JP2012164752A - Mold coil and solenoid valve using mold coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold coil which ensures the electrical connection of a power supply terminal and the power supply terminal socket of a socket assembly, and the electrical connection of an earth terminal and the earth terminal socket of a socket assembly, and also ensures operation of a solenoid valve, and to provide a solenoid valve using the mold coil.SOLUTION: The resin molded coil used for driving the valve element of a solenoid valve comprises a bobbin around which the winding is wound, a pair of power supply terminals attached to the bobbin and connected electrically with the end of winding, a magnetic frame surrounding the bobbin, and an earth terminal connected to the magnetic frame. The earth terminal is connected and fixed to the inner wall of the magnetic frame.

Description

  The present invention relates to a molded coil that is used to drive a valve body of a solenoid valve and is molded with a resin, and a solenoid valve that uses the molded coil.

  Conventionally, in order to provide waterproofness to the coil used in the solenoid valve, a molded coil in which the entire coil is covered with resin is used, and the valve body is mounted in the valve body mounting hole of the molded coil, thereby configuring the solenoid valve. It has come to be.

  In this case, in a solenoid valve used for waterproofing, a so-called standardized socket assembly called a “DIN socket (or DIN connector)” is connected.

  That is, a pair of power supply terminals attached to the bobbin and electrically connected to the ends of the windings, a power supply terminal socket of the socket assembly, and a ground terminal connected to a magnetic frame surrounding the bobbin, The ground terminal socket of the socket assembly is electrically connected by connecting the socket assembly to the mold coil. For this reason, the relative position between the ground terminal and the power supply terminal, the protruding distance, and the like are determined by standards, and it is required to firmly fix the ground terminal to the magnetic frame.

  For this reason, in patent document 1 (Unexamined-Japanese-Patent No. 2004-349360), since the connection between the coil winding, the ground terminal, and the power supply terminal was conventionally performed by the terminal board and the lead wire, the connection was weak. A molded coil is disclosed in which a ground terminal is directly fixed to a resin coil bobbin to strengthen the connection, and further, a terminal board (printed board) is not required.

  That is, as shown in FIG. 20, in the molded coil 100 of Patent Document 1, the proximal end portion 104 of the ground terminal 102 is extended to the electromagnetic valve mounting hole 108 of the molded coil 106, whereby the electromagnetic valve 110. The molded coil 106 sandwiches the ground terminal 102 and electrically connects the solenoid valve 110 and the ground terminal 102.

  Patent Document 2 (Japanese Patent Laid-Open No. 2007-208177) discloses a molded coil 200 having a structure as shown in FIG. That is, in the molded coil 200, the power supply terminal 204 is fixed to the printed circuit board 202.

  Then, by engaging the engagement piece 208 of the ground terminal 206 with the engagement hole 211 of the magnetic frame 210, the ground terminal 206 is fixed to the outer wall side of the magnetic frame 210.

  The printed circuit board 202 is inserted and fixed between the outer wall of the magnetic frame 210 and the ground terminal 206, and the female screw 214 is screwed through the spacer 212 to fix the power supply terminal 204 to the magnetic frame 210. It is configured to do.

JP 2004-349360 A JP 2007-208177 A

  However, in such a conventional molded coil, when the molten resin is injected, the bobbin assembly composed of the bobbin and the magnetic frame surrounding the bobbin is displaced in the mold, and the thickness of the covering portion is partially The thickness may be reduced, the magnetic frame may be exposed on the surface of the covering portion, or the relative position between the ground terminal and the power feeding terminal, the protruding distance, and the like may be shifted.

  As a result, the socket assembly cannot be fixed to the molded coil, and the electrical connection between the power supply terminal and the power supply terminal socket of the socket assembly, and the electrical connection between the ground terminal and the ground terminal socket of the socket assembly are illustrated. As a result, the solenoid valve may malfunction.

  Further, in the molded coil 100 of Patent Document 1, the electromagnetic valve 110 and the molded coil 106 sandwich the ground terminal 102 so that the electromagnetic valve 110 and the ground terminal 102 are electrically connected. If the mold coil 106 is repeatedly attached / detached, the ground terminal 102 and the electromagnetic valve 110 are rubbed each time the attachment / detachment is performed, so that the contact surface is worn and the electrical contact is deteriorated. As a result, the electromagnetic valve 110 may malfunction. There is.

  Further, in the molded coil 200 of Patent Document 2, since the power supply terminal 204 and the ground terminal 206 are provided on the outer wall of the magnetic frame 210, the printed circuit board 202 is necessary, and the printed circuit board 202 is necessary, so that the molded coil is necessary. 200 will increase in size.

  When fixing and removing the socket assembly, force is applied to the female screw 214 in the rotational direction when fixing and removing the socket assembly to the female screw 214 at the tip of the spacer 212, so that the spacer 212 can rotate together. There is sex.

  Therefore, when the spacer 212 is rotated, a gap is generated between the ground terminal 206 and the magnetic frame 210, and the ground terminal 206 cannot be firmly connected.

