EP0143238A1 - Cylindre d'actionnement à trois positions - Google Patents

Cylindre d'actionnement à trois positions Download PDF

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Publication number
EP0143238A1
EP0143238A1 EP84111140A EP84111140A EP0143238A1 EP 0143238 A1 EP0143238 A1 EP 0143238A1 EP 84111140 A EP84111140 A EP 84111140A EP 84111140 A EP84111140 A EP 84111140A EP 0143238 A1 EP0143238 A1 EP 0143238A1
Authority
EP
European Patent Office
Prior art keywords
piston
pressure medium
medium chamber
pressure
space
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
EP84111140A
Other languages
German (de)
English (en)
Other versions
EP0143238B1 (fr
Inventor
K.-H. Brinkmann
Alfred Klatt
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6212210&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0143238(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Wabco Westinghouse Fahrzeugbremsen GmbH filed Critical Wabco Westinghouse Fahrzeugbremsen GmbH
Priority to AT84111140T priority Critical patent/ATE28763T1/de
Publication of EP0143238A1 publication Critical patent/EP0143238A1/fr
Application granted granted Critical
Publication of EP0143238B1 publication Critical patent/EP0143238B1/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
    • F15B11/006—Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link
    • 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-AS 15 76 175.
  • 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 against one gradation of the cylinder housing which fixes the middle position is movable.
  • Such a breathing hole has the disadvantage that moisture and dirt can penetrate into the cylinder. If you were to think of preventing the ingress of moisture and dirt by arranging a check valve which can be brought into the open position to the atmosphere in or at the outlet of the breathing bore, the disadvantage of vacuum formation would still remain.
  • the invention has for its object to provide a cylinder of the type mentioned, which allows ventilation of the space delimited by the two pistons with simple means without the aforementioned disadvantages have to be accepted.
  • the invention offers in particular the advantage of connecting the one delimited by the two pistons Room with the valve devices for venting the two pressure medium chambers of the cylinder to obtain a ventilation system for all chambers of the working cylinder, which prevents the cylinder chamber from becoming dirty and enables the use of this cylinder even in damp and dusty locations.
  • Another advantage of the invention is to be seen in the fact that with appropriate dimensioning of the outlet valve for the space delimited by the two pistons and appropriate design of the connecting lines and the piston active surfaces, the piston movement in the direction of the space not to be acted upon by the pressure medium from the pressure the room to be ventilated is supported.
  • the illustration shows a working cylinder with three positions on average.
  • a first piston 15, 16 provided with a piston rod 53 is displaceably arranged.
  • the first piston 15, 16 divides the cylinder into a first pressure medium chamber 3 on the piston rod side and a second pressure medium chamber 17 located on the other side of the piston 15, 16 with respect to the first pressure medium chamber 3.
  • the two pressure medium chambers 3 and 17 are each connected via a pressure medium connection 50 or 18 and a valve device to be explained in more detail below ventable.
  • the first piston 15, 16 has on its side facing the second pressure medium chamber 17 a spherical guide 15.
  • a groove ring 13 is supported in a groove 14, 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, 16 serving as a stop 12.
  • the groove ring 13 seals the second pressure medium chamber 17 against the first pressure medium chamber 3.
  • a second piston 8 designed as an annular piston is arranged so as to be displaceable relative to the first piston 15, 16.
  • the second piston 8 has a radially outwardly extending circumferential projection 7, with which the second piston 8 can be brought into contact with a stop 47 fixed to the housing during a movement in the direction of the second pressure medium chamber 17.
  • the stop 47 fixed to the housing is formed by a gradation of the cylinder 4 and serves to fix the two pistons 15, 16, 8 in the central position.
  • a groove ring 6 is supported in a groove 5 of the second piston 8, the flanks of which are formed on the one hand by the projection 7 and on the other hand by a further circumferential projection 54, which is provided on the side of the second piston 8 facing the first pressure medium chamber 3.
  • the groove ring 6 seals the first pressure medium chamber 3 against the second pressure medium chamber 17.
  • an additional sealing ring 48 is arranged between the outer surface of the first piston 15, 16 and the inner wall of the second piston 8.
  • the additional designed as a grooved ring
  • sealing ring 48 is mounted in a groove 49 provided in the lateral surface of the first piston 15, 16, which is provided in the end region of the first piston 15, 16 facing the first pressure medium chamber 3.
  • the second piston 8 has a preferably circumferential projection 9, 10, 11, which extends radially inwards in the direction of the lateral surface of the first piston 15, 16. The projection serves as a stop which, when the two pistons 15, 16, 8 move away from one another, can be brought into contact with the sealing ring 48 arranged between the two pistons 15, 16, 8 on the first piston 15, 16.
  • the stop 9, 10, 11 has a steep edge 9 on its side facing the sealing ring 48 and a ramp-shaped bevel 11 on its side facing away from the sealing ring 48.
  • a recess 52 is provided in the cover 1 of the cylinder 4, through which the piston rod 53 is guided out of the cylinder 4.
  • a sealing ring 51 which is mounted in a groove arranged in the wall of the recess 52 and bears sealingly on the piston rod 53, prevents pressure medium from escaping from the first pressure medium chamber 3 through the recess 52 to the atmosphere.
  • a pressure medium connection 40 is provided on the cylinder housing 4, which is connected on the one hand via a supply line 38 to a pressure medium source 39 and on the other hand to a channel arranged in the cylinder bottom and serving as a pressure medium distributor 37.
