EP1802871B1 - Pyrotechnisches betätigungsglied mit steuerbarer kraft und optimierter geometrie - Google Patents

Pyrotechnisches betätigungsglied mit steuerbarer kraft und optimierter geometrie Download PDF

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Publication number
EP1802871B1
EP1802871B1 EP05804375A EP05804375A EP1802871B1 EP 1802871 B1 EP1802871 B1 EP 1802871B1 EP 05804375 A EP05804375 A EP 05804375A EP 05804375 A EP05804375 A EP 05804375A EP 1802871 B1 EP1802871 B1 EP 1802871B1
Authority
EP
European Patent Office
Prior art keywords
actuator according
shutter
pyrotechnic
actuator
hollow cylindrical
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 - Fee Related
Application number
EP05804375A
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English (en)
French (fr)
Other versions
EP1802871A1 (de
Inventor
Evrard Borg
Eric Domaine de la Coudoulière LASPESA
Jean-Paul Nadeau
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.)
Safran Ceramics SA
Original Assignee
SNPE Materiaux Energetiques SA
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Publication of EP1802871A1 publication Critical patent/EP1802871A1/de
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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

Definitions

  • the technical field of the invention is that of pyrotechnic actuators comprising a piston and whose essential function is to exert a thrust to move an object by causing the piston to emerge.
  • the pyrotechnic actuators according to the invention are particularly suitable for use in safety systems implemented in motor vehicles and intended, for example, to dampen the movement of certain parts that have been set in motion during a mechanical shock. of the motor vehicle with an external element, such as a seatbelt, the front bumper of the vehicle, the steering column or the bonnet of the vehicle in the event of a frontal collision between the vehicle and a pedestrian.
  • This jack comprises a pyrotechnic gas generator, a piston, a pyrotechnic combustion chamber and a back pressure chamber and an intermediate chamber in said combustion chamber and an end of the piston.
  • a channel connects the intermediate chamber to the backpressure chamber. The gases emitted by the generator pressurize the intermediate chamber to oppose the movement of the piston and thus dampen its stroke, a portion of said gases being conveyed by the channel to the counter-pressure chamber.
  • the patent application FR 2,824,875 relates to a pyrotechnic actuator having a body, a piston, and a washer for retaining said piston in said body.
  • the actuator may either push on an object by causing said piston to emerge from said body, or release a mechanical part by retracting the piston into said body.
  • the pyrotechnic actuators described in these two patents have a nominal operation characterized by a constant amplitude displacement of the piston, thus generating a unique effect on the parts or objects intended to interact with said actuators.
  • the pyrotechnic actuators according to the invention involve a mechanical pressure regulating device in the sliding chamber of the piston for controlling the thrust force or the displacement amplitude of said piston. In this way, the pyrotechnic actuators according to the invention have a variable thrust effect or even a configurable stroke and can therefore be adapted to a plurality of configurations requiring more or less displacement of the piston.
  • the object of the present invention relates to a pyrotechnic actuator comprising a pyrotechnic gas generator, a combustion chamber, a piston that can move in a sliding chamber under the effect of said gases, the two chambers being in communication with one another. the other.
  • the main characteristic of an actuator according to the invention is that it comprises a shutter device implemented after the actuator has been triggered to interrupt the communication between said chambers, said shutter device being included in the sliding chamber. In this way, the shutter device is housed in a chamber already existing to avoid having to design a third room. It follows that the actuators according to the invention are compact and that their machining is simplified.
  • the shutter device is autonomous and can be triggered from a control unit.
