Research of Flow Field Simulation for Lubrication System and Effect Evaluation on a 7-Speed Dual Clutch Transmission

Lin, Yinhui; Hu, Zhihua; Xiong, Chaoqiang; Miao, Zhuang; Jia, Yuan; Chen, Yong; Luo, Daguo; Zhao, Fei

doi:10.1007/978-3-642-33835-9_27

Cited by 6 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure 2, different methods have been applied in previous research to overcome this difficulty. Such methods include the nonteeth method (Lemfeld et al, 2007;Lemfeld & Frana, 2009), cutting-teeth method (Concli, Conrado, & Gorla, 2014; Lin et al, 2013;Moshammer et al, 2006) and gearseparation method (Dong, Lin, & He, 2012;Gorla et al, 2013;Li et al, 2009). The non-teeth method and cuttingteeth method eliminate all or part of the gear teeth and considerably change the gear geometry.…”

Section: Gear Operationmentioning

confidence: 99%

Numerical and experimental investigation of splashing oil flow in a hypoid gearbox

Peng

Liu

Zhong

2018

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

The oil distribution and churning loss are the main concerns in the design of a lubrication system for a gear transmission. This article describes a numerical method of simulating the splashing oil flow in a hypoid gearbox, obtaining the oil distribution, and calculating the churning loss. A threedimensional numerical model is built to simulate the complex oil flow when hypoid gears splash oil inside the box. The volume of fluid (VOF) model is applied to describe the oil-air two-phase flow characteristics. In addition, the flank-moving technique is introduced to overcome the difficulty of generating cells in the tooth-meshing zone. To validate the numerical approach, a test rig is designed to observe the oil distribution in the gearbox and measure the churning loss of the hypoid gears. The comprehensive experimental investigation illustrates that the numerical results correspond well with the measured results. The results of this article show that the numerical method can accurately predict the complex oil flow in a hypoid gearbox and provide a numerical approach for investigating the oil flow and churning loss inside real-vehicle axle housing. This model can serve as a design optimization tool in the future. ARTICLE HISTORY

show abstract

Section: Gear Operationmentioning

confidence: 99%

Numerical and experimental investigation of splashing oil flow in a hypoid gearbox

Peng

Liu

Zhong

2018

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

show abstract

“…Through the LRA entire transmissions have been modelled, e.g., a dual clutch transmission [118] and a manual transmission [119]. The oil jet was studied for orthogonal face gear drive [120], helical gears [47], and spiral bevel gears [50].…”

Section: Categorization Of Relevant Papers Exploiting the Local Remes...mentioning

confidence: 99%

Computational Fluid Dynamics Applied to Lubricated Mechanical Components: Review of the Approaches to Simulate Gears, Bearings, and Pumps

Maccioni

Concli

2020

Applied Sciences

View full text Add to dashboard Cite

The lubrication of the mechanical components reduces friction, and increases the efficiency and the reliability. However, the interaction of moving components with the lubricant leads to power losses due to viscous and inertial effects. Nowadays, the study of lubricant behavior can be carried out through computational fluid dynamics (CFD) simulations. Nevertheless, the modeling of the computational domain within complex mechanical systems (e.g., ordinary, planetary and cycloidal gearboxes, roller bearings, and pumps) requires the exploitation of specific CFD techniques. In the last decades, many mesh-based or meshless approaches have been developed to deal with the complex management of the topological changes of the computational domain or the modeling of complex kinematics. This paper aims to collect and to classify the scientific literature where these approaches have been exploited for the study of lubricated mechanical systems. The goal of this research is to shed a light on the current state of the art in performing CFD analysis of these systems. Moreover, the objective of this study is to stress the limits and the capabilities of the main CFD techniques applied in this field of research. Results show the main differences in terms of accuracy achievable and the level of complexity that can be managed with the different CFD approaches.

show abstract

“…A weak subsurface continuation of the boundary layer (7) is indicated by some bubbles from the boundary layer traveling forward just below the surface. The fluid sheet splashes on the vertical wall facing the emerging side of the gear and forms the primary wall flow (8). The same splashes occur with lower intensity, forming secondary wall flows at the upper (9) and opposite vertical walls (10).…”

Section: Laser Sheet and Flash Visualization Of The Typical Global Flmentioning

confidence: 99%

“…The authors of [2] show a two-phase flow simulation in a jetlubricated bevel gear-pair in auxiliary equipment of a jet engine using FVM, VOF and a dynamic mesh. Two-phase FVM VOF k-ε simulations are presented in [3][4][5][6][7], and CFD simulation of a full 7-speed dual clutch automotive transmission including jet and dip lubrication is presented in [8]. Having such a task as an industrial problem in the early design phase, a great difficulty is encountered when one would like to simulate such complex two-phase flows reliably within realistic time and computational constraints.…”

mentioning

confidence: 99%

Mass Flux Distribution Measurements and Visualizations of a Fluid Sheet Generated by a Partially Immersed Dip-Lubricated Gear

Várhegyi

Kristóf

2016

Period. Polytech. Mech. Eng.

View full text Add to dashboard Cite

IntroductionInvestigation of the flow in a gearbox of dip-lubricated transmission is a challenging task both numerically and experimentally. Such flows include two or more phases: the lubricant liquid, air and solved and insoluble additives, bubble and drop formation and coalescence, thin films, turbulence, heat and mass transport; viscoelasticity and drastic changes in other transport properties of the lubricant due to heat flash and pressure rise in the vicinity of the contact region.Despite the complex flow phenomena the designer of the transmission may very well be interested only in the power losses due to churning of the oil and the effectiveness of the dip-lubrication by verifying that the splashing oil reaches some specific locations, a gear or a bearing, which was originally not immersed in the oil bath in standstill.Several authors report successful simulations. In [1], singlephase FVM VOF k-ε simulations using dynamic mesh in a twogear transmission gearbox fully immersed in oil are presented. The authors of [2] show a two-phase flow simulation in a jetlubricated bevel gear-pair in auxiliary equipment of a jet engine using FVM, VOF and a dynamic mesh. Two-phase FVM VOF k-ε simulations are presented in [3][4][5][6][7], and CFD simulation of a full 7-speed dual clutch automotive transmission including jet and dip lubrication is presented in [8]. Having such a task as an industrial problem in the early design phase, a great difficulty is encountered when one would like to simulate such complex two-phase flows reliably within realistic time and computational constraints. In [9], the authors use a moving reference frame to obtain a quasi-steady CFD simulation of a single phase flow around a single gear. in order to have a 50-fold reduction in computational demand. In [10], a method of dimensional analysis to determine the dominant heat generation mechanism between contact heating or churning losses and then a computational method for thermohydrodynamic simulation decoupling the time scales for heat conduction in the gear and the unsteady turbulent two phase flow around a single jet lubricated gear are presented.In the above examples, mesh or turbulence or two phase model independence studies are usually not shown. This brings

show abstract

Research of Flow Field Simulation for Lubrication System and Effect Evaluation on a 7-Speed Dual Clutch Transmission

Cited by 6 publications

References 3 publications

Numerical and experimental investigation of splashing oil flow in a hypoid gearbox

Numerical and experimental investigation of splashing oil flow in a hypoid gearbox

Computational Fluid Dynamics Applied to Lubricated Mechanical Components: Review of the Approaches to Simulate Gears, Bearings, and Pumps

Mass Flux Distribution Measurements and Visualizations of a Fluid Sheet Generated by a Partially Immersed Dip-Lubricated Gear

Contact Info

Product

Resources

About