Operation oil supply apparatus in oil pressure operated type transmission for vehicle

An operation oil supply apparatus in an oil pressure operated type transmission for a vehicle of such a constructional type that, in a transmission casing, there are contained a transmission mechanism having at least two stage driving trains of a low speed and a high speed including oil pressure clutches of a low speed and a high speed respectively on a pair of rotary shafts extending between one side wall portion and an opposite side wall portion of the transmission casing, and a valve block attached to the one side wall portion and having a manual valve and a shift valve for controlling oil supply to the respective oil pressure clutches and the manual valve has a 1st forward running range in which oil supply is directed selectively through said shift valve to the respective oil pressure clutches and a 2nd forward range in which oil supply to the high speed oil pressure clutch is cutoff and oil supply is given to the low speed oil pressure clutch, characterized in that the high speed oil pressure clutch is supplied with oil under pressure by an oil supply pipe which extends into an axially extending central opening in the rotary shaft supporting the high speed oil pressure clutch from one end of the shaft, and the low speed oil pressure clutch is supplied with oil under pressure through an oil supply opening in an extension of the valve block which surrounds the rotary shaft supporting the low speed oil pressure clutch.