Solenoid overhead airtight winding closed circulation cooling piston connecting rod group

Abstract

The invention discloses a solenoid abuts against closed circulation cooling piston connecting rod set. The connecting rod set comprises a piston body, a piston pin and a connecting rod, the top of thepiston body is provided with a pit, the outer wall of the pit is tightly wound with a hollow solenoid which is used for completely isolating the top of the piston body from high-temperature and high-pressure fuel gas in the cylinder, a solenoid oil passage is arranged in the solenoid, lubricating oil is arranged in the solenoid oil passage, two ends of the solenoid oil passage are respectively asolenoid oil inlet and a solenoid oil outlet, the lubricating oil can enter the solenoid oil passage through the solenoid oil inlet, and flows in the solenoid oil passage and flows out of the piston body through an oil outlet of the solenoid. The solenoid abuts against closed circulation cooling piston connecting rod set can isolate the top of the piston from high-temperature and high-pressure fuel gas in the cylinder, so that the piston can be ensured to obtain enough strength and stably and continuously cool when the internal combustion engine operates under a high-load working condition.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a solenoid top-mounted hermetic winding closed circulation cooling piston connecting rod group. Background technique [0002] At present, the strengthening degree of the reciprocating piston internal combustion engine is getting higher and higher with the technological progress, and the combustion pressure and combustion temperature of the working medium in the cylinder are also increasing. Under the influence of the environment, and the thermal load and mechanical load of the piston at high linear speed, how to provide sufficient strength and timely cooling for the piston becomes particularly important. [0003] Usually, an open lubricating oil cooling channel is provided in the inner cavity of the piston head, and an oil inlet connected to the inner cavity of the piston head is arranged at the bottom of the piston skirt near the piston pin seat, and is insta...

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Problems solved by technology

During the installation process, it is necessary to carry out a target shooting test on the spraying oil beam landing point of the lubricating oil nozzle, which prolongs the installation and running time of the engine. At the same time, the operation error of the target test will also cause a large difference in the cooling intensity of the pistons of each cylinder of the engine.

[0007] Second, when the piston runs to the top dead center of compression, the working fluid in the cylinder is compressed and then expands to do work. The heat released by the combustion of the working fluid directly acts on the piston. The temperature of the piston at the top dead center of compression is the highest, and it is most necessary At this time, the lubricating oil nozzle on the main oil passage is farthest from the piston, the oil beam sprayed by the lubricating oil nozzle has a linear maintenance performance decline, and the falling point of the oil beam will be deviated due to factors such as vibration and shock of the whole machine. In addition, the cooling channel in the inner cavity of the piston head is an open structure, so it is difficult for the oil entering to fill the entire cooling inner cavity, and the convective heat transfer capacity is insufficient, resulting in a decrease in the cooling capacity of the piston, especially when the internal combustion engine is working under a high load, the piston is easy to Failure faults associated with it due to high temperature

[0008] Third, the lubricating oil nozzle is installed on the small end of the connecting rod. The lubricating oil enters the lubricating oil nozzle through the groove provided on the bearing pad of the small end of the connecting rod. Because the cross section of the groove on the small end bearing pad cannot be set too large , the pressure of the amount of lubricating oil entering the lubricating oil nozzle will not be too large, and the lubricating oil cooling inner cavity channel under the piston head is an open structure, the lubricating oil entering is not enough to fill the cooling inner cavity, convection exchange The thermal effect is not good, especially when the internal combustion engine works under high load, the cooling capacity of the piston is not ideal, and there is a risk of high temperature failure of the piston

[0009] Fourth: Regardless of the scheme of spraying oil cooling on the piston skirt or the scheme of spraying oil cooling under the piston head, they are all open structures. After the lubricating oil is injected, it is difficult to fill the inner cavity and achieve complete convective heat exchange. , so the thermal deformation and melting of the piston head material are prone to occur under high load conditions

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