[특허]Gas generator for a safety device for a motor vehicle

Autoliv Development AB

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특허 상세정보

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Gas generator for a safety device for a motor vehicle

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B60R-021/264 C06D-005/00
미국특허분류(USC)	102/530;
출원번호	US-0936645 (2009-04-10)
등록번호	US-8393274 (2013-03-12)
우선권정보	FR-08 52422 (2008-04-10)
국제출원번호	PCT/EP2009/054344 (2009-04-10)
§371/§102 date	20101019 (20101019)
국제공개번호	WO2009/125015 (2009-10-15)
발명자 / 주소	Luquet, Catherine Costecalde, Laurent Lamy, Igor
출원인 / 주소	Autoliv Development AB
대리인 / 주소	Harness, Dickey & Pierce, P.L.C.
인용정보	피인용 횟수 : 0 인용 특허 : 4

초록
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A generator includes a tubular casing sealed by a bottom, with a wall crossed by discharge orifices. The generator further includes an adapter sleeve retained in the tubular casing by crimping, a pyrotechnic initiator, and a tubular filter covering the discharge orifices. A pyrotechnic charge is inserted between the adapter sleeve and the bottom. A charge securing arrangement includes, on the bottom side, a transverse partition, and on the open side, an open-worked washer urged towards the bottom. A sealing member is capable of breaking during combustion of the charge, to thereby allow the gases to escape out of the casing via the filter and the discharge orifices. After failure of the sealing member, the space occupied by the pyrotechnic charge is delimited axially by the open-worked washer and the bottom.

대표
청구항
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1. A gas generator for a safety device for a motor vehicle, the gas generator comprising: a tubular casing having a first end and a second end, the first end being open, the second end being closed off by a bottom, the tubular casing defining a plurality of discharge orifices;an adapter sleeve housed in the open end of the tubular casing and axially retained in the casing;a pyrotechnic initiator axially mounted in the inside of the adapter sleeve and fixedly maintained in the adapter sleeve;a tubular filter disposed inside the closed end of the casing so as to cover the discharge orifices, the tubular filter defining a hollow interior;a pyrotechnic charge including a plurality of bulk elements inside the tubular casing axially between the adapter sleeve and the bottom;a tubular case disposed in the tubular casing encapsulating the pyrotechnic charge prior to combustion of the pyrotechnic charge, the case co-axially oriented relative to the tubular filter; anda securing part sealing an open end of the case;wherein a transverse end wall of the case is proximate the tubular filter and adapted to at least partially fail and open upon initial combustion of the pyrotechnic charge, thereby allowing the gases generated by combustion of the pyrotechnic charge to escape out of the casing, via the wall of the filter and the discharge orifices, and in that after the at least partial failure and opening of the case, an open space occupied by the pyrotechnic charge is axially delimited only by the securing part and the bottom of the tubular casing. 2. The gas generator according to claim 1, wherein after the at least partial failure and opening of the transverse end wall, the gas generator is configured such that at least a portion of the pyrotechnic charge is inside an inner space of the tubular filter. 3. The gas generator according to claim 1, wherein the securing part is radially disposed within the case and axially moveable with the case. 4. The gas generator according to claim 1, wherein the pyrotechnic charge includes a plurality of propellant tablets. 5. The gas generator according to claim 1, further comprising a coil spring for axially urging the securing part toward the bottom. 6. The gas generator according to claim 1, wherein the securing part is constructed of a deformable and compressible material, the compression of which acts on the pyrotechnic charge for securement. 7. The gas generator according to claim 1, wherein the filter has a widened portion on a part of its axial length turned towards the mouth of the casing. 8. The gas generator of claim 1, wherein the tubular casing includes a circumferential sidewall and the plurality of discharge openings are provided in the circumferential sidewall. 9. A gas generator for a safety device for a motor vehicle, the gas generator comprising: a tubular casing having a first end and a second end, the first end being open, the second end being closed off by a bottom, the tubular casing defining a plurality of discharge orifices;a pyrotechnic initiator axially received within the first end;a tubular filter disposed within the tubular casing proximate the second end so as to cover the discharge orifices, the tubular filter defining a hollow interior;a pyrotechnic charge including a plurality of bulk elements; anda tubular case disposed in the tubular casing and encapsulating the pyrotechnic charge prior to combustion of the pyrotechnic charge, the case co-axially oriented relative to the tubular filter, the tubular case having a transverse end wall proximate the tubular filter, the transverse end wall adapted to at least partially fail and open upon initial combustion of the pyrotechnic charge, such that an open space occupied by the pyrotechnic charge is axially delimited in a first direction by the bottom of the tubular casing and radially delimited at least in part by the tubular filter. 10. The gas generator according to claim 9, wherein the tubular case and the filter are oriented in an end-to-end relationship. 11. The gas generator according to claim 9, wherein after the at least partial failure and opening of the transverse end wall, the gas generator is configured such that at least a portion of the pyrotechnic charge is inside an inner space of the tubular filter. 12. The gas generator according to claim 9, wherein the pyrotechnic charge includes a plurality of propellant tablets. 13. The gas generator according to claim 9, further comprising a securing part sealing the first end of the case. 14. The gas generator according to claim 13, further comprising a spring for axially urging the securing part toward the bottom. 15. The gas generator according to claim 13, wherein the securing part is constructed of a deformable and compressible material, the compression of which acts on the pyrotechnic charge for securement. 16. The gas generator of claim 9, wherein the tubular casing includes a circumferential sidewall and the plurality of discharge openings are provided in the circumferential sidewall. 17. A gas generator for a safety device for a motor vehicle, the gas generator comprising: a tubular casing having a closed end, an open end, and a plurality of discharge orifices;a pyrotechnic initiator axially received within the open end;a tubular filter disposed within the tubular casing proximate the closed end so as to cover the discharge orifices, the tubular filter defining a hollow interior;a pyrotechnic charge disposed in the tubular casing;a tubular case disposed in the tubular casing and encapsulating the pyrotechnic charge prior to combustion of the pyrotechnic charge, the case co-axially oriented relative to the tubular filter, the tubular case having a transverse end wall proximate the tubular filter, the transverse end wall adapted to at least partially fail and open upon initial combustion of the pyrotechnic charge, such that an open space occupied by the pyrotechnic charge is axially delimited in a first direction only by the closed end of the tubular casing and radially delimited at least in part by the tubular filter; andan open space proximate the second end of the tubular casing, the open space radially delimited only by the tubular filter and axially delimited in a first direction by the closed end and in a second direction by the transverse end wall such that the pyrotechnic charge is free to occupy the entirety of the open space upon at least partial failure of the transverse end wall. 18. The gas generator of claim 17, wherein the tubular casing includes a circumferential sidewall and the plurality of discharge openings are provided in the circumferential sidewall.

이 특허에 인용된 특허 (4)

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Gas generator for a safety device for a motor vehicle

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Gas generator for a safety device for a motor vehicle

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