JPH06173815A - Electromagnetic fuel injection valve - Google Patents

Abstract

PURPOSE:To provide an injector structure wherein breaking of a conductor line in assembling and due to a thermal cycle is prevented and airtightness is secured. CONSTITUTION:In an injector 1 wherein a connector 12 is provided with an O-ring 10 for securing airtightness, connecting performance between the connector 12 and a bobbin 9 is enhanced by a shape of the connector 12 or by application of an adhesive agent to a part of a connector 12 to be embedded into the bobbin 9. Accordingly, the connector 12 is firmly fixed without play to the bobbin 9 around which a conductive wire is wound and breaking of the conductive wire is not caused in assembling of the injector 1 and in variation of environment conditions such as a thermal cycle after assembling. Airtightness of the injector 1 can be secured by a structure wherein the connector 12 is equipped with the O-ring 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic fuel injection valve.

[0002]

2. Description of the Related Art An electromagnetic fuel injection valve is disclosed, for example, in Japanese Examined Patent Publication No.
It is known as disclosed in Japanese Patent No. 071.

In a conventional fuel injection device, a connector of an electromagnetic fuel injection valve (hereinafter referred to as an injector) is partially embedded in a bobbin and has an o-ring which is a fuel sealing mechanism. During assembly after the coil is wound around the bobbin, a force is applied to the connector when the o-ring is inserted into the connector or the terminal is connected, and the conducting wire coiled around the bobbin is pulled. As a result, the conductive wire is disconnected during assembly or due to a heat cycle.

Further, in the existing injector, the entire shape of the connector is plate-like, and the fuel leaking from the connector cannot be completely sealed by the o-ring.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent disconnection of a conducting wire at the time of assembly and at the time of cooling and heating,
Moreover, it is intended to provide an injector structure that ensures airtightness.

[0006]

In order to achieve the above object, the present invention provides an injector having a structure provided with an o-ring for ensuring airtightness in a connector, in which the joining property between the connector and the bobbin is determined by the shape of the connector or the connector. This is improved by applying an adhesive to the portion to be embedded in the bobbin.

[0007]

The connector is firmly fixed to the bobbin around which the conducting wire is wound without rattling, and the conducting wire is not broken even when the environmental conditions such as the cooling / heating cycle during and after assembly of the injector are changed.

Further, the airtightness of the injector can be ensured by providing the connector with an o-ring.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The magnetic circuit of the injector 1 is composed of a fixed iron core (hereinafter referred to as a core) 2, a yoke 3 and a plunger 4. Inside the core 2, a movable part composed of the plunger 4 and the ball valve 5 is pressed against the seat surface 7 of the nozzle 6. The spring 8 and the connector 12 are embedded in the bobbin 9 and fixed to the bobbin 9 without rattling by applying the shape or adhesive of the present invention. The conducting wire 11 for exciting the magnetic circuit is wound around the winding portion 13 at the tip of the connector 12 and wound around the bobbin 9. The coil assembly 14 is inserted into the collar hole 15 of the core 2 and the connector 12
And a coupler (not shown) for attaching fuel to the connector 12, the terminal 20 and the fuel pipe (not shown) of the injector 1 through the gap between the plug 16 press-fitted in the core 2 and the bobbin 9 and the core 2 and for supplying a drive current to the injector 1. It is fixed by an o-ring 10 which prevents leakage to the outside through a gap of a yoke mold 24 formed of a resin for fixing the. A filter 17 is provided on the outer circumference of the yoke 3. A terminal 20 for inputting a driving current from the outside is joined to the connector 12. The load moving portion is integrally formed with a plunger 4, a ball valve 5 and a guide ring 21, and the guide ring 21 is guided by the inner diameter of the core 2. The nozzle 6 is provided with a swirler 19 which guides the ball valve 5 and gives a swirling force to the fuel, and a stopper 18 which regulates the lift amount of the movable valve.

Based on the above structure, the operation of the injection valve will be described. When an electric signal is applied to the coil 11, a magnetic circuit is formed by the core 2, the yoke 3 and the plunger 4, and the plunger 4 is attracted to the 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 7 of the nozzle 6 to open the valve. The fuel is pressurized and adjusted by the fuel pump and the fuel pressure regulator, flows into the inside of the injection valve through the fuel passage 22, and is supplied to the nozzle portion.

The fuel supplied to the nozzle is swirler 19
Is given a swirling force and is injected through the orifice 23.

2 and 3 show the effect of the present invention on the assembly process of the coil assembly 14.

