JPH061772U - Fuel injector - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To uniformly supply fuel to multiple intake pipes, atomize the fuel, and improve the fuel supply response speed. A fuel injection that injects fuel injected from a fuel injection valve into an intake passage on the engine side from a throttle valve and supplies the fuel from the intake passage to each cylinder forming the engine through a plurality of intake pipes. In the device, a fuel injection passage 7 that is located in the intake passage 2 on the engine side of the throttle valve 4 and opens along the longitudinal axis of the intake passage 2 toward the engine side, and is injected from the fuel injection valve 6. The injection valve injection passage 8 for injecting and supplying the fuel to the fuel injection passage 7 and the injection valve injection passage 8 are fixedly arranged in the fuel injection passage 7 and continuously form an annular gap S along the longitudinal axis of the intake passage 2. And the opening end 7A of the annular gap S on the engine side
Is opened toward the intake passage 2, and the opening end 7A on the engine side of the annular gap S is opened toward at least the openings 11F of the intake pipes 11A, 11B, 11C, 11D. Then, the remaining open end on the engine side is closed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fuel injection device for injecting fuel pressurized by a fuel pump into an intake passage through a fuel injection valve, and in particular, toward a suction passage on the engine side of a throttle valve, a single unit is provided. The present invention relates to a fuel injection device in a so-called single point injection system (hereinafter referred to as SPI system) in which fuel is injected from a fuel injection valve and is supplied to a plurality of intake pipes connected to each cylinder of an engine.

[0002]

[Prior art]

 There is Japanese Patent Application No. 2-247761 filed by the applicant of the present application as a fuel injection device having excellent atomization characteristics and uniformity of fuel in the SPI system. This fuel injection device is in the intake passage on the engine side of the throttle valve, is substantially parallel to the longitudinal axis X-X of the intake passage, is closed on the upstream side and is open on the downstream side, and is downstream. The fuel injection path is provided with an enlarged inclined portion whose inner diameter is temporarily enlarged toward the downstream side of the intake path, and the fuel injected from the fuel injection valve is injected into the fuel injection path. In order to do so, the fuel injection valve is opened in the fuel injection path, and is disposed at least in the enlarged slope portion of the fuel injection path, and is continuous with the enlarged slope portion along the longitudinal axis Y-Y of the fuel injection passage. The fuel is injected from the fuel injection valve to the cone member in the fuel injection path through the injection valve injection path. To be done. The fuel that has collided with the cone member flows down at a high injection speed through the annular gap formed between the enlarged inclined portion of the fuel injection passage and the enlarged inclined protrusion of the cone member, and the fuel at the downstream side of the fuel injection passage It is injected from the outlet into the intake passage. The fuel flowing down the annular gap does not decrease in fuel flow velocity because the annular gap is formed with a relatively small volume (small gap), and the annular gap is formed continuously. A reliable annular fuel foam can be formed, and the annularly formed fuel can be expanded and injected from the end of the fuel injection path toward the inner surface of the intake path.

[0003]

[Problems to be solved by the device]

 According to such a conventional fuel injection device, the fuel injected from the engine-side open end of the annular gap into the intake passage is annularly injected into the intake passage through the annular gap. According to this, the fuel injected facing the opening of each intake pipe is smoothly sucked toward the opening of the intake pipe, but the portion not facing the opening of the intake pipe (toward the intake pipe wall) ) Is likely to collide with the intake pipe wall, which causes the fuel to flow down along the intake pipe wall, or the well atomized fuel is condensed again. Fear arises, hindering fuel atomization and uniform fuel distribution and fuel response speed for each intake pipe. The fuel injection device according to the present invention has been developed to solve the above-mentioned problems, and its purpose is to uniformly distribute fuel to a plurality of intake pipes, atomize the fuel, and improve the fuel response speed. It was done.

[0004]

[Means for Solving the Problems]

 According to the present invention, in order to achieve the above object, the fuel injected from the fuel injection valve is injected into the intake passage on the engine side from the throttle valve, and the fuel is injected from the intake passage through the plurality of intake pipes. In the fuel injection device for supplying to the engine, a fuel injection path that is in the intake passage on the engine side of the throttle valve, opens along the longitudinal axis XX of the intake passage, and opens toward the engine side; The injection valve injection passage for injecting and supplying the injected fuel to the fuel injection passage, and the fixed arrangement in the fuel injection passage, and the annular shape along the longitudinal axis XX of the intake passage. And a cone member that continuously forms a gap and opens the engine-side opening end of the annular gap toward the intake passage. The engine-side opening end of the annular gap is defined by at least a plurality of intake pipes. Opened toward the opening and closed the remaining opening end on the engine side A.

