Valves and valve actuation – Electrically actuated valve – Including solenoid
Patent
1997-02-24
2000-04-11
Moulis, Thomas N.
Valves and valve actuation
Electrically actuated valve
Including solenoid
251285, 2395334, 2395811, F02M 5106
Patent
active
060479485
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a fuel injection nozzle that supplies fuel to an internal combustion engine such as a diesel engine. In particular, it relates to a fuel injection nozzle capable of achieving various spraying patterns by changing the lift quantity of the needle valve and the total opening area of the nozzle hole contributing to injection.
DESCRIPTION OF THE RELATED ART
Fuel injection nozzles employed in internal combustion engines include, for instance, the one disclosed in Japanese Unexamined Patent Publication No. S59-200063, which injects fuel through a nozzle hole formed at the front end portion of a nozzle body, with a pressure receiving surface formed in a tapered shape provided at a needle valve housed slidably inside the nozzle body and the needle valve made to open by applying fuel pressure to the pressure receiving surface.
In addition, more recent examples include the fuel injection nozzle disclosed in Japanese Unexamined Patent Publication No. H4-76266, which features a technology through which promotion of combustion, improved power and fuel efficiency, reduced combustion noise and reduced NOx discharge are achieved by forming a passage for inducing pressurized fuel to the front end portion of a nozzle body 1, forming a plurality of nozzle holes 2 that communicate with this passage, inserting a rotary valve (rotating shaft) 17 through a needle valve which performs control of intermittent fuel inflow to the passage and varying the rotating position of the rotary valves (rotating shaft) 17 to increase/decrease the opening area of the nozzle holes contributing to fuel spray so that the injection pressure, the injection period and the injection quantity can be varied.
However, in the first fuel injection nozzle, which employs a structure in which the injection pressure, the injection quantity, the injection period and the like are determined by an injection pump that delivers fuel to the fuel injection nozzle, the number of nozzle holes is fixed and, consequently, it is not structurally possible to increase/decrease the total area of the nozzle holes contributing to injection. This presents a problem in that it is difficult to maintain a good combustion state since the injection pressure will be reduced during low speed rotation of the engine and the injection period will be reduced in a low load state of the engine.
In addition, in the second fuel injection nozzle that employs a system in which the nozzle hole in the nozzle body is blocked off from the inside by the rotating shaft, as shown in FIG. 26, there is actually no change in the nozzle hole opening area at the surface of the nozzle body as the nozzle hole is merely constricted from the inside. Thus, there is a problem in that the sprayed fuel does not readily become finely atomized. Moreover, since, in the system in which the nozzle hole in the nozzle body is blocked from the inside, a plurality of guide grooves 18 are required, as shown in FIG. 1 in Japanese Unexamined Patent Publication No. S4-76266, the suck volume cannot be reduced and, consequently, there is a likelihood of residual runoff of fuel occurring after injection, increasing the discharge quantity of HC. Furthermore, in such a structure, it is necessary to improve the accuracy of axial alignment of the needle valve 3 and the rotating shaft 17.
In addition, in the structures in the prior art, there is another problem in that since the structures do not allow the lift quantity of the needle valve to be changed intentionally, it is not possible to vary the injection state intentionally by adjusting the lift quantity to change the pressure loss and cause the injection quantity to increase or decrease to change the injection pressure and the injection rate or the like.
Reflecting the problems discussed above, an object of the present invention is to provide a fuel injection nozzle that is capable of achieving desired injection patterns by intentionally varying the lift quantity of the needle valve or by varying the total area of the noz
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Hasegawa Toshiyuki
Miyamoto Takeshi
Nozaki Shinya
Moulis Thomas N.
Zexel Corporation
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