EP0638731A1 - Entraînement linéaire pneumatique à verrouillage en position déployée - Google Patents

Entraînement linéaire pneumatique à verrouillage en position déployée Download PDF

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Publication number
EP0638731A1
EP0638731A1 EP94110397A EP94110397A EP0638731A1 EP 0638731 A1 EP0638731 A1 EP 0638731A1 EP 94110397 A EP94110397 A EP 94110397A EP 94110397 A EP94110397 A EP 94110397A EP 0638731 A1 EP0638731 A1 EP 0638731A1
Authority
EP
European Patent Office
Prior art keywords
piston
rod
valve
linear drive
locking link
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
EP94110397A
Other languages
German (de)
English (en)
Other versions
EP0638731B1 (fr
Inventor
Markus Dipl.-Ing. Horstmann
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.)
Airbus Defence and Space GmbH
Original Assignee
Deutsche Aerospace AG
Daimler Benz Aerospace AG
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 Deutsche Aerospace AG, Daimler Benz Aerospace AG filed Critical Deutsche Aerospace AG
Publication of EP0638731A1 publication Critical patent/EP0638731A1/fr
Application granted granted Critical
Publication of EP0638731B1 publication Critical patent/EP0638731B1/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
    • 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 linear drive with a single-acting, pneumatic piston / cylinder unit and with at least one spring which counteracts the pneumatic force and loads the piston rod in the direction of an end position.
  • a linear drive with all the generic features of the present invention is known from DE-PS 42 21 230.
  • the locking in both end positions of the drive is carried out by a pneumatically operated locking link that is movable transversely to the piston rod and can be snapped into a recess in the piston rod from diametrical sides.
  • a first, smaller control piston which is responsible for locking in the pneumatically inactive end position of the drive, is rigidly connected to the locking link.
  • a second, larger control piston is located on the opposite side of the piston rod and transmits its actuating force to the locking link in a spring-elastic manner. This is responsible for locking in the pneumatically active end position of the drive.
  • the piston / cylinder unit is also pneumatically actuated via a mostly open flow connection.
  • a valve device (valve piston, spring finger, throttle channel, etc.) is coupled to the second, larger control piston, which temporarily releases an additional flow cross section when the piston / cylinder unit is vented and thus increases the overall flow cross section. This allows the movement of the piston rod to be accelerated in one direction (from the pneumatically active to the inactive end position), or throttling effects can be compensated for by the cryogenic pressure medium (gap reduction, higher viscosity of the flow, etc.).
  • this linear drive is relatively compact, light, uncomplicated, reliable and suitable for the operating conditions in the vicinity of rocket engines.
  • the object of the invention is to provide a generic linear drive which is still more compact, simple, reliable and easy to maintain with at least largely the same functionality.
  • the locking link is actuated only by an actuating rod and by a double piston separating the two pressure chambers.
  • the force transmission from the double piston to the actuating rod is resilient in both directions, the forces also being at least largely the same in size.
  • the pneumatic system is on one side of the piston rod and is therefore more compact, easier, more reliable and easier to maintain.
  • the design and arrangement of the one-way flow control valve in the area between the locking link and the double piston also contributes to this.
  • the sub-claims 2 to 5 contain preferred embodiments of the linear drive according to claim 1.
  • the linear drive 1 is an essential component of a rocket fuel valve, not shown with regard to its other components, through which liquid hydrogen or liquid oxygen flows, for example.
  • the pressure medium to be used for the actuation must neither condense nor freeze at the extremely low fuel temperatures and should be inert in the event of possible contact with the fuel. These conditions are also met by the particularly low-weight gas helium.
  • the housing 2 encloses or carries both the elements required for the valve actuation, ie the piston / cylinder unit 3 and the spring 11, and the locking mechanism, ie in particular the Locking link 12, the actuating rod 13 and the double piston 20.
  • the locking and unlocking movement takes place vertically, the valve movement horizontally.
  • the valve cone and seat would be in the area of the left end of the piston rod.
  • the piston / cylinder unit 3 comprises in particular the cylinder 4, the piston 5, which is movably sealed in the cylinder 4 by means of a sealing ring 6, the piston rod 7 provided with two axially offset, diametrical recesses 8, 9 and the sliding bushing 10 which guides and seals the piston rod 7 .
