Research Article
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·m2 | | Connecting rod mass | 1.7 kg | | Connecting rod inertia moment | 0.017 kg·m2 | | Crankshaft mass | 23.5 kg | | Crankshaft moment of inertia | 2 kg·m2 | | 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° |
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