TAILIEUCHUNG - Standard Handbook of Machine Design P39

CHAPTER 33 SPUR GEARS Joseph E. Shigley Professor Emeritus The University of Michigan Ann Arbor, Michigan DEFINITIONS / TOOTH DIMENSIONS AND STANDARDS / FORCE ANALYSIS / FUNDAMENTAL AGMA RATING FORMULAS / DEFINITIONS Spur gears are used to transmit rotary motion between parallel shafts. They are cylindrical, and the teeth are straight and parallel to the axis of rotation. The pinion is the smaller of two mating gears; the larger is called the gear or the wheel. The pitch circle, B in Fig. , is a theoretical circle upon which all calculations are based. The operating pitch circles of. | CHAPTER 33 SPUR GEARS Joseph E. Shigley Professor Emeritus The University of Michigan Ann Arbor Michigan DEFINITIONS TOOTH DIMENSIONS AND STANDARDS I FORCE ANALYSIS FUNDAMENTAL AGMA RATING FORMULAS DEFINITIONS Spur gears are used to transmit rotary motion between parallel shafts. They are cylindrical and the teeth are straight and parallel to the axis of rotation. The pinion is the smaller of two mating gears the larger is called the gear or the wheel. The pitch circle B in Fig. is a theoretical circle upon which all calculations are based. The operating pitch circles of a pair of gears in mesh are tangent to each other. The circular pitch p in Fig. is the distance measured on the theoretical pitch circle from a point on one tooth to a corresponding point on an adjacent tooth. The circular pitch is measured in inches or in millimeters. Note in Fig. that the circular pitch is the sum of the tooth thickness t and the width of space. The pitch diameter d for the pinion and D for the gear is the diameter of the pitch circle it is measured in inches or in millimeters. The module m is the ratio of the theoretical pitch diameter to the number of teeth N. The module is the metric index of tooth sizes and is always given in millimeters. The diametral pitch Pd is the ratio of the number of teeth on a gear to the theoretical pitch diameter. It is the index of tooth size when . customary units are used and is expressed as teeth per inch. The addendum a is the radial distance between the top land F and the pitch circle B in Fig. . The dedendum b is the radial distance between the pitch circle B and the root circle D in Fig. . The whole depth ht is the sum of the addendum and dedendum. The clearance circle C in Fig. is tangent to the addendum circle of the mating gear. The distance from the clearance circle to the bottom land is called the clearance c. Backlash is the amount by which the width of a tooth

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