JP2007208177A - Solenoid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently manufacture a solenoid of high quality. <P>SOLUTION: The solenoid 12 has a solenoid assembly 24 and a resin mold object 25. The solenoid assembly 24 has a bobbin 26 having an iron core built inside and a coil 28 wound on outside, and a magnetic frame 29 in which the bobbin 26 is built. To the magnetic frame 29, a spacer 37 which contacts with the inside of a metallic mold for resin forming in the case of molding the resin mold object 25 is attached. To the spacer 37, a connector as a connection member is attached with a screw member. The spacer 37 is embedded in the resin mold object 25 with its exposed surface 38 exposed to the outside. Thus, the spacer 37 sets the thickness of the resin mold object 25, and the connector is connected to the spacer 37. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a solenoid that drives a movable iron core in the axial direction, and more particularly to a solenoid that drives a movable iron core to which a valve body is attached.

  A fluid control valve is mounted on the fluid pressure circuit in order to control a fluid pressure operating device that operates by fluid pressure such as air pressure. The fluid control valve includes a direction control valve for switching and controlling the flow direction of the fluid, a pressure control valve for controlling the pressure of the fluid, and a flow rate control valve for controlling the flow rate of the fluid. As the valve bodies of these control valves, there are poppet type valve bodies, spool type valve bodies or slide type valve bodies, and there are electromagnetic valves in which the valve bodies are driven by electromagnets.

The electromagnetic valve has a solenoid and a plunger incorporated in the solenoid, that is, a movable iron core, and a valve body is attached to the movable iron core. The solenoid includes a bobbin around which the coil is wound, a magnetic frame that forms a magnetic path that guides a magnetic field generated by energizing the coil, and a power supply terminal for supplying power to the coil. The movable iron core is incorporated inside the bobbin so as to be movable in the axial direction (see Non-Patent Document 1).
Page 473 of the new edition of the Pneumatic and Pneumatic Handbook (issued on February 25, 1989 by Ohmsha)

  When the outside of the solenoid assembly is covered with a resin material and the resin material is filled in the gaps between the members such as between the magnetic frame and the coil constituting the solenoid assembly, the resin mold body makes the solenoid durable. Can be increased. In order to mold a resin mold body in which a solenoid assembly is incorporated, a molten resin material is injected into the mold under the state where the solenoid assembly is disposed inside the cavity of the mold for resin molding. Is done. As a result, the resin material covers the magnetic frame, the resin material is filled in the gap between the magnetic frame and the coil, the resin mold body is molded, and the solenoid assembly is solidified by the resin mold.

  Thus, in order to manufacture the solenoid by resin molding, it is necessary to arrange the solenoid assembly at a predetermined position of the mold. If the solenoid assembly is displaced in the mold during the injection of molten resin, the solenoid assembly is displaced inside the resin mold body, and the thickness of the coating portion of the resin mold body is partially reduced, or the magnetic frame May be exposed on the surface of the covering portion, or the power supply terminal may not have a predetermined protruding length. When the solenoid assembly is displaced in the mold in this way, the solenoid assembly is displaced inside the resin mold body, and it becomes impossible to efficiently manufacture a high-quality solenoid and lower the manufacturing yield. I will let you.

  An object of the present invention is to enable efficient production of high quality solenoids.

  The solenoid of the present invention has a bobbin in which an iron core is incorporated on the inside and a coil is wound on the outside, a magnetic frame in which the bobbin is incorporated, a magnetic frame that covers the magnetic frame, and is filled between the coil and the magnetic frame. A solenoid having a resin mold body, wherein a spacer having an exposed surface abutting against an inner surface of a mold for molding the resin mold body is fixed to the magnetic frame, and a screw hole is opened on the exposed surface to form the spacer. And the spacer sets the thickness of the resin mold body when the resin mold body is molded, and the connecting member is connected to the spacer by a screw member screwed into the screw hole when the solenoid is used. And

