Design a cast iron driven pulley to transmit 20 kW at 300 r.p.m. The diameter of the pulley is 500 mm and the angle of lap is 180°. The pulley has four arms of elliptical cross-section with major axis twice the minor axis. The coefficient of friction between the belt and the pulley surface is 0.3. The allowable tension per metre width of the belt is 2.5 N. The following allowable stresses may be taken : Shear stress for the shaft material = 50 MPa, and Bending stress for the pulley arms=15 MPa.

Design a cast iron driven pulley to transmit 20 kW at 300 r.p.m. The diameter of the pulley is 500 mm and the angle of lap is 180°. The pulley has four arms of elliptical cross-section with major axis twice the minor axis. The coefficient of friction between the belt and the pulley surface is 0.3. The allowable tension per metre width of the belt is 2.5 N. The following allowable stresses may be taken : Shear stress for the shaft material = 50 MPa, and Bending stress for the pulley arms=15 MPa.

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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Concept explainers

Axial Load

When a bar of the uniform cross-section is acted by a load, such that the load acts along the longitudinal axis of the bar, such kinds of loadings are known as axial loadings. In general terms, a load is an external force acting on a component. An axial load acts perpendicular to the geometric cross-section of the component. Based on the direction of the application of the load, an axial load can be tensile or compressive. The analysis of bodies under the action of axial loads is generally studied under the branch of mechanics, known as statics.

Question

Design a cast iron driven pulley to transmit 20 kW at 300 r.p.m. The diameter of the pulley is
500 mm and the angle of lap is 180°. The pulley has four arms of elliptical cross-section with
major axis twice the minor axis. The coefficient of friction between the belt and the pulley
surface is 0.3. The allowable tension per metre width of the belt is 2.5 N. The following
allowable stresses may be taken :
Shear stress for the shaft material = 50 MPa, and Bending stress for the pulley arms = 15 MPa.

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