Compact multi-function clutch

A clutch comprising:

• a housing;
• an output shaft rotatably supported within the housing;
• an input drive portion configured for selective connection to the output shaft through a clutch pack for mutual rotation about a central axis, wherein the input drive portion includes a friction disc and a torsional coupling configured to damp torque pulses and drive the friction disc, wherein the torsional coupling includes an output member driven through one or more elastic members and fixedly secured to the friction disc;
• a bearing supporting the output member of the torsional coupling on the output shaft, wherein the torsional coupling of the input drive portion and the bearing lie in a shared reference plane that extends perpendicular to the central axis;
• a clutch actuation fluid chamber in the housing, wherein a pressure plate of the clutch pack is configured for selective actuation to an engaged position that engages the clutch pack in response to fluid pressure in the clutch actuation fluid chamber;
• and
• a brake reaction disc selectively engageable by the pressure plate when the pressure plate is biased from the engaged position to a released position, wherein the brake reaction disc is movable from a disabled position to an enabled position in response to fluid pressure in a brake enable fluid chamber.

A clutch comprising:

• an end plate;
• a housing;
• a clutch actuation fluid chamber in the housing containing a movable clutch piston;
• a pressure plate movable between a release position and an engaged position, the pressure plate having a clutching surface and a braking surface opposite the clutching surface, wherein the pressure plate is secured for rotation about a central axis with the end plate and an output shaft;
• a friction disc positioned between the end plate and the clutching surface of the pressure plate and selectively clamped therebetween to engage the clutch, wherein the pressure plate is urged by a first bias member away from the end plate and the friction disc to the release position, and the pressure plate is configured for selective actuation to the engaged position in which the bias member is overcome in response to fluid pressure on the clutch piston;
• and
• a brake reaction plate positioned adjacent the braking surface of the pressure plate, the brake reaction plate having an enabled position and a disabled position, the brake reaction plate being biased by a second bias member to the disabled position,
• wherein, in the enabled position, the brake reaction plate is positioned to selectively receive the braking surface of the pressure plate in its release position to apply braking force configured to stop rotation of the pressure plate, the end plate, and the output shaft, and
• wherein, in the disabled position, the brake reaction plate is positioned away from the braking surface of the pressure plate in its release position to avoid applying braking force to the pressure plate.