A piston with two-in-one-out reverse circulation cooling oil cavity and preparation method thereof

Abstract

The invention discloses a piston with a two-in-one-out reverse circulating cooling oil cavity and a manufacturing method thereof. The piston comprises the annular cooling oil cavity, a first oil inlet hole, a second oil inlet hole and an oil outlet hole, wherein the annular cooling oil cavity is located in the head of the piston, the first oil inlet hole and the second oil inlet hole are formed in the same side of the piston, and the oil outlet hole is formed opposite to the first oil inlet hole and the second oil inlet hole. A stopper used for changing the flowing direction of cooling oil is arranged at the position, between the first oil inlet hole and the second oil inlet hole, of the annular cooling oil cavity. The first oil inlet hole, the second oil inlet hole and the oil outlet hole are communicated with the annular cooling oil cavity. The inblock cast aluminum piston with the two oil inlet holes, one oil outlet hole and the reverse circulating cooling oil cavity is matched with a cooling oil nozzle, arranged obliquely, of an engine, the filling amount of the cooling oil in the oil cavity can be effectively increased, the working temperature of the piston head can be obviously lowered, faults such as scuffing and cracking of the piston caused by overlarge heat loads are prevented, and working reliability of the engine is ensured.

Description

Technical field [0001] The invention relates to the technical field of internal combustion engine pistons, in particular to a piston with two-in and one-out reverse circulation cooling oil cavity and a preparation method thereof. Background technique [0002] With the advancement of internal combustion engine technology and the continuous upgrade of emission levels, medium and heavy-duty engines have been developing in the direction of high power density and high explosion pressure, and engine operating temperatures have continued to increase. As the core component of the engine, the piston bears higher and higher thermal load. The thermal load is one of the most important factors causing piston failure. Reducing the working heat load of pistons has become a key concern of R&D personnel in the internal combustion engine industry in recent years. The oscillating circulation structure of the ordinary cooling oil cavity of the original conventional aluminum alloy piston is matched...

AI Technical Summary

Problems solved by technology

The ordinary cooling oil chamber oscillating cycle structure of the original conventional aluminum alloy piston cooperates with the vertically upward cooling nozzle of the engine. Due to the serious oil injection reflection, the cooling oil inlet efficiency is low, and the oil filling of the internal cooling oil chamber is insufficient, resulting in the piston Difficult to withstand higher heat load, unable to meet the requirements of high power, high reinforcement and low emission of the engine

There is also a structure in which the open oil inlet hole is used for one-way circulation in the internal cooling oil chamber, and the overall aluminum piston is matched with the inclined cooling nozzle of the engine. The piston technology is relatively simple, but when the open cooling oil chamber is matched with the inclined cooling nozzle , in order to ensure a long enough oil inlet time and a sufficient amount of oil inlet, it is necessary to design the opening of the open oil inlet hole to be very long. , will also affect the oil inlet efficiency, the length of the opening and the refractive index of the injection oil are mutually restricted, and it is difficult to ensure the filling of the oil in the cooling oil chamber

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