JPH05209566A - Electromagnetic fuel injection valve - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to prevent electrolytic corrosion inside and outside the injection valve when a conductive fuel such as methanol fuel is used. [Structure] A metal spring 34 is provided between the injection valve 1 and the presser cap 33, so that the engine and the injection valve 1 are electrically connected to each other without deteriorating the tapping sound of the injection valve 1. It is possible to obtain an injection valve without.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fuel injection valve,
In particular, the present invention relates to an electromagnetic fuel injection valve for a fuel injection device that uses a conductive fuel.

[0002]

2. Description of the Related Art In a conventional fuel injection device, a fuel injection valve is held and fixed by an elastic material such as rubber in the intake passage for sealing fuel and air and for holding the injection valve. Further, the injection valve and the fuel supply pipe and the metal of the intake passage are held so as not to come into direct contact with each other so that the sound of the injection valve does not sound (see, for example, Japanese Utility Model Laid-Open No. 63-182276). Furthermore, gasoline is used in conventional injectors.

[0003]

In the above-mentioned prior art, since gasoline is used, it is not electrically conductive, and there is no problem that electrolytic corrosion occurs during use. However, since gasoline has problems of air pollution and global warming, in recent years, 0% to 85% of methanol has been used as fuel to respond to alternative fuels, reformed gasoline, and emission regulations.
Measures to mix and use are about to be taken. When this fuel is used, methanol is conductive, so if a potential difference occurs between the injection valve and the fuel supply pipe or intake passage,
An electric current flows between them, so that corrosion occurs in that part, so-called electrolytic corrosion occurs.

An object of the present invention is to prevent corrosion by establishing electrical connection between an injection valve and a fuel supply pipe or engine.
It is to provide a highly reliable fuel injection valve.

[0005]

In order to achieve the above object, a first aspect of the present invention is an electromagnetic fuel injection valve which is mounted on an intake passage of an engine and supplies a conductive fuel to the engine. The fuel injection valve and the elastic means for connecting the engine are provided.

A second aspect of the present invention is a fuel supply pipe provided on an intake passage of an engine, the fuel supply pipe having a supply port connected to a conductive fuel supply source, and a yoke provided on the fuel supply pipe. A pressing cap for fixing the mold and a coil installed in the fuel supply pipe and connected to a terminal provided on the yoke mold are provided, and when an electric signal is applied to the coil, the fuel from the fuel supply pipe is supplied. In an electromagnetic fuel injection valve provided with a fixed iron core having a valve for supplying to the engine, a conductive material made of an elastic body is provided between the holding cap and the fixed iron core.

According to a third aspect of the present invention, the pressing cap and the inside of the fixed iron core are slidably installed via a spring, and after adjusting the spring, they are fixed to the fixed iron core and the valve is attached to the valve. In an electromagnetic fuel injection valve provided with a spring adjuster to be connected, a conducting member made of an elastic body is provided between the pressing cap and the spring adjuster.

A fourth aspect of the present invention is the above fuel supply pipe,
What is claimed is: 1. An electromagnetic fuel injection valve, which is installed in the fuel supply pipe and has a case provided with the fixed iron core and the valve therein, comprising: a conducting member made of an elastic body between the fuel supply pipe and the case. Is provided.

According to a fifth aspect of the present invention, the conductive material is made of a material having an elastic conductor resistance of 1 × 10 ⁷ Ω or less.

A sixth aspect of the invention is that the conductive material made of the elastic body is made of either a metal material or a material coated with a conductive material.

In a seventh aspect of the invention, the conductive material made of the elastic body is made of conductive rubber.

[0012]

According to the first aspect of the present invention, it is possible to establish conduction between the fuel injection valve and the engine, it is possible to prevent corrosion of the injection valve even when a conductive fuel is used, and the conduction is provided by the elastic means. Therefore, the tapping sound of the injection valve is not deteriorated.

