JPH0583362U - Electromagnetic fuel injection valve - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the durability of electromagnetic fuel injection valves. [Structure] Valve 1 sliding on the inner wall of valve seat 14
Shoulder portion 32 of the guide portions 30a and 30b provided on the 0a.
A plurality of fuel passage holes 31a and 31b which connect the movable iron core 9 side and the fuel injection port 15 side are provided in a and 32b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic fuel injection valve used in an internal combustion engine, and more particularly to an electromagnetic fuel injection valve having improved durability.

[0002]

[Prior Art]

 FIG. 5 is a vertical cross-sectional view of an example of a conventional electromagnetic fuel injection valve. Fuel flows into the electromagnetic fuel injection valve in the direction of arrow A parallel to the central axis. A foreign matter removing strainer 19 having a filter net 18 is inserted into the fuel inlet port.

A hollow sleeve 2 for supplying fuel, which is also made of a magnetic material, is fitted inside a housing 1 which is made of a magnetic material and has a cylindrical shape. In the space formed between the housing 1 and the sleeve 2, a solenoid coil (hereinafter, simply referred to as a coil) 4 wound around a bobbin 3 is housed so as to surround the sleeve 2. ..

A coil spring 12 and a pipe-shaped spring stopper 13 are inserted into the sleeve 2, and the spring stopper 13 is located at a position where the force of the coil spring 12 that presses the movable iron core 9 is appropriate. It is fixed for 1.

A valve seat 14 having a needle valve (hereinafter, simply abbreviated as “valve”) 10 is disposed at the tip of the housing 1, and the valve seat 14 is caulked together with the nozzle 21 at the open end of the housing 1. Has been.

The valve 10 is regulated by the valve stopper 20 to have a constant reciprocating motion corresponding to the opening degree of the valve. The valve 10 has guide portions 30a and 30b that slide with the inner wall of the valve seat 14 to define the position in the valve seat 14 in the direction perpendicular to the reciprocating motion. Each of the guide portions 30a and 30b is formed by flattening a cylindrical body on four sides, and a fuel passage is provided between the flattened surface and the valve seat 14.

At the rear end of the housing 1, the flange portion 2 a of the sleeve 2 is crimped at the open end of the housing 1. A connector 5 made of a non-magnetic material such as resin is fixed to the upper portion of the flange portion 2a, and a terminal 6 conductively connected to the electromagnetic coil 4 is embedded in the connector 5.

In such a configuration, the movable iron core 9 is pressed by the spring 12 at all times (when the coil 4 is not energized), and fuel injection from the injection port 15 is blocked. FIG. 5 shows a state in which the coil 4 is not energized.

The fuel filtered by the strainer 19 passes through the hollow portion of the sleeve 2 and the central portion of the spring stopper 13, and the gap between the hollow hole of the movable iron core 9 and the guide portions 30 a and 30 b of the valve 10 and the valve seat 14. Is introduced into the space formed by the valve 10 and the valve sheet 14.

When the coil 4 is energized, the movable iron core 9 is attracted to the lower end of the sleeve 2 against the repulsive force of the spring 12, so that the valve 10 separates from the valve seat 14 and the valve seat 14 The fuel supplied to the nozzle 21 is injected from the injection port 15 into the nozzle 21.

[0011]

[Problems to be solved by the device]

 As described above, in the conventional electromagnetic fuel injection valve, since the guide portions 30a and 30b are formed by flattening the cylindrical body on four sides, a sufficient contact area with the inner wall portion of the valve seat 14 is secured. It was not possible, and the surface pressure at the sliding part was high.

Therefore, particularly when a fuel having a low lubricity such as a so-called new composition gasoline containing alcohol is used, sliding wear occurs on the sliding surface, and relatively expensive in order to obtain sufficient durability. There was a problem that different materials had to be used.

An object of the present invention is to solve the above-mentioned problems of the prior art and provide an electromagnetic fuel injection valve having excellent durability without using an expensive material.

[0014]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, a bottom has a mortar-shaped cylindrical recess, and a valve seat having a fuel injection port at the tip of the mortar-shaped bottom, and a cylindrical recess of the valve sheet. In the electromagnetic fuel injection valve, which is slidably accommodated in the side wall surface and has a needle valve whose one end faces the fuel injection port, the needle valve is characterized by the following configuration. (1) The needle valve has a cylindrical guide part that has a longer diameter than the main part and that slides on the side wall of the cylindrical recess of the valve seat, and the shoulder part of the cylindrical guide part is on the movable core side. At least one fuel passage hole communicating with the fuel injection port side is provided. (2) The needle valve has a cylindrical guide part that has a longer diameter than the main part and that slides on the side wall of the cylindrical recess of the valve seat, and the sliding surface of the cylindrical guide part has a movable core. At least one fuel passage groove is provided to connect the side and the fuel injection port side.

[0015]

[Action]

 According to each of the above-mentioned configurations, the contact area at the sliding portion between the cylindrical guide portion of the needle valve and the inner wall of the valve seat can be made large, so that the wear resistance of the needle valve and the valve seat is improved. improves.

