WO2005031152A1 - Soupape d'injection avec element de compensation hydraulique - Google Patents

Soupape d'injection avec element de compensation hydraulique Download PDF

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Publication number
WO2005031152A1
WO2005031152A1 PCT/EP2004/051859 EP2004051859W WO2005031152A1 WO 2005031152 A1 WO2005031152 A1 WO 2005031152A1 EP 2004051859 W EP2004051859 W EP 2004051859W WO 2005031152 A1 WO2005031152 A1 WO 2005031152A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
cylinder
injection valve
injector
spring
Prior art date
Application number
PCT/EP2004/051859
Other languages
German (de)
English (en)
Inventor
Willibald SCHÜRZ
Martin Simmet
Hanspeter Zink
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2005031152A1 publication Critical patent/WO2005031152A1/fr

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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
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • 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
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • 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 an injection valve, in particular a piezo injector with a plurality of components and with a compensation device for compensating for play between at least two of the components. Furthermore, the invention relates to a method for compensating the play of mechanical components in an injection valve, in particular in a piezo injector with a cylinder and a piston, which is movable in the cylinder.
  • the object of the present invention is to further improve the known closed hydraulic systems.
  • the movable membrane is used in such a way that it is arranged on the cylinder in such a way that the membrane forms one end of the closed hydraulic system. This means that the membrane represents one end of the closed hydraulic system.
  • the membrane is pressed against a cylinder with a spring.
  • the membrane can be moved when the distance between the individual components changes, thus compensating for the play.
  • a spring that presses against the membrane is preferably attached to a piston rod that is firmly connected to a piston.
  • the piston is movable in the cylinder.
  • the spring plate is positioned on the piston rod in such a way that the piston is adjusted with respect to its position in the idle state and when the desired play in the cylinder is set for the first time so that the height of an upper working volume is above the piston is equal to the height of a working volume under the piston.
  • the maximum stroke of the piston is preferably designed such that the expected thermal expansion and the possible wear of the injector can be compensated for.
  • the adjustment of the play between the two components can be achieved in that a closed hydraulic system is provided in the cylinder, which has an upper working volume above the piston and a lower working volume below the piston.
  • the piston is mounted in the cylinder so that it can move in the direction of the two working volumes.
  • An occurring pressure difference is now reduced between the upper and lower working volumes by providing a joint gap between the upper and lower working volumes.
  • the joining gap is preferably dimensioned such that it can only develop its compensating effect for slow volume changes.
  • quick changes especially changes that occur in less than 0.1 seconds, cannot be dismantled. This ensures that only temperature changes or wear are compensated for.
  • Rapid dynamic changes on the other hand, are not taken into account in volume compensation. There- with these rapid dynamic changes, which result from the control of the nozzle, are available for dynamic operation of the nozzle.
  • a compensation device has a piston and a cylinder which are guided axially one inside the other and are axially displaceable relative to one another.
  • a movable membrane (20) seals the open end of the pot-shaped cylinder (12).
  • a pressure-exciting spring comprises a piston rod which is fastened on its first axial end area in the central bore of the piston, the spring acting on the first face of the movable diaphragm or the outer ring serving as its radial fixation and a spring plate on its second face applied, which is attached to the second end portion of the piston rod.
  • the axial position of the spring plate on the piston rod and the axial position of the piston in the cylinder are at rest, e.g. immediately after assembling the injector, set so that the height of an upper working volume above the piston is equal to the height of a lower working volume below the piston.
  • the maximum stroke of the piston in the cylinder is smaller than the change in the injector idle stroke, which can be caused by temperature changes and / or wear of injector components.
  • the compensation device is preferably designed as a module, which is arranged between a piezoelectric actuator and a nozzle needle or preferably a control valve. Further developments and advantageous embodiments of the invention are shown in the figures. Show it:
  • Figure 1 is a sectional view of a piston / cylinder arrangement with a compensation device
  • Figure 2 an injection valve
  • FIG. 1 shows a piston / cylinder arrangement 10 with a cylinder 12 and a piston 14, which is connected to a piston rod 16.
  • the piston 14 is arranged in the cylinder 12 such that it can be moved up and down in the direction of the piston rod 16 with a slight play of, for example, 10 ⁇ m.
