JP2020126916A - Solenoid device - Google Patents

Abstract

To provide a solenoid device that can smoothly drive a plunger supported in a yoke while ensuring the coaxiality between a core and a yoke, and can sufficiently generate a magnetic circuit when the plunger is driven by the magnetic force of a coil in the energized state.SOLUTION: A solenoid device 1 includes a bobbin 2, a coil 3 wound around the bobbin 2, a core 4 made of a magnetic material and arranged in the bobbin 2, a yoke 5 made of a magnetic material and disposed in the bobbin 2 and magnetically discontinuously adjacent to the core 4, and a resin member 6 that holds the core 4 and the yoke 5 in a magnetically discontinuous state, and the core 4 has a first inclined surface 41 forming a boundary groove 11 at a boundary with the yoke 5, and at least one ring-shaped first groove 42, and the resin member 6 is arranged in the boundary groove 11 and the first groove 42, and is in close contact with the first inclined surface 41.SELECTED DRAWING: Figure 1

Description

The present invention relates to a solenoid device.

BACKGROUND ART Conventionally, as a vehicle-mounted solenoid valve, the solenoid valve described in Patent Document 1 is known. The solenoid valve described in Patent Document 1 includes a coil bobbin, a coil wound outside the coil bobbin, a fixed core arranged inside the coil bobbin, and a yoke arranged inside the coil bobbin and on one end side of the fixed core. With.

JP, 2005-277306, A

In the solenoid valve described in Patent Document 1, the fixed core has a cylindrical shape with no irregularities on the outer peripheral surface, and is simply inserted inside the coil bobbin. Similarly, the yoke also has a cylindrical shape with no unevenness particularly on the outer peripheral surface, and is simply inserted inside the coil bobbin. In such a configuration, the fixed core and the yoke may be displaced in the coil bobbin depending on the degree of vibration of the automobile. In this case, coaxiality between the fixed core and the yoke cannot be ensured, and the movable core supported in the yoke cannot be driven smoothly.

Further, when the movable core is driven by the magnetic force generated from the coil in the energized state, if the yoke is displaced, the magnetic circuit between the yoke and the coil cannot be sufficiently generated, and the movable core cannot be driven. Will be insufficient.

An object of the present invention is to ensure coaxiality between the core and the yoke, to smoothly drive the plunger supported in the yoke, and to drive the plunger by the magnetic force of the coil in the energized state. It is an object of the present invention to provide a solenoid device that can sufficiently generate a magnetic circuit.

One aspect of the solenoid device of the present invention is a tubular bobbin having a through hole penetrating along the axial direction, a coil wound around the outer periphery of the bobbin, and a magnetic material, and the axial direction of the through hole. A cylindrical core arranged on one end side of the core, and a cylindrical yoke made of a magnetic material and arranged on the other end side of the through hole in the axial direction and adjacent to each other without being magnetically continuous with the core. And a cylindrical resin member that holds the yoke in a magnetically discontinuous state, and the core has a tapered portion at an end portion in the axial direction whose outer diameter gradually decreases toward the other end side in the axial direction. And a first inclined surface that forms a boundary groove at the boundary with the yoke, and at least one ring-shaped first groove that is located axially one end side of the first inclined surface and that extends in the circumferential direction. Then, the resin member is arranged in the boundary groove and the first groove and is in close contact with the first inclined surface.

According to one aspect of the solenoid device of the present invention, it is possible to ensure coaxiality between the core and the yoke and smoothly drive the plunger supported in the yoke. Moreover, when the plunger is driven by the magnetic force of the coil in the energized state, the magnetic circuit can be sufficiently generated.

FIG. 1 is a vertical sectional view showing an embodiment of a solenoid device of the present invention. FIG. 2 is a vertical sectional view showing a core/yoke unit in which a core and a yoke included in the solenoid device shown in FIG. 1 are connected. FIG. 3 is an exploded perspective view of the core/yoke unit shown in FIG. 4A to 4D are vertical cross-sectional views sequentially showing a process of manufacturing the core/yoke unit shown in FIG. 5A to 5C are vertical cross-sectional views sequentially showing a process of manufacturing the core/yoke unit shown in FIG. 6A to 6C are vertical sectional views sequentially showing a process of manufacturing the core/yoke unit shown in FIG.

