JP4806695B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve composed of a valve portion and a solenoid portion.

  The electromagnetic valve includes a valve portion having a valve body for switching a fluid flow path and a solenoid portion that moves the valve body in a direction in which the valve body is in contact with or separated from the valve seat. In such a solenoid valve, generally, the solenoid part is a hollow bobbin around which an exciting coil is wound, a fixed iron core and a movable iron core accommodated in the bobbin, a magnetic cover in which a bobbin is accommodated, and an exciting coil. And a pair of coil terminals that are electrically connected. The movable iron core is biased in a direction away from the fixed iron core by the return spring. When the exciting coil is energized, the movable iron core is attracted to the fixed iron core against the spring force of the return spring, and the valve body moves in the valve portion and the flow path is switched along with the movement of the movable iron core. It is like that.

  By the way, in the solenoid valve, when the exciting coil is energized, the movable iron core collides with the magnetic pole surface of the fixed iron core, so that there is a problem that the wear of both iron cores is great and the life of the solenoid part is shortened. Therefore, an electromagnetic valve that prevents wear due to collision between iron cores has been proposed (see, for example, Patent Document 1).

  In the solenoid valve of Patent Document 1, the valve body (body) of the valve portion includes a pressure fluid input port, an output port, a discharge port, a supply valve seat positioned between the input port and the output port, and between the output port and the discharge port. A discharge valve seat located at a position, a supply valve chamber provided with a supply valve seat, a discharge valve chamber provided with a discharge valve seat, and a communication hole that connects the supply valve chamber and the discharge valve chamber are formed.

The solenoid part includes a bobbin wound with a coil, a fixed iron core attached to the center hole of the bobbin, a magnetic frame and a magnetic plate surrounding them, a movable iron core slidably inserted into the central hole of the bobbin and the magnetic plate, and a movable iron core It has a return spring. In addition, an annular seal member made of an elastic material is provided between the bobbin and the magnetic plate, and the movable iron core has a central hole in the magnetic plate and a surface on the valve portion side of the seal member. Opposing enlarged diameter portions are provided. Further, the distance between the seal member and the enlarged diameter portion is set to be smaller than the stroke of the movable iron core. And according to the solenoid valve of patent document 1, when a coil is energized, since a diameter-expanded part contacts a sealing member before a movable iron core collides with the magnetic pole surface of a fixed iron core, collision between iron cores is prevented. The wear of both iron cores is prevented.
Japanese Utility Model Publication No. 5-42860

  However, in the electromagnetic valve of Patent Document 1, in order to prevent fluid leakage to the outside of the electromagnetic valve in both the energized state and the non-energized state of the coil, a seal ring is provided between the valve body and the magnetic plate in the solenoid portion. (Seal means) is required. Further, in the electromagnetic valve of Patent Document 1, the seal member (seal means) for preventing wear due to the collision between the iron cores is supplied to the supply valve chamber when the coil is energized when the enlarged diameter portion comes into contact with the seal member. Prevents fluid from leaking into the coil. In addition, in the electromagnetic valve of Patent Document 1, when the enlarged diameter portion is separated from the seal member when the coil is not energized, the fluid remaining in the supply valve chamber passes between the fixed iron core and the bobbin and goes out of the electromagnetic valve. A seal member (seal means) for preventing leakage is required between the fixed iron core and the bobbin. Therefore, although the solenoid valve of patent document 1 made it possible to prevent the iron cores from colliding with each other when the coil is energized, the number of sealing means provided to prevent fluid leakage is increased, and the configuration for preventing fluid leakage is provided. It is complicated.

  An object of the present invention is to provide an electromagnetic valve capable of reducing the wear of both iron cores by reducing the impact of the movable iron core against the fixed iron core while preventing fluid leakage with a simple configuration.

