Modeling and analysis of the dynamic efficiency of manual transmission/reducer

Wang, B; Lu, Zhangying; Chen, X B; Wang, P; Luo, Wenjun; Xu, Hongli

doi:10.1007/s12239-015-0043-0

Cited by 11 publications

(6 citation statements)

References 11 publications

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“…The reducer's performance and service life are related to reducer's structural parameters, materials, manufacturing, and surface working temperature of reducer's components [1]. Energy loss during operation of a gear reducer is mainly distributed in forms of heat to atmosphere through surfaces of the reducer and stored energy in solid components and lubricants in the reducer [2]. In addition, too high gear surface temperature will cause wear and heat stress of reducer structure, which further affect service life and working efficiency of the reducer [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of Lubricant Supply on Thermal and Efficient Performances of a Gear Reducer for Electric Vehicles

Zhu

Xiang

Luo

et al. 2021

Journal of Tribology

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The amount of lubricating oil in a gear reducer greatly influences components' temperature and efficiency of the reducer. A thermal network simulation model of a gear reducer for electric vehicles based on AMESim software was built for thermal and efficiency analysis of the reducer, where heat production and transfer processes of each component in the reducer are considered. Moreover, secondary development sub-models were developed to real timely calculate the convection coefficients based on different lubricating oil temperatures and working conditions. Next, the experiments were conducted to verify the developed model regarding transmission efficiency and lubricating oil equilibrium temperature in the reducer. The deviation between the numerical and experimental results is below 5%, which indicates high accuracy of the developed thermal network model. Thereafter, efficiency and heat balance simulation tests under different working conditions were performed to determine an optimal lubricating oil supply which is 14 mm gear-oil-immersion oil supply in this study. Finally, a comparison between the reducer with the optimal oil supply and that with normally used 22 mm gear-oil-immersion supply in the NEDC cycle in low temperature was conducted. The reducer with the optimal oil supply shows 1.032% energy saving. The method presented in this paper provides a good guide to design and optimization of the gear reducer for electrical vehicles.

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Section: Introductionmentioning

confidence: 99%

Influence of Lubricant Supply on Thermal and Efficient Performances of a Gear Reducer for Electric Vehicles

Zhu

Xiang

Luo

et al. 2021

Journal of Tribology

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show abstract

“…The main reason of low transmission efficiency at low temperatures is the need to overcome forces of mechanical and hydraulic friction inside a transmission reduction gear. According to the given data (Wang et al, 2015), transmission units power loss is mainly connected to mechanical friction in gears engaged in torque transfer as well as hydraulic losses when splashing and stirring motor oil. Besides, the research (Liebrecht et al, 2015) indicates the need to consider power losses when overcoming friction torque in roller bearings.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Resource Consumption When using Vehicle Transmissions at Low Temperatures

Dolgushin¹,

Воронин²,

Mamonov³

2019

J. Eng. Appl. Sci.

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This research details the approach to justify optimum thermal conditions for a vehicle transmission unit. This approach is based on the integrated criterion which comprises aggregated energy expenditures to warm up a transmission reduction gear and to overcome forces of mechanical and hydraulic friction inside its components. Thermal working conditions of a unit shall be considered optimum when energy expenditures are the lowest. Justification and development of technologies to provide optimum thermal conditions of a unit shall be based on comparison of optimum temperature values and temperature values of transmission oil stabilization. If optimum temperature exceeds stabilization temperature, then additional heat sources shall be used if it is lower then heat shall be transferred to other units. Analysis of optimum thermal conditions of the KAMAZ transmission shows that the transmission unit has an excessive thermal potential. Optimum temperature exceeds stabilization temperature by 5 K, so, excessive thermal energy must be transferred.

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“…According to them the windage power loss occurs due to interaction of gears with air-oil mixture and squeezing of the lubricant at gear mesh interface. The efficiency of the vehicle transmission system considering churning loss, bearing loss and windage loss on spur gear was studied by Wang et al, [3] using analytical and experimental results. They concluded that the losses estimated using analytical equations was in line with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Power loss analysis in altered tooth-sum spur gearing

2018

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Abstract. The main cause of power loss or dissipation of heat in case of meshed gears is due to friction existing between gear tooth mesh and is a major concern in low rotational speed gears, whereas in case of high operating speed the power loss taking place due to compression of air-lubricant mixture (churning losses) and windage losses due to aerodynamic trial of air lubricant mixture which controls the total efficiency needs to be considered. Therefore, in order to improve mechanical efficiency it is necessary for gear designer during gear tooth optimization to consider these energy losses. In this research paper the power loss analysis for a tooth-sum of 100 altered by ±4% operating between a specified center distance is considered. The results show that negative altered tooth-sum gearing performs better as compared to standard and positive altered tooth-sum gearing.

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Modeling and analysis of the dynamic efficiency of manual transmission/reducer

Cited by 11 publications

References 11 publications

Influence of Lubricant Supply on Thermal and Efficient Performances of a Gear Reducer for Electric Vehicles

Influence of Lubricant Supply on Thermal and Efficient Performances of a Gear Reducer for Electric Vehicles

Optimization of Resource Consumption When using Vehicle Transmissions at Low Temperatures

Power loss analysis in altered tooth-sum spur gearing

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