JP4704388B2 - solenoid valve - Google Patents

Description

  The present invention relates to an electromagnetic valve including a main valve portion and a solenoid portion.

  Generally, an electromagnetic valve is composed of a main valve portion having a valve body for switching a flow path, and a solenoid portion that drives the valve body in a direction in which the valve body comes in contact with and separates from the valve seat (for example, Patent Document 1). reference). As shown in FIG. 4, in the electromagnetic valve 80 disclosed in Patent Document 1, the solenoid part (electromagnetic operation part) 81 is accommodated in a hollow bobbin 83 around which an exciting coil 82 is wound, and the bobbin 83. A fixed iron core 84 and a movable iron core 85, a magnetic cover 86 in which the bobbin 83 is accommodated, and a pair of coil terminals 87 that are electrically connected to the exciting coil 82. The movable iron core 85 is biased in a direction away from the fixed iron core 84 by the iron core return spring 93.

  In the electromagnetic valve 80, a housing 88 forming the main valve portion 91 is provided with a supply port 88a, an output port 88b, and a discharge port 88c, and a valve chamber 89 is formed inside the housing 88. Each port 88a, 88b, 88c communicates with the chamber 89. A valve member 90 is accommodated in the valve chamber 89 and a valve seat 92 is provided. The valve member 90 is urged in a direction away from the valve seat 92 by a valve return spring 95. Further, the valve member 90 is pressed against the valve seat 92 via the push rod 94 by the movable iron core 85 urged by the iron core return spring 93. The solenoid valve 80 can switch the flow path by driving the valve member 90 with the solenoid 81.

  That is, when the exciting coil 82 is not energized, the movable iron core 85 is separated from the fixed iron core 84 by the spring force of the iron core return spring 93, and the valve member 90 is moved to the valve seat 92 by the push rod 94 pushed by the movable iron core 85. It is pressed against. For this reason, the supply port 88 a is closed by the valve member 90 and the output port 88 b and the discharge port 88 c communicate with each other via the valve chamber 89.

When the exciting coil 82 is energized from this state, the movable iron core 85 is attracted to the fixed iron core 84 against the spring force of the return spring 93, and at the same time, the push rod 94 moves away from the valve member 90. Then, the valve member 90 moves away from the valve seat 92 by the spring force of the valve return spring 95, the supply port 88a and the output port 88b communicate with each other via the valve chamber 89, and the flow path is switched. It is supposed to be.
JP 2007-10084 A

  In the electromagnetic valve 80, the larger the force pressing the valve member 90 against the valve seat 92, the more reliably the supply port 88a is closed (sealed) by the valve member 90 and the non-output state of the output port 88b is maintained. it can. The force that presses the valve member 90 against the valve seat 92 depends on the spring force of the iron core return spring 93. The greater the spring force of the iron core return spring 93, the stronger the valve member 90 is pressed against the valve seat 92. it can. The spring force of the iron core return spring 93 is determined based on the attractive force of the fixed iron core 84 with respect to the movable iron core 85, that is, the magnetomotive force of the exciting coil 82. This is because if the suction force of the fixed core 84 can be increased, the movable core 85 can be sucked into the fixed core 84 against the spring force of the core return spring 93.

  Further, if the spring force of the iron core return spring 93 can be increased, the valve member 90 is moved to the valve seat 92 by the movable iron core 85 and the push rod 94 even if the spring force of the valve return spring 95 that biases the valve member 90 is increased. Can be pressed against. When the spring force of the valve return spring 95 is increased, when the movable iron core 85 is attracted to the fixed iron core 84, the valve member 90 is quickly moved away from the valve seat 92 by the spring force of the valve return spring 95. be able to. Therefore, in the electromagnetic valve 80, in order to improve the performance in the main valve portion 91, it is desired to improve the attractive force of the fixed iron core 84, that is, to increase the magnetomotive force of the exciting coil 82.

