Q1/ Figure shows a single block brake applied to a drum by a lever AB which is pivoted at a fixed point A. The radius of the drum is 160 mm. The coefficient of friction at the brake lining is 0.3 and the angle of contact is 40°. If the drum rotates anticlockwise, find the braking torque due to the applied force of 600 N at B. 14-200-> mm 600 N
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- The figure shows an internal rim-type brake having an inside rim diameter of 300 mm and a dimension R 5 125 mm. The shoes have a face width of 40 mm and are both actuated by a force of 2.2 kN. The drum rotates clockwise. The mean coefficient of friction is 0.28. a. Find the maximum pressure and indicate the shoe on which it occurs. b. Estimate the braking torque effected by each shoe, and find the total braking torque. c. Estimate the resulting hinge-pin reactions. 30°- 30°. R 120° 120° Pin Pin 30° 30° Figure 3: An internal rim-type brakeQ5: The block brake, as shown, provides a braking torque of 360 N.m The diameter of the brake drum is 300 mm. The coefficient of friction is 0.3. Find 1. the force (P) to be applied at the end of the lever for the clockwise and counter clockwise rotation of the brake drum, and 2. The location of the pivot or fulcrum to make the brake self-locking for the clockwise rotation of the brake dracs 100 10 ( F₁ 4 μ sin 80 20+ sin20 T = (F₁) r Bearing Area A, b(2r sind) RN = (1 20 R 600 Brake drumPlease, reaply as soon as posible! Static Problem The band brake shown controls the rotation of the drum. The coefficient of friction between the belt and the drum is 0.25. The weight of the lever is negligible.Determine the force P that must be applied at the end of the braking lever to resist a torque T = 200 lb in, if the torque is applied in the: a) Clockwise b) Counterclockwise direction.
- The band brake of Fig. is used to control the rotation of a drum. The coefficient of friction between the belt and the 36° V-pulley is 0.15, and the weight of the han- dle is 15 N. If a force of 200 N is applied to the end of the handle, determine the maximum torque for which no mo- tion occurs if the torque is applied Clockwise. 150 mm T 200 N 60 150 mm -675 mm 75 mmThe band brake of Fig. is used to control the rotation of a drum. The coefficient of friction between the belt and the 40 V-pulley is 0.10. The weight of the handle is 2 lb. If a force of 50 lb is applied to the end of the han- dle, determine the maximum torque for which no motion occurs if the torque is applied Counterclockwise. 50 Ib 3 in. +9 in- 18 in.-The band brake of Fig. is used to control the rotation of a drum. The coefficient of friction between the belt and the 40 V-pulley is 0.10. The weight of the handle is 2 lb. If a force of 50 lb is applied to the end of the han- dle, determine the maximum torque for which no motion occurs if the torque is applied Clockwise. 50 Ib 3 in. +9 in- 18 in.-
- 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 PThe band of a brake has a contact angle of 18° deg. If the pulls on the bands are 275 kg and 100 kg, find the coefficient of friction.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
- Q2/ Arm ABC acts as a brake on the wheel as shown in Fig. 2. The coefficient of static friction at B is pB = 0.4. Determine the largest moment M that can act on the wheel without causing it to slip? Radius = 200 mm 100 N M 300 шn O B Figure 2 400 mm A 200 mmThe figure below shows the essential parts of a hydraulic brake system. The area of the piston in the master cylinder is 1.8 cm² and that of the piston in the brake cylinder is 6.4 cm2. The coefficient of friction between shoe and wheel drum is 0.50. If the wheel has a radius of 37 cm, determine the frictional torque about the axle when a force of 50 N is exerted on the brake pedal. N. m Wheel drum Pedal Shoe Master cylinder cylinder BrakeThe band brake of Fig. is used to control the rotation of a drum. The coefficient of friction between the belt and the 36° V-pulley is 0.15, and the weight of the han- dle is 15 N. If a force of 200 N is aPplied to the end of the handle, determine the maximum torque for which no mo- tion occurs if the torque is applied Counterclockwise. 150 mm T 200 N 60 150 mmi 675 mm 75 mm