  The solenoid of the present invention has a bobbin in which an iron core is incorporated on the inside and a coil is wound on the outside, a magnetic frame in which the bobbin is incorporated, a magnetic frame that covers the magnetic frame, and is filled between the coil and the magnetic frame. A solenoid having a resin mold body, wherein a spacer having an exposed surface abutting against an inner surface of a mold for molding the resin mold body is fixed to the magnetic frame, and a screw hole is opened on the exposed surface to form the spacer. The printed circuit board provided with a wiring pattern to which two power supply terminals are attached and electrically connected to each of the power supply terminals is fixed to the magnetic frame by the spacer, and both ends of the coil are respectively The spacer is electrically connected to each of the power supply terminals via the wiring pattern. The thickness of the resin mold body and the embedding amount of the base end portion of the power supply terminal are set when the resin mold body is molded, and the connecting member is connected to the spacer by a screw member screwed into the screw hole when the solenoid is used. It is characterized by.

  The solenoid according to the present invention is characterized in that a ground terminal provided with a contact piece in contact with the magnetic frame is attached to the printed circuit board by the spacer. In the present invention, the connecting member is attached with a power supply cable electrically connected to the power supply terminal and a ground cable electrically connected to the ground terminal, and the screw member passes therethrough. It is a connector in which a through hole is formed.

  According to the present invention, the magnetic frame that constitutes the solenoid assembly together with the bobbin is provided with the spacer having the exposed surface that contacts the inner surface of the mold, so that the resin mold is molded integrally with the solenoid assembly. When positioning and positioning the solenoid assembly on a resin molding die, it is possible to position the solenoid assembly in the die with high accuracy using a spacer, and to produce a high-quality solenoid with high yield It can be manufactured efficiently. Since the exposed surface of the spacer is exposed on the surface of the resin mold body, and the screw hole is formed in the spacer, the connecting member attached to the solenoid can be attached using the screw hole.

  According to the present invention, since the printed circuit board to which the power supply terminal is attached can be fixed to the magnetic frame by the spacer, positioning at the time of molding the resin mold body with a small number of parts and attachment of the printed circuit board to the magnetic frame can be performed. It can be carried out. Furthermore, the ground terminal can be attached to the printed circuit board using a spacer.

  For the solenoid, a connector connected to the power supply terminal can be attached as a connecting member, and the attachment can be performed by fastening the screw member to the screw hole formed in the spacer using the spacer.

  By assembling a fixed iron core provided with a valve body to the solenoid, the solenoid can be used as a component of the electromagnetic valve.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a perspective view showing a solenoid valve having a solenoid according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB in FIG. 4 is an enlarged cross-sectional view of the solenoid shown in FIG. 2, and FIG. 5 is a side view of the solenoid seen from the direction of arrow C in FIG.

  The electromagnetic valve 10 shown in FIGS. 1 and 2 has a flow path block 11 and a solenoid 12 attached thereto. The flow path block 11 is formed of a substantially rectangular parallelepiped metal material. As shown in FIG. 3, the flow path block 11 is formed with a primary side port 13 and a secondary side port 14 coaxially in the longitudinal direction. ing. The primary side port 13 is communicated with the central portion of the valve chamber 15 via the communication hole 16, and the secondary side port 14 is communicated with the outer peripheral portion of the valve chamber 15 via the communication hole 17.

  As shown in FIG. 2, a fixed iron core 18 is incorporated in the solenoid 12, and the fixed iron core 18 is fastened to the solenoid 12 by a nut 19 that is screwed to a base end portion thereof. A non-magnetic stainless steel guide tube 18a is fixed to the fixed iron core 18, and a movable iron core 20 is incorporated in the guide tube 18a coaxially with the fixed iron core 18 so as to be movable in the axial direction. A compression coil spring 21 is incorporated between the iron core 18 and the movable iron core 20. A poppet type valve body 23 that contacts a valve seat 22 formed in the flow path block 11 is attached to the tip of the movable iron core 20, and the valve body 23 is arranged according to the distance that the valve body 23 moves away from the valve seat 22. The opening degree is set, the pressure and flow rate of fluid such as compressed air flowing from the primary side port 13 to the secondary side port 14 are adjusted, and when the valve body 23 comes into contact with the valve seat 22, the fluid flow is interrupted.

