Assessment of Shaft Surface Structures on the Tribological Behavior of Journal Bearings by Physical and Virtual Simulation (original) (raw)

Three-dimensional thermohydrodynamic investigation on the micro-groove textures in the main bearing of internal combustion engine for tribological performances

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2020

A three-dimensional thermohydrodynamic numerical simulation study was used to investigate the impact of the micro-groove surface texturing on the tribological performances in the main bearing of the internal combustion engine. For this purpose, various number of grooves and groove height to the bearing surface were applied to determine the optimal texture surface parameters by comparing the load-carrying capacity and friction force in the engine main bearing. In the multiphysics numerical model, the three-dimensional Navier–Stokes equation was employed considering the cavitation mechanism based on the Elrod method in the solution. Using the transverse grooves on the bearing surface altered the cavitation response and film reformation. To validate the use of the current numerical model for analyzing the bearings, the obtained results were compared with those of the published theoretical papers, where a good agreement was obtained. The bearing performance was studied in thermal interf...

Investigation of Tribological Behaviour of Journal Bearings for Different Conditions : A Review

SSRN Electronic Journal, 2018

In high speed applications like pumps, turbines, turbocharger journal bearing serviceability is very important one. The journal bearing acting as a support for high rotary speeds as well as acting as a damping element so as to absorb the vibrations at high speeds. In hydrodynamic region if failure of lubrication or starved lubrication is occurred it responsible for tremendous amount of friction between the shaft and bearing with high wear loss causing damage to the surfaces of the component. So it focuses that use of sintered composites for journal bearing applications is suitable for reduced frictional wear. However experimental analysis is required for sintered composites at high speed with starved or dry conditions of lubrication. The combine effect of parameters has to be studied for tribological behaviour of sintered journal bearings. It includes surface quality, alloying material compositions, porosity of sintered bearings, geometrical aspects and external conditions like applied loads, speed transitions, temperature, lubricating conditions etc. With reference to said subject thorough literature review was carried out. It provides very valuable information regarding parametric analysis and its effect on friction and wear of bearings in different situations of temperature, load, speeds etc

Investigation of tribological and mechanical properties of metal bearings

Bulletin of Materials Science, 2009

Copper, aluminum and tin-lead based alloys are widely used as journal bearing materials in tribological applications. Bronze and brass are widely used as journal bearing materials for copper based alloys. Zamacs find applications as journal bearing materials for zinc based alloys, while duralumines are chosen as journal bearing materials for aluminum based alloys. In addition, white metals are widely used as journal bearing materials for tin-lead based alloys. These alloys ensure properties expected from journal bearings. In this study, tribological and mechanical properties of these journal bearings manufactured by metals were investigated. SAE 1050 steel shaft was used as counter abrader. Experiments were carried out in every 30 min for a total of 150 min by using radial journal bearing wear test rig.

Optimizing the Piston/Bore Tribology: The Role of Surface Specifications, Ring Pack, and Lubricant

SAE Technical Paper Series, 2020

he present study looks into different possibilities for tribological optimization of the piston/bore system in heavy duty diesel engines. Both component rig tests and numerical simulations are used to understand the roles of surface specifications, ring pack, and lubricant in the piston/bore tribology. Run-in dynamics, friction, wear and combustion chamber sealing are considered. The performance of cylinder liners produced using a conventional plateau honing technology and a novel mechanochemical surface finishing process-ANS Triboconditioning ®-is compared and the importance of in-design "pairing" of low-viscosity motor oils with the ring pack and the cylinder bore characteristics in order to achieve maximum improvement in fuel economy without sacrificing the endurance highlighted. A special emphasis is made on studying morphological changes in the cylinder bore surface during the honing, run-in and Triboconditioning ® processes. It is demonstrated that the Triboconditioning ® treatment, while in certain aspects resembling the run-in process, provides a greater effect depth and results in a beneficial tribological performance profile. In particular, the Triboconditioning ® treatment of cylinder liners allows significant reduction in top ring wear when low viscosity motor oil is used for improved energy efficiency.

