| 摘要 |
PROBLEM TO BE SOLVED: To provide a pretensioner, a seat belt retractor, and a seat belt device with the same that can be easily manufactured and placed in accurate operation.SOLUTION: A pretensioner 15 has a predetermined number of balls 20 provided in a pipe 17, the balls moving with the pressure of a gas of a gas generator in emergency to transmit force for rotating a spool in a seat belt winding direction. The pretensioner at least comprises an engagement member 50 which is arranged more on a tip side of the pipe 17 than the balls 20, and moves with the pressure of the gas to press a ring gear 25 earlier than the balls 20, the engagement member 50 having a first engagement part arranged on a tip side of the pipe 17, a second engagement part arranged at the first engagement part on the side of the balls 20, and a join part joining the first engagement part and second engagement part together. After the first engagement part presses the ring gear 25, the first engagement part and second engagement part separate at the join part.SELECTED DRAWING: Figure 3 |