[0005]

[Action]

 The fuel injected from the opening end of the annular gap on the engine side is injected only toward the openings of the plurality of intake pipes, and the fuel is not injected from the annular gap of the portion not facing the openings of the remaining intake pipes. Thus, since the fuel is injected only toward the opening of each intake pipe, the fuel can be uniformly distributed to each intake pipe and the fuel response speed can be increased.

[0006]

【Example】

 An embodiment of the fuel injection device according to the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a main part of the fuel injection device, and FIG. 2 is a plan view in which the main part of the fuel injection device in a state of being crossed along the line PP in FIG. 1 is attached to an intake pipe. . Reference numeral 1 denotes a throttle valve main body having an intake passage 2 penetrating downward from above, and the intake passage 2 has a throttle valve attached to a throttle valve shaft 3 rotatably supported by the throttle valve main body 1. 4 is arranged, and the throttle valve 4 controls the intake passage 2 to open and close. Reference numeral 5 denotes an injection valve main body arranged below the throttle valve main body 1. The intake passage 2 also penetrates the injection valve main body 5 from the upper side to the lower side. By connecting the main body 5 with each other, an intake passage 2 penetrating each main body 1, 5 is formed. In No. 6, when current flows through the solenoid coil due to a signal from the ECU (Electronic Control Unit), the core is attracted and the flange of the needle valve that is integral with the core is attracted until it hits the spacer to fully open the valve. However, it is a known fuel injection valve that injects the fuel pressurized by the fuel pump from its tip. (The description of the internal structure of the fuel injection valve is omitted.) 7 is a fuel injection passage provided in the injection valve body and is configured as follows. That is, the fuel injection passage 7 has a circular cross section, is located in the intake passage 2 on the downstream side (downward in FIG. 1, the engine side) of the throttle valve 3, and the longitudinal axis of the fuel injection passage 7 is It is parallel to the longitudinal axis of the intake passage 2, its upstream side is closed, and its downstream side opens toward the inside of the intake passage 2 via the opening end portion 7A. That is, the open end portion 7A forms an annular surface. Reference numeral 8 denotes an injection valve injection path for injecting the fuel injected from the fuel injection valve 6 into the fuel injection path 7, one end of the injection valve injection path 8 is connected to the injection port of the fuel injection valve 6, The other end opens to the fuel injection path 7. Then, in the fuel injection passage 7, a cone member 9 which forms an annular gap with the inner diameter portion of the fuel injection passage 7 is arranged.

The cone member 9 is well shown in FIG. 3, and has an outer diameter portion 9A having a smaller diameter than the inner diameter portion 7B of the fuel injection passage 7 and has an annular shape facing the opening end portion 7A of the fuel injection passage 7. An annular projecting portion 9C that has the flange portion 9B and is in contact with the opening end portion 7A is formed on a part of the annular flange portion 9B. The cone member 9 is attached to the inside of the fuel injection passage 7 by means of a screw 10. According to this, the inner diameter portion 7B of the fuel injection passage 7 and the outer diameter portion 9A of the cone member 9 make the length of the intake passage 2 longer. A continuous annular space S is formed along the direction axis, and a part of the open end portion 7A of the fuel injection path 7 and the annular flange portion 9B of the cone member 9 form an annular gap S at one end. A fuel injection gap E is formed, which is continuous with the other end of which opens into the intake passage 2, while the other end of the fuel injection passage 7A (open end other than the one portion) and the annular projection of the cone member 9 are formed. The opening of the annular gap S into the suction passage 2 is closed by the portion 9C.

