JP7031165B2 - 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, when the plunger receives a magnetic field from the solenoid coil, it is magnetized and moves in the axial direction.

Solenoid devices can be applied to various systems. For example, in the field of automobiles, hydraulic pressure is required to drive an automatic transmission (AT, CVT, etc.). In addition, it is necessary to generate hydraulic pressure for lubrication and cooling of drive parts such as engines and transmissions. These hydraulic pressures are generated by a solenoid valve such as VFS (variable force electric), 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 room) in which the plunger can move to the outside of the solenoid device. This is because the air in and out of the plunger chamber (hereinafter, the air in and out 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.

However, if the axial end of the plunger is in contact with the case when a current is passed through the coil to generate a magnetic field, both are magnetically adsorbed due to the influence of the residual magnetism of the plunger and the case, and the responsiveness becomes high. The problem of getting worse arises. On the other hand, a solenoid device is configured in which a spacer is provided between the axial end of the plunger and the case to secure a gap between the axial end of the plunger and the case when the plunger is moved by a magnetic field. Is also possible.

However, when a spacer is provided between the axial end of the plunger and the case, a step of attaching and fixing the spacer to the case is required. In this process, a spacer mounting error may occur, which may increase the number of parts, increase the mounting work process, or reduce the reliability of the solenoid device.

Patent Document 1 discloses a structure in which a spacer is provided between an axial end portion of a plunger and a case.

Japanese Unexamined Patent Publication No. 2005-277289

In the solenoid device disclosed in Patent Document 1, a spacer is provided between the axial end of the plunger and the case. Therefore, as the number of parts increases, the spacer mounting error may occur in the process of mounting the spacer on the case, and the reliability of the solenoid device is lowered.

The present invention proposes a structure capable of suppressing magnetic adsorption between the plunger and the case without providing a spacer between the plunger and the case.

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 coil wound around a first cylindrical portion, a second cylindrical portion arranged in the first central shaft hole and provided with a second central shaft hole along the axial direction, and one side in the axial direction. A core having a core bottom portion covering the second central shaft hole, and a magnetic material, which is arranged in a plunger chamber in a space inside the second cylindrical portion and has a shaft hole extending in the axial direction. A plunger that is axially movable with respect to the second cylindrical portion and a plunger that is inserted into the shaft hole, one side in the axial direction is exposed from the case, and the other side in the axial direction is covered by the case. It comprises a shaft pin and a spacer fixed to the other side surface of the core bottom in the axial direction . The case has a recess facing the surface of the plunger facing the other side in the axial direction. The plunger has a breathing hole that penetrates the plunger axially, the other side of the breathing hole is connected to the recess, and the bottom of the core is covered with the spacer and recessed to the other side in the axial direction. It has a recess and a second hole axially penetrating from the outside to the recess in a region on one side of the plane including the central axis, the spacer having a connecting portion that penetrates axially and is connected to the recess. The breathing hole and the connection portion are connected to the plunger chamber. The breathing hole and the second hole are located in the one side region, and the connection portion is located in the other side region of the plane including the central axis.

According to the first exemplary invention of the present application, magnetic adsorption between the plunger and the case can be suppressed without providing a spacer between the plunger and the case.

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 cross-sectional view showing a fifth example of the solenoid device. FIG. 13 is a diagram showing an example of coupling between the plunger and the shaft pin. FIG. 14A is a diagram showing the relationship between the application time of the magnetic field and the position of the plunger in the embodiment. FIG. 14B is a diagram showing the relationship between the application time of the magnetic field and the position of the plunger in the comparative example. FIG. 15 is a diagram showing a first example of a valve system. FIG. 16 is a diagram showing a second example of a valve system. FIG. 17 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, shapes, numbers, 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 range 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 opposite direction. Further, the ground side corresponds to the region on one side of the plane including the central axis, and the heaven side corresponds to the region on the other side of the plane including the central axis.

<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 12B are coupled in a positioned state. Further, the first and second core portions 12A and 12B are fixed to the cases 16A and 16B.

However, the cases 16A and 16B are magnetic materials such as iron, like the first and second core portions 12A and 12B. This is because the cases 16A and 16B function as a path for the magnetic field generated by the coil 11. In this case, when the coil 11 generates a magnetic field, the plunger 13 and the cases 16A and 16B are magnetized at the same time. That is, at this time, the plunger 13 generates a magnetic attraction force that is attracted to the case 16B.

