JP6925841B2 - solenoid valve - Google Patents

Description

The present invention relates to a solenoid valve.

For example, as shown in FIG. 7, the solenoid valve of Patent Document 1 includes a valve body 101 for switching a flow path formed in the body 100, and a solenoid unit 102 for moving the valve body 101. The solenoid unit 102 separates the coil 103, the columnar fixed core 104, the movable core 105 that is attracted to the fixed core 104 by supplying electric power to the coil 103, and the movable core 105 from the fixed core 104. It has an urging spring 106 for urging. The coil 103 is wound around a tubular resin bobbin 107 provided on the outer peripheral surface of the fixed iron core 104. Then, when electric power is supplied to the coil 103, the movable iron core 105 is attracted to the fixed iron core 104 against the urging force of the urging spring 106. The valve body 101 moves and the flow path is switched as the movable iron core 105 is attracted to the fixed iron core 104.

A valve chamber 108 for accommodating the valve body 101 is formed in the body 100. Further, an iron core chamber 109 in which the movable iron core 105 is housed is recessed in the end surface 100a of the body 100. The movable iron core 105 has a valve pressing portion 105a that penetrates the body 100 from the iron core chamber 109, projects into the valve chamber 108, and extends toward the valve body 101. Therefore, the valve chamber 108 and the iron core chamber 109 communicate with each other. Then, in a state where the movable iron core 105 is separated from the fixed iron core 104 by the urging force of the urging spring 106, the valve pressing portion 105a presses the valve body 101.

The fixed iron core 104 has a flat magnetic pole surface 104a facing the movable iron core 105. Further, the bobbin 107 has a flat facing surface 107a facing the end surface 100a of the body 100. The magnetic pole surface 104a of the fixed iron core 104 and the facing surface 107a of the bobbin 107 are located on the same surface.

A sheet-shaped resin cushioning material 110 is interposed between the magnetic pole surface 104a of the fixed iron core 104 and the facing surface 107a of the bobbin 107 and the end surface 100a of the movable iron core 105 and the body 100. The outer peripheral portion of the cushioning material 110 is sandwiched between the facing surface 107a of the bobbin 107 and the end surface 100a of the body 100. Further, a rubber gasket 111 is interposed between the end surface 100a of the body 100 and the cushioning material 110. The gasket 111 seals between the end face 100a of the body 100 and the cushioning material 110.

The cushioning material 110 reduces the wear of the fixed core 104 and the movable core 105 by alleviating the impact of the movable core 105 on the fixed core 104 when the movable core 105 is attracted to the fixed core 104. Further, the cushioning material 110 suppresses the fluid flowing from the valve chamber 108 into the iron core chamber 109 from leaking to the outside through between the outer peripheral surface of the fixed iron core 104 and the inner peripheral surface of the bobbin 107.

Japanese Unexamined Patent Publication No. 2009-275811

By the way, as shown in FIG. 8, for example, when the iron core chamber 109 is in a negative pressure state, the pressure between the magnetic pole surface 104a of the fixed iron core 104 and the facing surface 107a of the bobbin 107 and the cushioning material 110 is atmospheric pressure. Therefore, the cushioning material 110 may be curved and deformed so as to be convex toward the iron core chamber 109. When the cushioning material 110 is curved and deformed so as to be convex toward the iron core chamber 109, when the movable iron core 105 is attracted to the fixed core 104, the movement of the movable iron core 105 toward the fixed core 104 is caused by the cushioning material 110. It may be hindered and the solenoid valve may malfunction.

The present invention has been made to solve the above problems, and an object of the present invention is to bend and deform the cushioning material so as to be convex toward the core chamber even when the iron core chamber is in a negative pressure state. The purpose is to provide a solenoid valve that can suppress this.

