JP2017089763A - Solenoid valve and method of manufacturing solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce magnetic flux leakage by making a radial dimension of a solenoid valve small.SOLUTION: A solenoid part 15 comprises: a shield case 70 which is made of magnetic material and in a bottomed cylinder shape; a coil 40 which is wound around a bobbin 20 made of synthetic resin and accommodated in the shield case 70; terminal metal fittings 30 which have an L-shaped bent part 33 at an intermediate part and has one end side 31A connected to the coil 40 to be united with the bobbin 20; an opening part 77 which is provided at a bottom part 73 of the shield case 70 and into which the terminal metal fittings 30 has the part more on one side 31A than the bent part 33 inserted to have the bent part 33 located outside the shield case 70; and a connector housing 80 which is provided to cover the opening part 77 and then covers the part, located outside the shield case 70, of the terminal metal fittings 30, an inner dimension h1 of the opening part 77 in a direction in which the terminal metal fittings 30 extends from the bent part 33 to a tip being smaller than a dimension h2 from the bent part 33 of the terminal metal fittings 30 to the tip.SELECTED DRAWING: Figure 1

Description

  The technology disclosed in this specification relates to a solenoid valve and a method for manufacturing the solenoid valve.

  For example, in an automatic transmission of a vehicle, the hydraulic pressure is controlled using a solenoid valve (solenoid valve). As an electromagnetic valve for performing such hydraulic control or the like, one disclosed in JP-A-2015-94414 (Patent Document 1 below) is known. The solenoid portion of the solenoid valve is provided with a substantially cylindrical coil that generates a magnetic field when energized, and one end of the electric wire of the coil is connected to a connector provided on the bobbin. And the connector is provided on the cylindrical side surface (radial direction) of the cover of the magnetic body which covers a coil.

JP2015-94414A

  However, in the configuration disclosed in Japanese Patent Application Laid-Open No. 2015-94414 (Patent Document 1), since the connector is provided on the cylindrical side surface, the radial size of the solenoid portion increases. Moreover, in order to attach a connector, it is necessary to provide a large opening in the cover, and magnetic flux leakage from the coil increases.

  The solenoid valve disclosed in this specification is a solenoid valve including a valve portion and a solenoid portion, and the solenoid portion includes a shield case having a bottomed cylindrical shape made of a magnetic material, and a bobbin made of a synthetic resin. A coil housed in the shield case and having an L-shaped bent portion at an intermediate portion, one end of which is connected to the coil and integrated with the bobbin, and the shield Provided at the bottom of the case, provided to cover the opening, and an opening that allows the bent portion to be positioned outside the shield case by inserting a portion of the terminal metal fitting closer to the one end than the bent portion; A connector housing that covers a portion of the terminal metal fitting that is located outside the shield case, and the terminal metal fitting includes an inner portion of the opening in a direction extending from the bent portion to the tip. Act is smaller than the dimension from the bent portion of the terminal fitting to the tip.

  In such a solenoid valve, since the connector housing is provided at the bottom of the shield case, the radial dimension of the solenoid valve can be made smaller than that in which the connector housing is provided on the peripheral side surface of the shield case. In addition, since the inner dimension of the opening in the direction in which the terminal fitting extends from the bent portion to the distal end is smaller than the dimension from the bent portion to the distal end of the terminal fitting, the dimension from the L-shaped bent portion to the distal end portion is reduced. The opening area of the opening can be reduced as compared with the case where the opening is provided. Therefore, magnetic flux leakage from the opening can be reduced.

As an embodiment of the solenoid valve disclosed in the present specification, the following configuration may be adopted.
A terminal cover portion made of synthetic resin is provided on the one end side of the bent portion of the terminal metal fitting, and the terminal cover portion is inserted through the opening portion while being in close contact with a hole edge of the opening portion. Also good.

  In such a structure, since the base end side of the terminal metal fitting which penetrates an opening part is covered with the terminal cover part made from a synthetic resin, there is no possibility that a shield case and a terminal metal fitting may contact in an opening part. Moreover, since the terminal cover part is inserted in close contact with the hole edge of the opening part, the position of the terminal fitting in the opening part is fixed. For this reason, when the bent portion is bent backward in an L shape, there is no possibility that the terminal fitting and the hole edge of the opening are brought into contact by the bending force.

  Further, the terminal cover portion may be provided with a stepped surface that becomes larger on the bobbin side, and the stepped surface may be in contact with the inner surface of the bottom of the shield case.

  In such a configuration, the terminal fitting can be positioned with respect to the shield case by the stepped surface of the terminal cover portion coming into contact with the inner surface of the bottom portion of the shield case.

As a method for manufacturing the solenoid valve disclosed in the present specification, the following method may be used.
A straight terminal fitting part is fixed to the bobbin, the coil is wound around the bobbin and the coil is connected to the terminal fitting part, and the terminal fitting part is inserted into the opening of the shield case. After that, the terminal fitting having the bent portion may be formed by bending an intermediate portion of the terminal fitting component, and then the connector housing may be attached.

  In such a solenoid valve manufacturing method, the terminal fitting part fixed to the bobbin is inserted into the opening of the shield case before the bent portion is bent into an L shape to form the terminal fitting. Therefore, the inner dimension of the opening in the direction in which the terminal fitting extends from the bent portion to the tip can be made smaller than the size from the bent portion to the tip of the terminal fitting. That is, the opening area of the opening can be reduced as compared with the case where the terminal fitting bent in an L shape is passed through the opening. Therefore, magnetic flux leakage from the opening can be reduced.

  In addition, the tubular cover that covers the coil and the base end side of the terminal fitting part are covered with the coil wound around the bobbin and connected to the terminal fitting part provided on the bobbin. The terminal cover part may be molded and then the terminal cover part may be inserted through the opening of the shield case.

  In such a solenoid valve manufacturing method, since the base end side of the terminal fitting through which the opening is inserted is covered with the terminal covering portion molded before the terminal fitting is inserted into the opening, the terminal fitting is inserted. At this time, there is no possibility that the shield case and the terminal fitting come into contact with each other at the opening. Moreover, since the terminal cover part is inserted in close contact with the hole edge of the opening part, the position of the terminal fitting in the opening part is fixed. Therefore, there is no possibility that the terminal metal and the hole edge of the opening are brought into contact with each other by the bending force when the bent portion is bent backward in an L shape.

  According to the solenoid valve and the method for manufacturing the solenoid valve disclosed in the present specification, it is possible to reduce the size of the solenoid valve in the radial direction and reduce magnetic flux leakage.

Partially cutaway sectional view of a solenoid valve according to an embodiment Sectional view with the bobbin molded Sectional view with coil wound Cross-sectional view after secondary molding Sectional view with shield case assembled Sectional view before the connector housing is mounted with the terminal fitting bent in an L shape Sectional view with the connector housing attached

<Embodiment>
Embodiments will be described with reference to FIGS. 1 to 7.
The solenoid valve 10 of this embodiment is mounted on a hydraulic control device for an automatic transmission of a vehicle, and includes a valve unit 11 that performs oil path switching control and hydraulic control, and a solenoid unit 15 that drives the valve unit 11. Are combined. In the following description, the right side (valve part 11 side) in FIG. 1 is the front side, and the left side (connector housing 80 side) in FIG. 1 is the rear side. Moreover, the upper side in FIG. 1 will be referred to as the upper side, and the lower side in FIG. 1 (the side on which the terminal fittings 30 are disposed) will be described as the lower side.

  As shown in FIG. 1, the valve portion 11 includes a cylindrical valve body 11A and a disk-shaped disk portion 11B provided on the rear end side of the valve body 11A and extending radially outward. At least the disc part 11B is made of a magnetic metal. The inside of the valve main body 11A communicates with the inside of the solenoid unit 15 and is provided with a valve body that is displaced inside and controls the hydraulic pressure.

  As shown in FIG. 1, the solenoid unit 15 is provided inside the bobbin 20, a cylindrical bobbin 20, a terminal fitting 30 integrated with the bobbin 20, a coil 40 wound around the bobbin 20, and the bobbin 20. The core 45, the cylindrical cover 50 that covers the coil 40, the terminal cover 60 that covers the base end side of the terminal fitting 30, the shield case 70 that houses the coil 40, and the shield case 70 are attached to the rear. And a connector housing 80.

  The bobbin 20 is made of an insulating synthetic resin and has a cylindrical shape as shown in FIGS. 1 and 2. The bobbin 20 includes a hollow shaft portion 21 around which the coil 40 is wound, and a flange portion 23 provided at the front and rear ends of the shaft portion 21 by expanding the diameter of the shaft portion 21 outward. A terminal fixing portion 25 for fixing the terminal fitting 30 is provided at the lower end portion of the rear flange portion 23 so as to protrude rearward. The upper surface position of the terminal fixing portion 25 is flush with the inner surface position of the shaft portion 21. In the vicinity of the terminal fixing portion 25, a lead-out portion 27 is provided for pulling out a winding 41 of a coil 40 described later to the terminal fitting 30 side.