[0016]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. Since the electromagnetic fuel injection valve of the present invention is mainly characterized by the structure of the valve 10, it will be described here only with reference to a cross-sectional view around the valve 10.

FIG. 1 (b) is an enlarged cross-sectional view of the main part of the electromagnetic fuel injection valve according to the first embodiment of the present invention, and FIG. 1 (a) is a cross-sectional view taken along line AA of FIG. 1 (b). 5, the same reference numerals as those in FIG. 5 represent the same or equivalent portions.

In the present embodiment, the movable iron core 9 side and the fuel injection port 15 side are communicated with the shoulder portions 32a, 32b of the guide portions 30a, 30b provided on the valve 10a that slides on the inner wall of the valve seat 14. The feature is that a plurality of fuel passage holes 31a and 31b are provided.

With such a configuration, the fuel passage can be secured while the guide portions 30a and 30b are kept in the cylindrical shape, so that the sliding contact between the guide portions 30a and 30b and the inner wall of the valve seat 14 is made. A large area can be taken and abrasion resistance is improved.

FIG. 2B is an enlarged cross-sectional view of the main part of the electromagnetic fuel injection valve according to the second embodiment of the present invention, and FIG. 2A is a cross-sectional view taken along the line BB of FIG. 2B. 5, the same reference numerals as those in FIG. 5 represent the same or equivalent portions.

The present embodiment is characterized in that a fuel supply hole 80 is provided at the center of the valve 10a and fuel is supplied from the fuel discharge hole 81 into the valve seat. According to such a configuration, a sufficient amount of fuel can be supplied through the fuel supply hole 80, so that the applicable range thereof is expanded.

FIG. 3A is a side view of a needle valve according to a third embodiment of the present invention, and FIG. 3B is a sectional view taken along line CC of FIG. Represents the same or equivalent part.

The present embodiment is characterized in that a plurality of V grooves 40a and 40b serving as fuel passages are formed on the sliding surfaces of the guide portions 30a and 30b of the valve 10 along the sliding direction thereof. ..

According to the present embodiment, the contact area can be made wider than in the case where the guide portions 30a and 30b are formed by flattening the four surfaces, so that the contact pressure per unit area is reduced and the wear resistance is reduced. The property is improved.

FIG. 4 (a) is a side view of a needle valve according to a fourth embodiment of the present invention, FIG. 4 (b) is a sectional view taken along the line DD of FIG. Represents the same or equivalent part.

The present embodiment is characterized in that a plurality of U-shaped grooves 50a and 50b serving as fuel passages are formed along the sliding direction on the sliding surfaces of the guide portions 30a and 30b of the valve 10b. is there.

According to the present embodiment, the contact area can be increased as compared with the case where the guide portions 30a and 30b are flattened on the four sides, so that the contact pressure per unit area is reduced and the abrasion resistance is improved. Abrasion is improved.

[0028]

[Effect of the device]

 As is clear from the above description, according to the present invention, since the sliding area between the guide portion of the valve and the side wall surface in the valve seat can be widened, the surface pressure on the sliding surface can be suppressed. This improves the wear resistance of the sliding surface.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a second embodiment of the present invention.

FIG. 3 is a view showing a needle valve according to a third embodiment of the present invention.

FIG. 4 is a view showing a needle valve according to a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view of a conventional technique.

[Explanation of symbols]

10 ... Valve, 14 ... Valve seat, 30a, 30b ...
Guide portions, 31a, 31b ... Fuel supply holes, 32a, 32
b ... Shoulder portion, 40a, 40b ... V groove, 50a, 50b ... U-shaped groove, 80 ... Fuel supply hole

Claims (3)

[Scope of utility model registration request] 1. A valve seat having a mortar-shaped cylindrical recess at the bottom and a fuel injection port at the tip of the mortar-shaped bottom, and a slidable side wall in the cylindrical recess of the valve seat. A needle valve that is housed and has one end facing the fuel injection port and the other end integrated with the movable iron core, and the needle valve displaces the movable iron core with electromagnetic force to open and close the fuel injection port. In the fuel injection valve, the needle valve has a cylindrical guide portion that has a longer diameter than the main portion and that slides on the side wall of the cylindrical recess of the valve seat, and the shoulder portion of the cylindrical guide portion has a An electromagnetic fuel injection valve, comprising: at least one fuel passage hole communicating between the movable core side and the fuel injection port side. 2. A valve seat having a mortar-shaped cylindrical recess at the bottom, and a fuel injection port at the tip of the mortar-shaped bottom; and a side wall surface of the valve seat slidable in the cylindrical recess of the valve seat. A needle valve that is housed and has one end facing the fuel injection port and the other end integrated with the movable iron core, and the needle valve displaces the movable iron core with electromagnetic force to open and close the fuel injection port. In the fuel injection valve, the needle valve has a cylindrical guide portion that has a longer diameter than the main portion and that slides on the side wall of the cylindrical recess of the valve seat, and the sliding surface of the cylindrical guide portion has a cylindrical guide portion. An electromagnetic fuel injection valve comprising at least one fuel passage groove that connects the movable core side and the fuel injection port side. 3. The electromagnetic fuel injection valve according to claim 1, wherein the needle valve includes a fuel passage provided inside from the other end toward one end.