| 摘要 |
PROBLEM TO BE SOLVED: To maintain excellent processing precision by preventing occurrence of thermal displacement due to a cooling route. SOLUTION: A bearing housing 2 is composed of an inner hosing 8 for holding a bearing row 4, an outer housing 9, and a sleeve 11. Between the inner housing 8 and the outer housing 9, and also between the sleeve 11 and the outer housing 9, a spiral outward-going route 12 and a returning route 13 are formed respectively, with both of their front ends connected with each other through a connection hole 14. Furthermore, at the rear side of the outer housing 9, a supply route 15, which is connected with the rear end of the outward-going route 12, and a recovery route 16, which is linked with the rear end of the return route 13, are formed individually.
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