| 摘要 |
PURPOSE:To improve lubrication performance of a portion which makes slide contact and rolling contact by a method wherein work grains in a direction crossing a relative movement direction approximately at right angles are formed on the surface of the contact part of at least one of a pair of bearing parts. CONSTITUTION:Work grains 15 in a direction, i.e., an axial direction, crossing the relative movement direction of a roller 4 based on an inner ring 2 are formed on the track surface 13 of the inner ring 2. By forming the working grains 15, it is considered that a lubricant is stowed in a belt-like manner in a recess part between protrusion parts. Thus, the protrusion crossing the relative movement direction approximately at right angles prevents outflow of a lubricant, stowed in the recess parts of a mating member, to the outside of a contact part. Since the lubricant in the recess part is stowed and held in the contact part, an amount of the lubricant located in the contact part is increased, resulting in the increase of the thickness of the oil film of the contact part. |
