JP6965619B2 - Solenoid device and control valve - Google Patents

Description

The present invention relates to a solenoid device and a control valve.

A solenoid device is a device that drives a plunger, which is a magnetic material, using a solenoid coil. For example, a solenoid coil generates a magnetic field based on an input current. Further, the plunger can be moved in the axial direction, which will be described later. Therefore, the plunger is magnetized when it receives a magnetic field from the solenoid coil and moves in the axial direction.

Solenoid devices can be applied to various systems. For example, in the field of automobiles, oil pressure is required to drive an automatic transmission (AT, CVT, etc.). In addition, it is necessary to generate flood control for lubrication and cooling of drive parts such as engines and transmissions. These oil pressures are generated by a solenoid valve such as VFS (variable force regulating), and the solenoid device is used as a part of the solenoid valve.

It is desirable that the solenoid device has a short time from passing a current through the solenoid coil until the plunger moves to a predetermined position, that is, has good responsiveness. For that purpose, it is effective to spatially connect the internal space (plunger chamber) in which the plunger can move to the outside of the solenoid device. This is because the inflow and outflow of air in the plunger chamber (hereinafter, the inflow and outflow of air is referred to as breathing) is facilitated, so that the air in the plunger chamber is not compressed or expanded by the movement of the plunger.

The responsiveness of the solenoid device can also be improved by reducing the friction between the plunger and the core surrounding it. For example, if the surface of the plunger is covered with a painted surface portion by plating or the like, the surface of the plunger becomes a smooth surface with less friction. Therefore, the plunger can move smoothly in the solenoid device, and as a result, the responsiveness of the solenoid device can be improved.

However, when the plunger and the shaft pin are integrated, the shaft pin is inserted and fixed in the shaft hole of the plunger in the assembly of the solenoid device. At this time, the shaft pin may come into contact with the peripheral portion of the shaft hole. Further, the plunger and the shaft pin are generally fixed by caulking. At this time, for example, a part of the plunger is deformed by a punch. In such a situation, the painted surface may be peeled off.

In addition, the plunger reciprocates in the plunger chamber in the axial direction at high speed and repeatedly. At this time, the plunger may come into contact with a member in the solenoid device such as a spacer, and the painted surface portion may be peeled off. In this way, the painted surface portion peeled off during the operation of the solenoid device diffuses into the plunger chamber as foreign matter, for example, metal powder. Such foreign matter enters the gap in the plunger chamber, slows the movement of the plunger, and in some cases immobilizes the plunger, causing malfunction of the solenoid device.

Patent Document 1 discloses that the surface of a plunger is covered with a painted surface portion. Further, Patent Document 1 discloses a technique of covering the surface of a plunger with a non-magnetic cylinder instead of a painted surface portion.

Japanese Unexamined Patent Publication No. 2009-147075

In Patent Document 1, the painted surface portion is replaced with a non-magnetic cylinder for the purpose of improving productivity. Therefore, in Patent Document 1, in the structure in which the plunger and the shaft pin are integrated, the problem that the painted surface portion covering the plunger is easily peeled off does not occur. Further, according to Patent Document 1, the painted surface portion is provided on the entire surface of the plunger. That is, Patent Document 1 does not disclose that the painted surface portion is partially provided on the surface of the plunger.

The present invention proposes a technique for improving the responsiveness and reliability of a solenoid device.

The solenoid device according to the first exemplary invention of the present application includes a case, a bobbin having a first cylindrical portion supported in the case and having a first central shaft hole along the axial direction, and the above-mentioned. A core having a coil wound around a first cylindrical portion, a core having a second cylindrical portion arranged in the first central shaft hole and having a second central shaft hole along the axial direction, and a magnetic material. A plunger, which is arranged in the space inside the second cylindrical portion, has a shaft hole extending in the axial direction, and is movable in the axial direction with respect to the second cylindrical portion, and the shaft. It includes a shaft pin that is inserted into the hole. The plunger has a painted surface portion whose surface is coated. The painted surface portion includes the inner surface of the shaft hole, the portion of the axial end surface of the plunger facing the axial direction excluding the peripheral portion surrounding the edge of the shaft hole, and the outer side in the radial direction orthogonal to the axial direction. It is provided on the peripheral surface portion of the plunger facing the plunger.

According to the first exemplary invention of the present application, the responsiveness and reliability of the solenoid device can be improved.

FIG. 1 is a cross-sectional view showing a first example of a solenoid device. FIG. 2 is a cross-sectional view showing a first example of the solenoid device. FIG. 3 is a view of the solenoid device viewed from one side in the axial direction. FIG. 4 is a view of the core viewed from one side in the axial direction. FIG. 5 is a view of the spacer viewed from one side in the axial direction. FIG. 6 is a diagram showing a modified example of the spacer. FIG. 7 is a cross-sectional view showing a second example of the solenoid device. FIG. 8 is a view of the spacer viewed from one side in the axial direction. FIG. 9 is a diagram showing a modified example of the spacer. FIG. 10 is a cross-sectional view showing a third example of the solenoid device. FIG. 11 is a cross-sectional view showing a fourth example of the solenoid device. FIG. 12 is a diagram showing an example of coupling between the plunger and the shaft pin. FIG. 13A is a cross-sectional view showing an embodiment of the painted surface of the plunger. FIG. 13B is a cross-sectional view showing a comparative example of the painted surface of the plunger. FIG. 14 is a diagram showing a first example of a valve system. FIG. 15 is a diagram showing a second example of a valve system. FIG. 16 is a diagram showing a third example of a valve system.

