JP2019029548A - Solenoid device and control valve - Google Patents

Abstract

To improve responsiveness and reliability of a solenoid device.SOLUTION: A solenoid device comprises a bobbin (10) surrounding a center shaft (100), a coil (11) wound around the bobbin (10), cores (12A, 12B, 12C) having cylinder parts (12A, 12B) surrounding the center shaft (100) inside the bobbin (10), a plunger (13) that are arranged in a space inside the cores (12A, 12B, 12C), has a shaft hole extending in an axial direction, can move in the axial direction and is made of a magnetic body, and a shaft pin (14) inserted in the shaft hole. The plunger (13) has a coating face. The coating face is provided at a portion except for a peripheral part surrounding an edge of the shaft hole, among the inner face of the shaft hole, and the surface of the plunger (13) directed in the axial direction.SELECTED DRAWING: Figure 1

Description

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

  The solenoid device is a device that drives a plunger, which is a magnetic body, using a solenoid coil. For example, a solenoid coil generates a magnetic field based on an input current. The plunger is movable in the axial direction described later. Therefore, when the plunger receives a magnetic field from the solenoid coil, it is magnetized and moves in the axial direction.

  The solenoid device can be applied to various systems. For example, in the automobile field, 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 driving parts such as engines and transmissions. These hydraulic pressures are generated by a solenoid valve such as a variable force solenoid (VFS), and the solenoid device is used as a part of the solenoid valve.

  In the solenoid device, it is desirable that the time from when an electric current is applied to the solenoid coil to when the plunger moves to a predetermined position is short, that is, the responsiveness is good. For this purpose, it is effective to spatially connect the internal space (plunger chamber) in which the plunger can move with the outside of the solenoid device. This is because air in and out of the plunger chamber (hereinafter referred to as breathing) is facilitated, and the air in the plunger chamber is not compressed or expanded by 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 coating surface portion by plating or the like, the surface of the plunger becomes a smooth surface with little 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 contact the periphery of the shaft hole. In general, the plunger and the shaft pin are 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.

  Further, the plunger reciprocates in the axial direction in the plunger chamber repeatedly at a high speed many times. At this time, the plunger may come into contact with a member in the solenoid device such as a spacer, and the painted surface may be peeled off. As described above, the painted surface part peeled off during the operation of the solenoid device diffuses into the plunger chamber as foreign matter, for example, metal powder. Such a foreign substance enters a gap in the plunger chamber, slows the movement of the plunger, and sometimes makes the plunger unmovable, causing a malfunction of the solenoid device.

  Patent document 1 discloses that the surface of a plunger is coat | covered with a coating surface part. Patent Document 1 discloses a technique in which the surface of the plunger is covered with a nonmagnetic cylinder instead of the painted surface.

JP 2009-147075 A

  In Patent Document 1, the painted surface portion is replaced with a nonmagnetic cylinder for the purpose of improving productivity. Therefore, in patent document 1, the subject that the coating surface part which covers a plunger becomes easy to peel in the structure where a plunger and a shaft pin are integrated does not generate | occur | produce. 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 a 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.

  A solenoid device according to an exemplary first 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 an axial direction, A coil wound around the first cylindrical portion, a core having a second cylindrical portion disposed in the first central axis hole and having a second central axis hole along the axial direction, and a magnetic body A plunger that is disposed in a 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 A shaft pin inserted into the hole. The plunger has a painted surface part whose surface is coated. The painted surface portion includes an inner surface of the shaft hole and a portion excluding a peripheral portion surrounding an edge of the shaft hole in an axial end surface of the plunger facing the axial direction, and a radially outer side perpendicular to the axial direction. And the peripheral surface portion of the plunger facing.

  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 as 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 illustrating 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 illustrating 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 illustrating an example of the coupling between the plunger and the shaft pin. FIG. 13A is a cross-sectional view showing an example of a painted surface of a plunger. FIG. 13B is a cross-sectional view showing a comparative example of the painted surface of the plunger. FIG. 14 is a diagram illustrating a first example of a valve system. FIG. 15 is a diagram illustrating a second example of the valve system. FIG. 16 is a diagram illustrating a third example of the valve system.

