JPS6232230A - Fuel-injection engine - Google Patents

Abstract

PURPOSE:To improve the mixing efficiency of air and fuel as well as to smooth the inflow of an air-fuel mixture into a combustion chamber, by setting up a cylinder member, installing a through hole in the circumferential surface, free of rotation across a suction passage, and throttling the suction passage in a way of rotating the cylindrical member. CONSTITUTION:When a cylindrical member 7 interlocking with accelerator operation is situated in a full-open position, air A out of a surge tank 14 passes through the inside of a hole 8 of the cylindrical member 7 from the upstream side 5a of a suction pipe 5 and flows to the downstream side 5b of the suction pipe 5, and after that, it is mixed with fuel to be sprayed out of a fuel injector 13, then fed to a combustion chamber 15 from a suction port 4. On the other hand, when the cylindrical member 7 is rotated and the hole 8 is tilted, a part of an opening of a housing 10 is covered by a circumferential surface of the cylindrical member 7 so that a suction passage 6 is throttled. At this time, air B is guided to an upper part 8a of an inner circumferential surface of the hole 8, flowing to the downstream. Therefore, a turning angle of the cylindrical is altered properly whereby an air flow rate and a mixture ratio both are regulable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a fuel injection engine, and more particularly to means for adjusting intake air amount.

[Prior art]

In a typical fuel injection engine, a butterfly valve is provided in the intake pipe as an intake air amount adjusting means for controlling the mixture ratio of fuel and air. As is well known, this butterfly valve has a disc-shaped valve body and a central axis provided on the diameter of the valve body, and by rotating this central axis, the intake pipe can be opened and closed. The amount of intake air is adjusted.

However, in the above configuration, the air in the intake pipe flows through the gap between the periphery of the valve body and the inner circumferential surface of the intake pipe, so the flow is not smooth (and the air flows between the fuel injected into the intake pipe). [Objective of the Invention] In view of the above-mentioned circumstances, the present invention has been developed to improve the relationship between fuel and air. It is an object of the present invention to provide a fuel injection engine that improves the mixing condition and allows the air-fuel mixture to smoothly flow into a combustion chamber.

[Structure of the invention]

Therefore, in the present invention, a cylindrical member having a hole penetrating through the circumferential surface is disposed so as to be rotatable across the intake passage, and the cylindrical member is rotated to narrow the intake passage. By doing so, it is possible to achieve the above purpose by not disposing any member that obstructs the flow in the intake passage (and by allowing the inner circumferential surface of the hole to smoothly guide the air flowing in the intake passage. There is.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the specific structure of this invention is demonstrated in detail based on the drawing which shows an Example.

FIG. 1 conceptually shows the main parts of the fuel injection engine according to the present invention. 0 symbol l indicates the cylinder head 21
The engine body is composed of a cylinder block 3 and the like, and a cylinder head 21 is formed with a well-known intake boat 4. At the right end of the cylinder head 2, an intake pipe 5 communicating with the intake boat 4 is fixed. The intake boat 4 and the intake pipe 5 define an intake passage 6.The intake pipe 5 has a cylindrical member 7 extending orthogonally to its axis, in other words, the axis of the intake passage 6. As shown in FIG. 1, the central axis of the cylindrical member 7 extends perpendicularly to the plane of the paper. , and a hole 8 is bored between the peripheral surfaces, and the hole 8 is connected to the intake pipe 5.
The diameter is approximately the same as the inner diameter of the In addition, as shown in FIG.
a.

It is rotatably supported by a housing 10 provided in the intake pipe 5 via the intake pipe 9b. The cylindrical member 7 is rotated in conjunction with the operator's accelerator operation by means of a pulley 11 fixed to the pulley 11119b and a belt 12 wound around the pulley 11 and linked to an accelerator mechanism (not shown). Further, when the cylindrical member 7 is in the rotational position shown by the ridge in FIG. It is formed at an arbitrary position of the cylindrical member 7 so that the inner circumferential surface of the cylindrical member 7 is smoothly connected with the inner circumferential surface of the cylindrical member 7. On the other hand, a fuel injector 13 for fuel injection is attached to the lower left side of the intake pipe 5, and a surge tank 14 communicating with an air cleaner (not shown) is attached to the right end of the intake pipe 5. It is arranged.

