Seat belt retractor and seat belt apparatus
View Patent ↗Provided are a seat belt retractor and a seat belt apparatus, which can reduce the emanation of abutment noise upon switching of a clutch. A first embodiment of a seat belt retractor according to the present invention includes a spool for retracting a webbing W to restrain an occupant, a motor for generating drive torque to rotate the spool, a power transmission means for transmitting the drive torque of the motor to the spool, a clutch for connecting or disconnecting the power transmission means and the spool, and a casing for housing the clutch and the power transmission means. The clutch has a pawl rotatably connected to the casing, an actuating pin for rotating the pawl in conjunction with the power transmission means, and a stopper portion for limiting the rotation of the actuating pin.
1. A seat belt retractor comprising:
a spool for retracting a webbing to restrain an occupant;
a motor for generating drive torque to rotate the spool;
a power transmission device for transmitting the drive torque of the motor to the spool;
a clutch for connecting or disconnecting the power transmission device and the spool; and
a casing for housing the clutch and the power transmission device,
wherein the clutch has a pawl rotatably connected to the casing, an actuating pin for rotating the pawl in conjunction with the power transmission device, and a stopper portion for contacting the actuating pin and limiting the rotation of the actuating pin;
wherein the stopper portion is formed so that the pawl does not contact with a side portion of the casing when the stopper portion contacts with the actuating pin.
2. The seat belt retractor according to claim 1 , wherein the stopper portion is a protruding portion formed on the casing, a member disposed on and extending away from the casing, or a rod-like member disposed in the casing.
3. The seat belt retractor according to claim 1 , wherein the actuating pin or the stopper portion has a buffer portion on the surface thereof.
4. The seat belt retractor according to claim 3 , wherein the buffer portion is made of a material that can be used in a temperature range of −40° C. to 80° C.
5. The seat belt retractor according to claim 1 , wherein the power transmission device includes a drive gear and at least one intermediate gear, wherein the drive gear and at least one intermediate gear are interconnected through a gear mesh.
6. A seat belt apparatus comprising:
a webbing for restraining an occupant;
a seat belt retractor for retracting the webbing;
a guide anchor provided on the vehicle body side to guide the webbing;
a belt anchor for fixing the webbing to the vehicle body side;
a buckle disposed on the side of the seat; and
a tongue disposed on the webbing,
the apparatus restraining the occupant with the webbing in the seat by inserting the tongue into the buckle,
wherein the seat belt retractor is a seat belt retractor according to any one of claims 1 to 4 .