Miniature bearing radial clearance and axial clearance

Because of the miniature deep groove ball bearing generally designed under no load condition with radial clearance, so the bearing axial clearance will exist. In addition to the axial take after, will make the ball and liquid flux occurs with radial plane form the Angle of inclination, to produce a contact is not equal to 0 ° Angle. Angular contact ball bearing is specially designed to withstand the thrust load, bearing the initial contact Angle from no load to the clearance and curvature to determine fluid gap. Figure 2. After 2 showed that eliminate the axial play of deep groove ball bearing geometry relationship. We can find that, in the outer groove curvature center O 'and the distance between の is P = r A. + r - D ( 2. 6) In r = D, ( 2. 7) Figure 2. 2 deep groove ball bearing axial A = (inside and outside the circle 。 + f - 1) D = BD after moving the ball and raceway contact type B = f. +、- 1 is the total curvature of the bearing. In figure 2. 2 also, you can see that the initial contact Angle is the ball with the inner and outer raceway contact point of attachment and perpendicular to the bearing rotation axis of the Angle between the radial plane. The size of the initial contact Angle can be determined by the type ( 28) Or P ( 29) 2 a if bearing assembly USES the interference fit, you must change the diameter of the ring to reduce the radial clearance, so you can get the initial tentacles. So P + delta P2. 10 e co due to radial clearance, the centripetal bearing under no load condition on the axial float. The initial axial clearance definition see example 2. Under zero load inner ring the maximum number of axial moving relative to the outer ring. By figure 2. 2: miniature bearing 2 P. =Asina 2. 12 P asi 2 in figure 2. 3 shows the single row ball bearing the initial contact Angle and the axial clearance and P/D. Double row angular contact ball bearing usually have certain radial clearance after assembly ( Less than a single bearing radial clearance) 。