Patent ID: 7155793
Filing Date: 2007-01-02
Classification: F16H,Y10T

Abstract:
1. A method for producing a Ravigneaux gearset having gearset parameters that permit assembly of a gearset including mutually identical short pinions, spaced at equal radial distance from and equal angular intervals about an axis, meshing with a sun gear, mutually identical long pinions each meshing with two adjacent short pinions, a long sun gear and ring gear, the method comprising the steps of: determining a number of gear teeth for each gear and pinion that would in combination produce desired gear ratios; determining current gearset parameters including distances and angles relating the positions of the gears and pinions; determining, for a predetermined angular rotation of a selected gear or pinion, an error representing a difference in phases of a tooth on the selected gear or pinion into its mesh cycle, a first phase being determined along a first portion of a drive path of meshing gears and pinions, a second phase determined along a second portion of the drive path distinct from the first portion; repetitively changing one or more of the current gearset parameters to determine a set of optimal gearset parameters for which the error is in the range between zero and a magnitude of single pair backlash of the gearset; and producing a gearset having the optimal gearset parameters.