JP2001082627A - Solenoid type fluid control valve and its manufacturing mathod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assemble a solenoid type fuel injection valve while checking performance of a solenoid. SOLUTION: A stator 2 and a housing 1 constitute a fuel passage part with a pipe to connect them, and a needle valve to interrupt a fuel passage, a spring to energize the needle valve to a valve seat and an adjuster to adjust energizing force to the needle valve of the spring are provided in the inside of it. An electromagnetic coil part 29 made of an electromagnetic coil 9 and a spool 10 to wind the electromagnetic coil 9 around it and a solenoid 28 furnished with a case and a connector 20 are provided on an outer periphery of the stator 2. The fuel passage part is assembled, which the solenoid 28 is assembled and thereafter, the solenoid 28 is assembled on the fuel passage part. In accordance with the above procedure, it is possible to use only what is favorable in performance for assembly by disposing what abnormal before assembling while checking performance of both of them for improving yield in a process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic fluid control valve and a method for assembling the same.

[0002]

2. Description of the Related Art An electromagnetic fuel injection valve disclosed in Japanese Patent Publication No. 58-54363 is provided with a caulking portion between a valve body and a housing in order to ensure a fuel seal.
A step is formed in the valve body. Also, one of the non-magnetic member pipes is in the stator, the other is in the housing,
Welded or brazed and fuel sealed.

After the stator and the housing are connected by this pipe, an electromagnetic coil and a spool around which the electromagnetic coil is wound, a valve casing, a plastic ring, and a plug connection connected to the electromagnetic coil are provided on the outer periphery of the stator. A solenoid to be formed is provided.

As an assembling method, a spool is provided on the outer periphery of a stator, an electromagnetic coil is wound around the spool, and a plug-in connection portion connected to the electromagnetic coil is projected from the spool.
The valve casing is inserted around the stator axial direction, its tip is fixed to the housing by caulking, and a plastic ring is formed so as to bury the plug-in connection. That is, a spool, an electromagnetic coil, a plug-in connection, and a solenoid composed of a plastic ring are sequentially assembled to a fuel passage formed by a stator, a pipe, and a housing.

[0005]

[Problems to be solved by the invention] Japanese Patent Publication No. 58-5426
According to the assembling method disclosed in Japanese Patent Publication No. 3 (1993), a solenoid component is sequentially assembled to a fuel passage formed by a stator, a pipe, and a housing, and the performance must be checked after the entire fuel injection valve is assembled. Then, when an abnormality is found, there is a problem that the entire assembly must be disposed of.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an electromagnetic fluid control valve capable of assembling a fuel injection valve while checking the performance of a solenoid itself.

[0007]

In order to achieve the above object, the present invention provides a housing having a fluid passage formed therein, a valve provided in the fluid passage and intermittently connecting the fluid passage, A pipe connected to one end of the housing, a stator connected to the pipe, a spring provided in the fluid passage, and abutting against the valve to bias the valve in a closing direction; An electromagnetic fluid control valve, comprising: an adjuster for adjusting a biasing force applied to the valve; and a solenoid having a spool, an electromagnetic coil, a case, and a connector while driving the valve in an opening direction. A step of assembling a fuel passage formed by the pipe and the housing; a step of assembling the solenoid; and a step of assembling the solenoid in the fuel passage. Adopt the technical means of the manufacturing method of the electromagnetic fluid control valve and a step of assembling the de.

[0008]

The operation of the present invention will be described. Assemble the fuel passage formed by the stator, pipe, and housing, and assemble the solenoid consisting of the spool, electromagnetic coil, case, and connector, so as to assemble the fuel passage and the solenoid while checking the performance of both. be able to.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of an embodiment in which the present invention is applied to an electromagnetic fuel injection valve will be described. FIG. 1 is a longitudinal sectional view of the electromagnetic fuel injection valve of the first embodiment. FIG. 5 is a sectional view of the tip of the electromagnetic fuel injection valve of the first embodiment.

This electromagnetic fuel injection valve is provided with a housing 1 having a bottomed cylindrical shape and a hole 12 formed at the bottom. As shown in FIG. 5, an orifice plate 21 of a disk member having an orifice 21a formed in the center is provided at the bottom inside the housing 1 acting as a fuel passage. Further, an O-ring 16 for sealing fuel is provided inside the housing 1, and the valve body 3 is provided via the O-ring 16.

In the center of the bottom of the valve body 3, a hole 13 is formed. The hole 12 of the housing 1 and the orifice 21a of the orifice plate 21 form a fuel injection hole. Further, there is provided a valve seat 14 in which the inner peripheral bottom of the valve body 3 is formed in a conical surface shape.