  In view of the current situation, the present invention does not require positioning parts, and can position the bobbin and the magnetic frame at a predetermined position. The thickness of the cover part is partially reduced, the magnetic frame is exposed on the surface of the cover part, the relative position between the ground terminal and the power supply terminal, the protruding distance, etc. are not shifted, The relative position between the ground terminal and the power supply terminal, the protruding distance, etc. are constant. As a result, the electrical connection between the power supply terminal and the power supply terminal socket of the socket assembly, the ground terminal, and the ground terminal socket of the socket assembly It is an object of the present invention to provide a molded coil and a solenoid valve using the molded coil that can be reliably connected to each other and can reliably operate the solenoid valve.

  It is another object of the present invention to provide a molded coil that does not require a printed circuit board, can be downsized, and can be made compact, and an electromagnetic valve using the molded coil.

  Furthermore, an object of the present invention is to provide a mold coil and an electromagnetic valve using the mold coil that can improve moldability without causing a decrease in magnetic efficiency (magnetic loss).

The present invention was invented in order to achieve the problems and objects in the prior art as described above.
A molded coil used for driving a valve body of a solenoid valve and molded with resin,
A bobbin around which a winding is wound;
A pair of power supply terminals attached to the bobbin and electrically connected to the ends of the windings;
A magnetic frame surrounding the bobbin;
A ground terminal connected to the magnetic frame,
The ground terminal is connected and fixed to the inner wall of the magnetic frame.

  With this configuration, since the ground terminal is connected and fixed to the inner wall of the magnetic frame, the magnetic frame itself functions as the ground terminal.

  For this reason, the contact area of the ground terminal can be made larger than the conventional structure in which the ground terminal is sandwiched between the solenoid valve and the molded coil, and grounding can be achieved on all contact surfaces of the magnetic frame and the solenoid valve. Is more certain.

  In addition, since the printed circuit board is not required and the ground terminal is connected and fixed to the inner wall of the magnetic frame, the molded coil can be used in comparison with the conventional case where the ground terminal is connected and fixed to the outer wall of the magnetic frame. The size can be reduced, and the solenoid valve can be made compact.

The molded coil of the present invention is
An earth terminal positioning groove is formed in the bobbin, and the bobbin and the magnetic frame connected to the earth terminal are positioned at predetermined positions.

  With this configuration, since the earth terminal connected to the magnetic frame is fitted into the earth terminal positioning groove formed on the bobbin, the earth terminal positioning groove functions as a stopper, and within the magnetic frame. The bobbin can be prevented from rotating, and the positioning between the ground terminal and the bobbin can be reliably performed.

  Therefore, it is possible to position the bobbin and the magnetic frame at a predetermined position without the need for a separate positioning component. This allows the bobbin assembly to be displaced in the mold when molten resin is injected, so that the covering portion The thickness of the ground terminal and the power supply terminal are not reduced, the magnetic frame is exposed on the surface of the cover, the relative position between the ground terminal and the power supply terminal, the protruding distance, etc. are not shifted. Relative position, protrusion distance, etc. are constant.

  Further, even if the fixing position of the ground terminal with respect to the magnetic frame is slightly shifted, the positional relationship between the ground terminal and the power feeding terminal is constant.

  As a result, the electrical connection between the power supply terminal and the power supply terminal socket of the socket assembly, the electrical connection between the ground terminal and the ground terminal socket of the socket assembly can be ensured, and the solenoid valve can be operated reliably. .

The molded coil of the present invention is
In the magnetic frame, a plurality of through holes are formed at predetermined intervals,
The through holes are formed so as to be displaced from each other in the circumferential direction of the magnetic frame.

  By the way, through holes are provided in the magnetic frame so that the molten resin can easily penetrate into the inside of the magnetic frame at the time of molding. It becomes. When the magnetic loss is large, it is necessary to enlarge the coil.

  On the other hand, according to the molded coil of the present invention, a plurality of through holes are formed at a predetermined interval, and these through holes are formed so as to be displaced from each other in the circumferential direction of the magnetic frame. As a result, the cross-sectional area is reduced to a minimum, and as a result, the moldability can be improved without causing a decrease in magnetic efficiency (magnetic loss).

The molded coil of the present invention is
The magnetic frame is formed with a feed terminal notch for preventing the feed terminal from being in electrical contact with the magnetic frame.

  By configuring in this way, the power supply terminal notch for preventing the power supply terminal from being in electrical contact with the magnetic frame is formed in the magnetic frame, so that the power supply terminal 26 is brought close to the bobbin 24. Therefore, the molded coil can be made compact.

The molded coil of the present invention is
The magnetic frame is characterized in that a through hole or a notch for a jig for connecting and fixing the ground terminal to the inner wall of the magnetic frame is formed.

  With this configuration, a jig for connecting and fixing the ground terminal to the inner wall of the magnetic frame can be inserted through the through hole or notch to securely connect and fix the ground terminal to the inner wall of the magnetic frame. .

The molded coil of the present invention is
On the upper surface of the bobbin, a projecting portion projecting on the magnetic frame side is formed,
When the bobbin assembly composed of the bobbin and the power supply terminal is inserted into the magnetic frame, the projecting portion is compressed and deformed by the magnetic frame, thereby filling the gap between the bobbin assembly and the magnetic frame, The magnetic frame is configured to be fixed.

