Work-increasing piston type four-stroke internal combustion engine

Abstract

The invention discloses a piston type four-stroke internal-combustion engine with high mechanical efficiency. Compared with the prior art, the four-stroke internal-combustion engine of the invention corresponds to that a cylinder block is lengthened if the same discharge amount is available. The next stroke at the end of an air suction stroke is not a compression stroke but a push-back stroke. At the moment, an air inlet valve is not closed and a piston is firstly pushed back to ensure a part of gas in the cylinder returns to an air inlet channel. The air inlet valve is closed to enter the compression stroke when the piston is pushed back to a designed position, therefore, the push-back stroke and the compression stroke are combined into a complete stroke. An expansion stroke has a longer piston stroke than the compression stroke while only the piston stroke of the complete stroke combined by the push-back stroke and the compression stroke is equal to that of the expansion stroke, and an output stroke and the air suction stroke have the same piston stroke as the explosion stroke so as to increase the comparative compression ratio, thereby improving the mechanical efficiency of the internal-combustion and greatly improving the output efficiency of the engine in the same discharge amount so as to save energy, reduce emission and consumption.

Description

Technical field [0001] The invention relates to a piston type four-stroke internal combustion engine, in particular to a piston type four-stroke internal combustion engine capable of greatly improving the working efficiency of the four-stroke internal combustion engine, improving the combustion efficiency of fuel and saving energy under the condition of the same displacement. Background technique [0002] At present, the maximum volume of the combustion chamber (also known as cylinder) of the known piston-type four-stroke internal combustion engine is equal during the four strokes of normal work, and the strokes of the piston in the four strokes are the same, and its four strokes The working cycle is usually also called Otto (Otto) cycle. According to the Otto cycle heat engine work efficiency formula: η=1-(V b / V c ) 1-γ , where η is the work efficiency, V c is the minimum volume of compressed gas mixture in the cylinder, V b is the maximum volume of the cylinder (sing...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the low working efficiency of the piston-type four-stroke internal combustion engine, the inability to fully utilize the energy of the high-temperature and high-pressure gas in the power stroke, and insufficient combustion, the present invention provides a new type of piston-type four-stroke internal combustion engine. Extend the power stroke (also prolong the fuel combustion process), shorten the stroke of the compression stroke, so that the stroke of the piston in the power stroke is greater than the compression stroke, and the strokes of the other two strokes are the same as the power stroke, so that the power stroke can be fully utilized High-temperature and high-pressure gas in the medium, thereby greatly improving the output power and working efficiency of the engine, and achieving the goals of energy saving, emission reduction and consumption reduction

Images