A needle valve 4 is provided inside the valve body 3.
Is movably provided. This needle valve 4 has
Guide portions 4a and 4b are formed. This guide 4
The needle valve 4 is supported on the valve body 3 by a and 4b. Notches are formed in the guide portions 4 a and 4 b, so that fuel can pass between the notches and the valve body 3. The bottom of the needle valve 4 is formed in a conical shape. The needle valve 4 interrupts the fuel passage in the housing 1 by abutting or separating the bottom portion from the valve seat 14 of the valve body 3.

In the housing 1, a movable cylindrical core 5 made of a magnetic material is movably provided. The movable core 5 is integrally connected to the upper part of the needle valve 4 and moves together in the housing 1. The movable core 5 has a notch 5a, and the fuel is supplied to the notch 5a.
a and the needle valve 4.

The upper end of the housing 1 is brazed to a pipe 8 formed of a non-magnetic member by a seal portion 15a, and is integrally connected. Further, a cylindrical stator 2 made of a magnetic material is provided on an upper portion of the pipe 8.

When the stator 2 and the pipe 8 are partially inserted into the pipe 8, the sealing portion 1
They are integrally connected by brazing at 5b. And the lower end surface of the stator 2 inserted into the pipe 8
The upper surface of the movable core 5 is opposed to the upper surface. This stator 2
A solid gap is provided between the lower end face of the movable core 5 and the upper end face of the movable core 5 opposed thereto by applying non-magnetic hard chrome plating or the like. The stator 2 and the movable core 5 come into contact with each other through the solid gap.
Therefore, it is possible to prevent the magnetic material portions of the stator 2 and the movable core 5 from directly contacting each other due to the electromagnetic force, requiring a great deal of force to separate them from each other, thereby deteriorating the response time of the injection valve. When the needle valve 4 is in contact with the valve seat 14, the facing distance between the solid gaps is kept at a predetermined distance.

A spring 6 is provided at the upper end of the needle valve 4 in the movable core 5 to urge the needle valve 4 into contact with the valve seat 14 of the valve body 3. The spring 6 projects from the inside of the movable core 5 and
It has a total length of up to. Above the spring 6, a cylindrical adjuster 7 is caulked and fixed by a caulking fixing portion 27. The caulking fixing part 2 of the adjuster 7
At 7, the urging force of the spring 6 on the needle valve 4 is adjusted. Further, a filter 11 for removing foreign matter contained in the fuel is provided above the adjuster 7.

With the above structure, the fuel flows through the filter 11, the adjuster 7,
The notch 5 a of the movable core 5 passes between the needle valve 4 and the valve body 3.

A cylindrical sleeve 17 made of synthetic resin is fitted into the outer peripheral bottom of the housing 1. A hole is formed in the center of the sleeve 17, and fuel injected from between the needle valve 4 and the valve seat 14 passes through the hole.
An O-ring 22 is provided above the sleeve 17, and seals the space between the intake manifold and the injection valve when the injection valve is attached to an intake manifold (not shown). Further, a ring 24 made of a synthetic resin is provided above the O-ring 22. When the injection valve is mounted on the intake manifold, the ring 24
2 prevents the seal from being damaged.

Here, a solenoid 28 is provided on the outer periphery of the stator 2, the pipe 8, and the housing 1. Hereinafter, the electromagnetic coil unit 2 constituting the solenoid 28 will be described.
9, the case 18, and the connector 20 will be described.

A spool 10 made of synthetic resin is provided on the outer periphery of the stator 2, the pipe 8, and the housing 1. An electromagnetic coil 9 is wound around the spool 10. An electromagnetic coil unit 29 is provided by the spool 10 and the electromagnetic coil 9.

A cylindrical case 18 is provided on the outer periphery of the electromagnetic coil portion 29. The case 18 is formed by pressing a plate material made of a magnetic material. Then, the case 18 is fixed to the housing 1 by spot welding between the lower end portion 18a of the case 18 and the flange portion 1a of the housing 1.

A notch is provided in the upper part of the case 18, and a terminal 19 connected to the electromagnetic coil 9 is taken out from the notch. An injection control signal is supplied to the terminal 19 from an electronic control unit (not shown) via a wire harness. When this signal is sent to the electromagnetic coil 9, the electromagnetic coil 9 generates an electromagnetic force. The terminal 19 is embedded in a synthetic resin connector 20 formed on the upper part of the housing 1.

Further, an O-ring 23 is provided on the upper part of the case 18. When the upper part of the injection valve is connected to a pipe (not shown), the O-ring 23 seals between the injection valve and the pipe. A ring 25 made of a synthetic resin is provided above the O-ring 23. The ring 25 prevents the O-ring 23 from being displaced when the injection valve is connected to a pipe (not shown), thereby impairing the sealing performance.

