JP2022126112A - Solenoid device - Google Patents

Abstract

A plunger and a stationary core can be smoothly separated from each other even when a magnetic force remains in the stationary core in a non-excited state, and a sheet member can be prevented from falling off from the stationary core, thereby improving assembly workability of a solenoid device. To provide a solenoid device that can be enhanced. A solenoid device (1) includes a bobbin (2) having a through hole (21) penetrating along the direction of an axis (O), and is inserted into one side of the through hole (21) in the direction of the axis (O) and supported movably along the direction of the axis (O). a plunger 3, a coil 4 wound around an outer peripheral portion 22 of the bobbin 2 and generating a magnetic force when energized to move the plunger 3 along the direction of the axis O; and an urging member 8 disposed between the plunger 3 and the fixed core 5 for urging the plunger 3 to one side in the direction of the axis O, and a through hole S1 through which the rod-like member can pass. and a non-magnetic sheet member S. [Selection drawing] Fig. 1

Description

The present invention relates to solenoid devices.

A solenoid valve that opens and closes a flow path is known (see Patent Document 1, for example). The solenoid valve described in Patent Document 1 includes a stationary core that is excited by a magnetic field generated by energizing a coil, a plunger that is attracted to the excited stationary core, and a force that separates the plunger from the stationary core. A solenoid section (solenoid device) having a return spring is provided.
In this solenoid valve, the plunger is caused to reciprocate as the stationary core is energized and de-energized, and the valve body fixed to the plunger opens and closes the flow path.

JP-A-10-196827

However, conventional solenoid valves are configured such that when the plunger is attracted to an energized stationary core, they come into direct contact. Therefore, even if the fixed core is de-excited, the plunger may not be smoothly separated from the fixed core by the return spring depending on the degree of the residual magnetic force.
SUMMARY OF THE INVENTION It is an object of the present invention to smoothly separate a plunger from a fixed core even when a magnetic force remains in the fixed core in a non-excited state, and to prevent a sheet member from falling off from the fixed core. To provide a solenoid device capable of improving workability.

One aspect of the solenoid device of the present invention includes a cylindrical bobbin having a through hole that passes through along the axial direction, and a bobbin that is inserted into one side of the through hole in the axial direction and supported so as to be movable along the axial direction. a plunger, a coil wound around the outer periphery of the bobbin and generating a magnetic force when energized to move the plunger along the axial direction; and a fixed core inserted in the other axial side of the through hole; A biasing member is disposed between the plunger and the fixed core to bias the plunger to one side in the axial direction, and the other axial side of the plunger is in contact between the plunger and the fixed core. and an annular non-magnetic sheet member having a second through hole through which the rod-shaped body can pass.

According to one aspect of the solenoid device of the present invention, the non-magnetic sheet member is arranged between the plunger and the fixed core. can be smoothly separated from each other, and the sheet member can be prevented from falling off from the fixed core, thereby improving the assembling workability of the solenoid device.

FIG. 1 is a cross-sectional view showing a first embodiment of an electromagnetic valve. 2 is an enlarged view of the vicinity of the sheet member shown in FIG. 1. FIG. FIG. 3 is an enlarged cross-sectional view of the vicinity of the seat member in the second embodiment of the solenoid valve. FIG. 4 is an enlarged cross-sectional view of the vicinity of the seat member in the third embodiment of the solenoid valve. FIG. 5 is an enlarged cross-sectional view of the vicinity of the seat member in the fourth embodiment of the solenoid valve.

An embodiment of a solenoid valve using the solenoid device of the present invention will be described with reference to FIGS. 1 to 5. FIG.
In the following, for convenience of explanation, the three axes orthogonal to each other are set as the X-axis, the Y-axis and the Z-axis. As an example, the XY plane including the X axis and the Y axis is horizontal, and the Z axis is vertical.
Further, the X-axis direction is sometimes referred to as the "axis O direction", the radial direction about the axis O is simply referred to as the "radial direction", and the circumferential direction about the axis O is simply referred to as the "circumferential direction". .

