| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil pressure control device for a continuously variable transmission for reducing loss of pump drive. SOLUTION: A first oil pump 131 having a discharge opening communicated with a line pressure oil passage 141 through a line pressure check valve 16 and a second oil pump 132 having a discharge opening communicated with the line pressure oil passage 141 are provided. The line pressure oil passage 141 and a secondary pressure oil passage 142 are communicated with each other through a first pressure control valve 11, and the discharge opening of the first oil pump and the second pressure control valve 12 are communicated with each other through the first pressure control valve 11, and the first pressure control valve 11 is provided with a structure for controlling communication of the discharge opening of the first oil pump with the second pressure control valve 12 in response to line pressure of the line pressure oil passage 141. Capacity of the first oil pump is formed larger than capacity of the second oil pump, and a pump check valve 136 is provided to prevent the generation of reverse flow of the oil from a suction opening of the second oil pump, a bypass oil passage 137 is provided to communicate the discharge opening of the first oil pump with the the second oil pump suction opening side of the pump check valve 136, and a selector valve 138 is provided to close the bypass oil passage when suddenly changing speed. COPYRIGHT: (C)2005,JPO&NCIPI |
