Friction washer for limited slip differential clutch pack

A friction washer for a limited slip differential, the friction washer comprising:

• a disk body having first and second opposing surfaces;
• the first opposing surface defining a first contact plane and including recesses that extend into the disk body from the first contact plane such that only a portion of the disk body extends to the first contact plane;
• the second opposing surface defining a second contact plane and including recesses that extend into the disk body from the second contact plane such that only a portion of the disk body extends to the second contact plane;
• and
• the recesses that extend into the disk body from the first contact plane and from the second contact plane are defined by partial spherical;
• wherein the recesses that extend into the disk body from the first contact plane and from the second contact plane are defined as a plurality of part-spherical recesses, and at least some of the part-spherical recesses on the first opposing surface intersect one another and at least some of the part-spherical recesses on the second opposing surface intersect one another;
• and
• wherein the disk body includes an opening defining an inner periphery in the disk body, and the disk body further includes an outer periphery, and the part-spherical recesses that intersect one another on the first opposing surface are arranged as a plurality of groups, each of the groups includes a sub-set of the part-spherical recesses that intersect at least one of the other ones of the part-spherical recesses in the group to form a recess pathway on the first opposing surface that extends from the inner periphery to the outer periphery in which each of the part-spherical recesses in the group, other than any part-spherical recesses that intersect the inner periphery and the outer periphery, intersects the first contact plane at two spaced apart locations.