  The solenoid 12 is formed by a solenoid assembly 24 and a resin mold body 25. 6A is a plan view of the solenoid assembly 24, FIG. 6B is a front view of the solenoid assembly 24, and FIG. 6C is a side view of the solenoid assembly 24.

  As shown in FIGS. 4 and 6, the solenoid assembly 24 has a bobbin 26 made of a non-magnetic material such as resin, and the bobbin 26 is integrated with the cylindrical portion 26a and both ends thereof as shown in FIG. A mounting hole 27 into which the fixed iron core 18 and the movable iron core 20 are incorporated is provided inside the bobbin 26, and a coil 28 is wound around the outside of the bobbin 26. The bobbin 26 is incorporated in a magnetic frame 29, and the magnetic frame 29 has a front wall 29a, a back wall 29b, and upper and lower end walls 29c and 29d by bending an iron plate into a quadrilateral shape. It is a quadrilateral. The bobbin 26 is incorporated in the magnetic frame 29 with its flange 26b in contact with the inner surface of the end wall 29c and the flange 26c in contact with the inner surface of the end wall 29d. The bobbin 26 is fixed to the magnetic frame 29 by a magnetic ring 32 fitted into a through hole 31 formed in the end walls 29c and 29d.

  On the front wall 29a of the magnetic frame 29, as shown in FIG. 6, a printed circuit board 34 to which two power supply terminals 33a and 33b are fixed is disposed. Both ends 28a and 28b of the coil 28 are connected to the printed circuit board 34. The printed circuit board 34 is used to electrically connect the both ends 28a and 28b to the power supply terminals 33a and 33b. A wiring pattern is provided. A ground terminal 35 bent in an L shape is disposed on the surface of the printed circuit board 34, and an engaging piece 35a is provided on the ground terminal 35. The engaging piece 35a is provided with a magnetic frame 29 as shown in FIG. It engages with the engagement hole 36 formed in the, and prevents rotation of the ground terminal 35 when screwing.

  The printed circuit board 34 and the ground terminal 35 are fixed to the magnetic frame 29 by spacers 37 that are screw members. As shown in FIG. 4, a male screw portion 37 a that is fastened to a screw hole formed in the magnetic frame 29 is provided at the base end portion of the spacer 37, and the screw hole 39 that opens to the exposed surface 38 at the tip is a tip of the spacer 37. It is formed in the part. As shown in FIG. 4, the exposed surface 38 of the spacer 37 has a projecting dimension L from the front wall 29 a of the magnetic frame 29.

  The solenoid assembly 24 incorporates the bobbin 26 around which the coil 28 is wound into the magnetic frame 29, fastens the printed circuit board 34 and the ground terminal 35 to the magnetic frame 29 by the spacer 37, and further, both end portions 28a of the coil 28. 28b are soldered to the wiring pattern of the printed circuit board 34. The solenoid assembly 24 and the resin mold body 25 as shown in FIGS. 4 and 5 are formed by arranging the assembled solenoid assembly 24 in the mold and molding the resin mold body 25 in this manner. 12 is manufactured. When the resin mold body 25 is molded, the exposed surface 38 of the spacer 37 abuts on the inner surface of the mold, and the thickness of the portion of the resin mold body 25 that covers the front wall 29 a is set by the spacer 37.

  The solenoid valve 10 is a proportional control solenoid valve for controlling the flow rate and pressure of air pressure flowing from the primary side port 13 to the secondary side port 14 in accordance with the opening degree of the valve body 23, and is supplied to the coil 28. By adjusting the electric power, the valve body 23 is controlled to an arbitrary position between a fully closed position in contact with the valve seat 22 and a fully open position separated from the valve seat 22 by a predetermined distance.

  FIG. 7 is a cross-sectional view showing a mold 40 for molding the resin mold body 25, and FIG. 8 is a cross-sectional view taken along the line DD in FIG.

