EP1771664A2 - Actionneur pyrotechnique - Google Patents

Actionneur pyrotechnique

Info

Publication number
EP1771664A2
EP1771664A2 EP05768223A EP05768223A EP1771664A2 EP 1771664 A2 EP1771664 A2 EP 1771664A2 EP 05768223 A EP05768223 A EP 05768223A EP 05768223 A EP05768223 A EP 05768223A EP 1771664 A2 EP1771664 A2 EP 1771664A2
Authority
EP
European Patent Office
Prior art keywords
actuator
housing
pressure
piston
actuator according
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Withdrawn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
EP05768223A
Other languages
German (de)
English (en)
Inventor
Anton Bretfeld
Uwe Albrecht
Bernhard Lang
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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 Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP1771664A2 publication Critical patent/EP1771664A2/fr
Withdrawn legal-status Critical Current

Links

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

Definitions

  • the invention relates to an actuator with a movably mounted on an actuator housing actuator element and a pyrotechnic Druckele ⁇ element for moving the actuator element.
  • Such an actuator is basically known and is used, for example, for interrupting electrical connections or for initiating or triggering fast switching operations, e.g. in the motor vehicle security area.
  • the pyrotechnic pressure element which is also called a pyroelectric igniter in the case of electrical activation, has the advantage, in addition to a particularly rapid power development, that the energy required for moving the actuator element is stored without pressure over a long period of time by means of suitable chemical substances and if required by means of a comparatively low electrical or mechanical energy can be released.
  • Activation of the pressure element triggers an implementation of the chemical substances and leads to the generation of a pressure pulse, by which the actuator element is moved relative to the actuator housing, for example, is pushed out of this. Since the actuation of the actuator element is very sudden, the actuator element is moved in a short time and uncontrolled from a starting position to an end position. This rapid and uncontrolled movement of the actuator element proves to be disadvantageous in those applications in which the movement process of the actuator element is to last for a certain time and / or bouncing of the actuator element has to be avoided, eg during locking or unlocking operations.
  • the actuator according to the invention comprises an actuator element movably mounted on an actuator housing, a pyrotechnic pressure element for moving the actuator element, and a control means for controlling a force exerted on the actuator element by the pressure element for moving the actuator element.
  • control means By means of the control means, the force exerted on the actuator element when the pressure element is triggered can be adjusted such that the movement of the actuator element takes place at a desired speed.
  • control means is adjustable so that the movement of the actuator element takes place over a desired period of time and / or bouncing of the actuator element is avoided.
  • control means is arranged between the pressure element and the actuator element. It is thereby achieved that the gas pressure generated by the pyrotechnic pressure element does not build up abruptly, but rising in front of a surface of the actuator element to be acted upon. This contributes to an even more controlled movement of the actuator element.
  • control means comprises a shutter.
  • the pressure element arises in front of the diaphragm, i. on the Druckelementsei ⁇ te the aperture, a high-pressure system and behind the aperture, i. on the Aktorelementseite the aperture, a low pressure system.
  • the aperture cross section forms in other words a control parameter of the control means.
  • the diaphragm is integrated in a spacer for the pressure element.
  • the spacer serves for the correct positioning of the pressure element in the actuator housing. Due to the simultaneous integration of the Blen ⁇ de the spacer means fulfills a dual function, whereby the number of components is reduced and the structure of the actuator is simplified.
  • Pressure element provided.
  • the dam causes a more uniform conversion of the chemical substances contained in the pressure element and thus leads to a more even gas pressure. Ultimately, this will result in a more even the actuator element and thus an even more controlled movement of the actuator element achieved.
  • the actuator element is fixed by a damming element in a starting position.
  • the damming element fulfills a double function in that on the one hand it forms a dam for the pressure element and on the other hand it ensures a fixation of the actuator element.
  • the structure of the actuator is further simplified.
