JPH061774U - Throttle body in fuel injection system - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] In the throttle body that supplies fuel to the engine from a small venturi provided in the intake passage on the engine side from the throttle valve, the mixture formed in the intake passage is controlled. It is controlled to be uniform and even, and a uniform air-fuel mixture is supplied to each cylinder forming the engine. A small venturi 14 is concentrically provided in the longitudinal direction Y-Y of the intake passage 11, and the small venturi 14 is located in the small venturi 14 so as to face the fuel injection passage and at the center of the cross section of the small venturi 14. A fuel collision wall 1 extending along the longitudinal axis direction X-X of 14 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a single-point injection type fuel injection device that injects fuel from a single injector into an intake passage on the engine side of a throttle valve.

[0002]

[Prior art]

 A conventional example of such a single-point injection type fuel injection device is shown in Japanese Utility Model Laid-Open No. 59-163173. Such a conventional example will be described with reference to FIG. Reference numeral 10 designates a throttle body having an intake passage 11 communicating with the engine penetrating vertically, and the intake passage 11 is a plate-like member attached to a shaft 12 rotatably supported by the throttle body 10. The opening / closing control is performed by the throttle valve 13. On the other hand, the intake passage 11A on the engine side of the throttle valve 13 of the throttle body 10 is located concentrically with the center of the intake passage 11A along the longitudinal axis Y-Y of the intake passage 11 and has a smaller diameter than the intake passage 11. The small venturi 14 is formed, and the fuel injected from the injector 15 is injected and supplied into the small venturi 14 through 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, the fuel is supplied into the intake passage 11A from the opening end 14A on the engine side of the small venturi 14, and the fuel supplied from the small venturi 14 into the intake passage 11A is the outer peripheral wall 14B of the small venturi 14. The air-fuel mixture is supplied to the engine while being surrounded by air flowing through the annular gap formed by the inner peripheral wall 11B of the intake passage 11A. As described above, the technique of providing the small venturi 14 in the intake passage 11A and supplying the fuel from the small venturi 14 into the intake passage 11A is to supply the fuel injected from a single injector toward the multiple cylinders of the engine. This is effective in terms of fuel distribution in the single-point injection type fuel injection device.

[0003]

[Problems to be solved by the device]

 The conventional fuel injection device has the following problems. Air and fuel flowing in the intake passage 11A near the open end 14A of the small venturi 14 should 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 open end 14A of the small venturi 14, the airflow is affected by the inclination of the throttle valve 13 in the intermediate opening range of the throttle valve 13 It may 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, looking at the fuel supplied from the opening end 14A of the small venturi 14 into the intake passage 11A, the side facing the fuel injection passage 16 (the left side with respect to the longitudinal axis direction XX of the small venturi 14). ). That is, since the small venturi 14 is arranged concentrically with the intake passage 11A, the inner wall 14C of the small venturi 14 that faces the fuel injection passage 16 is located in the longitudinal axis direction XX of the small venturi 14. This is because the fuel that is located on the left side in the drawing and is 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 prevent this, it is considered that the small venturi 14 is moved to the right side in FIG. 1 and the inner wall 14C of the small venturi 14 is arranged on the longitudinal axis Y-Y of the intake passage 11A. According to this, it is impossible to form a uniform annular passage by the outer peripheral wall 14B of the small venturi 14 and the inner peripheral wall 11B of the intake passage 11. That is, the right-side gap S1 formed by the outer peripheral wall 14B on the right side of the small venturi 14 and the inner peripheral wall 11B on the right side of the intake passage 11 is the outer peripheral wall 14B on the left side of the venturi 14 and the inner peripheral wall 11B on the left side of the intake passage 11. It becomes smaller than the gap S2 on the left side formed by and the uniform air cannot flow to the outer circumference of the small venturi 14, and the air is evenly distributed to the fuel supplied from the opening end 14A of the small venturi 14. It is difficult to mix them. The present invention has been made in view of the above problems, and in a throttle body in a fuel injection device having a small venturi, an annular passage formed by an outer peripheral wall of the small venturi and an inner peripheral wall of the intake passage is made uniform. In addition to providing a passage for supplying air, it collides with the inner wall of the small venturi and supplies the fuel supplied into the intake passage from the opening end of the small venturi to the center of the intake passage. Along with this, a mixture of air and fuel is uniformly formed to provide the throttle body having excellent distributability to a multi-cylinder engine.

