INVESTIGATION ABOUT THE PREVENTION OF TOOTH PROFILE CHANGE OF PLASTIC GEARS (2ND REPORT; ABRASION AND TOOTH PROFILE CHANGE OF NYLON GEAR, REINFORCED WITH A STIFFENER).

When the tooth of a nylon gear of visco-elastic body was applied with a force the tooth deflected largely and a rotational lag occurred at the mating steel gear. This caused an abnormal abrasion at nylon gear tooth flanks and the tooth profile changed conspicuously. In order to prevent these things, the nylon gear was developed. The gear included a stiffener of steel in the core of tooth and the tooth was made hard to deflect. In this report, the manufacture of this gear was outlined and the characteristic of abrasion and the tooth profile change in the course of operation were made clear.