EP0141106B1 - Cylindre de travail à trois positions - Google Patents

Cylindre de travail à trois positions Download PDF

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Publication number
EP0141106B1
EP0141106B1 EP84109969A EP84109969A EP0141106B1 EP 0141106 B1 EP0141106 B1 EP 0141106B1 EP 84109969 A EP84109969 A EP 84109969A EP 84109969 A EP84109969 A EP 84109969A EP 0141106 B1 EP0141106 B1 EP 0141106B1
Authority
EP
European Patent Office
Prior art keywords
piston
seal
pistons
stop
working 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.)
Expired
Application number
EP84109969A
Other languages
German (de)
English (en)
Other versions
EP0141106A2 (fr
EP0141106A3 (en
Inventor
Alfred Ing.-Grad. Klatt
Karlheinz Brinkmann
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.)
Wabco Westinghouse Fahrzeugbremsen GmbH
Original Assignee
Wabco Westinghouse Fahrzeugbremsen 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 Wabco Westinghouse Fahrzeugbremsen GmbH filed Critical Wabco Westinghouse Fahrzeugbremsen GmbH
Priority to AT84109969T priority Critical patent/ATE26328T1/de
Publication of EP0141106A2 publication Critical patent/EP0141106A2/fr
Publication of EP0141106A3 publication Critical patent/EP0141106A3/de
Application granted granted Critical
Publication of EP0141106B1 publication Critical patent/EP0141106B1/fr
Expired 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/12—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action
    • F15B11/121—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions
    • F15B11/123—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor providing distinct intermediate positions; with step-by-step action providing distinct intermediate positions by means of actuators with fluid-operated stops

