Ein neuer, normungsfähiger Berechnungsansatz für den Wirkungsgrad von Schneckengetrieben

Oehler, Manuel; Magyar, B.; Sauer, Bernd

doi:10.1007/s10010-017-0225-1

Cited by 3 publications

(5 citation statements)

References 1 publication

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“…The influence parameters are the shear stress of the fluid Fl , the mean flank pressure Hm as well as the solid load portion . To calculate the fluid shear stress, Oehler et al [25] use a limiting shear stress flow model of Bair and Winer model according to [1].…”

Section: Load-dependent Gear Lossesmentioning

confidence: 99%

“…With regard to the worm shaft, a Nusselt correlation of a rotating cylinder according to Changenet et al [4] is used in order to determine the heat transfer coefficient˛W = N u l (24) with N u = 0.133 Re 2=3 P r 1=3 (25) with Re = l d m…”

Section: Distribution Of Load-dependent Gear Loss Between Gearsmentioning

confidence: 99%

“…Bouché [3] formulated a physics-based model for the calculation of the coefficient of friction under mixed friction for worm gears. Magyar [20] investigated the dynamics of worm gears and derived a tribological calculation model for the calculation of the coefficient of friction, which is the basis for a new standardizable approach for the calculation of worm gear efficiency [25].…”

Section: Introductionmentioning

confidence: 99%

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Efficiency and heat balance calculation of worm gears

Paschold

Sedlmair

Lohner

et al. 2020

Forsch Ingenieurwes

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Worm gears enable compact gear design and high power density due to a high gear ratio within a single gear stage. However, they often show high sliding speeds within the tooth contact, resulting in high frictional heat and increased thermal stresses. Therefore, an exact calculation regarding efficiency and heat balance is essential in the early stages of gear design. Currently, no calculation method is available to automatically analyze worm gears with regard to efficiency and heat balance. The simulation program "WTplus" is widely used to calculate the efficiency and heat balance of gearbox systems containing cylindrical and bevel gears. The efficiency is determined by adding up load-dependent and no-load power losses of gears, bearings, seals and other rotating components. The calculation of the heat balance of the gearbox is based on the heat transfer between the single components, as well as heat dissipation to the environment. A suitable abstraction of the gearbox by nodal points is conducted for an efficient and accurate calculation of local temperatures using a thermal network model. The simulation program WTplus was extended to automatically analyze the efficiency and heat balance of various designs of worm gears. For this, new approaches for the calculation of load-dependent and no-load losses, as well as new algorithms for nodalization and node-linking, were developed and implemented. Moreover, essential formulas describing the thermal resistances were customized. Simulation results were validated with measurements from research and industry showing very close alignment for various operating points and gear designs.

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Section: Load-dependent Gear Lossesmentioning

confidence: 99%

Section: Distribution Of Load-dependent Gear Loss Between Gearsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficiency and heat balance calculation of worm gears

Paschold

Sedlmair

Lohner

et al. 2020

Forsch Ingenieurwes

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“…Hence, these calculations of the flash temperature of worm gears show a sharp temperature peak in the middle of the flank, which is not plausible [20]. Accordingly, although the oil film temperature is calculated within the efficiency calculation [21], a standardized calculation method for the scuffing load capacity of worm gears is not yet included in DIN 3996 [2] or ISO/TS 14521 [1].…”

Section: Temperature Calculation Of Worm Gearsmentioning

confidence: 99%

Scuffing load capacity calculation of worm gears

Roth

Hein

Stahl

2021

Forsch Ingenieurwes

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Worm gears with wheels of harder materials, such as cast iron or steel, are often prone to the damage type scuffing, which can cause a sudden and rapid failure of the gear box. Contact temperature is a suitable criterion to determine the scuffing safety for other types of gears. However, for worm gears, a scuffing load capacity calculation is not available at the moment. This paper presents a numerical temperature simulation for worm gears that considers transient multidimensional heat transfer and local frictional loading due to the contact. Based on the results of this simulation, this paper derives a simplified calculation of worm gear contact temperatures. The calculation only contains input parameters that are already part of current standards. Its result, the contact temperature of worm gears, can be used to rate the scuffing load capacity.

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“…This numerical model is based on Archard's wear formulation and considers the influence of lubrication on the local wear coefficient, which depends on the minimum lubricant film and the amplitude of surface roughness. Oehler [16] developed a new calculation method for the prediction of the efficiency of worm-gear drives that is compatible with DIN 3996 and that could be incorporated into standard calculations. His research is based on simulations and validated by experiments, and his approach allows engineers to compare different drivetrain concepts regarding efficiency.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Influence of Contact Patterns of Worm-Gear Sets on Friction Heat Generation during Meshing

Miltenović,

Banić,

Vitković

et al. 2024

Applied Sciences

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Friction losses and scuffing failures are interesting research topics for worm gears. One of the factors leading to scuffing is the heat generated in the contact of gear teeth. The contact geometry of worm gears is complex, leading to high friction between contact surfaces. High friction between contact surfaces during operation generates heat friction that causes the occurrence of scuffing, which in turn determines the scuffing load capacity. To analyse the thermal characteristics of a worm-gear pair and the thermal behaviour of contact teeth, a direct-coupled thermal–structural 3D finite element model was applied. The heat flux due to friction-generated heat was determined on the gear tooth to investigate thermal characteristics and predict transient temperature fields. This study permits an in-depth understanding of the temperature fields and the friction heat generation process. Also, better control of the contact pattern between worm-gear teeth would decrease friction heat and increase scuffing load capacity. This paper investigates the transient thermal behaviour among different pinion machine setting parameters that can result in an optimal tooth-contact pattern that produces a lower temperature field, thus achieving higher transmission efficiency.

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Ein neuer, normungsfähiger Berechnungsansatz für den Wirkungsgrad von Schneckengetrieben

Cited by 3 publications

References 1 publication

Efficiency and heat balance calculation of worm gears

Efficiency and heat balance calculation of worm gears

Scuffing load capacity calculation of worm gears

Investigation of the Influence of Contact Patterns of Worm-Gear Sets on Friction Heat Generation during Meshing

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