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For a bearing mounted between two concentric races rotating relative to each other, and forming an annular gap that accommodates the bearing and is closed by seals, at least one grease tube is provided between the periphery of one of the two races and the annular gap, and is connected to a correspon

For a bearing mounted between two concentric races rotating relative to each other, and forming an annular gap that accommodates the bearing and is closed by seals, at least one grease tube is provided between the periphery of one of the two races and the annular gap, and is connected to a corresponding grease reservoir. At least one main grease tube opens into the annular gap in an angular sector where an overpressure occurs, a corresponding main grease reservoir is adapted to collect grease flowing from the annular gap through the main grease tube due to the overpressure that may occur within the annular gap in the angular sector.

대표청구항 ▼

What is claimed is: 1. 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 axi

What is claimed is: 1. 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. 2. The turbine of claim 1, wherein said at least one main grease tube being placed in a region located substantially around a radius parallel to the wind direction. 3. The turbine of claim 1, further comprising two main grease tubes symmetrically arranged to one other with respect to the rotational axis. 4. The turbine of claim 1, further comprising at least one complementary grease tube opening into the annular gap within said complementary angular sector and each said complementary grease tube being connected to a corresponding complementary grease reservoir for distributing grease within the annular gap. 5. The turbine of claim 4, wherein said at least one complementary grease tube being placed in a region located substantially around a radius parallel to the wind direction. 6. The turbine of claim 4, further comprising two complementary grease tubes symmetrically arranged to one other with respect to the rotational axis. 7. The turbine of claim 4, further comprising ducts connecting together, said at least one complementary grease tube and said at least one main grease tube, and means for transferring excess grease from said main angular sector towards said complementary angular sector through said ducts. 8. The turbine of claim 7, wherein each said complementary grease reservoir and each said main grease reservoir is deformable. 9. The turbine of claim 7, wherein at least one of the complementary grease reservoir and the main grease reservoir includes at least one bellows so as to be deformable. 10. The turbine of claim 7, wherein at least one of the complementary grease reservoir and the main grease reservoir is made of a pocket of flexible material. 11. The turbine of claim 7, wherein each complementary grease tube and each main grease tube is realized through the outer one of the races which is fixed to the rotor. 12. The turbine of claim 1, further including a lubricating device connected to at least one lubricant tube for injecting grease into the annular gap. 13. The turbine of claim 1, further comprising a mast, said stator being rotatably mounted on said mast through a set of stator bearing races so that the rotational axis is oriented substantially permanently along the driving fluid direction, said set of stator bearing race comprising a second set of concentric races rotation relative to each other, and forming a second annular gap that accommodates a stator bearing, said second annular gap being filled with grease and being closed by seals. 14. The turbine of claim 13, wherein said two races of said set of stator bearing races includes a second fixed race and a second moving race, the second moving race being subject to asymmetrically stresses directed towards a second main region of the second fixed race, at least one additional main grease tube opening into said second annular gap within a second main angular sector surrounding said second main region and being connected to a corresponding additional main grease reservoir, for collecting grease flowing from the second annular gap through said at least one additional main grease tube because of an overpressure occurring within the second annular gap in said second main angular sector. 15. The turbine of claim 14, further comprising at least one additional complementary grease tube opening into the second annular gap in a second complementary angular sector substantially diametrically opposed to the second main angular sector, and each said additional complementary grease tube being connected to a corresponding additional complementary grease reservoir for distributing grease within the second annular gap. 16. The turbine of claim 15, further comprising additional ducts connecting together, said at least one additional complementary grease tube and said at least one additional main grease tube, and means for transferring excess grease from said second main angular sector towards the second complementary angular sector through said additional ducts. 17. The turbine of claim 16, wherein each said additional complementary grease reservoir and each said additional main grease reservoir is deformable and wherein at least one of the additional complementary grease reservoir and the additional main grease reservoir includes at least one bellows so as to be deformable. 18. The turbine of claim 16, wherein at least one of the additional complementary grease reservoir and the additional main grease reservoir is made of a pocket of flexible material. 19. The turbine of claim 14, further including a second lubricating device connected to at least one additional lubricant tube for injecting grease into the second annular gap.