Potential of oil-lubricated cylindrical plastic gears

Hasl, Christian; Illenberger, C. M.; Oster, P.; Tobie, Thomas; Stahl, Karsten

doi:10.1299/jamdsm.2018jamdsm0016

Cited by 48 publications

(26 citation statements)

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“…Highly-stressed machine elements making of thermoplastics are often lubricated to dissipate frictional losses, while at the same time reducing friction and wear. As a result of this, a significant increase in the transmittable power can be achieved, as exemplarily shown by Hasl et al [3] and Illenberger et al [4] for polymer gears.…”

Section: Introductionmentioning

confidence: 71%

Friction and Temperature Behavior of Lubricated Thermoplastic Polymer Contacts

et al. 2020

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This work focuses on the friction and temperature behavior of thermo-elastohydrodynamically lubricated (TEHL) contacts under rolling-sliding conditions. For this purpose, a twin-disk test rig is used with a hybrid setup of plain and fiber-reinforced polyamide (PA) 66 and polyetheretherketone (PEEK) disks paired with case-hardened steel disks and three different lubricants. Experimental investigations include various lubrication regimes by varying sum velocity and oil temperature as well as load and slip ratio. The measured friction in thermoplastic TEHL contacts is particularly very low in the area of high fluid load portion, which refers to the large deformation of the compliant polymer surface. Newtonian flow behavior mainly determines fluid friction. The low thermal effusivity of polymers insulates the contact and can further reduce the effective lubricant viscosity, and thus the fluid friction. For low sum velocities, solid friction influences the tribological behavior depending on the solid load portion. Although the interfacial contact friction is comparably small, material damping strongly contributes to power losses and increases bulk temperature, which in turn affects the TEHL contact. Thus, loading frequency and the resulting bulk temperature are identified as one of the main drivers of power losses and tribological behavior of lubricated thermoplastic polymer contacts.

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Section: Introductionmentioning

confidence: 71%

Friction and Temperature Behavior of Lubricated Thermoplastic Polymer Contacts

et al. 2020

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“…Abrasive wear of the tooth flanks leads to a continuous reduction of the tooth crosssection and thus limits the lifetime. Due to the reduction in wear, fatigue damages such as tooth root breakage and pitting are increasingly emerging in oil-lubricated operation and extended running times [10,11]. For the calculation of the tooth root load capacity and the tooth flank load capacity, VDI 2736 [2] provides calculation approaches that are strongly based on the principles according to DIN 3990 [12] for metallic gears.…”

mentioning

confidence: 99%

Operating behavior and performance of oil-lubricated plastic gears

Illenberger

Tobie

Stahl

2021

Forsch Ingenieurwes

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Plastic gears and their numerous applications have become an integral part of industrial practice. In particular, the ability to produce large numbers of gears cost-effectively using injection molding techniques is making a significant contribution to growing market shares. Compared to conventional steel materials, however, the material properties of thermoplastics differ fundamentally. In particular, the high temperature dependence of the material properties and the lower strength pose challenges for designers. Against this background, theoretical and experimental studies on the operating and service life behavior of different thermoplastic materials have been conducted and evaluated. In addition to theoretical investigations on the tooth flank load carrying capacity, comprehensive measurements on temperature behavior were carried out and compared to common methods of temperature calculation for plastic gears. Experimental investigations on the tooth flank load capacity by means of back-to-back tests of different materials and their evaluation show the potential of thermoplastic materials for the application in power transmitting drivetrains. This contribution will give an overview of the performed research work and summarizes main results of these studies.

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“…25,27 Estimation of bending stress without considering the effect of deflection-induced load sharing can result in unrealistically high bending stress values. Experimental results of Hasl et al 16 revealed that the load-carrying capacity of POM gears was significantly higher than the predicted values, as the effect of the increased contact ratio was disregarded by the VDI 2736 method. In asymmetric polymer gears, deflection-induced load sharing improves the bending fatigue life when the drive side pressure angle is lower than the coast side.…”

Section: Bending Stress and Load Sharing In Polymer Gearsmentioning

confidence: 93%

“…Nonetheless, the evaluation of bending fatigue strength is essential since tooth breakage due to bending fatigue occurs in polymer gears. [14][15][16] The polymer gear design must incorporate an asymmetric tooth form, optimized fillet profile, and transitional contact ratio to achieve a robust bending fatigue strength. 1 An asymmetric gear tooth consists of different pressure angles on either side of the tooth.…”

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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Potential of oil-lubricated cylindrical plastic gears

Cited by 48 publications

References 1 publication

Friction and Temperature Behavior of Lubricated Thermoplastic Polymer Contacts

Friction and Temperature Behavior of Lubricated Thermoplastic Polymer Contacts

Operating behavior and performance of oil-lubricated plastic gears

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

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