CLUTCHED DRIVEN DEVICE AND ASSOCIATED CLUTCH MECHANISM

摘要

A driven accessory (10) is provided that includes a first rotary clutch portion (50), a second rotary clutch portion (52), a wrap spring (56) and an actuator (60). The wrap spring (56) is configured to transmit rotary power between the first and second rotary clutch portions (50, 52). The actuator (60) is selectively operable for generating a drag force that is applied to the wrap spring (56) to control torque transmission through the wrap spring (56). The actuator (60) includes an actuator input member (140), a brake shoe (144) and a motor (142) that is configured to translate the brake shoe (144) axially along the rotary axis (70). The drag force is generated when the motor (142) is operated in a first mode so that transmission of rotary power between the first rotary clutch portion (50) and the second rotary clutch portion (52) is interrupted.

主权项

1. A driven accessory comprising:
a first rotary clutch portion that is disposed about a rotary axis and adapted to receive a rotary input, the first rotary clutch portion defining a clutch surface; a second rotary clutch portion that is disposed about the rotary axis and adapted to be coupled to an input shaft; a wrap spring having a first end, a second end and a plurality of helical coils between the first end and the second end, the plurality of helical coils engaging the clutch surface, the wrap spring being configured to selectively transmit rotary power between the first rotary clutch portion and the second rotary clutch portion, the rotary power being received by the helical coils from the first rotary clutch portion and being transmitted through the first end; and an actuator that is selectively operable for generating a drag force that is applied to the second end of the wrap spring, the actuator comprising an actuator input member and a brake shoe, the actuator input member being rotatable about the rotary axis relative to the first rotary clutch portion and having a brake rotor with a plurality of first teeth that are disposed circumferentially about the brake rotor, the brake shoe comprising a plurality of second teeth that are meshingly engaged to the first teeth of the brake rotor, the brake shoe being rotatable about and axially movable along the rotary axis.