    That is, a bobbin assembly including a bobbin and a power supply terminal is inserted into a magnetic frame to assemble a coil assembly. When the coil assembly is tilted sideways, a gap is formed between the bobbin assembly and the magnetic frame. Therefore, the bobbin assembly may fall off from the magnetic frame or the position of the bobbin assembly with respect to the magnetic frame may be displaced, which may hinder assembly.

  For this reason, by forming such a protruding portion on the top of the bobbin in this way, when the bobbin assembly consisting of the bobbin and the power supply terminal is inserted (press-fitted) into the magnetic frame, the protruding portion is compressed and deformed. It is crimped by doing. That is, since the projecting portion that has been compressed and deformed fills the gap between the bobbin assembly and the magnetic frame, the bobbin assembly and the magnetic frame can be firmly fixed.

  Therefore, since the bobbin assembly is fixed to the magnetic frame while being pressed by the compressive deformation force of the projecting portion, assembly is facilitated.

  Moreover, this invention is an electromagnetic valve by which the valve main body was mounted | worn with the valve main body mounting hole of the mold coil in any one of the above-mentioned.

  According to the present invention, since the ground terminal is connected and fixed to the inner wall of the magnetic frame, the magnetic frame itself functions as the ground terminal.

  For this reason, the contact area of the ground terminal can be made larger than the conventional structure in which the ground terminal is sandwiched between the solenoid valve and the molded coil, and grounding can be achieved on all contact surfaces of the magnetic frame and the solenoid valve. Is more certain.

  In addition, since the printed circuit board is not required and the ground terminal is connected and fixed to the inner wall of the magnetic frame, the molded coil can be used in comparison with the conventional case where the ground terminal is connected and fixed to the outer wall of the magnetic frame. The size can be reduced, and the solenoid valve can be made compact.

  In addition, since the earth terminal connected to the magnetic frame is fitted into the earth terminal positioning groove formed on the bobbin, the earth terminal positioning groove functions as a stopper, and the bobbin rotates in the magnetic frame. Therefore, positioning between the ground terminal and the bobbin can be reliably performed.

  Therefore, it is possible to position the bobbin and the magnetic frame at a predetermined position without the need for positioning parts, which causes the bobbin assembly to shift in the mold when molten resin is injected, and the thickness of the covering portion The relative position between the ground terminal and the power supply terminal is not reduced, the magnetic frame is not exposed on the surface of the cover, the relative position between the ground terminal and the power supply terminal, the protruding distance, etc. are not shifted. The protruding distance is constant.

  Further, even if the fixing position of the ground terminal with respect to the magnetic frame is slightly shifted, the positional relationship between the ground terminal and the power feeding terminal is constant.

  As a result, the electrical connection between the power supply terminal and the power supply terminal socket of the socket assembly, the electrical connection between the ground terminal and the ground terminal socket of the socket assembly can be ensured, and the solenoid valve can be operated reliably. .

FIG. 1 is a partial cross-sectional view of an electromagnetic valve in which a valve body is mounted in a valve body mounting hole of a molded coil according to the present invention. FIG. 2 is a view taken along the line AA in FIG. FIG. 3 is a perspective view of the magnetic frame of the molded coil of the present invention. FIG. 4 is a perspective view showing a state in which a ground terminal is connected and fixed to the magnetic frame of the molded coil of the present invention. FIG. 5 is a partially enlarged cross-sectional view for explaining a method of connecting and fixing a ground terminal to the magnetic frame of the molded coil of the present invention. FIG. 6 is a perspective view showing a state in which a ground terminal is connected and fixed to a magnetic frame of the molded coil of the present invention and a bobbin is mounted. FIG. 7 is a partially enlarged top view of the bottom surface of the magnetic frame in a state where the ground terminal is connected and fixed to the magnetic frame of the molded coil of the present invention. FIG. 8 is a bottom view showing the earth terminal positioning groove of the bobbin of the molded coil of the present invention. FIG. 9 illustrates a state in which the ground terminal positioning groove functions as a stopper by fitting the ground terminal connected to the magnetic frame into the ground terminal positioning groove formed on the bobbin of the molded coil of the present invention. FIG. FIG. 10 is a cross-sectional view showing a state in which a ground terminal is connected and fixed to a magnetic frame of a molded coil of the present invention and a bobbin is mounted. FIG. 11 is a cross-sectional view showing a state in which a ground terminal is connected and fixed to a magnetic frame of a molded coil of the present invention, a bobbin is mounted, and molded with a molten resin. 12 is a view in the direction of arrow B in FIG. FIG. 13 is an end view of the connection portion of the socket assembly of the molded coil according to the present invention with the molded coil. FIG. 14 is a partial cross-sectional view of an electromagnetic valve having a valve body mounted in a valve body mounting hole of a molded coil according to another embodiment of the present invention. FIG. 15 is a view taken along the line AA in FIG. FIG. 16 is a perspective view of a magnetic frame of a molded coil according to another embodiment of the present invention. FIG. 17 is a top view of the bobbin of the molded coil of the present invention. FIG. 18 is a cross-sectional view of the bobbin of the molded coil of the present invention. 19 is a partial enlarged cross-sectional view showing a method for manufacturing a molded coil according to the present invention. FIG. 19A is an enlarged view of a portion A in FIG. 18, and FIG. 19B is a portion B in FIG. FIG. FIG. 20 is a cross-sectional view of a conventional molded coil. FIG. 21 is a cross-sectional view of a conventional molded coil.

  Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings.

  FIG. 1 is a partial cross-sectional view of an electromagnetic valve having a valve body mounted in a valve body mounting hole of a molded coil of the present invention, FIG. 2 is a view taken along the line AA in FIG. 1, and FIG. FIG. 4 is a perspective view showing a state in which a ground terminal is connected and fixed to the magnetic frame of the molded coil of the present invention, and FIG. 5 is a magnetic frame of the molded coil of the present invention. FIG. 6 is a perspective view showing a state in which the ground terminal is connected and fixed to the magnetic frame of the molded coil of the present invention and the bobbin is mounted. FIG. 8 is a partially enlarged top view of the bottom surface of the magnetic frame in a state where the ground terminal is connected and fixed to the magnetic frame of the molded coil of the present invention, and FIG. 8 shows the groove for positioning the ground terminal of the bobbin of the molded coil of the present invention. Bottom view, figure FIG. 4 is a schematic diagram for explaining a state in which the ground terminal positioning groove functions as a stopper by fitting the ground terminal connected to the magnetic frame into the ground terminal positioning groove formed on the bobbin of the molded coil of the present invention. FIG. 10 is a cross-sectional view showing a state in which a ground terminal is connected and fixed to the magnetic frame of the molded coil of the present invention and a bobbin is mounted. FIG. 11 is a diagram of connecting the ground terminal to the magnetic frame of the molded coil of the present invention. FIG. 12 is a cross-sectional view showing a state of fixing, mounting a bobbin, and molding with a molten resin, FIG. 12 is a view in the direction of arrow B in FIG. 11, and FIG. 13 is a view showing a mold coil of a socket assembly of a mold coil according to the present invention. It is an end view of a connection part.

  In FIG. 1, the code | symbol 10 has shown the solenoid valve of the state which mounted | wore with the molded coil of this invention as a whole.

  As shown in FIG. 1, the electromagnetic valve 10 includes a valve body 12, a molded coil 16 to which a drive unit 14 of the valve body 12 is mounted, and a socket assembly 18 connected to the molded coil 16. ing.

  As shown in FIG. 3, the molded coil 16 is composed of a magnetic frame 20 having a substantially rectangular shape by bending a flat plate into a square and a bobbin 24 around which a winding 22 is wound. That is, as shown in FIG. 6, the magnetic frame 20 is attached to the outside of the bobbin 24 so as to surround the bobbin 24.

  Further, as shown in FIGS. 1, 6, and 10, a pair of power supply terminals 26 to which the ends of the windings 22 are electrically connected are fixed to the bobbin 24 by press-fitting. . As shown in FIG. 6, the power supply terminal 26 includes an extended portion 26b extending downward from the base end portion 26a, and a power supply terminal protruding from the extended portion 26b toward the socket assembly 18. Part 26c.

  Further, as shown in FIGS. 9A, 10, and 17 to 19, the upper portion of the bobbin 24 is located upward, that is, on the magnetic frame 20 side, on the upper plate portion 20d side of the magnetic frame 20. A protruding portion 21 that protrudes is formed.

  That is, the bobbin assembly including the bobbin 24 and the power supply terminal 26 is inserted into the magnetic frame to assemble the coil assembly 15. At this time, when the coil assembly 15 is tilted sideways, the bobbin assembly and the magnetic frame 20 are assembled. The bobbin assembly may fall off from the magnetic frame 20 or the position of the bobbin assembly with respect to the magnetic frame 20 may be displaced, which may hinder assembly.

  For this reason, as shown in FIG. 19A, by forming such a protruding portion 21 on the top of the bobbin 24, as shown in FIG. When the bobbin assembly to be inserted is inserted (press-fitted) into the magnetic frame, the projecting portion 21 is compressed by being deformed by compression. That is, the projecting portion 21 that has been compressed and deformed fills the gap between the bobbin assembly and the magnetic frame 20, so that the bobbin assembly and the magnetic frame 20 can be firmly fixed.

  Accordingly, since the bobbin assembly is fixed to the magnetic frame 20 by the compressive deformation force of the projecting portion 21, the assembly is facilitated.

  Furthermore, as shown in FIGS. 10, 18 and 19, the bobbin 24 is formed with a first acute angle protrusion 25a having a substantially acute triangular shape projecting in the outer peripheral direction at the outer peripheral end thereof. Yes.

  As shown in FIG. 18, a first acute angle protrusion 25a having a substantially acute triangular shape projecting in the outer peripheral direction is formed at the outer peripheral end of the lower part of the bobbin 24 as well.

  When the first acute angle protrusion 25a is molded with molten resin, the acute angle portion of the first acute angle protrusion 25a is melted by the heat of the molten resin. Thereby, the molten resin and the bobbin 24 are integrated, and the adhesion between the bobbin 24 and the mold resin is improved.

