Patent ID: 8881880

Claim:
A hydraulic pressure clutch comprising: a first connecting hub of which a part of the first connecting hub is disposed on an input shaft and bent and extended from the part of the first connecting hub and in which first, second, and third oil holes are formed; a transmission case of which a part of the transmission case is inserted between the first connecting hub and the input shaft, the part of the transmission case including first, second, and third oil supply portions; an inner sleeve which is connected to an outer portion of the first connecting hub, the inner sleeve including first, second, and third oil passages; a boss which is connected to an outer portion of the inner sleeve, the boss including fourth, fifth, and sixth oil passages; an outer sleeve which is connected to an outer portion of the boss, the outer sleeve including seventh and eighth oil passages; a clutch drum comprising an inner protrusion connected to an outer portion of the outer sleeve and forming a clutch mounting space and an outer protrusion forming a second clutch mounting space; a second connecting hub connected to an outer portion of the outer sleeve; a first piston forming a first piston chamber together with the second connecting hub therebetween and being operated by hydraulic pressure input to the first piston chamber; a plurality of first clutch plates disposed on the outer protrusion and selectively pushed by the first piston along an axial direction; a plurality of first friction disks disposed on a first clutch hub alternately with the first clutch plates; a first balance wall connected to the inner protrusion and forming a first balance chamber together with the first piston therebetween; a second piston forming a second piston chamber together with the boss therebetween, and being operated by hydraulic pressure input to the second piston chamber; a plurality of second clutch plates disposed on the inner protrusion and selectively pushed by the second piston along the axial direction; a plurality of second friction disks disposed on a second clutch hub alternately with the second clutch plates; and a second balance wall forming a second balance chamber together with the second piston therebetween, wherein the first balance chamber and the second balance chamber are supplied hydraulic pressure simultaneously through one oil line.