The Analysis of Secondary Motion and Lubrication Performance of Piston considering the Piston Skirt Profile

Table 2

Structure parameters of engine.

Symbol	Definition	Value
	Piston radius	55 mm
	Piston skirt length	82.8 mm
	Crankshaft radius	72 mm
	Connecting rod length	223 mm
	Connecting rod center-of-mass location	72 mm
	Piston center-of-mass location	10.8 mm
	Piston pin axial location	37.3 mm
	Piston mass	1.39 kg
	Piston inertia moment	0.003 kg·m^2
	Connecting rod mass	1.7 kg
	Connecting rod inertia moment	0.017 kg·m^2
	Crankshaft mass	23.5 kg
	Crankshaft moment of inertia	2 kg·m^2
	Crankshaft rotation speed	1680 rpm
	Theoretical piston skirt clearance	50 μm
	Piston surface roughness	0.20 μm
	External waviness root-mean-square value of piston	20 μm
	Inner hole surface roughness	0.50 μm
	Combined roughness	0.54 μm
	Modulus of elasticity (Al)	79 GPa
	Viscosity (100°, SAE 10W40)	0.0056 Pa·s
	Solid-solid friction coefficient	0.1
	Offset of crankshaft	0 mm
	Offset of pin	0 mm
	Offset of center of mass	0 mm
	Cylinder axial tilting angle	0°