  In particular, when the adhesiveness between the material of the bobbin 24 and the molten resin is poor, the adhesiveness is improved by increasing the number of acute angle portions by such acute protrusions. For example, as shown in FIG. 19, in the upper part of the bobbin 24, in the vicinity of the outer peripheral end thereof, the direction perpendicular (90 degrees) to the protruding direction of the first acute angle protruding portion 25a, that is, upward If the second acute angle protruding portion 25b that protrudes (in the direction of the upper plate portion 20d of the magnetic frame 20) is provided, the adhesion is improved without being influenced by the flow of the molten resin during molding.

  As shown in FIG. 18, a first acute angle protrusion 25a having a substantially acute triangular shape projecting in the outer peripheral direction is formed at the outer peripheral end of the lower part of the bobbin 24 as well.

  In this case, the number, shape, arrangement position, and the like of the projecting portions 21, the first acute angle protrusions 25a, and the second acute angle protrusions 25b can be appropriately selected as long as they have the above-described effects. is there.

  Further, as shown in FIGS. 3, 4, and 5 (A), a ground terminal 28 is connected and fixed to the inner wall side of the bottom plate portion 20 a of the magnetic frame 20 in the direction of the socket assembly 18.

  That is, as shown in FIG. 4 and FIG. 5A, the bottom plate portion 20a of the magnetic frame 20 is provided with a caulking convex portion 20b protruding from the inner wall side. A caulking hole 28b is formed in the portion 28a.

  As a result, the caulking convex portion 20b of the bottom plate portion 20a of the magnetic frame 20 is engaged with the caulking hole portion 28b provided in the base end portion 28a of the ground terminal 28, and the bottom plate portion 20a of the magnetic frame 20 is engaged. The base end portion 28a of the ground terminal 28 is configured to be electrically and firmly connected and fixed to the inner wall side of the bottom plate portion 20a of the magnetic frame 20 by caulking from the inner wall side with a jig such as a punch. ing.

  In addition to the caulking process shown in FIG. 5 (A), the base end portion 28a of the ground terminal 28 can be electrically and firmly connected and fixed to the inner wall side of the bottom plate portion 20a of the magnetic frame 20. As shown in FIG. 5 (B), a weld 33 fixes between the caulking hole 28 b provided in the base end portion 28 a of the ground terminal 28 and the caulking convex portion 20 b of the bottom plate portion 20 a of the magnetic frame 20. It is also possible to do.

  In this case, as shown in FIG. 3, the upper plate portion 20 d of the magnetic frame 20 is prevented from being in electrical contact with the magnetic frame 20 in the direction of the socket assembly 18. The feed terminal notch 30 is formed. Further, a jig notch 32 for inserting a jig such as a punch or a welding jig is formed at the center of the power supply terminal notch 30.

  As a result, the power supply terminal notch 30 for preventing the power supply terminal 26 from making electrical contact with the magnetic frame 20 is formed on the upper plate portion 20d of the magnetic frame 20, so that the power supply terminal 26 is connected to the bobbin. Thus, the mold coil 16 can be made compact.

  In addition, since a jig notch 32 for inserting a jig such as a punch or a welding jig is formed at the center of the power supply terminal notch 30, the ground terminal 28 is formed on the inner wall of the magnetic frame 20. A jig such as a punch or a welding jig to be connected and fixed can be inserted through the jig notch 32 to securely connect and fix the ground terminal 28 to the inner wall of the magnetic frame 20.

  In addition, as shown in FIG. 5C, a caulking convex portion 28c is projected downward from the base end portion 28a of the ground terminal 28, and the caulking hole portion 20c is formed on the bottom plate portion 20a of the magnetic frame 20. May be formed.

  That is, the caulking convex portion 28 c of the base end portion 28 a of the ground terminal 28 is engaged with the caulking hole portion 20 c of the bottom plate portion 20 a of the magnetic frame 20, so that the punch is formed from the outer wall side of the bottom plate portion 20 a of the magnetic frame 20. The base end portion 28a of the ground terminal 28 may be connected and fixed to the inner wall side of the bottom plate portion 20a of the magnetic frame 20 by caulking with a jig such as.

  Further, as shown in FIG. 5D, the gap between the caulking convex portion 28 c of the base end portion 28 a of the ground terminal 28 and the caulking hole portion 20 c of the bottom plate portion 20 a of the magnetic frame 20 is fixed by welding 33. It is also possible.

  In the case of FIGS. 5C and 5D, a jig such as a punch or a welding jig for connecting and fixing the ground terminal 28 to the inner wall of the magnetic frame 20 from the outer wall side of the magnetic frame 20 may be used. Therefore, the jig notch 32 of the magnetic frame 20 is not required, the configuration of the magnetic frame 20 is simple, and the cost can be reduced.

  Further, as shown in FIG. 4, the ground terminal 28 extends upward from the base end portion 28a of the ground terminal 28, and protrudes in the direction of the socket assembly 18 from the extended portion 28d. Ground terminal portion 28e.

