内接球面形無段変速トラクションドライブに関する研究 : 第1報, 変速機構および効率の計算法

抄録

The mechanism of a continuously variable speed traction drive (CVT) with two internal spherical disks was introduced. Equations were derived for calculating changes in speed ratio and power losses caused by spinning motion at the contact surface. The effective traction force between the contact surface with an elliptical shape was calculated using the traction coefficient curves obtained by two roller tests and the resulting empirical equations. In this calculation, the effective pressure was introduced instead of a Hertzian mean pressure. The spinning loss was divided into torque and speed losses at the contact surface. Numerical calculation was made for these losses produced in a trial CVT with a capacity of about 5 kW at 1800 rpm. The equations developed may be applicable to any other type of CVT when some modification is made.