JP2533569Y2 - Throttle body in fuel injector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-point injection type fuel injection system for injecting fuel from a single injector into an intake passage on the engine side from a throttle valve.

[0002]

2. Description of the Related Art A conventional example of such a one-point injection type fuel injection device is disclosed in Japanese Utility Model Laid-Open No. 59-163173. Such a conventional example will be described with reference to FIG. Reference numeral 10 denotes a throttle body that is formed by vertically penetrating an intake passage 11 connected to the engine.
The opening and closing are controlled by a flat throttle valve 13 attached to a shaft 12 rotatably supported at zero. on the other hand,
In the intake passage 11A of the throttle body 10 on the engine side from the throttle valve 13, a small diameter smaller than the intake passage 11 is located substantially concentric with the center of the intake passage 11A, along the longitudinal axis YY of the intake passage 11A. The venturi 14 is formed, and the fuel injected from the injector 15 is injected and supplied into the small venturi 14 via the fuel injection passage 16. The longitudinal axis direction XX of the small venturi 14 and the longitudinal axis direction YY of the intake passage 11 are on the same line.
According to the above, fuel is supplied into the intake passage 11A from the opening end 14A of the small venturi 14 on the engine side.
The fuel supplied from the small venturi 14 into the intake passage 11A is supplied to the outer peripheral wall 14B of the small venturi 14 and the intake passage 11A.
The air-fuel mixture is formed while being wrapped in the air flowing through the annular gap formed by the inner peripheral wall 11 </ b> B and supplied to the engine. Thus, the small venturi 1 is placed in the intake passage 11A.
The technology of supplying fuel from the small venturi 14 into the intake passage 11A is based on a technique of supplying fuel injected from a single injector toward a multi-cylinder engine. It is effective in terms of distribution.

[0003]

The conventional fuel injection system has the following problems. Small venturi 1
Air and fuel flowing through the intake passage 11A near the open end 14A of the fourth air passage 4 must not be deflected to one side with respect to the intake passage 11A. Here, looking at the airflow flowing through the intake passage 11A near the opening end 14A of the small venturi 14, the airflow is affected by the inclination of the throttle valve 13 in the intermediate opening degree region of the throttle valve 13, and the airflow in the intake passage 11A is reduced. There is a possibility that it will be deflected to one side and flow. However, in such a state, the deflection of the air flow due to the inclination of the throttle valve 13 can be easily suppressed by sufficiently separating the throttle valve 13 upstream from the small venturi 14. On the other hand, when the fuel supplied from the open end 14A of the small venturi 14 into the intake passage 11A is viewed, the fuel is opposed to the fuel injection passage 16 (to the left with respect to the longitudinal axis direction XX of the small venturi 14). It may be deflected. That is, the small venturi 14 is arranged concentrically with the intake passage 11A, so that the inner wall 14C of the small venturi 14 facing the fuel injection passage 16 is located on the left side of the longitudinal direction XX of the small venturi 14 in the figure. This is because the fuel injected with pressure from the fuel injection passage 16 collides with the inner wall 14C and is deflected to the left with respect to the longitudinal axis direction XX. In order to suppress this, the small venturi 14 is moved to the right in FIG. 1, and the inner wall 14C of the small venturi 14 is
Although it is considered to be arranged on the longitudinal axis direction YY of 1A, according to this, the outer peripheral wall 14 of the small venturi 14 is considered.
A uniform annular passage cannot be formed by B and the inner peripheral wall 11B of the intake passage 11. That is, a right gap S formed by the right outer peripheral wall 14B of the small venturi 14 and the right inner peripheral wall 11B of the intake passage 11.
1 is smaller than a left gap S2 formed by the left outer peripheral wall 14B of the venturi 14 and the left inner peripheral wall 11B of the intake passage 11, and cannot uniformly flow air around the outer periphery of the small venturi 14. This makes it difficult to uniformly mix air with the fuel supplied from the open end 14A of the small venturi 14. The present invention has been made in view of the above problems, and in a throttle body of a fuel injection device provided with a small venturi, uniform air flows through an annular passage formed by an outer peripheral wall of the small venturi and an inner peripheral wall of the intake passage. By supplying the fuel supplied into the intake passage from the opening end of the small venturi to the substantially center of the intake passage by colliding with the inner wall of the small venturi and providing air along the center of the intake passage, An object of the present invention is to provide a throttle body having a good distribution with respect to a multi-cylinder engine by uniformly forming an air-fuel mixture.

