Patent ID: 7921975

Claim:
A hydraulic clutch device comprising: a clutch actuation mechanism having a clutch outer; a clutch inner coaxially surrounded by the clutch outer; a plurality of first friction plates engaged with the clutch outer in a relatively non-rotatable manner; a plurality of second friction plates that are arranged so as to alternately overlap with the first friction plates and engaged with the clutch inner in a relatively non-rotatable manner; a bearing plate portion that is fixed to one of the clutch inner and the clutch outer so as to be opposed to the first and second friction plates arranged in a mutually overlapping manner and a pressing plate portion that sandwiches the first and second friction plates with the bearing plate portion; and a clutch disengage/engage control mechanism for switching disengagement/engagement of the clutch actuation mechanism, the clutch disengage/engage control mechanism including: a clutch piston whose opposite sides are faced toward a control hydraulic chamber and a hydraulic canceler chamber and which is connected to the pressing plate portion so as to move to a side for pressing the first and second friction plates in accordance with an increase in hydraulic pressure of the control hydraulic chamber, and a division wall member disposed between the clutch piston and the bearing plate portion that forms the hydraulic canceler chamber between one side of the division wall member and the clutch piston, and forms an oil passage between an opposite side of the division wall member and the bearing plate portion, which introduces lubricating oil toward the first and second friction plates, in cooperation with the clutch inner; wherein the control hydraulic chamber, the hydraulic canceler chamber and the division wall member of the clutch disengage/engage control mechanism are arranged within a range corresponding to a space between outer surfaces of the bearing plate portion and the pressing plate portion, and radially inward of the clutch actuation mechanism.