DESIGN OF TRANSMISSION SYSTEMS , GEARS AND PARALLEL AXIS HELICAL GEARS , BEVEL , WORM AND CROSS HELICAL GEARS , DESIGN OF GEAR BOXES , DESIGN OF CAM CLUTCHES AND BRAKES ,
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To gain knowledge on the principles and procedure for the design of power Transmission
components. To understand the standard procedure available for Design of Transmission sip
terms To learn to use standard data and catalogues
UNIT I DESIGN OF TRANSMISSION SYSTEMS FOR FLEXIBLE ELEMENTS 9
Selection of V belts and pulleys-selection of Flat belts and pulleys-Wire ropes and pulleys –
Selection of Transmission chains and Sprockets.Design of pulleys and sprockets.
UNIT II SPUR GEARS AND PARALLEL AXIS HELICAL GEARS 9
Gear Terminology-Speed ratios and number of teeth-Force analysis -Tooth stresses Dynamic
effects - Fatigue strength - Factor of safety - Gear materials – Module and Face width-power
rating calculations based on strength and wear considerations Parallel axis Helical Gears –
Pressure angle in the normal and transverse plane-Equivalent number of teeth-forces and
stresses. Estimating the size of the helical gears.
UNIT III BEVEL, WORM AND CROSS HELICAL GEARS 9
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
demeritsterminology.Thermal capacity, materials-forces and stresses, efficiency, estimating
the size ofthe worm gear pair. Cross helical: Terminology-helix angles-Estimating the size of
the pair of
cross helical gears.
UNIT IV DESIGN OF GEAR BOXES 9
Geometric progression - Standard step ratio -Ray diagram, kinematics layout -Design of
mesh gear box -Constant mesh gear box. – Design of multi speed gear box.
UNIT V DESIGN OF CAM CLUTCHES AND BRAKES 9
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-internal and external shoe brakes.
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