The fuel supply pipe is fixed to, for example, the engine or the intake passage (intake pipe) with metal screws or bolts, and the injection valve holding cap (hereinafter, holding cap) is attached to the fuel supply pipe with metal screws or bolts. It is fixed. Further, in the injection valve, the case, the fixed iron core, and the spring adjuster are in contact with each other inside the injection valve. The injection valve is an engine,
The intake pipe is held and fixed by the o-ring outside the case, the o-ring of the nozzle portion, the spacer under the case, and the rubber between the fixed iron core and the pressing cap, and is not in direct contact. In this mounting relationship, the second
Between the presser cap and the fixed iron core, between the presser cap and the spring adjuster as in the third invention, and between the case of the injection valve and the fuel supply pipe as in the fourth invention. By providing the conductive material made of elastic material, respectively, conduction is established between the injection valve and the fuel supply pipe or the intake pipe, and the potential difference between the injection valve and the fuel supply pipe caused by the operation of the injection valve and other conditions. Therefore, it is possible to prevent the occurrence of problems such as electrolytic corrosion. Further, as a conductive member, as in the fifth invention, the conductive material of the conductive material made of the elastic body of the second to fourth invention is made of a material having a conductor resistance of 1 × 10 ⁷ Ω or less, By using a metal elastic material such as a spring as in the sixth aspect of the invention or an elastic material such as rubber as in the seventh aspect of the invention, the sound generated from the injection valve is greatly affected. There is no such thing.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The magnetic circuit is composed of a fixed iron core 2, a case 3 and a plunger 4. Inside the fixed iron core 2, a load of a spring 7 for pressing a movable part composed of the plunger 4 and the ball valve 5 against the seat surface 6 of the nozzle 25. There is provided a spring adjuster 8 for adjusting the temperature and an o-ring 9 for preventing the fuel from flowing out from the gap between the fixed iron core 2 and the adjuster 8.
Further, between the fixed iron core 2 and the case 3, the o-rings 11 and 12 for preventing the fuel from flowing out from the gap between the bobbin 10 and the case 3 and the bobbin 10 and the fixed iron core 2 and the magnetic circuit are excited. A coil 13 to be wound around the bobbin 10 is provided. The coil assembly 14 is inserted into the collar hole 15 of the fixed iron core 2, and is inserted between the terminal 16 and the fixed iron core 2.
A collar 19 is provided to prevent the ring 17 and the mold 28 (hereinafter referred to as a yoke mold) outside the injection valve 1 from entering the inside of the injection valve 1 during molding. In the case 3, an o-ring 21 and a fuel passage 2 are provided between the injection valve 1 and a fuel supply pipe 20 having a supply port connected to a conductive fuel supply source.
2. A filter 23, a stopper 24, and
A nozzle 25 having a swirler 26 for guiding the ball valve 5 is attached inside thereof. A terminal 27 for transmitting a signal to the coil and a yoke mold 28 surrounding the terminal 27 and forming a connector portion are provided on the outer circumference of the case. The movable part is integrally formed with the plunger 4, the ball valve 5, and the guide ring 29, and the guide ring 29 is guided by the inner diameter of the fixed iron core 2. A swirler 26 for guiding the ball valve 5 to give a swirling force to the fuel, a nozzle 25 and a fuel supply pipe 2 are provided to the nozzle 25.
An o-ring 30 that seals between 0 is provided. The injection valve 1 is sealed in the fuel supply pipe 20 by o-rings 21 and 30, but in the axial direction, the fixed iron core 2 and the rubber ring 31 above the yoke mold 28 and the insulator 3 are arranged.
It is held down by a presser cap 33 through 2. Further, a metal spring 34 as an elastic means for establishing conduction is attached in the rubber ring 31 while being contracted to less than its free length so as to come into contact with the holding cap 33 and the fixed iron core 2. Here, the presser cap 33
Is fixed to the fuel supply pipe 20 with screws or bolts.
The fuel supply pipe 20 containing the injection valve 1 is fixed to an intake pipe 36, which is an intake passage, with a screw or a bolt via a rubber ring 35.

Next, the operation of the injection valve will be described.
When an electric signal is applied to the coil 13, the fixed iron core 2, the case 3, and the plunger 4 form a magnetic circuit, and the plunger 4 is attracted to the fixed iron core 2 side. The plunger 4 is integrally connected to the ball valve 5, and when the plunger 4 moves, the ball valve 5 also moves and separates from the seat surface 6 of the nozzle 25 and opens. The fuel is pressurized and adjusted by a fuel pump and a fuel pressure regulator, flows from the fuel supply pipe 20 into the inside of the injection valve, and is supplied to the seat portion. The swirler 26 imparts a turning force to the fuel supplied to the seat portion, and the fuel is injected through the orifice 40.

As described above, the injection valve is provided with the spring 3
By making the pressing cap 33 and the fixed iron core 2 electrically conductive by means of 4, it is possible to electrically connect the entire injection valve 1, the fuel supply pipe 20, the intake pipe 36, and the engine. Further, the inside of the injection valve 1 is electrically connected to the fixed iron core 2 and the case 3, the case 3 and the nozzle 25, the fixed iron core 2 and the spring 7, the spring 7 and the plunger 4, and the ball valve 5 and the nozzle 25. There is. Therefore, electrolytic fuel, which is generated when a potential difference is generated between the components using a conductive fuel containing methanol or the like, is unlikely to occur. Further, since an elastic body such as a spring is used as a means for making conduction, the tapping sound inside the injection valve does not resonate significantly.

