| 摘要 |
A forward/reverse change-over mechanism ( 3 ) of an automatic transmission comprises a forward clutch ( 5 ) inside a drum ( 7 ) with the base ( 7 c) which rotates together with an input shaft ( 1 ). The forward clutch ( 5 ) engages by driving a piston ( 9 ) housed in the drum ( 7 ) by the oil pressure of an oil chamber ( 10 ) between a base ( 7 c) and the piston ( 9 ). Projecting bearings ( 16 ) which seat the piston ( 9 ) are formed by press-forming at equal angular intervals concentrically with the axial center of the drum ( 7 ) in the base ( 7 c). By installing a sensor body ( 18 ) which responds to the passage of depressions ( 17 ) formed underneath the bearings ( 16 ), the forward/reverse change-over mechanism ( 3 ) can be made compact and manufactured with a small number of parts and machining steps.
|