In order to solve the above problems, the invention according to claim 1 is characterized in that the valve body is accommodated in a valve chamber formed in the body, and the valve body is brought into contact with and separated from a valve seat provided in the valve chamber. And a solenoid part that moves the valve body in the direction of contact with and away from the valve seat, wherein the solenoid part is a fixed iron core. A fixed magnetic pole member that supports an exciting coil wound around a shaft portion of the fixed iron core via an insulating member and a fixed magnetic pole member are fixedly provided between bobbins integrally formed at both ends in the axial direction. And a movable iron core housed in the iron core chamber recessed from the mounting surface of the fixed magnetic pole member in the body so as to oppose the magnetic pole surface of the fixed iron core, the fixed magnetic pole member Is the magnetic pole of the fixed iron core A mounting surface to the mounting surface is formed by the end surface of one of the bobbins, and an impact cushioning material is interposed between the mounted surface and the mounting surface, and the solenoid portion is disposed by the impact cushioning material. wherein is partitioned into a movable core and a fixed magnetic pole member, further, the periphery of the iron core chamber at the mounting face seal member for sealing is provided between said mounting surface and shock absorbing material, the magnetic cover The gist is that the fixed magnetic pole member, the shock-absorbing material, the sealing material, and the movable iron core are disposed inside the magnetic cover, extending to a position beyond the mounting surface .

The gist of the invention according to claim 2 is that, in the electromagnetic valve according to claim 1, each of the mounted surface and the mounting surface is formed in a flat surface shape.
The gist of the invention according to claim 3 is that, in the electromagnetic valve according to claim 2, the shock absorbing material is formed in a flat plate shape.

  A fourth aspect of the present invention is the electromagnetic valve according to any one of the first to third aspects, wherein the shock-absorbing material and the sealing material are integrally formed of a rubber material. To do.

  According to the present invention, it is possible to reduce the wear of both iron cores by reducing the impact of the movable iron core against the fixed iron core while preventing fluid leakage with a simple configuration.

Hereinafter, an embodiment of an electromagnetic valve embodying the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIGS. 1 and 2, the electromagnetic valve 11 includes a valve portion 21 having a valve body 27 for switching a fluid flow path and a solenoid portion 41 for moving the valve body 27. .

  First, the valve part 21 in the electromagnetic valve 11 will be described. The valve portion 21 has a body 22 made of a non-magnetic material (made of a synthetic resin material). A supply port P, an output port A, and a discharge port R are formed on one side surface (left side surface in FIG. 1) of the body 22. Positive pressure air is supplied to the supply port P from a positive pressure supply source (not shown) via a pipe, and a pneumatic device (not shown) such as an air cylinder is supplied to the output port A via a pipe. Connected. Further, an exhaust pipe is connected to the discharge port R.

  A plug 29 is attached to the bottom (lower part) of the body 22 via a seal member 13 made of a gasket or an O-ring, and a valve chamber 23 is defined between the body 22 and the plug 29. The body 22 and the plug 29 are formed with a supply passage 24 communicating with the supply port P, and the body 22 is formed with an output passage 25 communicating with the output port A and a discharge passage 26 communicating with the discharge port R. ing. The supply port P communicates with the valve chamber 23 through the supply passage 24, and the discharge port R communicates with the valve chamber 23 through the discharge passage 26. The output port A communicates with the valve chamber 23 through the output passage 25.

  A valve body 27 is accommodated in the valve chamber 23. In addition, a supply valve seat 28a is formed around the opening of the supply passage 24 to the valve chamber 23, and the valve element 27 is in contact with the supply valve seat 28a. It can be separated. The body 22 is an end face facing the valve chamber 23. A discharge valve seat 28b is formed around the opening of the discharge passage 26 to the valve chamber 23, and the valve body 27 is in contact with the discharge valve seat 28b. It can be separated. In the valve chamber 23, a valve return spring 30 is interposed between the valve body 27 and the plug 29, and the valve body 27 is urged away from the supply valve seat 28 a by the spring force of the valve return spring 30. Has been.

