EP0618372B1 - Dispositif hydraulique de commande avec au moins un clapet anti-retour piloté - Google Patents

Dispositif hydraulique de commande avec au moins un clapet anti-retour piloté Download PDF

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Publication number
EP0618372B1
EP0618372B1 EP94102873A EP94102873A EP0618372B1 EP 0618372 B1 EP0618372 B1 EP 0618372B1 EP 94102873 A EP94102873 A EP 94102873A EP 94102873 A EP94102873 A EP 94102873A EP 0618372 B1 EP0618372 B1 EP 0618372B1
Authority
EP
European Patent Office
Prior art keywords
valve
control device
piston
deblocking
designed
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.)
Expired - Lifetime
Application number
EP94102873A
Other languages
German (de)
English (en)
Other versions
EP0618372A2 (fr
EP0618372A3 (fr
Inventor
Michel Duby
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0618372A2 publication Critical patent/EP0618372A2/fr
Publication of EP0618372A3 publication Critical patent/EP0618372A3/fr
Application granted granted Critical
Publication of EP0618372B1 publication Critical patent/EP0618372B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/01—Locking-valves or other detent i.e. load-holding devices
    • F15B13/015—Locking-valves or other detent i.e. load-holding devices using an enclosed pilot flow valve

Definitions

  • the invention is based on a hydraulic control device at least one hydraulically unlockable check valve after the Genus of the main claim.
  • the hydraulic control device with at least a hydraulically unlockable check valve and with the characteristic
  • features of the main claim have the advantage that they are less prone to wear, especially under heavy loads and therefore achieves a longer service life.
  • the Control device builds with relatively little effort, simple and compact. Through the additional guide point of the unlocking piston in immediate vicinity of the check valve can be on the Forces acting on the locking piston are much better on the housing transfer.
  • the flow resistance in the two pressure medium connections only insignificant due to the guide bars on the unlocking piston increased so that the function of the locking block is not disturbing being affected.
  • the guide length can now advantageously of the unlocking piston correspond to almost its entire length. Leakage problems on the unlocking piston caused by wear and associated failures of the control device are avoided.
  • FIG. 1 shows a longitudinal section through a first hydraulic Control device in a simplified representation
  • Figure 2 is a front view of the unlocking piston of Figure 1
  • Figure 3 is a side view of the unlocking piston according to Figure 2
  • Figure 4 a second embodiment of the unlocking piston for the control device according to FIG. 1.
  • FIG. 1 shows a longitudinal section in a simplified representation by a control device 10, which consists essentially of two hydraulically unlockable check valves 11 and 12 and an associated hydraulically actuated unlocking piston 13 exists.
  • the control device 10 has a block-shaped housing 14 a continuous longitudinal bore 15 in the through annular extensions two internal valve chambers symmetrical to each other 16, 17 and two motor chambers 18, 19 adjoining them to the outside are trained.
  • each motor chamber 18, 19 there is a housing-fixed Valve seat 21 and 22 formed which the respective outer seat valve bodies 23 and 24 of the first and second check valve 11, 12 are assigned.
  • the two motor chambers 18, 19 protrude sloping channels in the housing 14 with motor connections 25 or 26 connected to which a double-acting hydraulic motor 27 is connected.
  • the two internal valve chambers 16, 17 are connected to valve connections 28 and 29, to which a conventional one 4/3-way valve 31 is connected.
  • the longitudinal bore 15 in the housing 14 is in the area between the two Valve seats 21, 22 are formed and have the same diameter a middle, delimited by the two valve chambers 16, 17, cylindrical section 32 in which the unlocking piston 13 with a cylindrical piston section 33 tight and slidably guided is.
  • the piston section 33 thus hydraulically separates the two Pressure medium connections from directional control valve 31 to engine 27.
  • Unlocking piston 13 three such guide webs 36 arranged in a star shape and are therefore evenly distributed along the circumference.
  • the boardwalks 36 have a cylindrical outer surface 37 with which they are guided in the bore section 37 and are supported there can.
  • a relatively deep annular groove 38 is in the guide webs 36th incorporated, whose inner diameter is about the core diameter of the Unlocking piston 13 is equal and their axial width about a third makes up the axial length of the guide webs 36.
  • the unlocking piston 13 then has a bolt-shaped on the guide webs 36 End 41, which builds relatively short and for mechanical unlocking the pilot operated check valve 11 is used.
  • the boardwalks 36 are thus in the immediate vicinity of the check valve 11 and form an additional guide for the end of the unlocking piston 13 within the bore section 34.
  • the axial length the guide webs 36 larger than the axial width of the first valve chamber 16 designed so that in each position of the unlocking piston 16 permanent guidance is maintained.
  • the unlocking piston 13 of the control device 10 is formed in one piece and symmetrical to its central piston section 33 built up so that corresponding to the first guide webs 36 on one end of the unlocking piston 13 at its opposite end Corresponding guide webs 42 are arranged in the second Bore section 35 are guided.
  • the unlocking piston 13 is thus stored a total of three times in the longitudinal bore 15.
  • control device 10 The operation of the control device 10 is explained as follows, the basic function of such a blocking block as known per se is assumed.
  • the free-floating unlocking piston becomes 13 of the closed check valves 11 and 12 in held in its middle position and the engine 27 by the as seat valves trained check valves 11, 12 shut off hydraulically safely.
  • the pressure medium over the second valve port 29 and the hydraulically opened second check valve 12 controlled to the motor 27, so acts in the second Valve chamber 17 building pressure on the unlocking piston 13 and pushes it to the left, based on figure 1.
  • the piloted first Check valve 11 mechanically unlocked so that pressure medium from the other side of the motor 27 via the first motor connection 25, the Check valve 11 and the first valve port 28 to the directional valve 31 and continue to flow to the tank.
  • FIG. 4 shows a front view of a second embodiment Unlocking piston 50, as in place of the one-piece unblocking piston 13 according to FIG. 2 can be used in the control device 10.
  • the guide webs 36 are in the same way formed while having a narrower piston portion 51.
  • the unlocking piston 50 thus represents one half of the one-piece Locking piston 13 shown in Figure 2.
  • Two derlocking pistons of this type 50 can with adjacent piston sections 51 in the housing 11 of the control device 10 are installed, so that these in works in the same way.
  • the two - part construction of the Unlocking piston 50 of Figure 4 has the advantage that it is much easier is producible and that this unlocking piston 50 also single-acting locking blocks can be used with only one single check valve work.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Check Valves (AREA)
  • Valve Device For Special Equipments (AREA)

