Calculation of the required minimum of a motor oil level on cylinder-piston group moving surfaces of the automotive diesel

Abstract

BACKGROUND: Theme of this article is actual because issues of the reliable and cost-effective opera-tion of augmented automotive piston engines are still not solved. An important aspect of solving the problem is rational oil supply of the cylinder-piston group.

AIMS: The purpose of this work is the required minimum motor oil level estimation for the hydrodynamic lubrication of the “cylinder-piston skirt” pair. There were set and solved the tasks of determining the volume of motor oil capable of filling: 1) cavities of the flat-topped surface of the cylinder; 2) a raised surface of the piston skirt and 3) the piston skirt clearance. The object of study is an automotive diesel.

METHODS: Three types of analytical determination of the total volume of the cavities of the rough surface and the piston skirt clearance were used as methods for estimation of a motor oil level.

RESULTS: It was found, that the estimation with the well known formula for oil volume (a method 1) gives the overevaluated result of oil level estimation, in comparison with methods 2 and 3, which taking into account the real geometry of cavities and roughness parameters. The advantage of method 3 was determened by criteria of generalization and of simplicity to apply. Using the method 3, the estimated volume of motor oil ensured the hydrodynamic lubrication mode of the “cylinder – piston skirt” pair of the object of study was obtained.

CONCLUSION: The analytical expressions obtained by method 3 can be recommended to optimize the piston engine lubrication systems for reducing the friction and wear losses as well as to minimize a risk of oil starvation and increased oil consumption through burning.

Keywords

diesel / motor oil / roughness / surface / cylinder / piston skirt

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RIGHTS & PERMISSIONS

Putintsev S.V., Anikin S.A., Demenkova S.P., Strelnikova S.S.