Hereinafter, embodiments will be described with reference to the drawings.
In the embodiment, in order to make the explanation easy to understand, the structure other than the main part of the present invention will be briefly described. Further, in the drawings, the dimensions, shape, number, etc. of each element are also examples, and the purpose is not limited to these.

Further, in the following description, the axial direction means the direction in which the central axis extends, and the radial direction means the direction orthogonal to the central axis. Further, the axial direction indicates a direction parallel to the central axis, that is, a direction of 0 ° with respect to the central axis, and is in a range larger than 0 ° and smaller than 45 ° with respect to the central axis. It shall include the diagonal direction. Similarly, the radial direction indicates a direction orthogonal to the central axis, and includes an oblique direction in a range larger than 0 ° and smaller than 45 ° with respect to the direction orthogonal to the central axis.

Further, the ground side means the ground side, and the heaven side means the sky side. For example, when the direction of the earth's gravity is used as a reference, it is desirable that the earth side is in the direction of -45 ° to + 45 ° with respect to the direction of the earth's gravity, and the heaven side is the direction of the earth's gravity. It is desirable that the direction is in the range of −45 ° to + 45 ° with respect to the direction opposite to the above direction.

<First example of solenoid device>
1 to 4 show a first example of a solenoid device. FIG. 1 shows a state when the plunger is most moved to the other side in the axial direction. FIG. 2 shows a state when the plunger is most moved to one side in the axial direction. FIG. 3 is a view of the solenoid device viewed from one side in the axial direction. FIG. 4 is a view of the core viewed from one side in the axial direction.

The bobbin 10 has, for example, a cylindrical shape that surrounds the central axis 100. The bobbin 10 is a resin molded product such as a polyester resin, an epoxy resin, or PTFE (polytetrafluoroethylene). The bobbin 10 has a first cylindrical portion with a first central shaft hole along the axial direction. The coil (eg, solenoid coil) 11 is wound around the first cylindrical portion of the bobbin 10. The coil 11 is, for example, an enamel wire, a polyurethane wire, a polyester wire, or the like in which a copper wire is covered with a resin.

The first core portion 12A and the second core portion 12B each have a cylindrical shape as a whole, and are arranged in the first central shaft hole of the bobbin 10. The first and second core portions 12A and 12B are provided with a second central shaft hole along the axial direction as a second cylindrical portion. Further, the first core portion 12A has a core bottom portion 12C that covers the second central shaft hole on one side in the axial direction. The plunger 13 is arranged in the plunger chamber 132 formed by the second central shaft holes of the first and second core portions 12A and 12B. Further, the plunger 13 has a first hole 131 penetrating in the axial direction, and is movable in the axial direction in the plunger chamber 132.

The first core portion 12A, the second core portion 12B, the core bottom portion 12C, and the plunger 13 are made of a magnetic material such as iron. When the electric current flows through the coil 11, the coil 11 generates a magnetic field. The first core portion 12A, the second core portion 12B, the core bottom portion 12C, and the plunger 13 are magnetized by the magnetic field generated by the coil 11.

Here, the first and second core portions 12A and 12B are arranged with a gap, for example, and are bonded to each other by a resin collar 12D. That is, the collar 12D has a cylindrical shape as a whole, and the first core portion 12A and the second core portion are coupled in a positioned state. Further, the first and second core portions 12A and 12B are fixed to the cases 16A and 16B.

The core bottom 12C is provided with a recess 121 on the other side in the axial direction. Further, the core bottom portion 12C has a second hole 120 penetrating in the axial direction from the outside to the recess 121 on the ground side in the radial direction. The spacer 15 is closely fixed to the other surface of the core bottom portion 12C in the axial direction with the annular recess 121 as an annular gap. The spacer 15 covers the recess 121 from the inside of the solenoid device.

The spacer 15 is a non-magnetic material such as a polyester resin, an epoxy resin, or PTFE. If the spacer 15 is a non-magnetic material, the spacer 15 will not be magnetized by the magnetic field from the coil 11. Therefore, the movement of the plunger 13 is not restricted by the spacer 15.

The spacer 15 has a connecting portion 151 for connecting the recess 121 and the plunger chamber 132 on the side opposite to the second hole 120 with respect to the central axis 100, that is, on the top side in the radial direction. For example, as shown in FIG. 5, the connecting portion 151 of the spacer 15 is, for example, a connecting hole. If the connecting portion 151 is a connecting hole, symmetry with the second hole 120 is ensured. This symmetry has the effect of smoothing the breathing of the solenoid device.

