下载彩票app送彩金

一些低速重載的機械中, 原動機通常是高轉速的, 這就需要減速比從上百到數千,齒輪減速機，而效率又不要太低的傳動裝置。如果僅靠增加傳動的級數或增大,如齒輪的齒數差來達此目的, 顯然是不經濟的。

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