Hereinafter, embodiments will be described with reference to the drawings.
In the embodiment, in order to make the description easy to understand, the structure other than the main part of the present invention will be described in a simplified manner. In the drawings, the dimensions, shapes, numbers, etc. of the elements are also examples, and are not intended to be limited thereto.

  In the following description, the axial direction means a direction in which the central axis extends, and the radial direction means a direction orthogonal to the central axis. The axial direction refers to a direction parallel to the central axis, that is, a direction of 0 ° with respect to the central axis, and a range larger than 0 ° and smaller than 45 ° with respect to the central axis. Including the oblique 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.

  Furthermore, the ground side means the ground side, and the top side means the sky side. For example, when the direction of the earth's gravity is used as a reference, the ground side is preferably in the range of −45 ° to + 45 ° with respect to the direction of the earth's gravity, and the top side is the direction of the earth's gravity. The direction is preferably in the range of −45 ° to + 45 ° with respect to the opposite direction.

<First Example of Solenoid Device>
1 to 4 show a first example of a solenoid device. FIG. 1 shows a state where the plunger has moved most to the other side in the axial direction. FIG. 2 shows a state where the plunger has moved most 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 as viewed from one side in the axial direction.

  The bobbin 10 has a cylindrical shape surrounding the central axis 100, for example. 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 having a first central shaft hole along the axial direction. The coil (for example, solenoid coil) 11 is wound around the first cylindrical portion of the bobbin 10. The coil 11 is, for example, an enameled wire, a polyurethane wire, a polyester wire, etc., in which a copper wire is covered with a resin.

  The first core portion 12 </ b> A and the second core portion 12 </ b> B each have a cylindrical shape as a whole, and are disposed in the first central axis hole of the bobbin 10. 1st and 2nd core part 12A, 12B is provided with the 2nd center axis hole along an axial direction as a 2nd cylindrical part. 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 disposed in a plunger chamber 132 constituted by the second central shaft holes of the first and second core portions 12A and 12B. 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 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 disposed with a gap, for example, and are coupled to each other by a resin collar 12D. That is, the collar 12D has a cylindrical shape as a whole, and is coupled in a state where the first core portion 12A and the second core portion are positioned. The first and second core portions 12A and 12B are fixed to the cases 16A and 16B.

  The core bottom portion 12C includes a recess 121 on the other side in the axial direction. 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 in the axial direction of the core bottom portion 12 </ b> C with an 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 nonmagnetic material such as a polyester resin, an epoxy resin, or PTFE. If the spacer 15 is a non-magnetic material, the spacer 15 is not magnetized by the magnetic field from the coil 11. Therefore, the movement of the plunger 13 is not limited by the spacer 15.

  The spacer 15 has a connection portion 151 that connects the concave portion 121 and the plunger chamber 132 on the opposite side of the second hole 120 with respect to the central axis 100, that is, on the top side in the radial direction. For example, as illustrated in FIG. 5, the connection portion 151 of the spacer 15 is, for example, a connection hole. If the connection portion 151 is a connection 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 part 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. The spacer 15 desirably has a similar shape covering the opening of the recess 121 in order to secure a breathing path from the ground side toward the top side. The spacer 15 is engaged with, for example, an annular engagement portion 152 provided on the inner surface of the first core portion 12A. The annular coupling portion 152 is, for example, a step or a groove provided on the inner surface of the first core portion 12A.

