Rf. Handschuh et al., EXPERIMENTAL TESTING OF PROTOTYPE FACE GEARS FOR HELICOPTER TRANSMISSIONS, Proceedings of the Institution of Mechanical Engineers. Part G, Journal of aerospace engineering, 208(G2), 1994, pp. 129-136
An experimental programme to test the feasibility of using face gears
in a high-speed and high-power environment was conducted. Four face ge
ar sets were tested, two sets at a time, in a closed-loop test stand a
t pinion rotational speeds to 19 100 r/min and to 271 kW (364 b.h.p.).
The test gear sets were one-half scale of the helicopter design gear
set. Testing the gears at one-eight power, the test gear set had sligh
tly increased bending and compressive stresses when compared to the fu
ll-scale design. The tests were performed in the NASA Lewis spiral bev
el gear test facility. All four sets of gears successfully ran at 100
per cent of design torque and speed for 30 million pinion cycles, and
two sets successfully ran at 200 per cent of torque for an additional
30 million pinion cycles. The results, although limited, demonstrated
the feasibility of using face gears for high-speed applications.