EP1780405A1 - Einspritzventil, Ausgleichsvorrichtung für dasselbe und Druckübertragungsvorrichtung für die Ausgleichsvorrichtung - Google Patents

Einspritzventil, Ausgleichsvorrichtung für dasselbe und Druckübertragungsvorrichtung für die Ausgleichsvorrichtung Download PDF

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Publication number
EP1780405A1
EP1780405A1 EP05023444A EP05023444A EP1780405A1 EP 1780405 A1 EP1780405 A1 EP 1780405A1 EP 05023444 A EP05023444 A EP 05023444A EP 05023444 A EP05023444 A EP 05023444A EP 1780405 A1 EP1780405 A1 EP 1780405A1
Authority
EP
European Patent Office
Prior art keywords
stamp
pressure
injector
transferring
compensation device
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
EP05023444A
Other languages
English (en)
French (fr)
Other versions
EP1780405B1 (de
Inventor
Antonio Dr. Bondi
Marco Pulejo
Raffaele Squarcini
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.)
Continental Automotive GmbH
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
Priority to EP20050023444 priority Critical patent/EP1780405B1/de
Priority to DE200560009840 priority patent/DE602005009840D1/de
Publication of EP1780405A1 publication Critical patent/EP1780405A1/de
Application granted granted Critical
Publication of EP1780405B1 publication Critical patent/EP1780405B1/de
Expired - Fee Related 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
    • 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