However, the connecting portion 151 is not limited to the connecting hole as long as the recess 121 and the plunger chamber 132 are connected.

The spacer 15 has, for example, a ring shape. The spacer 15 preferably has a similar shape that covers the opening portion of the recess 121 in order to secure a breathing path from the ground side to the top side. The spacer 15 is, for example, fitted to the annular joining portion 152 provided on the inner surface of the first core portion 12A. The annular fitting portion 152 is, for example, a step or groove provided on the inner surface of the first core portion 12A.

The spacer 15 has, for example, a flat portion 153 on the outer side in the radial direction orthogonal to the axial direction, as shown in FIG. The flat portion 153 is an element for accurately aligning the spacer 15 when it is aligned with the first core portion 12A. For example, the flat portion 153 can accurately align the second hole 120 to the ground side and the connecting portion 151 to the top side. In this case, if the second hole 120 and the connecting portion 151 are in a positional relationship of 180 ° with respect to the central axis 100, the contamination is prevented from entering the plunger chamber 132 to the maximum extent.

Further, the flat portion 153 has an effect of fixing the spacer 15 to the first core portion 12A after the spacer 15 is fitted to the annular mating portion 152. That is, the spacer 15 does not rotate about the central axis 100. Therefore, for example, the positional relationship in which the second hole 120 is on the ground side and the connecting portion 151 is on the top side is always maintained even after the spacer 15 is set.

The first hole 131, the second hole 120, and the recess 121 are provided for breathing of the solenoid device. That is, the first hole 131, the second hole 120, and the recess 121 improve the responsiveness of the solenoid device.

The recess 121 is arranged around the central axis 100. The recess 121 has, for example, a ring shape. In this case, the breathing path includes a path from the second hole 120 through the left side of the recess 121 to reach the connection portion 151 and a path from the second hole 120 through the right side of the recess 121 to reach the connection portion 151. , And. Therefore, the breathing of the solenoid device is further facilitated and the responsiveness is further improved.

It is desirable that the first hole 131 is arranged on the same side as the second hole 120 with respect to the central axis 100. In this case, for example, the second hole 120 is arranged on the ground side, the connecting portion 151 is arranged on the top side, and the first hole 131 is arranged on the ground side. This means that the number of cranks as the breathing path of the solenoid device will increase. Therefore, even if the contamination invades the plunger chamber 132, the contamination is less likely to be diffused to the entire plunger chamber 132. That is, the reliability of the solenoid device is further improved.

Further, on the same side as the second hole 120 with respect to the central axis 100, that is, on the ground side, the gap between the core bottom portion 12C and the spacer 15, for example, the radial outer end of the recess 121 is the second. It is located outside the hole 120 in the radial direction. In this case, a so-called contamination pocket 122 is provided in a gap as a respiratory path, for example, in the recess 121. The contamination pocket 122 has an effect of accumulating contamination that has entered the solenoid device from the second hole 120.

For example, the contamination that has entered the recess 121 from the second hole 120 does not move to the connection portion 151 on the top side, but due to gravity, the end on the ground side, that is, the outer end in the radial direction of the recess 121. Accumulate in the part. At this time, if the contamination pocket 122 does not exist, the accumulated contamination moves to the top side again due to the flow of gas (for example, air) or liquid (for example, oil) from the second hole 120 to the recess 121. .. In some cases, a large amount of contamination diffuses in the recess 121, and a part of the contamination penetrates into the plunger chamber 132 via the connecting portion 151.

On the other hand, the contamination pocket 122 has a function of accumulating contamination at a position in the recess 121 away from the flow of gas or liquid. Therefore, the contamination accumulated in the contamination pocket 122 is diffused in the recess 121, and the situation of moving to the top side again does not occur. That is, the contamination pocket 122 effectively prevents the contamination from invading the plunger chamber 132 regardless of the amount of contamination invading.

The cases 16A and 16B surround the bobbin 10 and are coupled to the first and second core portions 12A and 12B. The cases 16A and 16B are magnetic materials such as iron, like the first and second core portions 12A and 12B. The cases 16A and 16B protect the internal elements of the solenoid device. Further, the cases 16A and 16B facilitate the handling of the solenoid device.

The cases 16A and 16B include a flange portion 161. The flange portion 161 contributes to facilitation of assembly, for example, when incorporating the solenoid device into the system. The seal member 101 is, for example, an O-ring. The sealing member 101 seals between the bobbin 10 and the cases 16A and 16B.

For example, when a solenoid device is applied to a valve system that controls oil pressure, oil enters the plunger chamber 132 via a breathing path. The oil has the effect of smoothing the movement of the plunger 13, but if this oil leaks from the joints of the cases 16A and 16B, it is not desirable for the entire system. The sealing member 101 is effective in preventing oil from leaking from the solenoid device.

The shaft pin 14 can move in the axial direction following the movement of the plunger 13. If the shaft pin 14 can move in the axial direction following the movement of the plunger 13, the output of the solenoid device can be easily taken out as the movement amount of the shaft pin 14. In this case, the solenoid device can be easily incorporated into a system such as a valve system.

