3000-HP Roller Gear Transmission Development Program. Volume I. Summary Report.
UNITED TECHNOLOGIES CORP STRATFORD CONN SIKORSKY AIRCRAFT DIV
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This report presents a summary of the 3000-HP Roller Gear Transmission Development Program. During this program a helicopter transmission employing a 19.851 reduction ratio roller gear unit as the final reduction stage was designed, manufactured, and subjected to extensive testing. On the basis of the results of this program, it has been determined that the roller gear is a viable concept for use in helicopter transmissions. Among the advantages it offers are compactness and high efficiency. The roller gear unit has the potential to offer weight savings over conventional type planetaries for reduction ratios greater than 121. The roller gear unit is, however, considerably more costly than conventional planetaries. Quality control of the electron-beam welds used in the fabrication of the roller gear components remains a problem. Detailed reports on the design, manufacture, bench testing, aircraft tiedown testing, and reliability and maintainability of the roller gear transmission have been published separately. Author
- Machinery and Tools