NEEDLE BEARING, SHAFT, COMPRESSOR FOR CAR AIR-CONDITIONER, AND PLANETRARY GEAR MECHANISM FOR AUTOMATIC SPEED CHANGER

摘要

In thrust needle bearings 16A and 16B, radial needle bearings 15A and 15B, and a shaft 14, each part is treated to have a nitrogen concentration of 0.3 weight % or more, and a Vickers hardness of Hv = 653 to 832. Therefore, abrasion of the contacting portions is minimal, and it is possible to suppress premature abrasion, and extend the life, even if used under severe lubrication conditions.