Motorcycle engine piston

Abstract

The invention discloses a piston for a motorcycle engine, which comprises a head section (1) and a skirt section (2), wherein a piston ring mounting groove (2e) is formed on the upper circumferential surface of the skirt section (2), and the lower circumferential surface of the skirt section (2) consists of two planes (2a) and two arc surfaces (2b) arranged at intervals; piston pin holes (2c) are symmetrically formed on the two planes (2a) on the lower section of the skirt section (2); the head section (1) has a planar top surface; and oil grooves (2d) are formed on the two arc surfaces (2b) on the lower section of the skirt section. The piston can ensure full combustion of mixed gas in the combustion chamber, and can properly reduce the compression ratio and the cylinder temperature, improve the piston performance and lower noise and abnormal sound of a heat engine on the head section of the cylinder. The oil grooves formed on the skirt section can enhance the oil storage function, reduce the friction between cylinders during the movement of the piston and prolong the service lives of the piston and the cylinders.

Description

technical field [0001] The invention belongs to the technical field of motorcycle engines, and in particular relates to a motorcycle engine piston. Background technique [0002] A common motorcycle engine piston is installed in the cylinder head and consists of a piston head and a piston skirt. Considering the shape of the piston head, its top surface is generally arched. There is a piston ring installation groove on the upper peripheral surface of the piston skirt, and the lower peripheral surface of the piston skirt is composed of two planes and two arcs set at intervals. Composed of planes, piston pin holes are symmetrically opened on the two planes. The piston pin passes through the piston pin hole, and the engine piston is mounted on the connecting rod. The top surface of the engine piston and the ball socket of the cylinder head form a closed combustion chamber. When the piston moves to the top dead center to compress the mixed gas in the combustion chamber, the spar...

AI Technical Summary

Problems solved by technology

Since the top surface of the piston is arched, when the airflow generated by the combustion of the mixed gas pushes the top surface of the piston, the direction of the airflow changes along the arch, which makes the thrust decompose and cannot act on the top of the piston better, resulting in the mixed gas in the combustion chamber. Insufficient combustion; if the combustion effect of the mixed gas is improved by increasing the compression ratio, the noise and abnormal sound of the cylinder head heat engine will be generated accordingly

In addition, the overall height of the engine piston is large, heavy, and high in cost; and when the piston reciprocates in the cylinder, there is a lack of lubrication between the outer wall of the piston and the cylinder, which causes serious wear and tear on the piston and cylinder, greatly reducing its service life

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