| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a planetary gear mechanism improving lubrication while securing load capacity of a needle roller bearing. <P>SOLUTION: The cross sectional area of a discharge hole 4x is made larger than the cross sectional area of a discharge hole 4y, so that when lubricating oil is supplied to a central hole 4f from a right end of a pinion shaft 4e, the lubricating oil amount to rollers 11a, 11b is kept well balanced by increasing the diameter of the discharge hole 4x, to which the distance from an oil feed port of the central hole 4f is far and the lubricating oil is hard to reach. Biasing of lubrication as a whole is thereby prevented without deteriorating reliability and strength, heat generation of the needle roller bearing 10 is suppressed, and high speed and a long service life are achieved. <P>COPYRIGHT: (C)2009,JPO&INPIT |