The shaft pin 14 is a non-magnetic material such as stainless steel. The shaft pin 14 is inserted into the plunger 13 in the axial direction and fixed to the plunger 13, for example. If the plunger 13 and the shaft pin 14 are integrated, the movement of the plunger 13 and the movement of the shaft pin 14 can be perfectly matched.

One side of the shaft pin 14 in the axial direction is exposed from the cases 16A and 16B. Further, one side of the shaft pin 14 in the axial direction may be projectable from the cases 16A and 16B. For example, when the plunger 13 moves most to the other side in the axial direction, for example, as shown in FIG. 1, the shaft pin 14 fits inside the cases 16A and 16B. Further, when the plunger 13 moves most to one side in the axial direction, for example, as shown in FIG. 2, the shaft pin 14 protrudes from the cases 16A and 16B.

As described above, according to the first example of the solenoid device, the spacer 15 is arranged so as to secure a space for a recess on the other side of the core bottom 12C in the axial direction and cover the other side of the core bottom in the axial direction. Will be done. That is, a respiratory path is provided between the spacer 15 and the core bottom 12C. This breathing path has, for example, a structure in which the opening side of the recess 121 is closed by the spacer 15. Moreover, the core bottom 12C has a second hole 120 penetrating from the outside to the respiratory path on the ground side in the radial direction. Further, the spacer 15 has a connecting portion 151 on the top side in the radial direction.

Therefore, the outside of the solenoid device and the plunger chamber 132 are spatially connected to each other by a breathing path including a second hole 120, a recess 121, and a connecting portion 151. In addition, this breathing path has a crank shape. In this case, for example, the breathing of the solenoid device is ensured, the responsiveness is improved, and the invasion of contamination from the outside can be prevented. This is because the direction from the second hole 120 toward the connecting portion 151 is the direction against gravity, that is, the direction from the ground side to the top side. In this case, even if the contamination enters the recess 121 from the second hole 120, the contamination is difficult to reach the connecting portion 151 due to its own weight, and further, it does not enter the plunger chamber 132.

As described above, according to the first example of the solenoid device, the responsiveness of the solenoid device can be improved while preventing contamination from entering from the outside of the solenoid device.

Further, in the first example of the solenoid device, the above-mentioned effects can be obtained from the viewpoint of preventing contamination and responsiveness, and further, the following effects can be obtained due to its structure.

The recess 121, which is the breathing path of the solenoid device, faces the inside of the solenoid device, that is, the plunger chamber 132 side. This means that the spacer 15 is not exposed to the outside of the solenoid device. The spacer 15 is generally made of a non-magnetic material such as polyester resin, epoxy resin, or PTFE. These non-magnetic materials are thin and vulnerable to impact. Therefore, providing the spacer 15 inside the solenoid device is very effective for protecting the spacer 15 from impact and improving the reliability of the solenoid device.

<Second example of solenoid device>
FIG. 7 shows a second example of the solenoid device. FIG. 7 shows a state when the plunger is most moved to the other side in the axial direction.
The second example is a modification of the first example (FIGS. 1 to 6).
Therefore, in the second example, the same elements as those in the first example are designated by the same reference numerals, and detailed description thereof will be omitted.

The second example is characterized by the structure of the spacer 15 and the connection portion 151 as compared with the first example. For example, as shown in FIG. 8, the spacer 15 has a notch on the top side in the radial direction. This cutout portion functions as a connecting portion 151 after the spacer 15 is coupled to the first core portion 12A. In this case, the connecting portion 151 serves as a gap between the first core portion 12A and the spacer 15.

If the connecting portion 151 is a gap between the first core portion 12A and the spacer 15, the connecting portion 151 can be arranged on the most top side in the recess 121. In this case, since the distance from the second hole 120 to the connecting portion 151 is maximized, it becomes more difficult for contamination to enter the plunger chamber 132.

The spacer 15 may have a flat portion 153 on the outer side in the radial direction orthogonal to the axial direction, for example, as shown in FIG. As described in the first example, the flat portion 153 is an element for accurately aligning the spacer 15. Therefore, also in the second example, the positional relationship that the second hole 120 is on the ground side and the connecting portion 151 is on the top side is always maintained.

As described above, also in the second example, the responsiveness and reliability of the solenoid device can be improved.

<Third example of solenoid device>
FIG. 10 shows a third example of the solenoid device. FIG. 10 shows a state when the plunger is most moved to the other side in the axial direction.
The third example is also a modified example of the first example (FIGS. 1 to 6).
Therefore, in the third example, the same elements as those in the first example are designated by the same reference numerals, and detailed description thereof will be omitted.

The third example is characterized in the structure of the joint portion between the first core portion 12A and the spacer 15 as compared with the first example. For example, the first core portion 12A has an annular mating portion 152 to which the spacer 15 is mated. However, unlike the first example, the annular fitting portion 152 is an annular groove provided on the inner surface of the first core portion 12A.

