By Mathcad Staff
This worksheet will:
This worksheet using PTC Mathcad shows you how to determine the actuating force and the brake capacity of a long-shoe internal brake. For this particular worksheet the long-shoe brake is actuated by a device that exerts the same force on each shoe and the shoes are identical in form and are symmetrically position about the vertical centerline. The worksheet begins by listing the parameters of the brake geometry and the brake line properties. These include:
To solve, the worksheet first shows you how to calculate for the assumed pressure distribution for the long-shoe brake. Because the clockwise drum rotation causes the right-hand shoe to be self-energizing, you can determine the actuating force on the basis that the maximum allowable pressure will occur there. The worksheet then shows you how to calculate for the friction force moment, the normal force moment, the torque applied to the drum, and the actuating force.
Next, the worksheet shows you how to calculate for the pressure on the left-hand shoe, along with the torque applied to drum and the brake capacity. All images, notation, formulas, calculations, data, and solutions are provided to aid you in your own calculations.
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