Claims (11)

  1. Installation de commande hydraulique comportant au moins un clapet anti-retour (11, 12) à déverrouillage hydraulique, qui est branché dans la liaison entre un branchement de moteur (25, 26) servant au branchement d'un moteur (27) et un branchement de distributeur (28, 29) servant au branchement d'un distributeur à tiroir (31), et selon lequel :
    le clapet anti-retour (11, 12) en forme de soupape à siège et un piston de déverrouillage associé (13, 50) de commande hydraulique, sont logés coaxialement dans un alésage (15) du boítier (14),
    le piston de déverrouillage (13, 50) est guidé en coulissement de manière étanche avec un segment de piston (33, 51) dans un segment cylindrique (32) de l'alésage (15), et sépare une chambre (16, 17) hydrauliquement d'une seconde chambre (17, 16),
    une extrémité en forme de goujon (41) est réalisée sur le piston de déverrouillage (13, 50) pour déverrouiller mécaniquement le clapet anti-retour (11, 12) lorsque le piston de déverrouillage (13, 50) est sollicité par une pression dans la seconde chambre à soupape (17, 16) au niveau de son côté opposé au clapet anti-retour (11, 12), et
    un segment d'alésage (34, 35) cylindrique ayant le siège de soupape (21, 22) associé au clapet anti-retour (11, 12) est réalisé dans l'alésage (15) entre une chambre de moteur (18, 19) reliée au branchement de moteur (25, 26) et la chambre à soupape (16, 17) associée,
    caractérisée en ce que
    le piston de déverrouillage (13, 50) comporte à son extrémité (41) opposée au segment de piston (33, 51), des branches de guidage (36, 42) par lesquelles il est guidé en coulissement axial dans le segment d'alésage cylindrique (34, 35), et qui forment une section de passage (39) assurant une liaison pratiquement non étranglée pour le fluide sous pression entre la chambre de moteur (18, 19) et la chambre de soupape (16, 17) associée.
  2. Installation de commande selon la revendication 1,
    caractérisée en ce que
    le piston de déverrouillage (13, 50) comporte, à son extrémité, plusieurs branches et notamment trois branches de guidage (36, 42) réparties en étoile, dont les surfaces enveloppes cylindriques extérieures (37) sont guidées dans le segment de perçage cylindrique (34, 35).
  3. Installation de commande selon la revendication 1 ou 2,
    caractérisée en ce que
    les branches de guidage (36, 42) sont subdivisées par une rainure annulaire (38) dont le diamètre intérieur correspond sensiblement au diamètre du noyau du piston de déverrouillage (13, 50), et en ce que notamment sa largeur axiale correspond sensiblement à un tiers de la longueur axiale d'une branche de guidage (36, 42).
  4. Installation de commande selon l'une des revendications 1 à 3, selon laquelle les chambres de moteur et les chambres de soupape sont réalisées par des extensions radiales dans l'alésage,
    caractérisée en ce que
    la longueur axiale des branches de guidage (36, 42) est supérieure à la largeur axiale de la chambre de soupape (16, 17).
  5. Installation de commande selon l'une ou plusieurs des revendications 1 à 4,
    caractérisée en ce que
