Abstract
The piston dynamic simulation was carried out for the wear of the piston skirt after the test of gasoline engine. In addition, the second motion and wear are studied for the improvement proposal of different cylinder clearances. Results show when the original cylinder clearance is 0.0325–0.0575 mm, the minimum operating clearance of the piston skirt is smaller; it is not good for the formation of lubrication oil film, which causes wear on the thrust side and anti-thrust side of piston skirt. When the cylinder clearance was increased to 0.0400–0.0650 mm, the wear load on the thrust side and anti-thrust side of piston skirt was reduced by 68.3% and 68.1%, respectively, the effect of improved wear is better and the result coincides well with engine test result.
Highlights
There are various factors influencing the mechanism of piston wear, such as piston-bore clearance, pin hole eccentricity, crankshaft eccentricity, center of mass of piston, piston deformation and design of shape line and so on [8–13]
Crankshaft eccentricity affects the relative swing of the skirt and the head at the moment of changing over during reciprocating movement of the piston; piston deformation usually influences the contact between the piston and the related parts once engine starts working; piston-bore clearance affects the amplitude of the second motion, and plays a key role in the friction and the wear between piston and cylinder [14–19]
According to the piston dynamics calculation, the initial clearance in case 1 is small resulting in a tiny oil film gap and a greater wear load
Summary
A piston of an internal combustion engine moves up and down inside the engine cylinder under the action of gas pressure, inertia force, side pressure and so on. There are various factors influencing the mechanism of piston wear, such as piston-bore clearance, pin hole eccentricity, crankshaft eccentricity, center of mass of piston, piston deformation and design of shape line and so on [8–13]. Crankshaft eccentricity affects the relative swing of the skirt and the head at the moment of changing over during reciprocating movement of the piston; piston deformation usually influences the contact between the piston and the related parts once engine starts working; piston-bore clearance affects the amplitude of the second motion, and plays a key role in the friction and the wear between piston and cylinder [14–19]. The piston test of gasoline engine was carried out and the wear condition of the skirt after the test was analyzed.
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