| 摘要 |
PROBLEM TO BE SOLVED: To retain lubricating grease appreciably over rolling bearing parts even under various operating conditions of equipment such as rotary electrics, by changing a outflow preventing ring in dependence on the variation. SOLUTION: A housing 2 for retaining a rolling bearing 1 has a feed passage 26 opening onto one axial end of the rolling bearing 1, a drain chamber 27 with an annular groove 4 connecting to the other axial end of the rolling bearing 1, and a drain port 28 opening onto the drain chamber 27. The annular groove 4 is removably fitted with an outflow preventing ring 5 that faces the other axial end of the rolling bearing 1 to prevent lubricating grease fed to the rolling baring 1 from outflowing into the drain port 28 or retain it over the rolling bearing 1.
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