| 摘要 |
PURPOSE:To obtain necessary V-belt transmission torque capacity in response to the engine output torque in such a way that a line pressure regulating valve is provided for regulating the line pressure which is to be fed to a speed change control valve to the oil pressure that is proportional to the engine output torque. CONSTITUTION:A V-belt stepless speed change gear provides a driving pulley 24 and a driven pulley 34 which are able to regulate intervals of V-letter shaped pulley grooves by changing oil pressure in each pulley cylinder chamber 28, 44. And oil pressure feeding to each cylinder chamber 28, 40 is to be led through oil paths 154, 156 by means of a speed change control valve 106. The speed change control valve 106 has the pressured oil from an oil pump 80 to put the engine to be driven fed to a port 122c. In this case, a line pressure regulating valve 102 is interposed into a discharge oil path 116, and said valve 102 has its spool 132 operated by a throttle cam 139 of the engine, by which oil pressure in proportion to the engine output torque can be regulated. |
