JP2002013659A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve magnetic efficiency and responsiveness of a solenoid valve for controlling a fluid. SOLUTION: After primary molding of a coil bobbin 6, axially one end part of a stator core 13 is calked to an annular part 62 of a yoke 11, brim-shaped parts 41, 42, which are axially both end parts of the coil bobbin 6 winding a coil 5 by a prescribed number of turns on the external periphery of a guide part 40, are constituted so as to be interposed by the other end face of the annular part 62 of the yoke 11 and one end face of an annular magnetic plate 12, by applying a secondary molding, including a piece 7 regulating an axially moving distance of a valve element 4, a housing 9 of a solenoid valve 1 for controlling of a fluid is integrally resin molded. At this time, the internal peripheral part of the magnetic plate 12, placed in an exposed condition, is held fixedly between the housing 9 and the brim-shaped part 42 of the coil bobbin 6. In this way, a molded resin is prevented from being interposed between the magnetic plate 12 and a moving core 10, both the plate and core can be adjacently arranged, so that improvement of magnetic efficiency can be made.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a fluid control solenoid valve for adjusting a flow rate of a control fluid such as air, and more particularly to a structure in which fuel vapor evaporated from a fuel tank of a vehicle is released to the atmosphere. The present invention relates to a fluid control solenoid valve which is used by being connected to a canister which is a component of a vaporized fuel evaporation prevention device for preventing fuel vapor.

[0002]

2. Description of the Related Art Many of the fluid control solenoid valves disclosed in the prior art, such as Japanese Patent Application Laid-Open No. 9-170675, use a magnetic material made of a magnetic material when assembling each component of the fluid control solenoid valve. The plate is disposed in advance with a coil bobbin and resin integral molding, and one end of a fixed iron core (stator core) made of a magnetic material is caulked to the inner peripheral portion of a yoke made of a magnetic material to form a magnetic circuit. An assembling method of holding and fixing by molding is adopted.

[0003]

However, in the conventional fluid control solenoid valve, since the magnetic plate is previously molded integrally with the coil bobbin and the resin, the magnetic plate is moved between the magnetic plate and the movable iron core (moving core). A molding resin having a certain thickness is always interposed in the formed side gap portion. As a result, the radial distance between the magnetic plate and the moving core is increased, which causes a problem that magnetic efficiency and responsiveness are reduced.

At the same time, in the configuration of the above-mentioned conventional solenoid valve for fluid control, a stator core is fitted into the inner periphery of the coil bobbin, and a distal end of the stator core is made of a non-magnetic material that regulates the axial movement distance of the valve body. Therefore, the moving core could not be arranged close to the axial center of the coil. As a result, it is not possible to secure a lap portion between the coil and a part of the moving core in the axial direction, so that the axial dimension of the fluid control solenoid valve itself becomes large, and the axial size of the fluid control solenoid valve is increased. However, there is a problem that the size becomes large.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a solenoid valve capable of improving magnetic efficiency and responsiveness. Another object of the present invention is to provide a solenoid valve capable of reducing the size in the axial direction.

[0006]

According to the first aspect of the present invention, the outer peripheral surface of the movable iron core and the magnetic member which are arranged opposite to one end face in the axial direction of the fixed iron core via the air gap in the axial direction. The outer peripheral surface of the movable iron core and the inner peripheral surface of the magnetic member are disposed close to each other in the radial side gap portion formed between the inner peripheral surface of the movable core and the radially side gap formed between the outer peripheral surface of the movable core and the molding resin used for resin molding of the coil bobbin. Therefore, the magnetic efficiency and the response can be improved.

According to the second aspect of the present invention, the one end of the fixed core and a part of the movable core in the axial direction are arranged close to the axial center of the coil bobbin, so that the axial direction of the coil and the movable core is adjusted. Since a lap portion with a part of the solenoid valve can be secured, the axial dimension of the solenoid valve itself can be reduced, and the physical size of the solenoid valve in the axial direction can be reduced.

According to the third aspect of the present invention, at the time of resin integral molding, the terminal wires at both ends of the coil and the external connection terminals are insert-molded, so that the terminal wires at both ends of the coil and the external connection terminals are molded. Can be protected.
According to the fourth aspect of the invention, the coil, the coil bobbin, the magnetic member, and the fixed iron core are insert-molded at the time of integrally molding the resin, whereby the waterproofness of the coil can be improved.

