Mixed Lubrication Analysis of Piston Pin Bearing in Diesel Engine With High Power Density

2011 ◽  
Author(s):  
Xiaoli Wang ◽  
Jingfang Du ◽  
Junyan Zhang
Keyword(s):  
Diesel Engine ◽  
Film Thickness ◽  
Power Density ◽  
Elastic Deformation ◽  
High Power ◽  
Reynolds Equation ◽  
Mixed Lubrication ◽  
High Power Density ◽  
Film Pressure ◽  
Oil Film

Based on the unified Reynolds equation and Fast Fourier Transform (FFT) method, the mixed lubrication characteristics of piston pin bearing in diesel engine with high power density are numerically simulated. Firstly, the unified Reynolds equation and the elastic deformation equation are solved simultaneously, and then the effects of viscosity-pressure on the maximum film pressure, the minimum oil film thickness and the piston pin orbit are analyzed. It is shown that for the semi-floating piston pin bearing with high power density, when viscosity-pressure is taken into consideration, both the minimum oil film thickness and the maximum oil film pressure increase, while the elastic deformation of the area in which the maximum load applies decreases. The transient diagrams of the relative position between the piston pin and its bearing within a whole loading period are given. It is also indicated that the eccentricity ratio of piston pin bearing along the direction of piston stroke is greater because of the greater load exerting on the back of the semi-floating piston pin bearing and thus resulting in the obvious deformation in the back area. This result is in good agreement with the existing real failure mode of the piston pin bearing with high power density. In addition, the effects of bearing clearance and length on the minimum oil film thickness are investigated respectively. It is shown that the smaller bearing clearance and the greater width are beneficial for the increasing of the minimum oil film thickness of piston pin bearing.

The Analysis of the Deformation and Contact Lubrication Problem of HPD Diesel Engine Piston Pin Bearing Based on the FFT Method

2012 ◽  
Vol 538-541 ◽  
pp. 1962-1966
Author(s):  
Jun Yan Zhang ◽  
Shu Kui Han
Keyword(s):  
Diesel Engine ◽  
Film Thickness ◽  
Power Density ◽  
Elastic Deformation ◽  
High Power ◽  
Reynolds Equation ◽  
Pressure Effect ◽  
High Power Density ◽  
Film Pressure ◽  
Piston Stroke

Based on the unified Reynolds equation model and fast Fourier transform (FFT) method, the lubrication performance of the piston pin bearing for high power density diesel engine was studied by numerical simulation. First of all, through the coupled solving of a unified Reynolds equation and elastic deformation equation, the influence of the viscous-pressure effect on the maximum film pressure and the minimum oil film thickness for piston pin bearing are investigated. The results show that, after considering the viscosity-pressure effect, the minimum oil film thickness and the maximum film pressure of semi-floating piston pin bearings for high power density increase, and the elastic deformation decreases in greatest load position. It confirms that the bearing capability is greatly enhanced while the viscosity- pressure effect is considered. Secondly, The eccentricity ratio of the piston pin bearing in vertical direction of the piston stroke is smaller, however it is much larger in the downward direction of the piston stroke, which indicate that the below area of the piston pin bearing bears greater load and occurs larger deformation. This is consistent with the reality that the below area of the piston pin bearing is prone to damage and wear

Analysis of Oil Film Thickness on a Piston Ring of Diesel Engine: Effect of Oil Film Temperature

2001 ◽  
Author(s):  
Yasuo Harigaya ◽  
Michiyoshi Suzuki ◽  
Masaaki Takiguchi
Keyword(s):  
Diesel Engine ◽  
Temperature Distribution ◽  
Heat Flow ◽  
Film Thickness ◽  
Piston Ring ◽  
Reynolds Equation ◽  
Energy Equation ◽  
Two Dimensional ◽  
Oil Film ◽  
The Mean

Abstract This paper describes that an analysis of oil film thickness on a piston ring of diesel engine. The oil film thickness has been performed by using Reynolds equation and unsteady, two-dimensional (2-D) energy equation with a heat generated from viscous dissipation. The temperature distribution in the oil film is calculated by using the energy equation and the mean oil film temperature is computed. Then the viscosity of oil film is estimated by using the mean oil film temperature. The effect of oil film temperature on the oil film thickness of a piston ring was examined. This model has been verified with published experimental results. Moreover, the heat flow at ring and liner surfaces was examined. As a result, the oil film thickness could be calculated by using the viscosity estimated from the mean oil film temperature and the calculated value is agreement with the measured values.

