Machine parts having minute random recesses
AssigneeNtn Corporation
InventorsKenji Hibi, Toshihide Goto
Life of this patent
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Abstract
A machine part having a rolling or sliding surface formed with a plurality of minute recesses at random with the SK value less than zero in both the longitudinal and circumferential directions, and the area ratio of the recesses to the whole rolling surface being 10-40 percent.
Claims5
A machine part having a rolling surface adapted to make a rolling contact, said rolling surface being formed with a plurality of minute recesses at random, a SK value being less than zero both in the longitudinal and circumferential directions, and the area ratio of said recesses to the whole rolling surface being 10-40 percent, said SK value representing skewness of a distribution curve showing surface roughness in the longitudinal and circumferential directions.
A machine part having a sliding surface adapted to make a sliding contact while bearing a load, said sliding surface being formed with a plurality of minute recesses at random, a SK value being less than zero both in the longitudinal and circumferential directions, and the area ratio of said recesses to the whole sliding surfaces being 10-40 percent, said SK value representing skewness of a distribution curve showing surface roughness in the longitudinal and circumferential directions.
Dependencies are inferred from the claim text.