Date: 2013-08-20

Several aspects into consideration when selecting bearing clearance

Bearing operating conditions, load, temperature, speed, etc;
Requirements for bearing performance (running accuracy, friction, vibration, noise);
Bearing with shaft and housing bore is caused when an interference fit bearing clearance reduction;
When bearing, inner and outer rings of temperature difference resulting in reduced bearing clearance;
Due to different coefficients of expansion of the shaft and housing materials, resulting in bearing clearance decreases or increases.
According to experience, the ball bearings are the most suitable operational clearance to zero; roller bearings with few operational clearance should be maintained. Part which requires supporting good rigidity, allows a certain number of preload of bearing. Here, in particular, that the so-called operational clearance, refers to the bearing clearance under actual operating conditions. There is also a clearance original clearance, refers to the bearing clearance without having to install. Clearance original clearance greater than installed. Our selection of clearance, the main is to select an appropriate operational clearance.
National standard clearance values are divided into three groups: the basic group (0 group), small clearance, secondary groups (1, 2), secondary groups and large internal clearance (3, 4, 5). When selected, under the normal working conditions should preference for a basic group, you can enable the bearing to be suitable operational clearance. When the group is not able to meet the application requirements, you should use a secondary clearance. Large tour gap secondary group applies Yu bearing and axis and shell hole used had Ying tie, bearing both inside and outside ring temperature larger, deep groove ball bearing needs bear larger axis to load or needed improve adjustable heart performance, heart and the requirements improve limit speed and reduced bearing friction moments, occasions; small tour gap secondary group applies Yu requirements high of rotating precision, and needed strictly control shell hole of axis to displacement, and needed reduced vibration and noise of occasions.

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