Valve Train Calculation Model with Regard to Oil Film Effects

1985 ◽  
Author(s):  
P. Kreuter ◽  
F. Pischinger
Keyword(s):  
Calculation Model ◽  
Valve Train ◽  
Oil Film

A Scattering Similarity Based Calculation Model for Oil Film Identification

Optik ◽  
2021 ◽  
pp. 167340
Author(s):  
Kan Ren ◽  
Jing Zhou ◽  
Minjie Wan ◽  
Guohua Gu ◽  
Qian Chen
Keyword(s):  
Calculation Model ◽  
Oil Film

A Performance Prediction of Microgrooved Bearings Under Mixed Lubrication

2008 ◽  
Author(s):  
Katsuhiro Ashihara ◽  
Hiromu Hashimoto
Keyword(s):  
Film Thickness ◽  
Contact Pressure ◽  
Hydrodynamic Lubrication ◽  
Calculation Model ◽  
Mixed Lubrication ◽  
Severe Condition ◽  
Oil Film ◽  
Precise Prediction ◽  
Lubrication Condition ◽  
Bearing Alloy

In the designs and analysis of engine bearings for automobiles, the precise prediction of the lubrication condition in severe condition is important. In the mixed-elasto-hydrodynamic lubrication analysis, the contact between the projections of surface roughness distributed stochastically is usually considered. This paper describes a theoretical model under the mixed lubrication in the microgrooved bearing. In this modeling, it is assumed that the section shape of microgrooved bearing alloy takes the circular arc form. In the part where contact is caused, the contact pressure is calculated by the Hertzian equation. The elastic deformation of the bearing by the mixed pressure with which oil film pressure and contact pressure are mixed by each allotment ratio is considered. Moreover, the balance requirement between the sum total of mixed pressure on bearing surface and the journal load is met. Under such an assumption, the numerical calculation model is newly obtained to predict the bearing performance in the mixed lubrication of microgrooved bearing. The numeric solutions of EHL based on the mixed lubrication are compared with EHL based on the fluid lubrication. The predicted oil film thickness at the center of bearing by the mixed lubrication model is remarkably thin compared with that by the fluid lubrication model. This shows that the load ability of the oil film thickness decreases by generating contact.

Roller sliding in engine valve train: Effect of oil film thickness considering lubricant composition

2020 ◽  
Vol 149 ◽  
pp. 105829 ◽  
Author(s):  
Muhammad Khurram ◽  
Riaz Ahmad Mufti ◽  
Muhammad Usman Bhutta ◽  
Naqash Afzal ◽  
Muhammad Usman Abdullah ◽  
...  
Keyword(s):  
Film Thickness ◽  
Valve Train ◽  
Engine Valve ◽  
Oil Film ◽  
Lubricant Composition

A NUMERICAL APPROACH TO CALCULATE CREEP IN ROLLER FOLLOWER VALVE TRAIN BASING ON FRICTION AND LUBRICATION MODELING

2015 ◽  
Vol 39 (4) ◽  
pp. 805-818 ◽  
Author(s):  
Muhammad Khurram ◽  
Riaz Ahmad Mufti ◽  
Muhammad Usman Bhutta ◽  
Yousaf Habib ◽  
Arslan Ahmed ◽  
...  
Keyword(s):  
Film Thickness ◽  
Dynamic Analysis ◽  
Numerical Approach ◽  
Mixed Lubrication ◽  
Valve Train ◽  
Normal Loading ◽  
Oil Film ◽  
Tangential Forces ◽  
Motion Parameters ◽  
Friction And Lubrication

A numerical approach basing on friction and lubrication analysis has been developed to determine the creep at cam/roller interface in end pivoted roller finger follower valve train. The kinematic and dynamic analysis at the geometrical mating surfaces of cam and roller follower has been carried out to predict the required instantaneous motion parameters and normal loading whereas the oil film thickness is determined using lubrication analysis. The tangential forces have been computed precisely using elastohydrodynamic and mixed lubrication concept for a complete cam cycle. At low camshaft operating speeds, the creep proves to be low whereas the creep increases significantly under the influence of high tangential loading at higher operating speeds.

