円すいころ軸受ころ大端面の最適曲率半径(機械要素,潤滑,設計,生産加工,生産システムなど)

概要

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Tapered roller bearings can support heavy combined radial and thrust loads, and are widely used for automobiles, railcars and industrial machines. The bearings have an inner ring rib into which roller large ends are thrust, and the contacts are accompanied with rolling-sliding motion. The roller large end and the rib surface are spherical and conical in shape, respectively. The typical lubrication regime of the contact is elastohydrodynamic lubrication (EHL), however, some surface damage may occur if the oil film formation is not enough due to low-rotational and/or heavy-load operations. The film thickness is desired to be thick enough to prevent the damage in a given operating condition. In this paper, an EHL numerical model is developed in consideration of both asperity contact and roller skewing. A parameter study shows that the optimum radius of the roller large end face is about 85% of that of the rib face conical surface to form thicker oil films.
2009-08-25