The operation of the electromagnetic fuel injection valve having the above configuration will be described. The fuel pressurized to a constant pressure by a fuel pump (not shown) and a pressure regulating regulator passes through a filter 11 in the stator 2, an adjuster 7, and a notch 5 a of the movable core 5 from above the stator 2, and passes through the needle valve 4.
And the valve body 3. At this time,
A signal for injection control is supplied to the terminal 19 of the connector 20 from an electronic control unit (not shown). When this signal is sent to the electromagnetic coil 9, the electromagnetic coil 9 generates an electromagnetic force. By this electromagnetic force, the movable core 5 and the needle valve 4 connected to the movable core 5
And the movable core 5 collides with the stator 2. The needle valve 4 and the movable core 5 stay at this collision position due to the electromagnetic force of the electromagnetic coil 9. Then, when the supply of the injection control signal to the electromagnetic coil 9 is stopped and the electromagnetic force stops acting, the needle valve 4 is lowered by the urging force of the spring 6 and comes into contact with the valve seat 14.

The fuel flows from the gap between the needle valve 4 and the valve seat 14 through the hole 1 until the needle valve 4 rises and then descends.
3. The gas passes through the orifice plate 21, the holes 12, and the like, and is injected into an intake manifold (not shown).

Next, the procedure for assembling and adjusting the fuel injection amount of the electromagnetic fuel injection valve of this embodiment will be described with reference to FIGS.
It will be explained by. In FIG. 2, first, the valve body 3
The orifice plate 21 is fixed to the bottom of the outer peripheral portion by laser welding. Then, the upper end of the housing 1 and the pipe 8 are fixed at the seal portion 15a by brazing. After that, the O-ring 16 is inserted into the housing 1 and then the valve body 3 is inserted, and the valve body 3 is fixed at the welding portion 26 by spot welding. The needle valve 4 to which the movable core 5 is connected is inserted into the valve body 3. Next, the stator 2 is inserted into the pipe 8, once brought into contact with the movable core 5, and then pulled up a predetermined distance. Then, the needle valve 4 is pulled up by an electromagnetic coil of an adjustment device (not shown). In this state, the adjusting oil flows from the stator 2 and the flow rate passing through the orifice 21a of the orifice plate 21 from the gap between the needle valve 4 and the valve seat 14, that is, the static injection amount is measured. If the static injection amount deviates from the target value, the position of the stator 2 is changed to adjust the distance between the solid gap of the stator 2 and the solid gap of the movable core 5, that is, the lift amount of the needle valve 4. . Then, if the position of the stator 2 at which the target injection amount is obtained is determined, the sealing portion 15
At b, the lower end of the stator 2 and the pipe 8 are brazed.

In this embodiment, the air gap which is the distance between the magnetic members such as the stator 2 and the movable core 5 is obtained by adding the lift amount and the solid gap between the stator 2 and the movable core 5. Therefore, by determining the lift amount and the solid gap, the air gap is determined at the same time.

The adjustment of the air gap amount, the lift amount, and the static injection amount is completed by the above procedure. Next, in FIG. 3, the spring 6 is inserted into the stator 2, and comes into contact with the upper part of the needle valve 4, and then the adjuster 7 is attached to a predetermined position in the stator 2. Then, while adjusting oil flows in from above the stator 2, the needle valve 4 is reciprocated by an electromagnetic coil of an adjusting device (not shown). The injection amount injected by the reciprocation of the needle valve 4, that is, the dynamic injection amount is measured. If the injection amount deviates from the target value, the position of the adjuster 7 is changed to adjust the urging force of the spring 6 on the needle valve 4. Then, when the position of the adjuster 7 at which the target injection amount is obtained is determined, the stator 2 is swaged from the outer periphery by the swaging fixing portion 27, and the adjuster 7 is fixed.

With the above procedure, adjustment of the dynamic injection amount is completed. As shown in FIG.
After that, the solenoid 28 including the electromagnetic coil portion 29, the case 18, the connector 20, and the like is inserted from above the stator 2. And, by spot welding the lower end portion 18a of the case 18 and the flange portion 1a of the housing 1,
The solenoid 28 is fixed. Further, the O-ring 23 is attached, and the ring 25 is fitted to the upper end of the stator 2.
The ring 24 and the O-ring 22 are attached to the outer periphery of the lower end of the housing 1 and the sleeve 17 is fixed.

With the above procedure, the assembly of the electromagnetic fuel injection valve of this embodiment is completed. As shown in the above procedure, by connecting the stator 2 and the housing 1 with the pipe 8 and then attaching the solenoid 28,
The adjuster 7 can be positioned before the solenoid 28 is attached. For this reason, the electromagnetic coil portion 29 is provided on the outer periphery of the stator 2 so as to cover the caulking fixing portion 27, and the caulking fixing position of the adjuster 7 can be set inside the stator 2 where the electromagnetic coil portion 29 is located. . Therefore, the total length of the injection valve can be reduced, and the mounting space for the injection valve can be reduced.

