Patent ID: 7699729
Filing Date: 2010-04-20
Classification: F16H,Y10T

Abstract:
1. A speed ratio change control device for a belt type continuously variable transmission comprising: a continuously variable speed ratio change mechanism in which a belt is wrapped around a primary pulley and a secondary pulley and a speed ratio is varied by controlling a pressure supplied to each pulley to displace a movable sheave of each pulley; a speed ratio change control valve which controls a primary pressure serving as the pressure supplied to the primary pulley; and a link mechanism which moves the speed ratio change control valve to a position in which the primary pressure varies when a speed ratio change actuator moves to a position corresponding to a target speed ratio of the continuously variable speed ratio change mechanism, and returns the speed ratio change control valve to a position in which the primary pressure is maintained by varying the primary pressure such that the movable sheave of the primary pulley is displaced, the device comprising a controller which: