Abstract: A friction part includes a friction surface with a first friction zone, a second friction zone, and a first circumferentially extending groove band separating the first friction zone from the second friction zone in a radial direction. At least one dimension of the first friction zone, the second friction zone, or the first circumferentially extending groove band is optimized with respect to a cooling behavior of the frictionally operating device. In an example embodiment, the friction surface has a third friction zone and a second circumferentially extending groove band separating the second friction zone from the third friction zone. The first friction zone is a radially innermost friction zone and a first radial dimension of the first friction zone is approximately 1 to 2 times a sum of a second radial dimension of the second friction zone and a third radial dimension of the third friction zone.

Abstract: A friction plate for a wet multiplate clutch includes a carrier element and a friction lining. The friction lining is adhesively bonded to the carrier element, is formed of friction lining pieces, and includes at least four annular sectors. A first one of the at least four annular sectors has a first groove pattern. A second one of the at least four annular sectors has a second groove pattern, different than the first groove pattern.