The intensity of normal pressure between the friction lining and the brake drum at any point is proportional to square of the vertical distance from the pivot.
The coefficient of friction in internally expanding brakes is constant.
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The centrifugal force acting on the shoe can never be omitted.
In internally expanding brake, a large actuating force produces a small braking torque and hence this brake isn’t used generally.
Heat dissipating capacity of internally expanding brakes is a problem.
Internally expanding brakes never suffer the problem of self-locking.
Moment of normal force and frictional forces about the pivot axis are 640000N-mm and 250000N-mm respectively. If force acts at a distance of 190mm from the pivoted point, calculate the actuating force.
Needles bearings have not much load capacity as they are quite small.
49 videos|70 docs|77 tests
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49 videos|70 docs|77 tests
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