  For example, as illustrated in FIG. 6, the spacer 15 includes a flat portion 153 on the outer side in the radial direction orthogonal to the axial direction. The flat portion 153 is an element for accurately performing alignment when the spacer 15 is engaged with the first core portion 12A. For example, the flat portion 153 can accurately align the second hole 120 with the ground side and the connection portion 151 with 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, contamination can be 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 engaged with the annular engagement portion 152. That is, the spacer 15 does not rotate around the central axis 100. Therefore, for example, the positional relationship in which the second hole 120 is the ground side and the connecting portion 151 is 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 the 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 disposed around the central axis 100. The recess 121 has, for example, a ring shape. In this case, the breathing path is a path that reaches the connection part 151 from the second hole 120 through the left side of the recess 121, and a path that reaches the connection part 151 from the second hole 120 through the right side of the recess 121. It becomes two. Therefore, the breathing of the solenoid device is further facilitated, and the responsiveness is further improved.

  The first hole 131 is preferably disposed 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 disposed on the ground side, the connecting portion 151 is disposed on the top side, and the first hole 131 is disposed on the ground side. This means that the number of cranks as the breathing path of the solenoid device increases. Therefore, even if contamination enters the plunger chamber 132, the contamination is difficult to diffuse throughout the plunger chamber 132. That is, the reliability of the solenoid device is further improved.

  In addition, 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 12C and the spacer 15, for example, the radially outer end of the recess 121 is the second end. It is located outside of 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 is caused by gravity to end on the ground side, that is, the outer end in the radial direction of the recess 121. Deposit on the part. At this time, if there is no contamination pocket 122, the accumulated contamination again moves to the top 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 thereof enters 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 away from the gas or liquid flow in the recess 121. Therefore, a situation in which the contamination accumulated in the contamination pocket 122 is diffused in the recess 121 and moves to the top side again does not occur. In other words, the contamination pocket 122 effectively prevents contamination from entering the plunger chamber 132 regardless of the amount of contamination entering.

  Cases 16A and 16B surround bobbin 10 and are coupled to first and second core portions 12A and 12B. The cases 16A and 16B are magnetic bodies such as iron, like the first and second core portions 12A and 12B. Cases 16A and 16B protect 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 easy assembly when, for example, the solenoid device is incorporated into the system. The seal member 101 is, for example, an O-ring. The seal 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 through a breathing path. The oil has an effect of smoothing the movement of the plunger 13, but if this oil leaks from the joint portion of the cases 16A and 16B, it is not desirable for the entire system. The seal 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, it is easy to incorporate the solenoid device into a system such as a valve system.

  The shaft pin 14 is a nonmagnetic material such as stainless steel, for example. For example, the shaft pin 14 is inserted into the plunger 13 in the axial direction and is 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 completely matched.

  Note that one side of the shaft pin 14 in the axial direction is exposed from the cases 16A and 16B. Moreover, one side of the axial direction of the shaft pin 14 may protrude from the cases 16A and 16B. For example, when the plunger 13 moves most to the other side in the axial direction, as shown in FIG. 1, for example, the shaft pin 14 is accommodated in the cases 16A and 16B. Moreover, when the plunger 13 moves most to the one side of an axial direction, as shown, for example in FIG. 2, the shaft pin 14 protrudes from cases 16A and 16B.

  As described above, according to the first example of the solenoid device, the spacer 15 is disposed so as to cover the other axial side of the core bottom while ensuring a recess space on the other axial side of the core bottom 12C. Is done. That is, a breathing path is provided between the spacer 15 and the core bottom 12C. This breathing path has a structure in which, for example, the opening side of the recess 121 is closed by the spacer 15. In addition, the core bottom portion 12C has a second hole 120 penetrating from the outside to the breathing path on the ground side in the radial direction. Further, the spacer 15 has a connection 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 the second hole 120, the recess 121, and the connection portion 151. In addition, this breathing path has a crank shape. In this case, for example, breathing of the solenoid device is ensured, responsiveness is improved, and contamination from the outside can be prevented. This is because the direction from the second hole 120 toward the connection portion 151 is a direction against gravity, that is, a direction from the ground side toward the celestial side. In this case, even if contamination enters the recess 121 from the second hole 120, the contamination does not easily reach the connection portion 151 due to its own weight, and does not enter the plunger chamber 132.

