| 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 directly connected to the first end and the second end, at least a portion of 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 that is rotatable about the rotary axis relative to the first rotary clutch portion, the actuator input member being axially movable along the rotary axis between a first position, in which the actuator input member is drivingly engaged to the first rotary clutch portion to cause the wrap spring to uncoil against the clutch surface such that rotary power is transmitted between the first rotary clutch portion and the second rotary clutch portion, and a second position in which the actuator input member is disengaged from first rotary clutch portion; wherein rotary power that is output from the wrap spring to the second rotary clutch portion is transmitted through an axial end face of a wire that forms the first end of the wrap spring, and wherein the axial end face abuts an abutment surface formed on the second rotary clutch portion, wherein the actuator comprises a first coil assembly and a second coil assembly, wherein the first coil assembly is operable for translating the actuator input member in a first axial direction and the second coil assembly is operable for translating the actuator input member in a second axial direction that is opposite the first axial direction. |
