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Fuel injection valve

A technology of fuel injection and fuel oil, which is applied in the direction of fuel injection devices, fuel injection valves driven by fluid pressure, engine components, etc. It can solve the problems of temporary changes in the lifting amount of the armature stopper and easy lifting, etc., so as to improve the service life , reduced friction, long-term reliable and stable operation

Inactive Publication Date: 2006-11-08
BOSCH CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is a problem that when debris, etc. becomes trapped between the armature stopper and the armature plate surface, when the armature plate surface comes into contact with the armature stopper, between these two parts The friction becomes easy to rise, which causes a large temporary change in the lifting amount of the armature stop

Method used

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  • Fuel injection valve
  • Fuel injection valve

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Embodiment Construction

[0015] The present invention will be described in more detail below with reference to these figures.

[0016] figure 1 is a sectional view showing an example of an embodiment of the fuel injection valve according to the present invention. Denoted by reference numeral 1 is a fuel injection valve used in a common rail system for injecting / supplying fuel to a diesel internal combustion engine. This fuel injection valve 1 is mounted on a cylinder of an unshown diesel internal combustion engine, and is used to directly inject / supply only the required amount of high-pressure fuel supplied from the unshown common rail into the inside of the cylinder and at a desired timing . The fuel injection valve 1 includes a fuel injection nozzle bracket 2, the fuel injection nozzle 3 is fixed on the front end of the fuel injection nozzle bracket 2 by a fastening nut 4, and the solenoid valve 5 is arranged on the rear end of the fuel injection nozzle bracket 2.

[0017] The nozzle holder 2 inc...

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Abstract

A fuel injection valve (1) where the relief of a high-pressure fuel in a control chamber (45) to a fuel low-pressure section is controlled by a solenoid valve (5) for fuel injection control. The solenoid valve (5) is constructed such that lift operation of an armature plate (51) is controlled by an electromagnetic solenoid (68) assembled in a stationary sleeve (61) and armature stopper (67). A gap (G3) is provided between a stationary core (63) and the armature stopper (67) and through-holes (67B) are formed in the armature stopper (67), so that a drain fuel flows to the fuel low-pressure section through the gap (G3) and the through-holes (67B) when electricity is conducted through the solenoid valve (5). This results that the amount of lift of the armature plate (51) is prevented from being varied by a foreign object etc., contained in the drain fuel, caught between the armature plate (51) and the armature stopper (67).

Description

technical field [0001] The invention relates to a fuel injection valve which is provided with an electromagnetic actuator and serves to inject / supply fuel into the cylinder interior of an internal combustion engine. Background technique [0002] As a fuel injection valve for directly injecting / supplying fuel into cylinders of an internal combustion engine such as in a fuel injection common rail device, there is known a fuel injection valve of the type disclosed in, for example, JP-A-7-310621. This type of fuel injection valve is configured to energize a solenoid valve so that a control chamber within the injection valve body becomes partially communicated with the low pressure fuel, thereby removing back pressure on the valve piston, lifting the injector needle, and triggering fuel injection , stop the power supply to the solenoid valve after the predetermined time has elapsed, and release the communication state between the control chamber and the low-pressure part, thereby...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M47/00F02M47/02F02M51/00F02M63/00
CPCF02M47/027F02M63/0015F02M2547/003F02M47/00F02M51/00
Inventor 野崎浩明星川荣二
Owner BOSCH CORP
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