Noise and Transmission Efficiency under Deformation of Tooth Form of Nylon Gear

Tsukamoto, Naohisa; Yano, Tōru

doi:10.1299/jsme1958.25.1465

Cited by 10 publications

(4 citation statements)

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“…When the rotational speed of test gear is increased, the rate of loading on each gear tooth during service also increases [29]. Rotational speed of the gear can be correlated with the loading rate of single tooth considering the load sharing.…”

Section: Gear Tooth Rate Of Loadingmentioning

confidence: 99%

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Effect of rotational speed on the performance of unreinforced and glass fiber reinforced Nylon 6 spur gears

Senthilvelan

Gnanamoorthy

2007

Materials & Design

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Section: Gear Tooth Rate Of Loadingmentioning

confidence: 99%

“…Rotational speed of the gear can be correlated with the loading rate of single tooth considering the load sharing. The rate of loading or the strain rate of a gear tooth is expressed as [29,30].…”

Section: Gear Tooth Rate Of Loadingmentioning

confidence: 99%

Effect of rotational speed on the performance of unreinforced and glass fiber reinforced Nylon 6 spur gears

Senthilvelan

Gnanamoorthy

2007

Materials & Design

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“…Hoskins et al [7] investigated the acoustic noise from polymer gears and found that the sound power level of POM is inversely proportional to speed, but proportional to load, whereas in the other materials tested, is proportional to both speed and load. Noise and transmission efficiency under deformation of tooth form of nylon gear is investigated by Tsukamoto et al [8]. It was observed that the noise of nylon gears is lower than the noise of steel gears because the sound pressure level is low when the frequency band is about 1.3 kHz and over.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Acoustic Emission From Functionally Graded Materials Based Polymer Gear

2016

Arimpie-2016

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Polymer gears have positioned themselves as serious alternatives to traditional metal gears in a wide variety of applications. They have less weight, lower inertia and run much quieter than their metal counterparts. This paper investigates the leverage of fabrication techniques of polymer gear in the noise generation during operation. Polymer gears are fabricated by two different techniques i.e. conventional technique and horizontal centrifugal casting technique. Homogeneous gear is fabricated by conventional technique whereas horizontal centrifugal casting technique is used to fabricate functionally graded materials (FGMs) based thermoplastic spur gear. Polyamide materials filled with 15 wt% and 30 wt% glass fibers are used to fabricate homogeneous, and FGM gears. Unfilled Polyamide gear is also fabricated for comparative study. Gears are run at various speed and torque combinations. The range of the speed and torque is 500-1400 rpm and 0.8-2.6 Nm, respectively. Sound power levels are recorded and analyzed for various running combinations of fabricated gears.

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“…Tsukamoto et al (1981Tsukamoto et al ( , 1991 investigated about the strength of plastic gears and proposed strength design methods for plastic gears. Tsukamoto et al (1982) have also investigated the effect of tooth profile deformation on the noise and transmission efficiency of nylon gears. Terashima et al (1984) proposed measures for increasing the load carrying capacity of polymer gears.…”

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confidence: 99%

Different teeth profile shapes of polymer gears and comparison of their performance

Zorko

Kulovec²,

Tavčar

et al. 2017

JAMDSM

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This article presents a lifespan testing analysis of polymer gears manufactured by cutting. Compared to injection molding, machine cutting provides higher accuracy of gear geometry. Two different tooth flank geometries were tested; i.e. involute and S-gears. In theory, S-gears have several advantages over involute gears due to the convex/concave contact between the matching flanks. The theoretical tooth flank geometry of S-gears provides more rolling and less sliding between the matching flanks, compared to involute gears. The convex/concave contact leads to lower contact stress, which in combination with less sliding means lower losses due to sliding friction and consequently less heat generated. The goal of our research was to prove that tooth flank geometry affects the lifetime of polymer gears, and to find the mechanisms and quantitative differences in the performance of both analyzed geometries. The gears were tested on specially designed testing equipment, which allows exact adjustment of the central axis distance. Two different material pairs (POM/POM and POM/PA66) of the drive and driven gears were tested. Each test was done at a constant moment load and a constant rotational speed. Several tests were conducted using the same conditions due to repeatability analysis. All the tests were performed till the failure of the gear pair and without lubrication. In lifespan testing, the polymer S-gears showed better performance and longer lifespan than involute polymer gears.Keywords : Polymer gears, Lifespan testing, Temperature, S-gears, Involute IntroductionThe involute shape of the tooth flank was suggested by Leonard Euler (1775). Due to its unique properties, the involute shape of the tooth flank prevailed and most of the gears nowadays are involute. The condition that a tooth flank shape should fulfil in order to provide a constant gear ratio is defined by the law of gearing. Many curves, not just the involute one, fulfil it, which has yielded many other tooth flank shapes that are rarely used in practice. The purpose of developing new gear shapes is to improve the disadvantages of involute gears, such as: the convex/convex contact, teeth undercutting, and gears with a small number of teeth have a shorter dedendum, which leads to increased sliding and losses due to friction. Besides involute gearing, cycloidal gearing is the next best known type, mainly used in wrist watch mechanisms. Kapelevich (2013) dedicated much of his research work to gears with asymmetric tooth flanks, where the active tooth flank is still of involute shape. Mohan and Senthilvelan (2014) studied the lifespan of asymmetric composite gears. Kim (2006) and Düzcükoglu (2009) also worked on improving the performance of polymer gears. They used the involute tooth profile and attempted to extend the lifespan of gears by virtue of geometric changes in teeth width. Koide et al. (2017) investigated the impact of the sine-curve gear on the tooth surface temperature and gear power transmission efficiency. Hlebanja et al. (2008) suggeste...

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Noise and Transmission Efficiency under Deformation of Tooth Form of Nylon Gear

Cited by 10 publications

References 0 publications

Effect of rotational speed on the performance of unreinforced and glass fiber reinforced Nylon 6 spur gears

Effect of rotational speed on the performance of unreinforced and glass fiber reinforced Nylon 6 spur gears

Experimental Investigation on Acoustic Emission From Functionally Graded Materials Based Polymer Gear

Different teeth profile shapes of polymer gears and comparison of their performance

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