JPH05288130A - Electromagnetic fluid control valve - Google Patents

Abstract

PURPOSE:To shorten the total length of an electromagnetic fuel injection valve. CONSTITUTION:A needle valve 4 which makes connection/disconnection of a fuel passage, a spring 6 which energizes a needle valve 4 to a valve seat 14 and an adjustor 7 which adjusts energizing force, of the spring 6 toward the needle valve 4, are provided in a stator 2 and a housing 1. The adjustor 7 is fixed to a caulking fixed part 27 of the stator 2 after the stator 2 and the housing 1 are connected together by a pipe 8. Next, a solenoid 28 equipped with an electromagnetic coil part 29 and the like formed of an electromagnetic coil 9 and a spool 10 which winds the electromagnetic coil 9 is mounted on the outer circumference of the stator 2. By this procedure, the caulking fixed position of the adjustor 7 comes inside of the stator 2 where the electromagnetic coil part 29 is positioned and the total length of the electromagnetic fuel injection valve can be shortedned so as to implement miniaturization of the mounting space of the injection valve.

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 more particularly to a control valve having a reduced total length.

[0002]

2. Description of the Prior Art An electromagnetic fuel injection valve disclosed in Japanese Patent Publication No. 58-54263 has a valve body and a housing which are crimped to secure a fuel seal.
A step is formed on the valve body. Also, one of the pipes of the non-magnetic member is the stator, the other is the housing,
It is welded or brazed and the fuel is sealed.

After the stator and the housing are connected by this pipe, an electromagnetic coil portion formed of an electromagnetic coil and a spool around which the electromagnetic coil is wound is provided on the outer periphery of the stator. An adjuster is caulked and fixed in the stator above the electromagnetic coil section. The adjuster contacts a spring that biases the needle valve to close it, and adjusts the biasing force of the spring on the needle valve.

On the other hand, in the electromagnetic fuel injection valve disclosed in Japanese Unexamined Patent Publication No. 61-157752, a thread is formed in the stator and an adjusting screw is provided. The adjusting screw abuts on a spring that urges the valve to close, and the urging force of the spring on the valve is adjusted by changing the position in the stator. An electromagnetic coil portion is provided on the outer periphery of the stator where the adjusting screw is located.

[0005]

[Problems to be Solved by the Invention] Japanese Patent Publication Sho 58-5426
The adjuster of the electromagnetic fuel injection valve disclosed in Japanese Unexamined Patent Publication No. 3 is fixed by caulking in a stator protruding above the electromagnetic coil portion. Therefore, there is a problem that the total length of the injection valve cannot be shortened.

On the other hand, in the electromagnetic fuel injection valve disclosed in Japanese Unexamined Patent Publication No. 61-157752, the adjusting screw acting as an adjuster is provided inside the stator provided with the electromagnetic coil portion. It has a relatively short overall length. However, since the threads are formed in the stator, burrs and cuts may occur during the formation or adjustment of the threads, which may cause a malfunction of the injection valve. In addition, there is a problem in that the thread is formed in the stator, which causes a cost.

In view of the above problems, it is an object of the present invention to provide an electromagnetic fluid control valve in which the adjuster is fixed to the stator by simple and reliable caulking and the total length is shortened.

[0008]

In order to achieve the above-mentioned object, the present invention is provided movably in a housing in which a fluid passage is formed, and which connects and disconnects the fluid passage. A valve, a stator connected to the housing, a spring provided in the passage of the fluid for abutting the valve to urge the valve in a closing direction, and after the stator is connected to the housing, An adjuster that forms a caulked portion from the outer circumference of the stator and is caulked and fixed in the stator, and adjusts the biasing force of the spring to the valve; and the outer circumference of the stator after the adjuster is caulked and fixed in the stator And an electromagnetic coil portion that is provided to cover the caulking portion and that drives the valve in the opening direction. The adopted.

[0009]

The function of the present invention will be described. The valve provided in the fluid passage in the housing is urged in the closing direction by the spring and is driven in the opening direction by the electromagnetic force of the electromagnetic coil section. This causes the valve to open and close the fluid passage. An adjuster is caulked and fixed in the stator connected to the housing. This adjuster adjusts the biasing force of the spring on the valve.

After the stator is connected to the housing, the adjuster is caulked and fixed in the stator by the caulking portion formed from the outer circumference of the stator. After this adjuster is caulked and fixed in the stator, the electromagnetic coil section
It is provided on the outer periphery of the stator so as to cover the caulked portion. As a result, the crimping and fixing position of the adjuster is within the stator where the electromagnetic coil portion is located. Therefore, the adjuster is fixed to the stator by simple and reliable caulking, and the total length of the control valve is shortened.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment in which the present invention is applied to an electromagnetic fuel injection valve will be described. FIG. 1 is a vertical sectional view of an electromagnetic fuel injection valve of the first embodiment. Further, FIG. 5 is a cross-sectional view of the tip of the electromagnetic fuel injection valve of the first embodiment.

