| 摘要 |
PURPOSE:To perform smooth starting by a method wherein a shift control valve for controlling speed change varies and controls a first press force, by which the target number of revolutions of an engine is set, according to an acceleration will and a charge gear ratio by using first and second cam surfaces. CONSTITUTION:A shift control valve controls a speed change by means of a first press force, generated by a second arm 171 of a throttle cam mechanism 150 and responding to a target engine rotation speed, and a governor pressure. The first press force is varied and controlled by using a first cam surface 176 of a cam plate 175 and a second cam surface 157 of a cam hole 156 of a cam shaft 155 and by means of the cam shaft 155 rotated in linkage with an accel, and a cam contact pin 172 vertically moved according to a change gear ratio through a piston member 52 and a spool 151. In this case, with the decrease in a change gear ratio, the first press force is increased, the increase factor, in the vicinity of the maximum value of a change gear ratio, of a second cam is higher than that of a first cam, and a first cam 176 is used in a range in which an acceleration will is low and a change gear ratio is high, and a second cam 157 is used in a reverse range. This constitution performs smooth starting. |
