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Consider the following design considerations:  
1. Tensile failure
2. Creep failure
3. Bearing failure
4.Shearing failure
5. Bending failure
The design of the pin of a rocker arm of an I.C. engine is based on 
  • a)
    1, 2 and 4    
  • b)
    1, 3 and 4    
  • c)
    2, 3 and 5    
  • d)
    3, 4 and 5.
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Consider the following design considerations:1. Tensile failure2. Cree...
Design of pin of a rocker arm of an I.C. engine is based on bearing, shearing, and bending failures.
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Consider the following design considerations:1. Tensile failure2. Cree...
Understanding the Design Considerations for Rocker Arm Pins
When designing the pin of a rocker arm in an internal combustion (I.C.) engine, several failure modes should be considered. The correct answer, option 'D', focuses on bearing failure, shearing failure, and bending failure. Here’s a detailed breakdown:
Tensile Failure
- This failure mode occurs when the material experiences excessive tensile stress.
- While important, tensile failure is not the primary concern for the pin in this context.
Creep Failure
- Creep failure happens over time under constant stress at elevated temperatures.
- Although creep is relevant in high-temperature applications, it is less critical for rocker arm pins, which operate under variable loads and temperatures.
Bearing Failure
- Bearing failure is crucial since the pin acts as a pivot point in the rocker arm assembly.
- Proper design must account for the loads transferred through the pin to prevent excessive wear or seizure.
Shearing Failure
- Shearing failure occurs when the pin is subjected to lateral forces that cause it to slide or fail along its cross-section.
- This type of failure is significant in rocker arms due to the dynamic forces at play.
Bending Failure
- Bending failure arises when the pin is subjected to moments causing it to bend beyond its elastic limit.
- Given the rocker arm's motion and the forces it experiences, ensuring the pin can withstand bending stresses is vital for longevity and performance.
Conclusion
Selecting option 'D' (bearing, shearing, and bending failures) emphasizes the critical design aspects that will ensure the pin's durability and functionality in an I.C. engine rocker arm. Proper consideration of these factors leads to safer and more efficient engine operation.
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