EP1546542B1 - Soupape d'injection pour l'injection de carburant dans un moteur a combustion interne - Google Patents

Soupape d'injection pour l'injection de carburant dans un moteur a combustion interne Download PDF

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Publication number
EP1546542B1
EP1546542B1 EP04787097A EP04787097A EP1546542B1 EP 1546542 B1 EP1546542 B1 EP 1546542B1 EP 04787097 A EP04787097 A EP 04787097A EP 04787097 A EP04787097 A EP 04787097A EP 1546542 B1 EP1546542 B1 EP 1546542B1
Authority
EP
European Patent Office
Prior art keywords
actuator
injection valve
play compensation
compensation element
injection
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.)
Not-in-force
Application number
EP04787097A
Other languages
German (de)
English (en)
Other versions
EP1546542A1 (fr
Inventor
Willibald SCHÜRZ
Martin Simmet
Joachim Wagner
Hanspeter Zink
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP1546542A1 publication Critical patent/EP1546542A1/fr
Application granted granted Critical
Publication of EP1546542B1 publication Critical patent/EP1546542B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/26—Fuel-injection apparatus with elastically deformable elements other than coil springs

Definitions

  • the invention relates to an injection valve for the injection of fuel into an internal combustion engine.
  • injection systems For the fuel supply of internal combustion engines are increasingly used storage injection systems, which operate at very high injection pressures.
  • Such injection systems are known as common-rail systems (for diesel engines) and HPDI injection systems (for gasoline engines).
  • the fuel is conveyed by means of a high-pressure pump into an accumulator common to all cylinders of the engine, from which fuel is supplied to the injection valves on the individual cylinders.
  • the opening and closing of the injectors is controlled electromagnetically in the rule.
  • the injection valves in such systems are equipped with switchable actuators, in particular piezoelectric actuators, which control the opening and closing of the nozzle needle of the injection valve, that is, in particular, set the start and end of the injection process in time.
  • the object of the invention is to provide an injection valve whose actuator has only a small mass to be moved in the case of a small number of contact surfaces.
  • the hydraulic lash adjuster according to the invention By forming the hydraulic lash adjuster according to the invention as a component of the actuator, it is possible to reduce the mass to be moved by the actuator in a simple manner by a measure and to reduce the number of contact surfaces. Both measures have a favorable effect on the dynamics of the overall system.
  • the Figure 1 shows an actuator 1 of an injection valve, which consists essentially of a piezoelectric element 2, a so-called piezo stack, the piezoelectric element 2 at least partially coaxially surrounding, designed as a tubular spring spring element 3 and a top plate 4 and a bottom plate 5.
  • the actuator 1 serves to displace a nozzle needle 7 which is axially movably mounted in a bore of a nozzle body of the injection valve and biased in the closing direction by a spring element 6 between a injection bore at the front end of the bore and a position closing this injection bore.
  • the piezoelectric element 2 As soon as the piezoelectric element 2 is electrically excited, it expands. The energization of the piezoelectric element 2 thus causes an extension of the entire assembly of the actuator 1, so that the actuator 1 presses on its bottom plate 5 down to the mounted on a collar 7a of the nozzle needle 7 spring element 6, which in turn the nozzle needle 7 from its closed position is pressed and releases an injection hole.
  • a cooperating with the actuator 1 hydraulic clearance compensation 8 is provided.
  • the illustrated actuator 1 is characterized in that the hydraulic clearance compensation 8 is formed as a component of the actuator 1, namely as a bottom plate. 5
  • This embodiment has the advantage that on the one hand, the number of accurately manufactured to be manufactured contact surfaces is reduced and on the other hand by dispensing with a massive bottom plate 5, as is known in the prior art, the moving mass of the components can be significantly reduced, which has an advantageous effect on the dynamic behavior of the overall system.
  • the actuator 1 in addition to between the piezoelectric element 2 and the bottom plate 5 forming hydraulic lash adjuster 8 arranged intermediate plate 9, which serves to compensate for misalignment and a precise contact between the piezoelectric element 2 and the hydraulic lash adjuster 8 to ensure.
  • the intermediate plate 9 In order to align the intermediate plate 9 on the one hand and the hydraulic lash adjuster 8 on the other optimal to each other and to ensure the best possible power transmission, the abutting contact surfaces 8a and 9a of the hydraulic lash adjuster 8 and the intermediate plate 9 are correspondingly arched, as Figure 2 can be seen.
  • the top plate 4 and the spring element 3 are connected to each other via welds 10. Subsequently, the piezoelectric element 2 is inserted into the spring element 3 designed as a tubular spring until it bears directly against the top plate 4. At the bottom of the piezoelectric element 2, the now only a small mass having intermediate plate 9 is placed under the piezoelectric stack and then the hydraulic clearance compensation 8 mounted.