The solenoid valve that solves the above problems includes a valve body for switching the flow path formed in the body and a solenoid portion for moving the valve body, and the solenoid portion includes a coil and a columnar fixed iron core. , The movable core that is attracted to the fixed core by supplying power to the coil is interposed between the movable core and the fixed core, and the movable core is attached in a direction that separates the movable core from the fixed core. It has an urging spring for urging and a resin bobbin provided on the outer peripheral surface of the fixed iron core and wound with the coil, and the movable iron core is a core chamber recessed in the end surface of the body. The fixed iron core has a flat surface-like magnetic pole surface facing the movable iron core, and the bobbin has a flat surface-like facing surface facing the end surface. A sheet-shaped cushioning material is interposed between the magnetic pole surface and the facing surface and the movable iron core and the end surface, and the outer peripheral portion of the cushioning material is sandwiched between the facing surface and the end surface. It is a solenoid valve, and a through hole is formed in the cushioning material, and the cushioning material is adhered to the magnetic pole surface and the facing surface by a thermosetting adhesive.

In the solenoid valve, the movable iron core is formed with a spring accommodating hole for accommodating the urging spring, and in the moving direction of the movable iron core, the entire inner peripheral edge of the through hole is the spring accommodating hole. It should overlap with the inside.

According to the present invention, even if the iron core chamber is in a negative pressure state, it is possible to prevent the cushioning material from being curved and deformed so as to be convex toward the iron core chamber.

FIG. 5 is a cross-sectional view showing a solenoid valve in the embodiment. FIG. 2-2 is a cross-sectional view taken along the line 2-2 in FIG. Sectional view of solenoid valve. FIG. 3 is a sectional view taken along line 4-4 in FIG. Partially enlarged cross-sectional view of the solenoid valve. An exploded perspective view showing a fixed iron core, a bobbin, and a cushioning material. Partially enlarged cross-sectional view of the solenoid valve in the conventional example. A cross-sectional view showing a state in which the cushioning material is curved and deformed so as to be convex toward the iron core chamber.

Hereinafter, an embodiment in which the solenoid valve is embodied will be described with reference to FIGS. 1 to 6.
As shown in FIGS. 1 to 4, the solenoid valve 10 includes a body 11 made of a synthetic resin material made of a non-magnetic material. Further, the solenoid valve 10 includes a valve body 20 for switching the flow path formed in the body 11 and a solenoid portion 30 for moving the valve body 20.

A supply port 11a, an output port 11b, and a discharge port 11c are formed on one side surface of the body 11 on the bottom side. A positive pressure supply source (not shown) is connected to the supply port 11a via a pipe (not shown). A pneumatic device (not shown) is connected to the output port 11b via a pipe (not shown). A negative pressure source (not shown) is connected to the discharge port 11c via a pipe (not shown).

A plug 12 is attached to one end of the body 11 in the longitudinal direction via a seal portion 12s made of a gasket or an O-ring. The plug 12 cooperates with the body 11 to partition the valve chamber 13 that houses the valve body 20.

A supply passage 14a communicating with the supply port 11a is formed in the body 11 and the plug 12. Further, the body 11 is formed with an output passage 14b communicating with the output port 11b and a discharge passage 14c communicating with the discharge port 11c. The supply port 11a communicates with the valve chamber 13 via the supply passage 14a. The output port 11b communicates with the inside of the valve chamber 13 via the output passage 14b. The discharge port 11c communicates with the inside of the valve chamber 13 via the discharge passage 14c.

In the plug 12, a valve seat 12e on the supply side on which the valve body 20 is seated is formed around the end face facing the inside of the valve chamber 13 and around the opening of the supply passage 14a to the valve chamber 13. Further, in the body 11, a valve seat 11e on the discharge side on which the valve body 20 is seated is formed around the end face facing the inside of the valve chamber 13 and around the opening of the discharge passage 14c to the valve chamber 13. The valve body 20 can be brought into contact with and detached from both valve seats 11e and 12e. In the valve chamber 13, a valve body spring 15 is interposed between the valve body 20 and the plug 12.

In the valve chamber 13, a bottomed tubular valve guide 21 arranged around the valve body 20 and guiding the valve body 20 is housed. The valve guide 21 has a tubular portion 21a arranged around the valve body 20 and a bottom portion 21b that is continuous with the valve seat 11e side of the tubular portion 21a and extends in a direction orthogonal to the moving direction of the valve body 20. .. The bottom portion 21b is formed with an escape hole 21h for avoiding contact with the valve seat 11e. The valve body 20 is in contact with the periphery of the escape hole 21h in the bottom portion 21b.

