Numerical and Experimental Study on Lubrication Characteristics of Diesel Engine Piston Pin Hole

DENG Lijun; CHEN Li; MU Zhenqian; FU Qiang; XIONG Peiyou; LIU Jing; HUANG Aiqin

doi:10.3969/j.issn.1001-2222.2023.03.002

Vehicle Engine ›› 2023, Vol. 0 ›› Issue (3) : 8-16. DOI: 10.3969/j.issn.1001-2222.2023.03.002

Numerical and Experimental Study on Lubrication Characteristics of Diesel Engine Piston Pin Hole

DENG Lijun¹，CHEN Li²，MU Zhenqian，FU Qiang²，XIONG Peiyou²，LIU Jing¹，HUANG Aiqin¹

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Abstract

For piston groups with different pin inner diameters, fitting clearances and pin bore profiles, the multibody dynamics simulation was carried out based on the elastohydrodynamic lubrication model by using the temperature field and deformation of piston calculated through ANSYS as boundary conditions, and the wear condition of piston pin hole was analyzed by combining with pin hole fatigue test. The results show that the wear of pin hole generally occurs in the inner side of pin hole near the inner chamfer position. The structural strength of piston pin causes its own elliptical deformation to be too large, resulting in a large contact pressure on the surface of pin hole. Under the action of contact pressure, the pin hole will suffer from severe wear. With the increase of the inner hole diameter of piston pin, the cumulative wear load increases. The pin hole contact pressure and cumulative wear load decrease with the increase of fitting clearance. The hyperbolic pin hole profile is more conducive to the formation of the wedgeshaped dynamic lubricating oil film of pin hole.

Key words

diesel engine / piston pin / profile / dynamic analysis / contact pressure / wear

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DENG Lijun，CHEN Li，MU Zhenqian，FU Qiang，XIONG Peiyou，LIU Jing，HUANG Aiqin. Numerical and Experimental Study on Lubrication Characteristics of Diesel Engine Piston Pin Hole[J]. Vehicle Engine. 2023, 0(3): 8-16 https://doi.org/10.3969/j.issn.1001-2222.2023.03.002