hw13.Fall.2010x

hw13.Fall.2010x - of 120, let the friction surface of the...

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ME 452: Machine Design II Homework Set 13 Problem 1. The figure below shows an internal rim=type brake having an inside rim diameter of 12 inches and a dimension R = 5 inches. The shoes have a face width of 1.5 inches and are both actuated by a force of 500 lb. The mean coefficient of friction is 0.28. (a) Calculate the maximum pressure and indicate the soe on which it occurs. (b) Calculate the braking torque effected by each shoe, and find the total braking torque. (c) Calculate the resulting hinge-pin reaction forces. Problem 2. For the brake in Problem 1 above, consider the pin and actuator locations to be the same. Also, leave the self-energizing (right) shoe the same, but for the non-self-energizing (left) shoe, instead
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Unformatted text preview: of 120, let the friction surface of the brake shoe be and centrally located (centered about the horizontal line shown through each shoe). (a) Calculate shoe size, for the left shoe such that the maximum pressure on each shoe is the same (this will make them tend to wear at the same rate). (b) Calculate the braking torque on each shoe, and find the total braking torque. Problem 3. Use the geometry and loading of Problem 1, but apply the short shoe approximation to estimate the average pressure on both shoes, the torque capacity of each shoe, the total torque capacity, and the pin reaction forces on each shoe. Compare the short shoe results with the long shoe results from Problem 1 above....
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hw13.Fall.2010x - of 120, let the friction surface of the...

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