题目

英语翻译
Gears are direct contact bodies,operating in pairs,that transmit motion and force form one rotating shaft to another,or from shaft to a slide (rack),by means of successively engaging projections called teeth.
Tooth profiles.The contacting surfaces of gear teeth must be aligned in such a way that the drive is positive; i.e.,the load transmitted must not depend on frictional contact.As shown in the treatment of direct contact bodies,this requires that the common normal to the surfaces not to pass through the pivotal axis of either the driver or the follower.As it is known as direct contact bodies,cycloidal and involute profiles provide both a positive drive and a uniform velocity ratio; i.e.,conjugate action.
Basic relations.The smaller of a gear pair is called the pinion and the larger is the gear.When the pinion is on the driving shaft the pair acts as a speed reducer; when the gear drives,the pair is a speed increaser.Gears are more frequently used to reduce speed tha

提问时间：2020-10-31

答案

齿轮是直接接触式（挤压式）的传动装置,是成对运行的,把机械运动和力矩从一个旋转轴传到另一个旋转轴,或从旋转轴传到齿条,是它们保持啮合的突出物叫齿,齿形；齿轮的接触面必须配合适度,使得传动精准（不丢转）,动力...