According to the fifth aspect of the present invention, the restricting member for restricting the axial movement distance of the valve body and the housing are formed by resin integral molding, so that the valve element side end surface of the restricting member and the valve body are formed. , The axial distance between the valve element-side tip surface of the regulating member and the valve seat, and the axial air gap between the axial one end surface of the movable core and the axial other end surface of the fixed iron core. Can be ensured with high accuracy. And since the regulating member is provided integrally with the housing,
Since the distance can be accurately secured by one component, the number of components can be reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIG. 1 to FIG. 3 show an embodiment of the present invention, and FIG. 1 is a diagram showing a schematic configuration of an apparatus for preventing evaporation of fuel vapor.

The fluid control solenoid valve 1 according to the present embodiment uses a canister 102 to take in vaporized fuel (evaporation gas) vaporized (evaporated) in a fuel tank 101 of a vehicle such as an automobile, and to inhale an internal combustion engine (for example, a gasoline engine). It is used in an evaporative fuel evaporation prevention device that prevents the evaporative fuel from being released into the atmosphere by introducing (purging) the negative pressure into the pipe 103. Here, the evaporative fuel evaporation prevention device will be briefly described with reference to FIG.

In this embodiment, the fuel tank 101 and the canister 102 communicate with each other through the pipe 104, and the canister 102 and the intake pipe 103 are connected to the pipe 1 by the pipe 1.
05. A pressure sensor 106 for detecting a pressure change is connected to the pipe 104. Note that an adsorbent (not shown) such as, for example, activated carbon for adsorbing the evaporated fuel is accommodated in the canister 102.

An open-to-atmosphere opening (not shown) of the canister 102 has an open-to-atmosphere pipe 10 open to the atmosphere.
7 is connected. A canister control valve 108, which is a normally-open electromagnetic on-off valve for closing the atmosphere opening hole as required, is provided in the middle of the atmosphere opening pipe 107. Further, a fluid control solenoid valve (purge control valve) 1 for adjusting the purge amount of the fuel vapor is connected in the middle of the pipe 105.

Then, the leak check of the evaporated fuel generated from the fuel tank 101 and the pipes 104 and 105 communicating with the fuel tank 101 in the evaporated fuel evaporation preventing device is performed in the following order. The atmosphere opening pipe 107 of the canister 102 is closed by the canister control valve 108. Then, by opening the fluid control solenoid valve 1 to introduce a negative pressure from the intake pipe 103 to the pipes 104 and 105, the fluid control solenoid valve 1 is closed to completely shut off the fuel vapor. Then, after a predetermined time has elapsed, the pressure sensor 106 measures whether or not the pressure has increased, thereby performing a leak check of the evaporated fuel.

Next, the configuration of the fluid control solenoid valve 1 of the present embodiment will be described with reference to FIGS. Here, FIG.
FIG. 3 is a view showing the overall structure of the fluid control solenoid valve 1, and FIG. 3 is a view showing the main structure of the fluid control solenoid valve 1.

The fluid control solenoid valve 1 is a normally-closed electromagnetic on-off valve, and generates a magnetomotive force when energized by a valve body 4 seated or separated from a valve seat 3 of a seat valve 2. A coil bobbin 6 for winding the coil 5 integrally formed with a resin, a regulating member (piece) 7 made of molded resin for regulating an axial moving distance of the valve body 4, and a coil bobbin 6. And a first housing (hereinafter abbreviated as a housing) 9 integrally formed of resin and including the piece 7.

A movable iron core (moving core) 10 made of a magnetic material is provided in the housing 9 so as to be movable in the axial direction. Further, a yoke 11 made of a magnetic material, a magnetic plate 12 made of a magnetic material, a fixed iron core (stator core) 13 made of a magnetic material, and the like are held and fixed to the housing 9.

The seat valve 2 is integrally molded in a predetermined shape with a molding resin such as polybutylene terephthalate (PBT), and forms a fluid passage 20 between and inside the housing 9 through which a control fluid such as air flows. Second
A substantially cylindrical filter 14 is provided inside the housing.
Are arranged. This filter 14 is provided in the inflow passage 2
Control fluid such as air flowing from 2 can pass through,
It captures foreign matter mixed in the control fluid to prevent foreign matter from entering the intake pipe 103 of the engine.

