EP1319126A1 - Systeme hydraulique ferme - Google Patents

Systeme hydraulique ferme

Info

Publication number
EP1319126A1
EP1319126A1 EP01964916A EP01964916A EP1319126A1 EP 1319126 A1 EP1319126 A1 EP 1319126A1 EP 01964916 A EP01964916 A EP 01964916A EP 01964916 A EP01964916 A EP 01964916A EP 1319126 A1 EP1319126 A1 EP 1319126A1
Authority
EP
European Patent Office
Prior art keywords
hydraulic system
grooves
piston
guide surfaces
cylinder
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.)
Ceased
Application number
EP01964916A
Other languages
German (de)
English (en)
Inventor
Willibald SCHÜRZ
Wolfgang Bloching
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 EP1319126A1 publication Critical patent/EP1319126A1/fr
Ceased legal-status Critical Current

Links

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
    • 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

Definitions

  • the invention relates to a closed hydraulic system, in particular according to the preamble of claim 1.
  • the drive can be kept free of play over its service life, so that the entire actuator stroke is always available as a useful stroke.
  • a game compensation element that is designed as a closed system does not have this disadvantage.
  • a cylinder-piston unit is used which has a specific one
  • Fine grooves on the guide surfaces of cylinder-piston systems are known from WO 9949209.
  • This is an injection valve needle (the piston) which is tightly guided in an injection valve housing (the cylinder) and which together form an open hydraulic system.
  • the micro-grooves arranged on the guide surface of the valve needle are intended to achieve a uniform pressure distribution in the fit gap, one. Centering the injector needle in the injector housing causes. Wear-avoiding, one-sided application of the injection valve needle and increased leakage due to the enlarged fit gap on one side are thereby avoided. Degassing the fit gap is not necessary with this open system and, in contrast to a closed system, is not possible either.
  • the object of the invention is to ensure the degassing of the fitting gaps quickly and completely in the case of closed hydraulic systems, in particular in the case of play compensation elements.
  • the object is achieved by the characterizing features of claim 1.
  • the fine grooves represent flow channels which serve for the rapid and complete discharge of the gases present in the fit gap. This significantly reduces the time required for the complete degassing of the hydraulic fluid.
  • the degassing of a closed hydraulic system takes place by filling it under a negative pressure of approximately 10 "4 mbar. Because the grooves preferably extend over the entire length of the guide surfaces and both ends of the grooves are exposed to the negative pressure in this way, The effect of pressure equalization in the fit gap also occurs when the closed hydraulic system is in operation and also reduces wear and leakage.
  • the parallelism of the grooves allows the guide surfaces to be densely covered with the same.
  • the fine thread formed by a single groove is particularly easy to manufacture. Its low pitch of 0.3 mm as well as its preferred depth of 0.02 mm and width of 0.09 mm serve to quickly degas the fitting gap and at the same time to ensure a long service life for the guide surfaces and to minimize leakage.
  • the specification of the depth of the grooves based on the nominal diameter of the guide surfaces takes into account different dimensions of closed hydraulic systems.
  • Machining processes such as precision turning, grinding, milling or processes using laser or electron beams can be used to produce the grooves.
  • the surface quality of the guide surfaces is optimized by fine machining before and after the grooves are made. Processes such as lapping or fine grinding are suitable for this.
  • Fig. 1 shows a section through a closed play compensation element and Fig. 2 shows a detail section through a guide surface with grooves.
  • the hydraulic system according to the invention is preferably used in an injection valve, in particular a diesel injection valve, in order to transmit the deflection of an actuator to an actuator.
  • a servo valve or an injection needle is provided as the actuator.
  • a cylinder 1 is clamped with its two flat surfaces 4 in a housing, for example an injector housing.
  • Two pistons 2, 3, one of which is designed as a hollow piston 2 and the other as a reciprocating piston 3, are inserted in the cylinder 1.
  • the hollow piston 2 runs in a guide 25 of the cylinder 1 and the reciprocating piston 3 in a corresponding guide 26 of the hollow piston 2.
  • fitting gaps 24 are formed, which the Have the form of annular gaps.
  • a pressure chamber 6 is formed by adjacent end faces 22, 23 of the pistons 2, 3 arranged one inside the other and the guide of the cylinder 1.
  • a compression spring 8 is inserted, via which a restoring force is applied.
