Low-emission single-cylinder water-cooling direct injection diesel

Abstract

The invention relates to a low-emission single-cylinder water-cooling direct injection diesel. The eccentricity of a crankshaft is 32.5 mm, the central distance of a connecting rod is 100 mm, an oil sprayer is a P-type oil sprayer, and the distance between an air inlet center of a cylinder cover and the surface of a valve seat ring is 31 mm; the height of a helical chamber is 22 mm; the distance from the air inlet center to a central connecting line between an inlet valve and an outlet valve is 26 mm; the section of a helical air inlet passage is of an isosceles trapezoid, and an air guide screen is arranged in the helical air inlet passage; a necking Omage-shaped combustion chamber is arranged at the top of a piston, the diameter of an upper mouth hole of the combustion chamber is 34 mm,the cone angle of a cone-face hole is 80 degrees, the cone angle of a central convex cone is 114 degrees, and the depth of the necking Omage-shaped combustion chamber is 10.5 mm. Compared with the similar vortex chamber type 176 diesel, the invention greatly improves the low-temperature starting performance, wherein the lowest starting temperature reaches minus 5 DEG C; and the fuel consumption ratio reaches below 270g / KW.h which is reduced by 15-20 percent compared with the vortex chamber type similar models.

Description

technical field [0001] The invention relates to a single-cylinder water-cooled diesel engine, in particular to a direct-injection diesel engine with a cylinder diameter of 76 mm, a stroke of 65 mm, a power of 3.82 kilowatts and a rotational speed of 3000 rpm. Background technique [0002] At present, the combustion systems of single-cylinder water-cooled diesel engines with a displacement of less than 0.3 liters, such as 176, 170, and 165, are all vortex chamber-type. These models are mainly equipped with micro-tillers, water pumps, small generator sets, etc. , with an annual demand of about 1 million units, occupying an important position in agricultural production. This type of diesel engine is not only difficult to start at low temperature, but also has high fuel consumption. The present invention provides a direct injection modification scheme for the existing vortex chamber type 176 single-cylinder diesel engine, which can lower the cold start temperature of the diesel...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of poor low-temperature starting performance and high fuel consumption in the existing vortex chamber type 176 single-cylinder diesel engine, the present invention provides a low-displacement single-cylinder water-cooled direct-injection diesel engine with a cylinder diameter of 76 mm and a stroke of 65 mm , with a displacement of 0.295 liters, a power of 3.82 kW, a speed of 3000 rpm, a minimum starting temperature of -5°C, and a fuel consumption rate of less than 270 g / kW·h

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