| 摘要 |
To reduce the cost of a seat belt retractor having a function of taking up a seat belt by power a motor. A spool is fitted in a base frame such that a torsion bar functions as a shaft of the spool. Two gear-clutch casings are disposed on the left and right sides of the spool via a pretensioner and a locking mechanism, respectively, wherein two motors are disposed to the gear-clutch casings, respectively. The two motors achieve respective functions which are different from each other and rotate at respective constant speeds. Unlike a case that one motor is used and the rotation speed of the motor is controlled, a speed controller and a noise filter for the motor are not required, thereby reducing the cost of the entire device.
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