Definitions

  • the invention relates to a pressure transferring device comprising a stamp and a sealed fluid chamber which is bordered by a first membrane at one side of the fluid chamber.
  • the invention further relates to a compensation device for an injector comprising the pressure transferring device and to an injector comprising the compensation device.
  • DE 103 44 061 A1 discloses an injector with a hydraulic compensation device.
  • the compensation device comprises a hydraulically sealed system which comprises a piston.
  • the piston separates the hydraulically sealed system in a first volume and a second volume.
  • the slowly increasing pressure difference between the first volume and the second volume can be compensated by a fluid flow from the first volume to the second volume or vice-versa.
  • the object of the invention is to create a pressure transferring device for a compensation device for an injector which enables a uniformly distributed pressure on a first membrane bordering a fluid chamber of the pressure transferring device.
  • the invention is distinguished respectively a first aspect of the invention by a pressure transferring device.
  • the pressure transferring device comprises a stamp and a sealed fluid chamber.
  • the sealed fluid chamber is bordered by a first membrane at one side of the fluid chamber.
  • a transferring element is fixed to the stamp at one axial end of the stamp couples the stamp with the first membrane of the fluid chamber.
  • the transferring element comprises a material which comprises a smaller Young's modulus of elasticity than the material of the first membrane.
  • the stamp acts on the transferring element towards the first membrane, the first membrane and the transferring element deform. Because of the smaller Young's modulus of elasticity of the transferring element, the deformation of the transferring element adjusts at the deformation of the membrane. This contributes to a uniformly distributed pressure on the first membrane bordering the fluid chamber.
  • the transferring element and the stamp comprise an overlapping area.
  • the transferring element is coupled to the stamp in a central area of the overlapping area.
  • the pressure transferring device comprises a gap between the stamp and the transferring element outside of the central area. The gap enables the bending of the transferring element and contributes to a very good uniform distribution of the pressure.
  • the pressure transferring element or the stamp comprise a dowel pin in the central area and the stamp or respectively the transferring element comprises a corresponding mortise for the dowel pin. This enables simply a precise positioning of the transferring element relative to the stamp.
  • the dowel pin is fixed into the corresponding mortise by a press fit. This enables a proper fixing of the transferring element to the stamp without gluing, welding and/or something similar.
  • the stamp comprises a first axial section and a second axial section separated by a step.
  • the first axial section has a bigger diameter than the second axial section and comprises the axial end of the stamp facing towards the transferring element.
  • This enables to use the step as a seat for a spring.
  • the pressure transferring device being a part of a compensation device for an injector which comprises a compensation device spring.
  • the step then may form the seat for the compensation device spring and the second axial section may be used to center the compensation device spring in addition to the use of the stamp for fixing and positioning of the transferring element and transferring pressure on the transferring element.
  • the compensation device spring may contribute to a proper compensation of changes in the axial length of the injector by thermal expansion of the injector.
  • the transferring element comprises a synthetic material and the first membrane comprises a metal.
  • the synthetic material may enable a cheap production of the transferring element. If the first membrane comprises the metal and the stamp comprises the synthetic material, this may contribute to an avoiding of a loss of the first membrane by rust and oxidation of the membrane.
  • the pressure transferring device comprises Teflon and/or Nylon. This enables a small Young's modulus of elasticity of the transferring element while the transferring element being very stable and robust.
  • the first membrane comprises steel and/or aluminum. This enables a robust and flexible first membrane.
  • the invention is distinguished respectively a second aspect of the invention by the compensation device which comprises the pressure transferring device.
  • the compensation device further comprises a first volume of the fluid chamber and a second volume of the fluid chamber.
  • the first volume is hydraulically coupled with the second volume, at least in a given state of the compensation device.
  • a piston is arranged in the fluid chamber, movable in axial direction. The piston borders at least one of the volumes in axial direction.
  • a proper hydraulic coupling of the volumes enables the compensation of a slowly changing pressure on the stamp or the piston by a movement of the piston changing the capacity of the first and/or respectively the second volume. It further enables the transferring of a fast changing pressure from the stamp to the piston or vice-versa.
  • a throttle, and/or a fluid path with a valve and/or a check valve, and/or a clearance fit of the piston to the fluid chamber may contribute to the proper hydraulic coupling.
  • the given state may comprise a position of the valve and/or respectively the check valve.
  • the invention is distinguished related to a third aspect of the invention by a first injector which comprises the compensation device.
  • the first injector comprises an injector body having an injector body recess in which the compensation device is arranged.
  • An actor is coupled to the piston of the compensation device at a first axial and of the actor.
