Early in 1971, we installed an experimental single circular-arc-profile gear in a 2400Hp pass- enger-cargo ship instead of an involute gear for the first time.
1971年起，我们首先在2400马力客货轮中采用单圆弧齿轮（不必磨齿）代替渐开线齿轮，使用到现在情况良好。
Early in 1971, we installed an experimental single circular-arc-profile gear in a 2400Hp pass- enger-cargo ship instead of an involute gear for the first time.
1971年起，我们首先在2400马力客货轮中采用单圆弧齿轮（不必磨齿）代替渐开线齿轮，使用到现在情况良好。
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