On the upstream side of the seat valve 2, a substantially cylindrical inlet pipe 15 connected to the canister 102 via a pipe 105 is integrally formed. On the downstream side of the seat valve 2, a pipe 105 is provided. A substantially circular outlet pipe 16 which is connected to the intake pipe 103 via a through hole is integrally formed. An O-ring groove 18 in which an O-ring 17 as a sealing material for preventing a control fluid from leaking from between the pipe 105 and the outlet pipe 16 is formed on the outer periphery of the distal end of the outlet pipe 16. I have.

The other end in the axial direction of the seat valve 2 is open, and a substantially disk-shaped cap 19 is attached so as to close the opening. The cap 19 is made of, for example, polybutylene terephthalate (PB
T) or the like, and is integrally molded with resin. The fluid passage 20 of the present embodiment moves from the upstream side to the downstream side,
It comprises an inflow port 21, an inflow passage 22, a chamber 23, a fluid passage 24, a valve hole 25, a fluid passage 26, an outflow passage 27, an outflow port 28, and the like.

A volume 29 is formed around the filter 14 of the seat valve 2 to attenuate the pulsation of the control fluid when the valve body 4 is seated on the valve seat 3. The volume 29 has a substantially cylindrical outer wall portion 31 and a middle wall portion 3 integrally formed on the other end surface of the seat valve 2.
2. An inner wall portion 33 and a substantially cylindrical standing wall portion 34 integrally formed on one end surface of the cap 19 and inserted between the middle wall portion 32 and the inner wall portion 33.

An annular fitting surface 36 is formed at one end (fitting portion 35) in the axial direction of the seat valve 2 to be fitted in a liquid-tight manner with the other end surface in the axial direction of the housing 9. I have. On the inner peripheral side of the fitting surface 36, an annular projection 30 projecting toward one end from the fitting surface 36 is formed.
The valve seat 3 is formed in an annular shape at the opening end of the fluid passage 24 (valve hole 25) of the seat valve 2. And
The valve seat 3 is provided at one end surface of the seat valve 2 in the axial direction.
It is installed at a position recessed by a predetermined axial dimension from the fitting surface 36.

The valve element 4 is made of a rubber-based elastic material such as silicon rubber, for example, and a return spring 8 is disposed between the valve element 4 and the piece 7. The valve body 4 is a seat valve 2
A leaf spring (support member) arranged to partition an internal space formed between one end face in the axial direction of the housing 9 and the other end face in the axial direction of the housing 9 into the fluid passage 26 and the spring chamber 37.
38.

The outer periphery of the leaf spring 38 is held and fixed by a packing 39 sandwiched between one end surface of the projection 30 of the seat valve 2 and the other end surface of the housing 9 in the axial direction. The packing 39 is made of, for example, a rubber-based elastic material such as silicon rubber. And return spring 8
Is a biasing means for biasing the valve element 4 and the moving core 10 in a direction of sitting on the valve seat 3.

The coil 5 is an electromagnetic solenoid that generates a magnetomotive force when energized. The coil 5 is wound around the guide portion 40 of the coil bobbin 6 a predetermined number of times, and is coated with an insulating film such as polyester on the surface of a conductor such as copper. It has a circular cross section. Terminal wires (lead wires) at both ends of the coil 5
Is electrically connected to a pair of external connection terminals (terminals) 65 connected to an external power supply, for example, by caulking or welding.

The coil 5, the lead wires at both ends of the coil 5, and a part of the pair of terminals 65 are insert-molded in the housing 9 to protect and waterproof the connection portion. The illustrated upper end portions (tip portions) of the pair of terminals 65 are exposed from the illustrated upper end surfaces of the housing 9 and function as connector pins that are inserted into the female connector portion on the external power supply side to make electrical connection. I do.

The coil bobbin 6 is formed integrally with a resin such as polybutylene terephthalate (PBT) into a predetermined shape by a molding resin, and has a cylindrical guide portion 40 around which the coil 5 is wound and held. A holding member is configured. At both ends of the guide portion 40 in the axial direction,
A pair of flange portions 41 and 42 are provided so as to protrude radially outward from both ends of the guide portion 40. The flange portions 41 and 42 are winding portions for regulating the axial dimension of the coil 5 when the coil 5 is wound around the guide portion 40 a plurality of times. Convex and concave portions 43 and 44 are formed in the pair of flange portions 41 and 42 in the circumferential direction so as to be firmly connected and held to the inner peripheral portion of the housing 9.