Definitions

  • the invention relates to a working cylinder with three positions according to the preamble of claim 1.
  • Such a working cylinder is known from DE-A-3 107 908.
  • a first piston provided with a piston rod, which divides the cylinder into a first pressure medium chamber on the piston rod side and a second pressure medium chamber arranged on the other side of the piston with respect to the first pressure medium chamber.
  • a second piston designed as an annular piston is arranged such that it can be moved and sealed.
  • the second piston is movable against a gradation of the cylinder housing that fixes the central position.
  • Two stops are provided on the first piston which serve to limit the relative movement between the two pistons in that the second piston can be moved between them relative to the first piston.
  • the outer stop arranged in the end region of the first piston prevents the second piston from detaching from the first piston when the first piston is actuated by means of the piston rod when the cylinder is depressurized.
  • This stop like the other stop, is designed as a circlip. This means that when assembling the known working cylinder, the ring piston must first be pushed onto the first piston and then the circlip must be attached for the abovementioned stop.
  • the invention has for its object to provide a cylinder of the type mentioned, in which the assembly is simplified.
  • the invention has the particular advantage that when the working cylinder is assembled, the two pistons are connected by simply pushing the second piston onto the first piston, a projection arranged on the second piston being a snap connection over the one arranged on the first piston as a stop serving sealing element is guided.
  • the expenditure on components and labor is reduced, since the stop and the sealing element consist of a single component and it is therefore no longer necessary to incorporate an additional groove into the piston for receiving a retaining ring serving as a stop. For this reason, no special tools for heating a circlip are required.
  • the two pistons cooperate telescopically and the two stops, which prevent the two pistons from unintentionally detaching from one another, are arranged between the outer surface of one piston and the inner wall of the other piston facing the outer surface, the overall length of the cylinder is reduced.
  • the illustration shows a working cylinder with three positions on average.
  • a first piston 18, 15 provided with a piston rod 3 is displaceably arranged in a cylinder 14, which is closed by a cover 25 with the interposition of a sealing ring 28, a first piston 18, 15 provided with a piston rod 3 is displaceably arranged.
  • the first piston 18, 15 divides the cylinder into a first pressure medium chamber 2 on the piston rod side and a second pressure medium chamber 17 located on the other side of the piston 18, 15 with respect to the first pressure medium chamber 2.
  • the two pressure medium chambers 2 and 17 are each connected via a pressure medium connection 24 or 16 and a valve device, not shown, can be aerated and vented.
  • the first piston 18, 15 has on its side facing the second pressure medium chamber 17 a spherical guide 15.
  • a seal designed as a groove ring 12 is mounted in a groove 13, the flanks of which are formed, on the one hand, by the spherical guide 15 and, on the other hand, by a circumferential projection of the piston 15, 18 serving as a stop 11, a seal designed as a groove ring 12 is mounted.
  • the groove ring 12 seals the second pressure medium chamber 17 against the first pressure medium chamber 2.
  • a second piston 7 designed as an annular piston is arranged so as to be displaceable relative to the first piston 15, 18.
  • the second piston 7 has a radially outwardly extending circumferential projection 6, with which the second piston 7 can be brought into contact with a stop 19 fixed to the housing during a movement in the direction of the second pressure medium chamber 17.
  • the stop 19 fixed to the housing is formed by a gradation of the cylinder 14 and serves to fix the two pistons 15, 18; 7 in the middle position.
  • the groove ring 5 seals the first pressure medium chamber 2 against the second pressure medium chamber 17 7.
  • an additional seal designed as a grooved ring 22 is arranged between the outer surface of the first piston 15, 18 and the inner wall of the second piston 7.
  • the second grooved ring 22 is supported in a groove 23 provided in the lateral surface of the first piston 15, 18, which is provided in the end region of the first piston 15, 18 facing the first pressure medium chamber 2.
  • the second piston 7 has a preferably circumferential projection 8, 9, 10, which extends radially inward in the direction of the lateral surface of the first piston 15, 18.
  • the projection serves as a stop, which cooperates with the stop arranged on the first piston 15, 18 and formed by the sealing ring 22.
  • the stop 8, 9, 10 has on its side facing the sealing ring 22 a steep edge 8 and on its side facing away from the sealing ring 22 has a ramp-shaped bevel 10.
  • a recess 27 is provided in the cover 25 of the cylinder 14, through which the piston rod 3 is guided out of the cylinder 14.
  • a sealing ring 26, which is mounted in a groove arranged in the wall of the recess 27 and bears sealingly against the piston rod 3, prevents pressure medium from escaping from the first pressure medium chamber 2 through the recess 27 to the atmosphere.
  • the space between the two pistons 15, 18; 7 is connected to the atmosphere via a breathing hole 20.
  • the second piston 7, which is designed as an annular piston, is pushed onto the first piston 15, 18 from the piston rod end of the first piston 15, 18.
  • the groove ring 22 is elastically deformed by the stop 8, 9, 10 of the second piston 7. If the stop 8, 9, 10 has run over the grooved ring 22, the grooved ring 22 regains its original shape.
  • the second piston 7 can be pushed onto the first piston 15, 18 without the use of special tools, since the stop 8, 9, 10 arranged on the second piston 7 has a ramp-shaped bevel 10 which, when the second piston 7 is pushed onto the first piston 15, 18 deformed the ring nut 22 in a manner that is gentle on the material. Separation of the two pistons 7; 15, 18 is only possible without the use of special tools if damage to the grooved ring 22 is accepted, since the side of the stop 8, 9, 10 facing the grooved ring after assembly is designed as a steep edge 8.
  • the function of the working cylinder described above is explained in more detail below. It is assumed that the first piston 15, 18 connected to the piston rod 3, as shown in the figure, has assumed the central position. Pressure is present in the first pressure medium chamber 2 and in the second pressure medium chamber 17 via the pressure medium connections 24, 16. The pressures in the two pressure medium chambers 2, 17 are the same. The second piston 7 is pressed against the stop 19 fixed to the housing and remains at rest. The first piston 15, 18 is pressed with its stop 11 against the second piston 7. Since the sum of the effective surfaces of the two pistons 15, 18; 7 is larger than the opposing active surface of the first piston 15, 18 which is acted upon by the pressure from the second pressure medium chamber 17, the first piston 15, 18 connected to the piston rod 3 remains in the central position.
  • the first piston 15, 18 connected to the piston rod 3 is to be brought into its left end position, the first pressure medium chamber 2 is vented.
  • the first piston 15, 18 is shifted to the left by the pressure from the second pressure medium chamber 17 and takes the second piston 7 with it with its stop 11.
  • first piston 15, 18 is to be brought into its right end position and the piston rod 3 is to be moved into the cylinder 14, the second pressure medium chamber 17 is vented and the first pressure medium chamber 2 is vented. Both the first piston 15, 18 and the second piston 7 are moved toward the second pressure medium chamber 17 by the pressure from the first pressure medium chamber 2. The second piston 7 comes to rest with its projection 6 on the stop 19 fixed to the housing and the first piston 15, 18 continues to its right end position.
  • the second pressure medium chamber 17 is again pressurized.
  • the first piston 15, 18 is moved by the pressure medium from the second pressure medium chamber 17 to the left in the direction of the first pressure medium chamber 2 until it comes to rest with its stop 11 on the end face of the second piston 7 facing it.
  • first piston 15, 18 and the second piston 7 are in their left end position and the first piston 15, 18 is moved to the right in the direction of the second pressure medium chamber 17 by means of the piston rod 3 when the cylinder is depressurized, the first piston 15 comes , 18 with its grooved ring 22 against the steep edge 8 of the stop 8, 9, 10 arranged on the second piston 7 and takes the second piston 7 with it.
  • An unintentional separation of the two pistons 15, 18; 7 is therefore excluded, so that the function is ensured when the working cylinder is put into operation again.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
  • Harvester Elements (AREA)

