EP0143238B1 - Arbeitszylinder mit drei Stellungen - Google Patents

Arbeitszylinder mit drei Stellungen Download PDF

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Publication number
EP0143238B1
EP0143238B1 EP84111140A EP84111140A EP0143238B1 EP 0143238 B1 EP0143238 B1 EP 0143238B1 EP 84111140 A EP84111140 A EP 84111140A EP 84111140 A EP84111140 A EP 84111140A EP 0143238 B1 EP0143238 B1 EP 0143238B1
Authority
EP
European Patent Office
Prior art keywords
pressure
piston
space
pistons
medium chamber
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
EP84111140A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0143238A1 (de
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(B1) "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/de
Application granted granted Critical
Publication of EP0143238B1 publication Critical patent/EP0143238B1/de
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-B-1 576 175.
  • 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 movable against a gradation of the cylinder housing that fixes the central position.
  • Such a breathing hole has the disadvantage that moisture and dirt can penetrate into the cylinder. If one were to think of preventing the ingress of moisture and dirt by arranging a check valve which can be brought into the open position in the atmosphere 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 working cylinder of the type mentioned, which allows ventilation of the space delimited by the two pistons with simple means, without having to accept the aforementioned disadvantages.
  • the invention offers the advantage, in particular, that by connecting the space delimited by the two pistons to the valve devices serving to vent the two pressure medium chambers of the cylinder, a ventilation system is obtained for all chambers of the working cylinder, which prevents contamination of the cylinder space and the use thereof this cylinder is also possible in damp and dusty locations.
  • a further 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 16 provided with a piston rod 53 is displaceably arranged.
  • the first piston 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 16 with respect to the first pressure medium chamber 3.
  • the two pressure medium chambers 3 and 17 are each via a pressure medium connection 50 and 18 and another Valve device 23, 24, 28, 30 to be explained in more detail can be vented and vented.
  • the first piston 16 has a convex peripheral guide 15 on its side facing the second pressure medium chamber 17.
  • a groove ring 13 is mounted 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 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 displaceably relative to the first piston 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 16 and 8 in the central position.
  • 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, a groove ring 6 is agglomerated .
  • 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 16 and the inner wall of the second piston 8.
  • the additional sealing ring 48 designed as a groove ring is mounted in a groove 49 provided in the lateral surface of the first piston 16, which is provided in the end region of the first piston 16 facing the first pressure medium chamber 3.
  • the second piston 8 has a preferably circumferential projection 9, 10, 11, which extends radially inward in the direction of the lateral surface of the first piston 16. The projection serves as a stop which, when the two pistons 16 and 8 move away from one another, can be brought into contact with the sealing ring 48 arranged between the two pistons 16, 8 on the first piston 16.
  • the stop 9, 10, 11 has a steep edge 9 and on its side facing the sealing ring 48 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 output 36 is connected via a pressure medium line 35 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 outlet 31 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 16, 8.
  • the inlet valve 28 and the outlet valve 30 are designed as electromagnetic valves.
  • the electromagnetic solenoid 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 is connected via the pressure medium line 32 and the pressure medium connection 55 to the intermediate space 41 delimited by the two pistons 8 and 16 .
  • 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 space 41 delimited by the two pistons 16 and 8 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 4 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 16 connected to the piston rod 53 has assumed the central position, as shown in the figure. 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 16 is pressed with its stop 12 against the second piston 8. Since the sum of the active surfaces of the two pistons 16 and 8 acted upon by the pressure from the first pressure medium chamber 3 is greater than the opposite active surface of the first piston 16 acted upon by the pressure from the second pressure medium chamber 17, the first piston 16 connected to the piston rod 53 remains in the central 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 16 is displaced 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 and 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 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 moves the first piston 16 and the second piston 8 towards 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 16 continues to its right end position.
  • thei second pressure medium chamber 17 is vented 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 16 and 8.
  • 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 16 is displaced 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 delimited by the two pistons 16 and 8 and the recess 45 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 Arbeitszylinder mit drei Stellungen Expired EP0143238B1 (de)

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
DE19833337969 DE3337969A1 (de) 1983-10-19 1983-10-19 Arbeitszylinder mit drei stellungen
DE3337969 1983-10-19

Publications (2)

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

Family

ID=6212210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84111140A Expired EP0143238B1 (de) 1983-10-19 1984-09-19 Arbeitszylinder mit drei Stellungen

Country Status (3)

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

Families Citing this family (4)

* 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
DE102009029038A1 (de) * 2009-08-31 2011-03-03 Zf Friedrichshafen Ag Verfahren zur Synchronisierung, Stellmotor und Schalteinrichtung mit Stellmotor
DE102016202032A1 (de) * 2016-02-11 2017-08-17 Voith Patent Gmbh Schaltvorrichtung für ein Getriebe

Family Cites Families (8)

* 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
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
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
HU187364B (en) * 1981-04-16 1985-12-28 Autoipari Kutato Intezet Pneumatic three-position working cylinder particularly for stageslector mechanism of motor vehicle

Also Published As

Publication number Publication date
EP0143238A1 (de) 1985-06-05
ATE28763T1 (de) 1987-08-15
DE3337969A1 (de) 1985-05-02
DE3337969C2 (enrdf_load_stackoverflow) 1992-07-16
DE3465210D1 (en) 1987-09-10

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