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Fuel injector and its control valve

A technology for controlling valves and injectors, used in fuel injection devices, fuel injection devices with anti-corrosion measures, machines/engines, etc., to achieve functional and reliable results

Active Publication Date: 2020-03-06
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to improve the fuel injector to alleviate or eliminate the aforementioned problems caused by valve core erosion in the prior art

Method used

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  • Fuel injector and its control valve
  • Fuel injector and its control valve
  • Fuel injector and its control valve

Examples

Experimental program
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Embodiment Construction

[0024] Some possible implementations of the present application are described below with reference to the accompanying drawings.

[0025] Figure 4 The middle part shows a fuel injector for injecting fuel into an engine according to a possible embodiment of the present application, especially an injector in a diesel common rail injection system. The fuel injector comprises a control valve and an injection valve assembled together, for example, they may be assembled in a common injector housing 8 (not shown in detail). The improvements of this application relate to control valves, therefore Figure 4 Only the relevant part of the control valve is shown in . The injection valve is combined on the front side of the control valve ( Figure 4 the lower side in the center), toward the engine. The control valve is switchable between an open state and a closed state. By controlling the opening and closing state of the valve, the fuel injection action of the injection valve is con...

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Abstract

A fuel injector and a control valve used in it are disclosed. The control valve comprises: a valve seat defining a valve seating surface and a valve hole extending through a center portion of the valve seating surface in a longitudinal direction, the valve hole and the valve seating surface defining a longitudinal central axis, and the valve hole being in fluid communication with an injection valve of the fuel injector; a valve element configured to be moved between a closed position and an opened position along the longitudinal central axis, the valve element contacting and cooperating with the valve seat in the closed position to close the valve hole, and the valve element being moved away from the valve seat in the opened position to open the valve hole; and a holding block having an accommodating recess for holding the valve element; wherein the valve element is in the form of a solid of revolution, with the longitudinal central axis being the revolution axis of the solid of revolution, and the solid of revolution having a non-circular section in a longitudinal plane in which the longitudinal central axis lies so that the valve element is able to rotate around the longitudinal central axis but cannot rotate around any transverse central axis that is perpendicular to the longitudinal central axis.

Description

technical field [0001] The present application relates to a control valve for use in a fuel injector, and a fuel injector, in particular a common rail injector, comprising such a control valve. Background technique [0002] A fuel injector usually includes a control valve and an injection valve, and the fuel injection action of the injection valve is controlled by the opening and closing state of the control valve. figure 1 A partial structure of the control valve is schematically shown in , the control valve includes a valve seat 1, which is formed with a valve hole 2 and a valve seat surface 3; a spherical valve core 4, which cooperates with the valve seat surface 3 to realize the valve Opening and closing of the hole 2; holding block 5, which houses a part of the spool 4 and is used to push the spool 4 to the position of closing the hole 2. The valve hole 2, the valve core 4 and the holding block 5 are arranged along the central axis Z extending longitudinally of the con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M47/00F02M61/18
CPCF02M47/027F02M63/0031F02M63/0036F02M2200/05
Inventor 陈彦霖
Owner ROBERT BOSCH GMBH
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