| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce operation noise and to prolong the lifetime by suppressing resin deformation such as shrinkage or warpage.SOLUTION: A connection part 81c is formed from a first cylindrical portion 81d which supports a connection pin 83 in a freely rotatable manner, and a second cylindrical portion 81e which is provided around the first cylindrical portion 81d and set to an axial dimension L2 shorter than the first cylindrical portion 81d, such that the first cylindrical portion 81d can be reinforced by the second cylindrical portion 81e. In such a case, since the axial dimensions of the first cylindrical portion 81d and the second cylindrical portion 81e are made different, respectively, the first cylindrical portion 81d and the second cylindrical portion 81e are formed in a staircase shape and a radial thickness dimension of the first cylindrical portion 81d can be partially prevented from being increased. Thus, while securing rigidity of the connection part 81c, its volume is decreased, and resin deformation such as shrinkage or warpage can be suppressed. As a result, the operating noise of a rear wiper motor 10 can be reduced and its lifetime can be prolonged.</p> |