    dans la zone de l'extension axiale du piston de déverrouillage (13, 50) jusqu'au siège de soupape (21, 22) du côté du boítier, l'alésage longitudinal (15) présente le même grand diamètre.
  6. Installation de commande selon l'une des revendications 1 à 5,
    caractérisée en ce que
    le clapet anti-retour (11, 12) est un clapet à commande préalable.
  7. Installation de commande selon l'une ou plusieurs des revendications 1 à 6,
    caractérisée en ce que
    la distance entre le corps de soupape (23) d'un clapet anti-retour (11) et les branches de guidage (36) correspondantes est beaucoup plus petite que l'extension axiale du segment de perçage cylindrique (34), et correspond sensiblement à la longueur de l'extrémité (41) en forme de goujon.
  8. Installation de commande selon l'une ou plusieurs des revendications 1 à 7,
    caractérisée en ce qu'
    elle est réalisée sous la forme d'un élément de blocage (10) à double effet avec deux clapets anti-retour (11, 12) et un piston de déverrouillage (13, 50) associé à ces clapets.
  9. Installation de commande selon la revendication 8,
    caractérisée en ce que
    le piston de déverrouillage (13) comporte à ses deux extrémités (41), chaque fois des branches de guidage (36, 42) réalisées en une seule pièce.
  10. Installation de commande selon la revendication 8,
    caractérisée en ce que
    le piston de déverrouillage est réalisé en deux parties et se compose de deux moitiés de construction (50) dont chacune comporte un collet de piston (51) guidé dans le segment cylindrique central (32).
  11. Installation de commande selon l'une ou plusieurs des revendications 1 à 7,
    caractérisée en ce qu'
    elle est formée comme un élément de blocage à simple effet avec seulement un clapet anti-retour et un piston de déverrouillage (50).
EP94102873A 1993-03-18 1994-02-25 Dispositif hydraulique de commande avec au moins un clapet anti-retour piloté Expired - Lifetime EP0618372B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9303988U 1993-03-18
DE9303988U DE9303988U1 (de) 1993-03-18 1993-03-18 Hydraulische Steuereinrichtung mit mindestens einem hydraulisch entsperrbaren Rückschlagventil

Publications (3)

Publication Number Publication Date
EP0618372A2 EP0618372A2 (fr) 1994-10-05
EP0618372A3 EP0618372A3 (fr) 1995-03-01
EP0618372B1 true EP0618372B1 (fr) 1998-10-07

Family

ID=6890805

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102873A Expired - Lifetime EP0618372B1 (fr) 1993-03-18 1994-02-25 Dispositif hydraulique de commande avec au moins un clapet anti-retour piloté

Country Status (2)

Country Link
EP (1) EP0618372B1 (fr)
DE (2) DE9303988U1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19646428B4 (de) * 1996-11-11 2007-04-19 Bosch Rexroth Aktiengesellschaft Ventilanordnung
DE10334056A1 (de) * 2003-07-25 2005-02-10 Bosch Rexroth Ag Wegeventil
CN104533873A (zh) * 2015-01-05 2015-04-22 江苏真绩机械制造有限公司 双向自锁液压缸

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4461314A (en) * 1982-09-13 1984-07-24 Deere & Company Electrohydraulic valve

Also Published As

Publication number Publication date
DE9303988U1 (de) 1994-07-21
EP0618372A2 (fr) 1994-10-05
DE59407027D1 (de) 1998-11-12
EP0618372A3 (fr) 1995-03-01

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