  • the pressure medium distributor 37 has a first outlet 36 and a second outlet 20.
  • the first exit is 36 Via a pressure medium line 35 connected to the input of a first inlet valve 28, the output of which is connected via a pressure medium line 34 to the pressure medium connection 50 assigned to the first pressure medium chamber 3.
  • a pressure medium line 33 branching off from the pressure medium line 34 leads to the input of a first outlet valve 30, the output of which is connected via a pressure medium line 32 and a pressure medium connection 55 to the intermediate space 41 delimited by the two pistons 15, 16, 8.
  • the inlet valve 28 and the outlet valve 30 are designed as electromagnetic valves.
  • the electromagnetic valves 28, 30 can be connected to a voltage source via electrical lines 27, 29 and a switching device (not shown).
  • the second outlet 20 of the pressure medium distributor 37 is connected to the inlet of a second inlet valve 23 via a pressure medium line 21.
  • the outlet of the second inlet valve 23 is connected via a pressure medium line 19 to the pressure medium connection 18 assigned to the second pressure medium chamber 17.
  • Via a pressure medium line 26, which branches off from the pressure medium line 19, the pressure medium connection 18 is connected to the input of a second outlet valve 24, the output of which via a pressure medium line 32 and the pressure medium connection 55 with the intermediate space 41 in delimited by the two pistons 8, 15, 16 Connection is established.
  • the inlet valve 23 and the outlet valve 24 are designed as electromagnetic valves which can be connected to a voltage source via electrical lines 22, 25 and the switching device (not shown).
  • each pressure medium chamber can be assigned a valve device designed as a three / two-way valve.
  • the one of the two Piston 15, 16, 8 limited space 41 can be connected to the atmosphere via a third valve device designed as a check valve 42, 43.
  • the check valve 42, 43 is formed by a rubber plate 43 and a housing projection which delimits a housing recess 45 and is designed as a valve seat 42, the rubber plate 42 being fastened to a projection of the cylinder by means of a screw 46.
  • the retaining force of the check valve 42, 43 can be adjusted by means of the screw 46.
  • the check valve 42, 43 is protected against external influences by a cap 44, which is also held by the screw 46.
  • first piston 15, 16 connected to the piston rod 53 has assumed the central position. Pressure is present in the first pressure medium chamber 3 and in the second pressure medium chamber 17 via the opened inlet valves 28, 23 and the pressure medium connections 50, 18. The pressures in the two pressure medium chambers 3, 17 are the same.
  • the second piston 8 is pressed against the stop 47 fixed to the housing and remains at rest.
  • the first piston 15, 16 is pressed with its stop 12 against the second piston 8. Since the sum of the active surfaces of the two pistons 15, 16, 8 acted upon by the pressure from the first pressure medium chamber 3 is greater than the opposite active surface of the first piston 15, 16 acted upon by the pressure from the second pressure medium chamber 17, the first piston connected to the piston rod 53 remains 15, 16 in the middle position.
  • the inlet valve 28 assigned to the first pressure medium chamber 3 is closed and the outlet valve 30 assigned to the first pressure medium chamber 3 is brought into the open position.
  • the first piston 15, 16 is shifted to the left by the pressure from the second pressure medium chamber 17 and takes the second piston 8 with it with its stop 12.
  • the first pressure medium chamber 3 is vented via the pressure medium lines 34, 33, the opened first outlet valve 30 and the pressure medium line 32 into the recess 45 closed by the check valve 42, 43 and the adjoining space 41 delimited by the two pistons 8, 15, 16 . If the pressure in the intermediate space 41 and in the recess 45 has risen so far that it overcomes the retaining force of the check valve 42, 43, the check valve 42, 43 opens and the excess pressure is released to the atmosphere.
  • first piston 15, 16 is brought into its right end position and thus the piston rod 53 is moved into the cylinder 4, the first inlet valve 28, the second inlet valve 23, the first outlet valve 30 and the second outlet valve 24 are switched over.
  • the first inlet valve 28 is now in the open position and the first outlet valve 30 is closed.
  • the second inlet valve 23 assigned to the second pressure medium chamber 17 is now closed and the second outlet valve 24 assigned to the second pressure medium chamber 17 is now in the open position.
  • the pressure building up in the first pressure medium chamber 3 displaces the first piston 15, 16 and the second Piston 8 to the right in the direction of the second pressure medium chamber 17.
  • the second piston 8 comes to rest with its projection 7 on the stop 47 fixed to the housing and the first piston 15, 16 continues to its right end position.
  • the second pressure medium chamber 17 is via the pressure medium lines 19, 26, the opened outlet valve 24 and the pressure medium line 32 into the recess 45 closed by the check valve 42, 43 and the adjoining space 41 delimited by the two pistons 15, 16, 8 vented into it.
  • the second outlet valve 24 is closed, the second inlet valve 23 is brought into the open position and the second pressure medium chamber 17 is thus vented again.
  • the first piston 15, 16 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 3 until it comes to rest with its stop 12 on the end face of the second piston 8 facing it.
  • the pressure in the space 41 and the recess 45 delimited by the two pistons 15, 16, 8 is reduced to the atmosphere via the check valve 42, 43.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Actuator (AREA)
  • Fluid-Driven Valves (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Damping Devices (AREA)
EP84111140A 1983-10-19 1984-09-19 Cylindre d'actionnement à trois positions Expired EP0143238B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84111140T ATE28763T1 (de) 1983-10-19 1984-09-19 Arbeitszylinder mit drei stellungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3337969 1983-10-19
DE19833337969 DE3337969A1 (de) 1983-10-19 1983-10-19 Arbeitszylinder mit drei stellungen

