pplications in which the loads are light and the service relatively unimportant. a simple ,easily installed bearing is required ,suing little or no lubrication. In such cases an antifriction bearing might be a poor answer because because of the cost, the close ,the radial space required ,or the increased inertial effects. Recent metallurgy developments in bearing materials , combined with increased knowledge of the lubrication process, now make it possible to design journal bearings with satisfactory lives and very good reliabilities.РРРРРРРРРРreferenceР[1] sikong L,Hashimoto H,Ashima S. Breakage behavior of fine particles of brittle minerals and coal. power technology,1990. Р[2] kanda Y, sano Y,Yashima Y﹒A consideration of grinding limit based on frachure mechanics﹒Power technology,1986﹒