Pressure compensating device for a bearing housing

A pressure compensating device for a bearing housing, which is incorporating a compartment sealed off by seals, and which device is intended to compensate pressure variations in the sealed off compartment, the device comprising a housing, in which is positioned a deformable bellows having an ability to change its form, the housing comprising at least one first opening through which an interior of the bellows communicates with a side of the bearing housing where a varying pressure is expected, and the bellows further being associated with an additional opening adapted to allow the bellows to alter its momentary form for compensating such pressure variations;

• wherein the housing of the device incorporates an axially extending outer rim and a hub portion interconnected with the rim via a planar annular web of smaller axial size than the rim, and an annular trough-shaped channel provided between the rim and hub member, the annular trough-shaped channel forming said additional opening and being adapted to receive the flexible bellows.