TEHD Analysis of Thrust Bearings With PTFE-Faced Pads

2005 ◽  
Vol 128 (1) ◽  
pp. 49-58 ◽  
Author(s):  
S. B. Glavatskih ◽  
Michel Fillon
Keyword(s):  
Experimental Investigation ◽  
Film Thickness ◽  
Thermal Performance ◽  
Power Loss ◽  
Measured Temperature ◽  
Oil Film ◽  
Thrust Bearings ◽  
Theoretical Results

Results of a combined theoretical and experimental investigation into the operation of thrust bearings with polytetrafluoroethylene (PTFE)-faced pads are reported. Bearing performance is analyzed in terms of temperature, power loss, oil film thickness and pressure. These parameters are first calculated using a THD model. The effect of PTFE facing on bearing thermal performance is then presented and discussed. A TEHD model is subsequently employed. Obtained TEHD results show that oil film thickness and temperature are strongly affected by the PTFE layer. Theoretical results are compared with measured temperature, oil film thickness, and pressure.

TEHD Analysis of Thrust Bearings With PTFE-Faced Pads

2004 ◽  
Author(s):  
S. B. Glavatskih ◽  
Michel Fillon
Keyword(s):  
Experimental Investigation ◽  
Film Thickness ◽  
Thermal Performance ◽  
Power Loss ◽  
Measured Temperature ◽  
Oil Film ◽  
Thrust Bearings ◽  
Theoretical Results

Results of a combined theoretical and experimental investigation into the operation of thrust bearings with PTFE-faced pads are reported. Bearing performance is analysed in terms of temperature, power loss, oil film thickness and pressure. These parameters are first calculated using a THD model. The effect of PTFE facing on bearing thermal performance is then presented and discussed. A TEHD model is subsequently employed. Obtained TEHD results show that oil film thickness and temperature are strongly affected by the PTFE layer. Theoretical results are compared with measured temperature, oil film thickness and pressure.

Analysis of Tribological Performance of Piston Ring Lubrication

2011 ◽  
Author(s):  
Yibin Guo ◽  
Wanyou Li ◽  
Dequan Zou ◽  
Xiqun Lu ◽  
Tao He
Keyword(s):  
Film Thickness ◽  
Friction Force ◽  
Power Loss ◽  
Piston Ring ◽  
Design Parameters ◽  
Oil Film ◽  
Starved Lubrication ◽  
Piston Ring Lubrication ◽  
Cylinder Bore ◽  
Lubrication Conditions

In this paper a mixed lubrication model considering lubricant supply conditions on cylinder bore has been developed for the piston ring lubrication. The numerical procedures of both fully flooded and starved lubrication were included in the model. The lubrication equations and boundary conditions at the end of strokes were discussed in detail. The effects of piston ring design parameters, such as ring face profile and ring tension, on oil film thickness, friction force and power loss under fully flooded and starved lubrication conditions due to available lubricant supply on cylinder bore were studied. The simulation results show that the oil available in the inlet region of the oil film is important to the piston ring friction power loss. With different ring face crown heights and tensions, the changes of oil film thickness and friction force were apparent under fully flooded lubrication, but almost no changes were found under starved lubrication except at the end of a stroke. In addition, the oil film thickness and friction force were affected evidently by the ring face profile offsets under both fully flooded and starved lubrication conditions, and the offset towards the combustion chamber made a large contribution to forming thicker oil film during the expansion stroke. So under different lubricant supply conditions on the cylinder bore, the ring profile and tension need to be adjusted to reduce the friction and power loss. Moreover, the effects of lubricant viscosity, surface composite roughness, and engine operating speed on friction force and power loss were also discussed.

