Combustion chamber of diesel engine

Abstract

The invention discloses a combustion chamber of a diesel engine. The combustion chamber arranged at the upper part of a piston body is designed into an eccentric type, the offset X' equals to 2.5mm, and the offset Y' equals to 5mm. The inner periphery of the combustion chamber is an annular necking which divides the inner periphery of the combustion chamber into two parts, i.e. a slope and a concave, the first part and the second part are in transition connection by an angle beta and a circular arc of R1, R2 is combined with the piston top surface; a punch insert platform is arranged in the center of the combustion chamber, the included angle beta between the slope and a horizontal line of the top surface of the piston body is 21 degrees; the arc length R1 of the transition segment between the slope and the concave equals to 2mm; and the circular arc radius R3 of the concave is tangential to the end lines of an included angle alpha of the punch insert and the transition surface of the concave, and the arc length R2 of the transition segment between the outer edge of the slope and the piston top surface is 2mm. The structural design of the combustion chamber is favorable for reasonably controlling the strength and the form of a vortex to fully mix fuel and air for combustion, and preventing the fuel from being stuck on the walls of the combustion chamber, and a large-angle punch insert is favorable for eliminating the dead volume to promote more sufficient combustion and improve the dynamics of the diesel engine and reduce the emission.

Description

technical field [0001] The invention belongs to the technology of internal combustion engines, and in particular relates to a combustion chamber of a diesel engine. Background technique [0002] At present, diesel vehicle engine pistons and two-valve intake ports need to be equipped with supercharged intercooling and electronic control systems. However, this method can only meet the requirements of Euro II standards in terms of emission control. At present, the minimum emission standards required by cities in my country for internal combustion engines are basically above Euro III. To meet the Euro III emission standards, a structure with more than two valves must be adopted. However, the structure with more than two valves will increase many parts, make the gas distribution structure relatively complicated, and also increase the frequency of failure and the difficulty in maintenance. On this premise, the present invention proposes a new combustion chamber structure based on...

AI Technical Summary

Problems solved by technology

However, the structure with more than two valves will add many components, making the gas distribution structure relatively complicated, and also increasing the frequency of failure and the difficulty of maintenance.

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