| 摘要 |
PURPOSE:To prevent a belt slip by providing a flow control valve before a reducing valve to fix an oil flow rate, and thereby preventing an excessive oil from draining through the reducing valve. CONSTITUTION:An oil passage 31a is branched from a line pressure oil passage 22 to function as a circuit to generate a fixed base pressure, and communicates with a reducing valve 60 through a pressure compensation type flow control valve 80 to control an oil flow rate and an oil passage 31 with an orifice 32. In order to reduce an oil quantity drained through the reducing valve 60, the pressure compensation type flow control valve 80 is insertedly provided between the oil passage 31a branched from a line pressure oil passage 22 on an outlet side of an oil pump 21 and the reducing valve 60. Consequently, even when the line pressure in the oil passage 22 changes widely, the above-mentioned valve 80 can maintain the oil flow rate within an almost definite range to always keep the total oil quantity drained through the reducing valve 60 and two solenoid valves 65, 67 constant independently of the fluctuation of the line pressure. |