In this case, the spacer 15 is fixed to the first core portion 12A by being fitted to the annular mating portion 152. Further, for example, as shown in FIG. 6, if the spacer 15 has the flat portion 153, the spacer 15 does not rotate about the central axis 100. Therefore, for example, the positional relationship in which the second hole 120 is on the ground side and the connecting portion 151 is on the top side is always maintained even after the spacer 15 is set.

As described above, also in the third example, the responsiveness and reliability of the solenoid device can be improved.

<Fourth example of solenoid device>
FIG. 11 shows a fourth example of the solenoid device. FIG. 11 shows a state when the plunger is most moved to the other side in the axial direction.
The fourth example is a modification of the third example (FIG. 10).
Therefore, in the fourth example, the same elements as those in the third example are designated by the same reference numerals, and detailed description thereof will be omitted.

The fourth example is characterized in that, as compared with the third example, the first core portion 12A and the spacer 15 are connected by a so-called snap-fit structure. For example, the spacer 15 has a hook portion. Further, the annular fitting portion 152 is a recess provided in the first core portion 12A, and has a catch portion to which the hook portion is fixed.

In this case, the spacer 15 is completely fixed to the first core portion 12A by being fitted to the annular mating portion 152. That is, the spacer 15 does not rotate about the central axis 100. Therefore, for example, the positional relationship in which the second hole 120 is on the ground side and the connecting portion 151 is on the top side is always maintained even after the spacer 15 is set.

As described above, also in the fourth example, the responsiveness and reliability of the solenoid device can be improved.

<Relationship between plunger and shaft pin>
In the first to fourth examples (FIGS. 1 to 11) of the solenoid device, the plunger 13 and the shaft pin 14 are integrated. In this case, the movement of the plunger 13 and the movement of the shaft pin 14 can be perfectly matched, and the responsiveness of the solenoid device can be further improved.

FIG. 12 shows an example of coupling between the plunger and the shaft pin.
When the plunger 13 and the shaft pin 14 are integrated, it is desirable that the plunger 13 and the shaft pin 14 are connected to each other by, for example, caulking. This is because caulking can combine the two easily and at low cost.

In this case, the plunger 13 has a shaft hole 141 penetrating in the axial direction. It is desirable that the shaft hole 141 is provided at the center of the plunger 13, that is, the shaft hole 141 is arranged around the central axis 100. Further, the plunger 13 has a painted surface portion 18. The painted surface portion 18 is a portion of the inner surface of the shaft hole 141 and the surface of the plunger 13 facing the axial direction except for the peripheral portion 19 surrounding the edge of the shaft hole 141, and is at least the outer side in the radial direction orthogonal to the axial direction. It is provided on the peripheral surface surface portion of the plunger 13 facing the surface.

Further, when the painted surface portion 18 is also provided on the axial end surface portion of the surface of the plunger 13 facing the axial direction except for the peripheral portion 19, the painted surface portion 18 is provided on the outer corner portion in the radial direction of the plunger 13. become. As described above, if the painted surface portion 18 is continuous at the corner portion, the situation where the painted surface portion 18 is peeled off from the corner portion can be avoided.

The coated surface portion 18 is a metal layer obtained by a coating technique such as plating coating. In this case, the painted surface portion 18 can be manufactured by a low-cost and simple method. However, the coated surface portion 18 may be provided by a coating technique such as powder coating or spray coating that sprays metal fine particles.

Further, the shaft pin 14 is provided with a recess in the circumferential direction surrounding the shaft pin 14. It is desirable that the recess of the shaft pin 14 is provided, for example, in the entire circumferential direction, that is, in the entire circumference of 360 °. Then, a part of the plunger 13 is crimped into the recess (caulked portion) of the shaft pin 14.

The caulking portion 133 can be formed by, for example, a punch 17. The punch 17 has a tapered tip. The tapered tip is used to deform a portion of the plunger 13 and secure the plunger 13 to the shaft pin 14. For example, as shown in the figure, the shaft pin 14 is inserted into the shaft hole SH of the plunger 13. In this state, the corners of the plunger 13 are positioned so as to correspond to the recesses of the shaft pins 14, and both are temporarily fixed. After that, by sliding the punch in the axial direction, the tapered tip of the punch 17 collides with the corner portion of the plunger 13.

As a result, the corner portion of the plunger 13 is fitted into the recess of the shaft pin 14, and the crimped portion 133 is formed.

At this time, the painted surface portion 18 does not exist in the peripheral portion 19 surrounding the edge of the shaft hole 141. This means that when the plunger 13 is fixed to the shaft pin 14, the painted surface portion 18 does not come off. In other words, the situation where the painted surface portion 18 becomes foreign matter, for example, metal powder and diffuses into the plunger chamber does not occur. Therefore, according to the structure in which the painted surface portion 18 is partially provided on the surface of the plunger 13 as in this example, the reliability of the solenoid device is improved.

<Coaxiality between plunger and shaft pin>
FIG. 13A shows an embodiment of the painted surface of the plunger.
First, as a premise, the plunger 13 has a shaft hole 141, and the shaft pin 14 is inserted into the shaft hole 141. The shaft pin 14 penetrates the plunger 13 in the axial direction.