Therefore, a recessed portion 133 is provided on the inner surface of the case 16B facing the surface on the other side in the axial direction of the plunger 13. The recessed portion 133 is arranged in a ring shape so as to surround the shaft pin 14, for example. Further, the case 16B has a convex portion 134 facing the other end surface of the shaft pin 14 in the axial direction in the recessed portion 133. The radial size of the protrusion 134 is smaller than the radial size of the end face on the other side of the shaft pin 14 in the axial direction.

In this case, when the plunger 13 moves to the farthest side in the axial direction, the end face on the other side in the axial direction of the shaft pin 14 comes into contact with the convex portion 134. That is, since the convex portion 134 of the case 16B supports the shaft pin 14, the area where the axial end face of the plunger 13 is close to the case 16B even when the plunger 13 moves to the farthest side in the axial direction (see FIG. 1). Can be reduced. Therefore, when a current is passed through the coil to generate a magnetic field, the plunger 13 is not magnetically attracted to the case 16B.

Further, the magnetic adsorption between the plunger 13 and the case 16B can be suppressed without shortening the axial length of the peripheral surface of the plunger 13. That is, since the area of the side surface (diametrical surface) of the plunger 13 is not affected by the recessed portion 133, the magnetic field from the first and second core portions 12A and 12B, which are the paths of the magnetic field, to the side surface of the plunger 13. The delivery area can be sufficiently secured.

Therefore, the solenoid device of this example has improved responsiveness from the two viewpoints of magnetic adsorption and magnetic field transfer. Moreover, since the peripheral surface length of the plunger 13 is not shortened, there is no inclination of the plunger 13 with respect to the central axis 100, and the hysteresis generated in the relationship between the time after the current is passed through the coil 11 and the position of the plunger is sufficient. Becomes smaller. This will be described later (see FIG. 14A).

From the viewpoint of suppressing magnetic attraction of the plunger 13 with the case 16B, it is desirable that the radial size of the recess 133 is the same as or larger than the radial size of the plunger 13.

Further, 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. Further, 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.

The core bottom portion 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 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 connection portion 151 of the spacer 15 is, for example, a connection 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 connection portion 151 is not limited to the connection hole as long as the recess 121 and the plunger chamber 132 are connected.

The spacer 15 has, for example, a ring shape. It is desirable that the spacer 15 has a similar shape to cover 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 mating portion 152 provided on the inner surface of the first core portion 12A. The annular mating 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 be accurately aligned with the second hole 120 on the ground side and the connecting portion 151 on 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 coupled 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 is 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 contaminants invade the plunger chamber 132, the contaminants are 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 on the outer side in the radial direction from the hole 120. In this case, a so-called contamination pocket 122 is provided in a gap as a breathing path, for example, in the recess 121. The contamination pocket 122 has the 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 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 connection 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, there is no possibility that the contamination accumulated in the contamination pocket 122 is diffused in the recess 121 and moves to the top side again. That is, the contamination pocket 122 effectively prevents the contamination from invading the plunger chamber 132 regardless of the amount of contamination invading.

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, for example, inserted into the plunger 13 in the axial direction and fixed to the plunger 13. 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 able to project 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 secures a recessed space on the other side of the core bottom portion 12C in the axial direction and covers the other side of the core bottom portion in the axial direction. Be placed. That is, a breathing 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 portion 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 is crank-shaped. 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 connection portion 151 is the direction against gravity, that is, the direction from the ground side to the heaven side. In this case, even if the contamination enters the recess 121 from the second hole 120, the contamination is difficult to reach the connection 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 the intrusion of contamination from the outside of the solenoid device.

Further, in the first example of the solenoid device, the above-mentioned effect can be obtained from the viewpoint of prevention of contamination and responsiveness, and further, the following effect 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.

Further, according to the first example of the solenoid device, the case 16B has a recess 133 facing the surface of the plunger 13 facing the other side in the axial direction. The recessed portion 133 has an effect of reducing the area where the axial end face of the plunger 13 is close to the case 16B even when the plunger 13 moves to the farthest side in the axial direction. Further, since it is not necessary to shorten the axial length of the peripheral surface of the plunger 13, the magnetic field can be smoothly transferred from the first and second core portions 12A and 12B, which are the paths of the magnetic field, to the side surface of the plunger 13. Will be done.

