Double-row self-aligning roller bearing and device for supporting wind turbine generator main shaft
AssigneeNtn Corporation
InventorsNaoki Nakagawa, Masaharu Hori, Takeshi Maeda, Souichi Yagi, Mitsuo Sasabe, Nobuyuki Mori
Life of this patent
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Abstract
A double-row self-aligning roller bearing includes left and right rows of rollers, arranged between an inner race and an outer race. A raceway surface of the outer race represents a spherical shape and the rollers have an outer peripheral surface following the shape of the raceway surface of the outer race. The rollers of the left and right roller rows have respective lengths different from each other. Also, the left and right roller rows have respective contact angles different from each other.
Claims21
A double-row self-aligning roller bearing, which is used to support a main shaft of a wind power generator having a blade rotor mounted on the main shaft, comprising:
- an inner race;
- an outer race;
- left and right rows of rollers arranged between the inner race and the outer race, in which left and right bearing portions accommodating the left and right roller rows have respective load carrying capacities different from each other,
- wherein one of the bearing portions that is arranged remote from the blade rotor has a load carrying capacity higher than that of the other of the bearing portions that is arranged close to the blade rotor, and each of the rollers of the row in the bearing portion arranged remote from the blade rotor has a length greater than that of each of the rollers of the row in the bearing portion arranged close to the blade rotor.
A double-row self-aligning roller bearing, which is used to support a main shaft of a wind power generator having a blade rotor mounted on the main shaft, comprising:
- an inner race, an outer race and double rows of rollers arranged between the inner race and the outer race,
- the bearing being in its entirety being divided into left and right split bearing portions each comprising a split inner race, a split outer race and a single row of rollers, in which elements associated with a load or a life are differentiated between the left and right split bearing portions,
- wherein one of the bearing portions that is arranged remote from the blade rotor has a load carrying capacity higher than that of the other of the bearing portions that is arranged close to the blade rotor, and each of the rollers of the row in the bearing portion arranged remote from the blade rotor has a length greater than that of each of the rollers of the row in the bearing portion arranged close to the blade rotor.
Dependencies are inferred from the claim text.