Developing of High Power Density Diesel Engine Oil

2011 ◽  
Vol 233-235 ◽  
pp. 171-174
Author(s):  
Fu Chuan Huang ◽  
Yun Guo Xie ◽  
Mao Li Yang ◽  
Hui Juan Luo ◽  
Pan Tong ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Power Density ◽  
High Power ◽  
Chemical Properties ◽  
Engine Oil ◽  
Lubricating Oil ◽  
High Power Density ◽  
Operating Characteristics ◽  
Compact Structure ◽  
Base Oil

For high power density diesel engine operating characteristics and its unique compact structure, the development of new high power density diesel engine oil referred to the latest diesel engine oil standard GB 11122-2006. Through the comprehensive assessment of physical and chemical properties, the composite of poly a-olefin (PAO) and polymer esters was determined as base oil,and added high-performance additives. This oil developed has clean dispersion, antioxidation, anti-wear , anti-corrosion and other properties. the lubricating oil can well satisfy the performance requirements of high power density diesel engine.

Energy Impact Analysis of Switchable Coolant Pump in a High Power Density Diesel Engine

2021 ◽  
Author(s):  
Nehal Sanjay ◽  
Praveer Kirtimohan Jain ◽  
C Chendil ◽  
Sivasubramamanian R ◽  
Parag Daithankar
Keyword(s):  
Diesel Engine ◽  
Power Density ◽  
High Power ◽  
Impact Analysis ◽  
High Power Density ◽  
Coolant Pump ◽  
Energy Impact

The Analysis of Lubrication for HPD Diesel Engine Piston Pin Bearing

2012 ◽  
Vol 550-553 ◽  
pp. 3214-3218
Author(s):  
Jun Yan Zhang ◽  
Shu Kui Han
Keyword(s):  
Diesel Engine ◽  
Film Thickness ◽  
Reynolds Equation ◽  
Vertical Direction ◽  
Equation Model ◽  
Oil Film ◽  
Engine Piston ◽  
Lubrication Performance ◽  
Deformation Equation ◽  
Piston Stroke

Based on the unified Reynolds equation model and fast Fourier transform (FFT) method, the lubrication performance of the piston pin bearing for high power density diesel engine was studied by numerical simulation. First of all, through the coupled solving of a unified Reynolds equation and elastic deformation equation, the orbit of journal center for piston pin bearing is investigated. The eccentricity ratio of the piston pin bearing in vertical direction of the piston stroke is smaller, however it is much larger in the downward direction of the piston stroke, which indicate that the below area of the piston pin bearing bears greater load and occurs larger deformation. This is consistent with the reality that the below area of the piston pin bearing is prone to damage and wear. Secondly, the influence of the different bearing clearances and width on the minimum oil film thickness is discussed, The results show that the minimum oil film thickness is increased, while the width of piston pin bearing is increased or the clearance of piston pin bearing is decreased.

scholarly journals Application of Space-time Conservation Element and Solution Element Method in Intake and Exhaust Flows of High Power Density Diesel Engine

2013 ◽  
Vol 9 (3) ◽  
pp. 171-175 ◽  
Author(s):  
You Guo-dong ◽  
Xu Chun-long ◽  
Xu Jun-feng ◽  
Zhu Ming ◽  
Wang Zeng-quan
Keyword(s):  
Diesel Engine ◽  
Power Density ◽  
High Power ◽  
Space Time ◽  
High Power Density ◽  
Solution Element ◽  
Element Method
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