GATE ME 2016 Set 2 — Question 22
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Machine Design → Machine Elements → Brakes, Clutches & Springs
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Question
For the brake shown in the figure, which one of the following is TRUE?
Correct answer
(A) Self energizing for clockwise rotation of the drum
Solution
A brake is said to be self-energizing if the friction force assists in applying the brake by increasing the normal force for a given applied force.Take moments about the pivot at the lower-left end of the lever, which lies at the level of the drum centre; the shoe touches the drum at its top, i.e. above the pivot.
1.The applied force at the right end creates a clockwise moment about the pivot.
2.The normal reaction from the drum on the shoe (upward on the lever) creates an anti-clockwise moment about the pivot.
3.For clockwise rotation of the drum, the top of the drum moves to the right, so the friction force on the shoe acts towards the right. Acting above the pivot, this rightward force creates a clockwise moment about the pivot.
The friction moment is in the same direction as the moment of , so it helps press the shoe against the drum: the brake is self-energizing for clockwise rotation. For anti-clockwise rotation the friction moment opposes , so it is not self-energizing in that direction.Answer: (A) Self energizing for clockwise rotation of the drumContinue learning with Success Tracker
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