  Further, as shown in FIGS. 3 and 4, the magnetic frame 20 in which the flat plate is bent into a square shape to have a substantially square-shaped cross section, the mating portion 34 is connected to the base end portion 28 a of the ground terminal 28. Is formed on one side plate portion 20e of the magnetic frame 20. Further, the center portion of the mating portion 34 is composed of a tapered convex portion 34a and a tapered concave portion 34b complementary to the tapered convex portion 34a, and the convex portion 34a and the concave portion 34b are connected to each other. By fitting, the magnetic frame 20 is integrated and is excellent in strength.

  As shown in FIGS. 3 and 4, a plurality of through holes 36 are formed in the bottom plate portion 20 a, the upper plate portion 20 d, and the side plate portion 20 e of the magnetic frame 20 at a predetermined interval.

  Further, in this embodiment, the through holes 36 formed in the side plate portion 20e of the magnetic frame 20 are formed so as to be shifted from each other in the circumferential direction of the magnetic frame 20, as shown in FIG. Yes.

  That is, since the magnetic frame 20 made of metal and the mold resin 38 have different wettability, the through holes 36 are provided in the magnetic frame 20 so that the molten resin can easily penetrate into the magnetic frame 20 during molding. Further, in this case, when a plurality of through holes 36 are provided, a portion where the cross-sectional area is extremely reduced is formed, resulting in magnetic loss. When the magnetic loss is large, it is necessary to enlarge the coil.

  On the other hand, a plurality of through holes 36 are formed at a predetermined interval, and these through holes 36 are formed so as to be displaced from each other in the circumferential direction of the magnetic frame 20, so that the cross-sectional area is minimized. As a result, moldability can be improved without causing a decrease in magnetic efficiency (magnetic loss).

  Further, as shown in FIGS. 3 and 4, the upper plate portion 20 d of the magnetic frame 20 is formed with a bolt insertion hole 31 for screwing the driving portion 14 of the valve body 12 at the center thereof. . In addition, the bottom plate portion 20a of the magnetic frame 20 is formed with a drive portion insertion hole 40 for inserting the drive portion 14 of the valve main body 12 in the center portion thereof.

  As shown in FIGS. 7 and 8, the ground terminal positioning groove is formed on the lower surface of the bobbin 24 at a position corresponding to the base end portion 28a of the ground terminal 28 connected and fixed to the magnetic frame 20 of the coil assembly 15. 42 is formed.

  With this configuration, as shown in FIG. 9B, when the coil assembly 15 is mounted in the magnetic frame 20, as shown by the arrow in FIG. The stopper surface 42a of the ground terminal positioning groove 42 comes into contact with one end portion 28f of the base end portion 28a to function as a stopper.

  Further, when the coil assembly 15 is mounted in the magnetic frame 20, the ground terminal positioning grooves are formed in the side end portions 28g on both sides of the base end portion 28a of the ground terminal 28 as shown in FIG. Stopper side surfaces 42b on both sides of the abutment 42 come into contact with each other to prevent the bobbin 24 from rotating in the magnetic frame 20.

  In this case, in order to perform the above-described stopper function and rotation prevention function, at least the one end portion 28f of the base end portion 28a of the ground terminal 28 and the stopper surface 42a of the ground terminal positioning groove 42 are in contact with each other. The one side end portion 28g of the base end portion 28a of the 28 may be in contact with the stopper side surface 42b on one side of the ground terminal positioning groove 42.

  The molded coil 16 configured as described above is manufactured as follows.

  First, as shown in FIGS. 3, 4, and 5 (A), the caulking protrusion of the bottom plate portion 20 a of the magnetic frame 20 is inserted into the caulking hole portion 28 b provided in the base end portion 28 a of the ground terminal 28. By engaging the portion 20b and caulking with a jig such as a punch from the inner wall side of the bottom plate portion 20a of the magnetic frame 20, the base of the ground terminal 28 is formed on the inner wall side of the bottom plate portion 20a of the magnetic frame 20. The end portion 28a is electrically and firmly connected and fixed.

  As shown in FIG. 9, when the coil assembly 15 is mounted in the magnetic frame 20, the stopper surface 42 a of the ground terminal positioning groove 42 is formed on the one end 28 f of the base end 28 a of the ground terminal 28. Abut and function as a stopper.

  When the coil assembly 15 is mounted in the magnetic frame 20, the stopper side surfaces 42 b on both sides of the ground terminal positioning groove 42 are respectively applied to the side end portions 28 g on both sides of the base end portion 28 a of the ground terminal 28. In contact therewith, it functions as an anti-rotation mechanism that prevents the bobbin 24 from rotating within the magnetic frame 20.

  Thereby, as shown in FIG. 10, the positioning between the ground terminal 28 and the bobbin 24 can be performed reliably.

  Then, in this state, it is placed in a mold (not shown) and injected with molten resin, so that the bobbin assembly is displaced in the mold, and the thickness of the covering portion is partially reduced, or the magnetic frame 20 Is not exposed on the surface of the covering portion of the mold resin 38.

Moreover, even when the molten resin is injected, as shown in FIG. 2, the relative position between the ground terminal 28 and the power supply terminal 26 (the distance L1 between the ground terminal 28 and the power supply terminal 26, the power supply terminals 26 and 26, Distance L2), the protruding distance (distance L3 between the tip of the ground terminal 28 and the tip of the power supply terminal 26) and the like are not shifted, and the relative position between the ground terminal 28 and the power supply terminal 26, the protrusion The distance and the like are constant. Even if the fixing position of the ground terminal 28 with respect to the magnetic frame 20 is slightly shifted, the positional relationship between the ground terminal 28 and the power feeding terminal is constant.

