| 摘要 |
PROBLEM TO BE SOLVED: To provide a tappet roller bearing structure suppressing wear of a contact part by idealizing rotation of two rollers, in a double roller type tappet roller bearing. SOLUTION: This tappet roller bearing structure includes: an inside diameter side cylindrical roller 12 fitted on the peripheral surface of a supporting shaft 6; and an outside diameter side cylindrical roller 13 fitted on the peripheral surface of the inside diameter side roller 12. The structure satisfies R<SB>a1</SB><R<SB>a2</SB>where R<SB>a1</SB>represents the sum of the surface roughness of the peripheral surface of the supporting shaft 6 and the surface roughness of the inner peripheral surface of the inside diameter side roller 12, and R<SB>a2</SB>represents the sum of the surface roughness of the peripheral surface of the inside diameter side roller 12 and the surface roughness of the inner peripheral surface of the outside diameter side roller 13. COPYRIGHT: (C)2008,JPO&INPIT
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