The Behavior of Tribological Characteristics of Diesel Crank-Shaft Bearing

World Tribology Congress III, Volume 2, 2005

In this paper, the various methods of wear and lubrication calculation for crankshaft sliding bearing are presented basing on the solution of dynamic problem for hydrodynamic equation of lubrication and wear. The concrete parameters as lubricant film thickness, eccentricity, pressure and velocity distribution, friction coefficient and wear intensity are determined. The proposals of concrete parameters of bearing are discussed.

The testing of the influence of the roughness of the crankshaft journal upon the durability of the crankshaft bearing in engines of agricultural machines

Scientific Problems of Machines Operation and Maintenance, 2010

In the process of the operation of agricultural tractors and harvesters, it is necessary to perform periodical technical service related to the repair of the crankshaft bearings in Diesel engines. The solutions applied in machine finishing of crankshaft journals regenerated by grinding, make it necessary to run the same in operation, which results from the fact that working surfaces are not suitable for the conditions of use. Therefore, testing was initiated in order to establish whether the roughness of working surfaces of crankshaft journals obtained as a result of the repairs may have a considerable influence upon the limitation of durability of the journalbushing sliding joint. Wear tests were performed in the model arrangement constituting material representation and, in the case of crankshaft journals, also the geometrical representation of real parts. The wear tests were performed for established sliding and load values with the assumption

Development of a test method for a realistic, single parameter-dependent analysis of piston ring versus cylinder liner contacts with a rotational tribometer

Tribology International, 2017

A rotational tribometer as well as a corresponding test method for measuring friction and wear under pure sliding conditions were developed for the purpose of single parameter analysis of piston ring to cylinder liner contacts. Using this rotational tribometer and applying the developed test method, such analyses were carried out at a high level of precision and under close-to-engine conditions within a wide range of relevant operation parameters of internal combustion engines. In order to validate the test method, the friction and wear of a compression piston ring running against a honed cylinder liner were studied. In this paper, the influence of the test parameters contact temperature, ring load, test duration and sliding speed on the friction and wear behavior of a hard chrome-plated piston ring against a thermally sprayed, iron-based cylinder liner coating (NANOSLIDE ®) was analyzed. The friction and wear study at low, medium and high combustion chamber pressures, low to high sliding speeds as well as at moderate to high contact temperatures will be discussed exemplarily. The obtained wear results show very good correlation to engine durability tests.

TRIBOLOGICAL PROPERTIES OF PISTON‐CYLINDER SET IN INTERNAL COMBUSTION ENGINES

This paper presents a wear process analysis of piston‐cylinder set in internal combustion engines.Piston mechanism is a very important factor in the proper lubrication of the engine, but also a potential cause of increased consumption of oil. There are very important kinematic ‐ tribological properties of piston mechanisms in this regard. From the point of reliability and functionality, critical parts of this circuit are the piston rings. Wear is most pronounced in the first piston ring, since it is exposed to the highest pressure and temperature, as well as the direct impact of fuel and combustion products. The intensity of wear of piston ‐ cylinder set depends on many factors, but the most influential ones are: construction, materials used for the production of the parts of this assembly, production technology and conditions of use.

EXPERIMENTAL STUDY ON TRIBOLOGICAL CHARACTERISTICS OF CYLINDER LINER AND PISTON RING USING RESPONSE SURFACE METHODOLOGY

The tribological behavior of piston rings has long been recognized as an important influence on the performance of internal combustion engines in terms of power loss, fuel consumption, oil consumption and harmful exhaust emissions. Hence, the aim of this project work is to study the tribological characteristics of cylinder liner (CL), piston ring (PR) pair. Reciprocating wear process parameters are optimized for minimum weight loss and friction based on Box-Behnken design with three process parameters, speed, load, and oil type. Response surface methodology (RSM) was used to analyze the experimental results. The experimental results are in good agreement with the values from the theoretical model. Keywords: Cylinder liner, Piston ring, RSM.