MECHANICAL ENGINEERING DES.(LL)-W/CNCT
15th Edition
ISBN: 9781260531374
Author: BUDYNAS
Publisher: MCG
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Chapter 16, Problem 14P
The figure depicts a band brake whose drum rotates counterclockwise at 200 rev/min. The drum diameter is 16 in and the band lining 3 in wide. The coefficient of friction is 0.20. The maximum lining interface pressure is 70 psi.
(a) Find the maximum brake torque, necessary force P, and steady-state power.
(b) Complete the free-body diagram of the drum. Find the bearing radial load that a pair of straddle-mounted bearings would have to carry.
(c) What is the lining pressure p at both ends of the contact arc?
Problem 16–14
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A block brake with a torque of 250 N-m. Its drum rotates at 100 rpm. The length of the block (1) is twice its width (w). Assume, the coefficient of friction P is 0.35. Calculate: (1) the applied load (P) and the hinge-pin reaction (Rx ana Ry) for clockwise rotation of the drum; (2) the applied load and hinge-pin reaction for anticlockwise rotation of the drum; (3) the rate of heat generated during the braking action. (4) The dimensions of the block, if the intensity of pressure between the block and brake drum is 1 MPa. (5) Check whether the brake is self-locking.
The figure shows an internal rim-type brake having an inside rim diameter of 11in and a dimension R of 3.5 in. The shoes have a face width of 1.25 in. Find the braking torque and the maximum pressure for each shoe if the actuating force is 205 Ibf, the drum rotation is counterclockwise, and f=0.32. The maximum pressure on the right-hand shoe parp is [ 16.99] @ psi. The maximum pressure on the left-hand shoe pa| H is [100.813 | @ psi. The torque on the right-hand shoe Tgis [ .056 | @ kipin. The torque on the left-hand shoe T is [ .332| @ kipin. Total braking torque Tiotal s [-3887] @ Kip-in.
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.
Chapter 16 Solutions
MECHANICAL ENGINEERING DES.(LL)-W/CNCT
Ch. 16 - The figure shows an internal rim-type brake having...Ch. 16 - For the brake in Prob. 16-1, consider the pin and...Ch. 16 - In the Figure for Prob. 16-1, the inside rim...Ch. 16 - The figure shows a 400-mm-diameter brake drum with...Ch. 16 - The block-type hand brake shown in the figure has...Ch. 16 - Suppose the standard deviation of the coefficient...Ch. 16 - The brake shown in the figure has a coefficient of...Ch. 16 - Prob. 8PCh. 16 - Prob. 9PCh. 16 - Prob. 10P
Ch. 16 - The maximum band interface pressure on the brake...Ch. 16 - The drum for the band brake in Prob. 1611 is 12 in...Ch. 16 - The brake shown in the figure has a coefficient of...Ch. 16 - The figure depicts a band brake whose drum rotates...Ch. 16 - The figure shows a band brake designed to prevent...Ch. 16 - A plate clutch has a single pair of mating...Ch. 16 - A hydraulically operated multidisk plate clutch...Ch. 16 - Prob. 18PCh. 16 - A cone clutch has D = 12 in, d = 11 in, a cone...Ch. 16 - Prob. 20PCh. 16 - A two-jaw clutch has the dimensions shown in the...Ch. 16 - Prob. 22PCh. 16 - Prob. 23PCh. 16 - Prob. 24PCh. 16 - Using the data of Table 16-6, find the mean output...Ch. 16 - When a motor armature inertia, a pinion inertia,...Ch. 16 - For the conditions of Prob. 1627, make a plot of...Ch. 16 - Prob. 29PCh. 16 - Prob. 30PCh. 16 - Prob. 31P
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