EP2546531A2 - Dampened pyrotechnical actuator - Google Patents

Dampened pyrotechnical actuator Download PDF

Info

Publication number
EP2546531A2
EP2546531A2 EP12176373A EP12176373A EP2546531A2 EP 2546531 A2 EP2546531 A2 EP 2546531A2 EP 12176373 A EP12176373 A EP 12176373A EP 12176373 A EP12176373 A EP 12176373A EP 2546531 A2 EP2546531 A2 EP 2546531A2
Authority
EP
European Patent Office
Prior art keywords
piston
actuator
liquid
actuator according
housing
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.)
Withdrawn
Application number
EP12176373A
Other languages
German (de)
English (en)
Other versions
EP2546531A3 (fr
Inventor
Karl Bauer
Horst Böttger
Wulf-Dieter Pohl
Christoph Bauer
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.)
Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH
Original Assignee
Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH
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 Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH filed Critical Bayern Chemie Gesellschaft fuer Flugchemische Antriebe mbH
Publication of EP2546531A2 publication Critical patent/EP2546531A2/fr
Publication of EP2546531A3 publication Critical patent/EP2546531A3/fr
Withdrawn legal-status Critical Current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
    • F15B15/19—Pyrotechnical actuators
    • 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
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke

Definitions

  • the invention relates to a damped pyrotechnic actuator.
  • Pyrotechnic actuators are mainly used in automotive technology, airbags, belt tensioners, roll bars, in military technology in vehicles for operating door opening mechanisms and also in rocket technology for opening air inlets, for example, in the case of ramjet missiles.
  • pyrotechnic actuators are used where a one-time operation is required.
  • a pyrotechnic actuator has a pyrotechnic propellant charge, which releases a quantity of gas in the ignition in a very short time and shifts a piston by the pressure building up. The movement is usually transmitted to other mechanical components via the piston rod. Depending on the pressure of the gas or the cross-sectional area of the piston very large forces and or large piston speeds can be achieved.
  • a pyrotechnic actuator also has a very short response time and has a very high reliability. Pyrotechnic actuators often have the disadvantage that due to the high gas pressure, the piston speed is very high and this high speed mechanical components damaged. Therefore, it is often necessary to dampen the piston in its speed.
  • damped pyrotechnic actuators are known.
  • the known from the prior art pyrotechnic actuators have Kochströmbohrungen to reduce the gas flowing into the piston amount of gas and so to delay the movement of the piston.
  • These overflow holes have the disadvantage that they must be made accurately and the piston speed is mostly and undefined.
  • these actuators have a delayed response since it takes some time for the pressure of the gas to be high enough to displace the piston.
  • the invention has for its object to provide a pyrotechnic actuator available, which has a moderate piston speed and a quick response with a simple structure.
  • a damped pyrotechnic actuator which has an actuator housing in which at least one axially movable piston with piston rod arranged thereon is arranged.
  • the piston rod protrudes from the actuator housing at its end opposite the piston.
  • the piston is at least one within the Actuator housing arranged pressure-generating pyrotechnic propellant charge slidably.
  • the piston is held by a fixing system up to a predetermined pressure in a basic position.
  • the interior of the actuator housing is at least partially filled with a liquid on the opposite side of the pressure chamber of the piston. The liquid is held in the actuator housing by means of a closure. When the predetermined pressure is exceeded, the closure allows the liquid to flow out.
  • the piston is held by means of the fixing system in the starting position, the basic position to a defined, predetermined pressure. In this position, a preferably largely tight seal prevents the escape of the liquid.
  • the fixing system allows a displacement of the piston and the closure preferably opens at least a part of the cross-section which allows the fluid to flow out.
  • a preferred embodiment of the actuator is characterized in that the piston rod is guided by means of a guide in the actuator housing.
  • the guide forms at least together with a sealing element the closure.
  • the closure preferably prevents leakage of liquid in the initial position of the piston.
