| 释义 |
轮轴lúnzhóu简单机械,由一个轮子和同心轴组成,实质是可以连续旋转的杠杆。轮子半径是轴半径的几倍,作用在轮上的动力就是作用在轴上阻力的几分之一。轮和轴的半径相差越大就越省力。辘轳、纺车等就属于这一类。{wheel and axle; wheel shaft; simple mechanism consisting of a wheel and a concentric axle that acts a continuously rotating lever. Since the radius of the wheel is several times longer than that of the axle, the force needed to move the wheel is several times less than the resisting friction on the axle. The greater the difference between the radius of the wheel and that of the axle, the more energy-saving it becomes; a theory according to which the windlass, spinning wheel, etc., are manufactured.} |