The positioning of the annular flange 9B and the annular projection 9C of the cone member 9 with respect to the fuel injection path 7, that is, the positioning of the fuel injection gap E is performed as follows. That is, 11 is an intake pipe that connects a plurality of cylinders (not shown) forming the engine to the intake passage 2 of the throttle valve body 1 and the injection valve body 5, and the intake passage 2 of the intake pipe 11 is connected to the intake pipe 2. Since a plurality of intake pipes 11A, 11B, 11C, 11D are branched toward the respective cylinders from the collecting part on the side, in this example, the respective intake pipes 11A, 11B, 11C, 11D are arranged on the left side in FIG. The openings 11F of the intake pipes 11A, 11B, 11C, and 11D that are formed are directed toward the region F on the left side of the intake passage 2. A region F on the left side of the intake passage 2 is shown in FIG. The fuel injection gap E formed by the annular collar portion 9B and the opening end portion 7A of the fuel injection passage 7 is formed in the region F, while the annular projection 9C is formed at the opening end portion of the fuel injection passage 7. The region that is in contact with 7A and closes the open end 7A of the fuel injection passage 7 is performed in the region G other than the region F described above. According to the above, the fuel injection gap E is formed toward at least each opening 11F of each intake pipe 11A, 11B, 11C, 11D, and the remaining opening end portion 7A that does not face each opening, that is, in FIG. The closed open end 7A in the region G shown is formed toward the intake pipe wall 11G on the right side in FIG. In addition, in the above description, the fact that the fuel injection gap E opens toward the opening 11F of the intake pipe 11 includes opening opposite to each other when viewed in a plan view as shown in FIG. Therefore, it is not limited to the openings facing each other in the cross section.

Next, the operation will be described. During operation of the engine, the fuel injected from the fuel injection valve 6 is injected from the injection valve injection passage 8 into the fuel injection passage 7, and this fuel flows down through the annular gap S and is sucked from the lower end thereof. It is injected into the path 2. Here, in the present proposal, the fuel flowing down through the annular gap S is injected from the fuel injection gap E toward the inside of the intake passage 2, and the fuel injection gap E is connected to each intake pipe 11A. , 11B, 11C, and 11D are opened toward the respective openings 11F, the fuel injected from the fuel injection gap E does not collide with other parts, and the intake pipes 11A are smoothly and promptly. , 11B, 11C, 11D. Therefore, the fuel injected from the fuel injection gap E is uniformly atomized and uniformly supplied to the openings of the intake pipes facing each other, so that the fuel distribution can be improved. At the same time, since the response speed of fuel supply can be increased, the output performance of the engine can be improved and the emission of harmful exhaust gas components can be effectively suppressed. On the other hand, the opening end 7A of the fuel injection passage 7 that does not face the openings 11F of the intake pipes 11A, 11B, 11C, and 11D, in other words, the annular gap S in the G region shown in FIG. Since the mouth end portion 7A comes into contact with the annular protrusion 9C of the cone member 9 and is closed, fuel is not supplied from the annular gap S. According to this, the intake pipe wall 11G on the right side in FIG. Since the fuel is not injected toward the nozzle, the problem caused by the fuel colliding with the intake pipe wall 11G is solved. Specifically, the above-mentioned problems are condensation of atomized fuel, dropping of fuel, and non-uniformity of fuel.

[0010]

[Effect of device]

 As described above, according to the present invention, the fuel injected from the fuel injection passage is surely injected toward the opening of each intake pipe, so that the fuel distribution is made uniform, the fuel atomization is improved, and the fuel response speed is improved. As a result, the engine performance was significantly improved and the harmful exhaust gas component was reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a fuel injection device according to the present invention.

FIG. 2 shows a state of attachment to an intake pipe including a lateral cross-sectional view of a main part taken along the line P-P of FIG.

3 is a perspective view showing the cone member of FIG. 1. FIG.

[Explanation of symbols]

 2 intake passage 4 throttle valve 7 fuel injection passage 7A opening end 8 injection valve injection passage 9 cone member S annular gap 11 intake pipe 11F opening of each intake pipe

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location F02M 61/18 340 B 9248-3G // F02M 35/10 102 C 9247-3G

Claims (1)

[Scope of utility model registration request] 1. A fuel injected from a fuel injection valve is injected into an intake passage on the engine side from a throttle valve, and the fuel is supplied from an intake passage into each cylinder constituting an engine through a plurality of intake pipes. In the fuel injection device, the fuel injection path 7 located in the intake passage 2 on the engine side of the throttle valve 4, along the longitudinal axis of the intake passage 2 and opening toward the engine side, and the fuel injection valve 6 An injection valve injection passage 8 for injecting and supplying the injected fuel to the fuel injection passage 7, and an annular gap fixedly arranged in the fuel injection passage 7 along the longitudinal axis of the intake passage 2. And a cone member 9 that forms S continuously and that opens the opening end 7A of the annular gap S on the engine side toward the intake passage 2, and the opening end 7A of the annular gap S on the engine side.
At least a plurality of intake pipes 11A, 11B, 11C, 1
A fuel injection device that opens toward a 1D opening 11F and closes the remaining opening end on the engine side.