A guide portion 21f inserted into the guide groove 11h formed in the body 11 is projected from the bottom portion 21b of the valve guide 21. Since the guide portion 21f is guided by the guide groove 11h, the valve guide 21 can move integrally with the valve body 20 in a state where the inclination of the valve body 20 with respect to the moving direction is restricted. The valve body 20 is urged together with the valve guide 21 in a direction away from the valve seat 12e by the urging force of the valve body spring 15. Therefore, the valve body 20 moves together with the valve guide 21 in a state in which tilting is restricted by the valve guide 21.

An iron core chamber 16 is recessed in an end surface 11d of the body 11 opposite to the plug 12 in the longitudinal direction. The body 11 has a partition wall 11f that separates the valve chamber 13 and the iron core chamber 16.

In the body 11, a tubular magnetic frame 17 extends from the periphery of the iron core chamber 16. The plug 12 side of the magnetic frame 17 is embedded in the body 11, and the side opposite to the plug 12 protrudes from the body 11.

The solenoid unit 30 separates the coil 31, the columnar fixed iron core 32, the movable iron core 33 that is attracted to the fixed iron core 32 by supplying electric power to the coil 31, and the movable iron core 33 from the fixed iron core 32. It has an urging spring 34 for urging and a resin bobbin 35 around which a coil 31 is wound.

The coil 31 is arranged inside the magnetic frame 17. The bobbin 35 has a tubular shape and is provided on the outer peripheral surface of the fixed iron core 32. The movable iron core 33 is housed in the iron core chamber 16. The movable iron core 33 is urged toward the valve chamber 13 by the urging force of the urging spring 34.

The movable iron core 33 has an iron core portion 33a and a resin mounting portion 33b that is attached to the iron core portion 33a. The iron core portion 33a has a tubular shape in which a spring accommodating hole 33h for accommodating the urging spring 34 is formed. Therefore, the movable iron core 33 is formed with a spring accommodating hole 33h for accommodating the urging spring 34. The mounting portion 33b is mounted in the spring accommodating hole 33h of the iron core portion 33a. The urging spring 34 is interposed between the mounting portion 33b and the fixed iron core 32 in the spring accommodating hole 33h. The mounting portion 33b has a pair of long plate-shaped valve pressing portions 33c extending toward the valve guide 21. The pair of valve pressing portions 33c project from the end faces of the mounting portion 33b on the side opposite to the urging spring 34.

As shown in FIGS. 2 and 4, the partition wall 11f is formed with an insertion hole 11k through which a pair of valve pressing portions 33c are inserted. Then, when the pair of valve pressing portions 33c are inserted into the respective insertion holes 11k, the pair of valve pressing portions 33c penetrates the partition wall 11f from the iron core chamber 16 and protrudes into the valve chamber 13 to the valve body 20. It extends toward. The valve chamber 13 and the iron core chamber 16 communicate with each other through the insertion holes 11k. The valve guide 21 is in contact with the pair of valve pressing portions 33c in the moving direction of the valve body 20. Then, in a state where the movable iron core 33 is urged toward the valve chamber 13 by the urging spring 34, the valve guide 21 is pressed by the valve pressing portion 33c, and the valve body 20 is pressed against the valve seat 12e.

As shown in FIGS. 3 and 4, when electric power is supplied to the coil 31, the coil 31 is excited, and a magnetic flux passing through the magnetic frame 17, the fixed iron core 32, and the movable iron core 33 is generated around the coil 31. .. Then, an attractive force is generated in the fixed iron core 32 by the exciting action of the coil 31, the movable iron core 33 is attracted to the fixed iron core 32 against the urging force of the urging spring 34, and the valve body 20 is attached to the valve body spring 15. It moves in a direction away from the valve seat 12e by the force and is seated on the valve seat 11e. As a result, the supply passage 14a is opened and the discharge passage 14c is closed, and the supply port 11a and the output port 11b communicate with each other through the supply passage 14a, the valve chamber 13 and the output passage 14b, and the output passage 14b and the valve chamber are communicated with each other. Communication between the output port 11b and the discharge port 11c via the 13 and the discharge passage 14c is cut off.

