| 摘要 |
PROBLEM TO BE SOLVED: To improve durability by reducing sliding resistance between an outer peripheral surface of an inner diameter side roller 8 and an inner peripheral surface of an outer diameter side roller 9, and restraining abrasion of these respective peripheral surfaces. SOLUTION: Surface treatment layers 10 and 10a for reducing friction are formed on a surface of both rollers 8 and 9. Among both these surface treatment layers 10 and 10a, surface roughness of a part positioned on the outer peripheral surface of the inner diameter side roller 8 and the inner peripheral surface of the outer diameter side roller 9 is set to 0.02 to 0.20 Ra. The problem is solved by forming a lubricating oil film having sufficient strength over the whole periphery between both mutual peripheral surfaces by adopting this constitution. COPYRIGHT: (C)2005,JPO&NCIPI
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