| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tapered roller bearing, capable of exhibiting high oil film forming capability even in high-speed rotation with a severe lubricating environment, and improving the bearing life. <P>SOLUTION: A clearance part A having a radial space Y is formed between the inner circumference of a minor diameter-side end part 4b of a retainer 4 and a small collar part 2b of an inner ring 2. A rolling surface 3a of a tapered roller 3 is finely roughed by randomly forming an infinite number of fine dents of recessed shape on the rolling face 3a. In the finely roughed surface, the surface roughness parameter Ryni of the face having the dents is 0.4μm≥Ryni≥1.0μm, and the Sk value is -1.6 or less. Each surface roughness of a raceway face 1a of an outer ring 1 and a raceway face 2a of the inner ring is set less than 2 times the surface roughness of the rolling face 3a of the tapered roller 3. The tapered roller bearing having the above-mentioned structure is used in a condition in which the oil film parameter Λ is 0.5 or more. <P>COPYRIGHT: (C)2008,JPO&INPIT |