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

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

Inside the valve body 3, a needle valve 4 is provided.
Is movably provided. In this needle valve 4,
Guide portions 4a and 4b are formed. This guide 4
The needle valve 4 is supported by the valve body 3 by a and 4b. Further, notches are formed in the guide portions 4a and 4b so that fuel can pass between the notches and the valve body 3. Further, the bottom portion of the needle valve 4 is formed in a conical shape. The needle valve 4 connects and disconnects this bottom portion with the valve seat 14 of the valve body 3 to separate the fuel passage in the housing 1.

A cylindrical movable core 5 made of a magnetic material is movably provided in the housing 1. The movable core 5 is integrally connected to the upper portion of the needle valve 4 and moves in the housing 1 together. Further, the movable core 5 is formed with a cutout portion 5a, and the fuel is provided in the cutout portion 5a.
It passes between a and the needle valve 4.

The upper end of the housing 1 is brazed to the pipe 8 made of a non-magnetic member with a seal portion 15a and integrally connected. Further, a tubular stator 2 made of a magnetic material is provided above the pipe 8.

The stator 2 and the pipe 8 have the sealing portion 1 in a state where a part of the stator 2 is inserted into the pipe 8.
They are integrally connected by brazing with 5b. The lower end surface of the stator 2 inserted into the pipe 8 is
It faces the upper end surface of the movable core 5. This stator 2
A solid gap is provided between the lower end surface of the and the upper end surface of the movable core 5 which faces the lower end surface by non-magnetic hard chrome plating or the like. The stator 2 and the movable core 5 are in contact with each other via 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 by an electromagnetic force, which requires a large force to separate them from each other and deteriorates the response time of the injection valve. Further, when the needle valve 4 is in contact with the valve seat 14, the facing distance between the solid gaps is maintained 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 to contact the valve seat 14 of the valve body 3. This spring 6 projects from the inside of the movable core 5 and
It has a total length of up to. A tubular adjuster 7 is caulked and fixed above the spring 6 by a caulking fixing portion 27. Caulking fixing part 2 of this adjuster 7
At 7, the biasing force of the spring 6 on the needle valve 4 is adjusted. Further, above the adjuster 7, a filter 11 for removing foreign matter contained in the fuel is provided.

With the above structure, the fuel serves as the fuel passage, the filter 11 in the stator 2, the adjuster 7,
The movable core 5 passes between the cutout portion 5 a, the needle valve 4 and the valve body 3.

A cylindrical sleeve 17 made of synthetic resin is fitted to the bottom of the outer periphery 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 this hole.
An O-ring 22 is provided above the sleeve 17 to seal between the intake manifold and the injection valve when the injection valve is attached to the intake manifold (not shown). Further, a synthetic resin ring 24 is provided above the O-ring 22. This ring 24 is used for the O-ring 2 when the injection valve is attached to the intake manifold.
It prevents the 2 from slipping and damaging the seal.

A solenoid 28 is provided around the stator 2, the pipe 8 and the housing 1. Below, the electromagnetic coil unit 2 that constitutes this solenoid 28
9, case 18, and connector 20 will be described.

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

A cylindrical case 18 is provided on the outer circumference 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 18 a of the case 18 and the collar portion 1 a 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. A signal for injection control is supplied to this 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 connector 20 made of synthetic resin formed on the upper part of the housing 1.

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

The operation of the electromagnetic fuel injection valve having the above structure will be described. The fuel pressurized to a constant pressure by a fuel pump (not shown) and a pressure regulator passes from the upper portion of the stator 2 through the filter 11 in the stator 2, the adjuster 7, the cutout portion 5a of the movable core 5, and the needle valve 4
Between the valve body 3 and the valve body 3. At this time,
A signal for injection control is supplied to a 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. The electromagnetic force causes the movable core 5 and the needle valve 4 connected to the movable core 5 to move the spring 6
The movable core 5 and the stator 2 collide with each other. At this collision position, the needle valve 4 and the movable core 5 are stagnated by 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 ceases to act, the needle valve 4 descends due to the urging force of the spring 6 and contacts the valve seat 14.

From the gap between the needle valve 4 and the valve seat 14, the fuel is introduced into the hole 1 from the time when the needle valve 4 rises until the time when the needle valve 4 descends.
3, the orifice plate 21, the hole 12, etc., and is injected into an intake manifold (not shown).

