The selection of bearing

The selection of bearing to explore: along with society's progress and development, mechanization is widely used in the production and life. Bearing, as an integral part of the machinery, the scope of its use will be more and more widely, because as long as there are places are used bearing rotation. Mainly in mechanical and bearing support, and the function of reducing friction, so the precision of the bearing, the noise is directly related to the use of machinery and longevity. The following will be the use of bearing and do some analysis, for people to correctly use and select the bearing. Bearing model selection of bearing model is usually used by the user's technical personnel according to the product of form a complete set of conditions and the load bearing for selection. Business people mainly learn the user's actual load is consistent with the selected bearing, if bearing can not meet the use requirements, should suggest customer re-election model as soon as possible, but unless special products on the choice models generally do not have what problem. The selection of grease oil is generally according to the requirements of the bearing rotating speed, heat resistance, noise and choose starting torque, etc, require business personnel to the performance of a variety of oils and fats to be understood. The choice of bearing seal type bearing lubrication can be divided into oil lubrication and grease lubrication. Oil lubricated bearing is generally choose form of bearing, grease lubricated bearing dust cover is generally selected or rubber seal seal. Dust cover suitable for high temperature or the use of good parts, seal two points contact seal and non-contact seal and contact seal dustproof performance is good but the starting torque, the sealing type starting torque is small, but there is no contact sealing performance is good. Bearing clearance choice when buying bearing users generally just let us know in what type, grade, rarely on bearing clearance request, business people must ask bearing conditions of use, which the bearing rotating speed, temperature and tolerance are directly related to the selection of the bearing clearance. Generally under 3500 RPM speed motor mostly adopts CM clearance, such as high temperature and high speed motor, require the use of relatively large clearance. Shaft bearing clearance after assembly will rise because of the inner hole and cylindrical reduction and lead to reduce, the reduction of clearance = interference quantity x 60% ( Except the bearing chamber is aluminum) 。 Such as bearing clearance is zero before assembly. 01 mm, interference when assembling the quantity to zero. 01 mm, bearing assembly after the clearance of 0. 004mm。 In theory at zero clearance noise and bearing life can reach the best state, but in actual operation considering the problems such as temperature, bearing clearance to 0 after assembly. 002mm- 0. 004 mm is better.