Accession Number : ADA294273

Title :   Thermal Behavior of Spiral Bevel Gears.

Descriptive Note : Technical memo.,

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

Personal Author(s) : Handschuh, Robert F.

PDF Url : ADA294273

Report Date : JAN 1995

Pagination or Media Count : 190

Abstract : An experimental and analytical study of the thermal behavior of spiral bevel gears is presented. Experimental data were taken using thermocoupled test hardware and an infrared microscope. Many operational parameters were varied to investigate their effects on the thermal behavior. The data taken were also used to validate the boundary conditions applied to the analytical model A finite element based solution sequence was developed. The three-dimensional model was developed based on the manufacturing process for these gears. Contact between the meshing gears was found using tooth contact analysis to describe the location, curvatures, orientations, and surface velocities. This information was then used in a three-dimensional Hertzian contact analysis to predict contact ellipse size anti maximum pressure. From these results, an estimate of the heat flux magnitude and the location on the finite element model was made. The finite element model used time-averaged boundary conditions to permit the solution to attain steady state in a computationally efficient manner. Then tune- and position-varying boundary conditions were applied to the model to analyze the cyclic heating and cooling due to the gears meshing and transferring heat to the surroundings, respectively. The model was run in this mode until the temperature behavior stabilized. The transient flash temperature on the surface was therefore described. The analysis can be used to predict the overall expected thermal behavior of spiral bevel gears. The experimental and analytical results were compared for this study and also with a limited number of other studies.

Descriptors :   *HEAT TRANSFER, *GEARS, VELOCITY, COMPUTER PROGRAM DOCUMENTATION, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, STEADY STATE, TRANSIENTS, EXPERIMENTAL DATA, MANUFACTURING, FATIGUE LIFE, TIME DEPENDENCE, PARAMETERS, FINITE ELEMENT ANALYSIS, LOADS(FORCES), COMPARISON, THERMAL STABILITY, COOLING, BOUNDARIES, THREE DIMENSIONAL, FINITE DIFFERENCE THEORY, THERMAL ANALYSIS, THERMAL FATIGUE, SUBROUTINES, MICROSCOPES, HEAT FLUX, SURFACE TEMPERATURE, THERMOCOUPLES, THERMAL CYCLING TESTS, THERMAL STRESSES, LUBRICATION, ANTIFRICTION BEARINGS, GEAR TEETH.

Subject Categories : Machinery and Tools
      Thermodynamics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE