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- Solve Sample Problem 7.16 if the contact pressure under the polisher varies parabolically from p0 at r=0 to zero at r=R; that is, p=p0(1r2/R2).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.A conical clutch has an included angle of 120°, a coefficient of friction of 0.4, and outer and inner diameters of 85mm and 18mm respectively. Using both the uniform wear theory and the uniform pressure theory, calculate the force required to press the two halves together if it is to transmit 300W at 750rev/min. The uniform wear theory and the uniform pressure theory deliver different values for torque in the same system. Which theory would be preferred in practice for use in calculations involving a friction clutch? Give reasons for your choice.
- 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 single plate friction clutch with both sides of plate being effective is used to transmit power at an engine speed of 200rpm. It has outer and inner radii 10cm and 8cm respectively. Find maximum power transmitted and the corresponding axial thrust, if the maximum intensity of pressure is not to exceed 0.08N/mm2 . Assume coefficient of friction as 0.25.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? give proper explaination and dont give handwritten solution.
- 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.A local utility vehicle production company have considered using in one of its design a multi-disc clutch consisting of a 9 steel disc and 8-bronze discs with effective outside and inside diameter of 220mm and 160mm, respectively. If the shaft turns at 150rpm and an axial force of 600N is applied, find the horsepower capacity, considering a coefficient of friction of 0.25A leather-faced cone clutch has a contact surface with a mean diameter of 15 in. and transinits 20 hy turning at 800 rpm. For a cone angle of 20 degrees and a coefficient of friction 0.30, determine the force required to keep the surface in contact. Ans. 121.5 lb.
- Determine the principal dimensions of a cone clutch faced with lather to transmit 40 kW at 800 r.p.m. from an electric motor to an air compressor. Sketch a sectional front view of the clutch and provide the main dimensions. Assume that the semi-angle of the cone is 10°, the coefficient of friction is 0.3, mean diameter of cone is (7-10)d, where d is the diameter of the shaft, allowable normal pressure for lather and cast iron is 0.1 to 0.2 N/mm, shear stress 100 N/mm², load factor is 2 and the mean diameter to face width ratio is 6.A cone clutch has cone elements at an angle of 12o. The clutch transmit 25 HP at a speed of 1200 rpm. The mean diameter of the conical friction section is 16 in and the coefficient of friction is 0.35. Find the axial force needed to engage the clutch.Find the power transmitted by a belt running over a pulley of 600 mm diameter at200 r.p.m. The coefficient of friction between the belt and the pulley is 0.25,angle of lap 160° and maximum tension in the belt is 2500 N.