EP1887216A1 - Arrangement thermique de compensation dans une valve d'injection - Google Patents

Arrangement thermique de compensation dans une valve d'injection Download PDF

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Publication number
EP1887216A1
EP1887216A1 EP06016135A EP06016135A EP1887216A1 EP 1887216 A1 EP1887216 A1 EP 1887216A1 EP 06016135 A EP06016135 A EP 06016135A EP 06016135 A EP06016135 A EP 06016135A EP 1887216 A1 EP1887216 A1 EP 1887216A1
Authority
EP
European Patent Office
Prior art keywords
piston
front surface
thermal compensation
compensation arrangement
casing
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
EP06016135A
Other languages
German (de)
English (en)
Other versions
EP1887216B1 (fr
Inventor
Emiliano Dr. Cipriani
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 DE200660011604 priority Critical patent/DE602006011604D1/de
Priority to EP20060016135 priority patent/EP1887216B1/fr
Publication of EP1887216A1 publication Critical patent/EP1887216A1/fr
Application granted granted Critical
Publication of EP1887216B1 publication Critical patent/EP1887216B1/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
    • 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
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/08—Fuel-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
    • 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
    • F02M2200/06—Fuel-injection apparatus having means for preventing coking, e.g. of fuel injector discharge orifices or valve needles
    • 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
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic

Definitions

  • the invention relates to a thermal compensation arrangement for an injection valve and an injection valve.
  • Injection valves are in wide spread use, in particular for internal combustion engines where they may be arranged in order to dose the fluid into an intake manifold of the internal combustion engine or directly into the combustion chamber of a cylinder of the internal combustion engine.
  • Injection valves for an internal combustion engine comprise actuator units.
  • the actuator unit In order to inject fuel, the actuator unit is energized so that a fluid flow through the fluid outlet portion of the injection valve is enabled.
  • the respective injection valve may be suited to dose fluids under very high pressures.
  • the pressures may be in case of a gasoline engine, for example the range of up to 200 bar or in the case of diesel engines in the range of up to 2,000 bar.
  • the injection of fluids under such high pressures has to be carried out very precisely.
  • the object of the invention is to create a thermal compensation arrangement which facilitates a reliable and precise function of the injection valve.
  • the invention is distinguished by a thermal compensation arrangement for an injection valve, the injection valve comprising a housing including a central longitudinal axis, the housing comprising a cavity, a valve needle axially movable in the cavity, and an actuator unit being coupled to the valve needle and enabling the axial movement of the valve needle relative to the housing upon actuation of the actuator unit.
  • the thermal compensation arrangement comprises a casing being coupable to the housing and comprising a recess, a piston axially movable in the recess and being coupable to the actuator unit.
  • the piston has a lateral surface, a first front surface pointing in axial direction and a second front surface pointing in axial direction and away from the first front surface.
  • the thermal compensation arrangement comprises a gap being formed in the recess and extending in radial direction between the lateral surface of the piston and the casing, a first piston channel being arranged in the piston and extending from the first front surface to the second front surface of the piston, and a second piston channel extending from the lateral surface to the first piston channel thereby enabling a fluid flow through the second piston channel between the gap and a recess section extending in axial direction between the first front surface of the piston and the casing.
  • the thermal compensation arrangement has a groove being arranged on the lateral surface of the piston and being hydraulically coupled to the second piston channel. This allows a good performance of the fluid flow from the gap into the piston channel.
  • the groove is extending circumferentially over the lateral surface of the piston.
  • the invention is distinguished by an injection valve comprising a thermal compensation arrangement.
  • An injection valve 10 (figure 1) that is used as a fuel injection valve for an internal combustion engine, comprises a housing 12, a thermal compensation arrangement 14 and an actuator unit 16.
  • the housing 12 has a tubular shape.
  • the actuator unit 16 is inserted into the housing 12 and comprises a piezo actuator, which changes its axial length depending on a control signal applied to it.
  • the actuator unit 16 may, however, also comprise another type of actuator, which is known to person skilled in the art for that purpose.
  • Such an actuator may be, for example, a solenoid.
  • the injection valve 10 comprises a valve body 20 with a central longitudinal axis A and a cavity 24 which is axially led through the valve body 20. On one of the free ends of the cavity 24, a fluid outlet portion 28 is formed which is closed or open depending on the axial position of a valve needle 22.
  • the injection valve 10 further has a fluid inlet portion 26 which is arranged in the housing 12 and which is hydraulically coupled to the cavity 24 and a not shown fuel connector.
  • the fuel connector is designed to be connected to a high pressure fuel chamber of an internal combustion engine, the fuel is stored under high pressure, for example, under the pressure above 200 bar.
  • the valve body 20 has a valve body spring rest 32 and the valve needle 22 comprises a valve needle spring rest 34, both spring rests 32, 34 supporting a main spring 30 arranged between the valve body 20 and the valve needle 22.
  • the injection valve 10 is of an outward opening type. In an alternative embodiment of the injection valve 10 may be of an inward opening type.
  • a bellow 36 is arranged which is sealingly coupling the valve body 20 with the valve needle 22. By this a fluid flow between the cavity 24 and a chamber 38 is prevented.
  • the bellow 36 is formed and arranged in a way that the valve needle 22 is actuable by the actuator unit 16.
  • Figure 2 shows a longitudinal sectional view of the thermal compensation arrangement 14 arranged in the housing 12 and coupled to the actuator unit 16.
  • the thermal compensation unit 14 has a casing 45 of a cylindrical shape which has a recess 54, in which a piston 46 is arranged which is of a cylindrical shape and extends in the axial direction of the casing 45 and is coupled to the actuator unit 16 by a connecting bar 48.
  • the thermal compensation unit 14 comprises a sealing element 50 arranged in a piston rest 51 being part of the casing 45 and supporting the piston 46 in an initial state of the thermal compensation unit 14 as described below.
  • a spring retaining element 42 is mechanically coupled to the thermal compensation unit 14 by the connecting bar 48.
  • a compensation spring 44 is arranged between the sealing element 50 of the thermal compensation unit 14 and a spring retaining element spring rest 52 of the spring retaining element 42 to support the compensation spring 44.
  • the thermal compensation arrangement 14 is rigidly coupled to the housing 12 of the injection valve 10 by a welding seam 56 extending circumferentially over a side surface 57 of the casing 45 of the thermal compensation arrangement 14.
  • Figure 3 and 4 show the thermal compensation arrangement 14 in a longitudinal sectional and in large detailed view.
  • the piston 46 of the thermal compensation arrangement 14 has a first front surface 58 pointing in axial direction away from the actuator unit 16 and a second front surface 59 pointing in axial direction and facing the actuator unit 16 thereby pointing away from the first front surface 58.
  • the cylindrical shaped piston 46 furthermore has a lateral surface 60 extending between the first front surface 58 and the second front surface 59.
  • a gap 65 is formed being a part of the recess 54 of the casing 45.
  • a recess section 66 is extending in axial direction.
  • a bottom recess section 67 is arranged between the second front surface 59 of the piston 46 and the sealing element 50 . The recess section 66 and the bottom recess section 67 are part of the recess 54 of the casing 45.
  • a first piston channel 61a is arranged in the piston 46 and extends from the first front surface 58 of the piston 46 to the second front surface 59 of the piston 46.
  • the first piston channel 61a allows a hydraulic coupling of the recess section 66 between the first front surface 58 of the piston 46 and the casing 45 and the bottom recess section 67 extending between the sealing element 50 and the second front surface 59 of the piston 46.
  • a second piston channel 61b is extending from the lateral surface 60 of the piston 46 to the first piston channel 61a.
  • the second piston channel 61b enables a hydraulic coupling between the gap 65 and the first piston channel 61a.
  • a groove 62 is arranged in the piston 46 which extends circumferentially over the lateral surface 60 of the piston 46 and is hydraulically coupled to the second piston channel 61b.
  • the width of the groove 62 in axial direction is larger than the width of the second piston channel 61b.
  • the fuel is led from the fluid inlet portion 26 in the housing 12 towards the valve body 20 and then towards the fluid outlet portion 28.
  • the valve needle 22 prevents a fluid flow through the fluid outlet portion 28 in the valve body in a closing position of the valve needle 22. Outside of the closing position of the valve needle 22, the valve needle 22 enables the fluid flow through the fluid outlet portion 28.
  • the piezo electric actuator may change its axial length if it gets energized. By changing its length the actuator unit 16 may effect a force on the valve needle 22. Due to the elasticity of the bellow 36 the valve needle 22 is able to move in axial direction out of the closing position. Outside the closing position of the valve needle 22 there is a gap between the valve body 20 and the valve needle 22 at an axial end of the injection valve 10 facing away from the actuator unit 16. The gap is forming a valve nozzle 29.
  • the main spring 30 can force the valve needle 22 via the valve needle spring rest 34 towards the actuator unit 16. In the case the actuator unit 16 is de-energized the actuator unit 16 shortens its length. Due to the elasticity of the bellow 36 the main spring 30 can force the valve needle 22 to move in axial direction its closing position. It is depending on the force balance between the force on the valve needle 22 caused by the actuator unit 16 and the force on the valve needle 22 caused by the main spring 30 whether the valve needle 22 is in its closing position or not. If the valve needle 22 is not in its closing position a fuel flow is enabled through the valve nozzle 29.
  • the thermal compensation arrangement 14 serves two purposes: first the compensation of changes of the length of the actuator unit 16 due to thermal variations which are comparable slow changes and second the compensation of impulsive forces of the actuator unit 16 due to an energizing and a de-energizing of the actuator unit 16 which result in relative fast movements of the piston 46 in the casing 45 of the thermal compensation arrangement 14.
  • the function of the thermal compensation arrangement 14 concerning the fast movements of the piston 46 due to energizing and de-energizing of the actuator unit 16 will be described in detail:
  • thermal compensation arrangement 14 is shown in its initial state. This means that the actuator unit 16 is de-energized and the piston 46 is in contact with the piston rest 51 due to the spring forces of the compensation spring 44.
  • the actuator unit 16 If the actuator unit 16 is energized and therefore changes its length to move the valve needle 22 out of the closing position simultaneously the piston 46 in the recess 54 of the casing 45 is moved in axial direction in a first piston movement direction P1 (Fig. 3) away from the sealing element 50.
  • This movement causes a pressure wave in the recess section 66 between the first front surface 58 of the piston 46 and the casing 45 of the thermal compensation arrangement 14.
  • the pressure wave in the fluid forces the fluid in the recess 54 to flow in a fluid flow direction F from the recess section 66 to the gap 65.
  • the piston 46 starts to move in the first piston direction P1 the piston 46 looses contact with the piston rest 51 allowing the fluid flowing from the gap 65 to the bottom recess section 67 adjacent to the sealing element 50.
  • the piston 46 of the thermal compensation arrangement 14 is forced to move in a second piston movement direction P2 (Fig. 4) towards the sealing element 50.
  • P2 a second piston movement direction
  • the piston 46 creates a pressure wave in the fluid being in the first piston channel 61a which opens the flap 64.
  • this fluid flows through the first piston channel 61a into the recess section 66 between the first front surface 58 of the piston 46 and the casing 54.