Hereinafter, a solenoid device of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.
An embodiment of the solenoid device of the present invention will be described with reference to FIGS. In the following, for convenience of explanation, three axes orthogonal to each other are set as the X axis, the Y axis, and the Z axis. The XY plane including the X axis and the Y axis is horizontal, and the Z axis is vertical. A direction parallel to the X-axis is referred to as "axial direction (axis O ₂ direction)", a radial direction around this axis is simply referred to as "radial direction", and a circumferential direction around the axis is simply referred to as "circumferential direction". ". The positive side in the X-axis direction may be referred to as “one side in the axial direction” or simply “one side”, and the negative side in the X-axis may be referred to as “the other side in the axial direction” or simply “the other side”. In the present specification, the up-down direction, the horizontal direction, the upper side and the lower side are simply names for explaining the relative positional relationship between the respective parts, and the actual positional relationship and the like are the positional relationship and the like indicated by these names. Other arrangement relationships may be used.

The solenoid device 1 shown in FIG. 1 controls hydraulic pressure in a hydraulic circuit in an automatic transmission of an automobile, for example. The solenoid device 1 includes a case 7, a bobbin 2, a coil 3, a core/yoke unit 10, a plunger 13, a plunger pin 14, a ring member 8, and a valve sleeve 15.
The case 7 has a bottomed tubular shape. That is, the case 7 is a tubular member having an opening 71 that is open at one end side (one end side in the axial direction) and a wall part 74 that closes the other end side (the other end side in the axial direction). The case 7 is made of a magnetic metal material such as iron.

The bobbin 2 is arranged inside the case 7. The bobbin 2 has a tubular shape, and its axis O ₂ is arranged parallel to the X-axis direction.
Further, the bobbin 2 has a through hole 22 penetrating along the axis O ₂ direction. The inner diameter of the through hole 22 is constant along the direction of the axis O ₂ .

The bobbin 2 has a flange 23 protruding in the radial direction at one end side and a flange 24 protruding in the radial direction at the other end side. The flange 24 is in contact with the wall portion 74 of the case 7.
Like the case 7, the bobbin 2 is made of a magnetic metal material.

A coil 3 having conductivity is wound around the outer peripheral portion 21 of the bobbin 2. By energizing the coil 3, the case 7, the bobbin 2, the core 4 and the yoke 5 of the core/yoke unit 10 form a magnetic circuit. This allows the plunger 13 to reciprocate along the axis O ₂ direction.

Core yoke unit 10 includes a core 4 disposed at one end side in the axial O ₂ direction, the yoke 5 disposed at the other end side in the axial O ₂ direction, which is disposed across the core 4 and the yoke 5 And a resin member 6.
As shown in FIG. 3, the core 4 has a cylindrical shape as a whole, and its axis O ₄ is arranged parallel to the X-axis direction. The axis O _{4 of the} core 4 overlaps the axis O _{2 of the} bobbin 2.

The yoke 5 is also cylindrical as a whole, and its axis O ₅ is arranged parallel to the X-axis direction. The axis O _{5 of the} yoke 5 also overlaps the axis O _{2 of the} bobbin 2.
Similar to the core 4 and the yoke 5, the resin member 6 has a cylindrical shape as a whole, and its axis O ₆ is arranged parallel to the X-axis direction. Axis _{O 6} of the resin member 6 also overlaps the axis _{O 2} of the bobbin 2.
The core 4, the yoke 5, and the resin member 6 each have a cylindrical shape in the present embodiment, but are not limited to this, and may have, for example, a rectangular tube shape.