  • a further preferred embodiment of the actuator is characterized in that the piston rod has different cross-sectional areas in the region of the end opposite the piston. By the different ones Cross-sectional areas is formed at a displaced from the basic position piston at least one passage opening for the liquid. The at least one passage opening allows an overflow of the liquid.
  • the at least one passage opening for the liquid is dimensioned so that the liquid opposes the movement of the piston a resistance.
  • the resistance delays the movement of the piston.
  • the movement of the piston can be delayed.
  • a liquid oil or alcohol has been proven.
  • the size of the passage opening is variable depending on the movement of the piston.
  • the size of the passage opening during the movement of the piston and thus the piston rod can be changed. This causes the piston to move or decelerate faster or slower.
  • the liquid passes through the passage opening from the actuator housing to the outside in the environment.
  • the actuator has a further cavity in which the exiting liquid passes.
  • the passage opening is formed by at least one groove along the piston rod. Via the groove on the piston rod, the liquid can escape from the actuator housing to the outside.
  • a preferred embodiment of the actuator is characterized in that the interior of the actuator housing containing the liquid is at least partially filled with a gas.
  • the gas is air or a gas having a different gas composition.
  • the gas can compensate for temperature expansion of the liquid.
  • a preferred embodiment of the actuator is characterized in that the piston is held in its basic position by means of a mechanical, electrical or magnetic fixing system up to a predetermined pressure.
  • a particularly preferred embodiment of the actuator is characterized in that the fixing system comprises a shear washer or a shear pin.
  • the shear washer or the shear pin can be sheared off at a predetermined pressure.
  • a further preferred embodiment of the actuator is characterized in that a plurality of pistons are arranged in the actuator housing.
  • the pistons are driven by at least one or more common propellant charges.
  • the propellant is preferably in its own separate Chamber arranged.
  • the depression of the pistons is in this case preferably made possible via connecting bores.
  • FIG. 1 an embodiment of the pyrotechnic actuator 1 according to the invention is shown in a sectional view.
  • the actuator 1 has an actuator housing 2, in which a displaceable piston 3 is arranged.
  • the piston 3 is in its basic or initial position.
  • a piston rod 4 is arranged on the piston 3, arranged.
  • the piston rod 4 projects out of the actuator housing 2 at its end 41, which is opposite the piston 3.
  • the interior of the actuator housing 2 is partially filled with a liquid 7. Part of the interior is filled with a gas 9.
  • a pyrotechnic propellant charge 8 is arranged in the pressure chamber of the actuator housing 2.
  • the propellant charge 8 is activated via an igniter 81.
  • a quantity of gas is released, by means of which the piston 3 can be moved from its initial position into the end position.
  • the piston 3 is held in the initial position via the piston rod 4 on the actuator housing 2 by means of a fixing system 6, in the illustrated embodiment in the form of a shear washer.
  • the fixing system 6 prevents the piston 3 does not move from the starting position until reaching a defined, predetermined pressure. In this position, moreover, a preferably largely sealed closure 5 prevents liquid 7 from escaping from the actuator housing 2 in the region of the piston rod 4.
  • a gas 9 allows that after opening the fixing system 6, in the illustrated embodiment, after shearing the shear disc, the piston 3 in the axial Direction moves before the shutter 5 opens.
  • the shear disk is integrated into the guide 10 of the piston rod 4.
  • the closure 5 is formed by the guide 10 and a sealing element 11 arranged on the piston rod 4.
  • FIG. 2 is the actuator after FIG. 1 shown, in which the piston 3 is displaced from its normal position in the axial direction.
  • the piston 3 was through the Gas pressure shifted, which was generated by ignition of the pyrotechnic propellant charge 8.
  • the fixing system 6 is deactivated in the illustrated embodiment by shearing the shear plate, the piston 3 with the piston rod 4 is thus released in its movement.
  • the closure 5 with arranged sealing element 11 has released by displacement of the piston rod 4, a passage opening 12, from which the liquid 7 can escape.
  • the piston 3 is damped in its movement speed in the axial direction.

