Q7/ A differential band brake has a force of 220 N applied at the end of a lever as shown in Figure. The coefficient of friction between the band and the drum is 0.4. The angle of lap is 180°. Find (a) the maximum and minimum tension in the band, when a torque of 450 N-m is applied to the drum which rotate clockwise; and (b) the maximum torque that the brake may sustain for anticlockwise rotation of the drum. 150 B 100- 200

Q7/ A differential band brake has a force of 220 N applied at the end of a lever as shown in Figure. The coefficient of friction between the band and the drum is 0.4. The angle of lap is 180°. Find (a) the maximum and minimum tension in the band, when a torque of 450 N-m is applied to the drum which rotate clockwise; and (b) the maximum torque that the brake may sustain for anticlockwise rotation of the drum. 150 B 100- 200

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...

See similar textbooks

Similar questions

Form the figure shown, a flexible belt placed around a rotating drum of 4-inch radius acts as a brake when the arm ABCD is pulled down by the force P. The coefficient of kinetic friction between the belt and the drum is 0.7. What force P that would result in a braking torque of 400 lb. in., assuming that the drum is rotating counterclockwise. Neglect the weight of the brake arm. 60° 4 in. 60° B 1-2-4² m-4-2m- in.- 4 in. in.- D Р
4.) A flat belt makes contact with an 16 in. diameter pulley through half its circumference. If the coefficient of friction is 0.45 , and a torque of300ft−bsis to be transmitted, calculate the belt tensions. (please type answer not write by hend)
Q6/ A differential band brake has a force of 220 N applied at the end of a lever as shown in Figure. The coefficient of friction between the band and the drum is 0.35 The angle of lap is 180°. Find the maximum and minimum tension in the band, when a torque of 600 N-m is applied to the drum which rotates 150 clockwise. 220 N A 100- 200 All dimensions in mn. (Good Luck) دحسن حمودي مهدي مدرس المادة ASO porte e axis min er bos plg neowled 30 id 40 metni im - 214. arli
Form the figure shown, a flexible belt placed around a rotating drum of 4-inch radius acts as a brake when the arm ABCD is pulled down by the force P. The coefficient of kinetic friction between the belt and the drum is 0.7. What force P that would result in a braking torque of 400 lb . in., assuming that the drum is rotating Neglect the weight of the counterclockwise. brake arm. 60° 4 in. 60° A B C -2 in.²4in. 2 in. 42×-| -2 D P
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.
Form the figure shown, a flexible belt placed around a rotating drum of 4-inch radius acts as a brake when the arm ABCD is pulled down by the force P. The coefficient of kinetic friction between the belt and the drum is 0.7. What force P that ● would result in a braking torque of 400 lb • in., assuming that the drum is rotating counterclockwise. Neglect the weight of the brake arm. 60° 4 in.. A B |--2 in.-² 4 in. 1-2 60° 2 in. D Р
A flat belt passes over two idler pulleys and under a rotating drumof diameter 8 in. The axle of the drum is free to move vertically ina slot, and a spring keeps the drum in contact with the belt. Whatis the minimum force which should be exerted by the spring if slippageis not to occur when a 30-lb · ft torque is applied to the drum? Thecoefficient of static friction between belt and drum is 0.30 and theangle of contact is 180 degrees.
The block-type parking brake shown in the figure has a width of 49 mm and an average friction coefficient of 0.32. Calculate the maximum pressure and braking moment on the shoe to provide a thrust of 419 N in the anti-clockwise system?
5. Blocks A and B weigh 250N and150N, respectively. Using the coefficients of static friction indicated as in Figure S6, i. Draw the free body diagram for the pulley C, pulley D, block A and block B State the equation of the tensions T, and Tc in the terms of W for both of the pulley system. i. (Assume that slip impends between the pulley and the block E. W is the weight of the block E) iii. Determine the greatest weight W of the block E without causing motion 0.45 m He =0.2 A 0.6m 4,= 0.3 HD =0.3 H = 0.5 5 12
Q3: A block brake with a torque of 250 N-m. Its drum rotates at 100 rpm. The H 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 & O. 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. F T = (F₁) r RN = = JA V = 21 N T P = RN wl 60 Rate of heat generated frictional force* average velocity xHa 300 عمل 200 Ry www Cook 28 200 Rx 50 All dimensions in mm
I need correct answer At stationary the tension in pulley 120N. Find tension in each side and Power trans when belt is on the point of slipping on smaller wheel. The wheel is 250mm diameter and fac F Friction 0.32. The angle of Lap 165⁰. The wheel speed 1200 C/min.
The hand brake of Fig. is used to control the rotation of a drum. The coefficient of friction between the belt and the drum is , = 0.15, and the weight of the handle may be neglected. If a counterclockwise torque of 5 ft - Ib is applied to the drum Repeat the problem for a clockwise torque of 5 ft · Ib. What happens to the system at a 4.6 in.? What does the solution mean for a> 4.6 in.? M= 5 lb-ft -12 in. 12 in