  The resin molding die 40 has a lower die 41 and an upper die 42 that can move up and down in the vertical direction. As shown in FIG. 8, the lower die 41 moves in the horizontal direction in FIG. Two slide molds 43 and 44 are arranged freely. By abutting these four molds 41 to 44, a recess corresponding to the outer shape of the solenoid 12, that is, a cavity 45 is formed inside the mold 40, and the resin mold is formed into a shape corresponding to the inner surface of the mold forming the cavity 45. The outer surface of the body 25 is formed. As shown in FIG. 7, the lower mold 41 is provided with a column portion 46 that fits into the mounting hole 27 of the bobbin 26, and the solenoid assembly 24 is positioned at a predetermined position in the cavity 45. Under the positioned state, as shown in FIG. 8, the power supply terminals 33a and 33b are sandwiched between the lower mold 41 and the slide molds 43 and 44, and the ground terminal 35 is sandwiched between the lower mold 41 and the upper mold 42. As shown in FIG. 7, the exposed surface 38 of the spacer 37 contacts the inner surface of the lower mold 41.

  When the solenoid assembly 24 is positioned in the mold 40 as described above, when molten resin is injected from the runner gate 47 as shown in FIG. The magnetic frame 29 is filled with a gap and the outer surface of the magnetic frame 29 is covered with a predetermined thickness. The gate 47 is provided on the mold 40 so as to face the back wall 29b of the magnetic frame 29. Since the molten resin jet injected into the cavity 45 hits the back wall 29b, the solenoid assembly 24 has a spacer 37. The molten resin jet force is applied in the direction in which the exposed surface 38 is pressed against the inner surface of the mold 40, and molten resin is prevented from entering between the exposed surface 38 and the inner surface of the mold 40. Therefore, after the resin mold body 25 is molded, a step of removing a part of the resin mold body 25 in order to expose the exposed surface 38 becomes unnecessary. In addition, the thickness of the resin mold body 25 that covers the front wall 29 a is a thickness that accurately corresponds to the protruding dimension L of the spacer 37.

  When the solenoid 12 including the solenoid assembly 24 and the resin mold body 25 is removed from the mold 40 after the molding of the resin mold body 25 is finished, the manufacture of the solenoid 12 shown in FIGS. 4 and 5 is finished. The fixed iron core 18 is fastened to the solenoid 12 with a nut, and the movable iron core 20 is mounted in the guide tube 18a fixed to the fixed iron core 18, and then the solenoid 12 is assembled to the flow path block 11 to obtain FIGS. Is produced. In order to assemble the solenoid 12 to the flow path block 11, as shown in FIG. 2, the fastening plate 49 is placed so that the fixing ring 48 fitted to the tip of the guide tube 18 a is sandwiched between the flow path block 11. It fixes to the flow path block 11 with the screw member which is not shown in figure.

  As shown in FIG. 1, power supply terminals 33a, 33b and a ground terminal 35 protrude from the front of the solenoid 12, and a connector 51 as a connecting member is a rubber seal member at these terminals 33a, 33b, 35. 52 to be mounted. The connector 51 is provided with power supply cables 53a, 53b and a ground cable 54. When the terminals 33a, 33b, 35 are inserted into the recesses provided in the connector 51, the terminals 33a, 33b, 35 are connected to the cable 53a. , 53b, and 54, respectively. In order to fasten the connector 51 to the solenoid 12, a through hole 55 is formed in the connector 51, and a screw member 56 screwed into a screw hole 39 formed in the spacer 37 passes through the through hole 55. It is like that.

  Therefore, the spacer 37 is a member for attaching the connector 51 as the connecting member to the solenoid 12 by screwing the screw member 56 to the screw hole 39 when the solenoid 51 is used, that is, when the connector 51 is attached to the solenoid 12. The spacer 37 functions as a member for positioning the solenoid assembly 24 in the mold 40 and setting the thickness of the resin mold body 25 when the resin mold body 25 of the solenoid 12 is molded. Thus, the molding accuracy of the resin mold body 25 can be increased by the spacer 37 as a member for attaching the connector 51, and a high-quality solenoid can be efficiently manufactured.

