With choice of rolling bearings

Choose to cooperate on the basis of according to the load acting on the bearing relative to the rotation of the ring, there are three kinds of bearing ring under the load: local load and cyclic load, the load swing. Cyclic loading (usually Rotating load) Use tight fit, oscillating load; Local load in addition to have special use requirements, should not be commonly use tight fit. When the bearing ring under the dynamic load and heavy load, both inner and outer ring should use interference fit, but sometimes the outer ring can be a little loose, should be able to swim in the hole for the axial bearing shell; When the bearing ring oscillation under load and load is lighter, can use a little loose than tight fit. Load bearing ring and shaft size or the magnitude of the interference between the shell hole depends on the size of the load, load is heavier, the use is greater than surplus quantity to cooperate; Load lighter, will use the surplus quantity more transgressions. General radial load P < 0. 7 c as a light load, P is greater than zero. 7 c and is equal to or less than zero. 15 c as normal load, P is greater than zero. 15 c is heavy load, C rated dynamic load of bearings) 。 Working temperature bearing during operation, the temperature of the ring is often higher than the temperature of the adjacent parts, therefore, the bearing inner ring may be due to thermal expansion and the looseness of the shaft of the outer ring may be affected by thermal expansion bearing hole in the shell axial winding. Help choosing cooperate, temperature difference, expanding the bearing assembly of parts drop-off should be taken into account, when the temperature difference is big, choose the axis and the inner ring with thrown some interference. Rotation accuracy of bearing high rotating accuracy requirement, for the elimination of the influence of elastic deformation and vibration, should avoid to use clearance fit. The structure and material of bearing shell holes to form shell hole, when combined with the bearing outer ring is unfavorable use interference fit, should not to rotate the outer ring hole in the shell. For installation in thin-walled shell hole, hole or hollow shaft bearing, light metal shell should be used than thick wall hole hole, cast iron shell or solid shaft tighter fit. Convenient installation and disassembly for heavy machinery, bearing the appropriate USES loose fit. When need to adopt tight fit, can choose separation type bearings, inner ring with taper hole and with tight sleeves or withdrawal sets of bearings. Bearing axial displacement coordination, when asked a ring of bearing axial moving in operation, and the bearing outer ring and bearing shell hole loose fit should be adopted. With the selection of the bearing with the shaft with the use of hole system, while cooperate with shell adopts the basic shaft system. Bearings and shaft and machine manufacturing tolerance matching system, adopted by the bearing inside diameter tolerance zone more change in the following, as a result, under the condition of the same coordinate, bearing inside diameter and axial mixture ratio is usually cooperate more closely. Bearing outside diameter tolerance zone and the system of basic shaft axis of tolerance zone even in with below zero, but its value and general tolerance system is not the same.