  • the decoupling of the triggering of the shutter device with that of the actuator contributes to increasing the flexibility of use of said actuator by allowing easy programming of the sequence of the two ignitions.
  • the two chambers are of cylindrical shape and have their axes of revolution parallel to each other, said chambers being interconnected by a connecting channel whose axis is perpendicular to those of said chambers.
  • the pyrotechnic gas generator is included in the combustion chamber and comprises an igniter and a pyrotechnic charge.
  • the closure device comprises a hollow cylindrical body fixed in the sliding chamber, a motor and a shutter, said body having connecting means which, in combination with the connecting channel, enable communication between the chamber. combustion chamber and the space of the sliding chamber in which the piston is located.
  • connection means are constituted by at least one lateral bore located in the hollow cylindrical body in continuity with the connecting channel, and by a passage placed at one end of said body, said passage providing communication between the interior of said body and the space of the sliding chamber in which the piston is located.
  • the lateral bore provides communication between the connecting channel and the interior of the hollow cylindrical body.
  • the hollow cylindrical body comprises a circular peripheral groove at the bottom of which have been made several bores, said groove being partially defined by the inner wall of the sliding chamber, and the connecting channel opening into said groove.
  • the bores are regularly distributed around said hollow body.
  • the hollow cylindrical body abuts against an internal shoulder of the sliding chamber.
  • the engine is a pyrotechnic gas generator.
  • said motor is constituted by an electropyrotechnic igniter, possibly reinforced by a charge of powder generating gas.
  • the shutter is housed in the hollow cylindrical body and said shutter has an enlarged head adapted to slide in a sealed manner in said body, said head being extended by a cylindrical portion of reduced section ending in an enlarged cylindrical portion having a flat. More specifically, the outer surface of said enlarged head is in contact with the inner surface of said hollow body, sealing being effected by means of a circular seal surrounding said head, said seal being crushed against the inner surface of said hollow body .
  • the enlarged head has a frustoconical end and the end of the body in which is located the passage ends with a frustoconical recess adapted to receive said frustoconical portion of the shutter.
  • the shutter is made of a deformable material so that, after the motor is tripped, the shutter moves in the hollow cylindrical body until the frustoconical part of the enlarged head fits perfectly into the body. recess frustoconical said body.
  • the pyrotechnic actuators according to the invention have the advantage of being autonomous and having a small footprint thanks to a great simplicity of design. They can thus be easily inserted into any type of device or object requiring the functions required by such actuators. In addition, they have all the advantages associated with the use of pyrotechnic charges, namely: reliability due to control of ignition, reduced space requirement due to the small size of the pyrotechnic charges, and great variability of the effects due to the diversity. pyrotechnic compositions that can be retained for these actuators. Finally, the use of pyrotechnic charges allows sequential ignition perfectly controlled between the actuator and the shutter device.
  • the figure 1 is a longitudinal sectional view of an actuator according to the invention at the beginning of operation.
  • the figure 2 is a longitudinal sectional view of the actuator of the figure 1 during operation, the shutter device has not yet been triggered.
  • the figure 3 is a longitudinal sectional view of the actuator of the figure 1 at the end of operation, the shutter device having been triggered.
  • the figure 4 is a perspective view of a shutter of an actuator according to the invention.
  • an actuator 1 according to the invention comprises a gas generator 2, a combustion chamber 3, a sliding chamber 4 and a closure device 5.
  • the combustion chamber 3 has a cylindrical shape and contains the gas generator 2, said generator 2 comprising an igniter 6 that can be electrically triggered, and a pyrotechnic charge 7 generating a gas.
