A calculation method for friction coefficient and meshing efficiency of plastic line gear pair under dry friction condit
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ISSN 2223-7690 CN 10-1237/TH
RESEARCH ARTICLE
A calculation method for friction coefficient and meshing efficiency of plastic line gear pair under dry friction conditions Yangzhi CHEN*, Yifan LIN School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China Received: 12 December 2019 / Revised: 13 May 2020 / Accepted: 28 June 2020
© The author(s) 2020. Abstract: A calculation method for the friction coefficient and meshing efficiency of plastic line gear (LG) pair under dry friction conditions was studied theoretically and experimentally, taking a polyoxymethylene parallel line gear pair (POM PLGP) as an example. Firstly, the geometric and mechanical models of PLGP were built by considering the effects of misalignment and loaded deformation under the actual operating condition. Then, the friction coefficient of POM specimens was obtained via the ball-on-disk experiment, of which the value varies between 0.35 and 0.45 under the experimental conditions. The calculation formula for the friction coefficient of POM LG pair was obtained by fitting the friction coefficient of the POM specimens, and the meshing efficiency of POM LG pair was calculated based on the calculation formula for friction coefficient and the meshing efficiency calculation approach. Finally, the meshing efficiency of POM PLGP specimens was measured using a homemade gear meshing efficiency test rig. The experimental results validated the feasibility of the proposed calculation method for the friction coefficient and meshing efficiency of the plastic LG pair. This study provides a method for the calculation of the friction coefficient and meshing efficiency of plastic gear pairs under dry friction conditions. It also provides the basis for the wear calculation of plastic LG pair under dry friction conditions. Keywords: line gear (LG) pair; friction coefficient; meshing efficiency; dry friction; polyoxymethylene (POM)
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Introduction
The advantages of plastic gears, such as lightweight, low noise, self-lubrication, and low cost, have led to their wide use in gearing systems applied under conditions of dry friction, low rotational speed, and light load, such as measuring instruments, food machinery, and mobile communication equipment [1–4]. The remote control unit (RCU) is the core equipment of a base station antenna, which can realize the tilt angle adjustment through a gear transmission system. Polyoxymethylene (POM) is free from electromagnetic interference and has the advantages of low hygroscopicity, high strength,
and good wear resistance [5–7]. Thus, POM gear pairs are commonly used in RCU. However, relative sliding between meshing surfaces occurs throughout the meshing process (except for the pitch point) of commonly used POM gear pairs, such as spur gear, helical gear, and worm gear pairs, which results in low meshing efficiency and restricts the application of POM gear pairs under dry friction conditions [3, 8, 9]. Line gear (LG), a novel gear mechanism invented based on the space curve me
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