| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic control device capable of shortening time from valve opening control start time to actual valve opening.SOLUTION: A hydraulic control device includes an opening and closing valve 1 with an output port 6 for outputting oil pressure supplied from an oil pressure source 2 to a hydraulically-controlled part 3, a valve element 12 for closing the output port 6, a piston 10 moving according to a pressure difference of oil pressures acting on both of the front and back sides thereof integral with the valve element 12, and an input port 5 formed and communicated with the oil pressure source 2 so that the oil pressure supplied from the oil pressure source 2 acts on the surface 11 of the piston 10. Moreover, the hydraulic control device includes an elastic member 14 which applies an elastic force to the piston 10 in a direction where the valve element 12 separates from the output port 6, a communication part 13 with a throttle for making the oil pressure acting on both of the front and back sides of the piston 10 communicated, and decompression mechanisms 18, 19, 20 which selectively decompress the oil pressure acting on a back surface 15 of the piston 10. |
