| 摘要 |
<p>PURPOSE: To facilitate the positioning of an internal gear to a fixed body by inserting the positioning part of the internal gear into the connection part of the fixed body at the time of assembling the internal gear with the fixed body. CONSTITUTION: A positioning part 67 for positioning an internal gear 63 inserted into a connection part 65 to an under cover 7 is integratedly provided with the internal gear 63. The connection part 65 of the under cover 7 is formed in a rectangular form of both side walls 73, 75 in which a part of a longitudinal wall provided upright on a main body 69 is swollen to the exterior and a connection wall 77 for interconnecting both side walls 73, 75, and a slit 77a is formed in the connection wall 77. Also, the positioning part 67 is projected from the periphery of a cylinder part 79 fitted into the inside of a longitudinal wall 71 in the internal gear 63, and the positioning part 67 comprises a pair of positioning ribs 83, 85 and connector clearance preventing ribs 87, 89. With this constitution, the cylinder part 79 is fitted into the longitudinal wall 71 and the positioning part 67 is inserted into the connection part 65, thereby being able to surely prevent erroneous assembling.</p> |
