Volume 43, No 4, 2021, Pages 561-573

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Wear Performance of Commercial Polyoxymethylene Copolymer and Homopolymer Injection Moulded Gears


X. Xu , F. Gao , A. Lopera Valle , K. Makenji ,
C. Nedolisa , Y. Zhao , V. Goodship , K. Mao

DOI: 10.24874/ti.1039.01.21.04

Received: 7 January 2021
Revised: 1 March 2021
Accepted: 2 April 2021
Published: 15 December 2021


Polymer gears are an effective solution to lightweighting, which are highly demanded in the automotive industry. Acetal is one of the most widely used polymer gear materials. In this study, two commercial grades of acetal, homopolymer (POM-H) based and copolymer (POM-C) based, were injection moulded into gears with their wear performance compared. Noticeable differences were discovered in failure mechanism, and thermal and mechanical characteristics, which led to a difference in performance prediction. The service life of over two million cycles was expected under a torque up to 10 N m, with POM-H gears having 35% better service life than POM-C. The differences in the properties of POM-H and POM-C should be considered in future industrial applications such as the replacement for metal gears.


POM gear, Wear performance, Injection moulding, Friction

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Volume 43
Number 4
December 2021

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