Also, since the adjuster 7 is fixed by caulking from the outer periphery of the stator 2, the adjuster can be fixed easily and securely, and a low-cost injection valve can be provided. Further, in some conventional electromagnetic fuel injection valves, a flange is provided on the needle valve, and a stopper that comes into contact with the flange when the needle valve is opened is provided in the housing. The lift amount is determined by the distance until the flange of the needle valve contacts the stopper. However, since the lift amount of the needle valve of the electromagnetic fuel injection valve of the embodiment is determined by the distance between the needle valve and the movable core, the stopper and the flange can be eliminated, and the needle valve and the like can be shortened. be able to. Thus, the effect of shortening the overall length of the injection valve can be obtained.

A flange is formed on the needle valve,
Even in the conventional electromagnetic fuel injection valve in which the stopper is provided in the housing, the overall length of the injection valve is shortened by applying the configuration in which the electromagnetic coil portion is provided on the outer periphery of the stator so as to cover the caulking fixed portion of the adjuster. be able to.

After the electromagnetic coil section and the like are assembled,
In the conventional electromagnetic fuel injection valve in which the adjuster is caulked, when the caulking of the adjuster fails, the injector may have to be discarded in some cases. However, in the case of the above embodiment, since the adjuster is caulked before the solenoid 28 is assembled, even if caulking fails, the injection valve before the solenoid 28 is assembled may be replaced. Therefore, cost can be reduced.

Further, the static injection amount and the dynamic injection amount can be determined before assembling the solenoid 28 by the assembling procedure of the above embodiment. Therefore, by maintaining the performance of the solenoid 28 before assembling the solenoid 28 and maintaining the performance, size, etc. of the solenoid 28, it is possible to provide an injection valve meeting various requirements.

In the above embodiment, the seal portions 15a, 15
By brazing at b, the fuel is sealed and the members are connected. However, not only brazing but also laser welding or electric welding may be used.

Further, the housing 1 in the above embodiment is used.
And the valve body 3 may be formed integrally. Alternatively, the valve body 3 may be directly connected to the pipe 8.

In the above embodiment, the present invention is applied to a top feed type electromagnetic fuel injection valve. However, the present invention may be applied to a bottom feed type electromagnetic fuel injection valve. In this case, the adjuster 7 may be a rod-shaped member instead of a pipe.

In the above embodiment, the present invention is applied to the electromagnetic fuel injection valve, but the present invention is not limited to this. For example, in a device in which air is mixed with fuel injected from a fuel injection valve and then injected into an intake manifold,
The present invention may be applied to an air control valve that controls the amount of air mixed with fuel.

[0039]

As described above, according to the present invention, the fuel passage is assembled, while the solenoid comprising the spool, the electromagnetic coil, the case, and the connector is assembled. The part and solenoid can be assembled.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic fuel injection valve according to a first embodiment.

FIG. 2 is a sectional view showing an assembling procedure and a static injection amount adjusting procedure of the electromagnetic fuel injection valve of the first embodiment.

FIG. 3 is a sectional view showing an assembling procedure and a dynamic injection amount adjusting procedure of the electromagnetic fuel injection valve of the first embodiment.

FIG. 4 is an exploded sectional view showing an assembling procedure of the electromagnetic fuel injection valve of the first embodiment.

FIG. 5 is a sectional view of a distal end portion of the electromagnetic fuel injection valve of the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Stator 3 Valve body 4 Needle valve 5 Movable core 6 Spring 7 Adjuster 8 Pipe 9 Electromagnetic coil 10 Spool 27 Caulking fixed part 28 Solenoid 29 Electromagnetic coil part

Claims (2)

[Claims] 1. A housing having a fluid passage formed therein, a valve provided in the fluid passage for interrupting the fluid passage, a pipe connected to one end of the housing, and connected to the pipe. And a spring provided in the fluid passage and abutting against the valve to bias the valve in a direction to close the valve, an adjuster for adjusting a biasing force applied to the valve by the spring, and the valve An electromagnetic fluid control valve that is driven in the opening direction and includes a solenoid having a spool, an electromagnetic coil, a case, and a connector. Assembling a fuel passage formed by the stator, the pipe, and the housing. Producing an electromagnetic fluid control valve, comprising: a step of assembling the solenoid; and a step of assembling the solenoid in the fuel passage portion. Method. 2. An electromagnetic fluid control valve manufactured by the above manufacturing method.