  When the valve body 27 is moved away from the supply valve seat 28a by the spring force of the valve return spring 30, the valve body 27 is seated on the discharge valve seat 28b, the supply passage 24 is opened and the discharge passage 26 is opened. Closed. Then, the supply port P and the output port A communicate with each other through the valve chamber 23 and the output passage 25, and the positive pressure air supplied from the positive pressure supply source is supplied from the output port A to the pneumatic equipment. . Further, when the valve element 27 is moved away from the discharge valve seat 28b against the spring force of the valve return spring 30 by the solenoid 41, the valve element 27 is seated on the supply valve seat 28a and the supply passage 24 is closed. And the discharge passage 26 is opened. Then, the output port A and the discharge port R communicate with each other through the valve chamber 23 and the discharge passage 26.

  In the body 22, an iron core chamber 32 is recessed in a surface (upper surface) on which the fixed magnetic pole member 45 of the solenoid unit 41 is mounted, and a flat mounting surface 22 a is formed around the iron core chamber 32. Is formed. In the body 22, a magnetic cover 42 constituting a part of the solenoid portion 41 extends from the periphery of the mounting surface 22 a to a position exceeding the mounting surface 22 a. In the body 22, a guide shaft 31 is provided at a position closer to the iron core chamber 32 (upper side) than the valve chamber 23, and the guide shaft 31 extends into the iron core chamber 32. Therefore, the iron core chamber 32 is formed in an annular shape.

  Next, the solenoid unit 41 will be described. The solenoid unit 41 includes a fixed magnetic pole member 45 fixed inside the magnetic cover 42, and the fixed magnetic pole member 45 is mounted on the mounting surface 22 a of the body 22. The solenoid unit 41 has a movable iron core 33 housed in an iron core chamber 32 in the body 22. The movable iron core 33 is attached to the guide shaft 31. The movable iron core 33 is guided by the guide shaft 31 so as to move along the axial direction of the guide shaft 31.

  An iron core return spring 34 is interposed between the movable iron core 33 and the fixed magnetic pole member 45, and the movable iron core 33 is biased toward the valve chamber 23 by the spring force of the iron core return spring 34. Yes. In addition, the movable iron core 33 is formed with a valve pressing portion 33 a extending toward the valve body 27. When the movable core 33 is urged toward the valve chamber 23 by the iron core return spring 34, the valve element 27 is pressed by the valve pressing portion 33a and pressed against the supply valve seat 28a.

  The fixed magnetic pole member 45 included in the solenoid unit 41 includes a fixed iron core 44 having a rod shape. The fixed iron core 44 is made of a soft magnetic material (metal). The fixed iron core 44 includes a shaft portion 46, a first flange portion 47 a formed on one end side in the axial direction of the shaft portion 46 (upper end side in FIG. 1), and the other end side in the axial direction of the shaft portion 46 ( And a second flange portion 47b formed on the lower end side in FIG. The first flange portion 47a and the second flange portion 47b are formed in an oval shape in plan view, and the shaft portion 46 is formed in an oval shape in a cross-sectional view in a direction orthogonal to the axial direction. The first flange portion 47a has a longer diameter and a shorter diameter than the second flange portion 47b. The shaft portion 46 includes a large-diameter portion 46a located in the central portion in the axial direction, and a small-diameter portion 46b on the flange portions 47a and 47b side from the large-diameter portion 46a in the axial direction of the shaft portion 46. A step 46c is provided at the boundary between 46a and the small diameter portion 46b.

  The fixed magnetic pole member 45 includes a first bobbin 48a made of a synthetic resin material integrally formed on the peripheral surface of the small diameter portion 46b on the first flange portion 47a side (one axial end side of the fixed iron core 44) of the fixed iron core 44. Prepare. The first bobbin 48a is in contact with the inner end surface of the first flange portion 47a on the shaft portion 46 side, and a portion covering the peripheral surface of the small diameter portion 46b is flush with the peripheral surface of the large diameter portion 46a. Is formed. The fixed magnetic pole member 45 includes a second bobbin 48b made of a synthetic resin material integrally formed on the peripheral surface of the fixed iron core 44 on the second flange portion 47b side (the other axial end side of the fixed iron core 44). The second bobbin 48b is formed so that the portion covering the peripheral surface of the small diameter portion 46b is flush with the peripheral surface of the large diameter portion 46a. The first and second bobbins 48 a and 48 b are integrally formed with the fixed iron core 44 by pouring molten resin into a molding die in which the fixed iron core 44 is set.