When the shaft pin 14 penetrates the plunger 13 in the axial direction, for example, on the other side in the axial direction, the tip of the other side of the shaft pin 14 serves as a support, and the plunger 13 does not come into contact with, for example, the case 16B of FIG. .. This prevents the plunger 13 from being attracted to the case 16B when both the plunger 13 and the case 16B are magnetized.

Here, when the plunger 13 and the shaft pin 14 are integrated, in order to improve the responsiveness of the plunger 13 in the solenoid device, the coaxiality of the plunger 13 and the shaft pin 14, that is, the central axis coincides. High accuracy is desirable. However, for example, as shown in the comparative example of FIG. 13B, when the painted surface portion 18 is provided on the surface of the plunger 13, the painted surface portion 18 is generally also provided on the inner surface of the shaft hole 141.

In this case, considering the variation in the thickness W18 of the painted surface portion 18, the size Wh of the shaft hole 141 must be sufficiently larger than the size Wp of the shaft pin 14. For example, Wh must satisfy at least the relationship Wh> Wp + (2 × W18). This means increasing the clearance between the inner surface of the shaft hole 141 and the surface of the shaft pin 14. This clearance reduces the coaxiality between the plunger 13 and the shaft pin 14.

On the other hand, in the embodiment of FIG. 13A, the painted surface portion 18 is provided on the surface of the plunger facing outward in the radial direction at least orthogonal to the axial direction, and the inner surface of the shaft hole 141 and the plunger 13 facing in the axial direction. It is not provided on the peripheral portion 19 of the surface surrounding the edge of the shaft hole 141.

In this case, since it is not necessary to consider the variation in the thickness of the painted surface portion 18, the size Wh of the shaft hole 141 can be made closer to the size Wp of the shaft pin 14. For example, Wh may satisfy at least the relationship of Wh> Wp. This means that the clearance between the inner surface of the shaft hole 141 and the surface of the shaft pin 14 can be reduced. This clearance improves the coaxiality between the plunger 13 and the shaft pin 14. However, Wh and Wp are both radial sizes.

When the painted surface portion 18 is provided on a portion of the surface of the plunger 13 facing the axial direction other than the peripheral portion 19, the plunger 13 and the spacer 15'when the plunger 13 moves most to one side in the axial direction It is necessary to prevent the painted surface portion 18 from peeling off due to contact.

Therefore, for example, it is desirable that the radial size W19 of the peripheral portion 19 is larger than the radial size W15'of the spacer 15'. This is because, in this case, even if the plunger 13 moves most to one side in the axial direction, the painted surface portion 18 of the plunger 13 does not come into contact with the spacer 15', and the painted surface portion 18 does not peel off.

The spacer 15'corresponds to, for example, a portion of the spacer 15 in FIG. 1 that protrudes in the axial direction at the position closest to the central axis 100, and guides the axial movement of the shaft pin 14. Further, the spacer 15'may be provided independently of the spacer 15 shown in FIG. 1, for example.

<Application example>
The solenoid device described above can be applied to various systems such as a pressure control system. For example, in the field of automobiles, oil pressure is required to drive an automatic transmission (AT, CVT, etc.). In addition, it is necessary to generate flood control for lubrication and cooling of drive parts such as engines and transmissions. These oils are generated by the solenoid valve, and the solenoid device is used as part of the solenoid valve.

Hereinafter, some examples of valve systems to which the above-mentioned solenoid device can be applied will be described.

<First example of valve system>
FIG. 14 shows a first example of a valve system.
The first example relates to solenoid valves such as VFS.

The valve system includes a solenoid device 20 and a valve device 30. The solenoid device 20 is, for example, the solenoid device described with reference to FIGS. 1 to 13. The valve device 30 includes a spool 31 that is coupled to the solenoid device 20 and can move in the axial direction, and controls the opening and closing of the valves 32A, 32B, 32C, 32D, and 32E by the amount of movement of the spool 31.

The valves 32A, 32B, 32C, 32D, 32E include an input port 32A to which an input pressure (hydraulic) is input, an output port 32B to which an output pressure (hydraulic) is output, and a feedback port 32C to which a feedback pressure is input. A drain port 32D for discharging excess oil in the valve device 30 and an oil supply port 32E for supplying oil for lubrication in the solenoid device 20 are provided.

The relationship between the input pressure and the output pressure changes depending on the position of the spool 31. That is, when the input pressure is a constant pressure, for example, when the oil pressure is supplied from the oil pump, the output pressure is arbitrary depending on the position of the spool 31 with a lower pressure or a higher pressure based on the input pressure. Can be generated in.

The feedback pressure is, for example, a feedback of the output pressure and is equivalent to the output pressure. The reason why the feedback pressure is input to the feedback port 32C is to prevent fluctuations in the output pressure, that is, oil vibration.

The valve device 30 further includes an urging member (eg, a spring) 33 that urges the spool 31 to the other side in the axial direction.

