| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that it is required that a sub-gear is molded with a high dimension accuracy when compensating the backlash of a pinion gear and a sector gear with the sub-gear of a low rigidity material and generation of rattling and noise cannot be certainly prevented when deforming a damper fitted to a hole. SOLUTION: The sector gear 28 is made a three-layer structure where a central plate material 28c is clamped by plate materials 28L, 28R from left and right sides, and the central plate material is formed so as to be divided to a rear half part 28c1 fixed between the left and right plate materials and a front half part 28c2 having a tooth at its distal end and clamped between the left and right plate materials movably in a radial direction. A biasing member 36 is arranged between a front half part and a rear half part of the central plate material and biasing force in a radial direction is applied to the front half part. Thereby, the teeth 28-1 to 3 of the front half part are projected more than the overlapped teeth of the left and right plate material, are pressed to teeth 26-1, 26-2 of the pinion gear, and are engaged with each other while clamped from the left and right sides. Therefore, the pinion gear and the sector gear are engaged free from backlash. COPYRIGHT: (C)2009,JPO&INPIT
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