Machine Design_slide 17

Machine Design_slide 17 - ENGR3220MachineDesign...

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ENGR 3220 – Machine Design ENGR 3220 – Machine Design March 23 March 23 rd rd , 2011 , 2011 Gears: Force Analysis Gears: Force Analysis
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Spur Gears Force Analysis dn H W t π ) 10 ( 60 3 = F 32 t is called transmitted load W t , in SI unit system, following equation exists: H: transmitted power (kW) d: pitch diameter (mm) n: speed (rpm) W t : transmitted load (KN)
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Spur Gears Force Analysis n H T a 63025 2 = For British Units: H: transmitted power (hp) T a2 : transmitted torque (lbf.in) n: speed (rpm)
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Straight Bevel Gears The pitch of bevel gears is measured at the large end of the tooth. The pitch angle is given by: G P N N = γ tan
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Force Analysis-Bevel Gearing γ φ sin tan cos tan cos t a t r t W W W W W W = = =
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Helical Gearing pitch diametral P pitch circlular p P P p p t n t n : : cos cos ψ = =
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Force Analysis-Helical Gearing ψ φ sin cos cos cos sin n a n t n r W W W W W W = = =
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Worm Gears The nomenclature of a worm gear is shown in left figure. The worm and
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This note was uploaded on 04/16/2011 for the course ENGR 3220 taught by Professor Turro during the Spring '11 term at UOIT.

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Machine Design_slide 17 - ENGR3220MachineDesign...

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