JPH0424143Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a fuel injection device for an internal combustion engine (hereinafter referred to as engine) used in automobiles and the like.

(Prior art) In a conventional fuel injection device having an injector in a throttle body, the injector injects fuel toward the circumference of the throttle valve located downstream of the injector and the inner wall of the bore of the throttle body, as disclosed in Japanese Patent Application Laid-Open No. 114642/1983. In order to achieve this, the injected fuel formed a conical surface. However, such a conical fuel distribution system results in insufficient fuel supply and uneven distribution during idling (the valve edge part on the rising side and the valve edge part on the descending side with respect to the opening of the throttle valve have a large amount of fuel). The disadvantage is that idle operation becomes unstable due to uneven distribution (distribution amount becomes uneven).

(Problem that the invention aims to solve) This invention is designed to solve the problem of the valve edge part perpendicular to the shaft of the throttle valve during idling operation (valve edge part on the rising side and valve edge part on the descending side).
An object of the present invention is to provide a fuel injection device that can sufficiently and evenly supply fuel to the fuel injection device.

(Technical means for solving the problem) In order to solve the above problem, this invention proposes that the ball valve single hole of the fuel injection injector be vertically aligned in the center of the bore above the throttle valve of the throttle body. In a fuel injection device in which a cylindrical cover is attached to the lower end of the injector, the fuel injected from the fuel injection hole of the injector flows along the shaft length of the throttle valve while maintaining strong directionality and velocity. In order to effectively and quickly supply the fuel to the edge of the throttle valve that intersects perpendicularly at the center and to the inner wall surface of the intake passage outside the edge, a hole is placed at the center of the bore of the throttle body in front of the fuel injection hole of the injector of the cover. ,
In order to separate the injected fuel into an inverted Y shape, a two-way flow dividing member with a triangular cross section was installed parallel to the shaft of the throttle valve and in a downwardly diverging shape, and the flow was divided by the two-way flow dividing member. The present invention provides a fuel injection device in which the injected fuel is directed toward the edge portion of the throttle valve during idling and the inner wall surface of the intake passage outside the edge portion.

(Function of the invention) As a result, the present invention can quickly supply fuel to the engine from the edge gap of the throttle valve when the engine is suddenly accelerated from a light load state such as idling, and the fuel supply cylinder A creeping surface that improves distribution and response characteristics, and allows the spray of injected fuel to flow along the inner wall surface of the intake passage even if turbulence occurs for some reason in the intake air during steady operation with the throttle valve half open. As a result, the fuel supply can be stabilized, the distribution to each cylinder can be made uniform, and combustion can be stabilized.

(Description of Examples) This invention will be explained below with reference to FIGS. 1 to 4 showing examples. First, referring to FIG. 2, a single-hole ball valve injector I will be described. A connector 5 is coaxially attached to the upper end of a cylindrical body 6, and an input signal receiving section 1 is disposed on the connector 5.
A cylindrical fixed core 4 is inserted into the inner surface from approximately the center of the body 6 to the upper end of the connector 5, and a bobbin 3 is attached between the fixed core 4 and the body 6 in the upper half of the body 6. A coil 2 is provided. A strainer 19 is inserted into the upper end of the fixed iron core 4. A cylindrical valve seat 12 is inserted into the lower part of the body 6, and a valve seat 16 forming a conical surface is provided at the lower end of the valve seat 12.
It is located at the bottom of the . The inner hole of the valve seat 12 is a slide hole 13, in which a cylindrical slide member 9 is slidably accommodated, and the inside of the slide member 9 is a fuel passage 14. A movable iron core 8 is attached to the upper part of the slide member 9. The upper end of the movable core 8 and the fixed core 4
A gap is provided between the lower end of the . The slide member 9 is provided with a ring groove 9b, into which a stopper 17 is loosely inserted. A cylindrical spring receiving member 18 is inserted into the fixed core 4 below the strainer 19, and a compression spring 7 is inserted between this and the slide member 9. A ball valve 10 is welded to the front end of the slide member 9.
Opening/closing valve 11 by slide member 9 and ball valve 10
is formed. The slide member 9 has a fuel passage 14 and a slide hole 13 immediately above the ball valve 10.
A fuel hole 20 is provided that communicates with the fuel. An adapter 21 is provided at the lower end of the valve seat 12. The adapter 21 consists of a cylindrical cover 22 attached to the lower end of the valve seat 12 and two rectangular distribution plates 23 and 24 provided at the lower end of the cover 22 and intersecting each other and opening downward. There is.