The positive side in the X-axis direction corresponds to "one side in the direction of the axis O", and the negative side in the X-axis direction corresponds to "the other side in the direction of the axis O".
In this specification, the vertical direction, horizontal direction, upper side, and lower side are terms used simply to describe the relative positional relationship of each part. Therefore, the actual positional relationship and the like of each part may differ from the positional relationship and the like indicated by these terms.

<First embodiment>
First, a first embodiment of the solenoid valve will be described.
As shown in FIGS. 1 and 2, the electromagnetic valve 100 has a solenoid device 1 and a valve mechanism 10 mounted on the positive side of the solenoid device 1 in the X-axis direction.
The solenoid valve 100 is mounted on an automobile, for example, and used as a switching device for switching between passing and blocking of a fluid Q such as liquid or gas.
The valve mechanism 10 includes a cylindrical nozzle 20 and a cylindrical spool valve 30 arranged in the nozzle 20 so as to be movable along the X-axis direction.

A space between the nozzle 20 and the spool valve 30 constitutes a channel F through which the fluid Q passes. Further, the nozzle 20 is formed with a plurality of side holes 201 penetrating through the cylindrical wall and communicating with the flow path F. As shown in FIG. Note that the passing direction of the fluid Q may be opposite to that shown in the drawing.
In addition, a plurality of seal members 40 are arranged along the X-axis direction along the outer periphery of the nozzle 20 at intervals. Each sealing member 40 is a ring-shaped member having elasticity, and can prevent the fluid Q from leaking. Each seal member 40 is made of, for example, an elastic material such as urethane rubber.

The nozzle 20 has a flange portion 202 protruding radially outward at its end on the negative side in the X-axis direction. The opening edge of the case 9 (case body 91 ) of the solenoid device 1 on the positive side in the X-axis direction is caulked to the outer peripheral edge of the flange portion 202 . Thereby, the valve mechanism 10 is connected to the solenoid device 1 .
A gasket 50 is arranged in a compressed state between the flange portion 202 and the solenoid device 1 (ring member 7). Due to the presence of this gasket 50, the space between the valve mechanism 10 and the solenoid device 1 is airtightly sealed. The gasket 50 is made of an elastic material such as urethane rubber, like the sealing member 40 .

The solenoid device 1 has a bobbin 2 , a plunger 3 , a coil 4 , a stationary core 5 , a ring member 7 and a case 9 .
The bobbin 2 is a tubular member having a through hole 21 . The through hole 21 penetrates the bobbin 2 along the X-axis direction. Moreover, the inner diameter of the through-hole 21 is constant along the X-axis direction.
The bobbin 2 is made of, for example, various resin materials such as polyester and polyimide.
A coil 4 formed by winding a conductive wire is arranged on the outer peripheral portion 22 of the bobbin 2 .

The plunger 3 is inserted into the through hole 21 of the bobbin 2 from the positive side in the X-axis direction, and the fixed core 5 is inserted from the negative side in the X-axis direction.
As the coil 4 is energized, a magnetic field is generated to excite the stationary core 5 . Then, the plunger 3 is attracted to the fixed core 5 thus excited. Thereby, the plunger 3 can be moved along the X-axis direction. That is, the plunger 3 is movably supported along the X-axis direction.
The fixed core 5 has a flange portion 59 protruding radially outward at the end on the negative side in the X-axis direction. The fixed core 5 is positioned in the X-axis direction with respect to the bobbin 2 (coil 4) by the contact of the flange portion 59 with the bobbin 2. As shown in FIG.

In addition, the fixed core 5 has a recessed portion 51 recessed toward the negative side in the X-axis direction on the surface on the positive side in the X-axis direction. The recess 51 has a bottom surface 511 perpendicular to the axis O (X-axis) and an inner peripheral surface (second inclined surface) 512 .
The inner peripheral surface 512 is inclined with respect to the axis O so as to move away from the axis O from the X-axis direction negative side toward the positive side. In other words, the inner diameter of the concave portion 51 gradually increases from the X-axis direction negative side toward the positive side.

