EP0334924A1 - Cylindre hydraulique verrouillable - Google Patents

Cylindre hydraulique verrouillable

Info

Publication number
EP0334924A1
EP0334924A1 EP88908198A EP88908198A EP0334924A1 EP 0334924 A1 EP0334924 A1 EP 0334924A1 EP 88908198 A EP88908198 A EP 88908198A EP 88908198 A EP88908198 A EP 88908198A EP 0334924 A1 EP0334924 A1 EP 0334924A1
Authority
EP
European Patent Office
Prior art keywords
piston
locking
cylinder
hydraulic cylinder
locking parts
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
EP88908198A
Other languages
German (de)
English (en)
Other versions
EP0334924B1 (fr
Inventor
Gerhard Reuber
Reinhard Nowack
Jürgen LINKE
Rainer Jesse
Uwe Nerger
Eugen Fleisch
Peter Thiele
Gerhard NÜSSLE
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.)
Daimler Benz AG
Continental Teves AG and Co oHG
Original Assignee
Daimler Benz AG
Alfred Teves GmbH
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 Daimler Benz AG, Alfred Teves GmbH filed Critical Daimler Benz AG
Publication of EP0334924A1 publication Critical patent/EP0334924A1/fr
Application granted granted Critical
Publication of EP0334924B1 publication Critical patent/EP0334924B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions

Definitions

  • the invention relates to a lockable hydraulic cylinder according to the preamble of claim 1.
  • Hydraulic cylinders of this type are used universally in technology and are distinguished, inter alia, by the fact that they can hold larger forces securely in the locking position even without pressure medium.
  • a piston-cylinder unit is known from DE-OS 31 43 040, a locking piston movable perpendicular to the direction of movement of the working piston being provided which can be displaced into a recess in the piston rod.
  • This locking device requires a large amount of space and requires an additional pressure medium connection between the working piston and the locking piston.
  • a self-locking double-acting working cylinder in which a differential piston is axially displaceable on the one hand on its outer diameter in the housing and on the other hand with its inner channel is mounted on a housing-fixed socket, with a locking piston which on the one hand in the differential piston and on the other hand is mounted in the socket, the locking balls actuated.
  • this working cylinder three components move relative to each other within the housing, which is a relatively complicated structure; on the other hand, a complex pressure medium connection within the differential piston is required.
  • the invention is therefore based on the object of creating a generic hydraulic cylinder which is distinguished by a compact structure which can be integrated in the working cylinder, and which has a small number of relatively movable parts with a simple structure; the use of very small piston rods and piston diameters (6 to 16 mm) with very long strokes should be made possible.
  • a further solution to the problem is achieved in that a stepped piston, which is guided in a sealed manner in a blind bore of a cylinder base or a component rigidly connected to it, is provided as the closure element, which against the pressure in a working space connected to the pressure connection in the direction of
  • Locked position is biased, the portion of the cylinder bottom, in which the stepped piston is guided, protrudes into a recess in the front side of the working piston facing the input space, which has a radial undercut, into which the locking parts can be latched.
  • a particularly favorable embodiment of the invention provides that the locking parts are designed as balls.
  • a locking unit in particular symmetrical to the radial plane, is provided on both end faces of the working piston and cylinder tube.
  • the stepped piston is provided in a blind bore in the cylinder base or a component connected to it, it is advantageous if the section of the cylinder base into which the stepped piston is guided is surrounded radially by a return ring which is preloaded to a limited extent by a spring , because in this way the locking balls are secured against falling out.
  • An advantageous embodiment of the invention provides that the locking parts moving with the working piston have no contact with the cylinder tube in the unlocked position. It is therefore provided that the end of the stepped piston protruding into the entrance space projects in the locking position into a deflection bushing which is provided with a bevel which acts radially outward on the locking parts. This makes it possible for the stepped piston to clamp the locking parts in the unlocked position and for the latter to be moved outwards again only when the locking position is reached by the deflection bushing. Allow it Material or the quality of the cylinder tube that the locking parts act on the cylinder tube during the piston movement, so it is useful with the simultaneous elimination of the deflection bushing that the stepped piston is equipped with at least one conical section.
  • Fig. 1 shows a first embodiment
  • Fig. 2 shows a second embodiment of the invention in the locked state
  • FIG. 3 shows an embodiment according to FIG. 2 in the unlocked state
  • Fig. 4 shows a third embodiment of the invention.
  • the hydraulic cylinder shown in Fig. 1 consists of a cylinder tube 1 which is screwed to the cylinder base 2 and in which the working piston 3 is axially displaceable and is guided by the sealing rings 4 and 5 sealed.
  • the cylinder base 2 has a pressure connection 7 which can be connected to a pressure medium source and which is connected to the input space 8 also provided in the cylinder base 2.
  • a blind bore 13 is provided, in which the stepped piston 6 is arranged to be axially displaceable and acted upon by the spring 14 in the direction of the input space 8.
  • the spring 14 is supported on the one hand on the bottom of the blind bore 13 and on the other hand on a further blind bore 16 which is provided in the stepped piston 6.
  • the stepped piston 6 is sealed by the sealing ring 17, which is located in an annular groove in the working piston 3 or locking piston 6.
  • the end section of the working piston 3 facing the input space 8 is provided on its jacket side with three radial through bores 15, in each of which a locking part 10 designed as a ball is guided so as to be radially movable.
  • the locking parts 10 are pressed radially outward into an annular groove-shaped radial recess 11 in the cylinder base 2 by the force of the spring 14 in conjunction with a first conical section 19 on the stepped piston 6.
  • the locking device described above unlocks itself.
  • the stepped piston 6 pushed against the force of the spring 14 into the blind bore 13 of the working piston 2.
  • the locking parts 10 can move radially inward and thus release the locking in the piston head 2.
  • the locking parts 10 are pressed against the inner wall of the cylinder tube 1 by the remaining excess force of the spring 14 in connection with the second conical section 20 on the stepped piston with a small radial force component.
  • the working piston 3 can be reset hydraulically, for example, via a working chamber opposite the input space 8 on the other side of the working piston, or else mechanically via the piston rod 21 screwed into the working piston 3.
  • the stepped piston 6 has a piston section 25 which is either very weakly conical or cylindrical, to which a cylindrical section 26 adjoins.
  • a piston section 25 which is either very weakly conical or cylindrical, to which a cylindrical section 26 adjoins.
  • a deflection bushing 29 is attached to the cylinder base 2 in the region of the input space 8. This has, on its end facing the working piston 3, an oblique chamfer 30 attached to the outer lateral surface.
  • the cylindrical section 26 of the stepped piston 6 moves into the deflection bushing 29, the locking parts 10 are moved radially outward by the application of the oblique chamfer 30.
  • radial passage channels 31 are provided distributed over the circumference of the deflection bushing 29.
  • the locking parts 10 do not cover an axial stroke path with the working piston 3.
  • the step piston 6 is sealed by the seal 42 and axially displaceable in an insert cylinder 41, which with the cylinder bottom
  • a stepped, axial through bore is provided in the cylinder base 2; a sealing ring 44 is provided in an annular groove on the insert cylinder 41.
  • the insert cylinder 41 protrudes into an axial recess 45 which is in the working cylinder
  • This recess 45 is provided with a radial undercut into which the locking parts 10 can be moved to lock the working piston 3. For this purpose, they are loaded radially outwards by the conical first step 46 on the step piston 6 in cooperation with the compression spring 48 acting on the step piston 6.
  • the working piston 3 is unlocked by introducing pressure into the pressure connection 7, which continues through the passage channels 49 in a radial expansion of the insert cylinder 41 into the working space 50 and from there through the radially extending channel 51 in the working piston 3.
  • the stepped piston 6 is moved into the insert cylinder 41 against the force of the compression spring 48.
  • the locking parts 10 are moved radially inward until they come to rest on the second step 47 of the step piston 6.
  • the working piston 3 moves away from the pressure connection 7, while at the same time the return ring 54, which radially surrounds the insert cylinder 41 and is biased by the return spring 55, the Working piston 3 is tracked until the stop 56 of the return ring 54 comes to rest on the step 57 of the insert cylinder 41.
  • the return spring 55 is supported on the one hand on the radial extension of the insert cylinder 41, to which the passage 49 is also attached, and on the other hand on an outer step of the return ring 54.
  • the path that the return ring 54 can travel conditionally through the return spring 55 is dimensioned such that the recesses 58, in which the locking parts 10 are guided, are passed axially. As a result, the locking parts 10 are secured against falling out of their recesses 58.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)

