In the mid-1950s, due to the rapid development of space technology, the mechanisms and instruments of the spacecraft control system put forward new requirements for mechanical transmission. For example, the transmission ratio is large, the volume is small, the weight is light, the transmission precision is high, the hysteresis is small, and even zero hysteresis is required. In some cases, the movement of the sealing wall and the ability to work in a high vacuum state are required. For these requirements, the existing general transmission has not met the requirements, which has led to new breakthroughs in mechanical transmission. One of the breakthroughs is harmonic gear transmission.
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