Comparative Fatigue Resistance of Fiber Reinforced Nylon 6 Gears

[+] Author and Article Information
G. Crippa

Sniatecnopolimeri SpA, Plastics Design Dpt., NYLTECH Italia Ceriano Laghetto, Milano, Italy

P. Davoli

Dipartimento di Meccanica, Politecnico di Milano Milano, Italy

J. Mech. Des 117(1), 193-198 (Mar 01, 1995) (6 pages) doi:10.1115/1.2826106 History: Received December 01, 1991; Revised February 01, 1993; Online January 25, 2008


The fatigue-life diagrams of injection-molded nylon 6 gears with different reinforcements are shown for various lubrication modes (dry, grease, splash oil lubrication) and for different meshing combinations (plastic/plastic and steel/plastic gears). Tests using a suitably designed back-to-back rig have been carried out, and the results compared with previous experiments, performed using unreinforced nylon 6 gears. 232 gears (70 in unreinforced and 162 in differently filled nylon) were tested. More than 700 · 106 cycles have been totalled. From test data, and from the “matrix” of the gear/pinion material combination, the capabilities of differently reinforced nylon 6 gears in terms of fatigue and wear resistance have been outlined. These capabilities are the basis for a proper material selection in plastic gear design.

Copyright © 1995 by The American Society of Mechanical Engineers
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