| 摘要 |
A webbing retractor for use in a seatbelt system for a vehicle designed to protect an occupant when an emergency situation of the vehicle occurs. When the occupant has a webbing fastened after it has been substantially fully rewound, if an acceleration sensor senses a predetermined level of acceleration acting on the vehicle, the sensor engages with a lock wheel to lock a webbing take-up shaft from rotating in a direction in which the webbing is unwound. When the webbing is substantially fully unwound from the take-up shaft, an engagement lever opposes the lock wheel. In this state, the webbing is allowed to be rewound, but when it is unwound, the engagement lever, which receives the rotational force from the take-up shaft through friction, is engaged with the lock wheel, thus causing the rotation of the lock wheel to be delayed with respect to the rotation of the take-up shaft. Sensing this delayed rotation, a lock means locks the take-up shaft from rotating in the webbing unwinding direction. When the webbing is rewound, the engagement lever is separated from the lock wheel. Accordingly, the lock wheel rotates without any contact between the engagement lever and the tips of ratchet teeth formed on the lock wheel, and therefore no chattering noise is generated.
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