JP3122569B2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic valve in which an assembly provided with a solenoid valve, particularly a passage opened and closed by the valve, is mounted on a case in which electromagnetic components such as a coil, a fixed iron core and a movable iron core are accommodated. About the valve.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional solenoid valve. In this figure, reference numeral 1 denotes a bobbin, which has a hollow portion formed inside and a coil 2 wound around the outer periphery. Reference numeral 3 denotes a substantially trapezoidal fixed iron core, the convex portion of which is inserted into the hollow portion of the bobbin 1. Reference numeral 4 denotes a movable iron core having a concave portion, which is inserted into a hollow portion of the bobbin, one end of which is opposed to the fixed iron core 3, and the other is arranged so as to be able to contact the ball 6. Reference numeral 5 denotes a resin assembly having an input port 5a, an output port 5b, and a drain port 5 therein.
c is provided, and valve seats 5d and 5e are formed.
Each of these ports or valve seats is a passage for the assembly 5. The ball 6 has a function as a valve body, and moves in accordance with the movement of the movable iron core 4 and changes the communication mode of each port by coming into contact with or separating from the valve seats 5d and 5e. Reference numeral 7 denotes a metal holder forming a part of a magnetic circuit. 8 is a spring as a biasing member is disposed between the concave and the convex portion of the fixed iron core 3 of the movable iron core 4, with the movable iron core 4 opposite to the fixed iron core 3, i.e. to the assembly 5 side Energize. Reference numeral 9 denotes a case made of metal and formed of a cylindrical member (a part of which may be omitted) or a divided plate-like member. A step 9a is formed inside the case, and the step 9a
In the lower part of the figure, the case 9 is thin and a fixed portion 9b bent inward is formed at the end of this portion. The holder 7 and the assembly 5 are held by the case 9
Mounted on The fixed iron core 3 is mounted in the case 9 by caulking the other end of the case 9. Reference numeral 10 denotes a lead wire for supplying electricity to the coil 2.

Next, the operation of the conventional device will be described. When the coil 2 is not excited, the movable iron core 4 is pressed by the spring 8, and the tip of the movable iron core 4 moves the ball 6 to the valve seat 5d.
State. Thus, fluid from the input port 5a in this state is not the flow is inhibited to the ball 6, the fluid flows from the output port 5b into the drain port 5c. When the coil 2 is excited, the movable iron core 4 is attracted toward the fixed iron core 3 against the urging force of the spring 8 in accordance with the amount of energization. This volume by the movable iron core 4 tip - Le
No pressure is applied to the valve 6 and the ball 6 comes into contact with the valve seat 5e by the fluid from the input port. Therefore, fluid from the input port 5a flows to the output port 5b, and no fluid flows to the drain port 5c. Here, assembly 5
The holder 7 and the holder 7 are attached to the case 9 together with the bobbin 1 and the iron cores 3 and 4 by being caulked to the case 9 as described above.

[0004]

However, the above-mentioned conventional solenoid valve has the following problems. That is, since the resin assembly 5 is attached to the case 9 by being caulked by the fixing portion 9b of the case 9, when the assembly 5 changes dimensions due to ambient heat or moisture,
In particular, due to the high heat, the fixing portion 9b of the assembly 5
If the caulked part shrinks and becomes thinner (this
Elephants and the resulting fragility of the resin
That dead fat), a fixed portion 9b, the assembly 5 a gap is generated between the original crimped by being part of the assembly 5 is thus rattling in the axial direction of the solenoid valve. If the assembly 5 rattles, for example, the distance between the movable core 4 and the fixed core 3 when the coil 2 is not excited becomes longer than before the assembly dies (that is, the swaged portion of the assembly becomes thinner). As a result, the ball 6 is pressed by the spring 8 and presses the valve seat 5d, so that the entire assembly 5 is lowered axially downward from the beginning.
As a result, when the movable iron core 4 is attracted to the fixed iron core 3 side and the valve seat 5d is opened, the necessary and sufficient amount of electricity to the coil 2 is changed, and it becomes difficult to appropriately open and close the passage in the assembly 5. There was a problem.

[0005] In order to prevent backlash in the swaged portion even if the resin dies, it is necessary to apply a preload to the assembly or to mold the assembly 5 with a high-strength resin with little deterioration to increase the bonding strength. However, there is a problem that the manufacturing cost of the entire solenoid valve increases. The present invention has been made in order to solve the above-described problems, and it is possible to reliably join a case and a resin assembly, and to operate a valve mechanism that is the same as the initial operation even if the resin dies or the like occurs. It is an object of the present invention to provide a solenoid valve capable of obtaining the following.