The piece 7 is moved from the side wall 45 provided at one end in the axial direction of the housing 9 to the other end in the axial direction (the valve body 4).
Side) in the axial direction. A restricting portion (a valve element-side distal end) 47 that regulates the axial movement distance of the valve element 4 is provided on the distal end side of the piece 7. The restricting portion 47 protrudes toward the valve element 4 from the other end surface of the stator core 13 in the axial direction. The distal end face of the regulating portion 47 is arranged to face the valve body 4 with a predetermined gap therebetween.
The outer peripheral portion of the regulating portion 47 holds one end of the return spring 8 in the axial direction.

The housing 9 is integrally molded in a predetermined shape with a molding resin such as polybutylene terephthalate (PBT), and a side wall 45 at one end in the axial direction.
A connector shell (male connector) that exposes a connector pin at the tip of the terminal 65 at the upper end in the drawing and that is liquid-tightly fitted to a female connector on the external power supply side to enhance waterproofness. 51 are integrally formed. A cylindrical peripheral wall portion 52 that covers the outer periphery of the coil 5 and the coil bobbin 6 is formed integrally with the housing 9. Concave and convex portions 53 and 54 are formed on inner peripheral sides of both ends in the axial direction of the peripheral wall portion 52 so as to fit into the convex and concave portions 43 and 44 of the coil bobbin 6.

The other end of the peripheral wall portion 52 in the axial direction includes
An outer peripheral projection (fitting portion) 55 fitted to the fitting portion 35 of the seat valve 2 is integrally formed. The fitting part 5
The other end face in the axial direction of 5 is disposed to face the fitting face 36 of the fitting portion 35 of the seat valve 2, and has an annular fitting that is fitted to the fitting face 36 of the seat valve 2 in a liquid-tight manner. A mating surface 56 is provided. Further, from the outer periphery of the fitting portion 55, the seat valve 2
An annular portion 57 fitted to the outer periphery of the fitting portion 35 is formed so as to protrude toward the other end in the axial direction. And
On the inner periphery of the fitting portion 55, an annular plate-shaped projection 58 that sandwiches the packing 39 with the projection 30 of the seat valve 2 is formed. One end surface of the projection 58 locks the other end surface of the magnetic plate 12.

The moving core 10 is formed of a ferromagnetic material in a cylindrical shape, and is disposed on the inner periphery of the coil bobbin 6 and the magnetic plate 12 so as to be movable in the axial direction. The moving core 10 is disposed close to the center of the coil bobbin 6 and the center of the coil 5 in the axial direction, and has a wrap portion between a part of the moving core 10 in the axial direction and the coil 5. A predetermined air gap (AG) is formed between one end surface in the axial direction of the moving core 10 and the other end surface in the axial direction of the stator core 13. A predetermined side gap (SG) is formed between the outer peripheral surface of the moving core 10 and the inner peripheral surface of the magnetic plate 12. The other end surface of the moving core 10 in the axial direction is fixed to a leaf spring 38 holding the valve element 4 by using a joining means such as welding.

The yoke 11 is made of a ferromagnetic material and has a cylindrical shape. The yoke 11 has a cylindrical portion 61 disposed on the outer peripheral side of the coil 5 and the coil bobbin 6, and one end in the axial direction of the cylindrical portion 61. It is composed of an annular portion 62 and the like provided. The cylindrical portion 61 is insert-molded on the peripheral wall portion 52 of the housing 9. The annular portion 62 is insert-molded on the side wall 45 of the housing 9.

The magnetic plate 12 corresponds to the magnetic member of the present invention, and is formed of a ferromagnetic material in the shape of an annular plate. The magnetic plate 12 sandwiches the coil bobbin 6 between the magnetic plate 12 and the annular portion 62 of the yoke 11. It is arranged. In addition, the magnetic plate 12 is provided with the flange 4 of the coil bobbin 6.
It is insert-molded between the projection 2 and the projection 58 of the housing 9. The inner peripheral surface of the magnetic plate 12 is disposed facing the outer peripheral surface of the moving core 10 and is exposed from the inner periphery of the coil bobbin 6 and the housing 9.

The stator core 13 is formed in a cylindrical shape from a ferromagnetic material, and is insert-molded between the outer periphery of the piece 7 and the inner periphery of the coil bobbin 6. One end of the stator core 13 in the axial direction is connected to the annular portion 62 of the yoke 11.
Is fixed by caulking. The axial length of the stator core 13 is formed so that the stator core 13 is positioned closer to the center of the coil bobbin 6 and the center of the coil 5 than the flange 42.

Next, a method of manufacturing the fluid control solenoid valve 1 according to the present embodiment will be briefly described with reference to FIGS.