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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)
EP20060016135 2006-08-02 2006-08-02 Arrangement thermique de compensation dans une valve d'injection Not-in-force EP1887216B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200660011604 DE602006011604D1 (de) 2006-08-02 2006-08-02 Anordnung zum thermischen Ausgleich in einem Einspritzventil
EP20060016135 EP1887216B1 (fr) 2006-08-02 2006-08-02 Arrangement thermique de compensation dans une valve d'injection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20060016135 EP1887216B1 (fr) 2006-08-02 2006-08-02 Arrangement thermique de compensation dans une valve d'injection

Publications (2)

Publication Number Publication Date
EP1887216A1 true EP1887216A1 (fr) 2008-02-13
EP1887216B1 EP1887216B1 (fr) 2010-01-06

Family

ID=37502181

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060016135 Not-in-force EP1887216B1 (fr) 2006-08-02 2006-08-02 Arrangement thermique de compensation dans une valve d'injection

Country Status (2)

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EP (1) EP1887216B1 (fr)
DE (1) DE602006011604D1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2110199A1 (fr) 2008-04-18 2009-10-21 Continental Automotive GmbH Ensemble ajusté à interférence, agencement de compensation thermique d'une soupape à injection et procédé de production d'un ensemble ajusté à interférence
EP2141346A1 (fr) * 2008-07-03 2010-01-06 Continental Automotive GmbH Agencement de compensation thermique et soupape d'injection

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002031349A1 (fr) * 2000-10-11 2002-04-18 Siemens Vdo Automotive Corporation Ensemble compensateur muni d'une soupape sensible a la pression destine a etre accouple a un actionneur a solide situe dans un injecteur de carburant
EP1391608A1 (fr) * 2002-08-20 2004-02-25 Siemens VDO Automotive S.p.A. Doseur avec unité de compensation thermique
EP1519035A1 (fr) * 2003-09-17 2005-03-30 Robert Bosch GmbH Soupape d'injection de combustible
EP1591656A2 (fr) * 2004-04-26 2005-11-02 Isuzu Motors Limited Méchanisme d'absortion de l'expansion différentielle et une soupape d'injection de combustible comprenant celui-ci

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002031349A1 (fr) * 2000-10-11 2002-04-18 Siemens Vdo Automotive Corporation Ensemble compensateur muni d'une soupape sensible a la pression destine a etre accouple a un actionneur a solide situe dans un injecteur de carburant
EP1391608A1 (fr) * 2002-08-20 2004-02-25 Siemens VDO Automotive S.p.A. Doseur avec unité de compensation thermique
EP1519035A1 (fr) * 2003-09-17 2005-03-30 Robert Bosch GmbH Soupape d'injection de combustible
EP1591656A2 (fr) * 2004-04-26 2005-11-02 Isuzu Motors Limited Méchanisme d'absortion de l'expansion différentielle et une soupape d'injection de combustible comprenant celui-ci

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2110199A1 (fr) 2008-04-18 2009-10-21 Continental Automotive GmbH Ensemble ajusté à interférence, agencement de compensation thermique d'une soupape à injection et procédé de production d'un ensemble ajusté à interférence
US8517339B2 (en) 2008-04-18 2013-08-27 Continental Automotive Gmbh Interference fit assembly, a thermal compensation arrangement of an injection valve and method for producing an interference fit assembly
EP2141346A1 (fr) * 2008-07-03 2010-01-06 Continental Automotive GmbH Agencement de compensation thermique et soupape d'injection

Also Published As

Publication number Publication date
DE602006011604D1 (de) 2010-02-25
EP1887216B1 (fr) 2010-01-06

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