Accession Number : ADA318749

Title :   Balancing Dynamic Strength of Spur Gears Operated at Extended Center Distance.

Descriptive Note : Technical memo.,

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

Personal Author(s) : Lin, Hsiang H. ; Liou, Chuen-Huei ; Townsend, Dennis P.

PDF Url : ADA318749

Report Date : SEP 1996

Pagination or Media Count : 8

Abstract : This paper presents an analytical study on using hob offset to balance the dynamic tooth strength of spur gears operated at a center distance greater than the standard value. This study is an extension of a static study by Mabie and others. The study was limited to the offset values that assure the pinion and gear teeth will neither be undercut nor become pointed. The analysis presented in this paper was performed using DANST-PC, a new version of the NASA gear dynamics code. The operating speed of the transmission influences the amount of hob offset required to equalize the dynamic stresses in the pinion and gear. The optimum hob offset for the pinion was found to vary within a small range as the speed changes. The optimum value is generally greater than the optimum value found by static procedures. For gears that must operate over a wide range of speeds, an average offset value may be used.

Descriptors :   *GEAR TEETH, *TRANSMISSIONS(MECHANICAL), OPTIMIZATION, STRESS ANALYSIS, STRENGTH(MECHANICS), DYNAMIC LOADS, TRANSMISSION GEARS, BENDING STRESS.

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE