Introducing a New Piston Skirt Profile to Reduce Engine Friction

Totaro, Pasquale; Westerfield, Zachary; Tian, Tian

doi:10.4271/2016-01-1046

Cited by 17 publications

(3 citation statements)

References 10 publications

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“…Therefore, rationalizing the design of the cylinder bore pattern, reducing the friction power and the peak knocking kinetic energy of the PRCB system, is of great significance to improving the economy and NVH performance of diesel engines. Most scholars have chosen to optimize the piston structure [10][11][12] and rationally design the surface texture of the friction pair [13][14][15] to reduce the friction loss and the knocking kinetic energy of the PRCB. Few scholars have improved the friction and lubrication characteristics and knocking characteristics of the PRCB system by rationally designing the macrostructure of the cylinder bore.…”

Section: Introductionmentioning

confidence: 99%

Low-Friction and -Knocking Diesel Engine Cylindrical-Tapered Bore Profile Design

Zhang,

Wang,

Wang

et al. 2024

Energies

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To reduce the friction loss and the piston-knocking noise from the perspective of the design of the cylinder bore profile, the piston-ring cylinder bore (PRCB) dynamic model of an L6 diesel engine was developed using AVL-Excite-Piston & Rings. Based on the full-scale test method, the effects of bore taper, starting height of tapered profile, and ellipticity on the friction power and knocking energy of the PRCB system were investigated, and the optimization of the design of the bore profile was carried out with the objectives of minimizing the system’s friction power and the peak knocking kinetic energy. The results showed that the taper of the cylinder bore has the greatest influence on the system’s friction power and the peak knocking kinetic energy, followed by the starting height of the conical profile. For the peak knocking kinetic energy of the piston, there was an obvious interaction between the taper and the starting height of the conical profile. When the taper was 35 μm and 45 μm, the peak knocking kinetic energy showed a decreasing and then increasing trend with the increase in the starting height of the profile, and when the taper was 55 μm the peak knocking kinetic energy monotonically was decreased with the increase in the starting height of the conical profile. The optimization results showed that the system’s friction power was decreased by 15.05% and the peak knocking kinetic energy was decreased by 21.41% for a taper degree of 55 μm, a tapered profile starting height of 31 mm, and an ellipticity of 50 μm compared to the initial cylindrical cylinder bore.

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Section: Introductionmentioning

confidence: 99%

Low-Friction and -Knocking Diesel Engine Cylindrical-Tapered Bore Profile Design

Zhang,

Wang,

Wang

et al. 2024

Energies

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“…13 Some other attempts aimed to enhance the performance of ICE by making advantageous geometrical modifications over the conventional engine mechanism. This included adding a crankshaft offset in order to decrease the piston friction 14,15 or developing an improved piston skirt profile, 16 and increasing the torque output by adding an eccentric connector to the crank. 17 Another attempt tried combining the use of a high stroke-to-bore ratio, high compression ratio, and increased exhaust gas recirculation (EGR) rate for improving the engine’s brake thermal efficiency.…”

Section: Introductionmentioning

confidence: 99%

Performance study of the hypocycloid gear mechanism for internal combustion engine applications

ElBahloul

Aziz

Chassapis

2019

International Journal of Engine Research

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Fuel conversion efficiency is one of the main concerns in the field of internal combustion engine systems. Although the Otto cycle delivers the maximum efficiency possible in theory, the kinematics of the slider–crank mechanism of the conventional internal combustion engines makes it difficult to reach this level of efficiency in practice. This study proposes using the unique hypocycloid gear mechanism instead of the conventional slider–crank mechanism for the internal combustion engines to increase engine efficiency and minimize frictional power losses. The hypocycloid gear mechanism engine’s kinematics provides the means for the piston-rod assembly to reciprocate in a straight-line motion along the cylinder axis besides achieving a nonlinear rate of piston movement. As a result, this characteristic allows for a true constant-volume combustion, which in turn would lead to higher work output. An in-cylinder gas volume change model of the hypocycloid gear mechanism engine was developed and incorporated into the thermodynamic model for the internal combustion engine cycle. The thermodynamic model of the hypocycloid gear mechanism engine was developed and simulated using MATLAB/Simulink software. A comparison between the conventional engine and the hypocycloid gear mechanism engine in terms of engine performance characteristics showed the enhancements achieved using hypocycloid gear mechanism for internal combustion engine applications. The hypocycloid gear mechanism engine analysis results indicated higher engine efficiency approaching that of the Otto cycle.

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“…FEM piston thermal and mechanical analysis gives rise to an extensive number of studies [1][2][3][4][5][6][7][8][9]. Hence, many researchers studied this phenomenon focused on the FE analysis of strains/stresses by advanced numerical methods [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Study of Piston Thermo-Elastic Behaviour under Thermomechanical Solicitations

Mechalikh¹,

Benhamou²,

Zidane³

et al. 2019

IJAME

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The piston material choice is a major factor in the design stages of internal combustion engines for its importance to improving the durability and the operation reliability during the piston life cycle. Indeed, even as many researches have been conducted for a long time to improve the piston performances in the diesel engine, considerable numbers of piston damages still significantly occur. This research work is an assessment by the finite element method (FEM) of a set of piston materials for the purpose of being used in a direct injection diesel engine. The main objective is to predict stresses concentrations and the clearance between the piston and the cylinder (to avoid metal-metal adhesion) from thermomechanical solicitations. The stresses and deformations are evaluated in a 3D piston model by using ABAQUS software. A first assessment step is performed in heat convection/conduction modes to determine the temperature distribution. Then, this last one is coupled to the pressure field resulting from the gas combustion in order to compute stresses and the magnitude displacement. The obtained results show that the austenitic steel AS12UNG with fibre-reinforced possess low thermomechanical stress values compared to other material types. This material allows a minimum failure risk and therefore contributes to the enhancement of the piston design.

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Introducing a New Piston Skirt Profile to Reduce Engine Friction

Cited by 17 publications

References 10 publications

Low-Friction and -Knocking Diesel Engine Cylindrical-Tapered Bore Profile Design

Low-Friction and -Knocking Diesel Engine Cylindrical-Tapered Bore Profile Design

Performance study of the hypocycloid gear mechanism for internal combustion engine applications

Study of Piston Thermo-Elastic Behaviour under Thermomechanical Solicitations

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