  • the damming element preferably has a shearing section which interacts with the actuator housing in such a way that a substantial movement of the actuator element relative to the actuator housing is possible only after shearing of the shearing section by the damming element.
  • the shearing section can be supported in a starting position of the actuator element on a shoulder of the actuator housing.
  • the actuator element Due to the shearing section, the actuator element is not set in motion immediately upon activation of the pressure element, but pressure must initially build up on the side of the actuator element to be acted upon which is sufficient to shear off the shearing section of the dam element. In this way, a force threshold is created, below which no movement of the actuator element takes place. This ensures that the force with which the actuator element is acted upon and which in turn can apply the actuator element, does not fall below a minimum force.
  • a Garein ⁇ direction is provided to hold the actuator element after movement through the pressure element in an end position.
  • the holding device has the effect that the actuator element does not act after a triggering of the actuator can be easily returned from its final position back to its original position.
  • the movement of the actuator element is in other words irreversible.
  • the holding device may comprise a knurling of the actuator element, which is pressed into a bore of the actuator housing during a movement of the actuator element.
  • the Halteeinrich ⁇ tion include a self-locking slope of the actuator housing, in which the actuator element jammed in its movement. Both variants represent a particularly simple form of a holding device for the
  • Actuator element and thus contribute to a simple construction of the actuator.
  • the actuator element is formed by a piston displaceably mounted in the actuator housing.
  • the Aktorele ⁇ ment could be lever-shaped and pivots ver in the event of triggering the Druck ⁇ .
  • FIG. 1 shows a cross-sectional view of a first embodiment of the actuator according to the invention in an initial state.
  • FIG. 2 shows a cross-sectional view of the actuator of FIG. 1 in a released state
  • FIG. 3 shows a cross-sectional view of a second embodiment of the actuator according to the invention in an initial state
  • FIG. 4 is a cross-sectional view of the actuator of FIG. 3 in a tripped condition
  • FIG. 5 shows a cross-sectional view of a third embodiment of the actuator according to the invention in an initial state
  • FIG. 6 is a cross-sectional view of the actuator of FIG. 5 in a tripped condition
  • FIG. 7 shows a cross-sectional view of a fourth embodiment of the actuator according to the invention in an initial state
  • Fig. 8 is a cross-sectional view of the actuator of Fig. 7 in a tripped condition.
  • a first embodiment of the pyrotechnic actuator according to the invention is shown.
  • the actuator has an actuator housing 10, in which a pyrotechnic pressure element 12 is arranged.
  • the pressure element 12 is held by a pressure element carrier 14 in a rear, in the figure lower, portion of the actuator housing 10.
  • a cup-shaped distance cup 16 is provided, the open side of which faces the printing element carrier 14 and the printing element 12 at least partially surrounds.
  • the printing element carrier 14 is fixed to the actuator housing 10.
  • Rapid reaction of the chemical substances produces a gas pressure pulse in the pressure element 12, which opens a cylindrical sleeve 20 of the pressure element 12 projecting into the distance cup 16.
  • predetermined breaking points are provided, e.g. in the form of embossments to ensure a frontal opening of the sleeve 20.
  • the pressure element 12 serves to actuate an actuator element 24, which is arranged in a front region of the actuator housing 10 that is upper in the FIGURE.
  • the actuator element 24 has the shape of a piston, which is mounted displaceably in the axial direction in the actuator housing 10.
  • the piston 24 comprises a cylindrical main section 26, which is guided in a bore 30 provided on a front end face 28 of the actuator housing 10. As shown in FIG. 1, a front end face 32 of the piston 24 in the initial state of the actuator is flush with the front end face 28 of the actuator housing 10.
  • the piston 24 In the region of the rear end of the main section 26, the piston 24 has a disc-shaped head section 34, which is located in a starting position. ge of the piston 24 is guided through a wall portion 36 of the actuator housing 10 and with this substantially gas-tight manner (Fig. 1).
  • a gas pressure is built up in the pressure element 12 by the reaction of the chemical substances present in the pressure element 12, which leads to an opening of the sleeve 20 of the pressure element 12.
  • the emerging gas can flow out of the pressure element 12 and build up a gas pressure in a space 38 delimited by the distance cup 16 and the pressure element 12 or the pressure element carrier 14.
  • the piston head portion 34 is in the initial position of the piston 24 at a bottom 40 of the Distanznapf 16 at.
