| 摘要 |
A seat belt device with an electric pre-tensioner is described. This seat belt device has a spindle for retracting a seat belt, an electric actuator which generates power for rotating the spindle, and a power transmission mechanism which transmits the power from the electric actuator to the spindle. The power transmission mechanism comprises an actuator-side gear (80) to which the power from the electric actuator is transmitted, a spindle-side gear (82) which is provided on the spindle's side and an elastic piece (81) which is mounted either of the actuator-side gear (80)and the spindle-side gear (82) and which is capable of being brought into engagement with the other gear, such that a torque-limiter is formed. When a torque difference which is larger than a predetermined value is generated between the actuator-side gear and the spindle-side gear, the elastic piece (81) cancels the engagement with the other gear so as to move relative to the other gear so that the torque difference becomes equal to or less than a predetermined value (Figure 17). |