Contact Damping and Stiffness Calculation Model for Rough Surface Considering Lubrication in Involute Spur Gear

2021 ◽  
Author(s):  
Gong Cheng ◽  
Ke Xiao ◽  
Jiaxu Wang
Keyword(s):  
Film Thickness ◽  
Contact Stiffness ◽  
Elastohydrodynamic Lubrication ◽  
Spur Gear ◽  
Calculation Model ◽  
Mixed Lubrication ◽  
Asperity Contact ◽  
Crucial Point ◽  
Normal Deformation ◽  
Oil Film

The contact properties of an interface are crucial to the performance of equipment, and it is necessary to study the contact damping and contact stiffness, especially in the case of mixed lubrication. A calculation model for contact damping and contact stiffness considering lubrication was proposed on the basis of the KE contact model and mixed elastohydrodynamic lubrication theory. Both the damping and the stiffness were composed of the oil film portion and the asperity contact portion. Since the damping and the stiffness of oil film mainly depended on the film thickness and the pressure, which can be obtained with the mixed lubrication model, another crucial point was to figure out the contribution of asperity contact. Ignoring the effect of the tangential deformation, the stiffness and the load determined with the normal deformation of the asperity were obtained. Then, the contact damping and the contact stiffness considering lubrication could be derived. Finally, the model was applied to the study of contact damping and stiffness of the involute spur gear.

Analysis of influencing factors on oil film shear torque of hydro-viscous drive

2018 ◽  
Vol 70 (7) ◽  
pp. 1169-1175 ◽  
Author(s):  
Hongwei Cui ◽  
Zisheng Lian ◽  
Long Li ◽  
Qiliang Wang
Keyword(s):  
Influencing Factors ◽  
Experimental Research ◽  
Flow Rate ◽  
Rotation Speed ◽  
Calculation Model ◽  
Film Rupture ◽  
Equivalent Radius ◽  
Content Type ◽  
Oil Film ◽  
Save Energy

Purpose The hydro-viscous drive (HVD) has been widely used in fan transmission in vehicles, fans, and scraper conveyors for step-less speed regulating and soft starting. It is an efficient method to save energy and reduce consumption. This study aims to analyze the influencing factors of oil film shear torque accurately. Design/methodology/approach The shear torque calculation model of double arc oil groove friction pairs was established. The influence of groove structure parameters on shear torque was analyzed. The interaction between viscosity temperature and shear torque was considered. Meanwhile, the equivalent radius was calculated when the rupture of oil film appeared. Finally, the test rig of torque characteristics was set up. The variance of shear torque with the input rotation speed under different oil film thickness, different oil temperature, and different flow rate was seen. Findings The results show that the shear torque increases with the growth of rotation speed. However, the increase of torque is quite gradual because of the effect of the change of viscosity, which is caused by the rise of temperature. The shear torque increases with the decrease of thickness, the increase of inlet flow rate, and the decrease of inlet oil temperature. Meanwhile, when the feeding flow rate is less than the theoretical, the oil film gets ruptured and the shear torque decreases sharply. Originality/value The influence on shear torque during full film shear stage in HVD can be achieved much more accurately through both experimental research and theoretical modeling in which groove parameters, influence of temperature, and oil film rupture are considered. Therefore, the shear torque of HVD can be predicted by theoretical model and experimental research in full film shear stage.

Research on Modeling Method for Oil-Film Stiffness Calculation of Point Contact Based on EHL

2014 ◽  
Vol 945-949 ◽  
pp. 802-810
Author(s):  
Song Sheng Li ◽  
Juan Shao ◽  
Feng Yu ◽  
Jie Ling ◽  
Bin Chen
Keyword(s):  
Contact Region ◽  
Point Contact ◽  
Elastohydrodynamic Lubrication ◽  
Calculation Model ◽  
Oil Film ◽  
Rolling Ball ◽  
Film Distribution ◽  
Lubrication Condition ◽  
Set Up ◽  
Film Stiffness

Internal lubrication condition affects dynamic characteristics of rolling ball bearing in operation.According to the calculating problem of the elastic fluid lubricant film stiffness in point contact zone, the oil-film stiffness calculation model was set up based on the elastohydrodynamic lubrication theory (EHL) ,which considers the oil-film distribution and the pressure characteristic of the whole contact region. The stiffness of the oil-film was obtained from this model and compared with the experiment. The results indicate that the data calculated by the model fit the experiment very well, improving the calculation accuracy of the oil-film stiffness.

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