EP1802871A1 - Pyrotechnic actuator with controllable force and optimised geometry - Google Patents
Pyrotechnic actuator with controllable force and optimised geometryInfo
- Publication number
- EP1802871A1 EP1802871A1 EP05804375A EP05804375A EP1802871A1 EP 1802871 A1 EP1802871 A1 EP 1802871A1 EP 05804375 A EP05804375 A EP 05804375A EP 05804375 A EP05804375 A EP 05804375A EP 1802871 A1 EP1802871 A1 EP 1802871A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shutter
- actuator according
- pyrotechnic
- actuator
- piston
- 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
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 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 used in motor vehicles and intended, for example, to damp 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.
- Patent EP 0 550 321 describes a pyrotechnic cylinder with damped stroke that can be used in any type of energy absorption system.
- This jack comprises a pyrotechnic gas generator, a piston, a pyrotechnic combustion chamber and a counter-pressure chamber and an intermediate chamber included 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. Following initial position of the piston in the body, actuator I 1 may either exert a thrust on an object by said piston emerging from said body or release a mechanical part by retract the piston within 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 of 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 an already existing chamber thus avoiding to have to design a third room. It follows that the a ⁇ tionneurs 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 truncated recess adapted to receive said frustoconical part of the shutter.
- the shutter is made of a deformable material so that, after the motor is triggered, the shutter moves in the hollow cylindrical body until the frustoconical part of the enlarged head fits perfectly into one of the two parts. 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.
- Figure 1 is a longitudinal sectional view of an actuator according to the invention at the beginning of operation.
- FIG. 2 is a longitudinal sectional view of the actuator of FIG. 1 during operation, the shutter device has not yet been triggered.
- Figure 3 is a longitudinal sectional view of the actuator of Figure 1 at the end of operation, the shutter device having been triggered.
- Figure 4 is a perspective view of a shutter of an actuator according to the invention.
- an actuator 1 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 cross section terminating in an enlarged cylindrical portion 24 having a flat part 25.
- Said enlarged head 22 has a circular peripheral groove 26 for receiving a sealing gasket 1, and has a truncated 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 in accordance with 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 then the connecting channel 8, and then pass into the peripheral groove 18 of the hollow cylindrical body 14 and then pass through the internal portion 20 of said body 14, to finally 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 fired at a given moment, causing the shutter 16 to move in the hollow body 14, towards the space 9 in which is placed the piston 10.
- 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 as well That 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0410591A FR2876425B1 (en) | 2004-10-07 | 2004-10-07 | PYROTECHNIC ACTUATOR WITH MODULAR EFFORT AND OPTIMIZED GEOMETRY |
PCT/FR2005/002454 WO2006040439A1 (en) | 2004-10-07 | 2005-10-04 | Pyrotechnic actuator with controllable force and optimised geometry |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1802871A1 true EP1802871A1 (en) | 2007-07-04 |
EP1802871B1 EP1802871B1 (en) | 2008-04-16 |
Family
ID=34952808
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05804375A Expired - Fee Related EP1802871B1 (en) | 2004-10-07 | 2005-10-04 | Pyrotechnic actuator with controllable force and optimised geometry |
Country Status (8)
Country | Link |
---|---|
US (1) | US7568341B2 (en) |
EP (1) | EP1802871B1 (en) |
JP (1) | JP4804474B2 (en) |
KR (1) | KR101194128B1 (en) |
DE (1) | DE602005006148T2 (en) |
ES (1) | ES2304727T3 (en) |
FR (1) | FR2876425B1 (en) |
WO (1) | WO2006040439A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005051657A1 (en) * | 2005-10-28 | 2007-05-03 | GM Global Technology Operations, Inc., Detroit | Pyrotechnic actuator |
US7735405B2 (en) * | 2008-03-14 | 2010-06-15 | Autoliv Asp, Inc. | Pyrotechnic actuator for retracting a piston |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5550561B2 (en) * | 1973-04-06 | 1980-12-18 | ||
DE3817042A1 (en) * | 1987-05-30 | 1988-12-15 | Volkswagen Ag | Pyrotechnical tensioning device for a device for restraining vehicle occupants |
FR2685741A1 (en) * | 1991-12-31 | 1993-07-02 | Thomson Brandt Armements | PYROTECHNIC CYLINDER WITH AMORTIZED RUN. |
ATE461043T1 (en) * | 1999-11-05 | 2010-04-15 | Seiko Epson Corp | INK JET TYPE RECORDING APPARATUS AND METHOD FOR SUPPLYING INK TO THE SUB-TANK USING THE SAME APPARATUS AND METHOD FOR CONTROLLING THE AMOUNT OF INK SUPPLIED TO THE SUB-TANK USING THE SAME APPARATUS |
FR2810064B1 (en) * | 2000-06-09 | 2005-08-05 | Giat Ind Sa | PYROTECHNIC LOCK COMPRISING A MEANS FOR AXIAL MAINTAINING OF ITS ROD |
FR2824875B1 (en) | 2001-05-21 | 2004-01-02 | Pyroalliance | PYROTECHNIC ACTUATOR PROVIDED WITH A RETAINING WASHER |
EP1418121A1 (en) * | 2002-11-06 | 2004-05-12 | Eaton Fluid Power GmbH | Emergency door actuator system |
FR2857421B1 (en) * | 2003-07-10 | 2005-08-19 | Pyroalliance | PYROTECHNIC ACTUATOR WITH VARIABLE PUSH EFFECT |
-
2004
- 2004-10-07 FR FR0410591A patent/FR2876425B1/en not_active Expired - Fee Related
-
2005
- 2005-10-04 JP JP2007535195A patent/JP4804474B2/en not_active Expired - Fee Related
- 2005-10-04 EP EP05804375A patent/EP1802871B1/en not_active Expired - Fee Related
- 2005-10-04 DE DE602005006148T patent/DE602005006148T2/en active Active
- 2005-10-04 WO PCT/FR2005/002454 patent/WO2006040439A1/en active IP Right Grant
- 2005-10-04 US US11/664,642 patent/US7568341B2/en not_active Expired - Fee Related
- 2005-10-04 ES ES05804375T patent/ES2304727T3/en active Active
- 2005-10-04 KR KR1020077007012A patent/KR101194128B1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2006040439A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR101194128B1 (en) | 2012-10-24 |
DE602005006148D1 (en) | 2008-05-29 |
DE602005006148T2 (en) | 2009-05-07 |
JP2008516164A (en) | 2008-05-15 |
KR20070083605A (en) | 2007-08-24 |
FR2876425B1 (en) | 2007-01-26 |
WO2006040439A1 (en) | 2006-04-20 |
FR2876425A1 (en) | 2006-04-14 |
US7568341B2 (en) | 2009-08-04 |
JP4804474B2 (en) | 2011-11-02 |
US20080047269A1 (en) | 2008-02-28 |
EP1802871B1 (en) | 2008-04-16 |
ES2304727T3 (en) | 2008-10-16 |
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