A Ball Ramp Driveline Clutch Actuator Having Unidirectional Application Using Planetary Gearset

Abstract: A vehicle driveline clutch using a ball ramp actuator (5) supplying a clamping force on a clutch disc(10,11)in response to an electomagnetic field where the clutch clamping force is maintained and increased with clutch slip using a plurality of one-way clutches(44A,44D,45A,45D)acting in a pair of planetary gearsets(21A,21B)with a one-way cliutch acting on each planet gear and supported on a carrier ring(39)which is fictionally connected to a ball ramp control ring(14)upon energization by a clutchcontrol unit(15)of an electricalcoil(30)thereby creating relative rotational motion between the contriol ring(14)and an actuation ring(12)causing a plurality of rotational elements 20A-20C to travel along identical opposed variable depth ramps(23A-23C)thereby creating an axial separation force between the control ring(14)and the actuation ring(12)generating the clamping force on the clutch disc.Upon slippage of the clutch disc,the first and second planetary geasrets(21A,21B)acting in concert with the one-way clutches to further energize the ball ramp actuator(5)to increase the clutch clamping force when the vehicle is in either a drive or coast driving mode.

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