A molding resin such as, for example, polybutylene terephthalate (PBT) is injected into the mold frame from a resin injection port of the first molding die for forming the coil bobbin 6 by an injection molding machine (resin injection means) not shown. by doing,
Perform primary molding (primary molding step). Accordingly, flanges 41 and 42 are provided at both ends in the axial direction of the guide portion 40 having a shape as shown in FIG.
The coil bobbin 6 having the convex and concave portions 43 and 44 on the reference numerals 1 and 42 is integrally molded with resin.

Next, a conductive wire is wound around the outer periphery of the guide portion 40 of the coil bobbin 6 a predetermined number of times to form the coil 5.
The lead wires at both ends of the coil 5 and the pair of terminals 65 are electrically connected. Next, the annular portion 62 of the yoke 11 is caulked at one axial end of the stator core 13, and the flange-shaped portions 41, 42 provided at both axial ends of the guide portion 40 of the coil bobbin 6 are connected to one end surface of the magnetic plate 12. The yoke 11 is assembled so as to be sandwiched between the other end surface of the annular portion 62 (assembly step).

Next, an injection molding machine (resin injecting means) (not shown) is used to form, for example, polybutylene terephthalate (PBT) or the like from the resin injection port of the second molding die for forming the housing 9 into the mold. By injecting the resin, secondary molding including up to the piece 7 is performed (secondary molding step). As a result, as shown in FIG.
Are integrally molded with resin.

At this time, the coil 5, the lead wires at both ends of the coil 5, a part of a pair of terminals 65, the coil bobbin 6, the yoke 11, and the magnetic material are formed on the molding resin (the peripheral wall 52 and the side wall 45 of the housing 9). The plate 12 and the stator core 13 are insert-molded. The inner peripheral surface of the magnetic plate 12 is the coil bobbin 6.
In a state exposed from the inner periphery of the housing 9, it is sandwiched between the flange portion 42 of the coil bobbin 6 and the projection 58 of the housing 9.

[Operation of the Embodiment] Next, the operation of the fluid control solenoid valve 1 of this embodiment will be briefly described with reference to FIGS.

When the coil 5 of the fluid control solenoid valve 1 is energized, a magnetomotive force is generated in the coil 5 and the moving core 1
0, yoke 11, magnetic plate 12, and stator core 13 are magnetized. As a result, the moving core 10 is attracted to the stator core 13 side, so that the leaf spring 38 fixed to the other end of the moving core 10 in the axial direction is provided.
The valve body 4 that operates integrally with the valve body moves leftward in the figure against the urging force of the return spring 8.

As a result, the valve body 4 is
The valve hole 25 is opened by being separated from the valve seat 3 formed at the open end of the fluid passage 24. Therefore, the evaporated fuel in the canister 102 flows into the fluid control solenoid valve 1 through the pipe 105, and the evaporated fuel flows into the inflow port 21 → inflow passage 22 → filter 14 → chamber 23 → fluid passage 24 → valve. The gas flows into the intake pipe 103 through the hole 25, the fluid passage 26, the outflow passage 27, and the outflow port 28, and is sucked into the engine.

[Effects of the Embodiment] As described above, in the fluid control solenoid valve 1 of the present embodiment, the magnetic plate 12 is disposed in the housing 9 by resin molding after the primary molding of the coil bobbin 6. . As a result, the magnetic plate 12 is not integrally formed with the coil bobbin 6 by resin molding, so that the molding resin is formed in the side gap (SG) between the inner peripheral surface of the magnetic plate 12 and the outer peripheral surface of the moving core 10. Can be closely arranged without intervening.

Further, since the moving core 10 can be arranged close to the center of the coil 5 in the axial direction, a lap portion between the coil 5 and a part of the moving core 10 in the axial direction can be secured. Thus, when the coil 5 is energized, the moving core 10 is immediately magnetized. Thereby, the magnetic efficiency can be improved, and the operation of the moving core 10 can be accelerated. That is, the responsiveness can be improved, and the axial dimension of the fluid control solenoid valve 1 itself can be reduced, so that the size of the fluid control solenoid valve 1 in the axial direction can be easily reduced.

A piece 7 for regulating the axial movement distance of the valve element 4 and a housing 9 for surrounding the outer circumference of the coil 5 and the coil bobbin 6 and holding and fixing the yoke 11, the magnetic plate 12 and the stator core 13 are provided. Is formed by resin integral molding. Thereby, the axial position between the distal end surface of the regulating portion (tip on the valve element side) 47 of the piece 7 and the fitting surface 56 of the fitting portion 55 of the housing 9 is determined with high accuracy.

