Patent ID: 8657093

Claim:
Apparatus comprising: a dry application clutch friction disc, wherein the friction disc comprises a toothed outer circumferential area, wherein the outer circumferential area comprises disc material, wherein the friction disc comprises a central circular open area, wherein the open area is absent disc material, wherein a center axis extends transversely through the open area, wherein in operation the friction disc is rotatable about the axis, wherein the friction disc comprises an annular radially extending material area, wherein the material area extends radially intermediate of the outer circumferential area and the open area, wherein the material area comprises disc material, wherein the disc material of the material area comprises friction material, wherein the material area comprises a side surface, wherein the side surface comprises an inner annular side surface portion and an outer annular side surface portion, wherein the inner annular side surface portion is disposed intermediate of the outer annular side surface portion and the open area, wherein the outer annular side surface portion comprises a generally planar surface, wherein the generally planar surface extends generally transversely outward beyond the inner annular side surface portion, a separator disc having a size enabling operational engagement with the friction disc in a bell housing flywheel clutch arrangement, wherein the separator disc comprises a central open area, wherein the central open area is absent separator disc material, wherein the separator disc comprises an iron separator disc, wherein the separator disc comprises an outer circumference, wherein the separator disc comprises an annular separator material area of substantially uniform thickness radially extending from an inner circumferential area to the outer circumference, wherein the annular separator material area comprises a machine-generated coarse surface having a 250-270 micro finish, wherein in initial clutch operation the annular separator material area is only engageable with the generally planar surface.