  In the electromagnetic valve 80 disclosed in Patent Document 1, in order to increase the magnetomotive force of the exciting coil 82, it is conceivable to increase the number of turns of the magnet wire forming the exciting coil 82. However, when the number of turns of the magnet wire is increased, the solenoid part 81 is increased in size.

  The present invention can increase the magnetomotive force of the exciting coil and improve the performance of the main valve portion as compared with an electromagnetic valve having an exciting coil wound around a bobbin without increasing the size of the solenoid portion. It is to provide a solenoid valve.

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. The main valve part that enables switching of the flow path by a solenoid part and a solenoid part that drives the valve body in a direction to make contact with and away from the valve seat, and the solenoid part is wound with an exciting coil around a fixed iron core A fixed magnetic pole member, a magnetic cover that surrounds the fixed magnetic pole member and forms an outer portion of a solenoid part, and a movable iron core that can be moved toward and away from the fixed iron core, the fixed iron core comprising a shaft portion and the shaft portion Flange portions provided at both ends of the coil, the shaft portion and the flange portion are covered with an insulating coating portion, and the exciting coil is wound around a fixed iron core via the insulating coating portion . The coating part is the fixed iron After the base treatment is performed, an insulating resin material is formed by film forming, and the flange portion includes a first flange portion provided at an end opposite to the movable iron core and an end on the movable iron core side. A second flange portion provided in a portion, wherein the first flange portion is provided such that a protruding length from the shaft portion is larger than the second flange portion, and in the first flange portion, A surface that is continuous with the peripheral surface of the shaft portion and is orthogonal to the axial direction of the shaft portion is covered with the insulating coating portion, and the insulating coating portion is flush with the peripheral surface of the first flange portion. The peripheral surface of the first flange portion is joined to the inner surface of the magnetic cover, the second flange portion is continuous with the peripheral surface of the shaft portion, and the shaft portion A surface perpendicular to the axial direction and extending in the axial direction of the shaft portion is the insulating member. It is coated with a coating film, and summarized in that the insulating coating film covering the peripheral surface of the second flange portion is to be bonded to the inner surface of the magnetic cover.

The gist of the invention according to claim 2 is that, in the electromagnetic valve according to claim 1, the thickness of the insulating coating portion in the shaft portion is 0.1 to 0.5 mm.

  According to the present invention, the magnetomotive force of the exciting coil is increased and the performance in the main valve portion is improved as compared with an electromagnetic valve having an exciting coil wound around a bobbin without increasing the size of the solenoid portion. Can do.

  Hereinafter, an embodiment of a solenoid valve embodying the present invention will be described with reference to FIGS. 1 is a cross-sectional view of the electromagnetic valve taken along line 1-1 in FIG. 3, and FIG. 2 is a cross-sectional view of the electromagnetic valve taken along line 2-2 in FIG.

  As shown in FIGS. 1 and 2, the electromagnetic valve 11 includes a pilot-type main valve portion 21 having a valve body 27 for switching a fluid flow path, and a solenoid portion 41 for driving the valve body 27. It is configured.

  First, the main valve part 21 side in the solenoid valve 11 will be described. The main valve part 21 has a body 22 made of a non-magnetic material (made of a synthetic resin material). On one side surface of the body 22, a supply port P, an output port A, and a discharge port R are provided. Positive pressure air is supplied to the supply port P from a positive pressure supply source via a pipe, and the output port A is connected to a pneumatic device such as an air cylinder via the pipe. Further, an exhaust pipe is connected to the discharge port R.

