The most common bearing materials consist of Since these factors cannot all be obtained to a desirable degree in a single material, it is necessary in practice to make a compromise. high thermal conductivity and of course,.Amongst these we must include such factors as The material of the shaft or journal is established from considerations of strength and rigidity, and will invariably be steel.īecause the conditions under which bearings must operate in service may vary over a wide range, it is necessary that bearing materials be used which have certain desirable properties. Separating these two elements is the lubricant, introduced, generally in the case of sugar mills, by external pressure feeding. The bearing or bearing material is located in a housing or structure, and may or may not be integral with it. The two essential elements in a plain bearing are the bearing or bearing material itself, and the shaft or moving member. Standard sugar mill practise limits the bearing pressure to about 10 MPa. The bronzes that are common in sugar mills have a recommended maximum bearing pressures of up to 100 MPa for phosphor bronze and 50 MPa for tin-bronzes. The maximum pressure that a bearing can withstand is mainly a function of the bearing material.
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