Electronically controlled diesel injector driven by electrostriction element

Abstract

The invention relates to an electronically controlled diesel injector driven by an electrostriction element. A push rod, a precompression spring, a push rod seat, an electrostriction element assembly and a pretightening nut are axially installed in an injector shell in sequence, and an injector nozzle matching parts, a matching part gap adjusting spacer, an injector nozzle matching part return spring, a dictating oil chamber, a dictating piston return spring, a lower dictating oil seal valve seat spacer, a dictating piston, a lower dictating oil seal valve seat, a dictating piston matching part body and an upper dictating oil seal valve seat are axially installed in a nut sleeve in sequence. After the parts are installed, the injector shell and the nut sleeve are tightened, the end faces of all parts are tightly connected to form a seal, and an axially moving mechanism of a needle valve of an injector nozzle under the micro axial expansion control of the electrostriction element in a high pressure diesel state is formed. The diesel injector can realize precise high-frequency high-pressure diesel injection under the drive of the electrostriction element by using only one set of control matching parts which particularly refers to the dictating piston, and the cost and the manufacturing difficulty of the electronically controlled diesel injector for a diesel engine are reduced.

Description

【Technical field】 [0001] The invention relates to a fuel injector used in an electronically controlled diesel engine fuel injection system, in particular to an electronically controlled diesel fuel injector driven by an electrostrictive element using common rail electronically controlled fuel injection technology. 【Background technique】 [0002] At present, the diesel supply system of the common rail electronically controlled diesel engine uses an electromagnetic injector to inject high-pressure diesel into the cylinder. Since the electromagnetic coil of the electromagnetic injector has a certain degree of inductance when it works, it is difficult to respond to the requirements of higher injection frequency. , restricting the development of diesel engines in the direction of lower fuel consumption, cleaner emissions, and lower noise. 【Content of invention】 [0003] The object of the present invention is to provide an electronically controlled diesel fuel injector driven by...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide an electronically controlled diesel fuel injector driven by an electrostrictive element, which can enable the diesel engine to realize several times of pre-injection and main injection in a very short injection time, so that the diesel engine Various technical indicators of noise, fuel consumption, emission, and output power have been improved to solve the above-mentioned problems existing in the existing electromagnetic injectors

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