As shown in FIGS. 1 and 2, when the supply of electric power to the coil 31 is stopped, the attractive force of the fixed iron core 32 due to the exciting action of the coil 31 disappears, and the movable iron core 33 causes the urging force of the urging spring 34. Moves in a direction away from the fixed iron core 32. Then, the valve guide 21 and the valve body 20 are pressed toward the valve seat 12e against the urging force of the valve body spring 15 by the valve pressing portion 33c of the movable iron core 33, and are seated on the valve seat 12e. As a result, the supply passage 14a is closed and the discharge passage 14c is opened, and the output port 11b and the discharge port 11c communicate with each other through the output passage 14b, the valve chamber 13 and the discharge passage 14c, and the supply passage 14a and the valve chamber are communicated with each other. Communication between the supply port 11a and the output port 11b via the 13 and the output passage 14b is cut off.

The fixed iron core 32 is formed of a soft magnetic material made of metal. The fixed iron core 32 includes a columnar shaft portion 32a and a first flange portion 32b and a second flange portion 32c provided at both ends of the shaft portion 32a in the axial direction. The first flange portion 32b and the second flange portion 32c extend in a direction orthogonal to the axial direction of the shaft portion 32a. The first flange portion 32b and the second flange portion 32c are formed in an oval shape in a plan view. The shaft portion 32a is orthogonal to the axial direction of the shaft portion 32a, and the cross-sectional view of the first flange portion 32b and the second flange portion 32c in the direction along the oval plane is formed in an oval shape. There is. The first flange portion 32b is formed to have a shorter major axis and a shorter diameter than the second flange portion 32c. The first flange portion 32b has a surface 321b facing the second flange portion 32c in the axial direction of the shaft portion 32a. The second flange portion 32c has a surface 321c facing the surface 321b of the first flange portion 32b in the axial direction of the shaft portion 32a. Further, the outer end surfaces of the first flange portion 32b and the second flange portion 32c located in the axial direction of the shaft portion 32a are formed in a flat surface shape.

The fixed iron core 32 is arranged with respect to the body 11 so that the outer end surface of the first flange portion 32b faces the movable iron core 33. The end surface of the first flange portion 32b is a flat magnetic pole surface 32e facing the movable iron core 33. Therefore, the fixed iron core 32 has a flat magnetic pole surface 32e facing the movable iron core 33.

The bobbin 35 includes a tubular portion 35a that covers the outer peripheral surface of the shaft portion 32a, an annular first extending portion 35b that is continuous with the tubular portion 35a and extends along the surface 321b of the first flange portion 32b, and a tubular portion 35a. It has an annular second extending portion 35c that is continuous with the second flange portion 32c and extends along the surface 321c of the second flange portion 32c. The first extension portion 35b covers the surface 321b of the first flange portion 32b. The second extending portion 35c covers the surface 321c of the second flange portion 32c. The coil 31 is wound between the tubular portion 35a, the first extension portion 35b, and the second extension portion 35c.

Further, the bobbin 35 is continuous with the outer peripheral portion of the first extension portion 35b and is continuous with the first annular portion 35d that covers the outer peripheral surface of the first flange portion 32b and the outer peripheral portion of the second extension portion 35c. It has a second annular portion 35e that covers the outer peripheral surface of the second flange portion 32c. Therefore, the outer peripheral surface of the fixed iron core 32 is covered with the bobbin 35. The radial thickness of the first annular portion 35d is thicker than the radial thickness of the second annular portion 35e. The bobbin 35 is integrally molded with the fixed iron core 32 by filling the mold with molten resin and solidifying the bobbin 35 with the fixed iron core 32 set in the mold.

