| 摘要 |
A seat belt retractor ( 10 ) has an actuator ( 14 ) for unlocking and locking the seat belt retractor ( 10 ) An inertial sensor ( 18 ) detects changes in vehicle acceleration and interacts with the actuator ( 14 ) to lock and unlock the seat belt retractor ( 10 ). The inertial sensor ( 18 ) has one inertial sensor mass, each mass ( 26, 27, 29, 30, 32, 33 ) has a wide portion ( 70 ) and a narrow portion ( 72 ). Preferably each inertial sensor mass ( 26, 27, 29, 30, 32, 33 ) has a high density body ( 31 ) embedded in the wide portion ( 70 ) of the elastomeric material ( 34 ). The inertial sensor mass ( 26, 27, 29, 36, 32, 33 ) has a greater density than the elastomeric material ( 34 ) Moreover, the elastomeric material ( 34 ) at least partially surrounds an exterior circumferential surface ( 38 ) of the inertial sensor mass ( 26, 27, 29, 30, 32, 33 ). The inertial sensor mass ( 26, 27, 29, 30, 32, 33 ) has a body ( 31 ) having the wide portion ( 70 ) and optionally the narrow portion ( 72 ) with preferably one or more elastomeric protruding member ( 54, 58 ) extending from said body ( 31 ). The one or more protruding members ( 55, 58 ) are movable relative to said body ( 31 ) and soften contact rattle impacts thus reducing noise.
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