Supporting structure for control elements for automatic transmission

A supporting structure for control elements for an automatic transmission at least including a first frictional element being actuated by a piston operated by hydraulic pressure and a cylinder supporting said piston, a one-way brake having outer and inner races and an engaging member placed between said outer and inner races so as to mechanically engage depending on the rotational direction of said outer race, and a second frictional element having a clutch drum operatingly enclosing therein a plurality of clutch plates, comprising:

• a support member being comprised of a cylindrical portion axially extending along a transmission shaft and a flange portion radially extending from one axial end of said cylindrical portion and defining said cylinder therein, said cylindrical portion and said flange portion integrally formed with each other as one piece;
• said cylindrical portion being integrally formed with said inner race as one-piece, and arranged for supporting on an outer periphery thereof said clutch drum of said second frictional element as well as said one-way brake;
• a transmission case associated with said support member, for securing said flange portion of said support member by fastening means onto an inner wall thereof from the interior of said transmission case;
• and
• said clutch drum being integrally formed with said outer race of said one-way brake, and associated with said transmission case through said first frictional element, such that said clutch drum is engaged with said transmission case when said first frictional element is activated, while said clutch drum is disengaged from said transmission case when said first frictional element is deactivated.