Abstract
One of the most important performances which a pair of tooth surfaces of gears for power transmission must have is smooth and quiet transmission of the torque. However, the present designing methods of gears consist of different coordinate systems, nomenclatures and calculation methods according to kinds of gears and cannot choose the tooth surfaces to satisfy such dynamic requirements as "no variation of bearing loads". To solve these problems, a unified designing method applicable to all kinds of gears for power transmission is presented, which has the same equations defined in the common coordinate systems which are determined by the disposition of the gear axes and the angular velocities and can deal with the dynamic requirements. An automobile hypoid gear pair with involute helicoids for pinion and the conjugate surfaces for gear is shown as an example of this unified method.
