Forged steel piston

Abstract

The invention provides a novel steel forging piston. The novel steel forging piston comprises a piston head, a piston skirt and a piston pin boss which are arranged in a cooperative mode, and furthercomprises a grid mesh structure, a piston ring groove and a combustion chamber. The grid mesh structure is arranged on the lower portion of the piston head to constitute the piston skirt; the piston ring groove is formed in the outer side face of the piston head in a sleeving mode; and the combustion chamber is formed in an inward groove of the piston head. Through the technical scheme, the weightof the piston is lowered, the heat dissipation area is increased, the cooling effect is enhanced, the contact area between the piston skirt and a cylinder sleeve is decreased more effectively, and the friction loss is effectively lowered.

Description

technical field [0001] The invention relates to the technical field of pistons, in particular to a forged steel piston. Background technique [0002] With the development of the engine, the mechanical load and thermal load on the engine piston are getting higher and higher. The light weight, low friction of the engine and the strength of the parts are highly valued by the company. Steel pistons are widely used because of their high strength, small thermal expansion, and low noise. How to reduce the weight of steel pistons, reduce piston friction, and reduce piston operating temperature has become an urgent problem to be solved. [0003] In the related technology, the internal cooling oil cavity is usually formed on the top of the piston or the traditional cooling oil cavity is formed by laser welding or friction welding, and the working temperature of the piston is reduced by forced oil spray cooling with engine oil, which has the following technical defects: [0004] (1) A...

AI Technical Summary

Problems solved by technology

[0004] (1) Although the steel piston has high strength, it is heavy

[0005] (2) The processing technology of the cooling oil cavity is poor, the processing is difficult, the efficiency is low, and the cost is high

[0006] (3) The cooling method of the inner cooling oil chamber mainly depends on the high-pressure engine oil being sprayed from the cooling nozzle installed on the cylinder block, and sprayed into the inlet of the inner cooling oil chamber at the bottom dead center of the piston, because the nozzle and the inner cooling oil chamber are not closed and connected , the oil intake efficiency is not high

[0007] (4) The welded steel piston is easy to form flash at the welded part, which blocks the inner cooling oil chamber. If the temperature at the top of the inner cooling oil chamber is too high, it will cause coking of the engine oil. The accumulation of coking for a long time will easily block the inner cooling oil chamber and cause cooling. Failure, which further causes the temperature of the top of the piston to rise, resulting in cracking and failure of the piston

Images