Abstract
This paper takes dynamics analysis on the piston and the dynamic lubrication theory on the skirt and the ring of piston as the basis. Using AVL Glide software, through the establishment of the analysis model of the piston secondary movements, this study focuses on the effects of the crankshaft bias on piston secondary movements’ characteristics. This paper takes 5 different offsets, by comparing the piston lateral displacement, transverse movement speed, transverse acceleration, swinging angle, swing angular velocity and angular acceleration, finds out the relationships between crank offset value and the piston “slap”, piston impact energy and piston skirt friction loss, thus, provides the basis for the design of internal combustion engines.
Highlights
The piston secondary movements are some small movements exist in the processes of the reciprocating work of internal combustion engines
Piston secondary movements are the basis of the study of behavior of piston modules’ friction loss, and for internal combustion engines, they have important influences on the friction loss of piston skirt [3]
Crankshaft offset -14.5 mm can significantly reduce the maximum piston impact energy, reduce about 44.7% compared to the crankshaft zero biased, but the piston skirt friction loss is greater than zero biased crank: it has increased by about 17.5%
Summary
The piston secondary movements are some small movements exist in the processes of the reciprocating work of internal combustion engines. They refer to, under the pressure of the gas deflagration, inertia force, the connecting rod force, friction force and oil film, except for linear motion (first order motion), there still exists lateral movements and the swing motions around the piston pin [1]. The piston secondary movements have effects on the performances, working reliability and the service life of the internal combustion engines, and other aspects of influences can not be ignored.
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