A bearing housing (1) is fabricated with a bearing body (2) for holding a bearing (3); and a sealing member (4). The sealing member has a shaft insertion (6) for inserting a shaft into the bearing housing (1). The sealing member (4) is formed with a spherical outer surface (4a) which is movable in contact with the bearing housing body (2), and the sealing member (3) rests on the bearing (3) when installed in the bearing housing body (2). A circular opening (6) extends between a front-end circular opening (45) and a back-end circular opening (46), such that the back-end (42) is connected to the front-end (41) by a spherical structure (44).

A description is provided of a planetary gear comprising a sun rotatable around a first axis, a crown angularly fixed with respect to the first axis; two satellites that are meshing, rotatable around respective second axes; a satellite carrier rotatable around the first axis and comprising at least two first pins with respect to which the satellites are rotatable around respective second axes; and a plurality of bearings comprising: a first ring defining a first raceway that is at least partially spherical; a second ring defining a second raceway; and a plurality of rolling bodies shaped as an hourglass rolling on the first spherical raceway and a second raceway; each rolling body being in contact with the raceways at a line with axial ends lying on respective straight lines tilted between them and converging in a point lying on a median plane of the rolling body and on the second axis; the straight lines define a first angle, whose bisector lies on the first median.

A bearing arrangement utilizing a typical lip seal pressed into a bore to act as a reacting spring surface which keeps a bearing outer race preloaded to prevent unintentional bad bearing operation (e.g., outer race spinning or ball sliding). This spring reacting surface serves to discourage, for example, outer race spinning or ball sliding, packaged in a tight, space efficient location to permit critical space to be used for other functions. Aspects include retention feature for retaining a biasing element in the bore prior to assembly.