Characterization of TEHL contacts of thermoplastic gears

Maier, Enzo; Ziegltrum, A.; Lohner, Thomas; Stahl, Karsten

doi:10.1007/s10010-017-0230-4

Cited by 16 publications

(14 citation statements)

References 15 publications

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“…Compared with the hybrid contact with polymer-steel disk setup, even higher contact temperatures with simultaneously lower bulk temperatures are possible for the polymer-polymer contact. This falls in line with the simulation results by Maier et al [6]. Figure 10 shows for the hybrid polymer-steel disk setup the influence of glass fiber reinforcement on the friction and temperature behavior of PEEK and PA66 with F N = 1000 N, FVA3, and ϑ M = 60 • C. For conditions with a high fluid load portion at v = 16 m/s in Figure 10a, PEEK+GF30 shows no significant difference in the friction behavior compared with plain PEEK.…”

Section: Influence Of the Disk Setupsupporting

confidence: 93%

“…For conditions with high fluid load portion at = 16 / , very low coefficients of friction are measured because of the significant compliance of the surface, which keeps the effective viscosity, and thus the interfacial friction, low. The friction curve runs approximately linear, which indicates Newtonian lubricant rheology and confirms preliminary studies [6] (see Section 1). By decreasing the sum velocity to = As illustrated in Figure 3, all materials show an increase in bulk temperature ϑ M with increasing load at all sum velocities.…”

Section: Influence Of the Matrix Materialssupporting

confidence: 87%

“…with simultaneously lower bulk temperatures are possible for the polymer-polymer contact. This falls in line with the simulation results by Maier et al[6].…”

supporting

confidence: 93%

“…Soft TEHL contacts are generally defined by deformations of the rolling-sliding elements greater than the thickness of the lubricant film [5]. A detailed characterization of the soft TEHL contact is given by Maier et al [6]. The behavior of the lubricant is described as both, nearly isoviscous and Newtonian (e.g., [6,7]).…”

Section: Introductionmentioning

confidence: 99%

“…A detailed characterization of the soft TEHL contact is given by Maier et al [6]. The behavior of the lubricant is described as both, nearly isoviscous and Newtonian (e.g., [6,7]). In TEHL contacts with thermoplastic elements, the large surface deformation owing to low polymer stiffness causes a significant decrease in hydrodynamic contact pressure and an increase in the lubricant film thickness.…”

Section: Introductionmentioning

confidence: 99%

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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: Influence Of the Disk Setupsupporting

confidence: 93%

Section: Influence Of the Matrix Materialssupporting

confidence: 87%

“…with simultaneously lower bulk temperatures are possible for the polymer-polymer contact. This falls in line with the simulation results by Maier et al[6].…”

supporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Friction and Temperature Behavior of Lubricated Thermoplastic Polymer Contacts

et al. 2020

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High-Performance Plastic Gears

Illenberger

Tobie

Stahl

2021

Recent Advances in Gearing

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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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Characterization of TEHL contacts of thermoplastic gears

Cited by 16 publications

References 15 publications

Friction and Temperature Behavior of Lubricated Thermoplastic Polymer Contacts

Friction and Temperature Behavior of Lubricated Thermoplastic Polymer Contacts

High-Performance Plastic Gears

Operating behavior and performance of oil-lubricated plastic gears

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