Electromagnetic fuel injection valve
An injection valve and fuel technology, which is applied to fuel injection devices, special fuel injection devices, charging systems, etc., can solve problems such as the increase in the deviation of fuel injection quantity, and achieve the advantages of reduced load, low cost, and reduced welding deformation. Effect
Inactive Publication Date: 2016-01-20
HITACHI AUTOMOTIVE SYST LTD
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Problems solved by technology
Moreover, the electromagnetic fuel injection valve, further, since the nozzle on the side opposite to the fuel piping side is fixed to the engine cylinder head, if the positional deviation and right angle between the fuel piping and the electromagnetic fuel injection valve are too large, the electromagnetic The type fuel injection valve itself is bent by the fuel pipe and the engine cylinder head, and there may be adverse effects such as large deviations in the fuel injection amount and deterioration of performance.
Method used
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Embodiment Construction
[0030] use figure 1 The overall configuration of the embodiment will be described. The subsequent figures are drawn on an enlarged scale for convenience of description, and are different from actual scales.
[0031] The fuel is pressurized by a high-pressure pump not shown in the figure 1 The cylindrical fuel passage 501 in the center is supplied to the electromagnetic fuel injection valve 1 through the spool 101 of a stainless steel cylindrical member. The electromagnetic fuel injection valve 1 has a cylindrical stainless steel nozzle 102 at its lower end, and its outer periphery is bounded by the engine head 6 . An injection hole 103 is provided at the lower end of the nozzle 102, and the supplied fuel is injected into an unillustrated engine cylinder at an amount and timing controlled by the electromagnetic fuel injection valve 1.
[0032] The piping 5 is a stainless steel cylindrical member having a fuel passage 5 . A stainless steel ball 3 having a cylindrical fuel pa...
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This electromagnetic fuel injection valve is configured such that a core (101), which is one of the parts constituting the electromagnetic fuel injection valve, is joined to a metal joint (2) by welding, and such that the amount of melting of the metal-joint-side portion of the weld where the metal joint (2) and the core (101) are welded is set to be greater than the amount of melting of the core-side portion of the weld. The electromagnetic fuel injection valve is provided with: a metal-joint end surface (203); a fuel seal section that has a cross-sectional area smaller than the area of the metal-joint end surface (203); and a core end surface (105) that has an area greater than the cross-sectional area of the fuel seal section. The metal-joint end surface (203) and the core end surface (105) are configured so as to communicate with each other through the fuel seal section.
Description
technical field [0001] The present invention relates to a fuel injection valve used in an internal combustion engine, particularly an in-cylinder injection engine for automobiles using gasoline. technical background [0002] Regarding electromagnetic fuel injection valves used in internal combustion engines, especially automotive in-cylinder injection engines that use gasoline, in order to meet the regulations and requirements for exhaust gas and fuel consumption, it is necessary to inject fuel into the engine cylinder at a higher pressure than before. The stressful market is increasingly demanding. This is because the higher the fuel pressure, the higher the fuel injection speed, the greater the frictional resistance with the air, the more atomized the fuel and the better the combustion performance. [0003] At this time, the conventional technology such as Japanese Patent Application Laid-Open No. 2011-220259 discloses that an O-ring is used for the connection between the...
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IPC IPC(8): F02M51/06F02M55/02
CPCF02M61/168F02M2200/856F02M2200/8084F02M51/061
Inventor 高奥淳司石川亨
Owner HITACHI AUTOMOTIVE SYST LTD