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

  Further, in the first example of the solenoid device, the above-described effects can be obtained from the viewpoint of contamination intrusion prevention and responsiveness, and the following effects can be obtained from the structure.

  The concave portion 121 serving as a 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 outside the solenoid device. The spacer 15 is generally made of a nonmagnetic material such as a polyester resin, an epoxy resin, or PTFE. These nonmagnetic 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 an 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 where the plunger has moved most 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 denoted by the same reference numerals, and detailed description thereof is omitted.

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

  If the connection portion 151 is a gap between the first core portion 12 </ b> A and the spacer 15, the connection portion 151 can be disposed 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, contamination is less likely to enter the plunger chamber 132.

  For example, as shown in FIG. 9, the spacer 15 may have a flat portion 153 on the outer side in the radial direction orthogonal to the axial direction. As described in the first example, the flat portion 153 is an element for accurately aligning the spacer 15. Accordingly, also in the second example, the positional relationship in which the second hole 120 is the ground side and the connection portion 151 is 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 where the plunger has moved most to the other side in the axial direction.
The third example is also a modification of the first example (FIGS. 1 to 6).
Accordingly, in the third example, the same elements as those in the first example are denoted by the same reference numerals, and detailed description thereof is omitted.

  Compared with the first example, the third example is characterized by the structure of the coupling portion between the first core portion 12A and the spacer 15. For example, the first core portion 12 </ b> A has an annular joining portion 152 to which the spacer 15 is joined. 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 12 </ b> A by the spacer 15 being engaged with the annular engagement portion 152. For example, as shown in FIG. 6, if the spacer 15 has a flat portion 153, the spacer 15 does not rotate around the central axis 100. Therefore, for example, the positional relationship in which the second hole 120 is the ground side and the connection portion 151 is 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 has moved most 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 denoted by the same reference numerals, and detailed description thereof is omitted.

  Compared with the third example, the fourth example is characterized in that the first core portion 12A and the spacer 15 are coupled by a so-called snap-fit structure. For example, the spacer 15 has a hook part. Further, the annular coupling portion 152 is a depression 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 12 </ b> A by the spacer 15 being engaged with the annular engagement portion 152. That is, the spacer 15 does not rotate around the central axis 100. Therefore, for example, the positional relationship in which the second hole 120 is the ground side and the connection portion 151 is 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 are completely matched, and the responsiveness of the solenoid device can be further improved.

FIG. 12 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 coupled to each other by caulking, for example. This is because caulking can be combined with both at a simple and low cost.

  In this case, the plunger 13 has a shaft hole 141 penetrating in the axial direction. For example, the shaft hole 141 is preferably provided at the center of the plunger 13, that is, arranged around the central axis 100. The plunger 13 has a painted surface portion 18. The painted surface portion 18 is a portion excluding the inner surface of the shaft hole 141 and the peripheral portion 19 that surrounds the edge of the shaft hole 141 on the surface of the plunger 13 facing in the axial direction, and is at least a radially outer side orthogonal to the axial direction. Is provided on the surface portion of the peripheral surface of the plunger 13 facing the direction.

  Further, when the painted surface portion 18 is provided also in the axial end surface portion excluding the peripheral portion 19 in the surface of the plunger 13 facing in the axial direction, the painted surface portion 18 is provided in a corner portion on the radially outer side of the plunger 13. become. In this way, if the painted surface portion 18 is continuous at the corner portion, it is possible to avoid a situation in which the painted surface portion 18 is peeled from the corner portion.

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

  The shaft pin 14 includes a recess in the circumferential direction surrounding the shaft pin 14. The concave portion of the shaft pin 14 is preferably provided, for example, in the entire circumferential direction, that is, in the entire circumference of 360 °. And a part of plunger 13 is crimped by the recessed part (caulking part) of the shaft pin 14. FIG.