[0004]

[Means for solving the problem]

 According to the present invention, the object is to penetrate the inside by an intake passage toward the engine side, and to arrange the throttle valve rotatably arranged in the intake passage to control the opening area of the intake passage. In a fuel injection device in which a small venturi is formed in the intake passage on the side and fuel is injected and supplied from the injector toward the small venturi, an injector is provided in a small venturi concentrically provided in the longitudinal axis direction of the intake passage. This is achieved by providing a fuel impingement wall that faces the fuel injection passage and is located substantially at the center of the cross section of the small venturi and extends along the longitudinal axis direction of the small venturi.

[0005]

[Action]

 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 evenly, and as a result, the outer periphery of the small venturi is formed. It is possible to flow even air into the air. 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 direction of the small venturi. More fuel can be supplied toward the intake passage. Thus, it becomes possible to uniformly supply the mixture of fuel and air to the intake passage.

[0006]

【Example】

 An embodiment of the throttle body in the fuel injection device according to the present invention will be described below with reference to FIGS. 1 is a longitudinal cross-sectional view of a main part, and FIG. 2 is a horizontal cross-sectional view of the main part taken along the line P-P of FIG. The same reference numerals are used for the same structural parts as in FIG. Reference numeral 14 denotes a small venturi arranged in the intake passage 11A on the engine side of the throttle valve 13, and the longitudinal axis direction XX of the small venturi 14 is the longitudinal axis direction YY of the intake passage 11. Concentric. 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 formed concentrically with the intake passage 11 and 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 air flowing through 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 flows evenly into the intake passage 11A. This is because the longitudinal axis direction X-X of the small venturi 14 is arranged concentrically with the longitudinal axis direction Y-Y 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 this fuel collides with the fuel collision wall 1 and then the small venturi. It is supplied from the open end portion 14A of 14 into the intake passage 11A. Here, since the fuel collision wall 1 is formed at the center of the cross section of the small venturi 14 and along the longitudinal axis direction XX of the small venturi 14, the fuel is injected into the central portion of the small venturi 14 (in other words, For example, it can be supplied toward the intake passage 11A from the longitudinal axis direction YY of the intake passage 11. Thus, the fuel supplied from the central portion of the small venturi 14 is mixed with the uniform air flowing through the annular passage R, so that a uniform and uniform air-fuel mixture is formed in the intake passage 11B. It was possible to supply this air-fuel mixture uniformly to each cylinder that constitutes the engine.

[0008]

[Effect of device]

 As described above, according to the present invention, in the small venturi concentrically provided in the longitudinal axis direction of the intake passage, the fuel injection passage of the injector is faced, and the small venturi is substantially at the center in the cross section. Since a fuel collision wall extending along the longitudinal axis of the venturi is provided, the fuel supplied from the opening of the small venturi is mixed with the air that uniformly flows in the intake passage without being deflected. It was possible to supply fuel uniformly to each cylinder that constitutes the engine, and to achieve a marked improvement in engine performance.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view of a main part taken along the line PP of FIG.

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

[Explanation of symbols]

 1 Fuel Collision Wall 10 Throttle Body 11 Intake Path 13 Throttle Valve 14 Small Venturi

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display area F02M 19/08 D 9038-3G 29/00 H

Claims (1)

[Scope of utility model registration request] 1. An intake passage extending toward the engine passes through the inside,
A throttle valve that controls the opening area of the intake passage is rotatably arranged in the intake passage, and a small venturi is formed in the intake passage on the engine side of the throttle valve, and fuel is injected from the injector toward the small venturi. In the fuel injection device for injection and supply, in a small venturi 14 provided concentrically in the longitudinal axis direction Y-Y of the intake passage 11, the fuel injection passage 16 of the injector 15 is opposed and a cross sectional view of the small venturi 14 is provided. A throttle body in a fuel injection device, which is provided with a fuel collision wall 1 which is located substantially at the center and extends along the longitudinal axis direction XX of the small venturi 14.