Publications (2)

Publication Number Publication Date
EP0143238A1 true EP0143238A1 (fr) 1985-06-05
EP0143238B1 EP0143238B1 (fr) 1987-08-05

Family

ID=6212210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111140A Expired EP0143238B1 (fr) 1983-10-19 1984-09-19 Cylindre d'actionnement à trois positions

Country Status (3)

Country Link
EP (1) EP0143238B1 (fr)
AT (1) ATE28763T1 (fr)
DE (2) DE3337969A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2290263A3 (fr) * 2009-08-31 2011-04-13 ZF Friedrichshafen AG Procédé de synchronisation, servomoteur et dispositif de couplage doté d'un servomoteur
WO2017137321A1 (fr) * 2016-02-11 2017-08-17 Voith Patent Gmbh Dispositif de changement de vitesse pour une transmission

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9622893D0 (en) * 1996-11-02 1997-01-08 Lucas Ind Plc Piston actuator
AT407661B (de) * 1998-08-04 2001-05-25 Hygrama Ag Druckmittelzylinder, weichenventil und druckmittelbetätigte arbeitseinheit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR830896A (fr) * 1937-01-14 1938-08-11 Bolinder Munktell Dispositif de commande hydraulique des organes inverseurs de marche des moteurs, et en particulier des moteurs de bateau
US2604878A (en) * 1948-01-03 1952-07-29 Westinghouse Air Brake Co Fluid pressure motor
DE1576175B1 (de) * 1966-11-15 1971-12-23 Barkas Werke Veb Druckmittelbetaetigter Arbeitszylinder mit zweiseitiger Beaufschlagung,insbesondere fuer die Schaltung von Getrieben fuer Motorfahrzeuge

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE8105898U1 (de) * 1981-03-02 1982-04-08 Leibfried Maschinenbau Gmbh, 7033 Herrenberg Kolben-Zylinder-Aggregat
HU187364B (en) * 1981-04-16 1985-12-28 Autoipari Kutato Intezet Pneumatic three-position working cylinder particularly for stageslector mechanism of motor vehicle
HU187363B (en) * 1981-04-16 1985-12-28 Autoipari Kutato Intezet Pneumatic working cylinder woth four piston particularly for stage selector mechanism of motor vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR830896A (fr) * 1937-01-14 1938-08-11 Bolinder Munktell Dispositif de commande hydraulique des organes inverseurs de marche des moteurs, et en particulier des moteurs de bateau
US2604878A (en) * 1948-01-03 1952-07-29 Westinghouse Air Brake Co Fluid pressure motor
DE1576175B1 (de) * 1966-11-15 1971-12-23 Barkas Werke Veb Druckmittelbetaetigter Arbeitszylinder mit zweiseitiger Beaufschlagung,insbesondere fuer die Schaltung von Getrieben fuer Motorfahrzeuge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2290263A3 (fr) * 2009-08-31 2011-04-13 ZF Friedrichshafen AG Procédé de synchronisation, servomoteur et dispositif de couplage doté d'un servomoteur
WO2017137321A1 (fr) * 2016-02-11 2017-08-17 Voith Patent Gmbh Dispositif de changement de vitesse pour une transmission

Also Published As

Publication number Publication date
EP0143238B1 (fr) 1987-08-05
ATE28763T1 (de) 1987-08-15
DE3337969A1 (de) 1985-05-02
DE3337969C2 (fr) 1992-07-16
DE3465210D1 (en) 1987-09-10

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