fuel injector

A technology of fuel injectors and nozzles, which is applied in the direction of machines/engines, fuel injection devices, engine components, etc., and can solve problems such as many high-pressure leakage links, unsatisfactory pressure response speed, and complex structures
CN102748179BInactive Publication Date: 2016-03-09袁辉
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
袁辉
Publication Date
2016-03-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

Provided is a fuel injector for a diesel engine. A plunger is arranged in the fuel injector, and the plunger and a fuel nozzle needle valve are combined into a pair of matching parts. The matching parts can be in a mode that the fuel nozzle needle valve is installed in an inner hole of the plunger or in a mode that the plunger is installed in an inner hole of the fuel nozzle needle valve. Fuel injection and fuel feeding of a high-pressure cavity can be controlled through an electric control method or a mechanical method. The plunger can be pushed through a mechanical method or a hydraulic method, wherein pressurizing injection can be further achieved by means of the hydraulic method. The fuel injector reduces volume of the high-pressure cavity and a leakage link furthest. Therefore, the fuel injector is quick in pressure building up, less in leakage amount, high in injection pressure, clean in discharged tail gas and low in fuel consumption. An electric control valve is not driven by an armature directly, and clearance between a solenoid valve and the armature can be smallest, so that miniaturization of the solenoid valve is facilitated.
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Description

technical field

[0001] The invention relates to a fuel injector for a diesel engine. Background technique

[0002] Currently known fuel injectors for diesel engines, the nozzle needle valve only plays the role of cutting off fuel injection, and the plunger responsible for providing high-pressure diesel usually has the following three methods.

[0003] 1. It is installed on a separate fuel injection pump. The fuel injection pump and the fuel injector are connected by high-pressure oil pipes. Typical representatives include traditional mechanical fuel injection pump-fuel injector systems, high-pressure common rail fuel injection systems, and single pumps. fuel injection system.

[0004] 2. It is installed on the top of the injector, separated from the nozzle in the injector. The plunger and the nozzle are connected by a built-in oil passage, that is, the pump nozzle type fuel injection system.

[0005] 3. It has the above two characteristics at the same time. The plunger in ...

Claims

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