Clutch actuator

A clutch actuator to be used in a clutch device, the clutch device including a clutch provided between a first transmission portion and a second transmission portion that are rotatable relative to each other and whose state is changeable to an engaged state in which torque transmission between the first transmission portion and the second transmission portion is permitted or a non-engaged state in which the torque transmission between the first transmission portion and the second transmission portion is blocked, the clutch actuator comprising:

• a housing;
• a prime mover provided in the housing and configured to operate by energization and output a torque;
• a speed reducer configured to output the torque of the prime mover at a reduced speed;
• and
• a rotational translation unit including a rotation portion, which is configured to rotate relative to the housing when the torque output from the speed reducer is input, and a translation portion, which is configured to move relative to the housing in an axial direction when the rotation portion rotates relative to the housing and change the state of the clutch to the engaged state or the non-engaged state, wherein
• the speed reducer includes an output unit configured to output the decelerated torque of the prime mover to the rotation portion,
• the rotation portion is formed separately from the output unit and formed of a material different from a material of the output unit,
• the rotation portion is configured to rotate integrally with the output unit,
• the rotation portion includes
• a drive cam main body in an annular plate shape,
• a drive cam inner cylinder portion in a cylindrical shape and extending in an axial direction from an outer edge portion of the drive cam main body, and
• a drive cam plate portion in an annular plate shape and extending to a radially outer side from an end portion of the drive cam inner cylinder portion on a side opposite to the drive cam main body,
• the rotation portion is provided integrally with the output unit and is not rotatable relative to the output unit,
• the rotation portion includes a drive cam outer cylinder portion extending from an outer edge portion of the drive cam plate portion in the axial direction,
• the output unit includes
• a gear inner cylinder portion in a cylindrical shape,
• a gear plate portion in an annular plate shape and extending to a radially outer side from one end of the gear inner cylinder portion, and
• a gear outer cylinder portion in a cylindrical shape and extending from an outer edge portion of the gear plate portion in the axial direction, and
• an inner peripheral wall of the gear inner cylinder portion is fitted to an outer peripheral wall of the drive cam outer cylinder portion.