  • an elastic storage reservoir 10 which is composed of two first and second metal bellows 11, 12 pushed into one another, is arranged at one end of the cylinder 1.
  • a storage space 14 is provided in the form of a third metal bellows 13, which Seals piston 3 to the outside.
  • the storage reservoir 14 is connected to the pressure chamber 6 and to the fitting gaps 24 via a second passage 16 of the hollow piston 2, the spring chamber 17 and a third passage 20 of the lifting piston 3.
  • the third passage 20 of the reciprocating piston 3 comprises a valve 9 which opens in the flow direction from the spring chamber 17 to the pressure chamber 6 and closes in the opposite direction.
  • the storage space 14 is connected via a first passage 15 to the spring space 17 and the second passage 16 to the storage reservoir 10.
  • a filling passage 18 with a closure element 19 is provided for filling the device with a transmission medium with low compressibility, such as hydraulic fluid.
  • the filling passage leads from the outside to the pressure chamber 6 and to the storage chamber 14.
  • a pressure force is exerted on an end face 15 of the hollow piston 2 via a piezo actuator (not shown), as a result of which the hollow piston 2 is displaced downward by the stroke of the piezo actuator.
  • a pressure is built up in the pressure chamber 6, which lifts the reciprocating piston 3 against the direction of movement of the hollow piston 2.
  • the end face 7 of the reciprocating piston 3 is connected to an element (not shown) to be actuated, such as a control valve.
  • the control valve is thus opened by this movement of the reciprocating piston 3.
  • the restoring force is applied by the spring 8 which, when the piezo actuator is not actuated, brings about both the sealing force on the control valve and the contact force on the piezo actuator.
  • the amount of transmission medium is replenished from the storage reservoir 10, which escapes from the pressure chamber 6 as a leak when the piezo actuator is actuated via the annular gaps 24.
  • the first and second metal bellows 11, 12 of the storage reservoir 10 preferably do not assume a spring function. Gas-free filling of the entire interior with the transmission medium is required for loss-free force-displacement transmission. For this purpose, the filling takes place at a negative pressure of approx. 10 ⁇ 4 mbar via the filling passage 18.
  • the degassing of the storage reservoir 10, the spring chamber 17, the first passage 15, the pressure chamber 6 and the storage chamber 14 poses no difficulties, since these are larger volumes with corresponding cross sections.
  • the narrow fitting gaps 24 are difficult to degas.
  • the guide surface 25 of the hollow piston 2 and / or the guide surface 24 of the reciprocating piston 3 and / or the guide surface of the cylinder 1, which is assigned to the hollow piston 2, are provided with a single groove 27, each of which forms a smooth thread.
  • This fine thread is shown greatly enlarged in FIG. 2. Its pitch s is 0.3 mm, its depth t is 0.02 mm and its width b is 0.09 mm.
  • the grooves 27 are used for the rapid and complete degassing of the sealing gaps 24 when filling the play compensation element with hydraulic fluid. At the same time, these bring about an even pressure distribution in the fit gap 24 during operation of the play compensation element.
  • the hollow piston 2 and the reciprocating piston 3 are centered in their guides and have no contact with the wall. This minimizes wear and leakage.
  • grooves are arranged on the guide surfaces.
  • the groove or the grooves can have different angles of inclination to the cylinder axis 21.
  • a plurality of grooves are preferably arranged parallel to one another.
  • a preferred embodiment of a groove consists of a flat thread that has a pitch s of 0.2 to 0.1 mm, preferably 0.3 mm.
  • the depth t of the groove 27 is 0.01 to 0.01 mm, preferably 0.02 mm.
  • the ratio of the depth t of the groove 27 to a nominal diameter D of the guide surfaces 25, 26 is preferably between 1/200 and 1/1000.
  • the width B of the groove 27 is 0.07 to 0.3 mm, preferably 0.09 mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Actuator (AREA)

Abstract

L'invention concerne un système hydraulique fermé, en particulier un système de compensation de jeu hydraulique, qui comprend au moins un cylindre (1) et un piston (2, 3) présentant des surfaces de guidage séparées par une fente d'ajustement. Pour que l'évacuation des gaz, nécessaire pour l'aptitude au fonctionnement, de la fente d'ajustement puisse se faire rapidement et à fond, en particulier la surface de guidage (25, 26) du piston (2, 3) est pourvue de fines rainures (27).
EP01964916A 2000-09-19 2001-08-17 Systeme hydraulique ferme Ceased EP1319126A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2000146323 DE10046323B4 (de) 2000-09-19 2000-09-19 Hydraulisches Spielausgleichssystem
DE10046323 2000-09-19
PCT/DE2001/003162 WO2002025096A1 (fr) 2000-09-19 2001-08-17 Systeme hydraulique ferme