A hole portion 52 recessed toward the negative side in the X-axis direction is formed in the radial center portion of the bottom surface 511 . An end portion of a pin (rod-shaped body) 53 on the negative side in the X-axis direction is inserted (press-fitted) into the hole portion 52 . Further, the pin 53 has an enlarged diameter portion 531 at the end portion on the positive side in the X-axis direction.
The functions of the hole portion 52 and the pin 53 will be detailed later.
The fixed core 5 is made of, for example, a soft magnetic material (soft magnetic metal material) such as iron. Thereby, the plunger 3 can be excited so as to be sufficiently attracted. The pin 53 may also be made of the same soft magnetic material as the fixed core 5, or may be made of a material other than the soft magnetic material.

A gasket 61 is arranged between the flange portion 59 of the fixed core 5 and the bobbin 2, and a gasket 62 is arranged between the ring member 7 and the bobbin 2 in a compressed state.
These gaskets 61 and 62 are ring-shaped and arranged concentrically with the through hole 21 of the bobbin 2 . The existence of the gaskets 61 and 62 hermetically seals between the bobbin 2 and the flange portion 59 and the ring member 7 .
The gaskets 61 and 62 are made of an elastic material such as urethane rubber, like the seal member 40 .

The plunger 3 has a recessed portion 31 recessed toward the negative side in the X-axis direction on its surface on the positive side in the X-axis direction. An end portion of the spool valve 30 of the valve mechanism 10 on the negative side in the X-axis direction is press-fitted into the concave portion 31 . As a result, the spool valve 30 can also move along the X-axis direction as the plunger 3 moves along the X-axis direction.
In addition, the plunger 3 has a recessed portion 32 recessed toward the positive side in the X-axis direction on its surface on the negative side in the X-axis direction.
In the present embodiment, the recessed portion 31 and the recessed portion 32 are connected to each other by a through hole passing through the plunger 3 along the X-axis direction. The inner diameter of this through hole is set smaller than the inner diameter of the recess 31 . Therefore, a protrusion 33 is formed at the boundary between the recess 31 and the recess 32 .

The plunger 3 also has an outer peripheral surface (first inclined surface) 34 at the end on the negative side in the X-axis direction. The outer peripheral surface 34 is inclined with respect to the axis O so as to approach the axis O from the X-axis direction positive side to the negative side. In other words, the outer diameter of the end of the plunger 3 on the X-axis direction negative side gradually decreases from the X-axis direction positive side toward the negative side.
When the plunger 3 is closest to the fixed core 5 , the end of the plunger 3 on the negative side in the X-axis direction is positioned inside the recess 51 of the fixed core 5 . The outer peripheral surface 34 of the plunger 3 faces the inner peripheral surface 512 of the recess 51 . Such a configuration makes it difficult for interference to occur between the plunger 3 and the fixed core 5, so that they can be smoothly approached and separated from each other.

Between the plunger 3 and the fixed core 5, a coil spring 8 that biases the plunger 3 to the positive side in the X-axis direction, and a non-magnetic sheet member S are arranged.
The coil spring 8 contacts the bottom surface 321 (protruding portion 33) of the concave portion 32 of the plunger 3 on the positive side in the X-axis direction, and contacts the sheet member S on the negative side in the X-axis direction.
In the non-excited state of the fixed core 5, the coil spring 8 can move the plunger 3 toward the positive side in the X-axis direction. Therefore, by switching the stationary core 5 between the excited state and the non-excited state, the plunger 3 can be alternately moved to the negative side and the positive side along the X-axis direction (that is, reciprocated).

