| 摘要 |
An apparatus for changing rotational speed with the aid of clutching activity comprises a planetary gearing mechanism disposed between an input shaft and an output shaft in a housing with an inner ring gear being rotatably supported therein, ring-shaped braking plates comprising an opposing pair of frictional plates, one of them being located on the outer periphery of the inner ring gear to rotate together with the latter and the other one being axially displaceably fitted into the inner periphery of the casing, the first mentioned frictional plate being located opposite to the last mentioned frictional plate, and a ring-shaped bellows located opposite to the last mentioned frictional plate to expand in the axial direction when pressurized fluid is filled therein and contract in the axial direction when it is discharged therefrom. When the ring-shaped bellows expands under the influence of hydraulic force, it comes in contact with the last mentioned frictional plate and thereby frictional clutching is accomplished between both the frictional plates. The planetary gearing mechanism may be constructed in the multistage structure and a ring-shaped bellows is allocated to each stage in the multi-stage structure. |
