Machine Design II - Gear Design

# Machine Design II- - Tooth Thickness(t = p/2.157/2 =.0785 Gear 1 40 Teeth Pitch Diameter(d 1 = N 1/P 40 teeth/20 = 2” r b1 = r cos φ 1”x cos

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Machine Design II Project #1 Gear Design Part 1: Speed Ratio 4:1 Pressure Angle 14.5° Diametral Pitch(P) 20 teeth/inch Addendum(a) = 1/P 1/20 = .05 Dedendum(b) = 1.25/P 1.25/20 = .0625 Circular Pitch(p) = π/P π/20 = .157 Tooth Thickness(t) = p/2 .157/2 = .0785 Gear 1: - 40 Teeth Pitch Diameter(d 1 ) = N 1 /P 40 teeth/20 = 2” r b1 = r cos φ 1”x cos 14.5° = .9681” Gear 2: - 10 Teeth Pitch Diameter(d 1 ) = N 1 /P 10 teeth/20 = .5” r b2 = r cos φ .25”x cos 14.5° = .2420”

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Part 2: Speed Ratio 4:1 Pressure Angle 20° Diametral Pitch(P) 20 teeth/inch Addendum(a) = 1/P 1/20 = .05 Dedendum(b) = 1.25/P 1.25/20 = .0625 Circular Pitch(p) = π/P π/20 = .157
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Unformatted text preview: Tooth Thickness(t) = p/2 .157/2 = .0785 Gear 1:- 40 Teeth Pitch Diameter(d 1 ) = N 1 /P 40 teeth/20 = 2” r b1 = r cos φ 1”x cos 20° = .9396” Gear 2:- 10 Teeth Pitch Diameter(d 1 ) = N 1 /P 10 teeth/20 = .5” r b2 = r cos φ .25”x cos 20° = .2349” Advantages/Disadvantages Teeth with a 20 degree pressure angle are stronger than those with smaller pressure angles(14.5), however, they run louder. The smaller the pressure angle the thinner the teeth will be. Older gears with a 14.5 degree pressure angle will not be as strong as modern 20 degree gears....
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## This note was uploaded on 11/16/2009 for the course CVEG 3013 taught by Professor Mike during the Spring '09 term at Baylor.

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Machine Design II- - Tooth Thickness(t = p/2.157/2 =.0785 Gear 1 40 Teeth Pitch Diameter(d 1 = N 1/P 40 teeth/20 = 2” r b1 = r cos φ 1”x cos

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