me-311 machine design - lecture 17
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Instructor: Dr. Samiur Rahman Shah
NUST School of Mechanical and Manufacturing Engineering
ME-311 Machine Designecture 1!
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Gears and Gear Trains
S"ur #ears
In$olute Teeth % &ontact Ratio
Tooth s'stems
#ear Trains % (orce )nal'sis Tooth Stresses % Design
*elical+ ,e$el % orm #ears
*elical #ear
Tooth ro"ortions
(orce )nal'sis
Strength )nal'sis % Design
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Gears and Gear Trains
Strength )nal'sis % Design
orm #ears
0inematics
(orce % Strength )nal'sisoer Rating of orm #earing
,e$el #ears 0inematics
(orce % Strength )nal'sis
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The module m is the ratio of the"itch diameter to the num8er ofteeth. The customar' unit of
length used is the millimeter. Themodule is the inde9 of tooth sie
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SurfaceSpeed
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Than; 'ou