On the other hand, the sheet member S is pressed toward the fixed core 5 by contacting the sheet member S with the negative side of the coil spring 8 in the X-axis direction. Thereby, the sheet member S is fixed in contact with the bottom surface 511 of the concave portion 51 of the fixed core 5 .
By forming recesses 32 and recesses 51 in plunger 3 and fixed core 5, respectively, and arranging coil spring 8 and seat member S inside these, the length of solenoid device 1 (solenoid valve 100) in the X-axis direction can be reduced. can do.
Also, the negative side of the plunger 3 in the X-axis direction comes into contact with the sheet member S when the plunger 3 is closest to the fixed core 5 . With this configuration, the plunger 3 and the fixed core 5 can be smoothly separated from each other even if the magnetic force remains when the coil 4 is de-energized and the fixed core 5 is brought into the non-excited state.

As shown in FIG. 2, the sheet member S has an annular through-hole (second through-hole) S1 penetrating in the X-axis direction. The pin 53 is press-fitted into the hole 52 after the end on the negative side in the X-axis direction passes through the through hole S1 of the sheet member S. As shown in FIG. With such a configuration, it is possible to prevent the sheet member S from falling off from the fixed core 5 during the operation of assembling the solenoid device 1 (solenoid valve 100). Therefore, the assembling workability of the solenoid device 1 (solenoid valve 100) can be enhanced.
As described above, after the solenoid device 1 is assembled, the sheet member S is fixed to the fixed core 5 by the pressing force of the coil spring 8. Therefore, the pin 53 may be removed from the fixed core 5 or left as it is. state. That is, the pin 53 functions to temporarily fix the seat member S to the fixed core 5 when assembling the solenoid device 1 (solenoid valve 100).

The thickness of the sheet member S is preferably about 0.1-0.3 mm, more preferably about 0.15-0.25 mm. As a result, when the fixed core 5 is brought into the non-excited state, the attractive force (effect of residual magnetic force) of the fixed core 5 on the plunger 3 can be sufficiently reduced.
Such a sheet member S is made of, for example, stainless steel.

The length (protrusion length) P of the expanded diameter portion 531 of the pin 53 protruding from the fixed core 5 is set larger than the thickness of the sheet member S. As shown in FIG. With such a configuration, when the solenoid device 1 is assembled, the expanded diameter portion 531 does not contact the sheet member S, so that the sheet member S can be prevented from being unintentionally deformed. The protrusion length P is defined by the difference between the length L of the portion of the pin 53 excluding the enlarged diameter portion 531 (the main body of the pin 53 ) and the depth D of the hole portion 52 .
In addition, the X-axis direction negative side of the plunger 3 contacts a portion of the sheet member S radially outer than the portion with which the coil spring 8 contacts. According to such a configuration, the center portion of the sheet member S in the radial direction can be pressed by the coil spring 8 , so that the sheet member S can be fixed to the fixed core 5 more reliably.

Furthermore, the portion of the expanded diameter portion 531 on the positive side in the X-axis direction has an outer diameter that decreases from the negative side in the X-axis direction toward the positive side, and the outer peripheral surface thereof is tapered. Therefore, when the solenoid device 1 is assembled, even if the end portion of the coil spring 8 on the negative side in the X-axis direction contacts the enlarged diameter portion 531 of the pin 53, the enlarged diameter portion 531 is exceeded to the sheet member S side ( That is, it can reliably move to a predetermined position.
The fixing of the pin 53 to the hole portion 52 is not limited to press-fitting and may be screwed. With either method, the pin 53 can be reliably fixed to the hole 52 . However, by screwing, even if a defect (crack, chip, etc.) occurs in the sheet member S when assembling the solenoid device 1, it is relatively easy to replace it with a new sheet member S. .

