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,
• a rotatable ring, and
• a plurality of rolling elements located in a raceway chamber defined between the rings;
• an axially movable piston disposed between a housing and the rolling bearing, bearing axially against an axial contact surface of fixed ring, and comprising a radial plate with an inner periphery and an outer periphery, and housing sealing means made of resilient material to define a sealed piston cavity with the housing, the piston cavity being connected to a source of hydraulic fluid which may variably provide pressurized fluid in the cavity to axially move the piston;
• and
• a resilient biasing member exerting an axial preload onto an axial contact surface of the rotatable ring, the rolling bearing being able to axially move by the piston movement and then compressing the resilient biasing member that actuates a coupling member engaging plates;
• wherein
• at least one between the inner and the outer peripheries of radial plate of 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.