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http://dx.doi.org/10.9725/kts.2020.36.3.168

Wear Analysis at the Interface of Connecting-Rod Small-End Bushing and Piston-Pin Boss with a Floating Piston-Pin at Constant Angular Velocity during Engine Firing  

Chun, Sang Myung (Major in Automotive Engineering, Faculty of Mechanical Engineering, College of Engineering, Hoseo University)
Publication Information
Tribology and Lubricants / v.36, no.3, 2020 , pp. 168-192 More about this Journal
Abstract
In recently designed diesel engines, the running conditions for piston-pin bearings have become severe because of the higher combustion pressure and increased temperature. Moreover, the metal removal from the bushing material has strongly reduced the ability of the antifriction material to accept asperity contacts. Therefore, it is necessary to find ways of reducing wear scar on the connecting-rod small-end bushing and piston-pin boss bearing related to the higher combustion pressure on the power cell of an engine. In this work, the position and level of material removal from the surfaces of the bushing and bearing under such severe operating conditions - for example, maximum power and torque conditions of a passenger car diesel engine - are estimated for several combinations of surface roughness. First, piston-pin rotating motion is investigated by calculating the friction coefficient at piston-pin bearings, the oil film thickness, and the frictional torques induced by hydrodynamic shear stress. Subsequently, the wear scarring on the surfaces of a connecting-rod small-end bushing and two piston-pin boss bearings related to piston-pin rotational motion is numerically calculated under the maximum power and torque operating conditions. This work is helpful to determine the reasonable surface roughness of the bushing and bearing for reducing wear volume occurring at the interface between a bearing and a shaft.
Keywords
most oil film thickness scarring wear; piston-pin of full floating type; rotating motion of piston-pin; piston-pin boss bearing; connecting-rod small-end bushing; engine firing condition of constant rpm;
Citations & Related Records
Times Cited By KSCI : 6  (Citation Analysis)
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