Therefore, the solenoid device of this example has improved responsiveness from the two viewpoints of magnetic adsorption and magnetic field transfer. Moreover, since the peripheral surface length of the plunger 13 is not shortened, there is no inclination of the plunger 13 with respect to the central axis 100, and the hysteresis generated in the relationship between the time after the current is passed through the coil 11 and the position of the plunger is sufficient. Becomes smaller.

<Second example of solenoid device>
FIG. 7 shows a second example of a 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 radial top side. 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 becomes 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 connection 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 modification 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 mating 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, even 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 a 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 the first core portion 12A and the spacer 15 are connected by a so-called snap-fit structure as compared with the third example. For example, the spacer 15 has a hook portion. Further, the annular mating 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.

<Fifth example of solenoid device>
FIG. 12 shows a fifth example of a solenoid device. FIG. 12 shows the state when the plunger is most moved to the other side in the axial direction.
The fifth example is a modification of the first example (FIG. 1).
Therefore, in the fifth 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 fifth example is characterized in that, as compared with the first example, there is no convex portion in the vicinity of the central axis 100 in the recessed portion 133 of the case 16B. For example, the recessed portion 133 of the case 16B is a circular recessed portion centered on the central axis 100.

In this case, the shaft pin 14 includes a protrusion 145 protruding from the plunger 13 to the other side in the axial direction. The protrusion 145 comes into contact with the case 16B when the plunger 13 moves to the farthest side in the axial direction. That is, the shaft pin 14 functions as a stopper. Therefore, it is desirable that the axial length of the protrusion 145 is equal to or slightly larger than the axial depth of the recess 133. This is because when the plunger 13 moves to the farthest side in the axial direction, the axial end portion of the second core portion 12B and the axial end portion of the plunger 13 coincide with each other, and the magnetic transfer area between the two is increased. This is because a certain gap can be secured between the plunger 13 and the case 16B.

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

<Relationship between plunger and shaft pin>
In the first to fifth examples (FIGS. 1 to 12) 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 completely matched, and the responsiveness of the solenoid device can be further improved.

FIG. 13 shows an example of the 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 shaft pin 14 is provided with a concave portion 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 caulked into the recess (caulked portion) of the shaft pin 14.

The caulking portion 1331 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 141 of the plunger 13. In this state, the corner portion of the plunger 13 is positioned so as to correspond to the concave portion of the shaft pin 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 caulked portion 1331 is formed.

<Improvement of hysteresis>
FIG. 14A shows the relationship between the application time of the magnetic field and the position (stroke) of the plunger in the embodiment. FIG. 14B shows the relationship between the application time of the magnetic field and the position (stroke) of the plunger in the comparative example.

Here, the embodiment is the solenoid device described in the first to fifth examples (FIGS. 1 to 12). Further, the comparative example is a solenoid device having no recessed portion 133 in the first to fifth examples (FIGS. 1 to 12). Further, L0 is a position when the plunger 13 moves to the farthest side in the axial direction in the plunger chamber. L1 is a position when the plunger 13 moves to the most one side in the axial direction in the plunger chamber.

In both the examples and the comparative examples, the position of the plunger 13 does not change in tdelay and tdelay'for a certain period after the coil 11 generates the magnetic field. However, the tdelay in the examples is shorter than the tdelay'in the comparative examples. This is because, as described above, in the examples, the magnetic attraction force received from the case 16B by the plunger 13 is smaller than that in the comparative example.

Therefore, in the embodiment, the total time t01 in which the plunger 13 moves from the other side L0 in the axial direction to the one side L1 in the axial direction is the total time t01 in which the plunger 13 moves from the other side L0 in the axial direction to one side in the axial direction in the comparative example. It is shorter than the total time t01'to move to L1. This means that the responsiveness of the solenoid device according to the embodiment is superior to the responsiveness of the solenoid device according to the comparative example.

In the embodiment, the time t10 for the plunger 13 to move from one side L1 in the axial direction to the other side L0 in the axial direction is the time t10 in which the plunger 13 moves from one side L1 in the axial direction to the other side L0 in the axial direction in the comparative example. It is the same as the moving time t10'. This is because the magnetic attraction force between the plunger 13 and the case 16B does not matter for the movement from one side L1 in the axial direction to L0 on the other side in the axial direction.

As a result, the hysteresis in the examples, that is, the relationship between the magnetic field application time and the position of the plunger (FIG. 14A) is the hysteresis in the comparative example, that is, the relationship between the magnetic field application time and the position of the plunger (FIG. 14B). Compared to, it is improved.

