Hydraulic oil return hydraulic control of automatic transmission

摘要

The present invention is a hydraulic oil return hydraulic control device of the automatic transmission to control the return of the operating oil for operating the clutch or the brake to achieve a reduction in the shift time control of the clutch which is a transmission device of the automatic transmission for realizing this switch pressure and A hydraulic control device comprising control of a valve spool receiving a control pressure, wherein the opening / closing means for opening the discharge port by receiving the oil pressure discharged from the release of the hydraulic pressure applied to the valve spool and the return of the clutch piston is connected to the opening / closing means. To provide a hydraulic oil return hydraulic control device for an automatic transmission comprising a hydraulic pressure generating means for raising and lowering the pressure acts to block the line pressure in the flow path to pressurize the valve spool by the signal of the transmission control device.