| 摘要 |
PROBLEM TO BE SOLVED: To substantialize low torque without deteriorating the rigidity of a bearing. SOLUTION: The tapered roller bearing comprises an inner ring 2, an outer ring 3, a plurality of tapered rollers 4 which are disposed between the inner ring 2 and the outer ring 3 and is capable of freely rolling the between those rings, and a retainer 5 circumferentially holding the tapered rollers 4 thereon at specified intervals. The roller factor is set to exceed 0.94. An infinite number of micro recessed dents are formed, at random, at least in the surfaces of the tapered rollers 4, a surface roughness parameter Ryni for the surface in which the dents are formed is set within the range of 0.4μm≤Ryni≤1.0μm, and an Sk value is set to -1.6 or less. The retainer 5 comprises a small annular part 6 continuously formed on the small end face side of the tapered rollers 4, a large annular part 7 continuously formed on the large end face side of the tapered rollers 4, and a plurality of column parts 8 connecting the large and small annular parts 6, 7 to each other. Tapered faces 8a contacting a rolling face of the rollers 4 are formed on both sides of the inner-diameter face of the column parts 8. A length L of the tapered face 8a in the width direction is 5% or more and less than 11% of the average diameter of the rollers 4. COPYRIGHT: (C)2007,JPO&INPIT
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