With the progress and development of society, mechanization has been widely used in production and life. Bearing as an indispensable part of the machinery, the scope of its use will be more and more widely, because as long as there is a rotation of the place to use bearing.

Bearing in the machinery is mainly to support and reduce the role of friction, so the accuracy of the bearings, noise, etc. are directly related to the use of machinery and life. However, the business people always meet some customers that the use of the best bearings or imported bearings and its efficiency is not high, which is related to the use of bearing and the choice of the problem. Maybe someone will say, "the use and choice of bearings is the user's business, I just what users want what I sell". But as a qualified sales staff in addition to master their own product knowledge but also proficient in product use, namely doctors sales, according to the user's accessory products performance, using criteria to select the best of the supporting bearing. This is the world's major companies in the world of professional manufacturing and sales, this way in the implementation of the group has also achieved good results.

Because of the wide range of types of bearings, the following will be mainly the use and selection of deep groove ball bearing for the most widely used as some analysis. I hope to know less about the bearing can deepen the understanding of the bearing

First, the choice of bearing

1, bearing model choice: bearing model is generally by the user's technical personnel in accordance with the supporting products of the use of conditions and bearing load to carry on the choice of bearing. Business personnel are mainly about user's actual load whether with the selected bearing consistent, if the bearing is not up to the requirements, should advise the customer as soon as possible the election model, but unless special products in the choice of models generally do not have any questions.

The choice of 2, bearing clearance: user to buy Bearings generally only inform on what type, grade, rarely claim on the bearing clearance, the business people must ask clear bearing conditions of use, the running speed of the bearing, temperature, combined with tolerances are directly related to the shaft bearing clearance choice. General in the 3500 turn / points below the speed of the motor is used mostly cm clearance, such as high temperature and high speed motor requires a relatively large clearance. Bearing clearance after the assembly will because the inner hole of the swollen and round narrow and lead to a reduction, the clearance of reduce weight = over surplus quantity x 60% (the bearing chamber is aluminum, with the exception of). Such as bearing clearance before assembly is 0.01mm, assembly interference of 0.01mm, the clearance of 0.004mm bearing assembly. On the theory of bearing in the zero clearance noise and life to reach the best state, but in actual operation, taking into account issues such as temperature rise, bearing assembly clearance is 0.002mm-0.004mm better.

3, the choice of fat: Grease selection is generally based on the speed of the bearing, temperature, noise requirements and the starting torque and other aspects of choice, require the business staff to understand the performance of a variety of oils and fats.

4, bearing seal type choice: bearing lubrication can be divided into oil lubrication and grease lubrication. Oil lubricated bearings are generally used in the form of bearings, grease lubricated bearings are generally used to seal the seal cover or rubber seal. Dust cap applicable to high temperature or use the site, a contact seal and non contact type seal seal, contact type sealing dustproof performance is good but the torque is large, non-contact sealing the starting torque is small, but the sealing performance no contact.