| 摘要 |
PROBLEM TO BE SOLVED: To obtain a structure capable of preventing the occurrence of a pressure difference between a rolling element arranging space 16 and an external space, even if the bearing temperature changes, in the structure for fluid-tightly blocking up mutual end surfaces in the axial direction of both inner ring elements 11 and 11 by a seal ring 7 installed in a recessed groove 18, by forming the recessed groove 18 on an inner peripheral surface of a butting part of the mutual end surfaces in the axial direction of a pair of inner ring elements 11 and 11. SOLUTION: The seal ring 7 is constituted by combining an annular ring-shaped sealant and an annular ring-shaped or segmental annular ring-shaped core material for reinforcing the sealant. Among these, the sealant is made of a water repellent-oil repellent, ventilating and flexible raw material. In a state of installing the seal ring 7 in the recessed groove 18, the sealant is respectively contacted at an interference over the whole periphery with both sidewall surfaces in at least the axial direction among an inner surface of the recessed groove 18. The problem is solved by adopting such a constitution. COPYRIGHT: (C)2010,JPO&INPIT
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