Koyo Seiko Company, Ltd.

Yasunari Abo

Akiyuki Suzuki

Hiroki Matsuyama

In order to improve a seizure resistance as well as restricting of a dispersion of a rotation torque, surface roughness of a large diameter side end face (A) of a tapered roller () is defined as a value satisfying both the following conditional expressions (1) and (2).0.04 &#x3bc;m&#x2266;()&#x2266;0.1 &#x3bc;m&#x2003;&#x2003;(1)0.8&#x2266;()/()&#x2266;1.1&#x2003;&#x2003;(2)where, Ra(r) is an arithmetic average of roughness in a radial direction on the large diameter side end face of the tapered roller, and Ra(c) is an arithmetic average of roughness in a peripheral direction on the large diameter side end face of the tapered roller.

Roller bearing, transmission using the same and differential gear

The present invention provides a roller bearing in which a plurality of rollers is interposed between an inner ring member and an outer ring member, and a flange having a guide surface for guiding an end surface of the roller in a sliding contact manner is provided at an end portion of at least one of the inner ring member and outer ring member in an axial direction. Three-dimensional surface roughness of the end surface of the roller is defined to a value which satisfies conditional expressions of Sa&lE;0.1 &mgr;m and 0.15 &mgr;m&lE;Svk&lE;0.30 &mgr;m, where Sa is arithmetical average roughness based on rough curve and Svk is reduced valley depth based on the rough curve.

Roller bearing

A tapered roller bearing in which tapered rollers are interposed between an inner ring member and an outer ring member and a large diameter flange having a guide surface guiding a large diameter side end face of a tapered roller is provided in an end portion in an axial direction of the inner ring member. Microscopic streaked grinding trails are arranged in multiple directions on the large diameter side end face of the tapered roller.

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Kitakatsuragi-gun, Japan

Yasunari Abo