Verfahren zur Berechnung der Überdeckung unter Last von Kunststoffstirnrädern

Hasl, Christian; Oster, P.; Tobie, Thomas; Stahl, Karsten

doi:10.1007/s10010-016-0207-8

Cited by 7 publications

(8 citation statements)

References 4 publications

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“…The tooth root load carrying capacity of plastic gears is highly influenced by load induced deflections during operation. 3,13 The comparably low Young's modulus of thermoplastics leads to large tooth deflections under load in comparison to steel gears. The commonly used guideline for plastic gear design VDI 2736 9 is derived from DIN 3990 14 which was developed for the calculation and design of steel gears.…”

Section: Tooth Root Breakagementioning

confidence: 99%

Damage mechanisms and tooth flank load capacity of oil‐lubricated peek gears

Illenberger

Tobie

Stahl

2022

J of Applied Polymer Sci

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Plastic gears are increasingly being utilized in higher performance ranges. Operating under oil lubrication can reduce friction and heat input. By running under oil-lubricated conditions, tooth damage such as abrasive wear recedes into a secondary role, and fatigue damage such as pitting becomes relevant for the durability of the gears. Polyether ether ketone (PEEK) is suitable for use in demanding operating conditions due to its very high strength properties, even at higher temperatures. In this work, the stress conditions affecting the tooth flank and the damage behavior of oil-lubricated PEEK gears are investigated and tooth flank strength parameters were determined for different temperature levels. Theoretical studies on the stress distribution on the tooth flank show the necessity to apply adapted profile modifications in order to reduce undesired stress conditions in the extended meshing area. In experimental investigations, the damage behavior of oil-lubricated PEEK gears is examined and the influence of temperature on the gear load capacity is discussed.

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Section: Tooth Root Breakagementioning

confidence: 99%

Damage mechanisms and tooth flank load capacity of oil‐lubricated peek gears

Illenberger

Tobie

Stahl

2022

J of Applied Polymer Sci

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“…Based on the equations acc. to (Thoma, 2011), an analyticiterative method is presented in (Hasl, 2016) to improve accuracy of the calculation of , . Furthermore, in (Hasl, 2017) it is shown, that for plastic gears the empirical factors contained in Eqn.…”

Section: State Of Knowledgementioning

confidence: 99%

“…In former works (Hasl, 2016 and2017) the number of teeth is identified as a decisive factor especially for gear materials of significantly higher elasticities compared to steel. To illustrate the influence of the number of teeth on the actual contact ratio, ∆ is calculated acc.…”

Section: Effect Of the Number Of Teeth On The Increase In Contact Ratiomentioning

confidence: 99%

“…To illustrate the influence of the number of teeth on the actual contact ratio, ∆ is calculated acc. to ACORA (Hasl, 2016) for tooth geometries of a variable number of teeth acc. to standard profile (DIN 867, 1986).…”

Section: Effect Of the Number Of Teeth On The Increase In Contact Ratiomentioning

confidence: 99%

“…As the calculation of , acc. to (Hasl, 2016) requires the implementation of the method in a computer program, due to iterations which may loop several times, a simplified estimation for standard profile tooth geometries is given by Eqn.(6). The results of the estimation acc.…”

Section: Effect Of the Number Of Teeth On The Increase In Contact Ratiomentioning

confidence: 99%

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Potential of oil-lubricated cylindrical plastic gears

Hasl

Illenberger

Oster

et al. 2018

JAMDSM

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Bending strength of injection molded polyacetal test gears is investigated in back-to-back testing using oillubrication. To validate state of the art calculation methods, tooth geometries with a variable number of teeth are investigated, maintaining a constant center distance and transmission ratio. To enable testing on a constant level of tooth temperature for variable torque loads and speeds, occurring tooth temperatures are measured and considered in latter testing. Test results show that bending strength of tooth geometries with a higher number of teeth stand higher tooth root stresses acc. to VDI 2736, as the calculated tooth root stress is too high due to negligence of load-induced deflections. A modified method for calculating tooth root stress considers loadinduced deflections, allowing to trace back the failures of the different tooth geometries to a common stress level. Therefore, a possible approach to consider the actual contact ratio for tooth root stress calculation of steelplastic spur gear pairings is proposed.

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