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US 11,598,369 B2Granted
Bearing device
AssigneeRigaku Corporation
InventorsYasuyuki Shimazaki, Shinichi Oya
Life of this patent
Estimating the term…
Abstract
Only an outer spacer (33) is cooled by an outer spacer cooling structure, thereby causing a temperature difference between an inner spacer (32) and the outer spacer (33). According to this temperature difference, an inner ring (37) of a bearing (31) is displaced relatively to an outer ring (38) in a direction in which a preload inside the bearing (31) decreases.
Claims7
A bearing device for supporting a rotating shaft by a plurality of bearings so that the rotating shaft is freely rotatable, comprising:
- an inner spacer arranged between respective adjacent bearings of the plurality of bearings so as to be in contact with an inner ring of each of the respective adjacent bearings;
- an outer spacer arranged between respective adjacent bearings of the plurality of bearings so as to be in contact with an outer ring of each of the respective adjacent bearings;
- and
- a device main body which accommodates the plurality of bearings, the inner spacer and the outer spacer therein, wherein a first refrigerant flow path for cooling the plurality of bearings is formed in the device main body, a second refrigerant flow path for cooling the outer spacer are formed in the device main body, and the first and the second refrigerant flow paths are configured to communicate with each other and circulate refrigerant therethrough,
- wherein the first refrigerant flow path has a spiral hollow portion defined by a first concave groove formed on the device main body, the second refrigerant flow path has a hollow portion defined by a second concave groove formed in the outer spacer, and a part of refrigerant flowing through the spiral hollow portion defined by the first concave groove is supplied into the hollow portion defined by the second concave groove.
2 more elements
Dependencies are inferred from the claim text.