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)
EP12176373.4A 2011-07-15 2012-07-13 Dampened pyrotechnical actuator Withdrawn EP2546531A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011107543A DE102011107543A1 (de) 2011-07-15 2011-07-15 Gedämpfter pyrotechnischer Aktuator

Publications (2)

Publication Number Publication Date
EP2546531A2 true EP2546531A2 (fr) 2013-01-16
EP2546531A3 EP2546531A3 (fr) 2013-09-11

Family

ID=46548243

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12176373.4A Withdrawn EP2546531A3 (fr) 2011-07-15 2012-07-13 Dampened pyrotechnical actuator

Country Status (2)

Country Link
EP (1) EP2546531A3 (fr)
DE (1) DE102011107543A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202013010972U1 (de) 2013-12-11 2015-03-16 Trw Airbag Systems Gmbh Aktuator sowie Motorhaubenaufsteller
JP2015098230A (ja) * 2013-11-18 2015-05-28 タカタ株式会社 ガス圧式アクチュエータ
EP2878915A1 (fr) * 2013-12-02 2015-06-03 Bayern-Chemie Gesellschaft für flugchemische Antriebe mbH Déverrouillage-actionneur pyrotechnique
CN107448436A (zh) * 2017-08-11 2017-12-08 中国人民解放军63976部队 一种双向动能输出型火药作动器
AT525076B1 (de) * 2021-12-07 2022-12-15 Astotec Automotive Gmbh Pyrotechnischer Aktuator
CN116753209A (zh) * 2023-08-03 2023-09-15 苏州施米特机械有限公司 缓冲多级伺服液压缸

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3717458A1 (de) 1987-05-23 1988-12-01 Diehl Gmbh & Co Pyrotechnisches kraftelement
US5303631A (en) 1991-12-31 1994-04-19 Thomson-Brandt Armements Damped-action pyrotechnic actuator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857890A (en) * 1957-10-07 1958-10-28 Albert M Stott Thruster with damper
US2873726A (en) * 1958-07-18 1959-02-17 Albert M Stott Tension thruster with buffer
US6942261B2 (en) * 2003-08-14 2005-09-13 Autoliv Asp, Inc. Linear actuator with an internal dampening mechanism
DE102008039168B4 (de) * 2008-08-22 2023-06-22 Zf Airbag Germany Gmbh Pyrotechnische Antriebseinheit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3717458A1 (de) 1987-05-23 1988-12-01 Diehl Gmbh & Co Pyrotechnisches kraftelement
US5303631A (en) 1991-12-31 1994-04-19 Thomson-Brandt Armements Damped-action pyrotechnic actuator

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015098230A (ja) * 2013-11-18 2015-05-28 タカタ株式会社 ガス圧式アクチュエータ
EP2878915A1 (fr) * 2013-12-02 2015-06-03 Bayern-Chemie Gesellschaft für flugchemische Antriebe mbH Déverrouillage-actionneur pyrotechnique
DE202013010972U1 (de) 2013-12-11 2015-03-16 Trw Airbag Systems Gmbh Aktuator sowie Motorhaubenaufsteller
CN107448436A (zh) * 2017-08-11 2017-12-08 中国人民解放军63976部队 一种双向动能输出型火药作动器
CN107448436B (zh) * 2017-08-11 2018-08-17 中国人民解放军63976部队 一种双向动能输出型火药作动器
AT525076B1 (de) * 2021-12-07 2022-12-15 Astotec Automotive Gmbh Pyrotechnischer Aktuator
AT525076A4 (de) * 2021-12-07 2022-12-15 Astotec Automotive Gmbh Pyrotechnischer Aktuator
WO2023102589A1 (fr) 2021-12-07 2023-06-15 Astotec Automotive Gmbh Actionneur pyrotechnique
DE202022003365U1 (de) 2021-12-07 2026-03-09 Astotec Automotive Gmbh Pyrotechnischer Aktuator
CN116753209A (zh) * 2023-08-03 2023-09-15 苏州施米特机械有限公司 缓冲多级伺服液压缸

Also Published As

Publication number Publication date
DE102011107543A1 (de) 2013-01-17
EP2546531A3 (fr) 2013-09-11

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