Continuously variable transmission

摘要

A continuously variable transmission sets the spring loads of the springs that urge the movable sheaves of primary-side and secondary-side pulleys, as indicated by curves f,c. Thereby the pulley ratio for the vehicle stop range (the P or D range) becomes a pulley ratio (1) approximate to the pulley ratio rN corresponding to the neutral state. This setting prevents a vehicle from taking off backward when a driver shifts from the vehicle stop range to the D range immediately after starting the engine, that is, before the minimum required fluid pressure is supplied. The setting also causes the pulley ratio (2) occurring after the fluid pressure supply to become approximate to the pulley ratio rN. Thus the continuously variable transmission eliminates a vehicle takeoff response delay caused by a pulley ratio change.