BEARING DEVICE FOR MACHINE TOOL MAIN SPINDLE

摘要

PROBLEM TO BE SOLVED: To suppress a rise in temperature and an heat expansion of an angular contact ball bearing fitted in a housing by releasing heat thereof to the housing while maintaining the amount of looseness of the angular contact ball bearing.

SOLUTION: Heat conductive grease 3 containing inorganic powder as a heat conductive material is placed between each outer ring 2a of the combination angular contact ball bearing 2 loosely fitted in the housing 12 and the inner diameter surface of the housing 12, whereby the heat of the combination angular contact ball bearing 2 is released from each outer ring 2a to the housing 12 through the heat conductive grease 3. It is thus possible to suppress a rise in temperature and heat expansion of the angular contact ball bearing 2 with the amount of looseness of fitting of the angular contact ball bearing 2.

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