The choice of bearing clearance

Joint bearing is mainly outside the sphere of an inner and an outer ring formed within the sphere, can bear larger load. According to their different types and structures, can bear radial load, axial load or radial, axial joint load simultaneously. The theory of rolling bearing rotation axis import line, on the inner ring to the center axis line of imported bearings, on the thrust bearing, it means the import axis circle axis line.
 A, clearance of the selection principle:

a, with a more compact, large temperature difference between inside and outside the ring, need to reduce the friction torque and the deep groove ball bearing axial load or a greater need to improve the self-aligning properties of the occasion, should adopt the large clearance group.

b, when the rotation with high precision or to strictly limit the axial displacement, should adopt a small clearance group.

B, with the clearance-related factors:

a, with the bearing inner ring and shaft.

b, bearing with outer ring and the shell holes.

c, temperature.

Note: The amount of radial clearance with the mating parts to reduce the actual amount of interference and effective size, shaft diameter to match the size of the wall thickness of the shell hole.

a, practical and effective amount of interference (inner ring) should be: △ dy = 2 / 3 △ d-G * △ d is

Nominal amount of interference, G * for the interference fit of the pressure level measurements.

b, practical and effective amount of interference (outer) should be: △ Dy = 2 / 3 △ D-G * △ D is

Nominal amount of interference, G * for the interference fit of the pressure level measurements.

c, heat will cause the internal bearing temperature, and subsequently the shaft, bearing and bearing parts of the expansion. Clearance can increase or decrease, depending on the shaft and housing materials, and parts of rolling bearings and bearing temperature between the tonsure.

C, clearance formula:

(1): Coordination in

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

b, bearing inner ring and the steel hollow shaft: △ j = △ dy * F (d)

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

c, bearing outer ring and the steel shell entities: △ A = △ Dy * H / D

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

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

e, bearing outer ring and cast iron case: △ A = △ Dy * [F (D) -0.15]

f, bearing outer ring and the light metal shell: △ A = △ Dy * [F (D) -0.25]

Note:

△ j - Diameter of Inner Ring Road, the expansion of capacity Ribs (um).

△ dy-journal effective amount of interference (um).

d - Bearing inner diameter nominal size (mm).

h - Ribs inner ring raceway diameter (mm).

B - Bearing width (mm).

d1 - Hollow Shaft diameter (mm).

△ A - outer ring raceway ribs diameter shrinkage (mm).

△ Dy - a practical and effective housing diameter amount of interference (um).

H - the outer ring raceway flange diameter (mm).

D - bearing outer ring and the shell holes of nominal diameter (mm).

F - Bearing shell diameter (mm).

(2): Temperature

△ T = Гb * [De * (T0-Ta)-di * (Ti-Ta)]

One Гb the linear expansion coefficient, bearing steel as 11.7 * 10-6 mm / mm / 0C

De for the bearing outer ring raceway diameter, di inner raceway for the bearing diameter.

Ta is ambient temperature.

T0 for the bearing outer ring temperature, Ti bearing inner ring temperature.

D, axial clearance and radial clearance of the relationship:

Ua = [4 (fe + fi-1) * Dw * Ur-Ur2] 1 / 2

Ur a result of radial clearance is small, so Ur2 small, negligible.

Therefore, Ua = 2 * [(fe + fi-1) * Dw * Ur] 1 / 2

Which is the outer ring groove curvature coefficient fe, fi for the inner ring groove curvature coefficient, Dw for the ball diameter.

Inner ring (shaft ring) axis line of inner ring (shaft washer) axis inner ring (shaft circle) of the basic cylindrical hole or holes in the internal tapered cylinder or cone in the axis line access.
 

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