First, clearance choice:

1,adopt a tight fit, inside and outside circle temperature difference, need to reduce friction torque and deep groove ball bearing axial load or need to improve the performance of aligning occasions, appropriate use large clearance group.

2, when rotating accuracy higher or need to strictly limit the axial displacement, appropriate use small clearance group.

Second, the relevant factors of clearance:

1, bearing inner ring with the axis.

2, bearing outer ring with the shell holes.

3 ， the influence of the temperature.

Note: radial clearance to reduce the volume and cooperate with the actual effective parts over surplus quantity size, match the size of the housing holes, trunnion wall thickness relevant.

1, actual and effective over surplus quantity (inner circle) should be:△dy = 2/3△d - G*   △d

for a surplus quantity, G * for full cooperation of planish size.

2, actual and effective over surplus quantity (outer  circle) should be: △Dy = 2/3△D - G*   △D

for a surplus quantity, G * for full cooperation of planish size.

3, the quantity of heat will lead to bearing interior temperature higher, then cause shaft, housing and bearing parts inflation. Clearance can increase or decrease , it depends on the axis and the housing material, and bearing and bearing supporting the temperature tonsure.

Third, the clearance calculation formula:

(1) :  the impact

1, bearing inner circle and steel solid shaft: △j = △dy * d/h

2, bearing inner circle and steel hollow shaft: △j = △dy * F(d)

　　F(d) = d/h * [(d/d1)2 -1]/[(d/d1)2 - (d/h)2]

3, bearing outer ring and steel entity shell:△A = △Dy * H/D

4, bearing outer ring and steel thin shell: △A = △Dy * F（D）

　　F(D) = H/D * [(F/D)2 - 1]/[(F/D)2 - (H/D)2]

5, bearing outer ring and gray cast iron shell: △A = △Dy * [F(D) - 0.15 ]
6, bearing outer ring and light metals shell:△A = △Dy * [F(D) - 0.25 ]



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