| 摘要 |
PURPOSE:To maintain the lowest speed ratio, by providing a first input port for leading line pressure to a pulley control valve, a second input port for leading the line pressure only during reverse operation and an output port communicated with a hydraulic chamber and disposed in the way of the input port. CONSTITUTION:A port 154 of a pulley control valve 150 is coupled with an output port 124 of a manual valve 120, and line pressure is led continuously to a port 157. During reverse operation, line pressure is led from the output port 124 of the manual valve 120 to the port 154 as well as the port 157. Consequently, line pressure is outputted from the port 155 to a hydraulic chamber 48 irrespective of the position of a spool 152, and the lowest speed ratio is maintained constinuously. |
