[Abstract] gear is an important part of helicopter reducer, which is the key factor to limit the TBO of reducer. This paper discusses the influence on the strength and service life of the gear from many aspects. Improving the design margin of the gear, improving the gear material, optimizing the contact mark of the gear pair, improving the manufacturing precision of the gear and strengthening the tooth surface can effectively improve the strength of the gear, and have an effect on prolonging the service life of the gear It plays an important role.<br>[Key words] helicopter, reducer, gear<br>
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