Case 9 accommodates bobbin 2 , plunger 3 , coil 4 , fixed core 5 and ring member 7 . The case 9 has a case body 91 and a connector member 92 .
The case main body 91 is a tubular member extending along the X-axis direction. By crimping the two opening edges of the case body 91 respectively, the outer peripheral edge of the flange portion 202 of the nozzle 20 and the outer peripheral edge of the flange portion 59 of the fixed core 5 are covered. As a result, the bobbin 2, plunger 3, coil 4, fixed core 5, and ring member 7 are accommodated in the case 9, and the respective parts are fixed to assemble the solenoid device 1. As shown in FIG.

Like the fixed core 5, the case body 91 is made of, for example, a soft magnetic metal material such as iron.
A connector (not shown) for energizing the coil 4 is connected to the connector member 92 . The connector member 92, like the bobbin 2, is made of, for example, a resin material.

<Second embodiment>
Next, a second embodiment of the solenoid valve will be described.
FIG. 3 is an enlarged cross-sectional view of the vicinity of the seat member in the second embodiment of the solenoid valve.
In the following, the electromagnetic valve 100 of the second embodiment will be described with a focus on the points that differ from the electromagnetic valve 100 of the first embodiment, and the description of the same items will be omitted.

The solenoid valve 100 of the second embodiment has a groove 513 formed along the circumferential direction at the boundary between the bottom surface 511 and the inner peripheral surface 512 in the recess 51 of the fixed core 5. It is similar to the solenoid valve 100 of one embodiment.
The groove 513 can accommodate the outer peripheral edge of the sheet member S as shown in FIG. 3(a), or can accommodate the adhesive A as shown in FIG. 3(b). As a result, the sheet member S can be more reliably fixed to the fixed core 5 .
For the adhesive A, for example, an epoxy-based adhesive, an epoxy-based adhesive, or the like can be used.

<Third Embodiment>
Next, a third embodiment of the solenoid valve will be described.
FIG. 4 is an enlarged cross-sectional view of the vicinity of the seat member in the third embodiment of the solenoid valve.
In the following, the solenoid valve 100 of the third embodiment will be mainly described with respect to the differences from the solenoid valve 100 of the first embodiment, and the description of the same items will be omitted.

The solenoid valve 100 of the third embodiment is similar to the solenoid valve 100 of the first embodiment except for the configuration of the pin fixed to the fixed core 5 .
The pin 54 of the third embodiment protrudes toward the X-axis direction positive side from the bottom surface (X-axis direction positive side surface) 511 of the recessed portion 51 of the fixed core 5, and constitutes one member together with the fixed core 5. It is a protruding object (rod-shaped body) that
Before the solenoid device 1 is assembled, the pin 54 has a cylindrical shape as indicated by the two-dot chain line in FIG.

On the other hand, when assembling the solenoid device 1 , after the cylindrical pin 54 is passed through the through hole S<b>1 of the sheet member S, the end portion on the positive side in the X-axis direction is deformed to form the enlarged diameter portion 541 . Thereby, it is possible to prevent the sheet member S from falling off from the fixed core 5 . Therefore, the assembling workability of the solenoid device 1 can be improved.

<Fourth Embodiment>
Next, a fourth embodiment of the solenoid valve will be described.
FIG. 5 is an enlarged cross-sectional view of the vicinity of the seat member in the fourth embodiment of the solenoid valve.
In the following, the solenoid valve 100 of the fourth embodiment will be mainly described with respect to the differences from the solenoid valve 100 of the first embodiment, and the description of the same matters will be omitted.
The solenoid valve 100 of the fourth embodiment is similar to the solenoid valve 100 of the first embodiment except that the pin 53 is omitted.

The solenoid valve 100 of the fourth embodiment can be assembled as follows.
First, the tip bar (rod-shaped body) of the jig is passed through the through hole S1 of the sheet member S and its end is inserted into the hole 52 . This prevents the sheet member S from coming off the fixed core 5 . Further, the distal end portion of the distal end bar may be provided with a protruding portion that protrudes radially outward and exhibits the same function as the enlarged diameter portion 531 .
Next, in this state, after arranging, for example, the coil spring 8, plunger 3, ring member 7, spool valve 30, and nozzle 20 in this order along the tip bar, the opening of the case body 91 on the positive side in the X-axis direction is Crimp the edges.
After that, the jig is separated from the solenoid valve 100 .