  The fixed magnetic pole member 45 is an insulating member that covers the entire peripheral surface of the large-diameter portion 46a in the shaft portion 46 and the peripheral surfaces of the first and second bobbins 48a and 48b that cover the peripheral surface of the small-diameter portion 46b. Insulating tape 39 is provided. Further, the fixed magnetic pole member 45 includes an excitation coil 43 wound around the shaft portion 46 via an insulating tape 39 positioned between the first bobbin 48a and the second bobbin 48b. It is supported by the bobbin 48a and the second bobbin 48b.

  The thickness of the insulating tape 39 (thickness along the axial direction of the shaft portion 46) is preferably set to 50 μm or less. If the thickness of the insulating tape 39 exceeds 50 μm, the thickness of the insulating tape 39 becomes too thick, and when the exciting coil 43 is wound around the fixed iron core 44, the fixed magnetic pole member 45 is undesirably enlarged. The fixed magnetic pole member 45 includes a pair of coil terminals 49 fitted into the first bobbin 48 a, and an excitation coil 43 is electrically connected to the coil terminals 49.

  In the fixed magnetic pole member 45 configured as described above, the surface facing the mounting surface 22a of the body 22 is formed in a flat surface shape in which the magnetic pole surface 44a of the fixed iron core 44 and the end surface of the second bobbin 48b are flush with each other. . A mounting surface 45a for mounting the fixed magnetic pole member 45 on the body 22 is formed from the magnetic pole surface 44a of the fixed iron core 44 and the end surface of the second bobbin 48b.

  An impact buffer 50 is interposed between the mounting surface 45 a of the fixed magnetic pole member 45, the mounting surface 22 a of the body 22, and the movable iron core 33. The shock-absorbing material 50 is clamped between the mounted surface 45a and the mounting surface 22a at the same time that the fixed magnetic pole member 45 is fixed to the magnetic cover 42. The solenoid portion 41 is partitioned into a movable iron core 33 on the body 22 side and a fixed magnetic pole member 45 by the shock absorbing material 50. The shock absorbing material 50 is formed in a flat plate shape having a certain thickness from a synthetic resin material. The thickness of the shock absorbing material 50 is appropriately adjusted according to the size of the magnetic circuit (magnetic force) formed around the exciting coil 43. That is, the thickness of the shock absorbing material 50 is appropriately adjusted in order to adjust the returnability (separability from the fixed iron core 44) of the movable iron core 33 to the residual magnetism and leakage current in the solenoid portion 41. For example, when the residual magnetism or leakage current is large, the thickness of the shock absorbing material 50 is increased in order to improve the recoverability. On the other hand, if the thickness of the shock absorbing material 50 is too thin, it is difficult to reduce the impact on the fixed iron core 44 when the movable iron core 33 is attracted to the fixed iron core 44 and collides with the shock absorbing material 50.

  A mounting groove 22b is recessed around the iron core chamber 32 on the mounting surface 22a, and a gasket 51 as a sealing material made of a rubber material is mounted in the mounting groove 22b. The gasket 51 is in close contact with the surface on the mounting surface 22a side of the shock absorbing material 50 and the inner surface of the mounting groove 22b, and seals between the shock absorbing material 50 and the mounting surface 22a to prevent fluid leakage. Yes.