As shown in FIG. 5, the outer end surface of the first annular portion 35d of the bobbin 35 located in the axial direction of the tubular portion 35a is a flat facing surface 35f facing the end surface 11d of the body 11. Therefore, the bobbin 35 has a flat facing surface 35f facing the end surface 11d of the body 11. The magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 are located on the same surface.

A sheet-shaped cushioning material 40 is interposed between the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 and the end surface 11d of the movable iron core 33 and the body 11. The cushioning material 40 is formed of, for example, a synthetic resin material such as a liquid crystal polymer (LCP). The cushioning material 40 has a constant thickness. The outer peripheral portion 40a of the cushioning material 40 is sandwiched between the facing surface 35f of the bobbin 35 and the end surface 11d of the body 11.

As shown in FIG. 6, the cushioning material 40 has a shape in which the outer peripheral edge 40b of the cushioning material 40 extends along the outer peripheral edge 351d of the first annular portion 35d of the bobbin 35. The cushioning material 40 is formed with a circular through hole 41. The through hole 41 is formed in the center of the cushioning material 40. In the present embodiment, the cushioning material 40 is formed with only one through hole 41. The entire circumference of the inner peripheral edge 41a of the through hole 41 overlaps the magnetic pole surface 32e of the fixed iron core 32. The cushioning material 40 overlaps the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 so as to straddle the boundary between the outer peripheral surface of the first flange portion 32b and the inner peripheral surface of the first annular portion 35d.

As shown in FIG. 5, in the moving direction X1 of the movable iron core 33, the entire circumference of the inner peripheral edge 41a of the through hole 41 overlaps with the inside of the spring accommodating hole 33h. The through hole 41 is a hole smaller than the spring accommodating hole 33h. The end of the urging spring 34 on the fixed iron core 32 side passes through the through hole 41 and is in contact with the magnetic pole surface 32e of the fixed iron core 32.

An annular mounting groove 11g is formed on the end surface 11d of the body 11. An annular seal member 43 is mounted in the mounting groove 11g. The sealing member 43 is, for example, a gasket made of rubber. The sealing member 43 is in close contact with the surface of the cushioning material 40 on the body 11 side and the inner surface of the mounting groove 11g, and seals between the cushioning material 40 and the end surface 11d of the body 11. Therefore, it is suppressed that the fluid flowing from the valve chamber 13 into the iron core chamber 16 through each insertion hole 11k leaks to the outside of the solenoid valve 10 through between the cushioning material 40 and the end surface 11d of the body 11. ..

The cushioning material 40 is adhered to the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 by a thermosetting adhesive material 42. The adhesive material 42 is, for example, a sheet-shaped adhesive film. The adhesive material 42 has a hole 42a that overlaps with the through hole 41 of the cushioning material 40. The cushioning material 40 has an adhesive 42 interposed between the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35, and the cushioning material 40 and the adhesive 42 are placed on the magnetic pole surface 32e of the fixed iron core 32 and the bobbin 35. By heat welding while being pressed against the facing surface 35f, it is adhered to the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 via the adhesive material 42.

When the cushioning material 40, the magnetic pole surface 32e of the fixed iron core 32, and the facing surface 35f of the bobbin 35 are adhered by the adhesive material 42, the air existing between the adhesive material 42 and the cushioning material 40 penetrates the cushioning material 40. It is discharged to the outside through the hole 41. As a result, after the cushioning material 40, the magnetic pole surface 32e of the fixed iron core 32, and the facing surface 35f of the bobbin 35 are adhered by the adhesive material 42, air is prevented from accumulating between the adhesive material 42 and the cushioning material 40. Will be done.

Further, when the cushioning material 40, the magnetic pole surface 32e of the fixed iron core 32, and the facing surface 35f of the bobbin 35 are bonded by the adhesive material 42, the magnetic pole surface 32e of the fixed iron core 32, the facing surface 35f of the bobbin 35, and the adhesive material 42 The air existing between the two is discharged to the outside through the hole 42a of the adhesive material 42 and the through hole 41 of the cushioning material 40. As a result, after the cushioning material 40, the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 are adhered by the adhesive material 42, the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 and the adhesive material 42 are attached. The accumulation of air between the two is suppressed.

