A diesel engine cylinder piston and a diesel engine using the combustion chamber

Abstract

The invention discloses a cylinder piston of an engine diesel. The top surface of the cylinder piston is provided with a combustion chamber with a W-shaped axial section external profile; the inner wall of the outer side of the combustion chamber is provided with an arc-shaped ridge which is extended into an accommodating cavity, and the combustion chamber is divided into an inside conventional region and a groove region by a tangent line formed by the highest point of radial protrusion of the arc-shaped ridge; the outer edge of the throat opening of the combustion chamber is provided with an end bevel, so as to form a buffer region communicated with the groove region; the external profile of the buffer region is of asymptotic trend change from the groove region to the top surface of the piston. By virtue of the structural optimization of the combustion chamber, the upper vortex trend can be adjusted, and the problem that the thermal load of the bottom surface of a cylinder cover can be effectively avoided on the basis of improving the thermal efficiency and reducing the oil consumption. On the basis, the invention further provides a diesel engine applying the cylinder piston.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a cylinder piston of a diesel engine and a diesel engine using the combustion chamber. Background technique [0002] With the continuous rise of fuel prices, in the competition of vehicle power systems, people began to pay more and more attention to the issue of engine energy saving and consumption reduction. At present, how to achieve lower fuel consumption on the basis of ensuring compliance with emission regulations has become a severe challenge for major engine manufacturers. [0003] The shape of the traditional diesel engine combustion chamber is roughly "ω" shape, please refer to figure 1 As shown, the figure shows the axial section view of a piston with a "ω"-shaped combustion chamber, and the volume of the cavity formed by the middle non-shaded part rotating around the axial direction of the combustion chamber is the combustion chamber cavity of the piston. The pit, ap...

AI Technical Summary

Problems solved by technology

However, limited by its own structure, the vortex in the groove area B is too strong. After passing through the arc ridge shunt, there is very little space for the upper part to be mixed with the upper air, which limits the rapid mixing of oil and gas. Only when the piston continues to go down Good mixing can only be achieved after exercise, and at this time, the best period of burning to reduce fuel consumption has passed

Obviously, although the combustion chamber improves SOOT emissions, it cannot effectively control fuel consumption at the same time

[0005] In addition, compared with the traditional "ω" shaped combustion chamber, figure 2 The combustion chamber shown increases the proportion of fuel mixed in the upper space, and the proportion of the fuel-air mixture near the bottom surface of the cylinder head increases during the combustion deceleration period. This also brings another problem, that is, the heat on the bottom surface of the cylinder head load rise

[0006] In view of this, it is urgent to optimize the performance of the existing combustion chamber to effectively control fuel consumption and overcome the problem of high thermal load on the bottom surface of the cylinder head.

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