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FundamentalConceptsforGears

# Seechapter14and15 fordetailsherestraightbevelgearwill

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Unformatted text preview: radial and axial co mponents, which does no work, but tends to push gears apart. W The components are related by: W r = W t × tan f × cos g , W a = W t × tan f × sin g , where f is ­ pressure angle, g is shaft angle [=tan 1 (Np/NG)]. The total acting force between the mating gears is W = (W t ) 2 + (W r ) 2 + (W a ) 2 The transmitted power: W t (pd avg n ) Power = (in kW), where Wt is in kN, davg in mm, and n in rev/min 60000 o r ) W t (pd avg n Power = (in hp), where Wt is in lbf, davg in inch, and n in rev/min 33000 12 STRENGTH ANALYSIS Lewis equation: (based on several assumptions as follows) 1. Full load applied to the tip of a single tooth 2. Radial co mponent is negligible 3. Load is uniformly distributed along full face width 4. Force due to tooth sliding friction are negligible 5. Stress concentration in the tooth fillet is negligible 6. Maximum stress probably occurs while a single pair of gear teeth is carrying the full load, at a point where another pair of teeth is just on the verge of coming in...
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