ME8651 – NOTES & QP
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ME8651 – SYLLABUS
UNIT I DESIGN OF FLEXIBLE ELEMENTS
Design of Flat belts and pulleys — Selection of V belts and pulleys — Selection of hoisting wire ropes and pulleys — Design of Transmission chains and Sprockets.
UNIT II SPUR GEARS AND PARALLEL AXIS HELICAL GEARS
Speed ratios and number of teeth-Force analysis -Tooth stresses — Dynamic effects — Fatigue strength — Factor of safety — Gear materials — Design of straight tooth spur & helical gears based on strength and wear considerations — Pressure angle in the normal and transverse plane- Equivalent number of teeth-forces for helical gears.
UNIT III BEVEL, WORM AND CROSS HELICAL GEARS
Straight bevel gear: Tooth terminology, tooth forces and stresses, equivalent number of teeth. Estimating the dimensions of pair of straight bevel gears. Worm Gear: Merits and demerits- terminology. Thermal capacity, materials-forces and stresses, efficiency, estimating the size of the worm gear pair. Cross helical: Terminology-helix angles-Estimating the size of the pair of cross helical gears.
UNIT IV GEAR BOXES
Geometric progression — Standard step ratio — Ray diagram, kinematics layout -Design of sliding mesh gear box — Design of multi speed gear box for machine tool applications — Constant mesh gear box — Speed reducer unit. — Variable speed gear box, Fluid Couplings, Torque Converters for automotive applications.
UNIT V CAMS, CLUTCHES AND BRAKES
Cam Design: Types-pressure angle and under cutting base circle determination-forces and surface stresses. Design of plate clutches –axial clutches-cone clutches-internal expanding rim clutches- Electromagnetic clutches. Band and Block brakes — external shoe brakes — Internal expanding shoe brake.