Internal combustion engine piston device capable of discharging combustion chamber exhaust gas to the outside

Abstract

An internal combustion engine piston device capable of discharging combustion chamber exhaust gas to the outside comprises an internal combustion engine cylinder, a gas inlet valve and a gas vent valve which are arranged on the top of the cylinder and a main piston arranged in the cylinder, wherein the upper part of the main piston is provided with a cavity, a small piston is arranged in the cavity and can slide up and down in the cavity; a upper retainer ring and a lower retainer ring are separately fixed on the upper end and lower end of the cavity, a compression spring is arranged between the bottom of the small piston and the lower retainer ring; the middle of the lower retainer ring is provided with an arched barrier strip, and an anti-rotating card used for preventing the rotation of the small piston is arranged between the arched barrier strip and the bottom of the small piston. In the piston device of the invention, the small piston is arranged on the upper part of the main piston, and the small piston contacts with the upper retainer ring in the tail section of exhaust stroke under the action of the force of the compression spring and the self inertia force so as to compress the combustion chamber to the minimum volume and drain the exhaust gas in the combustion chamber, thus increasing the efficiency of the combustion chamber. The piston device has simple and reasonable structure, convenient assembly and reliable operation.

Description

technical field [0001] The invention relates to a reciprocating piston fuel internal combustion engine, in particular to a piston device of the internal combustion engine which can discharge exhaust gas from a combustion chamber. Background technique [0002] In the existing internal combustion engine, because the combustion chamber occupies a certain volume, when the exhaust is finished, high-temperature residual gas equivalent to the volume of the combustion chamber will be left in the cylinder and cannot be discharged outside. Due to the existence of high-temperature residual gas, the mixing at the end of the intake Air temperature is higher. Reducing the high-temperature residual gas volume in the cylinder at the end of the exhaust is generally recognized as a way to improve engine efficiency. Contents of the invention [0003] The object of the present invention is to provide a piston device for an internal combustion engine with simple and reasonable structure, high...

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Problems solved by technology

[0002] In the existing internal combustion engine, because the combustion chamber occupies a certain volume, when the exhaust is finished, high-temperature residual gas equivalent to the volume of the combustion chamber will be left in the cylinder and cannot be discharged outside. Due to the existence of high-temperature residual gas, the mixing at the end of the intake higher air temperature

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