<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, hydraulic pressure is required to drive an automatic transmission (AT, CVT, etc.). In addition, it is necessary to generate hydraulic pressure for lubrication and cooling of drive parts such as engines and transmissions. These hydraulic pressures 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 solenoid device can be applied will be described.

<First example of valve system>
FIG. 15 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 is coupled to the solenoid device 20 and includes a spool 31 that 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 have an input port 32A to which an input pressure (hydraulic pressure) is input, an output port 32B to which an output pressure (hydraulic pressure) is output, and a feedback port 32C to which a feedback pressure is input. A drain port 32D for draining 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 hydraulic 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. Encourage.

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. 16 shows a second example of a valve system.
The 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 main body 41. The solenoid valve generates a hydraulic pressure that controls the transmission 40 based on the hydraulic pressure from the oil pump 42. The solenoid valve is, for example, the solenoid valve of FIG. 15, 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. 15). Therefore, according to the valve system of this example, it is possible to accurately control a plurality of hydraulic 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 hydraulic 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. 17 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 hydraulic 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 have an input port 52A to which an input pressure (hydraulic pressure) is input, an output port 52B to which an output pressure (hydraulic pressure) is output, and a feedback port 52C to which a feedback pressure is input. , A drain port 52D for draining excess oil in the valve body 50, and an oil supply port 52E for supplying oil for lubrication in the solenoid device 20.

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 hydraulic pressure is supplied from the oil pump, the output pressure is arbitrary depending on the position of the spool 51 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 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. Encourage.

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, magnetic adsorption between the plunger and the case can be suppressed without providing a spacer between the plunger and the case.

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 carried out 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 variations 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 mating part, 161: Flange part.

Claims (12)

With the case
A bobbin that is supported within the case and has a first cylindrical portion with a first central shaft hole along the axial direction.
The coil wound around the first cylindrical portion and
A second cylindrical portion arranged in the first central shaft hole and provided with a second central shaft hole along the axial direction , and a core bottom portion covering the second central shaft hole on one side in the axial direction. With a core that has
It is made of a magnetic material, is arranged in a plunger chamber 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. Plunger and
A shaft pin that is inserted into the shaft hole, one side in the axial direction is exposed from the case, and the other side in the axial direction is covered by the case.
With a spacer fixed to the other side surface of the core bottom in the axial direction .
The case has a recess facing the surface of the plunger facing the other side in the axial direction.
The plunger has a breathing hole that axially penetrates the plunger.
The other side of the breathing hole is connected to the recess and
The core bottom has a recess covered by the spacer and recessed on the other side in the axial direction, and a second hole axially penetrating from the outside to the recess in a region on one side of the plane including the central axis. ,
The spacer has a connection portion that penetrates in the axial direction and is connected to the recess.
The breathing hole and the connection portion are connected to the plunger chamber, and the connection portion is connected to the plunger chamber.
The breathing hole and the second hole are located in the one-sided area.
The connection is located in the area on the other side of the plane containing the central axis.
Solenoid device. The case has a convex portion in the recess portion facing the other end surface of the shaft pin in the axial direction.
The end face on the other side in the axial direction of the shaft pin is in contact with the convex portion.
The solenoid device according to claim 1. The radial size of the convex portion orthogonal to the axial direction is smaller than the radial size of the end face on the other side of the shaft pin in the axial direction.
The solenoid device according to claim 2. The radial size of the recess is larger than the radial size of the plunger.
The solenoid device according to any one of claims 1 to 3. The shaft pin comprises a protrusion protruding axially from the plunger to the other side.
The axial length of the protrusion is equal to or greater than the axial depth of the recess.
The solenoid device according to any one of claims 1 to 4. 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 caulked portion is located in a peripheral portion surrounding the edge of the shaft hole.
The solenoid device according to any one of claims 1 to 5. The core and the case are both made of a magnetic material.
The solenoid device according to any one of claims 1 to 6. The second cylindrical portion comprises a first portion disposed on one side in the axial direction and a second portion disposed on the other side in the axial direction.
The first and second portions are separated from each other with a gap.
The solenoid device according to any one of claims 1 to 7. The solenoid device according to any one of claims 1 to 8.
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 9. The shaft pin of the solenoid device contacts the spool and
The movement of the spool follows the movement of the plunger.
The control valve according to claim 10. The valve device controls hydraulic pressure.
The control valve according to claim 11.

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