First, in FIG. 2, the conducting wire 11 is wound around the bobbin 9 around the winding portion 13 at the tip of the connector 12 in which the hatched portion 26 is embedded in the bobbin 9.
After securing a predetermined number of windings, the winding end is further wound at the tip of the connector 12 different from the winding portion 13
Wrapped around 3. At that time, the conducting wire 11 has a bridge shape 25 between the connector 12 and the bobbin 9.

Next, as shown in FIG. 3, the connector 12 is formed into a bent coil assembly 14. Here, if the bobbin 9 and the connector 12 have rattling, a force greater than the allowable stress is applied to the bridge-like conducting wire 11 to break the wire. In addition, even if the wire is not broken during assembly, the bridge 25
There is residual stress in the part of, and the wire breaks in the heat cycle. FIG. 4 shows an example of the present invention. (A) is a cross-sectional view of (b), in which the hatched portion 26 is embedded in the bobbin 9 and a part thereof has a plate shape in order to obtain the effect of the present invention. In addition, a portion 27 where an o-ring for ensuring the airtightness of the injector is mounted
The cross-sectional shape of is circular.

FIG. 5 shows another example of the present invention. (A) is a cross-sectional view of (b), in which the shaded portion 26 is embedded in the bobbin 9, and a flat portion 28 is partially provided to obtain the effect of the present invention. In addition, the cross-sectional shape of the portion 27 to which the o-ring for ensuring the airtightness of the injector is attached is circular.

FIG. 6 shows another example of the present invention. Bobbin 9
An adhesive is previously applied to the shaded portion 26 embedded in and the cross-sectional shape is circular, but the same effect as other inventions can be obtained. Note that the airtightness of the injector is ensured o
The cross-sectional shape of the portion 27 to which the ring is attached is circular.

[0017]

According to the present invention, the connector is firmly fixed to the bobbin around which the conducting wire is wound without rattling, and the conducting wire is disconnected even when the environmental conditions such as the cooling / heating cycle during and after the injector assembly are changed. There is nothing to do.

Further, the airtightness of the injector can be ensured by providing the connector with an o-ring.

[Brief description of drawings]

FIG. 1 is a sectional view of an injection valve according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an assembly process of the injection valve of the present invention,
In particular, it is a diagram showing an embodiment in which a part of the portion of the connector embedded in the bobbin is a flat surface.

FIG. 3 is a diagram illustrating an assembly process of the injection valve of the present invention,
It is the figure which bent the connector after winding a continuation wire around the bobbin.

FIG. 4 is a diagram illustrating a connector portion according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating a connector portion according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating a connector portion according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Injection valve, 2 ... Core, 3 ... Yoke, 4 ... Plunger,
9 ... Bobbin, 12 ... Connector, 13 ... Winding part, 20
…Terminal.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Yoshiyuki Tanabe Yoshino Tanabe 2520 Takaba, Katsuta-shi, Ibaraki Hitachi, Ltd. Automotive Equipment Division (72) Inventor Masahiro Soma 2477 Kashima Yatsu Kashima Yatsu, Katsuta-shi, Ibaraki Prefecture Address 3 In Hitachi Automotive Engineering Co., Ltd. (72) Inventor Toru Hirasawa 2520, Takaba, Katsuta City, Ibaraki Pref., Ltd., Automotive Equipment Division, Hitachi, Ltd. (72) Kazushi Miwa 2520, Takaba, Katsuta, Ibaraki Prefecture Co., Ltd. Hitachi, Ltd. Automotive Equipment Division

Claims (2)

[Claims] Claim: What is claimed is: 1. A component (hereinafter, referred to as a connector) connecting a conducting wire of a coil, which is a drive source of an electromagnetic fuel injection valve for supplying fuel to an engine, is attached to a bobbin around which the conducting wire is wound in a coil shape. The connector is embedded, and the connector and a terminal for inputting a drive current from the outside (hereinafter referred to as a terminal) are joined by welding, soldering, bonding, or caulking, and a part of the connector leaks fuel. In order to prevent the o-ring from being attached, in an electromagnetic fuel injection valve in which the central cross-sectional shape of the connector is circular, part or all of the o-ring side of the part embedded in the L-shaped bobbin of the connector. An electromagnetic fuel injection valve, characterized in that the cross-sectional shape of the connector center is other than circular. 2. The electromagnetic fuel injection valve according to claim 1, wherein the bobbin is formed by applying an adhesive to a portion of the connector embedded in the bobbin.