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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 d'injection pour l'injection de carburant dans un moteur à combustion interne. Selon l'invention, pour qu'il soit garanti que l'actionneur (1) ne présente, tout en ayant peu de surfaces de contact, qu'une faible masse à déplacer, il est proposé que l'élément de compensation de jeu (8) soit un composant de l'actionneur (1).

Claims (5)

  1. Injecteur pour l'injection de carburant dans un moteur à combustion interne, comportant au moins une aiguille d'injecteur (7) montée mobile axialement dans un boîtier d'injecteur, sur laquelle, pour commander l'injection de carburant, un actionneur (1) agit de telle façon que l'aiguille d'injecteur (7), au moins au nombre d'une, ouvre ou ferme des alésages d'injection en fonction du stade de fonctionnement de l'actionneur (1), l'actionneur (1) coopérant avec un compensateur hydraulique de jeu (8),
    le compensateur hydraulique de jeu (8) étant réalisé sous la forme d'un composant de l'actionneur (1),
    l'actionneur (1) étant constitué d'un élément piézo-électrique (2), d'un élément formant ressort (3), ainsi que d'une plaque de tête (4) et d'une plaque de fond (5), le compensateur hydraulique de jeu (8) formant la plaque de fond (5) de l'actionneur (1),
    l'élément de ressort (3) étant disposé, avec précontrainte, entre la plaque de tête (4) et le compensateur hydraulique de jeu (8).
  2. Injecteur suivant la revendication 1, caractérisé en ce que le compensateur hydraulique de jeu (8) et l'élément de ressort (3) sont reliés entre eux par une liaison faisant intervenir une matière.
  3. Injecteur suivant la revendication 1 ou 2, caractérisé en ce qu'entre l'élément piézo-électrique (2) et le compensateur hydraulique de jeu (8), est disposée une plaque intercalaire (9).
  4. Injecteur suivant la revendication 3, caractérisé en ce que les surfaces de contact (9a, 8a) de la plaque intercalaire (9), d'un côté, et celles du compensateur hydraulique de jeu (8), de l'autre côté, sont réalisées avec un bombé correspondant l'une à l'autre.
  5. Injecteur suivant la revendication 4, caractérisé en ce que les surfaces de contact sont disposées de façon à correspondre l'une à l'autre et en ce que le compensateur hydraulique de jeu (8) présente un bombé, de préférence convexe.
EP04787097A 2003-09-08 2004-09-03 Soupape d'injection pour l'injection de carburant dans un moteur a combustion interne Not-in-force EP1546542B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10341338 2003-09-08
DE10341338 2003-09-08
PCT/EP2004/052030 WO2005024223A1 (fr) 2003-09-08 2004-09-03 Soupape d'injection pour l'injection de carburant dans un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1546542A1 EP1546542A1 (fr) 2005-06-29
EP1546542B1 true EP1546542B1 (fr) 2007-01-24

Family

ID=34258486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04787097A Not-in-force EP1546542B1 (fr) 2003-09-08 2004-09-03 Soupape d'injection pour l'injection de carburant dans un moteur a combustion interne

Country Status (3)

Country Link
EP (1) EP1546542B1 (fr)
DE (1) DE502004002760D1 (fr)
WO (1) WO2005024223A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170167457A1 (en) * 2014-02-07 2017-06-15 Ecomotors, Inc. Preloaded spring for use with a piezoelectric fuel injector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE19727992C2 (de) * 1997-07-01 1999-05-20 Siemens Ag Ausgleichselement zur Kompensation temperaturbedingter Längenänderungen von elektromechanischen Stellsystemen
DE19939133A1 (de) * 1999-08-18 2001-02-22 Bosch Gmbh Robert Brennstoffeinspritzventil
DE10151688A1 (de) * 2001-10-19 2003-04-30 Bosch Gmbh Robert Ventil zum Steuern von Flüssigkeiten
DE10310297A1 (de) * 2003-03-10 2004-09-23 Robert Bosch Gmbh Brennstoffeinspritzventil

Also Published As

Publication number Publication date
DE502004002760D1 (de) 2007-03-15
WO2005024223A1 (fr) 2005-03-17
EP1546542A1 (fr) 2005-06-29

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