Accession Number:

AD0602018

Title:

FEASIBILITY INVESTIGATION OF HARMONIC DRIVE SPEED REDUCERS FOR HELICOPTER APPLICATIONS

Descriptive Note:

Corporate Author:

KAMAN AIRCRAFT CORP BLOOMFIELD CT

Personal Author(s):

Report Date:

1964-05-01

Pagination or Media Count:

116.0

Abstract:

The report presents applicable helicopter and harmonic drive parameters, feasibility comparisons, data concerning the engineering and designing of a test unit, results of the test program, and recommendations for further research for improved efficiency. As a result of preliminary studies, parametric analysis, and actual testing of a harmonic drive unit designed for 250 horsepower at 30,000 r.p.m. input speed with 851 reduction ratio, it is concluded that 1 from the standpoints of compactness, quietness, vibration level, simplicity, reliability, and cost, harmonic drive appears to be not only feasible but superior to conventional planetary gearing, and 2 in the present state of the art, power losses associated with the hydrodynamic wave generator bearing result in significantly lower efficiency than conventional gearing.

Subject Categories:

  • Helicopters

Distribution Statement:

APPROVED FOR PUBLIC RELEASE