DRWG120_Gears - Gears TOPICS Types of gears Gear...

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Gears
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Types of gears Gear terminology Gear drawing TOPICS
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3 Types of Gears Many types of gears spur, bevel, worm, helical, rack and pinion Each type has its own terminology, drawings requirements, and design considerations. spur gear bevel gears worm gear helical gear rack and pinion
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4 Terminology – Spur Gear
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5 Gear Terms Pitch Diameter The diameter of an imaginary circle on which the gear tooth is designed Number of Teeth The number of teeth on the gear Diametral Pitch A ratio of the number of teeth to a unit length of pitch diameter Outside Diameter The overall gear diameter
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6 Gear Terms Root Diameter The diameter at the bottom of the tooth Addendum The radial distance from the pitch circle to the top of the tooth Dedendum The radial distance from the pitch circle to the bottom of the tooth
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7 Gear Terms Whole Depth The overall height of the tooth Clearance The radial distance between the bottom of one tooth and the top of the mating tooth Circular Pitch The distance measured from the point of one tooth to the corresponding point on the adjacent tooth on the circumference of the pitch diameter
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8 Gear Terms Circular Thickness The thickness of a tooth or space measured on the circumference of the pitch diameter Chordal Thickness The thickness of a tooth or space measured along a chord on the circumference of the pitch diameter Chordal Addendum The perpendicular distance from the chord to the outside circumference of the gear
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9 Gear Term Pressure Angle The angle between the direction of pressure between contacting teeth and a line tangent to the pitch circle
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10 Formulas – Spur Gear 14.5°or 20°CL = 0.157*MDL 14.5°or 20°CL = 0.157/DP 14.5°or 20°WD = 2.157*MDL 14.5°or 20°WD = 2.157/DP 14.5°or 20° DED = 1.157*MDL 14.5°or 20° DED = 1.157/DP 14.5°or 20° ADD = MDL 14.5°or 20° ADD=1/DP 20°stub CL = 0.2*MDL 20°stub CL = 0.2/DP Clearance CL 20°stub WD = 1.8*MDL 20°stub WD = 1.8/ DP Whole depth WD 20°stub DED = MDL 20°stub DED = 1/DP Dedendum DED 20°stub ADD = 0.8*MDL 20°stub ADD = 0.8/DP Addendum ADD DP = N/PD Diametral pitch DP MDL = PD/N Module MDL N = PD/MDL N = PD*DP Number of teeth N PD = MDL*N PD = N/DP Pitch diameter PD Metric gears Inch gears Term
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This note was uploaded on 02/02/2012 for the course DRAW 101 taught by Professor Laosimkim during the Spring '11 term at University of Macau.

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DRWG120_Gears - Gears TOPICS Types of gears Gear...

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