  The crimping part 133 can be formed by the punch 17, for example. The punch 17 has a tapered tip. The tapered tip is used to deform a part of the plunger 13 and fix 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 plunger 13 is positioned so that the corner of the plunger 13 corresponds to the recess of the shaft pin 14, and both are temporarily fixed. Thereafter, the tapered tip of the punch 17 collides with the corner of the plunger 13 by sliding the punch in the axial direction.

  As a result, the corner portion of the plunger 13 is fitted into the concave portion of the shaft pin 14 to form a crimped portion 133.

  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 the painted surface portion 18 does not peel off when the plunger 13 is fixed to the shaft pin 14. In other words, a situation in which the painted surface portion 18 becomes a foreign substance, 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.

<Concentricity of plunger and shaft pin>
FIG. 13A shows an example 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 is supported, and the plunger 13 does not contact the case 16B of FIG. . This prevents the plunger 13 from being attracted to the case 16B when the plunger 13 and the case 16B are magnetized together.

  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 axes coincide with each other. 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 of Wh> Wp + (2 × W18). This means that the clearance between the inner surface of the shaft hole 141 and the surface of the shaft pin 14 is increased. This clearance reduces the coaxiality of 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 at least on the surface of the plunger facing outward in the radial direction 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 surrounding the edge of the shaft hole 141 on the surface.

  In this case, since it is not necessary to consider variations 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 only needs to 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 of the plunger 13 and the shaft pin 14. However, Wh and Wp are both sizes in the radial direction.

  In addition, when the coating surface part 18 is provided in the part except the peripheral part 19 among the surfaces of the plunger 13 facing the axial direction, 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 peeling of the painted surface portion 18 due to contact.

  For this purpose, for example, the radial size W19 of the peripheral portion 19 is desirably 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 contact 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 a position closest to the central axis 100, and guides the movement of the shaft pin 14 in the axial direction. Further, the spacer 15 ′ may be provided independently of the spacer 15 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 automobile field, 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 driving parts such as engines and transmissions. These hydraulic pressures are generated by a solenoid valve, and the solenoid device is used as a part of the solenoid valve.

  Hereinafter, some examples of the valve system to which the above-described 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 a solenoid valve 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. The valve device 30 is coupled to the solenoid device 20 and includes a spool 31 that is movable in the axial direction. The valve device 30 controls opening and closing of the valves 32A, 32B, 32C, 32D, and 32E according to the amount of movement of the spool 31.

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

  The relationship between the input pressure and the output pressure varies 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 an oil pump, the output pressure is arbitrarily set based on the input pressure and a lower or higher pressure depending on the position of the spool 31. Can be generated.

  The feedback pressure is, for example, 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 fluctuation of the output pressure, that is, oil vibration.

  The valve device 30 further includes a biasing member (for example, a spring) 33 that biases the spool 31 toward 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 flows through the solenoid coil, the biasing force of the biasing member 33 causes the spool 31 and the shaft pin 14 to move to the other side in the axial direction. Energize.

  This state is shown in the upper half of the figure. As apparent 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, 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 flows 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 the moving force to be. 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. The spool 31 also moves to one side in the axial direction following the movement of the shaft pin 14.

  This state is shown in the lower half of the figure. As is apparent 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 through the oil supply port 32E.

  Here, in the solenoid device 20, as described above, the second hole 120 is disposed on the ground side with respect to the central axis 100, and the connection portion 151 is disposed on the top side with respect to the central axis 100. In state, it is coupled to the valve device 30. Therefore, in such a valve system, even if the oil supplied into the solenoid device 20 from the oil supply port 32E 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 it is possible to effectively prevent contamination from entering the solenoid device from the valve device.

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

  The valve system includes a transmission 40, a control valve main body 41 that generates hydraulic pressure for controlling 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.

  The solenoid valve is attached to the control valve main body 41. The solenoid valve generates a hydraulic pressure for controlling the transmission 40 based on the hydraulic 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, a plurality of hydraulic pressures must be accurately controlled, and at the same time, the valve system must be sufficiently protected from contamination (metal powder, oxidized alteration, dust, etc.) contained in the oil. .