  • the right end of the piston / cylinder unit 3 with cylinder cover, piston rod bushing, ventilation, etc. is not shown for the sake of simplicity. It is understood that the entire housing 2 in reality - for manufacturing and assembly reasons - consists of a large number of individual parts, seals, screw connections, centering, etc. In the figures, the housing 2 is shown as an integral block for the sake of clarity. The same also applies to other components, such as the actuating rod 13 and the double piston 20.
  • the essence of the invention is, of course, in the design and type of locking, including the pressure gas guide.
  • the locking link 12 which engages around the piston rod 7 or, for example as a perforated plate, surrounds on all sides, serves as a locking element, which snaps into the recesses 8, 9 of the piston rod 7.
  • the power transmission to the locking link 12 takes place via the actuating rod 13 which is firmly connected thereto and extends into the region of the double piston 20.
  • the double piston 20 converts the pneumatic pressure into a mechanical axial force and for this purpose extends into two pressure chambers 31 and 32 which can be ventilated and vented separately and which have openings 33, 34 leading to external connections (not shown).
  • the double piston 20 is provided with a cylindrical cavity 26, in which two bushings 28, 29 are axially displaceable to a limited extent, and which has an opening 27 for the actuating rod 13.
  • the bushings 28, 29 are held at a distance by a compression spring 30 and interact with a stop surface 14, 15 on the actuating rod 13.
  • the flow of force runs from the double piston via the first bushing, the compression spring and the second bushing to the stop surface on the actuating rod, the compression spring 30 forming the elastic link. This applies to downward and upward piston forces.
  • the double piston 20 is slidably sealed in the housing 2 by means of the seal 25, furthermore the seals 23, 24 are effective in its stop surfaces 21, 22 in their two end positions, which rest on elevations of the inner housing surface.
  • the lower pressure chamber 32 is permanently fluid-mechanically connected to the space on the left of the piston 5 inside the cylinder 4, but the available flow cross sections vary with time.
  • the opening 17 is molded into an exchangeable calibration insert 19 and can be varied in a targeted manner by exchanging the same.
  • Both the guidance of the locking link 12 in the housing 2 and the housing opening for the piston rod 7 are on the right of the locking link 12 designed to be gas permeable.
  • the opening 17 plunges into the guide bore of the valve piston 36 of the throttle check valve 35 in certain operating states.
  • there is a clearance fit here which is also not gas-tight. In the figures, this is indicated by a radial gap.
  • the guide bore of the valve piston 36 can also be designed in a targeted manner with grooves, grooves, etc. in the longitudinal direction.
  • the sliding bush 43 also does not enclose and guide the actuating rod 13 in a gastight manner.
  • the throttle check valve 35 has the task of temporarily increasing the flow cross section when venting the piston / cylinder unit 3. This state is shown in Fig. 3.
  • the valve piston 36 lifts against the force of the compression spring 38 from the seal 41 in the stop surface 40 until it abuts the stop surface 39 in the housing 2.
  • the pressure medium can thus flow rapidly through the flow gap 42 and through the passage openings 37 to the pressure chamber 32. If desired, this accelerates the closing of the fuel valve.
  • the effect is compensated that in the pneumatically active state of the piston / cylinder unit 3, the heat and capacity of the cryogenic pressure medium reduce the clearances and gaps and thus also the flow cross sections between the components, which would result in increased flow resistance, i.e. a slowed piston rod movement.
  • Fig. 1 shows the pneumatically active, locked end position.
  • the locking link 12 is located in the recess 9 of the piston rod 7 and would inadvertently close the pneumatic pressure in the event of failure Prevent fuel valves.
  • the pressurization of the lower pressure chamber 32 and thus of the piston 5 is indicated by a white arrow at the opening 34.
  • Fig. 2 shows an intermediate position in the transition movement from the active to the passive end position.
  • the piston movement is indicated by a black arrow.
  • the upper pressure chamber 31 is pressurized, the lower pressure chamber 32 and thus the piston / cylinder unit 3 are vented.
  • the pressure medium flowing back has opened the throttle check valve 35 and thus has additional flow cross sections (passage openings 37 etc.).
  • the locking link is under spring force (compression spring 30) from above on the piston rod 7 and dampens any vibrations that may occur. It can be seen that the lower bush 29 is displaced upwards in the double piston 20, but is not in contact with the upper bush 28, as a result of which the power transmission is still elastically flexible.
  • Fig. 3 shows the pneumatically passive, locked end position.
  • the locking link 12 is located in the recess 8 of the piston rod 7 and prevents unwanted opening of the fuel valve. Only the upper pressure chamber 31 is pressurized (see white arrow).