  Further, as shown in FIG. 4, the spacer 37 functions as a screw member for attaching the printed circuit board 34 and the ground terminal 35 to the magnetic frame 29 by screwing the male screw portion 37 a to the magnetic frame 29. Thus, the printed circuit board 34 and the ground terminal 35 can be attached and the solenoid assembly 24 can be positioned in the mold during molding with a small number of parts.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, although the illustrated solenoid 12 is mounted on a proportional control solenoid valve 10 for a pneumatic circuit, the solenoid 12 can be applied to other types of solenoid valves such as a directional control valve. It can also be applied to valves. As a type of the valve body in the electromagnetic valve, the present invention can be applied to an electromagnetic valve of a spool type or a slide type in addition to the poppet type. Further, the solenoid of the present invention is not limited to the solenoid for the solenoid valve as long as it has the solenoid assembly 24 and the resin mold body 25, and the present invention is also applied to a solenoid having only a fixed iron core. Can do.

It is a perspective view which shows the solenoid valve which has a solenoid of one embodiment of this invention. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. FIG. 3 is an enlarged sectional view of the solenoid shown in FIG. 2. It is a side view of the solenoid seen from the arrow C direction in FIG. (A) is a plan view of the solenoid assembly, (B) is a front view of the solenoid assembly, and (C) is a side view of the solenoid assembly. It is sectional drawing which shows the metal mold | die for shape | molding a resin mold body. It is the DD sectional view taken on the line in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Solenoid valve 11 Flow path block 12 Solenoid 13 Primary side port 14 Secondary side port 15 Valve chamber 16, 17 Communication hole 18 Fixed iron core 18a Guide tube 20 Movable iron core 21 Compression coil spring 22 Valve seat 23 Valve body 24 Solenoid assembly 25 Resin mold body 26 Bobbin 27 Mounting hole 28 Coil 29 Magnetic frame 31 Through hole 32 Magnetic rings 33a, 33b Power supply terminal 34 Printed circuit board 35 Ground terminal 36 Engagement hole 37 Spacer 38 Exposed surface 40 Mold 45 Cavity 47 Runner 51 Connector (connection) Element)
53a, 53b Feed cable 54 Ground cable

Claims (4)

A bobbin in which an iron core is incorporated inside and a coil is wound outside, a magnetic frame in which the bobbin is incorporated, and a resin mold that covers the magnetic frame and is filled between the coil and the magnetic frame A solenoid,
Fixing a spacer having an exposed surface in contact with the inner surface of a mold for molding the resin mold body to the magnetic frame;
A screw hole is formed in the spacer by opening the exposed surface;
The solenoid sets the thickness of the resin mold body when the resin mold body is molded, and connects the connecting member to the spacer by a screw member screwed into the screw hole when the solenoid is used. A bobbin in which an iron core is incorporated inside and a coil is wound outside, a magnetic frame in which the bobbin is incorporated, and a resin mold that covers the magnetic frame and is filled between the coil and the magnetic frame A solenoid,
Fixing a spacer having an exposed surface in contact with the inner surface of a mold for molding the resin mold body to the magnetic frame;
A screw hole is formed in the spacer by opening the exposed surface;
A printed circuit board on which two power supply terminals are attached and a wiring pattern electrically connected to each of the power supply terminals is fixed to the magnetic frame by the spacer, and both end portions of the coil are respectively connected to the wiring pattern. Electrically connected to each of the feeding terminals via
The spacer sets a thickness of the resin mold body and an embedding amount of the base end portion of the power supply terminal when the resin mold body is molded, and is connected to the spacer by a screw member screwed into the screw hole when the solenoid is used. A solenoid characterized by connecting the two.   3. The solenoid according to claim 2, wherein a ground terminal provided with a contact piece that contacts the magnetic frame is attached to the printed board by the spacer.   4. The solenoid according to claim 3, wherein the connection member is attached with a power supply cable electrically connected to the power supply terminal and a ground cable electrically connected to the ground terminal, and the screw member penetrates. A solenoid having a through hole formed therein.

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