FIG. 2 shows a metal leaf spring 37, which is located between the pressing cap 33 and the rubber ring 31 and partially contacts the spring adjuster 8 of the injection valve 1 as an elastic means for conducting. Also in the present embodiment, the same effect as in the case of the spring 34 described above can be obtained.

In FIG. 3, a rubber ring 38 between the presser cap 33 and the fixed iron core 2 is used as an elastic means for conduction.
Made of conductive rubber. At that time, the conductive resistance of the conductive rubber is 1 × 10 ⁷ Ω or less. This conductor resistance 1 ×
The value of 10 ⁷ Ω or less is also applied to the above metals.

In FIG. 4, the insulator 32 between the case 3 and the fuel supply pipe 20 is made of conductive rubber.
Even with non-conductive rubber, the same effect can be obtained by applying a conductive coating.

[0020]

According to the present invention, the injection valve can be improved in reliability without increasing its hammering sound and without electrolytic corrosion even when a conductive fuel is used.

[Brief description of drawings]

1 is a cross-sectional view of an injection valve according to an embodiment of the present invention, in particular,
The case where a spring is used as an elastic means for establishing conduction is shown.

FIG. 2 is a cross-sectional view of an injection valve according to another embodiment of the present invention, particularly showing the case where a leaf spring is used as an elastic means for establishing conduction.

FIG. 3 is a cross-sectional view of an injection valve according to another embodiment of the present invention, particularly showing the case where a conductive rubber is used as an elastic means for establishing conduction.

FIG. 4 is a cross-sectional view of an injection valve according to another embodiment of the present invention, particularly showing the case where a conductive rubber is used as an elastic means for establishing conduction.

[Explanation of symbols]

1 ... Injection valve, 2 ... Fixed iron core, 3 ... Case, 4 plunger, 5 ... Ball valve, 7 ... Spring, 8 ... Spring adjuster, 13 ... Coil, 20 ... Fuel supply pipe, 28 ... Yoke mold, 31 ... Rubber Rings, 32 ... Insulators, 33 ... Presser caps, 34 ... Springs (elastic means for conducting), 36 ... Intake pipe (intake passage), 37 ... Leaf springs (elastic means for conducting), 38 ... Rubber rings (for conducting) Elastic means for measuring), 39 ... Insulator (elastic means for measuring conduction).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Ota 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Masahiro Soma Masahiro Soma 2477 Kashimayatsu, Katsuta, Ibaraki Prefecture 3 Hitachi 3 Hitachi Automotive Engineering Co., Ltd.

Claims (7)

[Claims] 1. Installed on an intake passage of an engine,
An electromagnetic fuel injection valve for supplying a conductive fuel to an engine, wherein the electromagnetic fuel injection valve and an elastic means for establishing conduction between the engine and the engine are provided. 2. Installed on an intake passage of an engine,
A fuel supply pipe having a supply port connected to a conductive fuel supply source, a holding cap installed on the fuel supply pipe and fixing a yoke mold, and a fuel supply pipe installed in the fuel supply pipe, and the yoke mold An electromagnetic fuel injection having a coil connected to a provided terminal and a fixed iron core having a valve for supplying fuel from the fuel supply pipe to the engine when an electric signal is applied to the coil. The electromagnetic fuel injection valve according to claim 1, wherein in the valve, a conductive material made of an elastic body is provided between the pressing cap and the fixed iron core. 3. The pressing cap and a spring adjuster which is slidably installed in the fixed iron core via a spring and which is fixed to the fixed iron core after the spring adjustment and is connected to the valve. The electromagnetic fuel injection valve according to claim 1, wherein in the provided electromagnetic fuel injection valve, a conductive material made of an elastic body is provided between the pressing cap and the spring adjuster. 4. An electromagnetic fuel injection valve, comprising: the fuel supply pipe; and a case provided inside the fuel supply pipe, the case including the fixed iron core and the valve, wherein the fuel supply pipe and the fuel supply pipe are provided. The electromagnetic fuel injection valve according to claim 1, further comprising a conductive member made of an elastic body provided between the electromagnetic fuel injection valve and the case. 5. The electromagnetic fuel injection according to claim 1, wherein the conductive material made of the elastic body is made of a material having a conductor resistance of 1 × 10 ⁷ Ω or less. valve. 6. The conductive material made of the elastic body is made of either a metallic material or a material coated with a conductive coating, according to any one of claims 1 to 5. Electromagnetic fuel injection valve. 7. The electromagnetic fuel injection valve according to claim 1, wherein the conductive material made of the elastic body is made of conductive rubber.