What is the term for the clearance that remains in a bearing after it has been mounted on a shaft?

• A. Running clearance
• B. Installed clearance
• C. Initial clearance
• D. Operational clearance

Answer: (B)

The term for the clearance that remains in a bearing after it has been mounted on a shaft is installed clearance. This refers to the space between the inner surface of the bearing and the shaft once it is in position, accommodating any misalignment, thermal expansion, or wear that may occur during operation.

Installed clearance is crucial for ensuring that the bearing can function effectively and minimizes the risk of excessive friction or wear, which can lead to bearing failure. It is a critical parameter to check during the installation process as it directly impacts the performance and longevity of the bearing in service.

While running clearance, initial clearance, and operational clearance are terms related to bearing function, they do not specifically describe the condition of the clearance after the bearing has been mounted. Running clearance typically refers to the gap present during operation when the bearing is rotating, which can change with temperature and load. Initial clearance might describe the clearance measured before installation or right after bearing assembly, and operational clearance usually concerns the dynamic behavior of the bearing while in active motion rather than the static condition post-installation.