Oil nozzle assembly of diesel engine

Abstract

The invention relates to an oil nozzle assembly of a diesel engine. The oil nozzle assembly comprises an oil nozzle body (1), an oil nozzle needle valve (2), a needle valve guide rod (3), a needle valve spring (4), an oil injector body (5), an oil injector middleware (6) and gland nuts (7), wherein the oil nozzle body (1), the oil nozzle needle valve (2) and the needle valve guide rod (3) form a hydraulic balance oil nozzle assembly; the oil nozzle needle valve (2) is arranged in the oil nozzle body (1) and is internally provided with the needle valve guide rod (3); the hydraulic balance oil nozzle assembly is arranged below the oil injector middleware (6); the needle valve spring (4) is arranged at the root of the oil nozzle needle valve (2); and the oil injector middleware (6) and the hydraulic balance oil nozzle assembly are arranged below the oil injector body (5) by virtue of the gland nuts (7). The oil nozzle assembly provided by the invention has the advantages that the D-value between the closing pressure and opening pressure of the needle valve is reduced, the closing response speed of the needle valve can be increased, and the oil injection closing response speed can be improved by 10%.

Description

[0001] technical field [0002] The invention belongs to a part of a diesel engine, and in particular relates to a pair of fuel injection nozzles of a diesel engine. Background technique [0003] As the engine speed increases, the absolute injection time of the fuel supply system decreases. In order to ensure that the required fuel quality can be injected into the cylinder in time and to realize the multiple injection capability at high speeds, extremely high requirements are placed on the response speed of the injector during the injection process. [0004] Solenoid valve injector is an important component of the new generation of high pressure common rail system. It uses a high-speed solenoid valve to flexibly control the fuel injection timing and cycle injection volume. However, the fuel injection control method by adjusting the pressure change of the control chamber has a certain hydraulic delay, which causes a certain delay in the opening and closing timing of...

AI Technical Summary

Problems solved by technology

By increasing the spring stiffness of the needle valve, the closing response speed of the needle valve of the fuel injector is improved, but the opening resistance of the needle valve of the fuel injector is increased, which increases the opening delay of the needle valve of the fuel injector

Optimal matching of other parameters can only improve the response speed of opening or closing, and may also bring about other adverse effects

By increasing the oil inlet orifice area of ​​the control chamber, the closing response speed can be improved, but at the same time, the opening response becomes slower and the high-pressure fuel loss increases.

On the contrary, reducing the oil return jet area can reduce the closing delay and high pressure fuel loss, but increases the opening delay of the fuel injection

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