| 摘要 |
A seat belt retractor has a belt reel that is mounted rotatably on a frame. A motive spring biases the belt reel in a winding direction. An electrical driving device adjusts the spring force of the motive spring. A clutch located between the electrical driving device and the belt reel transmits torque produced by the electrical driving device to the belt reel. The clutch has a spring that can be deformed by torque and, when deformed, brings the clutch into an engaged state.
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