  A retainer 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 retainer 29. A supply passage 24 that communicates with the supply port P is formed in the body 22 and the retainer 29, and an output passage 25 that communicates with the output port A and a discharge passage 26 that communicates with the discharge port R are formed in the body 22. Has been. 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 the retainer 29, a supply valve seat 28 a is formed around the opening of the supply passage 24 to the valve chamber 23, which faces the inside of the valve chamber 23. It is possible. The body 22 has an end face facing the valve chamber 23, and a discharge valve seat 28b is formed around the opening of the discharge passage 26 to the valve chamber 23. The valve body 27 can be brought into contact with and separated from the discharge valve seat 28b. It has become. In the valve chamber 23, a valve return spring 30 is interposed between the valve body 27 and the retainer 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. Is 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 positive pressure air is supplied from the output port A to the pneumatic equipment. When the valve element 27 moves away from the discharge valve seat 28b against the spring force of the valve return spring 30, the valve element 27 is seated on the supply valve seat 28a, and the supply passage 24 is closed and discharged. The 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, a guide shaft 31 is provided at a position above the valve chamber 23, and an iron core chamber 32 is defined around the guide shaft 31. A cylindrical movable iron core 33 is disposed in the iron core chamber 32, and 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 guide shaft 31, and the movable iron core 33 is urged toward the valve chamber 23 by the spring force of the iron core return spring 34. 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.

  Next, the solenoid unit 41 will be described. The solenoid portion 41 is in contact with the fixed iron core 44, a fixed magnetic pole member 45 in which an exciting coil 43 is wound around a fixed iron core 44, a magnetic cover 42 that surrounds the fixed magnetic pole member 45 and forms an outer shell of the solenoid portion 41. The movable iron core 33 is separable.

  The solenoid unit 41 will be described in detail. The outer portion of the solenoid part 41 is formed by a rectangular cylindrical magnetic cover 42 made of a magnetic material such as iron. The magnetic cover 42 is integrated with the body 22 when the body 22 is molded in the main valve portion 21. Inside the magnetic cover 42, there is provided a fixed magnetic pole member 45 formed by winding an exciting coil 43 around a fixed iron core 44 through an insulating coating 48. 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 47a formed on one end side in the axial direction of the shaft portion 46, and a second flange portion 47b formed on the other end side in the axial direction of the shaft portion 46. And. As shown in FIG. 3, 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 in an oval shape in sectional view in a direction orthogonal to the axial direction. Is formed. The first flange portion 47a has a longer diameter and a shorter diameter than the second flange portion 47b.

  As shown in FIGS. 1 and 2, in the fixed iron core 44, the entire peripheral surface of the shaft portion 46, and the surfaces of the first flange portion 47 a and the second flange portion 47 b that are continuous to the shaft portion 46 are insulating coating portions 48. It is covered by. In the first flange portion 47 a, a surface that is continuous with the peripheral surface of the shaft portion 46 and is orthogonal to the axial direction of the shaft portion 46 is covered with an insulating coating portion 48. The insulating coating portion 48 is provided up to a position that is flush with the peripheral surface of the first flange portion 47a.

  In the second flange portion 47 b, a surface that is continuous with the peripheral surface of the shaft portion 46, is orthogonal to the axial direction of the shaft portion 46, and extends in the axial direction of the shaft portion 46 is covered with an insulating coating portion 48. Yes. That is, the insulating coating 48 is provided at a position where the stationary iron core 44 and the exciting coil 43 can be insulated when the exciting coil 43 is wound around the stationary iron core 44. The insulating coating 48 is formed by subjecting the peripheral surface of the fixed iron core 44 to a base treatment using a silane coupling agent and then forming a coating of an insulating resin material made of a thermosetting resin such as an epoxy resin. ing.

  The thickness of the insulating coating portion 48 provided on the shaft portion 46 (thickness along the shaft radial direction of the shaft portion 46) is preferably set to 0.1 to 0.5 mm. It is set to 1 to 0.2 mm. If the thickness of the insulating coating 48 does not reach 0.1 mm, it is not preferable because it is difficult to ensure insulation between the fixed iron core 44 and the exciting coil 43. On the other hand, when the thickness of the insulating coating 48 exceeds 0.5 mm, the thickness of the insulating coating 48 becomes too thick, and when the exciting coil 43 is wound around the fixed iron core 44, the fixed magnetic pole member 45 is enlarged. It is not preferable.

