Measurement of the Journal Locus in the Con-Rod Big-End Bearing of an Automobile Gasoline Engine

1973 ◽  
Vol 95 (2) ◽  
pp. 249-254 ◽  
Author(s):  
M. Hiruma ◽  
S. Furuhama
Keyword(s):  
Film Thickness ◽  
Gasoline Engine ◽  
The Other ◽  
Inertia Force ◽  
Bearing Surface ◽  
Automobile Engine ◽  
Combustion Pressure ◽  
Oil Film ◽  
New Device ◽  
Automobile Gasoline

To measure the absolute oil film thickness or the journal center locus in con-rod big-end bearings of a practical automobile engine, a special new device and procedure have been developed. By means of this method, the measurement could be carried out stably up to full load at 5000 rpm. These measurements revealed that the journal travels along the vicinity of bearing surface by the inertia force. In the combustion period, however, the journal center passes near the center point of the bearing. On the other hand, under a misalignment condition, the minimum oil film thickness depends on the combustion pressure. Therefore in the future many of the problems related to con-rod big-end bearings will be resolved by this method.

The Effect of Oil Evaporation From the Cylinder Wall on Oil Consumption of a Gasoline Engine

2009 ◽  
Author(s):  
Yasuo Harigaya ◽  
Kazuyoshi Yamasuga ◽  
Michiyoshi Suzuki ◽  
Naoki Iijima ◽  
Masaaki Takiguchi ◽  
...  
Keyword(s):  
Film Thickness ◽  
Gasoline Engine ◽  
Hydrodynamic Lubrication ◽  
Film Surface ◽  
Cylinder Wall ◽  
Oil Consumption ◽  
Oil Film ◽  
Evaporation Model ◽  
Low Load ◽  
The Relationship

A new oil evaporation model was developed, combining a thermo-hydrodynamic lubrication model with a conventional oil evaporation model considering the energy balance on the oil film surface. This model assumed that there was evaporation loss of the oil film on the cylinder wall. In addition, the effects of the oil film thickness and types of lubricant in the evaporated oil from the liner were examined. Moreover, the calculated evaporative oil was compared with the measured oil consumption of a gasoline engine. The relationship between the evaporated oil, the lubricant viscosity, and the oil film thickness were clarified using this model. The results showed that the calculated oil evaporation from the cylinder wall closely corresponded to the measured oil consumption under low load conditions.

A Study on the Distribution of Oil Film Thickness in the Circumferential Direction of Oil Ring in a Gasoline Engine

2019 ◽  
Author(s):  
Akemi Ito ◽  
Tadatsugu Hakkaku ◽  
Kazuya Mochiduki ◽  
Keita Tomotsune ◽  
Masatsugu Inui ◽  
...  
Keyword(s):  
Film Thickness ◽  
Piston Ring ◽  
Gasoline Engine ◽  
Axial Direction ◽  
Circumferential Direction ◽  
Sliding Surface ◽  
Oil Consumption ◽  
Measuring Point ◽  
Oil Film ◽  
Cylinder Bore

Abstract Oil traveling upward through the sliding surface of a piston ring causes oil consumption of an engine. Piston rings are designed considering conformability to deformed cylinder bore. However, cylinder deformation sometimes affects strongly oil consumption. It suggests that a piston ring cannot conform dynamically to the cylinder bore. In this study, distribution of oil film thickness of an oil ring was measured for investigating the dynamic conformability. An optical fiber has embedded in the sliding surface of the lower rail of the oil ring, and oil film thickness was measured by laser induced fluorescence method. The measuring point was rotated in the circumferential direction, so the distribution in both the circumferential and the axial direction could be measured. Thick oil films partially were found and it was found that the oil ring did not conformed to the deformed cylinder bore dynamically. Furthermore, such oil film showed thicker value than those expected theoretically. It was showed that dynamic conformability must be considered for piston ring design for reducing oil consumption.

Experimental Analysis of Journal Bearings

1995 ◽  
Vol 117 (3) ◽  
pp. 589-592 ◽  
Author(s):  
A. H. Elkholy ◽  
A. Elshakweer
Keyword(s):  
Film Thickness ◽  
Experimental Technique ◽  
Experimental Analysis ◽  
Journal Bearing ◽  
Journal Bearings ◽  
Bearing Surface ◽  
General Outline ◽  
Modes Of Operation ◽  
Oil Film ◽  
Design Charts

This study presents a comprehensive technique, which could be applied to almost any rotating equipment to identify and diagnose journal bearing problems that relate to metal-to-metal bearing surface contact. Orbital measurements that describe bearing parameters in different modes of operation were experimentally obtained and analyzed. Such parameters may include: attitude angle, minimum oil film thickness, and the possibility of metal-to-metal rubbing occurrence. The general outline of the presented experimental technique was substantiated using the Raimondi–Boyd well-documented design charts and good correlation between experimental and analytical results was obtained.