When the cylindrical member 7 is in the fully open position, the air from the surge tank 14 flows smoothly into the hole 8 on the upstream side 5a of the intake pipe 5, as shown by arrow A in FIG. The air is guided to the side 5b and mixed with the fuel injected from the fuel injector 13, and flows into the combustion chamber 15 from the intake boat 4 as a mixture.Meanwhile, the cylindrical member 7 is rotated, When the hole 8 is tilted to the position indicated by the two-dot chain line, a portion of the opening defined in the housing 10 becomes
It is covered by the circumferential surface of the cylindrical member 70, thereby narrowing the intake passage 6. At this time, the air flowing into the hole 8 from the upstream side 51 of the intake pipe 5 is guided to the upper part 8a of the inner peripheral surface of the hole 8, and is directed to the upper left in the figure as shown by arrow B (in other words)
The fuel is guided to the vicinity of the nozzle 13a of the fuel injector 13, where it efficiently mixes with the fuel injected from the fuel injector 7, and after forming a mixture, it follows the intake boat 4 and flows into the combustion chamber 15. By appropriately changing the inclination of the hole 8, in other words, the rotation angle of the cylindrical member 70, the air flow rate within the intake passage 6 changes, thereby adjusting the mixture ratio. Further, when the cylindrical member 7 is rotated so that the hole 8 faces in the vertical direction in the figure, the intake passage 6 is closed by the circumferential surface of the cylindrical member 70, and the supply of the air-fuel mixture to the combustion chamber 15 is stopped. .

In another embodiment shown in FIG. 3, a cylindrical member 7 is disposed in the intake pipe 5' with its central axis facing in the vertical direction,
Moreover, the pulley 11 for rotating this cylindrical member 7 is
It is disposed below the intake pipe 5 via the shaft 9b'Y. As in the embodiment described above, the cylindrical member 7' is arranged so that its central axis is perpendicular to the axis of the intake passage 6', and a hole 8 is formed extending between the circumferential surfaces. The upper end of the cylindrical member 7' is particularly provided with a shaft, etc., and is supported by a housing lO. On the other hand, the fuel injector 13' is attached to the upper part of the intake pipe 5, avoiding the pulley 11'. The configuration and operation mode other than the above are basically the same as the embodiment shown in FIGS. 1 and 2 and described in detail, so the components having the same functions as those in FIGS. 1.2
A dash (゛) is added to the reference numerals in the figures, and detailed explanations will be omitted.

In addition, in the embodiment shown in FIGS. 1.2 and 3, the cylindrical members 7, 7 are both placed in the intake pipes 5, 5,
Intake bow forming part of intake passage 6.6') 4.4
In other words, it goes without saying that a cylindrical member may be disposed within the cylinder heads 2, 2.

〔Effect of the invention〕

As described in detail above, according to the fuel injection engine according to the present invention, a cylindrical member having a hole penetrating through the circumference is disposed across the intake passage, and by rotating this cylindrical member, Since the intake passage is narrowed and the intake air volume is adjusted, there is nothing in the intake passage that will obstruct the flow (also, since the air is guided by the inner circumferential surface of the hole, the air can flow smoothly inside the intake passage). Therefore, the air and fuel mix well, and the air-fuel mixture flows smoothly into the combustion chamber, improving the engine's output.

[Brief explanation of the drawing]

FIG. 1 is a conceptual side sectional view showing the main parts of the fuel injection engine according to the present invention, and FIG.
3 is a conceptual side sectional view showing another embodiment of the fuel injection engine according to the present invention. 4.4...Intake boat, 5,5...Intake pipe, 6,6
...Intake passage, 7.7'...Cylindrical member, 8.8...
・Hole, l O, 10'... Hakuji/g, 11.11・
...Pulley, 12.12...Bell), 13.13...
・Fuel Injector.

Claims (1)

[Claims] A fuel injection engine characterized in that a cylindrical member having a hole penetrating the circumferential surface is rotatably arranged across an intake passage, and the cylindrical member is rotated to narrow the intake passage. .