A flat collar bearing has an external diameter which is 1.6 times the intenal diameter. The coefficient of friction is 0.05 and the maximum bearing pressure is 270 kN/cm^2. The axial load is 20 kN and power absorbed due to friction is 30 kW when the shaft rotates at 750 rpm. If the bearing becomes worm so that the bearing presuure is inversly proportional to the radius, the total axial force and the speed of rotation remaining the same as before, calculate (a) the bearing radii (b) the wear constant (c) the number of collars required

A flat collar bearing has an external diameter which is 1.6 times the intenal diameter. The coefficient of friction is 0.05 and the maximum bearing pressure is 270 kN/cm^2. The axial load is 20 kN and power absorbed due to friction is 30 kW when the shaft rotates at 750 rpm. If the bearing becomes worm so that the bearing presuure is inversly proportional to the radius, the total axial force and the speed of rotation remaining the same as before, calculate (a) the bearing radii (b) the wear constant (c) the number of collars required

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

See similar textbooks

Similar questions

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
In a thrust bearing, the external and the internal diamaters of the contacting surfaces are 320 mm and 200 mm respectively. The total axial load is 80 kN and the intensity of pressure is 350 kN/m2.The shaft rotates as 400 rpm. Taking the coefficient of friction as 0.06, calculate the power lost in overcoming the friction. Also, find the number of collars required for the bearing.
Question 3 An engine of a 2 ton truck develop 30 kW at 600 rpm. The truck is fitted with a cone clutch to increase torque. The cone clutch has an outer diameter of 500 mm and inner diameter of 300 mm. the cone has a face angle of 12.5° and a width of 45 mm. The coefficient of friction of 0.25 and normal pressure on the clutch face is not to exceed 0.1 N/mm? 3.1. Sketch the cone clutch and indicate all dimensions and forces. 3.2. Calculate the axial thrust. 3.3. Calculate axial spring force to engage. 3.4. Derteimine the wear. 3.5. Find torque.
multi-disc clutch has three discs on the driving shaft and two on the driven shaft. The inner diameter of the contact surface is 120 mm. The maximum pressure between the surface is limited to 0.1 N/mm . Find the outer diameter for transmitting 25 kW at 1575 rpm . assume uniform wear condition and coefficient of friction 0.3.
A car engine has its rated output of 120 kW. The maxdmum torque developed is 110 Nm, The clutch used is of single plate type having two active surfaces. Axia! pressure is not to exceed 0.85 bar. External diamater of friction plate is 1.25 times the internal diameter. Determine the dimensions of friction plate and axial force exerted by the spring. Assume uniform wear and coefficient of friction to be 0.3.
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
In a thrust bearing, the external and the internal diameters of the contacting surfaces are. 19 mm and 200 mm respectively. The total axial load is 80 kN and the intensity of pressure is 350 kN/m?. The shaftrtates at 400 rpm. Taking the coeffic. : of fricieơn as 0.Q6 calculate the power lost fi overcoming the frP. Con. Also, find the number of collars required for the bearing. rrs
In a thrust bearing, the external and the intermal diameters of the contacting surfaces are 320 mm and 200 mm respectively. The total axial load is 80 kN and the intensity of pressure is 350 kN/m?. The shaft rotates atę Op rpm. Taking the coefficient of friction as 0.os, calculate the power lost in overcoming the friction. Also, find the number of collars required for the bearing.
An overhang shaft carry a 900mm diameter pulley, whose center is 250mm from the center of nearest bearing. The weight of the pulley is 600N and the angle of lap is 180°.The pulley is driven by motor horizontally to right it, if the permissible tension in the belt is 2650N and the coefficient of friction between the belt and the pulley surface is 0.3, estimate the diameter of the shaft. Note, Neglect centrifugal tension and assume permissible tensile and shear stresses in the shaft as 84MPA and 68MPa respectively.
.A steam engine develops power at mean torque of 18,000 N-m and velocity of 9 m/s. The mean diameter of the flywheel rim is 1.3 meters. The coefficient of fluctuation of speed is 0.03 and the coefficient of fluctuation of energy is 0.21. Determine the thickness of the rim in mm if the width of the rim is twice of its thickness. Assume density of rim material as 7250 kg/m3.
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 cone clutch is to transmit 7.5 kW at 900 rpm. The cone has a face angle of 12o. The width of the face ishalf of the mean radius and the normal pressure between the contact faces is not exceeding0.09Nmm2⁄. Assuming uniform wear and the coefficient friction between contact faces as 0.2. Find themain dimensions of the clutch and the axial force required to engage the clutch.