Analysis of selection criteria for bearing clearance

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Analysis of selection criteria for bearing clearance

Source: Bearing network time: 2014-04-19
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First, the selection criteria of bearing clearance:
1. Select tight cooperation; large temperature difference between inner and outer ring, demand conflict conflict torque and deep groove ball bearing accept large axial load or need to improve the function of centering; large clearance group should be used.
2. When the rotation precision demand is high or the axial displacement is strictly restricted; the small clearance group should be selected.
Second, the elements related to the play:
1. Cooperation between bearing inner ring and shaft.
2. Cooperation between bearing outer ring and outer casing hole.
3. The effect of temperature.
Note: The reduction of radial clearance is related to the practice of cooperative parts, the size of the excess interference, the size of the shaft diameter, and the wall thickness of the shell hole.
1. The practical useful interference (inner circle) should be: â–³ dy = 2 / 3 â–³ dCG * â–³ d is the nominal interference; G * is the level of the interference cooperation.
2. The practical useful excess (outer ring) should be: â–³Dy=2/3â–³DCG*â–³D is the nominal interference; G* is the flattening scale of the interference cooperation.
3. The heat generated will cause the internal temperature of the bearing to rise; this will lead to the expansion of the shaft, the bearing housing and the bearing parts. The clearance can be increased or decreased. 鲇谥岷 [鲇谥岷 岢 岢 岢 以及 以及 以及 以及 以及 以及 以及 以及 以及 以及Temperature between the degrees of shaving.
Third, the calculation formula of the clearance:
(1): The impact of cooperation
1. Bearing inner ring and steel solid shaft: â–³j=â–³dy*d/h
2. Bearing inner ring and steel hollow shaft: â–³j=â–³dy*F(d)
F(d)=d/h*[(d/d1)2-1]/[(d/d1)2-(d/h)2]
3. Bearing outer ring and steel solid shell: â–³A=â–³Dy*H/D
4. Bearing outer ring and steel thin-walled casing: â–³A=â–³Dy*F(D)
F(D)=H/D*[(F/D)2-1]/[(F/D)2-(H/D)2]
5. Bearing outer ring and gray cast iron casing: â–³A=â–³Dy*[F(D)C0.15]
6, bearing outer ring and light metal casing: â–³ A = â–³ Dy * [F (D) C0. 25]
Note:
â–³j--The amount of expansion of the inner ring raceway rib diameter (um).
â–³ dy journal has a useful interference (um).
D--bearing inner diameter nominal scale (mm).
H--inner ring raceway rim diameter (mm).
B--bearing width (mm).
D1-- hollow shaft inner diameter (mm).
â–³A--the shortening of the diameter of the outer ring raceway rib (mm).
â–³ Dy - shell hole diameter practice useful interference (um).
H--outer ring raceway rim diameter (mm).
D--bearing outer ring and housing hole nominal diameter (mm).
F--bearing housing outer diameter (mm).
(2): Effect of temperature △T=Гb*[De*(T0CTa)Cdi*(TiCTa)]
Гb is the linear expansion coefficient; bearing steel is 11.7*10-6mm/mm/0C
De is the bearing outer ring raceway diameter; di is the bearing inner ring raceway diameter.
Ta is the ambient temperature.
T0 is the bearing outer ring temperature; Ti bearing inner ring temperature.
Fourth, the relationship between axial clearance and radial clearance:
Ua=[4(fe+fiC1)*Dw*UrCUr2]1/2
Because the radial clearance Ur is small, Ur2 is very round.
Therefore Ua=2*[(fe+fiC1)*Dw*Ur]1/2
In the meantime, fe is the curvature coefficient of the outer ring groove; fi is the curvature coefficient of the inner ring groove; Dw is the diameter of the steel ball.

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