  • an opening 42 is provided, through which the generated gas can flow through and act on the head portion 34 of the piston 24.
  • the piston 24 is moved away from the distance cup 16 and pushed forward out of the actuator housing 12.
  • the bottom 40 and the opening 42 of the Distanznapfs 16 form a diaphragm, on whose side facing the pressure element 12 side, a high-pressure system and on the side facing the piston 24, a low-pressure system is formed.
  • the pressure build-up in the low-pressure system in dependence on the aperture cross-section, i. the diameter of the opening 42.
  • the diaphragm cross-section thus represents a control parameter via which the pressure rise gradient in the low pressure system and thus ultimately the force acting on the piston 24 can be adjusted.
  • FIG. 2 shows the piston 24 in an end position in which the piston 24 is maximally pushed out of the actuator housing 10 and the head section 34 abuts against the shoulder 46 of the actuator housing 10.
  • FIGS. 3 and 4 show a second embodiment of the actuator according to the invention, which differs from the first embodiment only in that a dam is provided for equalizing the conversion of the chemical substances of the pressure element 12 and the resulting gas pressure.
  • the dam is achieved by a damming element 48, which surrounds the main portion 26 of the piston 24 like a sleeve. In the region of its front end pointing away from the head section 34, the damming element 48 has an outwardly angled section 50. As shown in FIG. 3, the damper element 48 is dimensioned such that the angled section 50 cooperates in the initial position of the piston 24 with the shoulder 46 of the actuator housing 10 and is supported in particular on this. The damming element 48 is therefore arranged between the head section 34 and the shoulder 46 in the axial direction. As a result, the piston 24 is fixed in its initial position on the actuator housing 10 and prevented from shifting relative to the actuator housing 10.
  • the angled portion 50 of the Verdämmelements 48 forms a shear portion which must be sheared to allow a displacement of the piston 24 from the actuator housing 10 addition.
  • the force required to shear the shear section 50 can be adjusted by selecting a suitable material and / or a corresponding geometry of the shear section 50, eg, the thickness of the shear section 50 and / or the arrangement of predetermined breaking notches. On In this way an optimal Verdämmkraft and a particularly gleich ⁇ moderate implementation of the chemical substances can be achieved. This allows the setting of a defined gas pressure and thus ultimately a defined ejection force of the piston 24.
  • Fig. 4 shows the actuator in the tripped state with the piston 24 in its end position, i. maximum is pushed out of the actuator housing 10 her ⁇ .
  • the head section 34 of the piston 24 in this case does not abut directly against the shoulder 46 of the actuator housing 10, but only indirectly via the shearing section 50 between them.
  • a third embodiment of the actuator according to the invention is shown, which differs from the second embodiment only in that the main portion 26 of the piston 24 is provided with a knurling 54.
  • the knurling 54 is in a middle viewed in the axial direction
  • Region of the main portion 26 is positioned so that it is pressed when ejecting the piston 24 in the bore 30 of the front end face 28 of the Aktorge ⁇ housing 10. Furthermore, the knurling 54 is designed in such a way that an optimum pressure is present when the piston 24 reaches its end position. has reached, that is pushed out a maximum of the actuator housing 10 (Fig. 6).
  • the actuator according to the third embodiment thus represents an irreversible system in which the piston 24 indeed move out of the actuator housing 10, but can not be pushed back into this.
  • the term "irreversible” is to be understood here as meaning that the movement of the piston 24 is irreversible, at least with the application of forces occurring during normal use of the actuator. Unlike the actuators according to the first and second embodiments, therefore, the piston 24 of the actuator according to the third embodiment can not be pushed back into its initial position without further ado.
  • a fourth embodiment of the actuator according to the invention is shown, which differs from the third embodiment only in that instead of the knurling 54, a self-locking inclined surface 56 is provided, in which the piston 24 jammed during extension.
  • the inclined surface 56 is seen in the ejection direction of the piston 24 in front of the shoulder 46 formed on the inside of the actuator housing 10 such that an optimal clamping of the head portion 34 is achieved when the piston 24 has reached its end position, that is maximally extended from the actuator housing 10 is ( Figure 8).
  • the fully extended piston 24 can no longer move back into the actuator housing 10, so that even in the fourth embodiment, it is an irreversible actuator.

