| 摘要 |
PROBLEM TO BE SOLVED: To provide a cage for a needle roller bearing which can suppress wear even at high-speed rotation and in a lean lubricant atmosphere, and can smoothly rotate without causing seizure, and the needle roller bearing which exhibits excellent durability even at the high rotation and in the lean lubrication atmosphere.SOLUTION: A cage for a needle roller bearing for rotatably supporting a planetary gear of a planetary gear mechanism has an annular part and a plurality of columns extending to an axial line direction from the annular part, holds rollers between the adjacent columns, and is used by the guide of an outer ring. A combined coating containing phosphate and a solid lubricant which is selected from a soft metal-system solid lubricant and a laminar crystal structural substance, or a combined coating containing phosphate and a phosphoric acid compound which includes soft metal is formed at least at an external peripheral face. |
