Accession Number : ADA119177

Title :   The Optimal Design of Involute Gear Teeth with Unequal Addenda.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CENTER

Personal Author(s) : Savage,Michael ; Coy,John J ; Townsend,Dennis P

PDF Url : ADA119177

Report Date : Jan 1982

Pagination or Media Count : 9

Abstract : The design of a gear mesh is treated with the objective of minimizing the gear size for a given gear ratio, pinion torque, pressure angle, and allowable tooth strengths. The gear tooth strengths considered are scoring, pitting fatigue, and bending fatigue. Kinematic involute interference is also avoided. The design variation on standard spur gear teeth called the long and short addendum system is considered. In this system, the mesh center distance and pressure angle are mainained as is the ability to manufacture the teeth with standard tooling. However, the pinion and gear tooth proportions are altered in order to obtain fewer teeth numbers for the same ratio as standard gears without kinematic involute interference. The effect of this nonstandard gearing geometry on tooth strengths and gear mesh size are studied. For a 2:1 gearing ratio, the optimal nonstandard gear design is compared with the optimal standard gear design. (Author)

Descriptors :   *Gears, *Gear teeth, *Experimental design, *Sizes(Dimensions), Strength(Mechanics), Fatigue(Mechanics), Bending, Optimization, Physical properties, Structural properties, Kinematics, Pitting, Machine tool industry

Subject Categories : Machinery and Tools
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE