Retractor for a seat belt, and clutch used in same

摘要

A retractor for a seat belt is disclosed, including a frame, a spool that is mounted rotatably to the inside of the frame, a webbing that is wound on the spool to be pulled-in constantly to the inside of the frame and pulled-out freely from the inside of the frame to the outside thereof, a controller for recognizing vehicle information and controlling the pulling-in of the webbing, a motor for generating a driving force to rotate the spool in accordance with the control of the controller and a clutch for receiving the driving force from the motor and transmitting the driving force to the spool wherein the clutch includes; a driven gear that receives the driving force from a driving gear provided on a rotation shaft of the motor; a plate that is provided facing to one end of the driven gear and inter-connected with the driven gear; a braking disk that is provided to be engaged with the other face opposing one face of the plate, facing to one end of the driven gear, and is in friction with the plate to stay temporally the plate when the plate is inter-connected with the driven gear; and a locking pole that is mounted pivotably to the plate and pivoted by a rotation of the driven gear when the plate is stayed temporally by the braking disk to be meshed with a pinion gear provided on a rotation shaft of the spool thereby transmitting the driving force transmitted from the driven gear to the spool.

主权项

1. A clutch for use in a retractor for a seat belt through which a webbing wound on a spool is pulled-in by a driving force of a motor in accordance with vehicle information, the clutch comprising:
a driven gear that receives the driving force from a driving gear provided on a rotation shaft of the motor; a plate that is provided at a place with one face of the plate opposing one end of the driven gear and is inter-connected with the driven gear; a braking disk that is provided to be engaged with another face of the plate, the other face of the plate opposing the one face of the plate, wherein the braking disk is facing the one end of the driven gear and is in friction with the plate to stay temporally the plate when the plate is inter-connected with the driven gear, wherein the braking disk comprises a friction protrusion that protrudes toward the plate to be in friction with the other face of the plate, and wherein a slit is formed on a part of a boundary surface where the friction protrusion is formed so that the friction protrusion is movable to a direction opposing a protruding direction of the friction protrusion; and a locking pole that is mounted pivotably to the one face of the plate is pivoted by a rotation of the driven gear when the plate is stayed temporally by the braking disk, the locking plate to be meshed with a pinion gear provided on a rotation shaft of the spool thereby transmitting the driving force transmitted from the driven gear to the spool, wherein the locking plate is in a location between the plate and the driven gear.