Claims (6)

1. Vérin à trois positions présentant les particularités suivantes:
a) un premier piston (15, 18) muni d'un organe d'actionnement (3) est prévu et guidé avec étanchéité dans le cylindre (14);
b) un second piston (7) est prévu sous forme de piston annulaire, guidé avec étanchéité par rapport à la paroi intérieure du cylindre et à une face enveloppe extérieure du premier piston (15, 18);
c) une butée (19) solidaire du corps et prévue pour limiter la course du second piston (7);
d) pour limiter le mouvement relatif du premier piston (15, 18) et du second piston (7), ces derniers comportent pour chaque sens de déplacement une butée (11, 12) interagissant avec une autre butée correspondante (8, 9, 10) de l'autre piston, et caractérisé en ce que:
e) une des butées est constituée par un joint d'étanchéité (22) disposé entre les deux pistons (1 5, 18; 7); et
f) la seconde butée (8, 9, 10) interagissant avec le joint d'étanchéité (22) pour limiter le mouvement relatif des deux pistons (15, 18; 7) est réalisée de façon à se déplacer sur le joint d'étanchéité (22) à la façon d'un encliquetage rapide lors de l'assemblage des deux pistons (15, 18; 7).
2. Vérin selon la revendication 1, caractérisé en ce que la seconde butée (8, 9, 10) interagissant avec le joint d'étanchéité (22) pour limiter le mouvement relatif des deux pistons (15, 18; 7) est réalisée sous forme d'une saillie circulaire dont le côté en regard du joint d'étanchéité (22) présente un bord (28) à forte pente et le côté opposé au joint d'étanchéité (22) présente un biseau (10) en forme de rampe.
3. Vérin selon la revendication 1, caractérisé en ce que le joint d'étanchéité (22) est réalisée sous forme de joint en U à lèvres.
4. Vérin selon une quelconque des revendications 1 à 3, caractérisé en ce que:
a) la butée constituée par le joint d'étanchéité (22) est disposée sur la face enveloppe du premier piston (15, 18); et
b) la seconde butée (8, 9, 10) interagissant avec le joint d'étanchéité (22) pour limiter le mouvement relatif des deux pistons ( 15, 18; 7) est disposée sur la paroi intérieure du second piston (7) en regard du premier piston (15, 18).
5. Vérin selon la revendication 1, caractérisé en ce que la seconde butée interagissant avec le joint d'étanchéité (22) pour limiter le mouvement relatif des deux pistons (15, 18; 7) est constituée par un élément élastique au moins.
6. Vérin selon la revendication 1, caractérisé en ce que la seconde butée interagissant avec le joint d'étanchéité (22) pour limiter le mouvement relatif des deux pistons (15, 18; 7) est montée élastiquement.
EP84109969A 1983-10-08 1984-08-22 Cylindre de travail à trois positions Expired EP0141106B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84109969T ATE26328T1 (de) 1983-10-08 1984-08-22 Arbeitszylinder mit drei stellungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3336682 1983-10-08
DE19833336682 DE3336682A1 (de) 1983-10-08 1983-10-08 Arbeitszylinder mit drei stellungen

Publications (3)

Publication Number Publication Date
EP0141106A2 EP0141106A2 (fr) 1985-05-15
EP0141106A3 EP0141106A3 (en) 1985-11-06
EP0141106B1 true EP0141106B1 (fr) 1987-04-01

Family

ID=6211367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84109969A Expired EP0141106B1 (fr) 1983-10-08 1984-08-22 Cylindre de travail à trois positions

Country Status (4)

Country Link
EP (1) EP0141106B1 (fr)
AT (1) ATE26328T1 (fr)
DE (2) DE3336682A1 (fr)
YU (1) YU44879B (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4128389A1 (de) * 1991-08-27 1993-03-04 Grau Gmbh Doppelt wirkender betaetigungszylinder
DE102009029038A1 (de) * 2009-08-31 2011-03-03 Zf Friedrichshafen Ag Verfahren zur Synchronisierung, Stellmotor und Schalteinrichtung mit Stellmotor
DE102010011239A1 (de) * 2010-03-12 2011-09-15 GM Global Technology Operations LLC , (n. d. Ges. d. Staates Delaware) Fluidische Betätigungsaktuatorik mit einem zweistückigen Zylindergehäuse und Verfahren zur Herstellung einer solchen Betätigungsaktuatorik
EP3744675A1 (fr) 2014-10-17 2020-12-02 Vehicle Service Group, LLC Synchroniseur hydraulique
DE102020212525A1 (de) 2020-10-05 2022-04-07 Zf Friedrichshafen Ag Stellzylinder mit drei Stellpositionen und radial ineinander liegenden Druckräumen

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1576175B1 (de) * 1966-11-15 1971-12-23 Barkas Werke Veb Druckmittelbetaetigter Arbeitszylinder mit zweiseitiger Beaufschlagung,insbesondere fuer die Schaltung von Getrieben fuer Motorfahrzeuge
US3433132A (en) * 1966-11-28 1969-03-18 F & E Mfg Co Vacuum motor
CS151966B1 (fr) * 1970-07-10 1973-12-19
DE2318757A1 (de) * 1973-03-01 1974-09-19 Louis Mayer Zum aufbringen auf strassen bestimmtes lichtreflektierendes markierungselement
SE414527B (sv) * 1978-11-07 1980-08-04 Volvo Ab Cylinder med tvastegsrorelse, speciellt en svetscylinder
GB2042079B (en) * 1979-02-03 1983-01-12 Ford A T Stroke variation relay device
DE3107908A1 (de) * 1981-03-02 1982-09-16 Leibfried Maschinenbau Gmbh, 7033 Herrenberg Kolben-zylinder-aggregat
DE8105898U1 (de) * 1981-03-02 1982-04-08 Leibfried Maschinenbau Gmbh, 7033 Herrenberg Kolben-Zylinder-Aggregat
DE3212758A1 (de) * 1982-04-06 1983-10-06 Filmosto Projektion Rahmen, insbesondere wechselrahmen fuer fotografien

Also Published As

Publication number Publication date
YU161484A (en) 1990-06-30
DE3336682A1 (de) 1985-04-25
ATE26328T1 (de) 1987-04-15
EP0141106A2 (fr) 1985-05-15
YU44879B (en) 1991-04-30
EP0141106A3 (en) 1985-11-06
DE3462938D1 (en) 1987-05-07

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