Efficiency of Worm Gear Drives Under Transient Operating Conditions

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

doi:10.1115/1.4044655

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…Together with the losses of the bearings and seals as well as the hydraulic losses in the gearbox, the overall efficiency of worm gearboxes can thus be calculated. The workflow of the tribological simulation is described more detailed in [14].…”

Section: Tribological Simulation Of Worm Gearsmentioning

confidence: 99%

Wear simulation of worm gears based on an energetic approach

Daubach

Oehler

Sauer

2021

Forsch Ingenieurwes

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Wear phenomena in worm gears are dependent on the size of the gears. Whereas larger gears are mainly affected by fatigue wear, abrasive wear is predominant in smaller gears. In this context a simulation model for abrasive wear of worm gears was developed, which is based on an energetic wear equation. This approach associates wear with solid friction energy occurring in the tooth contact. The physically-based wear simulation model includes a tooth contact analysis and tribological calculation to determine the local solid tooth friction and wear. The calculation is iterated with the modified tooth flank geometry of the worn worm wheel, in order to consider the influence of wear on the tooth contact. Experimental results on worm gears are used to determine the wear model parameter and to validate the model. A simulative study for a wide range of worm gear geometries was conducted to investigate the influence of geometry and operating conditions on abrasive wear.

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Section: Tribological Simulation Of Worm Gearsmentioning

confidence: 99%

Wear simulation of worm gears based on an energetic approach

Daubach

Oehler

Sauer

2021

Forsch Ingenieurwes

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“…Furthermore, ZC1 worm gear has better properties in terms of contact stress. 28 In addition, the efficiency of worm gearboxes and worm drives is investigated, 29,30 and the schematic diagrams of the theoretical contact lines in the cross section of the worm are provided. 30 In this study, the meshing theory for gear drives and the EHL theory are comprehensively applied, and the locus of lubricating weak point is computed for the toroidal surface enveloping cylindrical worm drive in terms of the lubrication angle.…”

Section: Introductionmentioning

confidence: 99%

“…28 In addition, the efficiency of worm gearboxes and worm drives is investigated, 29,30 and the schematic diagrams of the theoretical contact lines in the cross section of the worm are provided. 30 In this study, the meshing theory for gear drives and the EHL theory are comprehensively applied, and the locus of lubricating weak point is computed for the toroidal surface enveloping cylindrical worm drive in terms of the lubrication angle. The lubrication regular of this cylindrical worm drive is deeply revealed, and some phenomena with respect to its lubrication can be well expounded in the light of the theory suggested.…”

Section: Introductionmentioning

confidence: 99%

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Locus of lubricating weak point for the toroidal surface enveloping cylindrical worm drive

Cui

Zhao

et al. 2022

Lubrication Science

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Based on the lubrication angle field and the locus of lubricating weak point, the lubricating characteristic of the toroidal surface enveloping cylindrical worm drive is globally investigated. The nonlinear equation system to determine the lubricating weak point is established by utilising the lubrication angle. Generally speaking, the weak locus always exists roughly in the middle of the tooth surface of cylindrical wormgear and a zone with worse lubricating behaviour is around the locus. By increasing the number of worm thread, the locus of lubricating weak point can be completely removed from the wormgear tooth surface, and the locus approximately is in the shape of the inverse capital letter L. On this occasion, the entire wormgear tooth surface is half surrounded by the locus, and the overall lubrication performance of the worm drive is improved. The current research is an application of elastohydrodynamic lubrication (EHL) on worm drive.

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“…Paschold [6] proposed a calculation method of load-dependent and no-load losses, the efficiency of worm gears was analyzed. Oehler [7] analyzed the relationship among conditions, power dissipation and temperature. On the basis, the efficiency and temperature of gearbox can be estimated for arbitrary load.…”

Section: Introductionmentioning

confidence: 99%

Influence of rotational speed and torque on meshing efficiency of double helical gear transmission system

Cheng

2021

Mechanics & Industry

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The accuracy of gear meshing efficiency model is the key to study the influence factors of gear meshing efficiency. Experiment is an effective method to verify the theory model. Therefore, the acquisition of experimental value of gear meshing efficiency is particularly important. Taken double helical gears as the research object, on the analysis of a large number of experimental data, the experimental value of gear meshing efficiency for double helical gears are calculated and then the influence of rotational speed and torque on meshing efficiency of double helical gears is studied. Firstly, the calculation method of transmission efficiency for experimental value in different layout of gear test-rigs with closed power flow is summarized. Secondly, the calculation method of meshing efficiency for experimental value in gear test-rig with closed power flow is introduced. Thirdly, the calculation method of load-dependent bearing loss is given. Finally, the experimental value of meshing efficiency for double helical gears is calculated and the influence of rotational speed and torque on meshing efficiency of double helical gears is obtained, which lays a theoretical foundation for the further improvement of the transmission efficiency of double helical gears.

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Efficiency of Worm Gear Drives Under Transient Operating Conditions

Cited by 8 publications

References 16 publications

Wear simulation of worm gears based on an energetic approach

Wear simulation of worm gears based on an energetic approach

Locus of lubricating weak point for the toroidal surface enveloping cylindrical worm drive

Influence of rotational speed and torque on meshing efficiency of double helical gear transmission system

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