  In the solenoid valve 11 having the above-described configuration, as shown in the right half of FIG. 2, when the exciting coil 43 is not energized, the movable iron core 33 is separated from the fixed iron core 44 by the spring force of the iron core return spring 34. It is arranged. Since the valve element 27 is pressed against the supply valve seat 28a against the spring force of the valve return spring 30 by the valve pressing portion 33a of the movable iron core 33, the supply passage 24 is closed and the output port A and the discharge port R are closed. Are communicated with each other via the valve chamber 23.

  When the exciting coil 43 is energized, an attractive force is generated in the fixed iron core 44 by the magnetomotive force of the exciting coil 43, and the movable iron core 33 resists the spring force of the iron core return spring 34 as shown in the left half of FIG. And sucked into the fixed iron core 44. At this time, since the movable iron core 33 collides with the shock absorbing material 50, it does not directly collide with the magnetic pole surface 44 a of the fixed iron core 44. The valve element 27 is separated from the supply valve seat 28a by the spring force of the valve return spring 30 and seated on the discharge valve seat 28b, the supply passage 24 is opened, and the discharge passage 26 is closed. For this reason, the supply port P and the output port A communicate with each other via the valve chamber 23, and the fluid flow path is switched. At this time, the gasket 51 prevents the fluid to the iron core chamber 32 from leaking out of the solenoid unit 41 and the solenoid valve 11.

  When the exciting coil 43 is deenergized, the movable iron core 33 returns to the initial position by the spring force of the iron core return spring 34. At this time, even if the fluid in the valve chamber 23 leaks to the iron core chamber 32, the gasket 51 prevents the fluid from leaking to the solenoid portion 41.

According to the above embodiment, the following effects can be obtained.
(1) The iron core chamber 32 is recessed from the mounting surface 22a of the body 22, the movable iron core 33 is accommodated in the iron core chamber 32, the fixed magnetic pole member 45 is mounted on the mounting surface 22a of the body 22, and further fixed. The shock absorbing material 50 is interposed between the mounting surface 45 a of the magnetic pole member 45 and the mounting surface 22 a of the body 22. For this reason, the shock-absorbing material 50 is interposed between the movable iron core 33 and the fixed iron core 44. When the movable iron core 33 is attracted to the fixed iron core 44, the movable iron core 33 collides with the shock-absorbing material 50 and moves. 33 is prevented from directly colliding with the magnetic pole surface 44 a of the fixed iron core 44. As a result, the impact of the movable iron core 33 on the fixed iron core 44 when the movable iron core 33 is attracted to the fixed iron core 44 can be reduced, and the wear of both iron cores 33 and 44 can be reduced. Can be improved.

  (2) The shock absorbing material 50 is interposed between the mounting surface 22a of the body 22 and the mounted surface 45a of the fixed magnetic pole member 45, and the solenoid portion 41 is moved by the shock absorbing material 50 to the movable iron core 33 on the body 22 side. And a fixed magnetic pole member 45. Since the body 22 has only the iron core chamber 32 that opens toward the shock-absorbing material 50 and the fluid is present, the impact can be obtained with a simple configuration in which only one gasket 51 is provided around the iron core chamber 32. It is possible to prevent the fluid existing in the valve portion 21 from leaking out of the electromagnetic valve 11 and to the fixed magnetic pole member 45 side by sealing between the buffer material 50 and the mounting surface 22a. Accordingly, unlike the case where a plurality of sealing means are required to prevent fluid leakage to the outside of the solenoid valve or fluid leakage to the coil side as in the background art, the solenoid valve 11 of this embodiment has a simple structure. With this, fluid leakage can be prevented.

  (3) The mounting surface 45a of the fixed magnetic pole member 45 to the body 22 is formed into a flat surface by the magnetic pole surface 44a of the fixed iron core 44 and the end surface of the second bobbin 48b, and the fixed magnetic pole member 45 of the body 22 The mounting surface 22a was formed into a flat surface. The surface sealed by the gasket 51 is the surface on the mounting surface 22a side of the shock absorbing material 50, and the surface on which the movable iron core 33 collides is the same as the surface sealed by the gasket 51 on the mounting surface 22a side of the shock absorbing material 50. Surface. For this reason, the shock absorbing material 50 interposed between the mounting surface 22a and the mounted surface 45a can be formed into a flat plate shape. Therefore, the shock absorbing material 50 can be easily manufactured, and the gasket 51 can be easily brought into close contact with the surface of the shock absorbing material 50 on the mounting surface 22a side, and fluid leakage due to the gasket 51 is surely prevented. be able to.

