Sealed clutch thrust bearing device and driveline system including such a device

A clutch thrust bearing device comprising:

• a rolling bearing having a fixed ring and a rotatable ring, the fixed ring having an axial contact surface,
• a plurality of rolling elements located in a raceway chamber defined between the fixed ring and the rotatable ring;
• an axially movable piston configured to be disposed between a housing and the rolling bearing, the axially movable piston bears axially against the axial contact surface of the fixed ring, the axially movable piston comprising a radial plate with an inner periphery and an outer periphery thereof, the axially movable piston having a housing sealing means made of resilient material that is configured to define a sealed piston cavity with the housing, the piston cavity being connected to a source of hydraulic fluid configured to provide pressurized fluid in the cavity to axially move the axially moveable piston;
• and
• a resilient biasing member exerting an axial preload onto an axial contact surface of the rotatable ring, the rolling bearing being adapted to move along an axial direction with the axially movable piston, the axial movement of the rolling bearing compressing the resilient biasing member;
• wherein
• at least one of the inner periphery and the outer periphery of the radial plate of the axially movable piston is provided with a bearing sealing element of resilient material having at least one sealing lip in sliding contact with the rotatable ring of rolling bearing.