14) et le premier piston de levée (21) et/ou le second piston de levée (23), cet intervalle permettant la compensation du milieu hydraulique.
  10. Soupape d'injection de carburant selon l'une quelconque des revendications 2 à 9,
    caractérisée en ce que
    le second segment souple (16) et le premier piston de levée (21) englobent un premier volume de compensation (29) et le second segment souple (17) et le second piston de levée (23) entourent un second volume de compensation (30).
  11. Soupape d'injection de carburant selon la revendication 10,
    caractérisée en ce que
    le premier volume de compensation (29) et le second volume de compensation (30) communiquent par des perçages (3 la, 31b) réalisés dans les pistons de levée (21, 23).
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 true EP1149237B1 (fr) 2003-09-17
EP1149237B2 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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DE19709795A1 (de) * 1997-03-10 1998-09-17 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE19744235A1 (de) 1997-10-07 1999-04-08 Fev Motorentech Gmbh & Co Kg Einspritzdüse mit piezoelektrischem Aktuator
DE19838862A1 (de) * 1998-08-26 2000-03-09 Siemens Ag Dosiervorrichtung
US6079641A (en) * 1998-10-13 2000-06-27 Caterpillar Inc. Fuel injector with rate shaping control through piezoelectric nozzle lift

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CZ20012269A3 (cs) 2002-06-12
DE50003719D1 (de) 2003-10-23
JP4588956B2 (ja) 2010-12-01
DE19950760A1 (de) 2001-04-26
EP1149237A1 (fr) 2001-10-31
JP2003512558A (ja) 2003-04-02
CZ295457B6 (cs) 2005-08-17
CN1327507A (zh) 2001-12-19
EP1149237B2 (fr) 2009-03-25
CN1175179C (zh) 2004-11-10
WO2001029403A1 (fr) 2001-04-26
US6685105B1 (en) 2004-02-03

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