Efficiency analysis of spur gears with a shifting profile

Diez-Ibarbia, A.; Rincón, Alfonso Fernández del; Iglesias, Miguel Mauricio; De-Juan, Ana; García, Pablo; Viadero, F.

doi:10.1007/s11012-015-0209-x

Cited by 49 publications

(36 citation statements)

References 17 publications

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“…Gearboxes are used to transmit the power from the engine or motor to the wheels in automotive Industry [7,15,20,21]. Nevertheless, they are not only used for this specific application but in aeronautic [3], energy [19,22], agricultural sectors [16], among others.…”

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confidence: 99%

Gear transmission rattle: Assessment of meshing forces under hydrodynamic lubrication

2019

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Noname manuscript No.(will be inserted by the editor) GEAR TRANSMISSION RATTLE: ASSESSMENT OF MESHING FORCES UNDER HYDRODYNAMIC LUBRICATIONA. Fernandez-Del-Rincon · A. Diez-Ibarbia · S. TheodossiadesReceived: date / Accepted: date Abstract The dynamic behavior of gear transmissions poses several challenges from the standpoint of design and requires the availability of more advanced models capable of simulating a wide range of operating conditions. In this paper, several formulations to represent efforts related to the lubricant in gear transmissions subjected to reduced torque levels has been assessed. Under these conditions, the lubrication regime is hydrodynamic and the dynamic behavior of the meshing contacts can happen in different scenarios depending on both the lubricant properties and operating conditions. Such problems are cumbersome in gear transmissions in which acoustic performance is a determining design factor, such as in car applications. In this regard, gear rattle is one of the subjects of concern by powertrain designers. In spite of several authors have approached this phenomena, the most recent interest is focused on the role played by the lubricant. The variety of fundamentals and aims of the developed models in this respect requires a better understanding of the effect taken into account by the different formulations in the accurate modeling of hydrodynamic lubrication in gears subjected to low torques. This is the reason why, in this work, several alternatives currently available in the literature to address the formulation of efforts in hydrodynamic regime was collected and presented. Such formulations were implemented in a transmission model previously developed by the authors which was used to simulate different operating conditions in order to assess the results obtained with each one of the considered formulations.

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Gear transmission rattle: Assessment of meshing forces under hydrodynamic lubrication

2019

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“…The efficiency calculation methodology was exposed in previous studies [9]. Consequently, only a few details necessary for the work comprehension are described next.…”

Section: Efficiency Calculationmentioning

confidence: 99%

“…As something worth of mention, this LCM takes into account the torque level and profile modification effects on the friction coefficient and load sharing. This LCM has been previously developed by the authors [13,16,44], extended to the modelling of planetary gears [20,21] and currently used to calculate the efficiency of spur gear transmissions [9,10]. This LCM allows for including profile modifications, which affect directly the dynamic behaviour and efficiency of the system, as well as opens the possibility of studying manufacturing and assembly errors [14,15] effects on power losses.…”

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confidence: 99%

Frictional power losses on spur gears with tip reliefs. The friction coefficient role

Diez-Ibarbia

Rincón

De-Juan

et al. 2018

Mechanism and Machine Theory

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In this proposal, the effect of the friction coefficient on the efficiency of spur gears with tip reliefs was analysed. For this purpose, the efficiency values using an average friction coefficient along the mesh cycle were compared with those obtained implementing an enhanced friction coefficient formulation, which is based on elastohydrodynamic lubrication fundamentals. In this manner, it can be established the differences between both formulations in the efficiency and friction coefficient values, as well as the advantages of using this enhanced friction coefficient with respect to formulations implemented in traditional approaches of efficiency calculation. In addition to studying the impact of the friction coefficient choice on efficiency, the profile modifications influence on the friction coefficient and efficiency was also assessed. In this regard, three tip relief case studies were set out; pinion tip reliefs, driven wheel tip reliefs and profile modifications in both gears. From the results, it was inferred that the choice of friction coefficient formulation clearly influences the efficiency in gear transmissions with tip reliefs, obtaining discrepancies between both formulations with regard to which tip relief case study provides the lowest efficiency values.

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“…The methodology to calculate the efficiency has been presented in previous works [7]. Accordingly, in this section, only a few details, which are necessary for the understanding of the work, are presented for the sake of simplicity.…”

Section: Efficiency Calculationmentioning

confidence: 99%

Frictional power losses on spur gears with tip reliefs. The load sharing role

Diez-Ibarbia

Rincón

De-Juan

et al. 2017

Mechanism and Machine Theory

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The load sharing impact on the efficiency of spur gears with modified profile was assessed in this work. The aim was to analyse the influence of the profile modifications on the load sharing, which also considers the effect of the torque level on the system deflections, and how these load sharing variations affected the system efficiency. Due to the frictional effect importance on power losses, in the operating conditions considered, sliding friction between teeth in presence of lubricant was studied in this proposal. The results established that tip relief improves the efficiency of the system due to the reduction of effective contact ratio. Moreover, there is a tip relief which makes optimal the efficiency in specific operating conditions, corresponding to the unit value of the effective contact ratio. Thus, the main conclusion of this work is that the tip relief which makes optimal the efficiency coincides with the theoretical dynamic optimum of the transmission.

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Efficiency analysis of spur gears with a shifting profile

Cited by 49 publications

References 17 publications

Gear transmission rattle: Assessment of meshing forces under hydrodynamic lubrication

Gear transmission rattle: Assessment of meshing forces under hydrodynamic lubrication

Frictional power losses on spur gears with tip reliefs. The friction coefficient role

Frictional power losses on spur gears with tip reliefs. The load sharing role

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