The core 4 and the yoke 5 are made of a magnetic material such as iron, that is, made of a magnetic metal material. As a result, it is possible to generate a magnetic circuit that allows the plunger 13 to reciprocate sufficiently.
Further, as shown in FIGS. 1 and 2, the core 4 and the yoke 5 are adjacent to each other in the direction of the axis O ₂ , but are separated from each other. As a result, the core 4 and the yoke 5 are in a magnetically discontinuous state (hereinafter referred to as “magnetically discontinuous state”). Here, the "magnetically discontinuous state" means a state in which the magnetic circuit is not directly connected. In order to make the magnetically discontinuous state, apart from separating the core 4 and the yoke 5, for example, the core 4 and the yoke 5 are in contact with each other, but at least one of the core 4 and the yoke 5 It is possible to apply a non-magnetic coating to the surface of the.

The resin member 6 holds the core 4 and the yoke 5 in a magnetically discontinuous state. For the resin member 6, for example, various resin materials such as thermoplastic resin can be used.
Inside the core/yoke unit 10 having such a structure, a plunger 13 made of a magnetic material is supported so as to be capable of reciprocating along the axis O ₂ direction. Inside the core/yoke unit 10, a plunger pin 14 is arranged at one end side of the plunger 13. When the plunger 13 reciprocates, the force is transmitted to the valve (not shown) that switches the hydraulic circuit via the plunger pin 14. As a result, the valve can be operated.

As shown in FIG. 1, an annular ring member 8 is inserted in the case 7. The ring member 8 is arranged concentrically with the core/yoke unit 10. The ring member 8 contacts the core 4 from one end side. The flange 151 of the valve sleeve 15 is in contact with one end of the ring member 8. Further, the flange 151 contacts a bent portion 73 formed by bending the opening 71 side of the case 7 inward. As a result, the position of the core yoke unit 10 in the direction of the axis O ₂ can be regulated between the bent portion 73 and the wall portion 74 of the case 7, and thus the magnetic circuit can be stably constructed.

As shown in FIG. 2, the core 4 has a reduced diameter portion 44 having an outer diameter φd _4A reduced at one end. The reduced diameter portion 44 penetrates the ring member 8. Thereby, the radial position of the ring member 8 can be regulated.
Further, the core 4 has a large diameter portion 45 adjacent to the other end side of the reduced diameter portion 44 and having an outer diameter φd _4A larger than that of the reduced diameter portion 44. The ring member 8 is in contact with the large diameter portion 45. Thereby, the position of the ring member 8 in the direction of the axis O ₂ can be regulated.

Next, a detailed structure of the core/yoke unit 10 will be described.
As described above, the core yoke unit 10 includes a core 4 disposed at one end side in the axial O ₂ direction, the yoke 5 disposed at the other end side in the axial O ₂ direction, the core 4 and the yoke 5 It has the resin member 6 arrange|positioned straddling.

As shown in FIGS. 2 and 3, the core 4, the outer peripheral portion, the first inclined surface 41 located at the other end portion of the shaft O ₂ direction, the axial O ₂ direction of the one end side of the first inclined surface 41 And a first groove 42 located at.
The first inclined surface 41 is composed of a tapered portion whose outer diameter φd _4A gradually decreases toward the other end in the direction of the axis O ₂ . The first inclined surface 41 can form the boundary groove 11 at the boundary with the yoke 5.
The above-described reduced diameter portion 44 is located on one end side with respect to the first inclined surface 41, and the above-described large diameter portion 45 is located between the first inclined surface 41 and the reduced diameter portion 44. doing.

The first groove 42 is a ring-shaped groove extending in the circumferential direction of the core 4. The number of the first grooves 42 arranged is one in the present embodiment, but is not limited to this and may be plural. For example, when the number of the first grooves 42 arranged is three or more, it is preferable that the first grooves 42 are arranged at equal intervals along the direction of the axis O ₂ .
Further, as shown in FIG. 3, between the first inclined surface 41 and the first groove 42, a high portion 46 and a low portion 47 having different heights along the radial direction are mutually provided around the axis O _4. It is located in.