Study of Hybrid Lubrication at the Tooth Contact of a Wormgear Transmission: Part 2—Results and Discussion

1998 ◽  
Vol 120 (1) ◽  
pp. 112-118
Author(s):  
Qin Yuan ◽  
D. C. Sun ◽  
D. E. Brewe
Keyword(s):  
Temperature Distribution ◽  
Film Thickness ◽  
Numerical Solution ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Power Loss ◽  
Oil Film ◽  
Supply Pressure ◽  
Transmission Part

Part 2 begins by describing the numerical solution procedures of the hybrid lubrication problem. Results of the computation are then presented that include the detailed pressure and temperature distribution in the oil film, the required supply pressure for maintaining the prescribed minimum oil film thickness, the fluid friction acting on the worm coil surface, the mass flow rate of supply oil, and the power loss associated with the restrictor flow. The feasibility of the hydrostatically lubricated wormgear transmission is discussed in light of these results.

A Performance Investigation into the Elastically Stepped and Shrouded Thrust Bearing

1967 ◽  
Vol 182 (1) ◽  
pp. 769-782 ◽  
Author(s):  
E. W. Hemingway
Keyword(s):  
Experimental Investigation ◽  
Film Thickness ◽  
Thrust Bearing ◽  
Frictional Resistance ◽  
Oil Film ◽  
Elastic Deflection ◽  
Tilting Pad ◽  
Thrust Pad ◽  
A Performance

An experimental investigation is reported in which a stepped and shrouded thrust pad was formed from an initially plane pad face by elastic deflection caused by pressures generated hydrodynamically in the oil film. The pad shape was optimized experimentally and it produced thicker films than a comparable tilting pad bearing but with higher frictional resistance. Pressure and film thickness contours were investigated and plotted. A comparison is made with stepped pad bearing results. This paper is based on sections of a thesis presented in 1966 for the degree of Ph.D., University of London.

An Experimental Investigation of the Torque Efficiency in Small Supr Gears

2015 ◽  
Vol 642 ◽  
pp. 292-297
Author(s):  
Jian Shing Lee ◽  
Jeng Haur Horng ◽  
Ming Yuan Chiu
Keyword(s):  
Experimental Investigation ◽  
Film Thickness ◽  
Power Loss ◽  
Applied Load ◽  
Opposite Effect ◽  
High Viscosity ◽  
Oil Viscosity ◽  
Limited Effect ◽  
Gear Transmission System ◽  
High Viscosity Oil

In present study, a gear transmission system was used to evaluate the effects of oil viscosity, speed, oil temperature as well as the applied load on torque efficiency. The experimental results reveal that the efficiency is increased with the increasing oil temperature and/or applied load whether the multigrade or singlegrade oil was employed. Under a constant torgue, the power loss is increased with the increasing pitch line velocity. The above characteristic resulting from the use of high-viscosity oil yields the substantial variations. However, as the oil film thickness is quite small, the viscosity speed, oil temperature and applied load produces the limited effect on torque efficiency, It indicate that EP additives create an opposite effect on torque efficiency at poor lubrication.

Dynamic behaviour of elastic engine main bearings: Theory and measurements

2002 ◽  
Vol 216 (4) ◽  
pp. 179-194 ◽  
Author(s):  
H Moreau ◽  
P Maspeyrot ◽  
A. M. Chomat-Delalex ◽  
D Bonneau ◽  
J Frene
Keyword(s):  
Film Thickness ◽  
Theoretical Calculations ◽  
The Finite Element Method ◽  
Main Bearing ◽  
Oil Film ◽  
Calculation Results ◽  
Load Effects ◽  
Gap Sensors ◽  
Raphson Method ◽  
Theoretical Results

The design of crankshaft bearings is carried out with software using many assumptions on the geometrical and operating bearing parameters. The calculation results are thus more or less close to reality according to the assumptions used. In order to know the level of accuracy of the theoretical results, it is necessary to compare these results with those obtained by experimentation. This paper describes the experimental measurements and the theoretical calculations of oil-film thickness in a dynamically loaded crankshaft main bearing. Four eddy current gap sensors for each bearing are used to measure the oil-film thickness and to deduce the shaft trajectories. The elastohydrodynamic model considers the bearings, housing and crankshaft elastic deformations. The calculation process uses the finite element method and the Newton-Raphson method for the numerical analysis. Comparisons of the load effects and crankshaft speed are made between the experiment and the theory.

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