  • the igniter 6 closes one end of the combustion chamber 3, the other end being closed by design.
  • the pyrotechnic charge 7 is in the form of a cylindrical propellant block fixed in the combustion chamber 3 and located near the igniter 6.
  • the combustion chamber 3 is contiguous for part of its length to the chamber of combustion. sliding 4 which itself has a cylindrical shape.
  • the two chambers 3,4 are positioned relative to each other so that their axes of revolution are parallel to each other and they are connected to one another via a connecting channel 8 cylindrical whose axis of revolution is perpendicular to those of the two chambers 3,4.
  • the actuator 1 according to the invention has a compact geometry due to a global shape in H.
  • the sliding chamber 4 comprises a first part corresponding to the location where the closure device 5 is located, and a second part corresponding to a cylindrical space 9 in which is placed a piston 10, said space 9 being in continuity with the closure device 5.
  • the piston 10 has a widened cylindrical body 11 able to slide tightly in said space 9 by means of a seal 12 surrounding said enlarged body 11, said body 11 being extended by a rod 13 of reduced section.
  • the closure device 5 comprises a hollow cylindrical body 14 fixed in the sliding chamber 4, a motor 15 in the form of an igniter and a shutter 16. The closure device 5 abuts against an internal shoulder 17 of the sliding chamber 4.
  • the hollow cylindrical body 14 comprises a circular peripheral groove 18 at the bottom of which have been made several bores 19 uniformly distributed around said body 14, said groove 18 being partially defined by the inner wall of the sliding chamber 4 and being positioned in said chamber 4, so that the connecting channel 8 opens into said groove 18.
  • said bores 19 which are comparable to radial channels, connect the connecting channel 8 and therefore the combustion chamber 3 to the inner portion 20 of the hollow cylindrical body 14 of the closure device 5.
  • Said hollow body 14 has an end which is partially delimited by the igniter 15, the other end having a passage 21 for connecting the inner portion 20 of said hollow body 14 to the space 9 in which is placed the piston 10.
  • the sliding chamber 4 has an end closed by the igniter 15 the other end being open so as to emerge the rod 13 of the piston 10.
  • the shutter 16 is constituted by a cylindrical piece having an enlarged head 22 extended by a cylindrical portion 23 of reduced section ending with an enlarged cylindrical portion 24 having a flat surface 25.
  • Said enlarged head 22 has a circular peripheral groove 26 intended to receive a seal, and has a frustoconical end 27.
  • the shutter 16 is made of flexible material elastomer type.
  • the shutter 16 is placed in the hollow cylindrical body 14 in a position for which it is as close as possible to the igniter 15, while leaving free the bores 19 and the passage 21 thus ensuring communication between the combustion chamber 3 and the space 9 of the sliding chamber 4 in which is placed the piston 10
  • the operating mode of an actuator 1 according to the invention is carried out by respecting the following steps.
  • the pyrotechnic gas generator 2 located in the combustion chamber 3 is ignited by combustion via the igniter 6 which is triggered by an electrical signal.
  • the gases produced by the combustion of the pyrotechnic charge 7 invade the combustion chamber 3 and the connecting channel 8 to then pass into the peripheral groove 18 of the hollow cylindrical body 14, then through the inner portion 20 of said body 14, finally to reach the space 9 in which is placed the piston 10.
  • the pressurization of said space 9 causes the displacement of the piston 10 whose rod 13 will gradually emerge from the sliding chamber 4.
  • the igniter 15 of the closure device 5 is ignited at a given moment, causing the displacement of the shutter 16 in the hollow body 14 towards the space 9 in which the piston 10 is placed.
  • the shutter 16 ends its stroke when the frustoconical end 27 of its enlarged head 22 fits perfectly into the frustoconical recess 28 of one of the ends of the hollow body 14, thus closing the bores 19 and the passage 21.
  • the gases from the combustion chamber 3 then invade the space of the hollow body 14 located at the rear of the shutter 16, said space having been generated by the displacement of said shutter 16

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)
  • Automotive Seat Belt Assembly (AREA)

Claims (12)

  1. Pyrotechnischer Aktuator (1) mit einem pyrotechnischen Gasgenerator (2), einer Brennkammer (3), einem Kolben (10), der sich unter der Wirkung der Gase in einer Gleitkammer (4) bewegen kann, wobei die beiden Kammern (3, 4) miteinander in Verbindung stehen, dadurch gekennzeichnet, daß der Aktuator (1) eine Verschlußvorrichtung (5) aufweist, die nach Auslösen des Aktuators (1) verwendet wird, um die Verbindung zwischen den Kammern (3, 4) zu unterbrechen, wobei die Verschlußvorrichtung (5) in die Gleitkammer (4) eingeschlossen ist.
  2. Aktuator nach Anspruch 1, dadurch gekennzeichnet, daß die Verschlußvorrichtung (5) unabhängig ist und von einer Steuerzentrale aus ausgelöst werden kann.
  3. Aktuator nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die beiden Kammern (3, 4) zylinderförmig sind und ihre Drehachsen parallel zueinander verlaufen, wobei die Kammern (3, 4) über einen Verbindungskanal (8), dessen Achse zu denjenigen der Kammern (3, 4) senkrecht verläuft, untereinander verbunden sind.
  4. Aktuator nach irgendeinem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der pyrotechnische Gasgenerator (2) in die Brennkammer (3) eingeschlossen ist und daß er einen Zünder (6) sowie eine pyrotechnische Ladung (7) umfaßt.
  5. Aktuator nach irgendeinem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Verschlußvorrichtung (5) einen in der Gleitkammer (4) befestigten zylindrischen Hohlkörper (14), einen Motor (15) sowie einen Verschluß (16) umfaßt, wobei der Körper (14) Verbindungsmittel (19, 21) besitzt, die in Kombination mit dem Verbindungskanal (8) ermöglichen, die Verbindung zwischen der Brennkammer (3) und dem Raum (9) der Gleitkammer (4), in dem sich der Kolben (10) befindet, sicherzustellen.
  6. Aktuator nach Anspruch 5, dadurch gekennzeichnet, daß die Verbindungsmittel (19, 21) von wenigstens einer seitlichen Bohrung (19), die sich in dem zylindrischen Hohlkörper (14) in Fortsetzung des Verbindungskanals (8) befindet, und von einem an einem der Enden des Körpers (14) ausgebildeten Durchgang (21) gebildet ist, wobei der Durchgang (21) die Verbindung zwischen dem Innenraum des Körpers (14) und dem Raum (9) der Gleitkammer (4), in dem sich der Kolben (10) befindet, sicherstellt.
  7. Aktuator nach Anspruch 6, dadurch gekennzeichnet, daß der zylindrische Hohlkörper (14) eine kreisförmige Umfangsnut (18) aufweist, an deren Grund mehrere Bohrungen (19) ausgebildet worden sind, wobei die Nut (18) durch die innenwand der Gleitkammer (4) teilweise begrenzt ist, und daß der Verbindungskanal (8) in die Nut (18) mündet.
  8. Aktuator nach irgendeinem der Ansprüche 5 bis 7, dadurch gekennzeichnet, daß der zylindrische Hohlkörper (14) an einer Innenschulter (17) der Gleitkammer (4) in Anschlag gelangt,
  9. Aktuator nach irgendeinem der Ansprüche 5 bis 8, dadurch gekennzeichnet, daß der Motor (15) ein pyrotechnischer Gasgenerator ist.
  10. Pyrotechnischer Aktuator nach irgendeinem der Ansprüche 5 bis 9, dadurch gekennzeichnet, daß der Verschluß (16) in dem zylindrischen Hohlkörper (14) gelagert ist und daß er einen verbreiterten Kopf (22) besitzt, der geeignet ist, in dem Körper (14) dicht zu gleiten, wobei der Kopf (22) durch einen zylindrischen Teil (23) mit verringertem Querschnitt verlängert ist, der durch einen eine Abflachung (25) aufweisenden verbreiterten zylindrischen Teil (24) ausläuft.
  11. Aktuator nach Anspruch 10, dadurch gekennzeichnet, daß der verbreiterte Kopf (22) ein kegelstumpfförmiges Ende (27) aufweist und daß das Ende des Körpers (14), in dem sich der Durchgang (21) befindet, durch eine kegelstumpfförmige Ausnehmung (20) ausläuft, welche geeignet ist, den kegelstumpfförmigen Teil (27) des Verschlusses (16) aufzunehmen.
  12. Aktuator nach Anspruch 11, dadurch gekennzeichnet, daß der Verschluß (16) aus einem verformbaren Material gefertigt ist, so daß sich der Verschluß (16) nach Auslösen des Motors (15) in dem zylindrischen Hohlkörper (14) soweit bewegt, bis sich der kegelstumpfförmige Teil (27) des verbreiterten Kopfes (22) perfekt in die kegelstumpfförmige Ausnehmung (20) des Körpers (14) einfügt.
EP05804375A 2004-10-07 2005-10-04 Pyrotechnisches betätigungsglied mit steuerbarer kraft und optimierter geometrie Expired - Fee Related EP1802871B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0410591A FR2876425B1 (fr) 2004-10-07 2004-10-07 Actionneur pyrotechnique a effort modulable et a geometrie optimisee
PCT/FR2005/002454 WO2006040439A1 (fr) 2004-10-07 2005-10-04 Actionneur pyrotechnique a effort modulable et a geometrie optimisee

Publications (2)

Publication Number Publication Date
EP1802871A1 EP1802871A1 (de) 2007-07-04
EP1802871B1 true EP1802871B1 (de) 2008-04-16

Family

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Application Number Title Priority Date Filing Date
EP05804375A Expired - Fee Related EP1802871B1 (de) 2004-10-07 2005-10-04 Pyrotechnisches betätigungsglied mit steuerbarer kraft und optimierter geometrie

Country Status (8)

Country Link
US (1) US7568341B2 (de)
EP (1) EP1802871B1 (de)
JP (1) JP4804474B2 (de)
KR (1) KR101194128B1 (de)
DE (1) DE602005006148T2 (de)
ES (1) ES2304727T3 (de)
FR (1) FR2876425B1 (de)
WO (1) WO2006040439A1 (de)

Families Citing this family (2)

* 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
US7735405B2 (en) * 2008-03-14 2010-06-15 Autoliv Asp, Inc. Pyrotechnic actuator for retracting a piston

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5550561B2 (de) * 1973-04-06 1980-12-18
DE3817042A1 (de) * 1987-05-30 1988-12-15 Volkswagen Ag Pyrotechniche spannvorrichtung fuer eine fahrzeuginsassen-rueckhalteeinrichtung
FR2685741A1 (fr) * 1991-12-31 1993-07-02 Thomson Brandt Armements Verin pyrotechnique a course amortie.
ATE461043T1 (de) * 1999-11-05 2010-04-15 Seiko Epson Corp Aufzeichnungsgerät des tintenstrahltyps und verfahren zur tintenversorgung für den untertank mittels desselben gertes und verfahren zur kontrolle der dem untertank zugeführten tintenmenge mittels desselben gerätes
FR2810064B1 (fr) * 2000-06-09 2005-08-05 Giat Ind Sa Verrou pyrotechnique comprenant un moyen de maintien axial de sa tige
FR2824875B1 (fr) 2001-05-21 2004-01-02 Pyroalliance Actionneur pyrotechnique muni d'une rondelle de retenue
EP1418121A1 (de) * 2002-11-06 2004-05-12 Eaton Fluid Power GmbH Türbetätigungssystem für Notfälle
FR2857421B1 (fr) * 2003-07-10 2005-08-19 Pyroalliance Actionneur pyrotechnique a effet de poussee variable

Also Published As

Publication number Publication date
KR101194128B1 (ko) 2012-10-24
DE602005006148D1 (de) 2008-05-29
DE602005006148T2 (de) 2009-05-07
JP2008516164A (ja) 2008-05-15
KR20070083605A (ko) 2007-08-24
FR2876425B1 (fr) 2007-01-26
EP1802871A1 (de) 2007-07-04
WO2006040439A1 (fr) 2006-04-20
FR2876425A1 (fr) 2006-04-14
US7568341B2 (en) 2009-08-04
JP4804474B2 (ja) 2011-11-02
US20080047269A1 (en) 2008-02-28
ES2304727T3 (es) 2008-10-16

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