| 摘要 |
The rearview mirror has a shaft attached to a base, a mirror body rotatably mounted on the shaft, a frame fixed to the mirror body, an electric drive motor and a speed reduction gear mechanism fixed to the frame, and a clutch gear mounted on the shaft and engaged with a final stage gear of the speed reduction gear mechanism. The clutch gear has a clutch device for halting the mirror body in a mirror erected position including teeth circumferentially disposed on the undersurface of the clutch gear, ball holding recesses in the upper surface of the frame root portion and steel balls located between the clutch gear undersurface and the frame root portion upper surface and engagable with the teeth so as to be engagable in and disengagable from the ball holding recesses; and a clutch device for avoiding shocks due to halting the mirror body including ball retaining recesses in the clutch gear upper surface, a ball guide having throughgoing holes and steel balls engaged in the throughgoing holes of the ball guide and engagable in and disengagable from the ball retaining recesses to restrain the frame from unnecessary vertical motion during operation so that mirror surface chattering is prevented and the clutch gear load is relieved.
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