Fuel metering valve

Abstract

The invention provides a fuel metering valve which comprises a ratio electromagnet. The ratio electromagnet comprises an outer shell. A lead piece and a plug are arranged on the outer side of the outer shell. An inner shell is arranged in the outer shell. A coil is arranged in the middle of the inner side of the inner shell. An inner hole is formed in the tail end of the inner side of the inner shell. An insert bush is arranged in the inner hole. A first sliding bearing is arranged on the inner side of the insert sleeve. An armature motion component is arranged on the inner side of the coil. The tail end of the armature motion component is inserted into the first sliding bearing and is in sliding connection with the first sliding bearing. A mechanical sliding valve is connected to the front end of the inner shell. A second sliding bearing is arranged in a valve bush of the mechanical sliding valve. The front end of the armature motion component is inserted into the second sliding bearing and is in sliding connection with the second sliding bearing. According to the fuel metering valve, deep hole precision machining is facilitated, friction resistance of the armature motion component can be reduced easily, action of the armature motion component is reliable and stable, the product motion performance is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to an electromagnetic valve, in particular to a fuel metering valve used in a fuel inlet system of an electronically controlled high-pressure common rail oil pump for a diesel engine. Background technique [0002] With the full implementation of the National V vehicle emission regulations, diesel engines are facing huge technical challenges. On the one hand, the country requires energy saving and emission reduction, and on the other hand, customers have higher requirements for the comfort and power of vehicles. Therefore, the higher-pressure high-pressure common rail fuel injection system has been favored by OEMs. [0003] In the high-pressure common-rail system, in order to control the pressure of the high-pressure common-rail cavity to be stable at the target pressure with a certain accuracy (pressure fluctuation ≤ 5%), it is necessary to have a certain relationship between the oil supply of the high-pressure pump and the oil co...

AI Technical Summary

Problems solved by technology

[0005] Due to the complex structure of conventional fuel metering valves, steel guide sleeves are mostly used for linear motion guidance in axial movement. Since the guide sleeves and moving parts are made of steel, the frictional resistance is relatively large, resulting in large linear hysteresis of product flow, which affects Product performance and life

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