V-pulley for belt type continuously variable transmission.

摘要

A V-pulley (31) to be used in a belt type continuously variable transmission, which comprises a stationary pulley half (43) fixedly mounted to a transmission shaft (15); a movable pulley half (44) coupled slidably to the shaft via a plurality of rows of ball keys (45) and cooperating with the stationary half (43) to support a V-belt (32); a plurality of coil springs (49) resiliently biasing the movable half (44) toward the stationary half (43) to impart an initial tension to the V-belt (32); a hydraulically operating device including a first hydraulic member (48) fixedly mounted to the shaft (15) and a second hydraulic member (46) disposed on the movable half (44) to define a hydraulic chamber (47) against the first member (48), the device operating the movable half by hydraulic pressure fed to the hydraulic chamber (47); and a control valve (392) for controlling the pressure supply to the device, wherein a plurality of guide grooves (68) are provided on the outer periphery of the shaft (15) for guiding the rows of ball keys (45) and the coil springs (49) are disposed at positions between the guide grooves (68). This serves to avoid interference of the springs (49) with the ball keys (45) and the hydraulic device.