[0006]

According to the present invention, basically, a case, a bobbin disposed in the case, a coil wound around the bobbin, and a fixed iron core mounted on the bobbin are provided. a movable iron core is attracted to the fixed iron core side by the excitation of the disposed opposite to the fixed iron core the carp <br/> Le, a biasing member that presses the opposite side of the movable iron core against the fixed iron core, the movable iron core a valve body which moves in relation to the movement, and a the valve passage which is opened and closed is made provided the resin by assembly, in the electromagnetic valve which the assembly is attached to the casing, the plate in this assembly Part and the plate
And a leg formed by bending from a metal part
At least the legs of the holder are formed by insert molding
The above object is attained by a solenoid valve having the assembly fixed to the case by being fixed and a part of the holder being exposed from the assembly to form an exposed portion, and the case being fixed to the exposed portion.

[0007]

According to the first aspect of the present invention, when the coil is not excited, the movable core is pushed toward the non-fixed core by the biasing member.
As a result, the valve element acts to close the passage of the assembly, while when the coil is excited, the movable core is attracted toward the fixed core against the biasing member, and the valve element opens the passage of the assembly. Act on The Holder The assembly of the solenoid valve is integrated by insert molding, by which the case is fixed to the exposed portion of the assembly of the holder, since the assembly is attached to the case, wither the resin constituting the assembly, etc. Deterioration does not affect the location where the holder is fixed to the case, so that the moving distance of the movable iron core does not change compared to the initial stage of using the solenoid valve. Also formed on the holder
Assembling because the legs are inserted into the assembly
Even if force is applied to the holder around the holder.
The legs are used to force the assembly to rotate.
The assembly is prevented from turning. In the invention of claim 2,
Has a substantially right-angled claw formed on the leg.
Therefore, even if force is applied to the assembly in the axial direction of the solenoid valve,
This force is received by the case
And thus the assembly comes off the holder
Is prevented. According to the third aspect of the present invention, the case is particularly structured such that the case is caulked at the exposed portion of the holder, whereby the assembly is attached to the case.

According to the fourth aspect of the present invention, the case is structured such that the case is welded to the exposed portion of the holder, whereby the assembly is attached to the case. According to the fifth aspect of the present invention, when the holder itself is formed as a magnetic circuit, the magnetic circuit portion can be enlarged by forming the hollow portion to be put in the bobbin in the holder.

According to the invention of claim 6 , a hole is provided in the holder,
By inserting the portion including the hole into the assembly, the inner circumference of the hole receives a force that causes the assembly to move around the holder or a force that causes the assembly to escape from the holder. According to the invention of claim 7 , the outer periphery of the exposed portion of the holder is formed in a circular shape having a cutout in a part thereof.
Are formed, if the case is fixed to this part, the inner circumference of the case, even if force is applied to be go around the member containing the assembly, and the arc of holder casing is fixed a circle Since it has a part that does not come into contact, a force that tries to rotate at this part is received, so that the assembly and the like do not rotate inside the case.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. Embodiment 1 will be described with reference to FIGS. Bobbin 1, coil 2, fixed core 3, movable core 4, assembly 5
The configuration of the ports 5a, 5b, 5c, the valve seats 5d, 5e, the ball 6, the spring 8, and the passage opening / closing operation of the solenoid valve are the same as those of the conventional example, and the description thereof will be omitted. The assembly 5 is made of a resin, and a magnetic metal holder 7 is inserted into the assembly 5 (the metal holder 7 is set at a predetermined position in the assembly 5 before the resin is hardened when the assembly 5 is molded. (The method of molding in which the holder 7 is already integrated with the assembly 5 when the assembly 5 is molded)
Have been. Then, an exposed portion 11 is provided by projecting an end of the holder 7 from a side portion of the assembly 5, the exposed portion 11 is sandwiched between a step portion 9 a of the case 9 and a fixing portion 9 b, and the fixing portion 9 b is caulked. The holder 7 is fixed to the case 9 and thus the assembly 5 is fixed to the case 9.

