Steel top piston for large-cylinder-diameter gas engine

Abstract

The invention discloses a steel top piston for a large-cylinder-diameter gas engine, relates to the technical field of gas engine pistons, and solves the technical problem of an all-aluminum or all-steel piston in the using process. The piston adopts a structure of a steel top and an iron skirt, an internal cooling oil cavity in the piston communicates with an oil return cavity through a pluralityof channels, an oil return hole used for communicating the oil return cavity and an inner cavity of a piston skirt is arranged at the top end of the piston skirt, and the height of an orifice of theoil return hole is higher than the bottom surface of the oil return cavity and the bottom surfaces of the channels; a sunken combustion chamber is arranged at the top end of a piston head, and a bulgeis arranged in the combustion chamber; and the piston head is connected with the piston skirt through a connecting assembly. The steel top piston for the large-cylinder-diameter gas engine is high inreliability and lower in cost in comparison with the all-steel piston, good heat exchange performance inside the piston is ensured, the reliability of the piston and the combustion efficiency of fuelgas are improved, the squish speed of mixed gas is further improved, the combustion speed is accelerated, the stagnation period is shortened, and more perfect combustion is ensured.

Description

technical field [0001] The present invention relates to a gas engine piston, more specifically, it relates to a steel top piston for a gas engine with a large bore. Background technique [0002] The adaptability of gas source, high reliability, high power density and thermal efficiency are the main indicators that users pay attention to for gas engines. When the gas engine is applied to high calorific value gas, it often adopts high boost ratio technology, intercooling technology, Miller cycle, high energy ignition technology and other means to ensure higher reliability and high power density by increasing the explosion pressure in the cylinder and thermal efficiency. In this case, the traditional aluminum piston has been difficult to meet the requirements of high burst pressure, high temperature resistance and high reliability. It is mainly reflected in: [0003] (1) As the explosion pressure in the combustion chamber continues to increase, especially when a higher compr...

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Problems solved by technology

[0003] (1) As the explosion pressure in the combustion chamber continues to increase, especially when a higher compression ratio is selected, the traditional aluminum piston is difficult to withstand the impact of the explosion pressure, which may easily lead to cracking failure;

[0004] (2) As the temperature in the combustion chamber rises, the traditional aluminum piston is prone to failure of piston melting top, which will cause damage to the engine and make it difficult to meet the requirements

[0006] 200mm), the use of all-steel pistons often faces a series of problems such as high mold costs, difficult welding process of the oil passage and inner cavity of the piston head, and large overall weight of the piston.

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