| 摘要 |
PURPOSE:To realize a small size and a light weight of the whole body of an automatic transmission device, by reducing a shock in the engagement and the removal of clutches and brakes of the automatic transmission device without using an accumulator, and simplifying the structure of a hydraulic control device. CONSTITUTION:In a hydraulic control device in an automatic transmission device which carries out the speed change of a vehicle by feeding a hydraulic pressure to and exhausting a hydraulic pressure from clutches C0 to C2, and brakes B0 to B3 provided to a gear transmitting member, solenoid valves 11 to 16 are provided between the clutches and the brakes, and a pump to be a hydraulic pressure source, and by driving the solenoid valves selectively according to the condition of the vehicle, the feeding or the exhausting of the hydraulic pressure to the clutches and the brakes is controlled directly. And the amount of the hydraulic pressure fed to the clutches and the brakes is also duty- controlled by the solenoid valves 11 to 16. To each oil passage from a solenoid valve to a clutch and a brake, at least one change-over valve of the change-over valves 21 to 30 is provided. |
