Abstract
Toroidal drives for automobile CVTs come in two types: Half Toroidal and Full Toroidal. A comparison of the following characteristics is presented in this paper: spin at the traction contact and axial loading force for EHL traction drive. This paper focuses on the requisite loading force for traction drive. Therefore, a Half Toroidal may be loaded adequately by a simple cam, but a Full Toroidal requires a loading mechanism such as an electro-hydraulic system. An investigation of the spin's influence on the traction performance at the traction power transmission part is also presented.