Patent ID: 7568257
Filing Date: 2009-08-04
Classification: B60S,F16D,Y10T

Abstract:
1. A motor apparatus comprising: clutch device that includes: a first rotatable member, which is reciprocally rotated by a drive force applied thereto; a second rotatable member, which is coupleable with the first rotatable member at a maximum rotational coupling force to rotate integrally with the first rotatable member without making relative rotation between the first rotatable member and the second rotatable member at the time of reciprocally rotating the first rotatable member; an output shaft, which is connected to the second rotatable member to rotate integrally with the second rotatable member, wherein the output shaft is normally rotatable within a predetermined normal reciprocal rotational angular range; at least one rotation limiter, which limits reciprocal rotation of the output shaft beyond a limited angular range, which is larger than the normal reciprocal rotational angular range of the output shaft, wherein: initiation of the coupling between the first rotatable member and the second rotatable member at the maximum rotational coupling force without making the relative rotation between the first rotatable member and the second rotatable member is enabled only when the output shaft is placed in a single engageable point within the normal reciprocal angular range of the output shaft; and when a load applied to the output shaft is equal to or greater than a predetermined value, the first rotatable member and the second rotatable member are decoupled from one another, so that the relative rotation is made between the first rotatable member and the second rotatable member; a housing, which receives the clutch device; and a motor maim body, which is connected to the clutch device to supply the drive force to the first rotatable member of the clutch device, wherein: the housing includes a stopper projection, which is formed integrally inside the housing at an inner surface of the housing where the clutch device is received; the at least one rotation limiter is formed integrally in the stopper projection of the housing; and when at least one of the second rotatable member and the output shaft is directly or indirectly engaged with one of the at least one rotation limiter formed integrally in the stopper projection, the reciprocal rotation of the second rotatable member is limited.