| 摘要 |
PURPOSE:To enforce two-stage control of the flow rate of pressure oil through a single valve by installing the valve, designed to execute an opening and closing control in accordance with the state of engine output, in a by-pass oil route formed in parallel with an oil supply route from oil pressure source to a changeover equipment and installing an oil flow rate reducing part in the oil supply route in parallel with the by-pass oil route. CONSTITUTION:In parallel with an oil supply route 38 from an oil pressure source to a changeover equipment, a by-pass oil route 66 is formed with a control valve 74, designed to enforce make-and-break control of the oil passage 66 in line with the state of engine output, installed in it. On the other hand, a flow rate reducing part 65 is installed in the oil supply route 38 running in parallel with the by-pass oil route. When the by-pass oil route 66 is shut by the control valve 74, flow volume of pressure oil to the changeover equipment is restricted by the oil flow reducing part 65. When the by-pass route is open, pressure oil is provided to the changeover equipment without any restriction. In this way, the two-stage, variable control is effected by means of a single valve. |
