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US 5,315,790 AGranted
Gear tooth topological modification
AssigneeUnited Technologies Corporation
InventorsJules G. Kish, Charles Isabelle
Life of this patent
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AssigneeUnited Technologies Corporation
InventorsJules G. Kish, Charles Isabelle
Estimating the term…
The topology of parallel axis gears, such as spur and helical gears is modified to produce quieter and more smoothly operating gear sets with more uniform load distribution. A finite element analysis of the gear in its operating mode is made to produce a plot of radial and tangential deflections of the pinion and gear tooth surfaces which will occur when the gears are loaded during operation. The resultant plot is then inverted to produce a plot, or set of coordinates, which will define the path of travel of the gear tooth grinding wheel, which path is a mirror image of the plot of the finite element analysis. The resulting gears, when subjected to operating loads, will thus be deflected tangentially and radially to their optimum operating, or theoretical true involute, positions so as to produce quieter, smoother, and more evenly loaded gear trains.
A parallel axis gear having a modified tooth topology which is derived from a finite element analysis of a gear train which includes said gear, which analysis is made at a predetermined gear train operating load to calculate tangential and radial load-induced gear tooth deflections, said gear having a ground tooth topology which mirrors said calculated tangential and radial tooth deflections so that said gear teeth will assume a substantially true involute configuration when subjected to said predetermined operating load.
A method for forming a topologically modified parallel axis gear, said method comprising the steps of:
Dependencies are inferred from the claim text.