  In the insulating coating 48, a pair of coil terminals 49 are fitted on the first flange 47a side. The coil terminal 49 is integrated by inserting the coil terminal 49 into the insulating coating 48 when the insulating coating 48 is formed, and the exciting coil 43 is electrically connected to the coil terminal 49. . Then, a magnet wire is wound around the insulating coating portion 48 with respect to the fixed core 44 coated with the insulating coating portion 48, whereby the exciting coil 43 is wound around the fixed iron core 44, and the fixed magnetic pole member 45 is formed. .

  The fixed magnetic pole member 45 is joined (fixed) to the magnetic cover 42 by laser welding the peripheral surface of the first flange portion 47 a of the fixed iron core 44 to the inner surface of the magnetic cover 42. Therefore, when the excitation coil 43 is energized, a magnetic circuit that passes through the fixed iron core 44 and the magnetic cover 42 is formed around the excitation coil 43. Further, when the fixed magnetic pole member 45 and the magnetic cover 42 are joined, the iron core chamber 32 is defined between the body 22 and the second flange portion 47 b side of the fixed magnetic pole member 45. Further, the seal member 14 is interposed between the insulating coating 48 on the second flange portion 47 b side and the body 22.

  The solenoid valve 11 is assembled in the following order. First, in the body 22 in which the magnetic cover 42 is integrated, the movable iron core 33 is mounted on the guide shaft 31 and the iron core return spring 34 is interposed between the movable iron core 33 and the body 22. Next, in the fixed magnetic pole member 45 in which the exciting coil 43 is wound around the fixed iron core 44, the first flange portion 47 a of the fixed iron core 44 is moved while the insulating coating 48 on the second flange portion 47 b side is pressed against the body 22. The inner surface of the magnetic cover 42 is joined (fixed) by laser welding. At this time, the seal member 14 is interposed between the end face of the insulating coating 48 on the second flange portion 47 b side and the body 22. The tip of the guide shaft 31 is press-fitted into the recess 44 a of the fixed iron core 44. Next, when the valve body 27 and the valve return spring 30 are accommodated in the valve chamber 23 inside the body 22, and the retainer 29 is finally assembled to the body 22, the electromagnetic valve 11 is assembled.

  In the solenoid valve 11 having the above-described configuration, when the exciting coil 43 is not energized, the movable iron core 33 is disposed at a position separated from the fixed iron core 44 by the spring force of the iron core return spring 34. At this time, 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 The discharge port R communicates with each other via the valve chamber 23. When the exciting coil 43 is energized from this state, 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 is attracted to the fixed iron core 44 against the spring force of the iron core return spring 34. The Then, the valve element 27 is separated from the supply valve seat 28a by the spring force of the valve return spring 30 and is 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. 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.

  According to the above embodiment, the following effects can be obtained.

  (1) In the solenoid part 41, the insulating property between the fixed iron core 44 and the exciting coil 43 is ensured by the insulating film part 48 formed directly on the fixed iron core 44. For this reason, as compared with the configuration in which the bobbin around which the excitation coil is wound is mounted on the fixed iron core as in the background art, a portion (insulating film portion) for ensuring insulation between the fixed iron core 44 and the excitation coil 43 is used. 48) can be reduced in thickness. The bobbin in the background art requires a required strength. Further, in order to attach the bobbin to the fixed iron core, the bobbin must be manufactured larger than the fixed iron core, and the thickness of the bobbin is larger than the thickness of the insulating coating 48. Become thicker. For this reason, when the size of the fixed iron core 44 (particularly the shaft diameter) and the size of the solenoid portion 41 are the same, the magnet wire in the exciting coil 43 is compared with the case where a bobbin is provided in the fixed iron core 44 to ensure insulation. The number of turns can be increased. Therefore, the magnetomotive force of the exciting coil 43 can be increased as compared with the case where the bobbin is used without increasing the size of the solenoid unit 41.

  As a result, the attractive force of the fixed iron core 44 can be increased as the magnetomotive force of the exciting coil 43 increases, so that the spring force of the iron core return spring 34 can be increased, and the spring force of the iron core return spring 34 can be increased. The valve body 27 to be pressed can be strongly pressed against the valve seat 92. Therefore, the supply passage 24 can be closed by the valve body 27 and the supply port P can be reliably closed (sealed). Further, since the spring force of the iron core return spring 34 can be increased, the valve body 27 can be pressed against the supply valve seat 28a even if the spring force of the valve return spring 30 that biases the valve body 27 is increased. become. Therefore, the valve element 27 can be quickly moved in the direction away from the supply valve seat 28 a by the spring force of the valve return spring 30. Therefore, the performance of the electromagnetic valve 11 can be improved by increasing the attractive force of the fixed iron core 44.

  (2) In the solenoid part 41, the insulating property of the fixed iron core 44 and the exciting coil 43 is ensured by the insulating film part 48 formed directly on the fixed iron core 44. Therefore, unlike the configuration in which the bobbin around which the exciting coil is wound is mounted on the fixed iron core as in the background art, the bobbin that is a separate member from the fixed iron core 44 can be eliminated, and the number of parts of the solenoid unit 41 is reduced. As a result, the number of parts of the electromagnetic valve 11 can be reduced.

  (3) In the solenoid portion 41, the insulating coating portion 48 is directly formed on the fixed iron core 44, thereby ensuring insulation as compared with the configuration in which the bobbin around which the exciting coil is wound is mounted on the fixed iron core. The thickness of the part can be reduced. Therefore, the number of turns of the magnet wire in the exciting coil 43 can be increased and the magnetomotive force of the exciting coil 43 can be increased as compared with the configuration using the bobbin. Therefore, in the case where the bobbin is used, if the same magnetomotive force as that of the solenoid part 41 of the present embodiment is to be exhibited, the number of turns of the magnet wire increases and the solenoid valve 11 becomes large. Therefore, in the electromagnetic valve 11 of this embodiment, the magnetomotive force of the solenoid part 41 can be increased without increasing the size.

  (4) The thickness of the insulating coating 48 is preferably set to 0.1 to 0.5 mm, and in this embodiment is set to 0.1 to 0.2 mm. By setting the thickness of the insulating coating portion 48, the insulating coating portion 48 ensures insulation while preventing the insulating coating portion 48 from becoming too thick.

  (5) The insulating coating 48 is formed by coating the peripheral surface of the fixed iron core 44 with a silane (base treatment) and then molding an epoxy resin. For this reason, the bondability between the epoxy resin and the fixed iron core 44 can be improved, and the insulating coating 48 can be made stable to ensure the insulation. Further, by performing the silane treatment, the positive pressure air supplied to the valve chamber 23 is prevented from leaking between the fixed iron core 44 and the insulating coating portion 48. Therefore, when a bobbin is used, a seal member is required between the fixed iron core and the bobbin to prevent leakage of positive pressure air. However, the electromagnetic valve 11 of the present embodiment is sealed by the insulating coating 48. Therefore, a sealing member between the fixed iron core 44 is not required and the number of parts of the electromagnetic valve 11 can be reduced.

  (6) The magnetic cover 42 is integrated when the body 22 is molded, and the first flange portion 47 a of the fixed magnetic pole member 45 is joined to the inner surface of the magnetic cover 42. For this reason, for example, when the electromagnetic valve 11 is assembled, the assembling work of the electromagnetic valve 11 can be facilitated as compared with the case where the magnetic cover 42, the body 22, and the fixed magnetic pole member 45 are respectively screwed. it can.

  (7) The magnetic cover 42 and the body 22 are integrated, and the body 22 is provided with a movable iron core 33. The fixed magnetic pole member 45 is fixed to the magnetic cover 42 so that the fixed magnetic pole member 45 is in pressure contact with the body 22. For this reason, the size of the iron core chamber 32 formed between the body 22 and the fixed magnetic pole member 45 is uniquely determined, and the stroke amount (movement amount) of the movable iron core 33 accommodated in the iron core chamber 32 varies. The width can be reduced. In addition, for example, when the electromagnetic valve 11 is assembled, the position of the body 22 relative to the fixed magnetic pole member 45 is changed as compared with the case where the magnetic cover 42, the body 22, and the fixed magnetic pole member 45 are screwed. Can be reduced.

  (8) The fixed iron core 44 is formed in an oval shape in plan view. For this reason, compared with the case where the fixed iron core 44 is formed in a circular shape, the attractive magnetic path with the movable iron core 33 can be widened. Furthermore, the magnetic path area can be increased within a range in which leakage magnetism between the magnetic cover 42 and the second flange portion 47b of the fixed iron core 44 does not increase.

  In addition, you may change the said embodiment as follows.

  The fixed magnetic pole member 45 and the magnetic cover 42 may be fixed by screwing.

  ○ The magnetic cover 42 and the body 22 may not be integrated.

  The film formation of the insulating film portion 48 on the fixed iron core 44 may be performed by applying a primer for adhesion, for example, a rubber vulcanized adhesive as a base treatment, and then forming a film of a thermosetting resin. Similar effects can be obtained.

  In the main valve portion 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.

Sectional drawing which shows the solenoid valve of embodiment. Sectional drawing which shows the solenoid valve of embodiment. The top view which shows the solenoid valve of embodiment. Sectional drawing which shows the solenoid valve of background art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Solenoid valve, 21 ... Main valve part, 22 ... Body, 23 ... Valve chamber, 27 ... Valve body, 28a ... Supply valve seat, 28b ... Discharge valve seat, 33 ... Movable core, 41 ... Solenoid part, 42 ... Magnetic Cover, 43 ... excitation coil, 44 ... fixed iron core, 45 ... fixed magnetic pole member, 46 ... shaft, 47a ... first flange, 47b ... second flange, 48 ... insulating coating, 49 ... coil terminal.

Claims (2)

A valve body is housed in a valve chamber formed in the body, and a main valve portion that enables switching of a flow path by contact and separation of the valve body with respect to a valve seat provided in the valve chamber, and the valve body as a valve A solenoid part that is driven in a direction to contact and separate from the seat,
The solenoid part is formed of a fixed magnetic pole member in which an exciting coil is wound around a fixed iron core, a magnetic cover that surrounds the fixed magnetic pole member and forms an outer part of the solenoid part, and a movable iron core that can be contacted with and separated from the fixed iron core Has been
The fixed iron core includes a shaft portion and flange portions provided at both ends of the shaft portion. The shaft portion and the flange portion are covered with an insulating coating portion, and the fixed iron core is provided with the insulating coating portion through the insulating coating portion. An exciting coil is wound ,
The insulating coating portion is formed by subjecting the fixed iron core to a base treatment, and then an insulating resin material is formed into a coating,
The flange portion includes a first flange portion provided at an end opposite to the main valve portion, and a second flange portion provided at an end portion on the main valve portion side. The flange portion is provided so that a protruding length from the shaft portion is larger than the second flange portion,
In the first flange portion, a surface that is continuous with the peripheral surface of the shaft portion and is orthogonal to the axial direction of the shaft portion is covered with the insulating coating portion, and the insulating coating portion is covered with the first flange portion. To a position that is flush with the circumferential surface of the first flange portion so that the circumferential surface of the first flange portion is joined to the inner surface of the magnetic cover,
In the second flange portion, a surface that is continuous with the peripheral surface of the shaft portion, is orthogonal to the axial direction of the shaft portion, and extends in the axial direction of the shaft portion is covered with the insulating coating film. And the insulating coating film covering the peripheral surface of the second flange portion is joined to the inner surface of the magnetic cover . The solenoid valve according to claim 1, wherein a thickness of the insulating coating portion in the shaft portion is 0.1 to 0.5 mm .

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