  As a result, as will be described later, as shown in FIGS. 12 and 13, as shown in FIGS. 12 and 13, the electrical connection between the power supply terminal 26 and the power supply terminal socket 44 of the socket assembly 18, the ground terminal 28, and the ground of the socket assembly 18. A reliable electrical connection with the terminal socket 46 can be achieved, and the solenoid valve 10 can be operated reliably.

  As shown in FIG. 1, the drive unit 14 of the valve body 12 is inserted and fixed in the mold coil 16 molded with the mold resin 38 in this way.

  That is, the drive part 14 of the valve body 12 is inserted into the drive part insertion hole 40 formed in the bottom plate part 20 a of the magnetic frame 20 and the drive part insertion hole 24 a of the bobbin 24. Then, the fastening bolt 48 is screwed into the screw hole 52 formed in the attractor 50 of the drive unit 14 via the bolt insertion hole 31 formed in the upper plate portion 20d of the magnetic frame 20, and the valve body is connected to the mold coil 16. Twelve drive units 14 are inserted and fixed.

  In FIG. 1, reference numeral 54 is a plunger connected to a valve body (not shown), 56 is an urging spring interposed between the suction element 50 and the plunger 54, and 58 is a sealing material. Yes.

  As shown in FIGS. 1 and 14, the socket assembly 18 is connected to the mold coil 16 that is inserted and fixed in this way through the drive portion 14 of the valve body 12.

  That is, if the electrical connection between the power supply terminal 26 and the power supply terminal socket 44 of the socket assembly 18 and the electrical connection between the ground terminal 28 and the ground terminal socket 46 of the socket assembly 18 are performed, the solenoid valve of the present invention. 10 is configured.

  In order to connect the socket assembly 18 to the mold coil 16, as shown in FIG. 1, a female screw 60 provided on the mold coil 16 side and a male screw 62 provided on the power supply terminal socket 44 side are screwed together. do it.

  According to the thus configured molded coil 16 and the electromagnetic valve 10 including the molded coil 16, the ground terminal 28 is connected and fixed to the inner wall of the magnetic frame 20. Function as.

  Therefore, the contact area of the ground terminal 28 can be made larger than the conventional structure in which the ground terminal is sandwiched between the solenoid valve and the molded coil, and the ground can be grounded on all the contact surfaces of the magnetic frame 20 and the solenoid valve 10. More reliable electrical contact.

  Further, since a printed circuit board is not required and the ground terminal 28 is connected and fixed to the inner wall of the magnetic frame 20, the mold is used in comparison with the conventional case where the ground terminal is connected and fixed to the outer wall of the magnetic frame. The coil can be miniaturized and the solenoid valve can be made compact.

  In addition, since the earth terminal 28 connected to the magnetic frame 20 is fitted into the earth terminal positioning groove 42 formed on the bobbin 24, the earth terminal positioning groove 42 functions as a stopper, and in the magnetic frame 20 The bobbin 24 can be prevented from rotating, and the positioning between the ground terminal 28 and the bobbin 24 can be performed reliably.

  Therefore, it is possible to position the bobbin 24 and the magnetic frame 20 at a predetermined position without requiring a positioning part. As a result, when the molten resin is injected, the bobbin assembly is displaced in the mold, and the covering portion And the magnetic frame 20 is not exposed on the surface of the covering portion, the relative position between the ground terminal 28 and the power supply terminal 26, the protruding distance, and the like are not shifted. The relative position with respect to the power supply terminal 26, the protruding distance, and the like are constant.

  Further, even if the fixing position of the ground terminal 28 with respect to the magnetic frame 20 is slightly shifted, the positional relationship between the ground terminal 28 and the power supply terminal 26 is constant.

  As a result, the electrical connection between the power supply terminal 26 and the power supply terminal socket 44 of the socket assembly 18 and the reliable electrical connection between the ground terminal 28 and the ground terminal socket 46 of the socket assembly 18 can be achieved. Can be reliably operated.

  FIG. 14 is a partial cross-sectional view of a solenoid valve having a valve body mounted in a valve body mounting hole of a molded coil according to another embodiment of the present invention, and FIG. 15 is a view taken along the line AA in FIG. FIG. 16 is a perspective view of a magnetic frame of a molded coil according to another embodiment of the present invention.

  The electromagnetic valve 10 of this embodiment has basically the same configuration as that of the electromagnetic valve 10 shown in FIGS. 1 to 13, and the same components are denoted by the same reference numerals and detailed description thereof is omitted. Description is omitted.

  In the electromagnetic valve 10 of this embodiment, the upper plate portion 20d of the magnetic frame 20 of the molded coil 16 is prevented from being in electrical contact with the magnetic frame 20 in the direction of the socket assembly 18. The power supply terminal notch 30 is not formed.

  Therefore, the power supply terminal 26 protrudes in the direction of the socket assembly 18 so that the power supply terminal 26 does not come into contact with the magnetic frame 20 as compared with the magnetic frame 20, and accordingly, the ground terminal 28 also protrudes in the direction of the socket assembly 18. It has become.

