Engine piston

Abstract

The invention discloses an engine piston. The engine piston comprises a piston body, wherein an annular clamping groove which is formed in the circumferential direction of the piston body is formed in the outer side wall of a head of the piston body; the depth direction of the annular clamping groove is consistent with the radial direction of the piston body; a sealing ring for sealing an opening of the annular clamping groove is fixedly inlaid at an opening of the annular clamping groove; the inner space of the annular clamping groove of which the opening is sealed by the sealing ring forms a piston coolant passage; and piston ring grooves formed in the circumferential direction of the sealing ring are formed in the outer side wall of the sealing ring. According to the engine piston disclosed by the invention, the processing difficulty of a piston coolant reservoir is effectively reduced, the long-time stable operation of the piston is guaranteed, the sealing performance of the piston is improved, and the service life of the piston is prolonged.

Description

technical field [0001] The invention relates to a piston, in particular to an engine piston, and belongs to the technical field of pistons. Background technique [0002] The role of the piston is to withstand the pressure of the combustion gas and transmit it to the connecting rod through the piston pin to drive the crankshaft to rotate. In recent years, due to the continuous improvement of the engine's strengthening degree and the increasingly stringent emission requirements, the piston, as the core component of the engine, has endured higher heat Load and mechanical load, therefore, the requirements for the structure and material of the piston are now more stringent. [0003] More and more domestic enterprises have begun to develop steel pistons. Steel pistons are a kind of pistons that use steel instead of aluminum. They have good strength. At present, most steel pistons adopt integral or two-stage structures. The steel piston machining process of the structure is very d...

AI Technical Summary

Problems solved by technology

[0003] More and more domestic enterprises have begun to develop steel pistons. Steel pistons are a kind of pistons that use steel instead of aluminum. They have good strength. At present, most steel pistons adopt integral or two-stage structures. The steel piston machining process of the structure is very difficult, especially when machining the piston coolant groove, it is very complicated. Moreover, in the prior art, there is a kind of piston that has a circumferential annular counterbore on the piston body, and the annular counterbore The inner fixation is inlaid with an inlay sleeve, and an annular groove arranged in the circumferential direction is opened on the outer wall of the inlay sleeve, and then a piston ring is arranged in the annular groove; the piston of this structure is affected by the reciprocating axial movement of the piston during the long-term working process. Influenced by the pulling force and shearing force, the insert fixed in the annular counterbore is easy to loosen and fall off, which affects the sealing performance of the piston, and in severe cases, the piston cannot work normally and becomes invalid, shortening the service life of the piston

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