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Improving the Engine Lubrication and Friction with Spherical Dimples of Partial Textures Optimized on Crankpin Bearing Surface
- Dengke Ni - Hubei Polytechnic University, School of Mechanical and Electrical Engineering, China Hubei Polytechnic University, Hubei Key Laboratory of Intelligent Conveying Technology and Device, China ,
- Vanliem Nguyen - Hubei Polytechnic University, School of Mechanical and Electrical Engineering, China Hubei Polytechnic University, Hubei Key Laboratory of Intelligent Conveying Technology and Device, China ,
- Huan Yuan - Hubei Polytechnic University, School of Mechanical and Electrical Engineering, China Hubei Polytechnic University, Hubei Key Laboratory of Intelligent Conveying Technology and Device, China
Journal Article
04-15-03-0013
ISSN: 1946-3952, e-ISSN: 1946-3960
Sector:
Topic:
Citation:
Ni, D., Nguyen, V., and Yuan, H., "Improving the Engine Lubrication and Friction with Spherical Dimples of Partial Textures Optimized on Crankpin Bearing Surface," SAE Int. J. Fuels Lubr. 15(3):265-275, 2022, https://doi.org/10.4271/04-15-03-0013.
Language:
English
Abstract:
A new approach of the crankpin bearing (CB) surface designed by different partial
textures (PTs) with spherical dimples (SDs), conical dimples (CDs), or
circular-cylindrical dimples (CCDs) is proposed to enhance the lubrication
performance and reduce the friction power loss of engines. To assess the effect
of the geometric dimensions of different PTs, such as the distribution density,
depth, and shape of dimples on the lubrication performance and friction power
loss (LP-FPL), a hydrodynamic model of the engine’s CB lubrication is then
built. Then a genetic algorithm (GA) developed in MATLAB software is applied for
optimizing the geometric dimensions of the PTs to further improve the LP-FPL.
Both the oil film pressure and friction force of the CB are chosen as the
objective functions to evaluate the LP-FPL of engines. The obtained results show
that the LP-FPL of engines with the CB surface designed by PTs at the mixed
lubrication regime is significantly improved in comparison with the CB surface
designed by full textures. In addition, the PTs designed by the SDs with a
distribution density of n = 4 and m = 6 in the
x and y directions of the bearing surface
improve the LP-FPL better than other structures of conical dimples
(n = 4 and m = 6) [CDs(4 × 6)],
circular-cylindrical dimples (n = 4 and m = 6)
[CCDs(4 × 6)], spherical dimples (n = 3 and m
= 6) [SDs(3 × 6)], and spherical dimples (n = 5 and
m = 6) [SDs(5 × 6)]. Particularly, at an engine speed of
2000 revolutions per minute (rpm), the maximum values of the oil film pressure
and friction force with the spherical dimples (n = 4 and
m = 6) [SDs(4 × 6)] optimized by the GA are remarkably
improved by 7.2% and 22.7% in comparison with full textures. Therefore, the use
of the optimal SDs(4 × 6) could further enhance the LP-FPL of engines.