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)

Abstract

L'invention concerne un actionneur comprenant un élément actionneur monté mobile sur un boîtier, un élément de pression pyrotechnique permettant de déplacer l'élément actionneur et un moyen de commande permettant de commander une force que l'élément de pression exerce sur l'élément actionneur pour le déplacer.
EP05768223A 2004-07-23 2005-07-21 Actionneur pyrotechnique Withdrawn EP1771664A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004035918 2004-07-23
PCT/EP2005/007987 WO2006010562A2 (fr) 2004-07-23 2005-07-21 Actionneur pyrotechnique

Publications (1)

Publication Number Publication Date
EP1771664A2 true EP1771664A2 (fr) 2007-04-11

Family

ID=34979489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05768223A Withdrawn EP1771664A2 (fr) 2004-07-23 2005-07-21 Actionneur pyrotechnique

Country Status (3)

Country Link
US (1) US7698895B2 (fr)
EP (1) EP1771664A2 (fr)
WO (1) WO2006010562A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005051657A1 (de) * 2005-10-28 2007-05-03 GM Global Technology Operations, Inc., Detroit Pyrotechnischer Aktuator
JP6407759B2 (ja) * 2015-02-17 2018-10-17 株式会社ダイセル パイロ式アクチュエータ機構、注射器、及び点火器組立体
JP6637771B2 (ja) * 2016-01-19 2020-01-29 三桜工業株式会社 シリンダハウジング、アクチュエータ及びシリンダハウジングの製造方法
US10145393B2 (en) * 2016-06-17 2018-12-04 Joyson Safety Systems Acquisition Llc Linear actuator

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2892452A (en) * 1957-05-08 1959-06-30 Weinstock Manuel Load sensitive-gas operated thruster
US3112670A (en) * 1962-09-26 1963-12-03 Jr Charles J Litz Gas pressure operated device
US3149456A (en) * 1963-08-16 1964-09-22 Charles S Sterrett Gas damped thruster
US3180082A (en) * 1963-09-03 1965-04-27 Benditt Albert Canopy unlock thruster
US4091621A (en) * 1975-06-02 1978-05-30 Networks Electronic Corp. Pyrotechnic piston actuator
US4028990A (en) * 1976-07-15 1977-06-14 Holex Incorporated Explosively actuated release device for call buoys and the like
US4860698A (en) * 1988-05-11 1989-08-29 Networks Electronic Corp. Pyrotechnic piston device
US5145209A (en) * 1990-02-13 1992-09-08 Trw Vehicle Safety Systems Inc. Seat belt pretensioner
FR2685741A1 (fr) * 1991-12-31 1993-07-02 Thomson Brandt Armements Verin pyrotechnique a course amortie.
DE29616414U1 (de) * 1996-09-20 1997-01-23 Trw Repa Gmbh Gurtstraffer
DE19824382A1 (de) * 1998-05-30 1999-12-02 Mannesmann Vdo Ag Schneckengetriebe
AT405729B (de) * 1998-06-16 1999-11-25 Hirtenberger Praezisionstechni Verzögerungselement für pyrotechnische ladungen
US6454306B1 (en) * 2000-08-01 2002-09-24 Trw Inc. Gas generator for seat belt pretensioner
US6602704B1 (en) * 2002-06-24 2003-08-05 Biomerieux, Inc. Sample contact plate with latchable cover
EP1418121A1 (fr) * 2002-11-06 2004-05-12 Eaton Fluid Power GmbH Système d'actionnement d'urgence pour portes
FR2857421B1 (fr) * 2003-07-10 2005-08-19 Pyroalliance Actionneur pyrotechnique a effet de poussee variable
US6942261B2 (en) * 2003-08-14 2005-09-13 Autoliv Asp, Inc. Linear actuator with an internal dampening mechanism

Non-Patent Citations (1)

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Title
See references of WO2006010562A2 *

Also Published As

Publication number Publication date
US7698895B2 (en) 2010-04-20
WO2006010562A3 (fr) 2006-04-27
US20070119173A1 (en) 2007-05-31
WO2006010562A2 (fr) 2006-02-02

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