Lubricating structure of hydraulic clutch

A lubricating structure of a hydraulic clutch comprising:

• a drum-shaped clutch housing connected to a first rotating shaft, said clutch housing having a first spline formed on the inner circumference thereof;
• a clutch hub connected to a second rotating shaft coaxial with said first rotating shaft, said clutch hub having a cylindrical portion having a first end and a second end, a flange formed integrally with said cylindrical portion near said first end, and a second spline formed on the outer circumference of said cylindrical portion;
• a plurality of first clutch plates axially slidably engaged with said first spline of said clutch housing;
• a plurality of second clutch plates axially slidably engaged with said second spline of said clutch hub;
• clutch engaging means for engaging said first and second clutch plates with each other;
• and
• lubricating oil supplying means for supplying a lubricating oil into an internal space defined inside of said cylindrical portion of said clutch hub from the side of said second end;
• said cylindrical portion of said clutch hub having a plurality of first lubricating oil passages for radially outwardly introducing said lubricating oil from the inner circumference of said cylindrical portion to the outer circumference thereof, said first lubricating oil passages comprising a plurality of first recesses extending axially from the second end of said cylindrical portion toward the first end thereof;
• said flange of said clutch hub having a plurality of second lubricating oil passages for axially introducing said lubricating oil from said internal space toward said first end of said cylindrical portion.