A flat open belt drive is used to transmit apower of 22 kW from a motor shaft rotatingat 950 rpm. The radius of the pulley of themotor shaft is 125 mm while the radius ofthe pulley of the driven shaft is 450 mm. Thecenter distance between the shafts is 2,250mm. The coefficient of friction is 0.25 andthe density of the belt material is 950kg/m3. The belt width is 120 mm. Theallowable stress is 2.1 MPa. Determine thethickness of the belt. Express your finalanswer in mm and use ONE decimal place.Write only the numerical value and do nottype the unit anymore.

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Answered: A flat open belt drive is used to…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A multiple V-belt drive is required to transmit 4 kW. The smaller pulley of the system is150 mm diameter, rotates at 200 rev/min, and has an angle of lap angle of 135°. Thegrove angle is 40° and the coefficient of friction between the belt and the pulleys is 0·3.If the maximum tension in any one belt is limited to 800 N, calculate:(a) The number of belts required. (b) The minimum tension in any one belt. (c) The required pre-tensioning of the belt. The centre-to-centre distance between the pulleys is 2 m.(d) Determine to the nearest mm, the required size for the larger pulley.(e) Find the approximate length of the belt
A multiple vee-belt drive is required to transmit 4 kW. The smaller pulley has of the systemhas a diameter 150 mm and rotates at 200 rev/min. The grove angle is 40° and thecoefficient of friction between the belt and pulley is 0·3.(a) If the maximum tension in any one belt is limited to 800 N and the angle of lap is135°, determine the number of belts required. (b) Determine also, the initial pre-tension required in the belt.
Prob # 9. Find the horsepower transmitted by a pair of friction wheels, the diameter of driving wheel is 10 inches, and it revolves at 200 rpm. The width of the wheel is 2 inches. The force per inch width of face is 150 pound and the coefficient of friction is 0.20. a. 96 hp b. 23 hp c. 1.2 hp d. 1.6 hp
A multiplate clutch has three pairs of contact surfaces. The outer and inner radii of the contact surfaces are 100 mm and 50 mm respectively. The maximum axial spring force is limited to 1 kN. If the coefficient of friction is 0.35 and assuming uniform wear, find the power transmitted by the clutch at 1500 r.p.m.
A v-belt drive is to transmit 330kW power from a pulley of 1m diameter running at 250rpm. The safe pull in each belt is 800N and the mass of the belt is 0.46kg per meter length. The angle of lap and the groove angle is 160º and 45ºrespectively. If the coefficient of friction between the belt and the pulley is 0.3. Calculate the number of belts required
Power is transmitted between two shafts by a V-belt whose mass is 0.9 kg/m length. The maximum permissible tension in the belt is limited to 2.2 kN. The angle of lap is 170° and the groove angle 45°. If the coefficient of friction between the belt and pulleys is 0.17, find : 1. velocity of the belt for maximum power; and 2. power transmitted at this velocity. Note: Sketch the belt drive system for both parts and label the given data on it.
Two parallel shafts whose centre lines are 4 m apart, are connected by an open belt drive. The diameter of the larger pulley is 1.8 m and that of smaller pulley 3 m. The initial tension in the belt when stationary is 3 kN. The coefficient of friction between the belt and the pulley is 0.3. Calculate the power transmitted, when the smaller pulley rotates at 550 r.p.m. and length of the belt.
8. A cross belt arrangement has centre distance between pulleys as 1.5 m. The diameter of bigger and smaller pulleys are 'D' and 'd' respectively. The smaller pulley rotates at 1000 r.p.m. and the bigger pulley at 500 r.p.m. The flat belt is 6 mm thick and transmits 7.5 kW power at belt speed of 13 m/s approximately. The coefficient of belt friction is 0.3 and the density of belt material is 950 kg/m³. If the permissible tensile stress for the belt material is 1.75 MPa, calculate: 1. Diameters of pulleys; 2. Length and width of belt. [Ans. 500 mm, 250 mm ; 4.272 m, 90 mm]
Two parallel shafts 5 m apart are connected by open flat belt drive. The diameter of the bigger pulley is 1.5 m and that of the smaller pulley 0.75 m. The initial tension in the belt is 2.5 kN. The mass of the belt is 1.25 kg/m length and coefficient of friction is 0.25. Taking centrifugal tension into account, find the power transmitted, when the smaller pulley rotates at 450 rpm
A fan is driven by a belt from a motor which runs at 880 rpm. A medium double ply leather belt 8 mm thick and 250 mm wide is used. The diameters of the motor pulley and the driven pulley are 350 mm and 1370 mm. The center distance is 1370 mm, and both pulleys are made of cast iron. Coefficient of friction of leather on cast iron is 0.35. The allowable stress for the belt is 2.4 MPa, which allows for the factor of safety and also for the fact that a double ply belt does not have double the capacity of a single ply belt. (A double ply belt has approximately 85% the capacity of a single ply belt of the same thickness.) The belt density p =970 kg/m^3. What is the power capacity? (Answer: 39.1 kW ) -0350 -1370
An engine of a motor vehicle with a wheel diameter of 712 mm develops 50 kW at 2,000 rpm combined efficiencyof the differential and transmission is 75% with an over-all speed reduction to. 1 determine he torque to bedelivered by the clutch N-m.
8. An open belt drive running at 2.5 m/s transmits 2.5 kW. The angle of lap on the smaller pulley is 165° and coefficient of friction between belt and pulley being 0.30. Determine the efect on power transmission if initial tension is increased by 10%.

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