就算蝸輪蝸杆速度不夠,他們就不能用單向自鎖傳動齒條而不是鏈條來做動力傳遞?再不濟,用個棘輪也可以保證在扶梯台階的鏈條斷裂時不會下滑吧?
就算蝸輪蝸杆速度不夠,他們就不能用單向自鎖傳動齒條而不是鏈條來做動力傳遞?再不濟,用個棘輪也可以保證在扶梯台階的鏈條斷裂時不會下滑吧?
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