The Influence of Injection Pockets on the Performance of Tilting-Pad Thrust Bearings—Part II: Comparison Between Theory and Experiment

2007 ◽  
Vol 129 (4) ◽  
pp. 904-912 ◽  
Author(s):  
Niels Heinrichson ◽  
Axel Fuerst ◽  
Ilmar Ferreira Santos
Keyword(s):  
High Pressure ◽  
Film Thickness ◽  
Pressure Distribution ◽  
The Other ◽  
Oil Film ◽  
Thrust Bearings ◽  
Pressure Injection ◽  
Tilting Pad ◽  
Oil Injection ◽  
High Pressure Injection

This is Part II of a two-part series of papers describing the effects of high-pressure injection pockets on the operating conditions of tilting-pad thrust bearings. The paper has two main objectives. One is an experimental investigation of the influence of an oil injection pocket on the pressure distribution and oil film thickness. Two situations are analyzed: (i) when the high-pressure oil injection is turned off and (ii) when the high-pressure injection is turned on. The other objective is to validate a numerical model with respect to its ability to predict the influence of such a pocket (with and without oil injection) on the pressure distribution and oil film thickness. Measurements of the distribution of pressure and oil film thickness are presented for tilting-pad thrust bearing pads of ∼100cm2 surface area. Two pads are measured in a laboratory test rig at loads of ∼1.5MPa and ∼4.0MPa and velocities of up to 33m∕s. One pad has a plain surface. The other pad has a conical injection pocket at the pivot point and a leading-edge taper. The measurements are compared to theoretical values obtained using a three-dimensional thermoelastohydrodynamic (TEHD) numerical model. At the low load, the theoretical pressure distribution corresponds well with the measured values for both pads, although the influence of the pocket is slightly underestimated. At the high load, large discrepancies exist for the pad with an injection pocket. It is argued that the discrepancies are due mainly to geometric inaccuracies of the collar surface, although they may to some extent be due to the simplifications employed in a Reynolds equation description of the pocket flow. The measured and theoretical values of oil film thickness compare well at low loads and velocities. At high loads and velocities, discrepancies grow to up to 25%. This is due to the accuracy of the measurements. When using hydrostatic jacking the model predicts the start-up behavior well.

Effects of Thermal Conductivity of Contacting Surfaces on Point EHL Contacts

2003 ◽  
Vol 125 (4) ◽  
pp. 731-738 ◽  
Author(s):  
M. Kaneta ◽  
P. Yang
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Film Thickness ◽  
Temperature Variation ◽  
Optical Interferometry ◽  
The Other ◽  
Oil Film ◽  
Entrainment Velocity ◽  
Minimum Film Thickness ◽  
Thermal Ehl

With actual and virtual materials, the effects of the thermal conductivity of contacting surfaces on EHL are investigated through experimental analyses using the optical interferometry technique and the Newtonian thermal EHL analyses in consideration of the variation of oil properties in all directions within the film. A mineral bright stock is used as a lubricant. It is found that the distributions of pressure and film thickness, including the minimum film thickness, are influenced very much by the entrainment velocity and the slide-roll ratio. One of the causes is the temperature-viscosity wedge action produced by the temperature variation across the oil film, and the other is an increase in oil temperature at the entrance of the contact due to the heat produced by the compression work and the shearing of the oil. The degree of both influences depends on the thermal properties of contacting materials.

scholarly journals Dynamic characteristics of high-speed gasoline engine turbocharger based on thermo-elasto-hydrodynamic lubrication bearing model and flexible multibody dynamics method

2020 ◽  
Vol 103 (1) ◽  
pp. 003685041989771
Author(s):  
Can song Gu ◽  
Zhao cheng Yuan ◽  
Zheng rui Yang ◽  
Jia xin Liu ◽  
Hong liang Li
Keyword(s):  
Film Thickness ◽  
Dynamic Characteristics ◽  
Gasoline Engine ◽  
Hydrodynamic Lubrication ◽  
Synthesis Method ◽  
Calculation Model ◽  
Oil Film ◽  
Surface Vibration ◽  
Flexible Multibody ◽  
Dynamics Method

A flexible multibody dynamic calculation model based on thermo-elasto-hydrodynamic lubrication bearing model was established. This numerical simulation method provided a more realistic turbocharger calculation model and a more reliable theoretical support for studying the dynamic vibration characteristics of the floating ring bearing turbocharger system. In order to fully consider the dynamic characteristics of each component, the behavior of the floating ring bearing was described by generalized incompressible Reynolds equation in thermo-elasto-hydrodynamic lubrication model. The flexible body substructure models were established by the modal synthesis method. Based on this model, the direct mathematical model of the relationship between the eccentricity of the rotor and the oil film clearance on the turbocharger’s surface vibration was established. The influence of eccentricity and oil film thickness on the surface vibration of the turbocharger body was calculated by transient dynamics method. The results showed that the eccentricity of the rotor and the vibration of turbocharger housing were monotonic functions, but the interaction between the whirl of internal and external oil films made the mechanism of the influence of the oil film thickness on the turbocharger body’s vibration complicated. The research provided a new idea for the structural vibration and synchronous noise control of the supercharger.

The Piston Ring at Top Dead Centre

1980 ◽  
Vol 194 (1) ◽  
pp. 373-381 ◽  
Author(s):  
S. L. Moore ◽  
G. M. Hamilton
Keyword(s):  
Diesel Engine ◽  
Film Thickness ◽  
Piston Ring ◽  
Cylinder Liner ◽  
The Other ◽  
Oil Film ◽  
Compression Ring ◽  
Capacitance Transducers ◽  
Dead Centre

Using capacitance transducers the oil film thickness between the compression ring and the cylinder liner of a diesel engine has been investigated in the region of top dead centre. Results are presented from two engines, one supercharged and the other normally aspirated. Calculations of the film thickness have been carried out and these are compared with the measured results.

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