  A jig through hole 64 for inserting a jig such as a punch or a welding jig is formed in the upper plate portion 20 d of the magnetic frame 20.

  Further, the magnetic frame 20 has a mating portion 34 formed on the bottom plate portion 20a of the magnetic frame 20 of the magnetic frame 20 so as to avoid the connection position of the proximal end portion 28a of the proximal end portion 28a of the ground terminal 28. .

  Further, as shown in FIG. 16, the bolt insertion hole 31 formed in the upper plate portion 20d of the magnetic frame 20 is formed with a key groove 31a, so that a jig can be used when crimping or molding with molten resin. It is configured to prevent rotation inside.

  In this case, the power supply terminal 26 and the ground terminal 28 are slightly larger than the molded coil 16 shown in FIGS. 1 to 13 due to the protrusion in the direction of the socket assembly 18. The same effect as the mold coil 16 shown in FIGS.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this. For example, in the above embodiment, the ground terminal 28 is provided on the inner wall side of the bottom plate portion 20a of the magnetic frame 20. The base end portion 28a of the magnetic frame 20 can be connected and fixed to the upper plate portion 20d and the side plate portion 20e of the magnetic frame 20 on the inner wall side of the magnetic frame 20.

  In the above embodiment, the magnetic frame 20 has a substantially rectangular shape with a flat plate bent into a square. However, the magnetic frame 20 may have a U-shaped bent shape, or a combination of a plurality of flat plates. The magnetic frame 20 may be formed.

  The valve body 12 can be variously modified without departing from the object of the present invention, such as being applicable to various valve bodies such as a two-way valve and a three-way valve.

  The present invention is used to drive a valve body of an electromagnetic valve, and can be applied to a molded coil molded with resin and an electromagnetic valve using the molded coil.

DESCRIPTION OF SYMBOLS 10 Solenoid valve 12 Valve body 14 Drive part 15 Coil assembly 16 Mold coil 18 Socket assembly 20 Magnetic frame 21 Protruding part 20a Bottom plate part 20b Caulking convex part 20c Caulking hole part 20d Upper plate part 20e Side plate part 22 Winding 24 Bobbin 24a Drive portion insertion hole 25a First acute angle protrusion 25b Second acute angle protrusion 26 Power supply terminal 26a Base end portion 26b Extension portion 26c Power supply terminal portion 28 Ground terminal 28a Base end portion 28b Caulking hole 28c Caulking Protruding portion 28d Extension portion 28e Ground terminal portion 28f One end portion 28g Side end portion 30 Feeding terminal notch 31 Bolt insertion hole 31a Key groove 32 Jig notch 33 Welding 34 Matching portion 34a Convex portion 34b Recessed portion 36 Through hole 38 Mold resin 40 Drive portion insertion hole 42 Ground terminal positioning groove 42a Stopper surface 42b Stopper side 44 Power supply terminal socket 46 Ground terminal socket 48 Fastening bolt 50 Suction element 52 Screw hole 54 Plunger 56 Biasing spring 58 Sealing material 60 Female screw 62 Male screw 64 Jig through hole 100 Mold coil 102 Ground terminal 104 Base end portion 106 Mold coil 108 Solenoid valve mounting hole 110 Solenoid valve 200 Mold coil 202 Printed circuit board 204 Power supply terminal 206 Ground terminal 208 Engagement piece 210 Magnetic frame 211 Engagement hole 212 Spacer 214 Female thread

Claims (7)

A molded coil used for driving a valve body of a solenoid valve and molded with resin,
A bobbin around which a winding is wound;
A pair of power supply terminals attached to the bobbin and electrically connected to the ends of the windings;
A magnetic frame surrounding the bobbin;
A ground terminal connected to the magnetic frame,
A molded coil, wherein the ground terminal is connected and fixed to an inner wall of a magnetic frame.   The grounding terminal positioning groove is formed in the bobbin, and the bobbin and the magnetic frame to which the grounding terminal is connected are configured to be positioned at a predetermined position. Mold coil. In the magnetic frame, a plurality of through holes are formed at predetermined intervals,
The molded coil according to claim 1, wherein the through holes are formed so as to be displaced from each other in the circumferential direction of the magnetic frame.   The mold according to any one of claims 1 to 3, wherein the magnetic frame is formed with a notch for a feeding terminal for preventing the feeding terminal from being in electrical contact with the magnetic frame. coil.   The molded coil according to any one of claims 1 to 4, wherein a through hole or a notch for a jig for connecting and fixing the ground terminal to the inner wall of the magnetic frame is formed in the magnetic frame. On the upper surface of the bobbin, a projecting portion projecting on the magnetic frame side is formed,
When the bobbin assembly composed of the bobbin and the power supply terminal is inserted into the magnetic frame, the projecting portion is compressed and deformed by the magnetic frame, thereby filling the gap between the bobbin assembly and the magnetic frame, The molded coil according to claim 1, wherein the molded coil is fixed to the magnetic frame.   An electromagnetic valve having a valve body mounted in the valve body mounting hole of the molded coil according to any one of claims 1 to 6.

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