To provide a pretensioner which enables a seal member to be formed by an inexpensive material achieving excellent processability and can achieve cost reduction and improvement of ease of processing, and to provide a retractor and a seat belt device.SOLUTION: A power transmission device 32 includes: a rod-like power transmission member 32a which transmits power to a ring gear 31 while plastically deforming; a pipe-like pressure container 32b which guides the power transmission member 32a to the ring gear 31; a sealing member 32c disposed behind the power transmission member 32a; a piston 32d disposed behind the sealing member 32c; and a gas generator 32e disposed at a rear end part of the pressure container 32b. The pressure container 32b includes a diameter reduction part 32f formed at a tip part. The sealing member 32c has a diameter D larger than a gap G of the diameter reduction part 32f, has hardness lower than hardness of the pressure container 32b, and is configured to stop while plastically deforming when colliding with the diameter reduction part 32f.SELECTED DRAWING: Figure 2
【課題】封止部材を低廉で加工性に優れた材質で構成することができ、コストダウン及び加工容易性の向上を図ることができる、プリテンショナ、リトラクタ及びシートベルト装置を提供する。【解決手段】動力伝達装置32は、塑性変形しながらリングギア31に動力を伝達するロッド状の動力伝達部材32aと、動力伝達部材32aをリングギア31に案内するパイプ形状の圧力容器32bと、動力伝達部材32aの後方に配置された封止部材32cと、封止部材32cの後方に配置されたピストン32dと、圧力容器32bの後端部に配置されたガス発生器32eと、を含み、圧力容器32bは、先端部に形成された縮径部32fを備え、封止部材32cは、縮径部32fの隙間Gよりも大きい直径Dを有し、圧力容器32bの硬度よりも低い硬度を有し、縮径部32fに衝突した際に塑性変形しながら停止するように構成されている。【選択図】図2
PRETENSIONER, RETRACTOR, AND SEAT BELT DEVICE
プリテンショナ、リトラクタ及びシートベルト装置
2019-12-05
Patent
Elektronische Ressource
Japanisch
IPC: | B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR |
Pretensioner, seat belt retractor, and seat belt device
Europäisches Patentamt | 2016
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