provided with an enlarged thickness annular section 128 which defines a generally circular opening 130 through which the driving shaft 124 extends in a similar manner the end section 122 of the housing 112 is provided with an annular section 132 which defines an opening not shown through which the driven shaft 126 extends the aforesaid annular openings are communicable with an internal clutch chamber generally designated by the numeral 134 within which the clutch actuating mechanism for drivingly connecting the driving shaft 124 with the driven shaft 126 is located as will hereinafter be described in detail as shown in fig3 the driving shaft 124 is provided with an annular driving hub generally designated by the numeral 136 which defines a central axially extending bore 38 within which the inner end of the driving shaft 124 is received the hub 136 and shaft 124 are drivingly connected with one another by any suitable keyway means or the like whereby upon rotation of the driving shaft 124 the hub 136 will rotate concomitantly therewith the driving hub 136 includes a radially outwardly extending inner end section generally designated by the numeral 140 and carries or supports an oil seal ring assembly 142 having a radially outwardly disposed section 143 which is communicable via a suitable oil supply conduit 144 with an oil manifold.