| 摘要 |
PURPOSE:To suppress the vibration level by providing a spring element which acts effectively in the direction of revolution for one edge surface of a metal gear part and arranging a high-polymeric gear part having the thickness of gear which is less than that of the metal gear part. CONSTITUTION:One edge surface of a metal gear part 1 is provided with a spring element by cutting a rim flange 7, and a gear part 8 which is made of high polymer and has the thickness of gear which is less than that of the metal gear part 1 is arranged. Therefore, when the load is low, vibration can be suppressed and noise can be reduced only by driving the high polymeric gear part 8, and the separation of gear surface can be prevented, and the impact applied onto the metal gear can be weakened, and chattering noise can be softened, and the vibration level can be reduced.
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