Tooth Surface Temperature and Power Transmission Efficiency of Plastic Sine-Curve Gear

Koide, Takao; Yukawa, Tatsuya; Takami, Suguru; Ueda, Akio; Tamura, Atsutaka; Hongu, Junichi

doi:10.1299/jsmeimpt.2017.09-03

Cited by 5 publications

(7 citation statements)

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“…Thus, there is no significant temperature rise compared to other types of POM gear pairs during the low power meshing process. The meshing efficiency of POM involute gear pair is around 93% when rpm 1 300 n  and N mm 2 1,000 T   [33], that of POM sine-curve gear pair is around 94% when  1 n rpm 300 and N mm 2 1,000 T   [33], but that of POM PLGP is higher than 99% when rpm This paper focuses on the meshing efficiency of POM PLGP under normal use which mainly correlates to load, rotational speed, and misalignment. It should be noted that significant wear and deformation may occur on the tooth surfaces under a long-term operation that increases the relative sliding between the meshing surfaces, leading to frictional losses and temperature rise.…”

Section: Discussionmentioning

confidence: 99%

A calculation method for friction coefficient and meshing efficiency of plastic line gear pair under dry friction conditions

Chen

Lin

2020

Friction

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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.

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Section: Discussionmentioning

confidence: 99%

A calculation method for friction coefficient and meshing efficiency of plastic line gear pair under dry friction conditions

Chen

Lin

2020

Friction

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“…The surface temperature of polymer-polymer pairs was higher than steel-polymer pairs for PA 66 11 and POM. 13 On the other hand, for PEEK, the surface temperature was higher for steel-polymer pairs. 11 Regarding the life, for POM and ABS, steel-polymer pairs exhibited higher life, 9 whereas polymer-polymer pairs exhibited higher life in the case of PEEK.…”

Section: Introductionmentioning

confidence: 99%

“…In another investigation by Dearn et al, 12 the lubrication regimes of steel-polymer and polymer-polymer pairs of PEEK gears were determined based on oil film thickness and efficiency. Koide et al 13 evaluated the transmission efficiency and surface temperature of steel-polymer and polymer-polymer combinations of sine and involute POM gears.…”

Section: Introductionmentioning

confidence: 99%

Effect of metal and polymer mating gears on the bending fatigue performance of asymmetric polymer gears

Pandian

Gautam

Senthilvelan

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The material of the mating gear influences the fatigue life of polymer gears. The bending fatigue characteristics of polyamide 66 asymmetric gears (34°/20° and 20°/34°) corresponding to steel–polymer and polymer–polymer material combinations were investigated. The performance of symmetric gear pairs (20°/20°) was determined to serve as a comparison. Quasi-static numerical simulations were performed in a finite element analysis tool to predict root bending stress, load sharing ratio, and tooth deflection. The bending fatigue strength of steel–polymer and polymer–polymer pairs of each test configuration was determined using bending fatigue tests. The load sharing ratio and root bending stress of polymer–polymer pairs decreased substantially compared to steel–polymer pairs. The extent of deflection-induced load sharing was greater in polymer–polymer pairs. The bending fatigue life of polymer–polymer pairs was lower than that of steel–polymer pairs owing to the higher operating temperature. In polymer–polymer pairs, polymer driving and driven gears increased the heat generated and diminished the heat dissipation to the environment. In steel–polymer and polymer–polymer pairs, the configuration with the highest bending fatigue strength was 34°/20° and 20°/34°, respectively. This divergence was caused by the increase in temperature difference between the two configurations for polymer–polymer pairs. Analysis of hysteresis loops indicated that the loop area was higher for polymer–polymer pairs, signifying the increased amount of dissipated energy. No noticeable variation was observed between the failure modes of steel–polymer and polymer–polymer pairs despite the significant difference in the operating temperatures. The bending stress and operating temperature were the dominant factors affecting the performance of steel–polymer and polymer–polymer gear pairs, respectively.

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“…Although involute gears have been widely used, the researches on non-involute gears have never stopped, such as cycloidal gears, sine (cosine) gears, circular arc gears, and so on. Koide et al 1 tested the tooth surface temperature and the power transmission efficiency of plastic sine-curve gears in the running condition. Test results showed that the sine-curve gears for the operating condition had lower tooth surface temperatures and higher power transmission efficiencies than involute gears.…”

Section: Introductionmentioning

confidence: 99%

Research on S-gear design, manufacturing and measuring based on NC machining center

Ren

Wang

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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This article presents a method of design, manufacturing, and measuring S-gear. S-gear is a kind of gear whose tooth profile is an S-shaped curve. The sine (cosine) gear, cycloid gear, polynomial gear, and circular arc gear are all S-gears in essence. In the S-gear transmission, the concave surface of one gear and the convex surface of the other gear contact each other. Therefore, the power transmitted by S-gear is much larger than that of the convex-convex-contact involute gear. Some scholars have studied the characteristics of S-gear, but few have explored its manufacturing. In this article, the Numerical Control (NC) machining technology of S-gear is studied in detail for its industrial application. The polynomial curve is used to construct the tooth profile of the S-gear based on the Gear Meshing Theory. The mathematical model of polynomial S-gear is established, by which involute gear can be represented as a special S-gear. The steps of generating NC codes are described. Then, the S-gear sample is processed with an NC machining center. Finally, the sample is measured with a Coordinate Measuring Machine (CMM), and the measurement results show that the accuracy of the S-gear processed by the NC machining center reaches ISO6. This research provides a feasible approach for the design, manufacturing, and measuring of S-gear.

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Tooth Surface Temperature and Power Transmission Efficiency of Plastic Sine-Curve Gear

Cited by 5 publications

References 0 publications

A calculation method for friction coefficient and meshing efficiency of plastic line gear pair under dry friction conditions

A calculation method for friction coefficient and meshing efficiency of plastic line gear pair under dry friction conditions

Effect of metal and polymer mating gears on the bending fatigue performance of asymmetric polymer gears

Research on S-gear design, manufacturing and measuring based on NC machining center

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