An offset corner force creates a hub moment. This simplified calculation represents that moment with an equal-and-opposite bearing-row couple separated by the entered spacing, then resolves the row reaction along an entered contact angle.
Wheel Hub Assembly Interactive Calculator
Enter corner force, moment arm, bearing-row spacing and contact angle. Results describe an ideal static force balance. They do not give bearing life, preload, combined loading, stiffness or a hub specification.
Equation Used
- The corner force is static and acts at the entered perpendicular offset.
- Two bearing rows form a pure couple at the entered spacing.
- The entire row reaction is resolved through the entered contact angle.
- Radial load sharing, preload, axial load, multiple contacts and stiffness are omitted.
- Bearing life, fit, temperature, lubrication, fatigue and safety are omitted.
Idealized Hub Bearing-Row Couple
The NASA Glenn torque reference supports the force-times-offset moment relation. The remaining row-couple and angle resolution are declared simplifying assumptions.
What This Calculator Represents
It is a static moment and idealized two-row reaction screen.
Moment and Couple comparison
F_row=M/s
F_contact=F_row/sin(alpha)
The displayed 0.050 mm runout reference is fixed, not computed.
Worked Scenario
At 3 kN, 50 mm offset and 35 mm row spacing, moment is 150 N m and ideal row reaction about 4.29 kN. At 35 degrees, the contact-load quotient is about 7.47 kN.
Assumptions and Limits
- Calculated: force-offset moment and ideal couple/angle quotients.
- Illustrated: two bearing rows, spacing, force and reactions.
- Not calculated: bearing life, preload, stiffness, load sharing, fit, runout generation, fatigue or safety.
Frequently Asked Questions
Is row reaction a measured bearing load?
No.
Is contact load a life rating?
No.
Is 0.050 mm a universal limit?
No; it is a fixed displayed reference.
Are radial and axial loads combined?
No.
Is preload included?
No.
Can this select a bearing?
No.
References
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