Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
10th Edition
ISBN: 9780073398204
Author: Richard G Budynas, Keith J Nisbett
Publisher: McGraw-Hill Education
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Chapter 16, Problem 15P

The figure shows a band brake designed to prevent “backward” rotation of the shaft. The angle of wrap is 270°, the band width is 2 1 8 in, and the coefficient of friction is 0.20. The torque to be resisted by the brake is 150 lbf · ft. The diameter of the pulley is 8 1 4 in.

(a)    What dimension c1 will just prevent backward motion?

(b)    If the rocker was designed with c1 = 1 in, what is the maximum pressure between the band and drum at 150 lbf · ft back torque?

(c)    If the back-torque demand is 100 lbf · in, what is the largest pressure between the band and drum?

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The width of the simple band brake shown in the figure is 30 mm. The coefficient of friction between the brake and the drum surface is 0.20. Determine the braking torque and thickness of the band if the tensile stress is not to exceed 65 N/mm2.
The block brake, as shown in the figure, provides a braking torque of 376 N-m. The diameter of the brake drum is 258 mm. The coefficient of friction is 0.3. Find: a. The force (P), in Newtons, to be applied at the end of the lever for the clockwise rotation of the brake drum b. The force (P), in Newtons, to be applied at the end of the lever for the counter clockwise rotation of the brake drum; and c. The location of the pivot or fulcrum, in mm, to make the brake self-locking for the clockwise rotation of the brake drum.
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