  • a needle body is coupled to the actor at the second axial end of the actor facing away from the piston.
  • the needle body prevents a fluid flow through an injection nozzle of the injector body in a closing position of the needle body and otherwise enables the fluid flow.
  • the compensation device enables the compensation of a thermal expansion of the injector body and so enables a good contact of the actor and the needle body. This contributes to a precise dosing of the fluid by the first injector.
  • the invention is distinguished related to a fourth aspect of the invention by a second injector which comprises the compensation device.
  • the needle body is coupled to the actor via the compensation device.
  • a pressure transferring device ( Figure 1) comprises a fluid chamber 2 which is sealed by a first membrane 4.
  • the pressure transferring device further comprises a stamp 6 which is coupled to the first membrane 4 by a transferring element 8.
  • the stamp 6 and the transferring element 8 comprise an overlapping area 10.
  • the pressure transferring device may be used for transferring a pressure from the stamp 6 to a fluid in the fluid chamber 2.
  • the pressure may act on the stamp 6 towards the transferring element 8 on a side of the stamp 6 facing away from the transferring element 8.
  • the pressure of the fluid in the fluid chamber 2 may be used for further devices.
  • the further devices may comprise a compensation device 30 ( Figure 6).
  • the compensation device 30 may be used for compensating a change of an axial length of an injector 20 ( Figure 5) because of a thermal expansion of the injector 20.
  • the Young's modulus of elasticity of the transferring element 8 is smaller than the Young's modulus of elasticity of the membrane 4. Because of the smaller Young's modulus of the transferring element 8, the deformation of the transferring element 8 is bigger than the deformation of the membrane 4 under the same pressure. Under pressure this leads to an adjustment of the transferring element 8 to the first membrane 4.
  • the membrane 4 deforms ( Figure 2). Because of the smaller Young's modulus of elasticity of the transferring element 8, the deformation of the transferring element 8 adjusts at the deformation of the membrane 4.
  • the adjustment of the membrane 4 and the transferring element 8 under pressure leads to a larger contact surface of the transferring element 8 and the membrane 4 related to a transferring element 8 which comprises the same or a bigger Young's modulus of elasticity than the membrane 4.
  • the transferring element 8 comprise a synthetic material and the membrane 4 comprises a metal. If the transferring element 8 comprises the synthetic material and the membrane 4 comprises the metal, this may contribute to the avoiding of a loss of the membrane 4 by rust and oxidation.
  • the synthetic material may comprise Teflon and/or Nylon and/or the metal may comprise steel and/or aluminum. Teflon and Nylon are very robust materials while having a small Young's modulus of elasticity related to the Young's modulus of elasticity of steel and aluminum. If the transferring element 8 comprises the synthetic material and the membrane 4 comprises the metal the deformation under pressure may be much smaller than it is illustrated in Figure 2. Further the deformation of the membrane 4 may be much smaller than it is illustrated in Figure 2.
  • the transferring element 8 and the stamp 6 may be coupled only in a central area 12 of the overlapping area 10 ( Figure 3). This enables having a gap 14 outside of the central area 12 between the stamp 6 and the transferring element 8.
  • the gap 14 enables a bending of the transferring element 8 (FIG. 4).
  • the bending of the transferring element 8 under pressure may contribute to a larger contact surface between the membrane 4 and the transferring element 8 respective to the pressure transferring device without the gap 14.
  • the larger contact surface under pressure contributes to a much better distribution of the pressure on the membrane 4.
  • the properly distributed pressure on the membrane 4 contributes to a proper function of the pressure transferring device and exceeds the lifetime of the pressure transferring device and especially of the membrane 4.
  • the pressure transferring element 8 comprises a dowel pin 16 in the central area 12 and the stamp 6 comprises a corresponding mortise 18 for the dowel pin 16. If the dowel pin 16 is put into the mortise 18, the transferring element 8 is centered and properly positioned related to the stamp 6.
  • the dowel pin 16 and the mortise 18 are formed in such a way that the dowel pin 16 is fixed to the mortise 18 by a press fit.
  • the press fit enables a very simple assembling of the transferring element 8 to the stamp 6. It further enables the avoiding of gluing, welding, or something similar for fixing the transferring element 8 to the stamp 6.
  • the dowel pin 16 may be a part of the stamp 6. Then the corresponding mortise 18 is a part of the transferring element 8. In a further alternative embodiment there may be further dowel pins 16 and further corresponding mortises 18.
  • the injector 20 ( Figure 5) comprises an injector body 22 with an injector body recess 24.
  • a needle body 26, an actor 28, and a compensation device 30 are arranged in the injector body recess 24 of the injector body 22.
  • the injector 20 may be used for dosing fluid into a combustion chamber or an inlet manifold of an internal combustion engine.
  • the injector 20 is of an outward opening type. In an alternative embodiment the injector 20 may be of an inward opening type.
  • the actor 28 is a piezoelectric actuator.
  • the piezoelectric actuator may change its axial length if it gets energized in an expansion-duration of some microseconds.
