Piston production line: What is the structure of the piston?
Published Time:
2020-12-31
Pistons in the piston production line are generally cylindrical. According to different working standards and requirements of diesel engines, the structure of pistons themselves varies. Generally, this small component is divided into three parts: the top, the shank, and the piston pin seat.
Piston Production Line Pistons are generally cylindrical. According to different engine operating standards and requirements, the structure of the piston itself varies. Generally, this small component is divided into three parts: the top, the skirt, and the piston pin boss. The top refers to the piston crown and pin area.
Piston Production Line The piston crown depends on the engine combustion chamber requirements. A sloped or near-sloped design helps reduce the contact area between the piston and high-temperature gases, ensuring even stress distribution. Most gasoline engines use sloped pistons. Some diesel engines, to meet the needs of air-fuel mixing and improve combustion efficiency while minimizing detonation, require the piston crown to have a more complex shape, with a certain depth of recess serving as part of the combustion chamber.
Piston Production Line The recess in the piston is called the piston pin boss and is used for installing piston rings. The function of the piston rings is to seal, prevent gas leakage, and prevent oil from entering the combustion chamber. The piston skirt is the lower part of the piston; its function is to maintain the vertical movement of the piston during repeated motion, which is the guiding part of the piston.
Piston Production Line The shape of the piston skirt is crucial, especially in light vehicles such as cars. Designers, considering the structure and characteristics of the engine, often make adjustments to the piston skirt to ensure compact structure and stable operation of the engine.
Piston Production Line The piston pin boss is the supporting part that connects the piston to the connecting rod via the piston pin, located above the piston skirt. A unique feature of high-speed engine piston pin bosses is that the pin bore is not necessarily on the same centerline plane as the piston; it can be offset slightly to one side.
Piston Production Line This offset, towards the side where the piston contacts the cylinder wall during the power stroke, reduces the impact of the piston against the cylinder wall when the piston changes direction at the bottom dead center, thus reducing engine noise.
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