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Damping Devices (AREA)
EP94110397A 1993-07-16 1994-07-04 Entraînement linéaire pneumatique à verrouillage en position déployée Expired - Lifetime EP0638731B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4323846 1993-07-16
DE4323846A DE4323846C1 (de) 1993-07-16 1993-07-16 Pneumatischer Linearantrieb mit Endlagenverriegelung

Publications (2)

Publication Number Publication Date
EP0638731A1 true EP0638731A1 (fr) 1995-02-15
EP0638731B1 EP0638731B1 (fr) 1996-09-25

Family

ID=6492957

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94110397A Expired - Lifetime EP0638731B1 (fr) 1993-07-16 1994-07-04 Entraînement linéaire pneumatique à verrouillage en position déployée

Country Status (2)

Country Link
EP (1) EP0638731B1 (fr)
DE (2) DE4323846C1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013109184A1 (fr) * 2012-01-20 2013-07-25 Naf Ab Actionneur de soupape pneumatique et procédé de verrouillage d'un élément de fermeture de soupape par rapport à un corps de soupape
WO2013104707A3 (fr) * 2012-01-13 2013-09-06 Norgren Gmbh Réglage de position et verrouillage de position d'un actionneur commandé par fluide
CN112610562A (zh) * 2020-12-30 2021-04-06 三一海洋重工有限公司 油缸锁止装置和油缸

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2735539B1 (fr) * 1995-06-16 1997-08-22 Henri Berthier Verin a fluide sous pression a double effet comportant un verrouillage de la tige de son piston
DE19828199C2 (de) * 1998-06-25 2000-04-20 Daimler Chrysler Ag Absperrventil
DE19841631C2 (de) 1998-09-11 2002-02-28 Daimler Chrysler Ag Pneumatischer Linearantrieb für kryogene Steuerventile
DE102008022509A1 (de) * 2008-05-07 2009-11-12 Robert Bosch Gmbh Wegeventil mit einer Rastvorrichtung
CN102400973B (zh) * 2011-11-18 2015-07-08 北京市三一重机有限公司 一种液压油缸
CN103750658A (zh) * 2014-02-08 2014-04-30 北京北方车辆集团有限公司 一种电动斜抽拉式抽屉
DE102017126196A1 (de) 2017-11-09 2019-05-09 Arianegroup Gmbh Federunterstützter, verriegelbarer Linearantrieb und ein damit ausgestattetes Ventil
DE102022107278A1 (de) 2022-03-28 2023-09-28 Zf Cv Systems Europe Bv Aktuator eines automatisierten Schaltgetriebes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2130618A (en) * 1936-09-03 1938-09-20 Westinghouse Air Brake Co Fluid pressure motor and locking means therefor
US2908251A (en) * 1955-05-13 1959-10-13 Gratzmuller Jean Louis Single acting hydraulic motor
DE3913009A1 (de) * 1989-04-20 1990-10-25 Wolfgang Dipl Ing Niemann Pneumatik-zylinder mit endstellungs-verriegelung
DE4221230C1 (fr) * 1992-06-27 1993-07-08 Messerschmitt-Boelkow-Blohm Ag, 8012 Ottobrunn, De

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3609765A1 (de) * 1986-03-22 1987-09-24 Colt Int Holdings Druckmittelbetaetigbarer hubzylinder fuer vorzugsweise entlueftungseinrichtungen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2130618A (en) * 1936-09-03 1938-09-20 Westinghouse Air Brake Co Fluid pressure motor and locking means therefor
US2908251A (en) * 1955-05-13 1959-10-13 Gratzmuller Jean Louis Single acting hydraulic motor
DE3913009A1 (de) * 1989-04-20 1990-10-25 Wolfgang Dipl Ing Niemann Pneumatik-zylinder mit endstellungs-verriegelung
DE4221230C1 (fr) * 1992-06-27 1993-07-08 Messerschmitt-Boelkow-Blohm Ag, 8012 Ottobrunn, De

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013104707A3 (fr) * 2012-01-13 2013-09-06 Norgren Gmbh Réglage de position et verrouillage de position d'un actionneur commandé par fluide
WO2013109184A1 (fr) * 2012-01-20 2013-07-25 Naf Ab Actionneur de soupape pneumatique et procédé de verrouillage d'un élément de fermeture de soupape par rapport à un corps de soupape
US9746100B2 (en) 2012-01-20 2017-08-29 Naf Ab Pneumatically drivable valve actuator and method of locking a valve closure element relative to a valve body
CN112610562A (zh) * 2020-12-30 2021-04-06 三一海洋重工有限公司 油缸锁止装置和油缸
CN112610562B (zh) * 2020-12-30 2023-02-24 三一海洋重工有限公司 油缸锁止装置和油缸

Also Published As

Publication number Publication date
DE59400735D1 (de) 1996-10-31
DE4323846C1 (de) 1994-11-10
EP0638731B1 (fr) 1996-09-25

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