  • the piston rod 16 is preferably pressed into the piston 14.
  • the interior of the cylinder 12, in which the piston 14 can be moved, is provided with a seal, so that a closed hydraulic system is formed within the cylinder 12.
  • the seal can be formed by three parts, namely the piston rod 16, an outer ring 18 and a membrane 20.
  • the membrane 20 is preferably designed as a vulcanized elastomer. With this seal it can already be ensured that the hydraulic volume, which is located within the cylinder 12, is tightly enclosed for the service life.
  • the membrane 20 is designed in such a way that it is movable and thus enables a relative movement between the piston 14 and the cylinder 12.
  • a defined internal pressure inside the cylinder 12 is preferably generated with a spring 22.
  • the spring 22 is supported on the membrane 20, preferably via a pressure ring 24.
  • the defined spring pressure on the diaphragm is then generated by providing a spring plate 26 on the piston rod 16, the spring being supported on the spring plate 26.
  • the position of the spring plate 26 determines the internal pressure in the cylinder 12.
  • the piston rod 16 is first pressed into the piston 14.
  • the piston 14 is then guided into the cylinder 12.
  • the outer ring 18 can then be welded to the cylinder 12 in a gas-tight manner, a laser welding method being used here, for example.
  • the pressure ring 24, the spring 22 and the spring plate 26 can be mounted.
  • the spring plate 26 is preferably fixed on the piston rod 16 by a press fit.
  • the restoring force of the spring 22 and thus the internal pressure of the hydraulic system in the cylinder 12 can be set.
  • the hydraulic system inside the cylinder 12 is evacuated via a filling bore 28 and filled with gas-free oil.
  • the system is then sealed.
  • a ball 30 can be pressed in, so that the hydraulic system is tightly closed.
  • the position of the piston 14 is preferably selected so that at room temperature the height of the upper working volume VI is equal to the height of the lower working volume V2.
  • the maximum stroke of the Piston 14 in the cylinder 12 designed so that these values can also be compensated.
  • the hydraulic area of the upper working volume VI is larger than the hydraulic area of the lower working volume V2, which is below the piston 14. This leads to a hydraulic force that pushes the piston 14 out of the cylinder 12 in the direction of the piston rod 16.
  • the cylinder 12 rests on the bottom plate of the piezo actuator 10 and the piston rod 16 on the bottom of the servo valve without play.
  • the pressure difference between the two working volumes VI and V2 can be compensated for via the joint gap 32 between the cylinder 12 and the piston 14.
  • FIG. 2 shows a schematic illustration of an injection valve with a piston / cylinder arrangement 10 according to FIG. 1.
  • the injection valve has a piezoelectric actuator 41, which is operatively connected to a closing element 42 via the piston / cylinder arrangement 10.
  • the closing member 42 is assigned to a sealing seat of an outlet 52 of a control room 51.
  • the closing member 42 is biased against the sealing seat by a biasing spring, which is not shown in the figure.
  • the control chamber 51 is also delimited by a control piston 43 which is movably held in the injection valve 40.
  • the control piston 43 is operatively connected to an injection needle 44.
  • the tip of the injection needle 44 is assigned to a second sealing seat, which is arranged in the transition between a fuel chamber 45 and a blind hole 46.
  • the blind hole 46 is provided with injection holes 47.
  • the injection valve 40 also has a fuel bore 49 which is connected to the control chamber 51 via an inlet throttle 50.
  • the fuel hole 49 is also connected to the fuel chamber 45 via an inlet 48.
  • the injection valve works as follows: The pressure in the control chamber 51 determines the position of the injection needle 44. Fuel flows in via the inlet throttle 50 the control chamber 51 and via the inlet 48 into the fuel chamber 45. If the piezoelectric actuator 41 is not activated, the closing member 42 closes the outlet 52.
  • the control chamber 51 therefore has a high fuel pressure, so that the control piston 43 is pressed downward , As a result, the injection needle 44 is pressed with its sealing surface onto the sealing seat. There is therefore no hydraulic connection between the fuel space 45 and the injection holes 47.

Landscapes

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

Abstract

Lors de l'utilisation d'injecteurs, en particulier pour des moteurs à combustion interne, un jeu existant doit être compensé. Pour compenser ce jeu, un système hydraulique fermé est créé ; un volume de travail supérieur (V1) est formé au-dessus d'un piston (14) et un volume de travail inférieur (V2) est formé au-dessous du piston (14). Une différence de pression apparaissant entre le volume de travail inférieur et supérieur (V1, V2) est ensuite compensée par un espace de jonction (32), si cette différence de pression s'établit lentement.
PCT/EP2004/051859 2003-09-23 2004-08-20 Soupape d'injection avec element de compensation hydraulique WO2005031152A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10344061.5 2003-09-23
DE2003144061 DE10344061A1 (de) 2003-09-23 2003-09-23 Einspritzventil mit einem hydraulischen Ausgleichselement

