Title page for ETD etd-05102004-214649

Type of Document Master's Thesis
Author Wolff, Andrew Vincent
Author's Email Address wolffan@vt.edu
URN etd-05102004-214649
Title Analysis of a Split-Path Gear Train with Fluid-Film Bearings
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Kirk, R. Gordon Committee Chair
Inman, Daniel J. Committee Member
Reinholtz, Charles F. Committee Member
  • split path
  • gearbox
  • split torque
  • helical
Date of Defense 2004-05-06
Availability unrestricted
In the current literature, split path gear trains are analyzed for use in helicopter transmissions and marine gearboxes. The goal in these systems is to equalize the torque in each path as much as possible. There are other gear trains where the operator intends to hold the torque split unevenly. This allows for control over the gearbox bearing loading which in turn has a direct effect on bearing stiffness and damping characteristics. Having control over these characteristics is a benefit to a designer or operator concerned with suppressing machine vibration.

This thesis presents an analytical method for analyzing the torque in split path gear trains. A computer program was developed that computes the bearing loads in various gearbox arrangements using the torque information gathered by the analytical method. A case study is presented that demonstrates the significance of the analytical method in troubleshooting an industrial gearbox that has excessive vibration.

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