Class 2 (2nd Engineer) MEKG 📅 Mar 2024

Exam Question

(a) Explain how wear on bearing surfaces is effected by each of the following factors:

(i) Dissimilarity of materials in the contact surfaces

(ii) Relative speed of sliding between the surfaces

(iii) Roughness of the surfaces

(iv) Incompatibility of lubricant and bearing material.

(b) Describe how each effect may be identified during inspection, Suggest corrective action at either operational or maintenance stages.

Reference Answer

### Introduction to Bearing Wear
Bearing wear is the progressive loss of material from the surfaces of a bearing and its corresponding journal due to relative motion. The primary objective of a bearing is to support a load while allowing motion with minimal friction and wear. This is achieved by maintaining a lubricant film between the moving surfaces. The failure of this film, or its contamination, leads to wear. The rate and type of wear are influenced by several interconnected factors.
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### (i) Dissimilarity of Materials in Contact Surfaces

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