Gear transmission mechanism with large transmission ratio is often composed of many single-stage gears. The sum of these gears and their supporting parts is the gear drive chain.
The whole gear transmission chain is an organic whole connected with each other. Its components have a close impact on the transmission work, so the transmission chain must be considered as a whole. In addition to first determining the structure and reasonable accuracy of the gear itself, the following conditions shall also be ensured:
- Strictly keep the relationship between the rotation axes of gears;
- Avoid the installation eccentricity and end face deflection caused by the error between gear and shaft, shaft and bearing during assembly;
- Ensure that the transmission chain has sufficient rigidity;
- If necessary, special device to eliminate air travel shall be used.