Abstract

Un cylindre hydraulique verrouillable comprend un tuyau cylindrique (1) pourvu d'au moins un raccord de refoulement (7), d'un piston (3) mobile scellé dans le tuyau cylindrique (1) et d'un élément de fermeture hydrauliquement actionnable pouvant être enclenché par des éléments de blocage (10). Afin d'obtenir une unité de verrouillage compacte pouvant également faire partie intégrante du cylindre, avec un nombre réduit de parties mobiles les unes par rapport aux autres, de conception simple et de petites dimensions, l'élément de fermeture est un piston à gradins (6) qui se déplace de manière étanche dans un alésage borgne du piston (3) et qui est pré-contraint contre la pression dans le sens de la position de verrouillage avec un espace d'admission (8) relié au raccord de refoulement (7). Le diamètre des gradins du piston à gradins se réduit vers l'espace d'admission (8) et le piston à gradins (6), sollicité par précontrainte, applique une force radiale vers l'extérieur sur les éléments de blocage (10). Des évidements radiaux (11, 15) dans lesquels pénètrent par encliquetage les éléments de blocage (10) sont ménagés dans le tuyau cylindrique (1) ou dans une pièce rigidement fixée à celui-ci, ainsi que dans le piston (3).
EP88908198A 1987-09-26 1988-09-13 Cylindre hydraulique verrouillable Expired - Lifetime EP0334924B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873732561 DE3732561A1 (de) 1987-09-26 1987-09-26 Verriegelbarer hydraulikzylinder
DE3732561 1987-09-26

Publications (2)

Publication Number Publication Date
EP0334924A1 true EP0334924A1 (fr) 1989-10-04
EP0334924B1 EP0334924B1 (fr) 1992-06-17

Family

ID=6337005

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88908198A Expired - Lifetime EP0334924B1 (fr) 1987-09-26 1988-09-13 Cylindre hydraulique verrouillable

Country Status (4)

