Hydraulic clutch and transmission device provided with the same

Abstract

A hydraulic clutch includes a clutch drum with an outer cylinder that slidably holds a plurality of clutch plates, an inner cylinder that axially extends from an inner circumference of a sidewall, and a sleeve fitted inside the inner cylinder. A clutch piston presses the clutch plates. A plate and the clutch piston define an oil chamber that cancels centrifugal hydraulic pressure. An oil passage that communicates with the oil chamber is on an inner circumferential surface of the inner cylinder. One surface of the sleeve contacts a step formed on the inner cylinder. The sleeve includes a passage in communication with the oil passage and formed on an outer periphery of the sleeve to axially extend toward the end surface, and a second passage formed more axially recessed than an end surface and radially extending to provide communication between the first passage and an inner portion of the sleeve.