For example, when the solenoid device 20 is in the initial state (non-operating state), that is, when no current is flowing through the solenoid coil, the urging force of the urging member 33 causes the spool 31 and the shaft pin 14 to move to the other side in the axial direction. Bounce.

This state is shown in the upper half of the figure. As is clear from the upper half of the figure, when the solenoid device 20 is in the initial state, the input port 32A and the output port 32B are separated from each other by the wall of the spool 31. Further, the excess oil in the valve device 30 is discharged from the drain port 32D.

On the other hand, for example, when the solenoid device 20 is in an operating state, that is, when a current is flowing through the solenoid coil, the magnetic field generated by the solenoid coil moves the plunger, that is, the shaft pin 14 to one side in the axial direction. Generate a moving force to make it. Therefore, if this moving force is larger than the urging force of the urging member 33, the shaft pin 14 moves to one side in the axial direction. Further, the spool 31 also follows the movement of the shaft pin 14 and moves to one side in the axial direction.

This state is shown in the lower half of the figure. As is clear from the lower half of the figure, when the solenoid device 20 is in the operating state, the input port 32A and the output port 32B are connected to each other via the groove of the spool 31. Further, the oil is supplied to the solenoid device 20 via the oil supply port 32E.

Here, as described above, in the solenoid device 20, the second hole 120 is arranged on the ground side with respect to the central axis 100, and the connecting portion 151 is arranged on the top side with respect to the central axis 100. In the state, it is coupled to the valve device 30. Therefore, in such a valve system, even if the oil supplied from the oil supply port 32E into the solenoid device 20 contains contamination, the contamination does not enter the plunger chamber of the solenoid device 20.

As described above, according to the first example of the valve system, the responsiveness of opening and closing the valve is improved, and contamination can be effectively prevented from entering the solenoid device from the valve device.

<Second example of valve system>
FIG. 15 shows a second example of a valve system.
A second example relates to a control valve that controls a transmission.

The valve system includes a transmission 40, a control valve main body 41 that generates hydraulic pressure to control the transmission 40, an oil pump 42 that supplies oil of a predetermined hydraulic pressure to the control valve main body 41, and an oil pan that stores oil. 43 and.

The solenoid valve is attached to the control valve body 41. The solenoid valve generates the oil pressure that controls the transmission 40 based on the oil pressure from the oil pump 42. The solenoid valve is, for example, the solenoid valve of FIG. 14, and includes a solenoid device 20 and a valve device 30.

In such a valve system, multiple oil pressures must be precisely controlled and at the same time the valve system must be adequately protected from contamination (metal powder, oxidative alterations, dust, etc.) contained in the oil. ..

In this example, as described above, the solenoid device 20 has a structure in which contamination does not easily enter the plunger chamber (see FIG. 14). Therefore, according to the valve system of this example, it is possible to accurately control a plurality of flood pressures while preventing contamination in the oil from entering the plunger chamber. That is, since the solenoid device can sufficiently breathe, the responsiveness of opening and closing the valve in the valve system is improved. This means that multiple oil pressures are generated accurately and at high speed.

As described above, according to the second example of the valve system, the responsiveness of opening and closing the valve is improved, and contamination can be effectively prevented from entering the solenoid device from the valve device.

<Third example of valve system>
FIG. 16 shows a third example of a valve system.
A third example relates to a valve system in which a solenoid device can be attached to a valve body that controls liquid or gaseous pressure, eg, oil pressure.

The valve system includes a solenoid device 20 and a valve body 50. The solenoid device 20 is, for example, the solenoid device described with reference to FIGS. 1 to 13. The solenoid device 20 is fixed to the valve body 50 by, for example, a screw 162. The screw 162 is attached to, for example, the flange portion 161 of the solenoid device 20.

The valve body 50 includes a spool 51 that can move in the axial direction, and controls the opening and closing of the valves 52A, 52B, 52C, 52D, and 52E by the amount of movement of the spool 51.

The valves 52A, 52B, 52C, 52D, 52E include an input port 52A to which an input pressure (hydraulic) is input, an output port 52B to which an output pressure (hydraulic) is output, and a feedback port 52C to which a feedback pressure is input. A drain port 52D for discharging excess oil in the valve body 50 and an oil supply port 52E for supplying oil for lubrication in the solenoid device 20 are provided.

The relationship between the input pressure and the output pressure changes depending on the position of the spool 51. That is, when the input pressure is a constant pressure, for example, when the oil pressure is supplied from the oil pump, the output pressure is arbitrarily lower or higher than the input pressure depending on the position of the spool 51. Can be generated in.

The feedback pressure is, for example, a feedback of the output pressure and is equivalent to the output pressure. The reason why the feedback pressure is input to the feedback port 52C is to prevent fluctuations in the output pressure, that is, oil vibration.

The valve body 50 further includes an urging member (eg, a spring) 53 that urges the spool 51 to the other side in the axial direction.

For example, when the solenoid device 20 is in the initial state (non-operating state), that is, when no current is flowing through the solenoid coil, the urging force of the urging member 53 causes the spool 51 and the shaft pin 14 to move to the other side in the axial direction. Bounce.

