Diesel engine combustion chamber with concave-convex structure

Abstract

The invention discloses a diesel engine combustion chamber with a concave-convex structure. The combustion chamber is positioned at the upper part of the center of a piston body, an annular notch is formed at the inside circumference of the combustion chamber, and the inside circumference of the combustion chamber is divided into a sloping surface and a concave surface by the annular notch; a lug boss is arranged at the center of the combustion chamber, and the combustion chamber is in a concave-convex structural shape; a shallower slope is formed at the inside edge of the upper part of the combustion chamber, and the shallower slope transits to the deeper concave surface through the annular notch and then protrudes; the sloping surface, the annular notch, the concave surface and an inclined surface adjacent to the lug boss are connected by a series of tangential transition circular arcs; the concave-convex spatial structure of the combustion chamber can be matched with a fuel and air inlet system to reasonably control the vortex rate and the vortex strength; and in order to prevent a valve from colliding with the top of a piston, a valve reserving clearance space is reserved at the top of the piston. The diesel engine combustion chamber of the invention is used for a four-valve diesel engine, the emission level reaches the national standard III, the exhaust temperature is less than or equal to 700 DEG C, the noise limit is less than or equal to 116dB(A), and the emission amount of (nitric oxide) NOX and soot particles is reduced obviously.

Description

technical field [0001] The invention belongs to the internal combustion engine technology, in particular to a piston combustion chamber for a four-valve diesel engine. Background technique [0002] Diesel engines are widely used in large motor vehicles due to their high power output. However, if the oil and gas are not burned well, the pollution produced by diesel engines will be much higher than that of gasoline engines. Therefore, people have more and more requirements for the power and environmental protection of diesel engines. High, the country has also introduced strict regulations to limit the emissions of diesel engines. One of the main factors affecting the economy and power of a diesel engine is the design of the piston combustion chamber. The main defect prevalent in the current combustion chamber design is poor atomization, which leads to incomplete combustion of oil mist in the cylinder, resulting in increased fuel consumption and low emission levels. The most...

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Problems solved by technology

The main defect prevalent in the current combustion chamber design is poor atomization, resulting in incomplete combustion of oil mist in the cylinder, resulting in increased fuel consumption and low emission levels

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