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research-article

Hybrid polymer gear concepts to improve thermal behaviour

[+] Author and Article Information
Carlos M. C. G. Fernandes

INEGI, Universidade do Porto, Campus FEUP, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal
cfernandes@inegi.up.pt

Diogo M. P. Rocha

FEUP, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
em12118@fe.up.pt

Ramiro C. Martins

INEGI, Universidade do Porto, Campus FEUP, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal
rcm@fe.up.pt

Luís Magalhães

ISEP, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal
llm@isep.ipp.pt

Jorge Seabra

FEUP, Universidade do Porto, Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
jseabra@fe.up.pt

1Corresponding author.

ASME doi:10.1115/1.4041461 History: Received January 17, 2018; Revised September 07, 2018

Abstract

A drawback of polymer materials is their low thermal conductivity which affects the operating temperature of polymer gears. The mechanical properties of a polymer gear are critically dependent on the maximum operating temperature. In order to improve thermal behaviour of polymer gears, a hybrid polymer gear concept is suggested which consists of a polymer gear tooth with a metallic insert to promote heat evacuation from the meshing surface. The material selection based on FEM simulations showed that an aluminium insert performed better than copper and steel for a hybrid polymer gear. The results show that an aluminium insert increases the mass by 9% in comparison with a standard polymer gear but it decreases the maximum operating temperature by 28%. Insert geometries of different complexity were studied and their influence on operating temperature assessed.

Copyright (c) 2018 by ASME
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