Seat belt retractor
First Claim
1. A seat belt retractor comprising:
- a frame, a reel rotationally supported by the frame for winding a seat belt, reel urging means connected to the reel for always urging the reel in a seat belt winding direction, locking means provided between the frame and the reel for allowing the reel to rotate freely in a normal state and preventing the reel from rotation in a belt unwinding direction when necessary, and a belt tension control mechanism for controlling a belt tension of the seat belt, and including a motor for generating a rotational torque;
a power transmission path situated between the motor and the reel and having a speed reducing mechanism therein, an OFF-state in which the rotational torque of the motor is not transmitted between the motor and the reel and an ON-state in which the rotational torque is transmitted between the motor and the reel; and
a power transmission path switching mechanism for selectively switching the power transmission path between the ON-state and the OFF-state and having a stop lever engageable with the speed reducing mechanism so that when the motor is actuated, the stop lever is engaged with the speed reduction mechanism to transfer the rotational torque of the motor to the reel for winding the seat belt.
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Accused Products
Abstract
A seat belt retractor is formed of a frame, a reel rotationally supported by the frame for winding a seat belt, a reel urging device connected to the reel for urging the reel in a seat belt winding direction, a locking device provided between the frame and the reel for allowing the reel to rotate freely in a normal state and preventing the reel to rotate in a belt unwinding direction when necessary, and a belt tension control mechanism for controlling a belt tension of the seat belt. The belt tension control mechanism includes a motor, and a power transmission path situated between the motor and the reel and actuated by the motor. The power transmission path has an OFF-state in which a rotational torque of the motor is not transmitted between the motor and the reel, and an ON-state in which the rotational torque is transmitted between the motor and the reel. A power transmission path switching mechanism selectively switches the power transmission path between the ON-state and the OFF-state. The belt tension control mechanism is simplified by reducing the number of the components.
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Citations
17 Claims
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1. A seat belt retractor comprising:
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a frame, a reel rotationally supported by the frame for winding a seat belt, reel urging means connected to the reel for always urging the reel in a seat belt winding direction, locking means provided between the frame and the reel for allowing the reel to rotate freely in a normal state and preventing the reel from rotation in a belt unwinding direction when necessary, and a belt tension control mechanism for controlling a belt tension of the seat belt, and including a motor for generating a rotational torque;
a power transmission path situated between the motor and the reel and having a speed reducing mechanism therein, an OFF-state in which the rotational torque of the motor is not transmitted between the motor and the reel and an ON-state in which the rotational torque is transmitted between the motor and the reel; and
a power transmission path switching mechanism for selectively switching the power transmission path between the ON-state and the OFF-state and having a stop lever engageable with the speed reducing mechanism so that when the motor is actuated, the stop lever is engaged with the speed reduction mechanism to transfer the rotational torque of the motor to the reel for winding the seat belt.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification