Unit 1Spur and Helical Gears Introduction to gears : Material selection for gears, Modes of gear tooth failure, Gear Lubrication Methods. Spur Gears : Number of teeth and face width, Force analysis, Beam strength (Lewis) equation, Velocity factor, Service factor, Load concentration factor, Effective load on gear, Wear strength (Buckingham’s) equation, Estimation of module based on beam and wear strength, Estimation of dynamic tooth load by velocity factor and Buckingham’s equation. AGMA (American Gear Manufacturing Association) approach of Gear design (Only mathematical relations, no numerical) Helical Gears : Force analysis of Helical Gear, Beam Strength of Helical Gear, Wear strength and estimation of effective load based on Velocity factor (Barth factor) and Buckingham’s equation. (No numerical on force analysis of helical) (Chapters - 1, 2) Unit 2Bevel and Worm Gear Bevel Gears : Types of Bevel gears, Terminology, Virtual number of teeth, and force analysis of Straight Bevel Gear. Design of Straight Bevel Gear based on Beam Strength, Wear strength and estimation of effective load based on Velocity factor (Barth factor) and Buckingham’s equation. (Simple numerical to be taken no design calculations) Worm Gears : Worm and worm gear terminology and proportions of worm and worm gears, Force analysis of worm gear drives, Friction in Worm gears, efficiency of worm gears, Worm and worm gear material, Strength and wear ratings of worm gears (Bending stress factor, speed factor, surface stress factor, zone factor) IS 1443-1974, Thermal consideration in worm gear drive. (Simple numerical to be taken no design calculations) (Chapters - 3, 4) Unit 3Sliding and Rolling Contact Bearing Sliding contact bearing (Theoretical treatment only) : Introduction to sliding contact bearing, classification, Reynolds’s equation (2D), Petroff’s equations, Sommerfeld number, Parameters of bearing design. Rolling Contact Bearings : Types of rolling contact Bearings and its selection, Stat
