Methods and apparatus are provided for a torque driver including a laterally displaceable gear support member to carry an output spur gear. Two examples are presented to illustrate the method and its application.ĭisplaceable Spur Gear Torque Controlled Driver and Method The algorithm is compact and has been programmed for execution on a desk top computer. The optimization algorithm is described, and the models for gear life and performance are presented. A modified feasible directions search algorithm permits a wide variety of inequality constraints and exact design requirements to be met with low sensitivity to initial guess values. Optimization procedures allow one to design a spur gear reduction for maximum life and other end use criteria. Design examples show the influence of the bearings on the optimal configurations. After finding the continuous optimum, the designer can analyze near optimal designs for comparison and selection.
Interpolated polynomials expand the discrete bearing properties and proportions into continuous variables for optimization. A modified feasible directions search algorithm directs the optimization through a continuous design space. The overall optimization allows component properties to interact, yielding the best composite design. Designs for single mesh spur gear reductions are based on optimization of system life, system volume, and system weight including gears, support shafts, and the four bearings. The optimal design of compact spur gear reductions includes the selection of bearing and shaft proportions in addition to gear mesh parameters. Optimal design of compact spur gear reductions Peak efficiencies were found to be greater for large diameter and fine pitched gears and tare (no-load) losses were found to be significant. The effects of spur gear size, pitch, ratio, pitch line velocity and load on efficiency were determined. In general, peak efficiencies were found to be greater for larger diameter and fine pitched gears and tare (no-load) losses were found to be significant.ĭesign of Spur Gears for Improved EfficiencyĪ method to calculate spur gear system loss for a wide range of gear geometries and operating conditions was used to determine design requirements for an efficient gearset. A design example is given to illustrate how the method is to be applied. The effects of spur gear size, pitch, ratio, pitch-line-velocity and load on efficiency are shown. Design of spur gears for improved efficiencyĪ method to calculate spur gear system power loss for a wide range of gear geometries and operating conditions is used to determine design requirements for an efficient gearset.
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