| 摘要 |
<p>A motor drive unit for a vehicular door mirror assembly, in which a motor drive mechanism (3) for turning a visor (2) relative to a stay (1) is provided with a visor-side ring (3n) and a stay-side ring (3p), respectively, having inclines (3q, 3q'). When the visor (2) is turned to a housing position from a use position, the incline (3q) on the visor-side ring (3n) begins to run on the incline (3q') on the stay-side ring (3p). Accordingly, it is possible to ensure certain clearances (C1, C2) required for smooth turning of the visor (2) between the visor (2) and the stay (1). When the visor (2) reaches the housing position, a plane (3r) on the visor-side ring (3n) completely runs on a mountain portion (3s') on the stay-side ring (3p). When the visor (2) is reversely turned to the use position from the housing position, the inclines (3q, 3q') slip down relative to each other, whereby the clearances (C1, C2) between the visor (2) and the stay (1) are almost closed when the visor (2) sufficiently approaches the use position, thus preventing whistling noise generated by running vehicles.</p> |
