A new test rig is used to investigate the mode of lubrication of tapered roller bearings under axial loading. Two different bearing configurations for a 21/4-in shaft are used. The lubricants are mineral oils. The investigation establishes the nature of the lubrication at the load-carrying points in the bearing, at the inner and outer rings, and at the flange on the inner ring. Measurements of friction losses are made over a wide range of operating conditions; these are analysed theoretically, and are substantially accounted for by modern lubrication theory and a detailed consideration of the geometry of the bearings as a whole.
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