The cushioning material 40 reduces the wear of the fixed core 32 and the movable core 33 by alleviating the impact of the movable core 33 on the fixed core 32 when the movable core 33 is adsorbed on the fixed core 32. Further, the cushioning material 40 overlaps the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 so as to straddle the boundary between the outer peripheral surface of the first flange portion 32b and the inner peripheral surface of the first annular portion 35d. In this state, it is adhered to the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 via the adhesive material 42. Therefore, the fluid flowing from the valve chamber 13 into the iron core chamber 16 through each insertion hole 11k may leak to the outside of the solenoid valve 10 via between the outer peripheral surface of the fixed iron core 32 and the inner peripheral surface of the bobbin 35. It is suppressed.

Next, the operation of this embodiment will be described.
When the discharge port 11c is connected to the negative pressure source, the valve chamber 13 and the iron core chamber 16 communicate with each other through the insertion holes 11k, so that the iron core chamber 16 may be in a negative pressure state. .. For example, when the cushioning material 40 is not adhered to the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 by the adhesive material 42, the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 and the cushioning material 40 Air flows from the outside of the solenoid valve 10 between the outer peripheral surface of the fixed iron core 32 and the inner peripheral surface of the bobbin 35. When the iron core chamber 16 is in a negative pressure state, the pressure between the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 and the cushioning material 40 is atmospheric pressure. It tries to be curved and deformed so as to be convex toward 16.

Therefore, in the present embodiment, since the cushioning material 40 is adhered to the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 by the adhesive material 42, the cushioning material 40 is adhered even when the iron core chamber 16 is in a negative pressure state. The adhesive force of the material 42 prevents the cushioning material 40 from being curved and deformed so as to be convex toward the iron core chamber 16.

Further, since the through hole 41 is formed in the cushioning material 40, the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 and the cushioning material are compared with the case where the through hole 41 is not formed in the cushioning material 40. The pressure receiving area of the cushioning material 40 that receives the pressure between 40 and 40 is reduced. Therefore, even if the iron core chamber 16 is in a negative pressure state, it is suppressed that the cushioning material 40 is curved and deformed so as to be convex toward the iron core chamber 16.

In the above embodiment, the following effects can be obtained.
(1) The cushioning material 40 is adhered to the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 by a thermosetting adhesive material 42. According to this, even if the iron core chamber 16 is in a negative pressure state, it is possible to prevent the cushioning material 40 from being curved and deformed so as to be convex toward the iron core chamber 16 due to the adhesive force of the adhesive material 42. can. Further, since the through hole 41 is formed in the cushioning material 40, the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 and the cushioning material are compared with the case where the through hole 41 is not formed in the cushioning material 40. The pressure receiving area of the cushioning material 40 that receives the pressure between 40 and 40 is reduced. Therefore, even if the iron core chamber 16 is in a negative pressure state, it is possible to prevent the cushioning material 40 from being curved and deformed so as to be convex toward the iron core chamber 16.

(2) In the moving direction X1 of the movable iron core 33, the entire circumference of the inner peripheral edge 41a of the through hole 41 overlaps with the inside of the spring accommodating hole 33h. According to this, in the moving direction X1 of the movable iron core 33, the movable iron core 33 is attracted to the fixed iron core 32 as compared with the case where the entire circumference of the inner peripheral edge 41a of the through hole 41 overlaps with the outside of the spring accommodating hole 33h. It is possible to secure a wide contact area between the movable iron core 33 and the cushioning material 40 at the time. Therefore, the impact of the movable iron core 33 on the fixed iron core 32 when the movable iron core 33 is attracted to the fixed iron core 32 can be easily mitigated by the cushioning material 40, and the durability of the solenoid valve 10 can be improved.

(3) When the cushioning material 40, the magnetic pole surface 32e of the fixed iron core 32, and the facing surface 35f of the bobbin 35 are adhered by the adhesive material 42, the air existing between the adhesive material 42 and the cushioning material 40 is the cushioning material. It is discharged to the outside through the through hole 41 of 40. Further, the air existing between the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 and the adhesive material 42 is discharged to the outside through the holes 42a of the adhesive material 42 and the through holes 41 of the cushioning material 40. NS. As a result, the adhesion between the cushioning material 40 via the adhesive 42 and the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 can be improved.

