Brakes with wooden blocks placed inside flexible steel band - Theory of Machines - 1

Q.  Which type of brakes have wooden blocks placed inside flexible steel band?
- Published on 06 Aug 15

a. Block brake
b. Band brake
c. Band and Block brake
d. Pivoted block brake

ANSWER: Band and Block brake

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    Discussion

  • Sravanthi   -Posted on 19 Oct 15
    - Band and Block brakes have wooden blocks placed inside flexible steel band. These blocks are pressed against the drum when brake is applied. Braking action is provided by this friction between block and drum.

    - Wooden blocks are provided because they have high coefficient of friction and can be easily replaced when worn.

    - Effectiveness of band and block brake increases due to high coefficient of friction.

    - Braking torque on the drum of band and block brake is given as

    (TB) = (Tn – To) x r

    where,
    Tn = Tension on tight side
    To = Tension on slack side

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