Publications (1)

Publication Number Publication Date
EP1319126A1 true EP1319126A1 (fr) 2003-06-18

Family

ID=7656778

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01964916A Ceased EP1319126A1 (fr) 2000-09-19 2001-08-17 Systeme hydraulique ferme

Country Status (3)

Country Link
EP (1) EP1319126A1 (fr)
DE (1) DE10046323B4 (fr)
WO (1) WO2002025096A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10162045B4 (de) * 2001-12-17 2005-06-23 Siemens Ag Vorrichtung zum Übersetzen einer Auslenkung eines Aktors, insbesondere für ein Einspritzventil
DE10225686B4 (de) * 2002-06-10 2005-08-04 Siemens Ag Hubübertragungselement für ein Einspritzventil
DE10230089A1 (de) * 2002-07-04 2004-01-15 Robert Bosch Gmbh Brennstoffeinspritzventil
DE60306106T2 (de) * 2003-02-04 2006-11-16 Siemens Vdo Automotive S.P.A., Fauglia Kompensator zum Ausgleich von Wärmedehnungen für eine Dosiervorrichtung
US7500648B2 (en) 2003-02-27 2009-03-10 Robert Bosch Gmbh Fuel-injection valve
DE10360449A1 (de) * 2003-02-27 2004-09-09 Robert Bosch Gmbh Brennstoffeinspritzventil
DE10310788A1 (de) * 2003-03-12 2004-09-23 Robert Bosch Gmbh Brennstoffeinspritzventil und Verfahren zu dessen Montage
WO2005026528A1 (fr) * 2003-09-12 2005-03-24 Siemens Aktiengesellschaft Element de compensation hydraulique
WO2005113942A1 (fr) 2004-05-13 2005-12-01 Schaeffler Kg Dispositif de rattrapage de jeu hydraulique
DE102004023599B4 (de) * 2004-05-13 2014-09-04 Schaeffler Technologies Gmbh & Co. Kg Hydraulische Spielausgleichseinrichtung
DE102005014516A1 (de) * 2004-12-15 2006-06-29 Siemens Ag Kraftstoffinjektor mit einer Bypassdrossel zum schnelleren Schließen der Einspritzdüse
DE102006026877A1 (de) * 2006-06-09 2007-12-13 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine
EP1881189B1 (fr) * 2006-07-21 2014-10-29 Continental Automotive GmbH Système piston-cylindre et dispositif de compensation hydraulique
DE102008054652B4 (de) * 2008-12-15 2018-01-04 Robert Bosch Gmbh Hydraulischer Koppler
DE102017214547A1 (de) * 2017-08-21 2019-02-21 Zf Friedrichshafen Ag Pneumatische Betätigungseinrichtung für ein Kraftfahrzeug

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999049209A1 (fr) * 1998-03-26 1999-09-30 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh Unite cylindre-piston haute pression

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU8851382A (en) * 1981-12-28 1983-07-07 Stanadyne Inc. Hydraulic valve lifters
DE3418707A1 (de) * 1984-05-19 1985-10-24 Daimler-Benz Ag, 7000 Stuttgart Hydraulisches spielausgleichselement in einem ventiltrieb fuer brennkraftmaschinen
DE3704743A1 (de) * 1987-02-14 1988-08-25 Schaeffler Waelzlager Kg Steuereinrichtung fuer ein ventil
DE19813204A1 (de) 1998-03-25 1999-09-30 Bosch Gmbh Robert Flansch eines Kraftstoff-Fördermoduls und Kraftstoff-Fördermodul
DE19949497A1 (de) * 1999-10-14 2001-04-19 Volkswagen Ag Hydraulisches Spielausgleichs- und/oder Dämpfungselement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999049209A1 (fr) * 1998-03-26 1999-09-30 Mtu Motoren- Und Turbinen-Union Friedrichshafen Gmbh Unite cylindre-piston haute pression

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO0225096A1 *

Also Published As

Publication number Publication date
DE10046323A1 (de) 2002-04-18
DE10046323B4 (de) 2004-02-12
WO2002025096A1 (fr) 2002-03-28

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