Motor bearing radial clearance and how positioning control is good?

Bearing the radial clearance of how to control the bearing internal clearance is one of the bearing ring relative to the other bearing ring in radial or axial movable total distance. For the bearing clearance, must distinguish between the initial clearance before installation, and after installation and achieve its working temperature of the clearance. The bearing initial clearance generally larger than the working clearance, is due to different interference quantity tolerance matching, and bearing ring and its adjacent components are different degrees of thermal expansion, leading to ring expansion or compression. To make motor bearing can run well, radial clearance is very important, which requires in accordance with the actual characteristics of the motor and operating conditions, choose appropriate bearing to match. Bearing is the general principle of operation, the ball bearing work clearance should be zero or slightly preloaded; But for cylindrical roller bearing, the operation must have certain residual clearance. Under normal working conditions, select the general set of bearing clearance, you can get a suitable job clearance. But when working and installation conditions and generally have distinction, such as the bearing inner ring and outer ring is interference fit, or, inner ring and outer ring temperature difference effect, should choose big or small clearance than normal group of bearings. Bearing radial positioning and control points in the process of the actual bearing selection, some motor manufacturer is used to select larger bearings, bearing load bearing noise problems can often again, especially some motor, the no-load running bearing noise is bigger, the belt carrying row voice is very good, the problem may be improper choice has a certain relationship with the bearing, the bearing has the ideal axial positioning, is necessary for bearing a good run. From the characteristics of the function of bearing analysis, to reach the bearing capacity of bearing used completely, the bearing inner and outer circle of the circumference of a circle, or thrust bearing axial ring and seat, must be strong and uniform bearing completely. Bearing surface can be cylindrical or conical surface, for the shaft of the thrust bearing ring and seat, the application of a flat surface. To match the bearing ring surface processing, therefore, must meet the precision, and should not be any groove, hole, or other discrete form. Besides, bearing ring must be securely fixed to prevent under the effect of load, the bearing ring rotation between the mating surface. In general, must have the appropriate amount of interference, bearing ring can be fixed in the radial direction and enough support. If there is no right or full bearing ring is fixed, it is easy to cause damage to the bearings and related components. But sometimes in order to facilitate installation and removal, or bearing for use on the floating end need to have the function that axial movement, cannot use interference fit. In some adopt under the condition of clearance fit, need to take some special measures to reduce the wear and tear caused by creep, such as: fitting surface hardening on the surface of bearing and gear shoulder, through special lubrication slot to lubrication fitting surface and exclusion of wear particles, or use bearing lateral positioning key way to fix the bearing.