9. A pivoted double block brake as shown in figure below has two shoes that subtend an angle of (20) 100°. The diameter of the brake drum is 500 mm and width of the friction lining is 100 mm. The coefficient of friction is 0.2 and the maximum intensity of pressure between lining and brake drum is 0.5 N/mm?. The pivot of each shoe is located in such a manner that the moment of the frictional force on the shoe is zero. Calculate the torque capacity of each shoe. Page 3 of 5 Drum Pivoted Shoes

9. A pivoted double block brake as shown in figure below has two shoes that subtend an angle of (20) 100°. The diameter of the brake drum is 500 mm and width of the friction lining is 100 mm. The coefficient of friction is 0.2 and the maximum intensity of pressure between lining and brake drum is 0.5 N/mm?. The pivot of each shoe is located in such a manner that the moment of the frictional force on the shoe is zero. Calculate the torque capacity of each shoe. Page 3 of 5 Drum Pivoted Shoes

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.57P: The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a...

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A differential band brake is shown in the figure. The diameter of the drum is 800 mm. The coefficient of friction between the band and the drum is 0.3 and the angle of embrace is 240°. When a force of 777 N is applied at the free end of the lever, find: a. The maximum force, in Newtons, in the band for the clockwise rotation of the drum b. The minimum force, in Newtons, in the band for the clockwise rotation of the drum c. The maximum force, in Newtons, in the band for the counter clockwise rotation of the drum d. The minimum force, in Newtons, in the band for the counter clockwise rotation of the drum e. The torque which can be applied by the brake, in N-m, for the clockwise rotation of the drum.
For the drum brake shown in the following figure, there is an inner rim diameter of 280 mm and dimension a = 90 mm. The shoes have a face width of 30 mm. The force exerted by the cylinder hydraulic is 1000 N and the average coefficient of friction is 0.3. Determine: a) The maximum pressure in each shoe; b) The braking torque; c) Reactions resulting from the pivot pin;
Two pulleys, one 650 mm diameter and the other 400 mm diameter, on parallel shafts 1.5 m apart are connected by a flat belt. Find the length of the belt required and the angle of contact between the belt and each pulley. What power can be transmitted by the belt when the larger pulley rotates at 1200 rev/min, if the maximum permissible tension in the belt is 10 kN, and the coefficient of friction between the belt and pulley is 0.05? dont write handwritten solution.
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A band brake is installed on a drum rotating at 250 rpm, and a diameter of 900 mm. The angle of contact is 1.5 pi radians and one end of the brake band is fastened to a fixed pin while the other end of the brake arm is 150 mm from the fixed pin. The coefficient of friction is 0.25 and the straight brake arm is 1000 mm long and is placed perpendicular to the diameter bisecting the angle of contact. Determine the net band pull in kN applied at the end of the brake arm if 50 kW is being absorbed.
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