| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a highly durable webbing take-up device difficult to cause abrasion when a motor side rotor rotates in the take-up direction relatively to a spool side rotor.SOLUTION: A rotor 92 rotating on receiving the turning force of a motor is provided with a clutch spring 104 constituted by a coil spring. When the rotor 92 rotates, the clutch spring 104 is enlarged in diameter to enter the inside of a spiral groove 152 formed in the inner peripheral part of a clutch gear 100 and make a pressure contact, and this friction transmits the rotation of the rotor 92 to the clutch gear 100. When the rotor 92 rotates in the state of regulating the rotation of the clutch gear 100, the clutch gear 100 is guided to move in the axial direction by the clutch spring 104 entering the spiral groove 152 until the end part of the clutch spring 104 and the axial end part of the clutch gear 100 are brought into pressure contact with each other.</p> |