  (4) An impact buffer 50 is interposed between the magnetic pole surface 44 a of the fixed iron core 44 and the movable iron core 33. For this reason, the magnetic force exerted on the movable iron core 33 can be adjusted by adjusting the thickness of the shock absorbing material 50. Therefore, the returnability of the movable iron core 33 from the fixed iron core 44 can be adjusted by adjusting the thickness of the shock absorbing material 50 without adjusting the number of turns of the exciting coil 43 in the fixed magnetic pole member 45.

  (5) Since the shock absorbing material 50 between the movable iron core 33 and the fixed iron core 44 does not move unlike the diaphragm, the reaction force from the shock absorbing material 50 does not act. Therefore, the urging force of the movable iron core 33 can be set only by the spring load of the iron core return spring 34, and the urging force can be easily adjusted.

  (6) When the shock absorbing material 50 is incorporated in the electromagnetic valve 11, it cannot be visually recognized from outside the electromagnetic valve 11. However, since the shock absorbing material 50 prevents fluid leakage to the outside of the electromagnetic valve 11 together with the gasket 51, the shock absorbing material 50 is incorporated into the electromagnetic valve 11 by confirming the presence or absence of fluid leakage of the electromagnetic valve 11. It can be confirmed whether or not.

  (7) The shaft portion 46 of the fixed iron core 44 includes a large-diameter portion 46a and a small-diameter portion 46b, and each of the first and second bobbins 48a and 48b has a portion that covers each small-diameter portion 46b with a large-diameter portion 46a. It is flush with the surrounding surface. For this reason, the insulating tape 39 can be easily wound around the peripheral surface of the large diameter portion 46a and a part of each small diameter portion 46b.

  (8) The large-diameter portion 46a is formed on the shaft portion 46 of the fixed iron core 44, and the small-diameter portions 46b are formed on both ends of the large-diameter portion 46a in the axial direction of the shaft portion 46, and the large-diameter portion 46a and the small-diameter portion 46b. A stepped portion 46c was formed between the two. When the first and second bobbins 48a and 48b are formed integrally with the fixed iron core 44, the fixed iron core 44 is set in the mold, and a step is formed between the inner peripheral surface of the mold and the peripheral surface of the small diameter portion 46b. The molten resin was poured into the portion 46c, and a part of the first and second bobbins 48a and 48b was formed to be flush with the peripheral surface of the large diameter portion 46a. Therefore, a part of the first and second bobbins 48a and 48b covering each small diameter portion 46b extends from the edge of the insulating tape 39 facing the first and second bobbins 48a and 48b to the large diameter portion 46a side. Yes. For this reason, since the insulating tape 39 covers not only the large-diameter portion 46a of the shaft portion 46 but also part of the first and second bobbins 48a and 48b, the insulating core 39 and the exciting coil 43 are covered by the insulating tape 39. Can be reliably insulated.

In addition, you may change the said embodiment as follows.
As shown in FIG. 3, the impact cushioning material 50 and the gasket 51 may be integrally formed of a rubber material. If comprised in this way, the sealing performance between the shock-absorbing material 50 and the gasket 51 can be ensured.

  The magnetic pole surface 44a of the fixed iron core 44 is at a position that is recessed from the end surface of the second bobbin 48b, a step is formed between the magnetic pole surface 44a and the end surface of the second bobbin 48b, and the mounted surface 45a is flat. It may not be formed.

