Wet brake clutch

A braking system for a vehicle, comprising a clutch, the clutch comprising:

• a rotational axis;
• a clutch housing, arranged to be rotationally fixed relative to the vehicle and sealed to an axle shaft end;
• a clutch carrier arranged to be rotationally fixed to a first drive portion of the axle shaft end;
• a clutch pack comprising:
• a first plurality of clutch plates, rotationally fixed to the clutch housing;
• and
• a second plurality of clutch plates intermixed with the first plurality of clutch plates and rotationally fixed to the clutch carrier;
• and
• a piston for compressing the clutch pack to brake the axle shaft end;
• a ramp reaction plate comprising a first plurality of ball ramp grooves;
• and
• a plurality of balls disposed in the first plurality of ball ramp grooves, wherein:
• the piston comprises a second plurality of ball ramp grooves;
• the plurality of balls are disposed in the second plurality of ball ramp grooves;
• and
• rotation of the ramp reaction plate is arranged to displace the piston to compress the clutch pack to brake the axle shaft end;
• the clutch housing comprises an annular surface;
• and
• the ramp reaction plate contacts the annular surface when the ramp reaction plate is rotated and the piston is displaced.

A braking system for a vehicle, comprising a clutch, the clutch comprising:

• a rotational axis;
• a clutch housing, arranged to be rotationally fixed relative to the vehicle and sealed to an axle shaft end;
• a clutch carrier arranged to be rotationally fixed to a first drive portion of the axle shaft end;
• a clutch pack comprising:
• a first plurality of clutch plates, rotationally fixed to the clutch housing;
• and
• a second plurality of clutch plates intermixed with the first plurality of clutch plates and rotationally fixed to the clutch carrier;
• and
• a piston for compressing the clutch pack to brake the axle shaft end;
• a ramp reaction plate comprising a first plurality of ball ramp grooves;
• a plurality of balls disposed in the first plurality of ball ramp grooves;
• and
• a retention spring arranged to pull the one of the first plurality of clutch plates towards the ramp reaction plate when the ramp reaction plate is not rotated, wherein:
• the piston comprises a second plurality of ball ramp grooves;
• the plurality of balls are disposed in the second plurality of ball ramp grooves;
• and
• rotation of the ramp reaction plate is arranged to displace the piston to compress the clutch pack to brake the axle shaft end.