IPC Definitions - January 01, 2012
F16H 48/295 - Definition
This group covers:
Differentials, in which the engaging power of a pilot clutch is amplified by using a cam, for example, and thereby, to have a main clutch engaged (see "pilot clutch 33","cam mechanism 35" and "main clutch 39" in the figure below).
(US 6436002 B1)