Yoke 5 has an outer peripheral portion, and the second inclined surface 51 positioned at one end of the shaft O ₂ direction, and a second groove 52 located on the other end side in the axial O ₂ direction than the second inclined surface 51 ..
The second inclined surface 51 is composed of a tapered portion whose outer diameter φd _5A gradually decreases toward one end in the direction of the axis O ₂ . The second inclined surface 51 can form the boundary groove 11 together with the first inclined surface 41. Then, as shown in FIG. 2, the inclination angle theta ₄₁ of the first inclined surface 41, the inclination angle theta ₅₁ of the second inclined surface 51, of the same size. Accordingly, for example, when the core/yoke unit 10 is manufactured, the first inclined surface 41 and the second inclined surface 51 can be formed quickly, and thus the manufacturability is improved. The inclination angle θ ₄₁ and the inclination angle θ ₅₁ have the same magnitude, but are not limited to this and may be different.

The second groove 52 is a ring-shaped groove extending along the circumferential direction of the yoke 5. Although the number of the second grooves 52 arranged is one in the present embodiment, the number is not limited to this and may be plural. For example, when the number of the second grooves 52 arranged is three or more, it is preferable that the second grooves 52 are arranged at equal intervals along the direction of the axis O ₂ .
Further, as shown in FIG. 3, between the second inclined surface 51 and the second groove 52, a high portion 56 and a low portion 57 having different heights along the radial direction are provided around each other around the axis O _5. It is located in.

Distance _{L 4} of the first inclined surface 41 along the axial _{O 2} direction and the first groove 42 is longer than the distance _{L 5} between the second inclined surface 51 along the axial _{O 2} direction and the second groove 52. As a result, the first groove 42 can be separated from the first inclined surface 41, so that the length of the first inclined surface 41 along the axis O ₂ direction should be large enough to secure a magnetic circuit. You can

Further, the width _{W 42} of the first groove 42, the width _{W 52} of the second groove 52 are the same size, the depth _{dp 42} of the first groove 42, the depth _{dp 52} of the second groove 52 Are the same size. Thereby, for example, when the core/yoke unit 10 is manufactured, the first groove 42 and the second groove 52 can be formed quickly, and thus the manufacturability is improved.

The width W ₄₂ and the width W ₅₂ have the same size, but are not limited to this and may be different. Similarly, the depth dp ₄₂ and the depth dp ₅₂ have the same size, but are not limited to this and may be different.
Further, the depth dp ₄₂ is smaller than the width W ₄₂ , and the depth dp ₅₂ is smaller than the width W ₅₂ . As a result, the depth dp ₄₂ and the depth dp ₅₂ can be set relatively shallow, which is preferable for the magnetic circuit.

As shown in FIG. 2, the resin member 6 is arranged in the boundary groove 11, the first portion 64, the second portion 65 arranged in the first groove 42, and the second portion 52. And a third portion 66.
The first portion 64 fills the entire boundary groove 11 and is in close contact with both the first inclined surface 41 and the second inclined surface 51.
The second portion 65 fills the entire inside of the first groove 42 and is in close contact with the inner surface of the first groove 42.
The third portion 66 fills the entire second groove 52 and is in close contact with the inner surface of the second groove 52.

Due to the first portion 64, the second portion 65, and the third portion 66, the core 4 and the resin member 6 are caught by each other, the contact area between the core 4 and the resin member 6 is increased, and the yoke 5 and the resin member 6 are increased. 6, the contact area between the yoke 5 and the resin member 6 increases. As a result, even if vibrations from, for example, an automobile engine are transmitted to the core/yoke unit 10, the core 4 and the yoke 5 are prevented from being displaced from each other, and the coaxiality between the core 4 and the yoke 5 is prevented. You can secure enough. If the coaxiality between the core 4 and the yoke 5 is sufficiently ensured, the plunger 13 in the core/yoke unit 10 can be smoothly driven.
Further, as described above, the core 4 and the yoke 5 constitute a magnetic circuit when driving the plunger 13. Further, by preventing the positional deviation between the core 4 and the yoke 5, it is possible to sufficiently generate a magnetic circuit that drives the plunger 13 quickly.