As an insulating member provided in the fixed iron core 44, a part of the large diameter part 46a and the small diameter part 46b may be covered with a synthetic resin to form an insulating film.
In the valve part 21, the switching method and the number of ports of the valve body 27 may be arbitrarily changed. That is, the switching method of the valve body 27 may be a spool type, and the number of ports may be 2 ports, 4 ports, or 5 ports.

  (1) A valve body that accommodates a valve body in a valve chamber formed in the body, and that can switch a fluid flow path by contacting and separating the valve body with respect to a valve seat provided in the valve chamber; And a solenoid part that moves the valve body in a direction in which the valve body moves toward and away from the valve seat, and the solenoid part is interposed between bobbins integrally formed at both axial ends of the fixed iron core via an insulating member. A method of manufacturing an electromagnetic valve having a fixed magnetic pole member that supports an exciting coil wound around a shaft portion of a fixed iron core, wherein a large diameter portion is formed in the shaft portion of the fixed iron core, and A small-diameter portion is formed on both end sides of the large-diameter portion in the axial direction, and a step portion is formed between the large-diameter portion and the small-diameter portion, and when the bobbin is integrally formed with the fixed iron core, Set the fixed iron core in the mold, and the inner circumference of the mold And a part of each bobbin is formed so as to be flush with the peripheral surface of the large-diameter portion of the shaft portion. Manufacturing method of solenoid valve.

Sectional drawing which shows the solenoid valve of embodiment. Sectional drawing which shows the solenoid valve of embodiment. Sectional drawing which shows the other example which integrated the shock-absorbing material and the gasket.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Solenoid valve, 21 ... Valve part, 22 ... Body, 22a ... Mounting surface, 23 ... Valve chamber, 27 ... Valve body, 28a ... Supply valve seat as valve seat, 28b ... Discharge valve seat as valve seat, 32 DESCRIPTION OF SYMBOLS ... Iron core chamber, 33 ... Movable iron core, 39 ... Insulating tape as an insulating member, 41 ... Solenoid part, 43 ... Excitation coil, 44 ... Fixed iron core, 44a ... Magnetic pole surface, 45 ... Fixed magnetic pole member, 45a ... Mounted surface, 46 ... Shaft portion, 50 ... Shock buffer, 48a ... First bobbin as a bobbin, 48b ... Second bobbin as a bobbin, 51 ... Gasket as a sealant.

Claims (4)

A valve portion that accommodates a valve body in a valve chamber formed in the body, and allows a fluid flow path to be switched by contact and separation of the valve body with respect to a valve seat provided in the valve chamber;
A solenoid valve configured to move the valve body in a direction of moving toward and away from the valve seat,
A fixed magnetic pole member in which the solenoid portion supports an exciting coil wound around the shaft portion of the fixed iron core via an insulating member between bobbins integrally formed on both axial ends of the fixed iron core, and the fixed A magnetic cover on which the magnetic pole member is fixed, and a movable iron core accommodated in the iron core chamber recessed from the mounting surface of the fixed magnetic pole member in the body so as to face the magnetic pole surface of the fixed iron core. And
In the fixed magnetic pole member, a mounting surface to the mounting surface is formed by the magnetic pole surface of the fixed iron core and the end surface of one bobbin, and an impact buffering material is interposed between the mounting surface and the mounting surface. The solenoid is divided into the movable iron core and the fixed magnetic pole member by the shock absorbing material, and the space between the mounting surface and the shock absorbing material is sealed around the iron core chamber on the mounting surface. Sealing material is provided ,
The magnetic cover is an electromagnetic valve that extends to a position beyond the mounting surface, and includes the fixed magnetic pole member, the shock-absorbing material, the seal material, and the movable iron core disposed inside the magnetic cover .   The electromagnetic valve according to claim 1, wherein each of the mounted surface and the mounting surface is formed in a flat surface shape.   The electromagnetic valve according to claim 2, wherein the shock absorbing material is formed in a flat plate shape.   The electromagnetic valve according to any one of claims 1 to 3, wherein the shock-absorbing material and the sealing material are integrally formed of a rubber material.

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