Double Angular Contact Ball Bearing | Online Calculator

Bearing Calculators







Double Angular Contact Ball Bearings

This calculation determines a dynamic equivalent radial load Pr, nominal life L10 and dynamic radial load rating Cr of double angular contact ball bearings, installed by "O" or "X" scheme and corresponding to a 90% probability of no-failure operation when applying commonly used materials.

The calculation is made in accordance with ISO/TR 1281: 2008. Besides, a possibility of taking into account the influence of temperature and operating conditions on the bearing life has been added. The effect of wear and corrosion on bearing life is not considered.

The calculation is applicable to normal operating conditions: the bearing is correctly installed, lubricated, protected against ingress of foreign matter, its loading is appropriate for the bearing size, and the bearing is not subject to excessive temperature and speed changes.

The calculation is made according to the geometric characteristics of the bearing.

Double angular contact ball bearings
Double angular contact ball bearings calculation

INITIAL DATA

D - Bearing outer diameter;


d - Bearing hole diameter;


Dw - Ball diameter;


Dpw - Bearing diameter by balls center;


z - Number of balls in one bearing;


α - Contact angle. Must be between 5° and 45°;


Fr - Radial service load;


Fa - Axial service load;


Kσ - Safety factor, taking into account the type of load (see table below);


Т - Bearing temperature.

RESULTS DATA

Pr - Dynamic equivalent radial load - permanent stationary radial load under which the bearing will have the same service life as under operating load conditions;


Cr - Dynamic radial load rating - constant radial load, that bearing will endure for 106 revolutions;


L10 - Nominal bearing life (in 106 revolutions).

Outer diameter (D)

Hole diameter (d)

Ball diameter (Dw)

Diameter (Dpw)

Number of balls (z)

Contact angle (α)

Radial load (Fr)

Axial load (Fa)

Service temperature (Т)

Safety factor (Кσ)

Equivalent radial load (Pr)

Radial load rating (Cr)

Bearing life (L10) 106 revolutions

BASIC FORMULAS

Dynamic radial load rating:

Сr = bmfc(icosα)0.7*z2/3*Dw1.8 at ball diameter Dw < 25,4 mm (1");

Сr = 3,647*bm*fc*(2cosα)0.7*z2/3*Dw1.4 at ball diameter Dw > 25,4 mm (1");

bm = 1.3;
fc - coefficient, depending on the ratio Dw / Dpw

Dynamic equivalent radial load:

Pr = XFr + YFa;

X and Y - coefficients, depending on the ratio Fa / Fr and on contact angle;

Nominal bearing life:

L10 = (Сr / Pr) 3.

INITIAL DATA

D - Bearing outer diameter;


d - Bearing hole diameter;


Dw - Ball diameter;


Dpw - Bearing diameter by balls center;


z - Number of balls in one bearing;


α - Contact angle. Must be between 5° and 45°;


Fr - Radial service load;


Fa - Axial service load;


Kσ - Safety factor, taking into account the type of load (see table below);


Т - Bearing temperature.

RESULTS DATA

Pr - Dynamic equivalent radial load - permanent stationary radial load under which the bearing will have the same service life as under operating load conditions;


Cr - Dynamic radial load rating - constant radial load, that bearing will endure for 106 revolutions;


L10 - Nominal bearing life (in 106 revolutions).

SAFETY FACTOR Kσ

Kσ

Load Condition

1

Load without jolts

1÷1.2

Light shocks and short-term overloads up to 125% of the rated load

1.3÷1.5

Moderate shocks, vibration load, short-term overloads up to 150%
of the rated load

1.5÷1.8

Moderate shocks, vibration load, short-term overloads up to 150%
of the rated load in high humidity conditions

1.8÷2.5

Significant shocks and vibrations, short-term overloads up to 200% of the rated load

2.5÷3.0

Loads with strong shocks, short-term overloads up to 300% of the rated load

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