| 摘要 |
A pretensioner designed to wind tight a belt of a seatbelt system by transmitting power from a power source to a belt take-up element through a clutch mechanism. The clutch mechanism has a driving rotary member connected to the power source, a driven rotary member connected to the belt take-up element, and an engagement member interposed between the two members. The engagement member is brought into engagement with the driving and driven rotary members by a rotational phase difference between the driving and driven rotary members to transmit rotational power from the driving rotary member to the driven rotary member. A follower rotary member provided with rotational resistance is disposed in between the driving rotary member and the driven rotary member. Recesses are respectively formed on the driving rotary member and the follower rotary member to define a space for accommodating the engagement member. The engagement member is retained in the recesses so that the engagement member can be pushed out toward the driven rotary member by contraction of the accommodating space which is caused by a rotational phase difference between the driving rotary member and the follower rotary member.
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