As shown in FIG. 1, the injector I is mounted vertically within the throttle body 26 at the center of the bore. 27 is the throttle valve,
28 is the throttle shaft and throttle valve 2
At the center of 7. The intersection line 25 of the aforementioned distribution plates 23, 24 coincides with one diameter of the cover 22, which is parallel to the throttle shaft 28. When the engine is idling, the edges 27a and 27b of the throttle valve 27 perpendicular to the shaft 28 are the extension lines 23a and 27b of the distribution plates 23 and 24, respectively, as shown in FIG.
It is located at 24a.

In the above configuration, when the engine is idling, the fuel injected from the fuel injection port 15 of the injector I is transferred to the injected fuel of the adapter 21.
A two-way flow dividing member having a triangular cross section for dividing the flow into a square shape, in this case, distribution plates 23 and 24
The liquid is distributed and guided in equal amounts by the arrows and is injected in the direction of the extension lines 23a and 24a of the distribution plates 23 and 24. The extension lines 23a, 24a are the edge portions 27a, 2 of the throttle valve 27 perpendicular to the throttle shaft 28.
7b, the injected fuel advances toward the edge portions 27a, 27b and the inner wall surface of the throttle body 26 adjacent thereto, as shown in FIG. It is sucked into the engine without delay through the gap with the wall. As a result, idle operation is performed smoothly.

(Effects of the invention) As shown in Fig. 5, this invention allows the injected fuel to reach the edge of the throttle valve when the throttle valve is fully opened in 0.2 seconds, for example during WOT acceleration, from the fully closed state of idling operation. In the conventional case in which the injected fuel was prevented from colliding with the inner wall of the intake passage on the outside of the edge of the throttle valve, the engine torque did not increase immediately, but with the present invention, the injected fuel is made to collide with the inner wall of the intake passage on the outside of the edge of the throttle valve. In this case, the engine torque increases immediately, and thereafter there is no major change in engine operating performance, partly because the amount of fuel injected is large in both the conventional and the present invention.

[Brief explanation of the drawing]

FIG. 1 shows a longitudinal sectional front view of an embodiment of this invention. FIG. 2 shows a longitudinal sectional front view of a single-hole ball valve ejector used in an embodiment of this invention. FIG. 3 shows a view taken along arrow A in FIG. FIG. 4 shows a perspective view of the adapter. FIG. 5 is a waveform diagram comparing the characteristics of the present invention and the conventional embodiment. 21...Adapter, 22...Cover, 23,2
4... Distribution plate, 23a, 23a... Extension line, 25
...Intersection line, 26...Throttle body, 27...
Throttle valve, 27a, 27b...edge portion, 28...throttle shaft, I...ball valve single hole injector.

Claims (1)

[Scope of utility model registration request] In a fuel injection device in which a single ball valve hole of a fuel injection injector is arranged vertically in the center of a bore above the throttle valve of a throttle body, and a cylindrical cover is attached to the lower end of the injector, the injector's fuel The fuel injected from the injection hole maintains strong directionality and velocity and is effectively and quickly applied to the edge of the throttle valve, which is perpendicular to the longitudinal center of the shaft of the throttle valve, and to the inner wall surface of the intake passage outside the edge. In order to distribute the injected fuel in an inverted Y shape, a two-way flow dividing member having a triangular cross section is installed at the center of the bore of the throttle body in front of the fuel injection hole of the injector of the cover. is installed parallel to the shaft of the throttle valve in a downwardly diverging shape, and the injected fuel divided by the two-way flow dividing member flows between the edge portion of the throttle valve at idle and the inner wall surface of the intake passage outside the edge portion. A fuel injection device characterized in that the fuel injection device is configured to direct.