초록 ▼

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 controlle

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.

대표청구항 ▼

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

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; anda 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. 2. The clutch of claim 1, wherein the driven gear is provided with gear teeth on an outer peripheral surface to receive the driving force from the driving gear, wherein the driven gear is provided with a hole in a middle of the driven gear through which the pinion gear passes, and wherein the one end of the driven gear opposing the plate is dented to receive the plate and the locking pole. 3. The clutch of claim 2, wherein the plate is formed in a circular shape corresponding to a shape of the indented one end of the driven gear, wherein the plate is inter-connected with the driven gear by being inserted in the indented one end of the driven gear, and wherein the plate has a hole in a middle of the plate through which the pinion gear passes. 4. The clutch of claim 3, wherein the braking disk further comprises: a body in a circular shape corresponding to a shape of the other face of the plate, the body being provided with a hole in a middle of the body through which the pinion gear passes; andat least one staying protrusion provided on an outer peripheral surface of the body to be stayed on a cover that surrounds the clutch. 5. The clutch of claim 4, wherein the boundary surface in which the slit is formed is between the body of the braking disk and the friction protrusion so that the friction protrusion is movable toward the other face of the body from which the friction protrusion protrudes. 6. The clutch of claim 5, wherein the friction protrusion comprises a plurality of friction protrusions that are formed in a radial direction around the hole formed on the body of the braking disk and wherein the boundary surface in which the slit is formed is arranged on an imaginary circumference around the hole formed on the body of the braking disk. 7. The clutch of claim 5, wherein a second oblong groove is formed on the indented one end of the driven gear along an imaginary circumference around the hole formed in the middle of the driven gear, and a catching member that is caught over one side of a second oblong groove is provided on the one face of the plate opposing the indented one end of the driven gear to rotate the driven gear and the plate together. 8. The clutch of claim 7, wherein the catching member and the one side of the second oblong groove are separated by an initial distance before the driven gear receives the driving force from the driving gear, wherein the plate is stayed temporally with friction from the braking disk before the driven gear receives the driving force from the driving gear, wherein when the locking pole pivots to be meshed with the pinion gear in response to the driven gear receiving the driving force from the driving gear, the initial distance between the catching member and the one side of the second oblong groove is decreased gradually until the catching member is caught over the one side of the second oblong groove, and wherein the catching member is kept in a state of being caught over one side of the second oblong groove when the locking pole pivots to be meshed with the pinion gear and when the locking pole is meshed with the pinion gear. 9. The clutch of claim 3, wherein the braking disk is formed with a circular plate corresponding to a shape of the other face of the plate, wherein a hole is formed on the middle of the braking disk, and wherein the braking disk comprises a body that is stayed on a cover surrounding the clutch to be in friction with the plate. 10. The clutch of claim 9, wherein the plate is stayed temporally through a staying member mounted between the plate and the braking disk when the plate is inter-connected with the driven gear to increase friction between the plate and the braking disk. 11. The clutch of claim 10, wherein the staying member is made of an elastic member in a ring shape where both ends of the elastic member are fixed to the plate and an inner peripheral surface of the elastic member is engaged with a circular protrusion provided on the braking disk. 12. The clutch of claim 10, wherein the indented one end of the driven gear is provided with a contact member of the driven gear to be engaged with a contact portion that protrudes from the one face of the plate to rotate the driven gear and the plate after the locking pole is pivoted to be meshed with the pinion gear. 13. The clutch of claim 12, wherein the contact member of the driven gear and the contact portion of the plate are separated by an initial distance before the driven gear receives the driving force from the driving gear, wherein the plate is stayed temporally with friction from the braking disk before the driven gear receives the driving force from the driving gear, and wherein, when the locking pole pivots to be meshed with the pinion gear in response to the driven gear receiving the driving force from the driving gear, the initial distance between the contact member of the driven gear and the contact portion of the plate is decreased gradually until the contact member of the driven gear and the contact portion of the plate are engaged so that the driven gear and the plate are rotated together. 14. The clutch of claim 2, wherein: the locking pole is pivoted to protrude from an inner peripheral surface of a hole provided on the driven gear to be meshed with the pinion gear, orthe locking is pivoted to be received into the indented one end of the driven gear to be separated from the pinion gear. 15. The clutch of claim 14, wherein the locking pole is guided by a guide provided on the indented one end of the driven gear, wherein the guide is configured with a first oblong groove into which a guide protrusion provided on one side of the locking pole is inserted, wherein the first oblong groove is formed from an outer peripheral surface of the driven gear to a middle thereof, and wherein the guide protrusion moves along the first oblong groove when the driven gear rotates thereby guiding the locking pole. 16. The clutch of claim 2, wherein a gear train is provided between the driving gear and the driven gear and wherein the driven gear receives the driving force from the driving gear through the gear train. 17. The clutch of claim 1, wherein the vehicle information is interpreted by a controller and the controller controls the driving of the motor. 18. The clutch of claim 1, wherein the braking disk is fixed to a cover surrounding the clutch. 19. The clutch of claim 18, further comprising a staying member which is made of elastic member in a ring shape, both ends of which are fixed to the plate, an inner peripheral surface of which is engaged with a circular protrusion provided on the braking disk wherein a friction extent between the plate and the braking disk is increased by staying temporally the plate when the plate is inter-connected with the driven gear. 20. A retractor for a seat belt, the retractor comprising: a frame;a spool, the spool being mounted rotatably to the inside of the frame;a webbing, the webbing being 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, the controller for recognizing vehicle information and controlling the pulling-in of the webbing;a motor, the motor generating a driving force to rotate the spool in accordance with the control of the controller, wherein the driving force is generated by a driving gear provided on a rotation shaft of the motor;a gear train, the gear train comprising a plurality of gears configured to receive the driving force from the motor;a clutch, the clutch receiving the driving force from the gear train and transmitting the driving force to the spool, wherein the clutch comprises: a driven gear that receives the driving force from the gear train;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; anda 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.