Uniform normal pressure observed between block & drum - Theory of Machines - 1

Q.  In single shoe brake, when is uniform normal pressure observed between block and drum?
- Published on 06 Aug 15

a. θ < 60o
b. 2θ < 90o
c. 2θ < 60o
d. θ > 30o

ANSWER: 2θ < 60o

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    Discussion

  • Sravanthi   -Posted on 19 Oct 15
    Single shoe brake

    - Single shoe brakes consist of blocks pressed against the rotating drum surface.

    - The drum rotation is retarded due to friction between friction lining on the block and drum.

    - In single shoe brake, if angle of contact (2θ) is less than 60°, uniform normal pressure is observed between block and drum.

    Pivoted shoe brake

    - If angle of contact is greater than 60°, then it is assumed that wear is uniform and intensity of pressure is not uniform.

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