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Intensive-cooling steel piston of gas engine

A gas engine and steel piston technology, applied in the direction of engine components, machines/engines, pistons, etc., can solve the problem of large thermal load of the cylinder, achieve the effect of increasing the load limit, improving fatigue life, reducing thermal stress and thermal strain

Inactive Publication Date: 2014-11-19
HENAN DIESEL ENGINE IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of large heat load in the cylinder when the gas engine with high power density is fully loaded, the invention proposes a gas engine with strong cooling steel piston to improve the heat resistance of the gas engine

Method used

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  • Intensive-cooling steel piston of gas engine

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0013] Such as figure 1 , figure 2 As shown, a gas engine strong cooling steel piston includes a piston head 1 and a piston skirt 6, both of which are friction welded into one, and the material is made of heat-resistant, high-strength 42CrMo forged steel. The piston head 1 includes a combustion chamber 2, a piston ring groove 4, an outer cooling groove I3, an inner cooling groove I7 and an oil guide hole 5; the combustion chamber 2 is shallow basin-shaped and arranged on the piston head 1 The middle part of the end face; the piston ring groove 4 has three lines, which are arranged on the outer surface of the piston head 1; the outer cooling groove I3 surrounds the combustion chamber 2, the piston ring groove 4 and the inner cooling groove of the piston head Groove I7 is set; the inner cooling groove I7 is located in the middle of the lower end sur...

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Abstract

The invention belongs to the technical field of engines and relates to an intensive-cooling steel piston of a gas engine. The piston is made from heat-resisting and high-strength 42CrMo forged steel, an inblock aluminum piston casting mode in the prior art is replaced, the bearing extremity of the piston is improved, and the working reliability of the gas engine is further improved. A combustion chamber is designed to be in a shape of a shallow basin, the specified gas compression ratio can be obtained, and the working requirement of the gas engine is met. An area defined by the piston head portion and the skirt portion is structurally utilized to design an outer cooling cavity and an inner cooling cavity, the outer cooling cavity cools an outer circle of the piston head portion and the side wall of the combustion chamber, and the inner cooling cavity cools the bottom of the combustion chamber. By the adoption of the design, the problem that a single piston cooling cavity difficultly meets the using requirement due to large heat load is solved, heat stress and heat strain produced by the piston bearing high heat load are remarkably reduced, and the fatigue life of the piston is prolonged.

Description

technical field [0001] The invention belongs to the technical field of engines and relates to a strong cooling steel piston of a gas engine. Background technique [0002] The piston is one of the most important moving parts of the engine. Under the action of high temperature and high pressure gas, it continuously performs high-speed reciprocating motion, thus bearing the thermal load and mechanical load of high temperature and high pressure. The working conditions are very harsh, which requires the piston to have suitable Unique self-cooling system to effectively reduce the piston surface temperature. Gas engines usually use natural gas as the main fuel, the air-fuel ratio is small, the fuel combustion is insufficient, the heat load in the cylinder is larger than that of gasoline engines and diesel engines, and the piston surface temperature is higher. The temperature at the top of the piston has reached 400°C, which is close to the load-bearing limit of the aluminum piston...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F3/00F02F3/26F02F3/22
Inventor 王黎明陈松李国志李剑衡
Owner HENAN DIESEL ENGINE IND
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