  • the needle body 26 prevents a fluid flow through an injection nozzle 27 in the injector body 22 in a closing position of the needle body 26. Outside of the closing position of the needle body 26, the needle body 26 enables the fluid flow through the injection nozzle 27.By changing its length the actor 28 may force the needle body 26 out of the closing position of the needle body 26. Outside of the closing position of the needle body 26 there is a gap between the injector body 22 and the needle body 26 at an axial end of the injector 20 facing away from the compensation device 30, the gap forming the injection nozzle 27.
  • a needle body spring 34 forces the needle body 26 via a needle plate 36 towards the actor 28. So, if the actor 28 is de-energized the actor 28 shortens its length and the needle spring 35 forces the needle body 26 in its closing position. It depends on a force balance between the force on the needle body 26 because of the actor 28 and the force on the needle body 26 because of the needle body spring 34 whether the needle body 26 is in its closing position or not.
  • the actor 28 and the injector body 22 change their axial length with the temperature. If the injector body 22 expands more or less than the actor 28 because of the temperature, without the compensation device 30 this may lead to a different position of the actor 28 relative to the injector body 22 and to a different position of the actor 28 relative to the needle body 26. This may lead to a loss of a contact between the actor 28 and the needle body 26, for example, in such a way that the actor 28 is not able to force the needle body 26 out of its closing position. So, without the compensation device 30 the different change of length of the injector body 22 and the actor 28 may contribute to a worsening of the fluid injection into the internal combustion engine.
  • the compensation device 30 may be arranged between the injector body 22 and the actor 28 to compensate the different thermal expansions of the injector body 22 and the actor 28.
  • the compensation device 30 may further compensate a different thermal expansion of the needle body 26 relative to the actor 28 and/or the injector body 22.
  • the compensation device 30 is fixed to the injector body 22 and coupled to the injector body 22 by a compensation device spring 32.
  • the stamp 6 preferably comprises a first axial section and a second axial section separated by a step 41 ( Figure 6).
  • the first axial section of the stamp 6 comprises a smaller diameter than the second axial section.
  • the step 41 preferably forms the seat for the compensation device spring 32.
  • the second axial section is preferably used to center the compensation device spring 32.
  • the compensation device 30 may comprise a first volume 42 and a second volume 44.
  • the first volume 42 may be hydraulically coupled to the second volume 44.
  • Preferably the first volume 42 is hydraulically coupled to the second volume 44 by a throttle 46.
  • a piston 48 may be arranged in a way that the second volume 44 is bordered at one side by the piston 48.
  • the compensation device comprises a second membrane 50 and a rod 52 which extends through the second membrane 50 and which is fixed to the piston 48.
  • the compensation device 30 For filling fluid into the compensation device 30 the compensation device 30 comprises a fluid inlet 54. After filling the compensation device 30 with the fluid, the compensation device 30 may be sealed with a sealing body 56. In that way the compensation device 30 is a totally closed hydraulic system.
  • the compensation device spring 32 acts on the stamp 6.
  • the stamp 6 transfers the pressure on the membrane 4 via the transferring element 8.
  • the membrane 4 deforms inwardly and presses the fluid from the first volume 42 to the second volume 44.
  • the pressure in the second volume 44 forces the piston 48 away from the first volume 42 and in the injector 20 against the actor 28. If the temperature rises, the injector body 22 expands slowly and more than the actor 28. So, the pressure from the piston 48 on the actor 28 and vice-versa decreases. This leads to a decreasing pressure in the second volume 44.
  • the decreasing pressure in the second volume 8 leads to a flow of the fluid from the first volume 42 to the second volume 44 which is still under pressure because of the compensation device spring 32.
  • a decreasing temperature of the injector 20 leads to an increasing pressure in the second volume 44 and to a fluid flow from the second volume 44 to the first volume 42. So, the piston 48, especially the rod 52 never looses the contact to the actor 28 because of the slow thermal expansion of the injector 20. So, the actor 28 does not loose its contact to the needle body 26. This contributes to a precise dosing of fluid by the injector 20.
  • the whole compensation device 30 acts nearly like a stiff body and forms a back stop for the actor 28. So the pressure is transferred nearly completely from the actor 28 to the needle body 26.
  • the compensation device 30 may be arranged between the actor 28 and the needle body 26. The actor then acts on the needle body 26 via the compensation device 30.
  • the throttle 46 may be arranged in the piston 48 and the piston 48 separates the first volume 42 from the second volume 44.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20050023444 2005-10-26 2005-10-26 Einspritzventil, Ausgleichsvorrichtung für dasselbe und Druckübertragungsvorrichtung für die Ausgleichsvorrichtung Expired - Fee Related EP1780405B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20050023444 EP1780405B1 (de) 2005-10-26 2005-10-26 Einspritzventil, Ausgleichsvorrichtung für dasselbe und Druckübertragungsvorrichtung für die Ausgleichsvorrichtung
DE200560009840 DE602005009840D1 (de) 2005-10-26 2005-10-26 Einspritzventil, Ausgleichsvorrichtung für dasselbe und Druckübertragungsvorrichtung für die Ausgleichsvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20050023444 EP1780405B1 (de) 2005-10-26 2005-10-26 Einspritzventil, Ausgleichsvorrichtung für dasselbe und Druckübertragungsvorrichtung für die Ausgleichsvorrichtung

