Patent ID: 7789780
Filing Date: 2010-09-07
Classification: F16H,Y10T

Abstract:
1. A continuously variable transmission comprising: an input side primary pulley which varies a groove width according to a first oil pressure; an output side secondary pulley which varies a groove width according to a second oil pressure; a belt looped around the primary pulley and the secondary pulley, having a contact radius with the pulleys which varies in accordance with the groove width, in which a rotary force transmitted from an output side of an engine of a vehicle via a frictional engagement element is transmitted from the primary pulley to the secondary pulley via the belt, and a speed ratio determined according to a relationship of the contact radius varies continuously; a speed change actuator; a speed change control valve which controls the first oil pressure by switching between a position for supplying the first oil pressure to the primary pulley, a position for discharging the first oil pressure, and a neutral position in accordance with a physical positional relationship between a position of a variable sheave of the primary pulley and a position of the speed change actuator; a pressure adjusting mechanism which adjusts the second oil pressure; a sensor which detects the second oil pressure; and a controller, which: