齿廓啮合的基本定律告诉我们:欲获得定传动比的齿轮传动,两齿廓的形状必须使它们在任何接触点上的公法线都通过节点 P,满足这样条件的一对齿廓称为共轭齿廓。节点 P 是这对齿轮连心线上的一个固定点,也就是这对齿轮的相对运动瞬心。以两轮的中心为园心过节点 P 所作的两个园称为节园。两轮的角速度与它们的节园的半径成反比。两个节园在节点 P 处的公切线与两齿廓在 The basic law of tooth meshing tells us that in order to achieve a gear ratio of constant gear ratio, the shape of the two tooth profiles must be such that their common normal at any point of contact passes through node P and a pair of tooth profiles meeting such conditions are called Yoke profile. Node P is a fixed point on the concentric line of the gears, that is, the instantaneous center of relative motion of the pair of gears. The two gardens made of nodes P in the center of two rounds are called the festival garden. The angular velocity of the two wheels is inversely proportional to the radius of their garden. The common tangent of the two knots at node P lies with both tooth profiles