[0004]

According to the present invention, an object of the present invention is to provide an intake passage which passes through the inside toward the engine, and a throttle valve for opening and closing the opening area of the intake passage is rotatable in the intake passage. A small venturi is formed in the intake passage on the engine side of the throttle valve, and the fuel is injected and supplied from the injector toward the small venturi. This is achieved by providing a fuel impingement wall in the small venturi provided at the center of the small venturi, which is opposed to the fuel injection passage of the injector, is substantially at the center in the cross section of the small venturi, and extends along the longitudinal axis of the small venturi.

[0005]

By forming the small venturi concentrically in the longitudinal axis direction of the intake passage, the annular passage formed by the outer peripheral wall of the small venturi and the inner peripheral wall of the intake passage can be formed uniformly, whereby the small venturi can be formed. The uniform air can be caused to flow around the outer periphery of. Since the fuel injected from the fuel injection passage toward the fuel collision wall in the small venturi is located at the center of the cross section of the small venturi and along the longitudinal axis of the small venturi, the center of the small venturi is Fuel can be supplied further into the intake passage. Thus, a mixture of fuel and air can be uniformly supplied to the intake path.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a throttle body in a fuel injection device according to the present invention will be described below with reference to FIGS. FIG. 1 is a vertical sectional view of a main part, and FIG. 2 is a horizontal cross-sectional view of a main part along line PP in FIG. The same components as those in FIG. 3 are denoted by the same reference numerals. Reference numeral 14 denotes a small venturi disposed in the intake passage 11A on the engine side with respect to the throttle valve 13. The longitudinal axis XX of the small venturi 14 is concentric with the longitudinal axis YY of the intake passage 11. It is in. Thus,
The annular passage R formed by the outer peripheral wall 14B of the small venturi 14 and the inner peripheral wall 11B of the intake passage 11 is the intake passage 1
1. Formed concentrically with the small venturi 14. In the present invention, the fuel collision wall 1 is provided in the small venturi 14, and the fuel collision wall 1 satisfies the following requirements. (1) The fuel collision wall 1 is inside the small venturi 14 and faces the opening of the fuel injection passage 16 to the small venturi 14. (2) The fuel collision wall 1 is located at the center of the cross section of the small venturi 14 and extends along the longitudinal axis direction XX of the small venturi 14.

According to the above, the annular passage R between the outer peripheral wall 14B of the small venturi 14 and the inner peripheral wall 11B of the intake passage 11 is formed.
Flows evenly with respect to the intake passage 11A. This is because the longitudinal direction XX of the small venturi 14 is arranged concentrically with respect to the longitudinal direction YY of the intake passage 11. On the other hand, the fuel injected from the injector 15 is injected toward the fuel collision wall 1 in the small venturi 14 through the fuel injection passage 16, and the fuel is injected into the small venturi 14 after colliding with the fuel collision wall 1. The air is supplied into the intake passage 11A from the open end 14A. Here, since the fuel collision wall 1 is formed at the center of the transverse section of the small venturi 14 and along the longitudinal axis direction XX of the small venturi 14, the fuel is supplied to the central portion of the small venturi 14 (in other words, Longitudinal axis direction Y− of intake path 11
Y), it can be supplied to the intake path 11A. Since the fuel supplied from the central portion of the small venturi 14 is mixed with the uniform air flowing through the annular passage R, it is possible to form a uniform and uniform mixture with respect to the intake passage 11B. Thus, the mixture can be uniformly supplied to each cylinder constituting the engine.

[0008]

As described above, according to the present invention, in the small venturi concentrically provided in the longitudinal axis direction of the intake passage, the small venturi is opposed to the fuel injection passage of the injector and substantially at the center in the cross section of the small venturi. Since the fuel collision wall extending along the longitudinal axis of the small venturi is provided, the fuel supplied from the opening of the small venturi is mixed into the air flowing uniformly in the intake passage without being deflected. In addition, uniform fuel supply can be performed to each cylinder constituting the engine, and a marked improvement in engine performance can be achieved.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of an essential part taken along line PP of FIG. 1;

FIG. 3 is a longitudinal sectional view showing a main part of a conventional fuel injection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel collision wall 10 Throttle body 11 Intake path 13 Throttle valve 14 Small venturi

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication F02M 69/00 350T

Claims (1)

(57) [Scope of request for utility model registration] 1. An intake passage extending through the interior toward the engine,
A throttle valve for opening and closing the opening area of the intake path is rotatably arranged in the intake path, and a small venturi is formed in the intake path on the engine side of the throttle valve, and fuel is injected from the injector toward the small venturi. In a fuel injection device to be supplied by injection, a small venturi 14 concentrically provided in the longitudinal axis direction YY of the intake passage 11 faces the fuel injection passage 16 of the injector 15 and has a cross section in the cross section of the small venturi 14. A throttle body in a fuel injection device provided with a fuel collision wall 1 substantially at the center and extending along the longitudinal axis XX of the small venturi 14.