| 摘要 |
PROBLEM TO BE SOLVED: To simplify a hydraulic control device to realize its miniaturization in an automatic transmission where a hand brake participates in grasp changed speed change. SOLUTION: At the time of grasp changed speed change, a hand brake acts in a reverse direction where the sensibility of engaging force to the variation of oil pressure is dull, and pressure governing oil pressure sent from a pressure governing valve 21 controlled by control oil pressure being a room part of a throttle linear solenoid valve SLT acts on a brake hydraulic servo B-4. The pressure governing oil pressure sent from a pressure governing valve 20 based on a linear solenoid valve exclusively used for pressure governing acts on the other clutch oil pressure servo C-3 at the time of grasp changed speed change. In addition, in the case where the hand brake acts independently, the hand brake acts in a self-locking directional where the sensibility of engaging force to the variation of oil pressure is high, and oil pressure sent from the pressure governing valve 20 acts on the hydraulic servo. |
