To provide a clutch device having reduced wear and improved durability while stabilizing the separating load (the operating torque) of an input disc on a clutch disc (reducing a change since set), and to provide a motor device and a wiper motor.
In the clutch device, when cutting off the rotation transmission of the input disc 28 from the clutch disc 38 but before completely separating the input disc 28 from the clutch disc 38, a relative moving stroke between both of them is gradually increased and the energizing force (thrust) of a coil spring is also increased but component force Fb in a rotation transmitting direction R is reduced, consequently suppressing an increase in operating torque during a time from starting overload operation to complete separation. Thus, the separating load (the operating torque) of the input disc 28 on the clutch disc 38 is stabilized (a change since set is reduced). At the same time, a change amount of a relative moving stroke between an engaging protruded portion 37 and an engaging recessed portion 42 is gradually reduced, resulting in reduced wear and improved durability.
COPYRIGHT: (C)2007,JPO&INPIT
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Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda