| 摘要 |
<p>PURPOSE:To improve the reliability of a device preventing a motor from transmitting its drive power to an output shaft by disconnecting a clutch, when the motor is in trouble, by transmitting rotation of the electric driven motor to the output shaft through the clutch. CONSTITUTION:Three holes 11d are provided in a position with an equal space in an angular part 11c formed in a large contour part 11b of an input shaft 11. A column-shaped roll 22 is fitted into the hole 11d in a manner wherein the axial center of the roll agrees with the axial direction of input and output shafts 11, 12, and a spring 33 is mounted interposing between the paired rolls 22. The roll 22 is pressed to an end face of the hole 11d in its peripheral direction while adapted to one end face of a hexagonal part 12b, and a clutch is constituted of the angular part 11c, hexagonal part 12b, rolls 22 and an outer sleeve 23. The clutch is formed so as to transmit rotation from the outer sleeve 23 to the output shaft 12 only when relative rotation of the input shaft 11 is in a value not less than a certain preset value further with a direction of the relative rotation agreeing with a direction of rotation of the outer sleeve 23.</p> |
