Question:
The criterion of static load carrying capacity is the permanent deformation of the parts of bearing. The limiting value of permanent deformation is
The criterion of static load carrying capacity is the permanent deformation of the parts of bearing. The limiting value of permanent deformation is
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This design limit is extremely stringent because even tiny indentations (known as brinelling) on the raceway can cause significant noise and rapid deterioration during operation.
Updated On: Jul 9, 2026
- 0.001 of the ball diameter
- 0.0001 of the ball diameter
- 0.1 of the ball diameter
- 0.01 of the ball diameter
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
This question is about the design and static load-carrying capacity of rolling contact bearings.
It asks for the standard limiting value of permanent deformation allowed in ball bearings.
Step 2: Key Formula or Approach:
The static load capacity ($C_0$) of a bearing is defined as the static load that corresponds to a total permanent deformation of the rolling element and raceway at the most heavily stressed contact point.
Step 3: Detailed Explanation:
• Under high static loads, rolling bearings undergo local plastic (permanent) deformation at the contact surfaces.
• According to ISO standards, the maximum permissible permanent deformation that does not impair the smooth operation of the bearing is limited to $0.0001$ of the ball diameter.
• This extremely small limit is selected to prevent vibration, noise, and premature fatigue failure during subsequent rotation of the bearing.
• Thus, the ratio of permanent deformation to the ball diameter is limited to $10^{-4}$ (or $0.01\%$).
Step 4: Final Answer:
The limiting value of permanent deformation is $0.0001$ of the ball diameter.
This question is about the design and static load-carrying capacity of rolling contact bearings.
It asks for the standard limiting value of permanent deformation allowed in ball bearings.
Step 2: Key Formula or Approach:
The static load capacity ($C_0$) of a bearing is defined as the static load that corresponds to a total permanent deformation of the rolling element and raceway at the most heavily stressed contact point.
Step 3: Detailed Explanation:
• Under high static loads, rolling bearings undergo local plastic (permanent) deformation at the contact surfaces.
• According to ISO standards, the maximum permissible permanent deformation that does not impair the smooth operation of the bearing is limited to $0.0001$ of the ball diameter.
• This extremely small limit is selected to prevent vibration, noise, and premature fatigue failure during subsequent rotation of the bearing.
• Thus, the ratio of permanent deformation to the ball diameter is limited to $10^{-4}$ (or $0.01\%$).
Step 4: Final Answer:
The limiting value of permanent deformation is $0.0001$ of the ball diameter.
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