Patent ID: 6958024

Claim:
An automotive V-belt nonstage transmission, comprising: a drive pulley having a fixed sheave fixedly mounted on a drive shaft so as to move integrally with the drive shaft and having a conical pressure surface, a movable sheave mounted on the drive shaft, restrained from rotation relative to the drive shaft, capable of axially moving on the drive shaft and having a conical pressure surface; a driven pulley; a V-belt extended between the drive and the driven pulley; a return coil spring pushing the movable sheave of the drive pulley so as to part from the fixed sheave; a flyweight mechanism capable of pushing the movable sheave of the drive pulley toward the fixed sheave of the drive pulley as rotating speed of the drive shaft increases; and a clutch mechanism including a collar being rotatable relative to the fixed and movable sheaves and mounted rotatably on the drive shaft, and a one-way clutch mounted between the drive shaft and the collar, interlocking the collar and the drive shaft and capable of transmitting only rotation of the collar in the normal rotating direction to the drive shaft, and the collar having an outer periphery surface serving as a bottom surface of a V-groove defined by the respective conical pressure surfaces of the fixed and the movable sheave of the drive pulley, and a conical surface forming a conical pressure surface corresponding to a central part, around the drive shaft, of the conical pressure surface of the fixed sheave of the drive pulley.