Patent ID: 6991378

Claim:
A turbine driven by a fluid, comprising a stator, a rotor mounted on the stator so as to rotate about a rotational axis which is oriented substantially permanently along a direction of the driving fluid, and blades mounted on the rotor so as to rotate about a longitudinal axis of the blade through sets of bearing races, each set of bearing races comprising two concentric races rotating relative to each other, and forming an annular gap that accommodates the bearing, said annular gap being filled with grease and being closed by seals, a first race of the races attached to the blade being subject to asymmetrical stresses oriented along the direction of the driving fluid towards a main angular sector of a second race of the races, at least one main grease tube opening into the annular gap within said main angular sector, each said main grease tube being connected to a corresponding main grease reservoir for collecting grease flowing from the annular gap through said at least one main grease tube because of an overpressure occurring within the annular gap at said main angular sector and of a depression occurring within the annular gap at a complementary angle sector which is substantially diametrically opposed to said main angular sector, said main angular sector being either a downstream region if the inner one of the races is fixed to the blade, or an upstream region if an outer one of the races is fixed to the blade.