Koyo Seiko Company, Ltd.

Yasuaki Nagai

Masamichi Shibata

Kenji Asano

Kenji Shitsukawa

There is provided a roller bearing in which contact stress between a roller and a raceway is uniformized by optimizing a configuration of a clearance between the roller and the raceway. A configuration of an outer circumferential surface (,) of a tapered roller (,) of a tapered roller bearing (,) is defined so that a clearance of Y(x)&equals;kYp(x), which results from multiplying an equation Yp(x) for uniformizing contact stress between infinite-width plate and tapered roller by a positive number k&equals;1.5-10, is formed between the raceway surface (,) and the outer circumferential surface (,) of the tapered roller (,). The tapered roller (,) relaxes concentration of contact stresses, improving the durability.

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Kashiwara, Japan

Yasuaki Nagai