Affiliations: Medium Steam Turbine, Generator and Gear Department, General Electric Company, River Works, Lynn, Mass
Note: [1] When this paper was written the authors included information and expressed Opinions they believed to be correct and reliable. However, because of the constant advance of technical knowledge, the widely differing conditions of possible specific applications, and the possibility of misapplication, neither the authors nor their employer make any warranty with respect to, or assume any liability arising out of this paper, its contents, or its use.
Note: [2] For presentation at the Annual Meeting, New York, N.Y., November 12–13, 1959, of The Society of Naval Architects and Marine Engineers.
Abstract: Serious tooth misalignment can occur in the second reduction mesh of a typical ship’s main propulsion gear due to a crossed-axes condition between mating pinions and gear in operation when the gear has more static loading on one of its bearings than on the other. A maximum difference between static fore and aft gear bearing loadings is recommended and illustrated by presenting a few actual line-shaft arrangements. Variation of static bearing loadings with bearing position is shown by use of influence numbers. Alignment data and considerations that must be available to produce a good co-ordinated gear to lineshaft arrangement is reviewed. The alignment of steam turbines to main propulsion gears to compensate for thermal expansions and journal-reaction position is also described.
