Drop-On-Demand Lubrication of Gears: A Feasibility Study

Mirza, M. R.; Yilmaz, M.; Thieme, E.; Lohner, Thomas; Venner, Cornelis H.

doi:10.3389/fmech.2021.746407

Cited by 5 publications

(5 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the test gear of type LowLoss, a strong reduction of T LP is achieved and the operating range under MQ lubrication is extended. The results are in agreement with findings of Höhn et al (2009), Mirza et al (2021), Ebner et al (2018) and Bobzin et al (2019Bobzin et al ( , 2020.…”

Section: Comparison Of Dip and Minimum Quantity Lubricationsupporting

confidence: 93%

“…Due to very limited heat Figure 6 Total and no-load torque loss (top) and pinion tooth bulk temperature (bottom) over the pitch line velocity for test gears of type C mod (left) and LowLoss (right) under dip and MQ lubrication dissipation, the tooth bulk temperature # M1 is highest and the thermal load limit is reached at v t > 8.3 m/s. The results of Mirza et al (2021) at the same test rig and operating conditions under DoD lubrication show a thermal load limit for v t > 2.0 m/s, which is related to the low thermal effusivity of ceramic spacer sleeves and bushings used for electrical contact resistance measurements.…”

Section: Gearbox Lossesmentioning

confidence: 87%

“…Due to very limited heat dissipation, the tooth bulk temperature ϑ M1 is highest and the thermal load limit is reached at v t > 8.3 m/s. The results of Mirza et al (2021) at the same test rig and operating conditions under DoD lubrication show a thermal load limit for v t > 2.0 m/s, which is related to the low thermal effusivity of ceramic spacer sleeves and bushings used for electrical contact resistance measurements.…”

Section: Gearbox Lossesmentioning

confidence: 87%

“…Reduced no-load losses were observed compared to dip lubrication, especially due to lower churning and squeezing losses. Höhn et al (2009) and Mirza et al (2021) investigated minimum quantity (MQ) and drop-on-demand (DoD) lubrication to drastically reduce the lubricant supply to gears. The results show compared to dip and injection lubrication lower no-load and similar load-dependent losses, but also higher component temperatures and lower thermal load limits due to limited heat dissipation.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Gear and bearing power losses: from dip to minimum quantity lubrication

Yilmaz

Önüt²,

Lohner³

et al. 2022

ILT

View full text Add to dashboard Cite

Purpose This paper aims to address the influence of lubrication methods on operational characteristics, power losses and temperature behavior of gears and bearings. It contributes to the improvement of resource and energy efficiency of geared transmissions. Design/methodology/approach Experimental investigations were performed at a gear and bearing power loss test rig. Thereby, dip lubrication, injection lubrication with injection volumes from 0.05 to 2.00 l/min and minimum quantity (MQ) lubrication with an injection volume as little as 28 ml/h were considered. Measurements were evaluated in terms of no-load and load-dependent power loss, bulk temperatures and mean gear coefficients of friction. Findings Results show strongly reduced no-load gear and bearing losses for lubrication methods with low lubricant quantities. Load-dependent losses are similar to conventional lubrication methods and tend to be lower at high speed. This is related to higher bulk temperatures, as the heat dissipation of lubrication methods with low oil quantities is limited. Limited thermal load limits were shown to be extended by LowLoss gears. Originality/value Systematic investigations were conducted to evaluate the influence of dip, injection and MQ lubrication on power loss and temperature behavior of gears and bearings. The results of this study support further research on needs-based lubrication methods for gearboxes.

show abstract

Section: Comparison Of Dip and Minimum Quantity Lubricationsupporting

confidence: 93%

Section: Gearbox Lossesmentioning

confidence: 87%

Section: Gearbox Lossesmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Gear and bearing power losses: from dip to minimum quantity lubrication

Yilmaz

Önüt²,

Lohner³

et al. 2022

ILT

View full text Add to dashboard Cite

show abstract

“…Efforts to reduce power losses are particularly concentrated on gears [3]. One approach is to reduce no-load gear power loss by, e.g., reducing the viscosity or minimizing the lubricant quantity in order to keep churning, squeezing, impulse and ventilation losses low [4,5]. Another approach is to reduce the load-dependent gear power loss P LGP , which often represents a large share calculated by:…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Low-Loss Gear Geometry Using a Thermal Elastohydrodynamic Simulation including Mixed Lubrication

et al. 2022

View full text Add to dashboard Cite

Low-loss gears are an interesting design approach for increasing the efficiency and thermal load limits of gearboxes. The loss-optimized gear geometry concentrates sliding around the pitch point, which results in low load-dependent gear power losses. In this study, a method for modeling transient EHL (elastohydrodynamically lubricated) contacts in gear mesh considering mixed lubrication and thermal effects is introduced and applied to analyze the tribological behavior of a low-loss gear geometry. Special focus is placed on local frictional losses to analyze the role of the thermal effects of the gear mesh. Although a thermal reduction in fluid friction is observed, the overall effect on total frictional losses of the low-loss gear geometry is evaluated to be very small. The edge geometry strongly influences the lubricant film thickness and frictional power losses.

show abstract