  In this example, the solenoid device 20 has a structure that prevents contamination from entering the plunger chamber as described above (see FIG. 14). Therefore, according to the valve system of this example, it is possible to accurately control a plurality of hydraulic pressures while preventing contamination in oil from entering the plunger chamber. That is, since the solenoid device can sufficiently breathe, the responsiveness of valve opening and closing in the valve system is improved. This means that a plurality of 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 of 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 the valve system.
The third example relates to a valve system in which a solenoid device can be attached to a valve body that controls the pressure of liquid or gas, for example, 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. The solenoid device 20 is fixed to the valve body 50 by, for example, a screw 162. For example, the screw 162 is attached to the flange portion 161 of the solenoid device 20.

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

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

  The relationship between the input pressure and the output pressure varies 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 an oil pump, the output pressure is arbitrarily set based on the input pressure and a lower or higher pressure depending on the position of the spool 51. Can be generated.

  The feedback pressure is, for example, 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 fluctuation of the output pressure, that is, oil vibration.

  The valve body 50 further includes a biasing member (for example, a spring) 53 that biases the spool 51 toward the other side in the axial direction.

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

  This state is shown in the upper half of the figure. As is apparent 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, 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 flows 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 the moving force to be. Therefore, if this moving force is greater than the urging force of the urging member 53, the shaft pin 14 moves to one side in the axial direction. The spool 51 also moves to one side in the axial direction following the movement of the shaft pin 14.

  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 through the oil supply port 52E.

  Here, in the solenoid device 20, as described above, the second hole 120 is disposed on the ground side with respect to the central axis 100, and the connection portion 151 is disposed 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 of the valve is improved, and contamination can be effectively prevented from entering the solenoid device.

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

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

10: Bobbin, 11: Coil, 12A: First core part, 12B: Second core part, 12C: Core bottom part, 13: Plunger, 14: Shaft pin, 15: Spacer, 16A, 16B: Case, 100: Central shaft, 101: Seal member, 120: Second hole, 121: Recess, 122: Contamination pocket, 131: First hole, 132: Plunger chamber, 151: Connection part, 152: Annular engagement part, 161: Flange part.

Claims (12)

Case and
A bobbin having a first cylindrical portion supported in the case and having a first central axis hole along the axial direction;
A coil wound around the first cylindrical portion;
A core having a second cylindrical portion disposed in the first central axis hole and having a second central axis hole along the axial direction;
A plunger made of a magnetic material, disposed in a 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;
A shaft pin inserted into the shaft hole;
With
The plunger has a painted surface part whose surface is coated,
The painted surface portion includes an inner surface of the shaft hole and a portion excluding a peripheral portion surrounding an edge of the shaft hole in an axial end surface of the plunger facing the axial direction, and a radially outer side perpendicular to the axial direction. Provided on the peripheral surface portion of the plunger facing,
Solenoid device. A spacer that is supported by the case, guides the movement of the shaft, and is disposed 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,
The solenoid device according to claim 1. The painted surface portion is made of metal.
The solenoid device according to claim 1 or 2. The shaft pin penetrates the plunger in the axial direction,
The first protrusion from which the shaft pin protrudes from the plunger on one side in the axial direction is longer than the second protrusion from 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 to 3. The shaft pin has a crimped portion in a circumferential direction surrounding the shaft pin,
The plunger includes a caulking portion that is pressed against the caulking portion,
The caulking portion is located in a peripheral portion surrounding an edge of the shaft hole,
The solenoid device according to any one of claims 1 to 4. The plunger has a breathing hole that penetrates the plunger in the axial direction;
The other side of the breathing hole is connected to the depression.
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 includes 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 via an air 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 a valve is driven by the shaft pin of the solenoid device;
Comprising
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;
The movement of the spool follows the movement of the plunger,
The control valve according to claim 10. The valve device controls oil pressure;
The control valve according to claim 11.

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