(4) The cushioning material 40 is adhered to the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 by a thermosetting adhesive material 42. According to this, for example, the adhesive material is fixed to the cushioning material 40 as in the case where the cushioning material 40 is adhered to the magnetic pole surface 32e of the fixed iron core 32 and the facing surface 35f of the bobbin 35 by a liquid adhesive material. It does not flow out from between the magnetic pole surface 32e of the iron core 32 and the facing surface 35f of the bobbin 35. Therefore, it is possible to secure the adhesive strength between the cushioning material 40 via the adhesive material 42, the magnetic pole surface 32e of the fixed iron core 32, and the facing surface 35f of the bobbin 35.

(5) According to the present embodiment, even if the iron core chamber 16 is in a negative pressure state, the cushioning material 40 is prevented from being curved and deformed so as to be convex toward the iron core chamber 16, so that the movable iron core is prevented. It is possible to prevent the solenoid valve 10 from malfunctioning due to the cushioning material 40 hindering the movement of the 33 toward the fixed iron core 32.

The above embodiment may be changed as follows.
In the embodiment, the through hole 41 is a hole larger than the spring accommodating hole 33h, and the entire circumference of the inner peripheral edge 41a of the through hole 41 overlaps the outside of the spring accommodating hole 33h in the moving direction X1 of the movable iron core 33. You may.

-In the embodiment, the cushioning material 40 may be formed of, for example, polyethylene terephthalate (PET), polyimide (PI), or the like.
-In the embodiment, the through hole 41 may have a square hole shape, for example, and the shape thereof is not particularly limited.

-In the embodiment, a plurality of through holes 41 may be formed in the cushioning material 40. For example, the cushioning material 40 may have a mesh structure.
-In the embodiment, the adhesive material 42 does not have to have a hole 42a that overlaps with the through hole 41 of the cushioning material 40.

10 ... Solenoid valve, 11 ... Body, 11d ... End face, 16 ... Iron core chamber, 20 ... Valve body, 30 ... Solenoid part, 31 ... Coil, 32 ... Fixed iron core, 32e ... Magnetic pole surface, 33 ... Movable iron core, 33h ... Spring Accommodating hole, 34 ... urging spring, 35 ... bobbin, 35f ... facing surface, 40 ... cushioning material, 40a ... outer peripheral portion, 41 ... through hole, 41a ... inner peripheral edge, 42 ... adhesive material.

Claims (2)

A valve body for switching the flow path formed in the body and a solenoid portion for moving the valve body are provided.
The solenoid portion is interposed between the coil, the columnar fixed iron core, the movable iron core that is attracted to the fixed iron core by supplying electric power to the coil, and the movable iron core and the fixed iron core. It has an urging spring that urges the movable iron core in a direction away from the fixed iron core, and a resin bobbin provided on the outer peripheral surface of the fixed iron core and wound with the coil.
The movable iron core is housed in an iron core chamber recessed in the end surface of the body, the fixed iron core has a flat surface-like magnetic pole surface facing the movable iron core, and the bobbin is the bobbin. It has a flat facing surface facing the end surface, and has a flat facing surface.
A sheet-shaped cushioning material is interposed between the magnetic pole surface and the facing surface and the movable iron core and the end surface, and the outer peripheral portion of the cushioning material is sandwiched between the facing surface and the end surface. It ’s a solenoid valve,
A solenoid valve characterized in that a through hole is formed in the cushioning material, and the cushioning material is adhered to the magnetic pole surface and the facing surface by a thermosetting adhesive. The movable iron core is formed with a spring accommodating hole for accommodating the urging spring.
In the moving direction of the movable iron core, the entire circumference of the inner peripheral edge of the through hole overlaps with the inside of the spring accommodating hole .
The solenoid valve according to claim 1 , wherein the end portion of the urging spring on the fixed iron core side passes through the through hole and is in contact with the magnetic pole surface.

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