| 摘要 |
A gear includes an outer ring, an inner ring, gear teeth, and elastic members engaged with the gear teeth. The outer ring defines a number of first fixing holes. The inner ring and the outer ring are concentric, and the inner ring defines a number of second fixing holes respectively corresponding to the first fixing holes, and each pair of first and second fixings hole align with the center of the rings, and define an axis of movement for spring loaded gear teeth. |
