Continuously variable transmission oil pressure control device

摘要

In a belt type continuously variable transmission, the apertures 55a, 56a of the drain ports of an oil pressure control valve employed for control of hydraulic devices are arranged outside of the circumferential region WB of the range of movement in which the belt can be moved in the pulley axis direction when the pulley groove width is changed during gear change operation, or outside of the circumferential region WP of the region in which the V groove face of the pulley can be arranged when the pulley groove width is changed during gear change operation.