Publications (2)

Publication Number Publication Date
EP1780405A1 true EP1780405A1 (de) 2007-05-02
EP1780405B1 EP1780405B1 (de) 2008-09-17

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Application Number Title Priority Date Filing Date
EP20050023444 Expired - Fee Related EP1780405B1 (de) 2005-10-26 2005-10-26 Einspritzventil, Ausgleichsvorrichtung für dasselbe und Druckübertragungsvorrichtung für die Ausgleichsvorrichtung

Country Status (2)

Country Link
EP (1) EP1780405B1 (de)
DE (1) DE602005009840D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013135460A1 (de) * 2012-03-16 2013-09-19 Robert Bosch Gmbh Baugruppe

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3217581A (en) * 1964-01-10 1965-11-16 Fred D Hinger Mallets for playing upon percussion instruments
GB1041000A (en) * 1964-04-09 1966-09-01 Cincinnati Milling Machine Co Closure for chamber in hydraulic forming press
US3665799A (en) * 1970-11-23 1972-05-30 Fred D Hinger Adjustable drum mallets
SU933470A1 (ru) * 1980-05-22 1982-06-07 Харьковский инженерно-строительный институт Устройство дл нанесени рисунка на гладкую поверхность штампа
SU1493354A1 (ru) * 1987-11-17 1989-07-15 Предприятие П/Я В-2453 Способ штамповки и инструмент дл его осуществлени
EP0477400A1 (de) * 1990-09-25 1992-04-01 Siemens Aktiengesellschaft Anordnung für einen in Hubrichtung wirkenden adaptiven, mechanischen Toleranzausgleich für den Wegtransformator eines piezoelektrischen Aktors
DE19942816A1 (de) * 1999-09-08 2001-03-22 Daimler Chrysler Ag Einspritzventil
DE10259730A1 (de) * 2002-12-19 2004-07-01 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10344061A1 (de) * 2003-09-23 2005-04-28 Siemens Ag Einspritzventil mit einem hydraulischen Ausgleichselement
EP1538331A1 (de) * 2003-12-03 2005-06-08 Robert Bosch Gmbh Brennstoffeinspritzventil

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3217581A (en) * 1964-01-10 1965-11-16 Fred D Hinger Mallets for playing upon percussion instruments
GB1041000A (en) * 1964-04-09 1966-09-01 Cincinnati Milling Machine Co Closure for chamber in hydraulic forming press
US3665799A (en) * 1970-11-23 1972-05-30 Fred D Hinger Adjustable drum mallets
SU933470A1 (ru) * 1980-05-22 1982-06-07 Харьковский инженерно-строительный институт Устройство дл нанесени рисунка на гладкую поверхность штампа
SU1493354A1 (ru) * 1987-11-17 1989-07-15 Предприятие П/Я В-2453 Способ штамповки и инструмент дл его осуществлени
EP0477400A1 (de) * 1990-09-25 1992-04-01 Siemens Aktiengesellschaft Anordnung für einen in Hubrichtung wirkenden adaptiven, mechanischen Toleranzausgleich für den Wegtransformator eines piezoelektrischen Aktors
DE19942816A1 (de) * 1999-09-08 2001-03-22 Daimler Chrysler Ag Einspritzventil
DE10259730A1 (de) * 2002-12-19 2004-07-01 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10344061A1 (de) * 2003-09-23 2005-04-28 Siemens Ag Einspritzventil mit einem hydraulischen Ausgleichselement
EP1538331A1 (de) * 2003-12-03 2005-06-08 Robert Bosch Gmbh Brennstoffeinspritzventil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013135460A1 (de) * 2012-03-16 2013-09-19 Robert Bosch Gmbh Baugruppe

Also Published As

Publication number Publication date
EP1780405B1 (de) 2008-09-17
DE602005009840D1 (de) 2008-10-30

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