Driveline clutch with unidirectionally applied ball ramp

摘要

A ball ramp mechanism (11) having a control ring (14) acting with an actuation ring (12) to apply a clamping force on a driveline clutch (2) during both a vehicle driving mode and a vehicle coast mode using a planetary gearset (39) acting with a one-way clutch (46) between a sun gear (40) and meshing planetary gears (42) to define rotation of the control ring (14) with respect to the actuation ring (12) in a direction tending to further activate the ball ramp mechanism (11). In the vehicle drive mode the planetary gearset (39) is locked by the one-way clutch (46) and in a vehicle coast mode the one-way clutch (46) releases and the planetary gearset (39) rotates the control ring (14) through a coil pole (30) in a direction to further activate the ball ramp mechanism (11).