Then, the position of the fitting surface 36 of the fitting portion 35 of the seat valve 2 fitted to the fitting surface 56 of the fitting portion 55 of the housing 9 and the position of the valve seat 3 are accurately determined. As a result, the valve body 4 held by the packing 39 sandwiched between the protrusion 58 provided on the inner periphery of the fitting portion 55 of the housing 9 and the protrusion 30 of the seat valve 2 via the leaf spring 38. The axial distance between the piece 7 and the restricting portion 47 of the piece 7 is determined with high accuracy. Thereby, the axial distance between one end face of the valve element 4 and the restricting portion (tip on the valve element side) 47 of the piece 7, and the axial one end face of the moving core 10 and the axial other end face of the stator core 13. The air gap (AG), which is the distance in the axial direction, can be accurately secured, and the number of parts can be reduced.

[Modification] In the present embodiment, the fluid control solenoid valve 1 of the present invention is used for a device for preventing evaporation of fuel vapor from a vehicle such as an automobile. However, the present invention is not limited to this. It may be used for mounted accessories, air conditioners and the like. As the control fluid, not only air (air) but also a gas such as a gas-phase refrigerant, a liquid such as water or a liquid-phase refrigerant, or a fluid in a gas-liquid two-phase state can be used.

In the present embodiment, the electromagnetic valve 1 for fluid control of the present invention is a normally closed electromagnetic on-off valve, but may be a normally open electromagnetic on-off valve. Further, the lift amount of the valve body 4 from the valve seat 3 may be increased or decreased as the voltage value or the current value to the coil 5 increases.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a schematic configuration of an apparatus for preventing evaporation of fuel vapor (Example).

FIG. 2 is a sectional view showing the entire structure of a fluid control solenoid valve (Example).

FIG. 3 is a sectional view showing a main structure of a fluid control solenoid valve (Example).

[Explanation of symbols]

 Reference Signs List 1 electromagnetic valve for fluid control 2 seat valve 3 valve seat 4 valve body 5 coil 6 coil bobbin 7 piece (restriction member) 8 return spring 9 housing 10 moving core (movable iron core) 11 yoke 12 magnetic plate (magnetic member) 13 stator core ( (Fixed iron core) 24 Fluid passage 25 Valve hole 65 Terminal (external connection terminal)

Claims (5)

[Claims] 1. A coil that generates a magnetomotive force when energized; (b) a coil bobbin made of a resin around which the coil is wound; and (c) magnetized by a magnetomotive force generated by the coil. An annular magnetic member; (d) a fixed iron core fitted to the inner periphery of the coil bobbin and magnetized by a magnetomotive force generated by the coil; and (e) provided separately from the coil bobbin, With the inner peripheral surface of the member exposed, while holding and fixing the magnetic member to one end surface in the axial direction of the coil bobbin,
A resin housing for holding and fixing the fixed core on the inner peripheral surface of the coil bobbin; and (f) the magnetic member is disposed so as to face one end surface in the axial direction of the fixed core via an air gap in the axial direction. And a movable iron core disposed to face an inner peripheral surface of the fixed iron core via a radial side gap portion and attracted to the fixed iron core side by a magnetomotive force generated by the coil. 2. The solenoid valve according to claim 1, wherein the fixed core has one end forming the air gap between the fixed core and the movable core, and one end of the fixed core and the movable core. The electromagnetic valve is characterized in that a part in the axial direction is disposed close to the axial center of the coil bobbin. 3. The solenoid valve according to claim 1, wherein terminal wires at both ends of the coil are electrically connected to an external connection terminal, and the housing is configured such that when the resin is integrally molded, An electromagnetic valve, wherein terminal wires at both ends of a coil and the external connection terminal are insert-molded. 4. The solenoid valve according to claim 1, wherein the housing is formed by insert-molding the coil, the coil bobbin, the magnetic member, and the fixed core when integrally molding the resin. A solenoid valve. 5. The solenoid valve according to claim 1, wherein the movable seat is formed by seating or separating from a valve seat formed at an open end of the fluid passage. A valve body that can move in the axial direction integrally with the iron core, wherein the housing is disposed to face the valve seat, and a regulating member that regulates an axial movement distance of the valve body is provided. An electromagnetic valve characterized by being integrally molded with resin.