This state is shown in the upper half of the figure. As is clear from the upper half of the figure, when the solenoid device 20 is in the initial state, the input port 52A and the output port 52B are separated from each other by the wall of the spool 51. Further, the excess oil in the valve body 50 is discharged from the drain port 52D.

On the other hand, for example, when the solenoid device 20 is in an operating state, that is, when a current is flowing through the solenoid coil, the magnetic field generated by the solenoid coil moves the plunger, that is, the shaft pin 14 to one side in the axial direction. Generate a moving force to make it. Therefore, if this moving force is larger than the urging force of the urging member 53, the shaft pin 14 moves to one side in the axial direction. Further, the spool 51 also follows the movement of the shaft pin 14 and moves to one side in the axial direction.

This state is shown in the lower half of the figure. As is clear from the lower half of the figure, when the solenoid device 20 is in the operating state, the input port 52A and the output port 52B are connected to each other via the groove of the spool 51. Further, the oil is supplied to the solenoid device 20 via the oil supply port 52E.

Here, as described above, in the solenoid device 20, the second hole 120 is arranged on the ground side with respect to the central axis 100, and the connecting portion 151 is arranged on the top side with respect to the central axis 100. In the state, it is coupled to the valve body 50. Therefore, in such a valve system, even if the oil supplied from the oil supply port 52E into the solenoid device 20 contains contamination, the contamination does not enter the plunger chamber of the solenoid device 20.

As described above, according to the third example of the valve system, the responsiveness of opening and closing the valve is improved, and contamination can be effectively prevented from entering the solenoid device from the valve device.

<Conclusion>
As described above, according to the embodiment of the present invention, the responsiveness and reliability of the solenoid device can be improved.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various forms other than those described above, and various omissions, substitutions, changes, etc. can be made without departing from the gist of the present invention. These embodiments and modifications thereof are included in the scope and gist of the present invention, and the inventions described in the claims and their equivalents are also included in the scope and gist of the present invention.

10: Bobbin, 11: Coil, 12A: 1st core part, 12B: 2nd core part, 12C: Core bottom, 13: Plunger, 14: Shaft pin, 15: Spacer, 16A, 16B: Case, 100: Central axis, 101: Sealing member, 120: Second hole, 121: Recess, 122: Contamination pocket, 131: First hole, 132: Plunger chamber, 151: Connection part, 152: Circular joint part, 161: Flange part.

Claims (11)

With the case
A bobbin having a first cylindrical portion supported in the case and having a first central shaft hole along the axial direction.
A coil wound around the first cylindrical portion and
A core having a second cylindrical portion arranged in the first central shaft hole and having a second central shaft hole along the axial direction.
A plunger made of a magnetic material, arranged in the space inside the second cylindrical portion, having a shaft hole extending in the axial direction, and movable in the axial direction with respect to the second cylindrical portion.
The shaft pin inserted into the shaft hole and
With
The plunger has a painted surface portion whose surface is coated.
The painted surface portion includes the inner surface of the shaft hole, the portion of the axial end surface of the plunger facing the axial direction excluding the peripheral portion surrounding the edge of the shaft hole, and the outer side in the radial direction orthogonal to the axial direction. a circumferential portion of the plunger which faces provided al is in,
Further provided with spacers that are supported by the case, guide the movement of the shaft pin, and are arranged on one side in the axial direction with respect to the plunger.
The radial size of the peripheral portion is larger than the radial size of the spacer.
Solenoid device. The painted surface is made of metal.
The solenoid device according to claim 1. The shaft pin penetrates the plunger in the axial direction and
The first protrusion on which the shaft pin protrudes from the plunger on one side in the axial direction is longer than the second protrusion on which the shaft pin protrudes from the plunger on the other side in the axial direction.
The solenoid device according to any one of claims 1 and 2. The shaft pin has a crimped portion in the circumferential direction surrounding the shaft pin.
The plunger includes a crimped portion that is pressed against the crimped portion.
The crimped portion is located at a peripheral portion surrounding the edge of the shaft hole.
The solenoid device according to any one of claims 1 to 3. The solenoid device according to any one of claims 1 to 4 , wherein the plunger has a breathing hole that penetrates the plunger in the axial direction at a position deviated from the central axis. The core and the case are both made of magnetic material.
The solenoid device according to any one of claims 1 to 5. The second cylindrical portion includes a first portion arranged on one side in the axial direction and a second portion arranged on the other side in the axial direction.
The first and second portions are separated from each other via an air gap.
The solenoid device according to any one of claims 1 to 6. The solenoid device according to any one of claims 1 to 7.
A valve body having a valve device to which the solenoid device is coupled and the valve is driven by the shaft pin of the solenoid device.
To prepare
Control valve. The valve device includes a spool that moves in the axial direction by the shaft pin of the solenoid device, and the valve is driven by the amount of movement of the spool.
The control valve according to claim 8. The shaft pin of the solenoid device comes into contact with the spool.
The movement of the spool follows the movement of the plunger.
The control valve according to claim 9. The valve device controls the oil pressure.
Control valve according to claim 1 0.

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