Publications (1)

Publication Number Publication Date
WO2005031152A1 true WO2005031152A1 (fr) 2005-04-07

Family

ID=34384230

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2004/051859 WO2005031152A1 (fr) 2003-09-23 2004-08-20 Soupape d'injection avec element de compensation hydraulique

Country Status (2)

Country Link
DE (1) DE10344061A1 (fr)
WO (1) WO2005031152A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1731753A1 (fr) * 2005-06-06 2006-12-13 Siemens Aktiengesellschaft Injecteur et compensateur pour un injecteur
EP1811167A1 (fr) * 2006-01-24 2007-07-25 Siemens VDO Automotive S.p.A. Injecteur, compensateur pour l'injecteur, dispositif de décharge pour le compensateur ainsi que méthodes d'assemblage et de calibration associées
EP1826398A1 (fr) * 2006-01-24 2007-08-29 Siemens VDO Automotive S.p.A. Injecteur, assemblage de compensation pour l'injecteur et dispositif de dégagement pour l'assemblage de compensation, procédé d'assemblage et d'étalonnage de l'injecteur et procédé de production du dispositif de dégagement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1780405B1 (fr) * 2005-10-26 2008-09-17 Siemens Aktiengesellschaft Injecteur, dispositif de compensation pour l'injecteur et moyen de transmission de pression pour le dispositif de compensation
DE102015219912B3 (de) * 2015-10-14 2017-04-06 Continental Automotive Gmbh Piezo-Injektor zur Kraftstoffeinspritzung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19708304A1 (de) * 1997-02-28 1998-09-10 Siemens Ag Vorrichtung zur Übertragung einer Bewegung und Einspritzventil mit einer Vorrichtung zur Übertragung einer Bewegung
DE19858476A1 (de) * 1998-12-17 2000-06-29 Siemens Ag Vorrichtung zum Übertragen einer Aktorauslenkung auf ein Stellglied und Einspritzventil mit einer solchen Vorrichtung
US20020139863A1 (en) * 2000-10-11 2002-10-03 Jack Lorraine Compensator assembly having a flexible diaphragm and an internal filling tube for a fuel injector and method
WO2002095212A1 (fr) * 2001-05-23 2002-11-28 Westport Research Inc. Soupape a injection actionnee directement
DE10140799A1 (de) * 2001-08-20 2003-03-06 Bosch Gmbh Robert Brennstoffeinspritzventil

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19950760A1 (de) * 1999-10-21 2001-04-26 Bosch Gmbh Robert Brennstoffeinspritzventil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19708304A1 (de) * 1997-02-28 1998-09-10 Siemens Ag Vorrichtung zur Übertragung einer Bewegung und Einspritzventil mit einer Vorrichtung zur Übertragung einer Bewegung
DE19858476A1 (de) * 1998-12-17 2000-06-29 Siemens Ag Vorrichtung zum Übertragen einer Aktorauslenkung auf ein Stellglied und Einspritzventil mit einer solchen Vorrichtung
US20020139863A1 (en) * 2000-10-11 2002-10-03 Jack Lorraine Compensator assembly having a flexible diaphragm and an internal filling tube for a fuel injector and method
WO2002095212A1 (fr) * 2001-05-23 2002-11-28 Westport Research Inc. Soupape a injection actionnee directement
DE10140799A1 (de) * 2001-08-20 2003-03-06 Bosch Gmbh Robert Brennstoffeinspritzventil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1731753A1 (fr) * 2005-06-06 2006-12-13 Siemens Aktiengesellschaft Injecteur et compensateur pour un injecteur
US7673811B2 (en) 2005-06-06 2010-03-09 Siemens Aktiengesellschaft Injection valve and compensating element for an injection valve
EP1811167A1 (fr) * 2006-01-24 2007-07-25 Siemens VDO Automotive S.p.A. Injecteur, compensateur pour l'injecteur, dispositif de décharge pour le compensateur ainsi que méthodes d'assemblage et de calibration associées
EP1826398A1 (fr) * 2006-01-24 2007-08-29 Siemens VDO Automotive S.p.A. Injecteur, assemblage de compensation pour l'injecteur et dispositif de dégagement pour l'assemblage de compensation, procédé d'assemblage et d'étalonnage de l'injecteur et procédé de production du dispositif de dégagement

Also Published As

Publication number Publication date
DE10344061A1 (de) 2005-04-28

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