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Detailed analysis of "bearing clearance"
Source: China Bearing Network Time: 2013-03-01
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The bearing device has a clearance when the machine is subjected to a certain load; that is, the available clearance plus the amount of elastic deformation of the bearing load is referred to as "working clearance".
When the working clearance is slightly negative; the fatigue life of the bearing is the longest, but the fatigue life decreases with the increase of the negative clearance. Therefore; when selecting the clearance of the bearing; usually the working clearance is zero or Slightly positive.
The radial clearance of the rolling bearing means that one ferrule is fixed; the other ferrule is perpendicular to the bearing axis; the movement from one pole orientation to the other pole orientation. The selection of the bearing clearance is correct or not. It has a great influence on the precision of mechanical operation, bearing life, frictional resistance, temperature rise, oscillation and noise. For example, if the selection of the radial bearing clearance is too small, the bearing clearance will receive the load. The number of the number increases; the contact stress is reduced. The common 掀 掀 龋 牵 牵 牵 Σ Σ Σ 崽岣 崽岣 崽岣 崽岣 崽岣 崽岣 崽岣 崽岣 崽岣 崽岣 å之 å之 å之 崽岣 å之 å之 å之 å之 å之 å之 å之 å之 å之 å之 å之 å之 å之 å之Conditions; picking the most appropriate clearance value; has a very important meaning. When choosing the bearing clearance; it is necessary to fully consider the following main factors:
.1) The tightness of the bearing cooperation with the shaft and the housing hole will cause a change in the bearing clearance value. Usually the bearing device will reduce the clearance value.
.2) The bearing is in the process of organization; because the heat dissipation condition of the shaft and the outer casing is different; the temperature difference between the inner ring and the outer ring occurs; thus, the clearance value is reduced.
.3) Because the shaft and casing data are not the same due to the expansion coefficient; it will cause the clearance value to decrease or increase.
Usually the most suitable job clearance value for the radial bearing is the basic group clearance value in the bearing clearance specification. The basic group clearance value is suitable for the normal conditions; it should be preferred. About the centripetal work under special conditions When the bearing can not use the basic group clearance; the clearance value of the auxiliary group can be selected. For example, the clearance values ​​of the 3rd, 4th and 5th groups of the deep groove ball bearing are suitable for the bearing and the shaft and the shell hole are tighter than the normal cooperation. In the mechanical parts with large temperature difference between the inner ring and the outer ring of the bearing, the middle line between the shaft and the outer hole of the outer casing has a large inclination; and the axial load can be added for adding it; the limit speed of the bearing is improved; and the friction of the bearing is lowered. Under the conditions of resistance and other working conditions; the clearance values ​​of the 3rd, 4th and 5th groups can also be selected. For the shaft with fine rotation or constrained axial movement; the bearing with the second set of clearance value (small clearance value) is usually selected. And if necessary, give a certain preload "pre-tightening"; to improve the rigidity of the shaft.
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