HYDRAULIC CONTROL DEVICE OF AUTOMATIC CHANGE GEAR

PURPOSE:To shorten oil path length by connecting a control port to a hydraulic chamber and by providing a change-over working oil path and a control oil path in parallel with each other on a center supporting member, in a device in which the engagement between two hydraulic system friction engaging units is changed over to make changeover among variable-speed stages. CONSTITUTION:A direct clutch in the transmission is actuated by sliding a piston with pressure oil supplied to a hydraulic chamber. In this case, the hydraulic chamber is connected to a third speed port 20 of a 2-3 variable-speed valve 19 through an oil groove 14 formed on a center supportng member 12 secured in the hole 16 in the transmission case 1 and a through hole 18 of the valve body 17. And the hydraulic chamber is connected to the control port 33 of an up-shift timing control valve 28 through an oil groove 40, radial direction control oil hole 39 and oil holes 38, 37, and the oil holes 18 and 37 are connected to each other through an oil path 43 including a throttle 44 interposed therein.