Next, the assembling procedure and the fuel injection amount adjusting procedure of the electromagnetic fuel injection valve of this embodiment will be described with reference to FIGS.
Explained by. In FIG. 2, first, the valve body 3
The orifice plate 21 is fixed to the bottom portion of the outer peripheral portion by laser welding. Then, the upper end of the housing 1 and the pipe 8 are fixed by the seal portion 15a by brazing. Then, after inserting the O-ring 16 into the housing 1, the valve body 3 is inserted, and the valve body 3 is fixed at the welded portion 26 by spot welding. The needle valve 4 connected to the movable core 5 is inserted into the valve body 3. Next, the stator 2 is inserted into the pipe 8, and once brought into contact with the movable core 5, the stator 2 is pulled upward by a predetermined distance. Then, the needle valve 4 is pulled up by an electromagnetic coil of an adjusting device (not shown). In this state, the adjusting oil is made to flow in from the stator 2, and the flow rate of 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 facing 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 seal portion 15
At b, the lower end of the stator 2 and the pipe 8 are brazed.

In the present embodiment, the air gap, which is the distance between the magnetic members such as the stator 2 and the movable core 5, is the sum of the lift amount and the solid gap between the stator 2 and the movable core 5. Therefore, when the lift amount and the solid gap are determined, the air gap is also 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, referring to FIG. 3, the spring 6 is inserted into the stator 2 and abutted against the upper side of the needle valve 4, and then the adjuster 7 is attached to the stator 2 at a predetermined position. Then, while adjusting oil is introduced 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 reciprocating motion 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 biasing force of the spring 6 to 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 caulked from the outer periphery by the caulking fixing portion 27 to fix the adjuster 7.

With the above procedure, the adjustment of the dynamic injection amount is completed. As shown in FIG. 4, the filter 11 is connected to the stator 2
Then, 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. Then, by spot welding the lower end portion 18a of the case 18 and the collar portion 1a of the housing 1,
The solenoid 28 is fixed. Further, the O-ring 23 is attached, and the ring 25 is fitted into the upper end portion of the stator 2.
Further, 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.

By the above procedure, the assembling 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 by the pipe 8 and then attaching the solenoid 28,
The adjuster 7 can be positioned before the solenoid 28 is attached. Therefore, the electromagnetic coil portion 29 is provided on the outer circumference 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 overall length of the injection valve can be shortened, and the mounting space for the injection valve can be reduced.

Further, since the adjuster 7 is caulked and fixed from the outer periphery of the stator 2, the adjuster can be fixed easily and surely, 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 abuts the flange when the needle valve is opened is provided inside the housing. The lift amount is determined by the distance until the flange of the needle valve comes into contact with the stopper. However, since the lift amount of the needle valve of the electromagnetic fuel injection valve of the above 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. As a result, 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 circumference of the stator so as to cover the crimp fixing portion of the adjuster. be able to.

Further, after the electromagnetic coil portion and the like are assembled,
In the conventional electromagnetic fuel injection valve in which the adjuster is swaged, the injection valve may have to be discarded if the swaging of the adjuster should fail. However, in the case of the above-described embodiment, the adjuster is swaged before the solenoid 28 is assembled. Therefore, even if the swaging fails, the injection valve before the solenoid 28 is assembled may be replaced. Therefore, the cost can be reduced.

Further, according to the assembling procedure of the above embodiment, the static injection amount and the dynamic injection amount can be determined before the solenoid 28 is assembled. Therefore, by leaving the injection valve before assembling the solenoid 28 as it is, and adjusting the performance and the physique of the solenoid 28, it is possible to provide an injection valve that meets various requirements.

Further, in the above embodiment, the seal portions 15a, 15
By brazing at b, the fuel is sealed and the members are connected. However, the welding is not limited to brazing, and laser welding or electric welding may be used.

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

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

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

[0041]

As described above, according to the present invention, after the stator is connected to the housing, the adjuster is caulked and fixed in the stator by the caulking portion formed from the outer circumference of the stator. After this caulking, the electromagnetic coil portion is attached to the outer periphery of the stator while covering the caulking portion. As a result, the crimping and fixing position of the adjuster is within the stator where the electromagnetic coil portion is located. Therefore, the adjuster can be fixed to the stator by simple and reliable caulking, and the total length of the control valve can be shortened.

[Brief description of drawings]

FIG. 1 is a vertical 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 quantity adjusting procedure of the electromagnetic fuel injection valve of the first embodiment.

FIG. 3 is a sectional view showing an assembly procedure and a dynamic injection amount adjustment 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 cross-sectional view of the tip of the electromagnetic fuel injection valve of the first embodiment.

[Explanation 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 (1)

[Claims] 1. A housing having a fluid passage formed therein, a valve movably provided in the fluid passage and connecting and disconnecting the fluid passage, a stator connected to the housing, A spring provided in the passage and biasing the valve in a closing direction to urge the valve, and after the stator is connected to the housing, a crimp portion is formed from the outer circumference of the stator to crimp the stator. An adjuster that is fixed and that adjusts the biasing force of the spring on the valve; and a direction in which the adjuster is provided on the outer circumference of the stator to cover the caulking portion after the adjuster is caulked and fixed, and the valve is opened. An electromagnetic fluid control valve, comprising: