Annular friction-clutch facing for a multi-disk clutch

A multi-disk friction device (10) comprising:

• a drive member (12) having a plurality of drive disks (22) supported for rotation with said drive member (12) and a driven member (14) having a plurality of driven disks (28) supported for rotation with said driven member (14), said drive and driven disks (22, 28) interleaved relative to each other such that each drive disk (22) is adjacent a driven disk (28) and moveable toward and away from one another for providing selective frictional engagement therebetween and to transmit torque between said drive and driven members (12, 14);
• each of said drive and driven disks (22, 28) including an annular facing (30) that is disposed for frictional engagement with annular facings (30) of an adjacent one of said disks (22, 28), at least one of said annular facings (30) on said adjacent one of said disks (22, 28) including an inner edge (32) and an outer edge (34) defining a width (w) of said facing (30), a first group of grooves (136, 236) formed on said facing (30) having a first relatively larger cross-sectional area, each groove of said first group (136, 236) having an opening (38) at said outer edge (34) and an opening (40) at said inner edge (32) remote from said other opening (38) and adapted to direct lubricating agents across said width (w) over a substantial area of said facing (30), and a second group of grooves (42) formed on said facing (30) having a second smaller cross-sectional area relative to said first group of grooves (136, 236), said second group of grooves (42) including first and second sets of grooves (44, 46), the grooves of said first set (44) being disposed in intersecting relationship with the grooves of said second set (46), with said second group of grooves (42) adapted to remove excess of the lubricating agents on said facing (30), and wherein said first group of grooves (236) includes a first predetermined sub-group of grooves (248) that extend arcuately in one direction across said width (w) and are spaced in equal increments relative to adjacent grooves of said first predetermined sub-group (248) and a second predetermined sub-group of grooves (250) that extend arcuately in a direction opposite to that of the grooves of said first predetermined sub-group (248) across said width (w) and are spaced in equal increments relative to adjacent grooves of said second predetermined sub-group (250).