Although the illustrated embodiments of the solenoid device of the present invention have been described above, the present invention is not limited to this, and each part constituting the solenoid device may have any configuration capable of exhibiting similar functions. can be replaced with Moreover, arbitrary components may be added.
For example, the concave portion 31 and the concave portion 32 of the plunger 3 do not have to be connected. However, since the solenoid valve 100 of the fourth embodiment is assembled as described above, the recess 31 and the recess 32 need to be connected.

Further, the biasing member is not limited to a coil spring, and may be a leaf spring, a torsion spring, or the like.
Further, the member attached to the solenoid device is not limited to the valve mechanism 10, and may be a valve body having a spool valve accommodated in a spool hole.

DESCRIPTION OF SYMBOLS 1... Solenoid apparatus, 2... Bobbin, 21... Through hole, 22... Peripheral part, 3... Plunger, 31... Recessed part, 32... Recessed part, 321... Bottom surface, 33... Protruding part, 34... Outer peripheral surface, 4... Coil, 5 Fixed core 50 Gasket 51 Concave portion 511 Bottom surface 512 Inner peripheral surface 513 Groove 52 Hole portion 53, 54 Pin 531, 541 Expanded diameter portion 59 Flange portion 61, 62... gasket, 7... ring member, 8... coil spring, 9... case, 91... case body, 92... connector member, O... shaft, S... sheet member, S1... through hole (second through hole), A Adhesive 10 Valve mechanism 20 Nozzle 201 Side hole 202 Flange 30 Spool valve 40 Seal member 100 Solenoid valve Q Fluid F Flow path P Protrusion Length, L...Length, D...Depth

Claims (10)

a cylindrical bobbin having a through hole extending along the axial direction;
a plunger inserted into one axial side of the through hole and supported so as to be axially movable;
a coil that is wound around the outer periphery of the bobbin, generates a magnetic force when energized, and moves the plunger along the axial direction;
a fixed core inserted into the through hole on the other side in the axial direction;
a biasing member disposed between the plunger and the fixed core and biasing the plunger to one side in the axial direction;
An annular non-magnetic sheet member disposed between the plunger and the fixed core so that the other side of the plunger in the axial direction is in contact, and having a second through hole through which a rod-shaped member can pass. A solenoid device characterized by: The fixed core has a hole recessed toward the other axial side on its one axial side surface,
2. The solenoid device according to claim 1, wherein the rod-like body is a pin partly inserted into the hole or a jig partly inserted into the hole. 3. The solenoid device according to claim 2, wherein the pin is press-fitted or screwed into the hole. 2. The solenoid device according to claim 1, wherein the rod-like body is a pin that protrudes from the surface of the fixed core on one side in the axial direction toward the one side in the axial direction and forms a member together with the fixed core. The solenoid device according to any one of claims 2 to 4, wherein the pin has an enlarged diameter portion at one axial end thereof. 6. A solenoid device according to claim 5, wherein a length of said enlarged diameter portion protruding from said fixed core is greater than the thickness of said sheet member. The solenoid device according to any one of claims 1 to 6, wherein the sheet member is pressed toward the fixed core by the other side of the biasing member in the axial direction coming into contact with the sheet member. The plunger has a concave portion recessed in one axial direction on the surface on the other axial side,
The solenoid device according to any one of claims 1 to 7, wherein one axial side of said biasing member is in contact with the bottom surface of said recess of said plunger. The fixed core has a concave portion recessed toward the other axial side on one surface in the axial direction,
The solenoid device according to any one of claims 1 to 8, wherein the sheet member is in contact with the bottom surface of the recess of the fixed core. 10. The solenoid device according to claim 9, wherein the recess has a groove formed along the circumferential direction at the boundary between the bottom surface and the inner peripheral surface.

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