As shown in FIG. 1, the case 9 is not fixed to the projecting portion of the assembly 5. (However, the case may be caulked to this portion. Since the case 9 is fixed to the holder 7, it is not necessary to fix the case 9 up to the separate assembly 5.) In this embodiment, the holder 7 is used. Is a cylindrical hollow portion 1 as shown particularly in FIG.
2, a plate-shaped portion 13 continuously provided below the hollow portion 12 so as to spread around the hollow portion 12, and a leg portion 14 obtained by cutting a part of the plate-shaped portion 14 and bending it downward. The leg 14 is formed at the tip of the leg 14 with a claw 15 which is provided in a substantially right angle direction. As shown in FIG. 1, the hollow portion 12 is inserted into the bobbin 1 so that the metal holder 7 forms a part of the magnetic circuit.
Therefore, the magnetic circuit becomes large.

As shown in FIG. 1, at least a part of the plate-like portion 13 is inserted into a resin assembly 5, whereby the holder 7 is integrated with the assembly 5. The periphery of the plate portion 13 is the exposed portion 11. The legs 14 are also inserted into the assembly 5, in which case even if the assembly 5 tries to rotate around the holder 7, the force is received by the legs 14, and the assembly 5 may actually rotate around the holder 7. Can be prevented. The claw 15 is also inserted into the assembly 5. Even when a vertical force is applied to the assembly 5, the claw 15 receives the force inside the assembly 5 by the claw 15, and the assembly 5 is removed from the holder 7. It is prevented from falling out. The leg portions 14 and the claw portions 15 can prevent the rotation of the resin even if a gap is generated between the inserted portion of the holder 7 and the assembly due to repeated expansion and contraction of the resin constituting the assembly due to heat shrinkage and moisture absorption. Since the function of retaining is exerted, it is particularly effective when the joint 5 between the assembly 5 and the holder 7 is deteriorated due to a change with time of the assembly 5.

However, the legs 14, the claws 15, and the hollow portions 12 are not essential components, but may be any holders 7 having the exposed portions 11 fixed to the case 9. As described above, the holder 7 is inserted so as to be integrated with the assembly 5 and the case 9 is fixed to the exposed portion 11 of the holder 7, so that even if the assembly 5 dies, the moving distance of the movable core 4 is thereby reduced. Does not change, and the initial moving distance can be maintained. Therefore, the movable core 4 performs a predetermined drive in the same energizing manner as when the electromagnetic valve is started to be used, and an appropriate passage opening / closing operation is performed.

Second Embodiment In the first embodiment, the assembly 5 is fixed to the case 9 by caulking the case 9 to the exposed portion 11 of the holder 7. The case 9 and the exposed portion 11 of the holder 7 are welded. May be fixed. In this case, a welding portion may be provided at the portion A in FIG. 1, or projection welding may be employed. The welding increases the fixing strength between the case 9 and the holder 7 as compared with the caulking.

Third Embodiment FIGS. 3A and 3B show a third embodiment. In this embodiment, a hole is formed in the holder 7 and a portion including the hole is inserted into the assembly 5 so as to be integrated. To describe a specific example, as shown in FIG. 3B, the holder 7 is configured to include the hollow portion 12 and the plate portion 13 described in the first embodiment, and an appropriate number of holes are formed in the plate portion 13. 16 are formed.
When this is inserted into the assembly 5 and fixed to the case 9, the result is as shown in FIG. In this embodiment, an exposed portion 11 is formed on the entire circumference of the holder 7, and the case 9 is fixed to a part or the entire circumference of the exposed portion 11 by caulking. In this embodiment, since the portion including the hole 16 of the holder 7 is inserted into the assembly 7, the hole 16 is filled with the resin. Therefore, a force that causes the assembly 5 to rotate around the holder 7 and a force that causes the assembly 5 to move in the axial direction of the solenoid valve are received by the resin portion that is in contact with the holder 7, and the assembly 5 rotates and comes off. Is prevented.

Embodiment 4 Embodiment 4 is shown in FIG. This figure is a plan view of the metal holder 7. In this example, at least part of the periphery of the plate-shaped portion 13 is formed with a portion that does not become a circular arc. Specifically, when the plate-like portion 13 is viewed from above, 18 is a circular arc portion, and a linear portion formed by cutting out an originally arc-shaped portion between the portions 18 is formed. 17. This linear portion 17 is also swaged by the case fixing portion 9b as in the first embodiment. Since the case 5 is swaged along the inner periphery of the case 9 by caulking the case at a portion that does not form the arc of the circle, the force acts in a direction to draw a circle, By being swaged at the linear portion 17, the aforementioned force is received at the portion 17 and the assembly 5 does not rotate.

