abstract |
PROBLEM TO BE SOLVED: To provide a rolling bearing unit for supporting a wheel which prevents frictional wear on a bearing lubrication surface under high speed and high load and has excellent long-term durability. A stationary bearing ring that is supported and fixed to a suspension device in use, a rotating bearing ring that supports and fixes a wheel in use, and the stationary bearing ring and the rotating bearing ring face each other. A wheel comprising a plurality of rolling elements provided between a stationary transfer surface and a rotating transfer surface existing on a peripheral surface, and lubricating a rolling contact portion between each of the transfer surfaces and each of the rolling elements with grease. In the supporting rolling bearing unit, the grease contains a base oil, a thickener, and inorganic bismuth, and the inorganic bismuth is blended in an amount of 0.01 to 15% by weight based on the whole grease. [Selection] Figure 1 |