differential gear series的用法和样例：
- Keywords Tension Leveller;differential gear series;elongation;
- A : Yaw is controlled through a differential gear within the transmission.
- Rewinding shaft complete with machinery differential gear device, tension can be balanced.
- Changing the output speed of step less variator will make the differential gear train realize an output with a comparatively large step-less speed change ratio.
- In the wide weaving machine, the difference of warp tension on two beams are reduced by using a differential gear train of let-off motion double beams (side by side).