The first portion 64 is in a state of filling the entire inside of the boundary groove 11, but it is not limited to this, and may be in a state of filling part of the inside of the boundary groove 11. Similarly, the second portion 65 is in a state of filling the entire first groove 42, but is not limited to this, and may be in a state of partially filling the first groove 42. .. Further, the third portion 66 is also in a state of filling the entire second groove 52, but is not limited to this, and may be in a state of partially filling the second groove 52.
Further, in the yoke 5, at least one of the second inclined surface 51 and the second groove 52 may be omitted.

As shown in FIG. 3, the resin member 6 has a plurality of first through holes 61 at one end and a plurality of second through holes 62 at the other end.
The plurality of first through holes 61 are arranged at equal intervals along the circumferential direction of the resin member 6. Then, in each of the first through holes 61, the high portion 46 between the first inclined surface 41 of the core 4 and the first groove 42 enters from the inside of the resin member 6 and projects outward. As a result, the core 4 is hooked on the resin member 6.

The plurality of second through holes 62 are also arranged at equal intervals along the circumferential direction of the resin member 6. The high portion 56 between the second inclined surface 51 of the yoke 5 and the second groove 52 enters the second through hole 62 from the inside of the resin member 6 and projects outward. As a result, the yoke 5 is hooked on the resin member 6.

When the one end side and the other end side of the resin member 6 are in such a hooked state, it is possible to prevent the core 4 and the yoke 5 from coming off from the resin member 6, and thus, the core 4 and the yoke 5 are separated. The positional relationship of can be stably maintained.
The number of the first through holes 61 and the second through holes 62 arranged is not limited to a plurality, and may be one. Further, the number of the first through holes 61 arranged and the number of the second through holes 62 may be the same or different.

As shown in FIG. 2, the resin member 6 has an inner groove 63 between the core 4 and the yoke 5, that is, in the inner peripheral portion of the portion located in the boundary groove 11. The inner groove 63 is a ring-shaped groove along the circumferential direction of the resin member 6. The inner groove 63 is connected to the space 43 inside the core 4 and the space 53 inside the yoke 5. Such an inner groove 63 can suppress, for example, distortion (deformation) of the resin member 6 due to temperature change or secular change, thus contributing to smooth driving of the plunger 13 supported in the yoke 5. To do.

The width W ₆₃ of the inner groove 63 is the same as the distance between the core 4 and the yoke 5, but is not limited to this and may be different. The depth _{dp 63} of the inner grooves 63, for example, can be the same as the depth _{dp 42} and depth _{dp 52,} but is not limited thereto.
Next, a method of manufacturing the core/yoke unit 10 will be described with reference to FIGS.

First, a cylindrical base material having a predetermined length and serving as the core 4 and the yoke 5 is prepared. The outer diameter and the inner diameter of this base material are constant along the X-axis direction. Further, the total length of the base material is the same as the total length of the core/yoke unit 10.
Then, the base material is annealed.

Then, the base material is cut. As a result, the base material is brought into the state shown in FIG. Further, in the state shown in FIG. 4, the core 4 and the yoke 5 are not yet separated from each other, and are connected via the thin portion 16.
Next, the base material is plated.

Next, the resin member 6 is provided on the base material by insert molding. As a result, the base material is brought into the state shown in FIG.
Next, by cutting the inside of the base material, the thin portion 16 is removed and the inside groove 63 is provided. As a result, the core 4 and the yoke 5 can be separated from each other, so that the core/yoke unit 10 shown in FIG. 6 is obtained.

The solenoid device of the present invention has been described above with reference to the illustrated embodiment, but the present invention is not limited to this, and each part constituting the solenoid device has an arbitrary configuration capable of exhibiting the same function. Can be replaced with In addition, any constituent may be added.

DESCRIPTION OF SYMBOLS 1... Solenoid device, 2... Bobbin, 21... Outer peripheral part, 22... Through hole, 23... Flange, 24... Flange, 3... Coil, 4... Core, 41... First inclined surface, 42... First groove, 43... Space, 44... Reduced diameter part, 45... Larger diameter part, 46... High part, 47... Low part, 5... Yoke, 51... Second inclined surface, 52... Second groove, 53... Space, 56... High part, 57... Lower part, 6... Resin member, 61... First through hole, 62... Second through hole, 63... Inner groove, 64... First part, 65... Second part, 66... Third part, 7... Case , 71... Opening part, 73... Bent part, 74... Wall part, 8... Ring member, 10... Core/yoke unit, 11... Boundary groove, 13... Plunger, 14... Plunger pin, 15... Valve sleeve, 151... Flange , 16 ... thin portion, dp _{42 ...} depth, dp _{52 ...} depth, dp _{63 ...} depth, L 4 _... distance, L 5 _... distance, O 2 _... shaft, O 4 _... axial, O 5 _... shaft, O ₆ ... Axis, W ₄₂ ... Width, W ₅₂ ... Width, W ₆₃ ... Width, φd _4A ... Outer diameter, φd _5A ... Outer diameter, θ ₄₁ ... Inclination angle, θ ₅₁ ... Inclination angle

Claims (11)

A cylindrical bobbin having a through hole that penetrates along the axial direction,
A coil wound around the outer periphery of the bobbin,
A cylindrical core made of a magnetic material and arranged on one end side in the axial direction of the through hole,
A cylindrical yoke that is made of a magnetic material, is disposed on the other end side in the axial direction of the through hole, and is adjacent to the core without being magnetically continuous,
A tubular resin member that holds the core and the yoke in a magnetically discontinuous state,
The core has a tapered portion having an outer diameter gradually decreasing toward the other end in the axial direction at an end portion in the axial direction, and a first inclined surface forming a boundary groove at a boundary portion with the yoke, Is located on the one end side in the axial direction with respect to the first inclined surface and has at least one ring-shaped first groove along the circumferential direction,
The solenoid device, wherein the resin member is disposed in the boundary groove and the first groove and is in close contact with the first inclined surface. The yoke includes a tapered portion having an outer diameter that gradually decreases toward one end in the axial direction at an end portion in the axial direction, and a second inclined surface that forms the boundary groove together with the first inclined surface; 2 is located on the other end side in the axial direction with respect to the inclined surface, and has at least one ring-shaped second groove along the circumferential direction,
The solenoid device according to claim 1, wherein the resin member is disposed in the second groove and is in close contact with the second inclined surface. The distance between the first inclined surface and the first groove along the axial direction of the bobbin is longer than the distance between the second inclined surface and the second groove along the axial direction of the bobbin. Solenoid device described in. The resin member includes at least one first through hole in which a portion between the first inclined surface of the core and the first groove protrudes, the second inclined surface of the yoke, and the second groove. The solenoid device according to claim 2 or 3, further comprising: at least one second through hole, a portion of which is partially protruding. The solenoid device according to any one of claims 2 to 4, wherein an inclination angle of the first inclined surface and an inclination angle of the second inclined surface have the same magnitude. The solenoid device according to claim 2, wherein the width of the first groove and the width of the second groove have the same size. 7. The solenoid device according to claim 2, wherein the depth of the first groove and the depth of the second groove have the same size. The solenoid device according to claim 2, wherein the resin member fills the second groove. The solenoid device according to claim 1, wherein the resin member fills the boundary groove and the first groove. 10. The resin member has an inner groove connected to a space inside the core and a space inside the yoke, in an inner peripheral portion of a portion located in the boundary groove, according to any one of claims 1 to 9. The solenoid device described. The solenoid device according to claim 1, wherein the core, the yoke, and the resin member each have a cylindrical shape.

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