Abstract
Plastic gears became inevitable in many industries, numerous material pairs are available to fit any design needs. Material data bases and data sheets information is insufficient in this context, so on-site testing is necessary. Many applications use steel pinions and plastic gear, e.g., in speed reducers, where the pinion can be rather small, and they can run dry. Therefore, a combination alloy steel/POM became of interest and S-N diagrams were determined experimentally on testing rigs in company’s lab, which are presented briefly. Yet another consideration is improved gear geometry; S-gears are proposed in this paper due to their experimentally proven qualities. Some information on this gear type is provided. Lifetime tests for this material combination and both gear types are shown in a diagram. It was also shown that the process temperatures never exceed permanent temperature limit of POM. Optical observations show several developed failure mechanisms. However, to assess quantitative wear levels a 3D measuring microscope is used.
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The investment is co-financed by the Republic of Slovenia and the European Union under the European Regional Development Fund, no. SME 2/17-3/2017 and C3330-18-952014.
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Hlebanja, G., Hriberšek, M., Erjavec, M., Kulovec, S. (2021). Advanced Lifetime Tests of Plastic Gears with E- and S-Geometry. In: Barmina, N., Trubachev, E. (eds) Gears in Design, Production and Education. Mechanisms and Machine Science, vol 101. Springer, Cham. https://doi.org/10.1007/978-3-030-73022-2_21
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