Country Link
EP (1) EP0334924B1 (fr)
JP (1) JP2701906B2 (fr)
DE (2) DE3732561A1 (fr)
WO (1) WO1989002987A1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3913009C2 (de) * 1989-04-20 1994-08-11 Wolfgang Dipl Ing Niemann Pneumatik-Zylinder mit Endstellungs-Verriegelung
DE4107724A1 (de) * 1991-03-11 1992-09-24 Hella Kg Hueck & Co Stellantrieb
DE4107980A1 (de) * 1991-03-13 1992-09-17 Bosch Gmbh Robert Hydraulisch betaetigte rasteinrichtung
DE4215031C2 (de) * 1992-05-07 2003-12-04 Ise Gmbh Verriegelbare Kolbenbetätigung für den Transport eines Überrollbügels für Kraftfahrzeuge
JPH08193605A (ja) * 1995-01-13 1996-07-30 Itec Kk エンドロック付きシリンダ
DE19606724A1 (de) * 1996-02-23 1997-08-28 Schaeffler Waelzlager Kg Vorrichtung zum Verändern der Öffnungs- und Schließzeiten von Gaswechselventilen einer Brennkraftmaschine
DE19727590C1 (de) * 1997-06-28 1998-07-23 Daimler Benz Ag Crashkupplung für einen Überrollbügel in einem Kraftwagen
DE29806525U1 (de) * 1998-04-09 1999-09-02 Maschinenfabrik Kemper GmbH & Co. KG, 48703 Stadtlohn Ladewagen zur Beförderung von insbesondere Erntegut
DE19916678C1 (de) * 1999-04-14 2001-02-01 Daimler Chrysler Ag Antriebsvorrichtung für einen Überrollbügel
DE10323118B4 (de) * 2003-05-22 2011-07-21 Bayerische Motoren Werke Aktiengesellschaft, 80809 Einrichtung zum manuellen Reversieren einer Vorrichtung zum Schutz von Personen bei einem Frontalaufprall auf ein Kraftfahrzeug
DE10343714B4 (de) * 2003-09-20 2005-12-08 Niemann, Wolfgang, Dipl.-Ing. Verriegelbarer Pneumatikzylinder
US7784392B1 (en) 2006-10-12 2010-08-31 HDM Hydraulics, LLC Hydraulic locking cylinder
DE102008011731A1 (de) * 2008-02-28 2009-09-03 GM Global Technology Operations, Inc., Detroit Pneumatischer Aktuator
CN108825584B (zh) * 2018-07-11 2020-04-07 永红保定铸造机械有限公司 一种具有自锁功能的活塞式执行机构
CN109630497A (zh) * 2018-11-30 2019-04-16 湖南协力液压有限公司 一种预紧密封液压缸
CN113847301B (zh) * 2021-09-18 2024-02-02 湖北航天技术研究院总体设计所 一种抗侧向力的油缸
CN114087396B (zh) * 2021-11-24 2023-06-06 四川凌峰航空液压机械有限公司 自锁式气液转换阀

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR803805A (fr) * 1935-03-28 1936-10-09 Elektronmetall Gmbh Entretoise de longueur variable pour avions
FR51778E (fr) * 1941-09-12 1943-05-03 Mahle Kommandit Ges Entretoise de longueur variable pour avions
US2887991A (en) 1954-03-29 1959-05-26 Haskel Engineering Associates Fluid actuator with locking means
US3397620A (en) * 1966-10-06 1968-08-20 Milwaukee Cylinder Corp Fluid actuator with annular piston locking means
US3614912A (en) * 1969-09-29 1971-10-26 Lionel Pacific Inc Telescoping piston central lock hydraulic actuator
JPS5321288B2 (fr) * 1972-08-11 1978-07-01
US4586425A (en) 1980-06-09 1986-05-06 General Dynamics Pomona Division Clamp locking device
DE3143040A1 (de) * 1981-10-30 1983-05-05 Wabco Westinghouse Fahrzeugbremsen GmbH, 3000 Hannover Einrichtung zum arretieren eines druckmittelbetaetigten doppeltwirkenden kolbenzylinderantriebes
GB2128680B (en) * 1982-10-08 1986-03-12 Johnston Brothers Hydraulic cylinder and piston
US4635536A (en) * 1983-09-19 1987-01-13 Miller Fluid Power Corporation Cylinder locking apparatus
IT1177258B (it) * 1984-11-19 1987-08-26 Alfa Romeo Auto Spa Attuatore autobloccante, a fluido

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8902987A1 *

Also Published As

Publication number Publication date
JPH02501403A (ja) 1990-05-17
DE3732561C2 (fr) 1992-10-08
EP0334924B1 (fr) 1992-06-17
JP2701906B2 (ja) 1998-01-21
WO1989002987A1 (fr) 1989-04-06
DE3872222D1 (de) 1992-07-23
DE3732561A1 (de) 1989-04-13

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