| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic control device that can achieve both the reduction of size and weight and the suppression of a change of a transmission ratio in an automatic transmission. <P>SOLUTION: The hydraulic control device for the automatic transmission includes: a first actuator 17 which changes the transmission ratio by being supplied with oil pressure from an oil pressure source 24 through a first supply valve SLP1 and by changing the transmission ratio to discharge the oil pressure through a first discharge valve SLP2; and second actuators 12, 13 which switches a torque direction by being supplied with the oil pressure from the oil pressure source 24 through a second supply valve SLC1 and by discharging the oil pressure through a second discharge valve SLC2. When the oil pressure of the oil pressure source 24 increases, the second supply valve SLC1 is constituted to be opened before the first supply valve SLP1 opens and the second discharge valve SLC2 is constituted to be opened with a valve opening pressure lower than that of the second supply valve SLC1. <P>COPYRIGHT: (C)2012,JPO&INPIT |
