There are two pairs of closed soft tooth surface spur gears A and B,Parameters of A: modulus m = 2mm, number of teeth Z1 = 40, Z2 = 90 , width of teeth b = 60mm.Parameters of B : modulus m = 4mm, number of teeth Z1 = 20, Z2 = 45 , width of teeth b = 60mm.The accuracy of the two pairs of gears is grade8, and other conditions are the same. Try to compare the contact fatigue strength and bending fatigue strength of the two pairs of gears? And explain the reason.

Two parts of spur gears-For Gear A-modulus, m=2mmAccuracy oftwo pairs of gear is = grade 8.

Answered: There are two pairs of closed soft…

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Author:Kreith, Frank; Manglik, Raj M.

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Chapter4: Numerical Analysis Of Heat Conduction

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There are two pairs of closed soft tooth surface spur gears A and B,
Parameters of A: modulus m = 2mm, number of teeth Z₁=40, Z₂ = 90 , width of teeth b = 60mm.
Parameters of B : modulus m = 4mm, number of teeth Z₁ = 20, Z₂ = 45 , width of teeth b = 60mm.
The accuracy of the two pairs of gears is grade8, and other conditions are the same. Try to compare the contact fatigue strength and bending fatigue strength of the two pairs of gears? And explain the reason.

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