| 摘要 |
PROBLEM TO BE SOLVED: To provide a cross roller bearing capable of correctly positioning a plug relative to a roller insertion hole opened in an inner ring without driving a pin. SOLUTION: A plug 9 is fixed in a roller insertion hole formed in an inner ring 3 of a cross roller bearing 1. Right and left flat parts 81, 82 and a semi-circular recessed part 83 which is smoothly continuous thereto are formed on an inner circumferential surface of the roller insertion hole. Flat parts 91, 92 closely attached to the flat parts 81, 82 and a semi-circular projecting part 93 closely attached to the recessed part 83 are formed on an outer circumferential surface of the plug 9. When the plug 9 is fitted in the roller insertion hole, each part is closely attached to automatically position the plug 9 in the radial direction and the direction orthogonal thereto. The plug need not be fixed using a positioning pin, etc.
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