[0017]

According to the first aspect of the present invention, the assembly is attached to the case by fixing the case to the exposed portion of the metal holder partly exposed by being inserted into the assembly. Even if deterioration such as withering occurs in the resin constituting the above, the fixed state between the case and the holder does not change, so that the distance relationship between the movable core and the passage such as the valve seat of the assembly is deteriorated by the deterioration of the resin. Even if the resin constituting the assembly is degraded, the operating state of the movable core before the resin is degraded can be maintained without change, and the operation of the solenoid valve mechanism can be properly performed without using expensive resin. be able to. Also legs
Part is inserted into the assembly,
Assembly is prevented from rotating around the holder and the assembly
And the holder are stabilized in positional relationship. In the invention of claim 2,
Has a substantially perpendicular claw portion formed on the leg portion.
The pawls allow the assembly to come out of the holder.
Can be prevented. According to the third aspect of the present invention, since the assembly is attached to the case by swaging, the cost of attaching the assembly to the case is reduced. According to the fourth aspect of the present invention, the assembly is attached to the case by welding, so that the assembly and the case are firmly fixed.

According to the fifth aspect of the present invention, since the hollow portion inserted into the bobbin is formed in the holder, the magnetic circuit can be increased by the hollow portion. According to the sixth aspect of the present invention, since the portion including the hole formed in the holder is inserted into the assembly, it is possible to prevent the assembly from rotating around the holder and the detachment of the assembly with a simple configuration. According to the invention of claim 7 , the outer periphery of the holder is
The case is formed in a circular shape having a notch in a part thereof, and the case is fixed to this portion, thereby preventing the assembly from rotating around the inner periphery of the case and stabilizing the position of the assembly in the case.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a solenoid valve according to Embodiments 1 and 2 of the present invention.

FIG. 2 is a perspective view of a metal holder of the solenoid valve according to the first and second embodiments of the present invention.

FIG. 3 shows a solenoid valve according to a third embodiment of the present invention,
(A) is a longitudinal sectional view of the solenoid valve, and (b) is a perspective view of a metal holder.

FIG. 4 is a plan view of a metal holder of an electromagnetic valve according to Embodiment 4 of the present invention.

FIG. 5 is a longitudinal sectional view of a conventional solenoid valve.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 bobbin 2 coil 3 fixed iron core 4 movable iron core 5 assembly 6 ball (valve element) 7 metal holder 8 spring (biasing member) 9 case 9 b fixing part 11 exposed part 12 hollow part 13 plate part 14 leg part 15 claw Part 16 Hole 17 Linear part (part that does not become a circular arc)

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 31/06-31/11

Claims (7)

(57) [Claims] And 1. A case, a bobbin disposed within the casing, a coil wound around the bobbin, the stationary iron core mounted on said bobbin, is disposed opposite to the fixed iron core excitation to the coil a movable iron core is attracted to the fixed iron core side by a biasing member for pressing the opposite side the movable iron core against the fixed iron core, a valve body which moves in relation to the movement of the movable core, by the valve body and a made passage is opened and closed is provided resin assembly, the said assembly is an electromagnetic valve attached to the casing, formed by bending from said acene <br/> Buri to the plate-like portion the plate portion Leg
At least the legs of a metal holder having a
Some of the holder with being fixed by the concert molding to form an exposed portion exposed from the assembly, the assembly by the fact that the case is fixed to the <br/> exposed portion was mounted et the case An electromagnetic valve characterized by the above. 2. The solenoid valve according to claim 1, wherein said leg of said holder is formed with a claw substantially perpendicular to said leg. 3. A solenoid valve according to claim 1 or 2 wherein the assembly is attached to the case by the fact that the case is swaged into the exposed portion of the holder. 4. The solenoid valve according to claim 1, wherein the assembly is attached to the case by welding the case to the exposed portion of the holder. 5. The solenoid valve according to claim 1, wherein said holder has a hollow portion inserted into said bobbin and a portion inserted into said assembly. 6. hole is formed in the holder, solenoid valve according to any one of claims 1 to 5 portion is inserted into the assembly comprising the bore of the holder. 7. periphery of the exposed portion of the holder part
1 to claim formed from a circular shape having a notch
7. The solenoid valve according to any one of 6 .