  The terminal fitting 30 is made of a conductive metal, and is formed by bending a linear terminal fitting part 31 formed by pressing into an L shape at an intermediate portion to provide a bent portion 33. As shown in FIGS. 1 and 2, the terminal fitting 30 is connected to the crimping portion 35 to which the winding 41 of the coil 40 is crimped, the embedded portion 37 embedded in the terminal covering portion 60, and the counterpart terminal. Part 39. The crimp part 35 is provided by protruding a U-shaped crimping piece on the outer side in the width direction of the terminal fitting 30. The connecting part 39 and the bent part 33 are in the shape of a square bar. Further, the base end side (the embedded portion 37 and the like) from the bent portion 33 has a flat plate shape wider than the connecting portion 39 and the bent portion 33. Then, one end side 31 </ b> A of the pair of terminal fitting parts 31 is insert-molded into the bobbin 20, so that the pair of terminal fitting parts 31 (terminal fittings 30) are integrated with the bobbin 20.

  As shown in FIGS. 1 and 3, the coil 40 is obtained by winding a number of windings 41 around the shaft portion 21 of the bobbin 20. Then, both end portions of the winding 41 are drawn out to the terminal fitting 30 side from the drawing portion 27 of the bobbin 20 and are crimped to the crimping portion 35 of the terminal fitting 30. The coil 40 generates a magnetic force when energized to form a magnetic flux loop that passes through the core portion 45 and the shield case 70. The core portion 45 is disposed in the hollow portion of the bobbin 20 and includes a fixed core and a movable core. The fixed core of the core portion 45 is magnetized by the magnetic force of the coil 40, and the movable core moves to displace the valve body in the valve body 11A.

  As shown in FIGS. 1 and 4, the cylindrical cover portion 50 is formed by molding the coil 40 together with the bobbin 20 with an insulating synthetic resin. The cylindrical cover portion 50 covers the bobbin 20 and the coil 40 and has a substantially cylindrical shape. Thus, by covering the coil 40 with the cylindrical cover part 50, the coil 40 and the shield case 70 are insulated.

  As shown in FIGS. 1 and 4, the terminal cover 60 covers the terminal fixing portion 25 of the bobbin 20, the crimping portion 35 of the terminal fitting 30 (terminal fitting component 31), and the embedded portion 37. A portion of the terminal cover 60 that covers the terminal fixing portion 25 and the crimping portion 35 has a semicircular shape in a cross-sectional view in which the upper surface is flat and has a circumferential shape along the outer peripheral shape of the cylindrical cover 50. A portion that is a circular portion 61 and covers the embedded portion 37 is a rectangular portion 63 having a substantially rectangular shape in sectional view along an opening shape of an opening portion 77 of a shield case 70 described later. Since the size of the rectangular portion 63 is smaller in both the width direction and the vertical direction than the semicircular portion 61, a step is provided between the semicircular portion 61 and the rectangular portion 63. A rear end surface of the semicircular portion 61 that is larger than the rectangular portion 63 is a step surface 65. The rectangular portion 63 is provided with a locked portion 67 for locking a locking portion 85 of the connector housing 80 described later.

  The shield case 70 is made of a magnetic metal that flows around the coil 40 and allows a magnetic flux to flow, and has a bottomed cylindrical shape as shown in FIGS. 1 and 5. The shield case 70 includes a substantially cylindrical cylindrical portion 71, a substantially circular bottom portion 73 provided at the rear end of the cylindrical portion 71, and a crimping portion 75 that is crimped to the disc portion 11 </ b> B of the valve portion 11. ing. The inner diameter of the cylindrical portion 71 is substantially the same as the outer diameter of the cylindrical covering portion 50. Further, when the inner surface of the bottom portion 73 is assembled to the coil 40, the shield case 70 is positioned with respect to the terminal cover portion 60 (terminal fitting 30) by coming into contact with the step surface 65.

  A substantially rectangular opening 77 through which the rectangular portion 63 and the terminal fitting part 31 can be inserted is provided below the bottom portion 73. The internal dimensions of the opening 77 in the width direction and the vertical direction are almost the same as the dimensions of the rectangular part 63 in the width direction and the vertical direction, and the rectangular part 63 is in close contact with the hole edge of the opening 77. . Further, the inner dimension h1 in the vertical direction of the opening 77 is smaller than the vertical dimension h2 of the connection part 39 of the terminal fitting 30 (the vertical dimension from the bent part 33 to the tip thereof).

  The connector housing 80 is made of synthetic resin, and covers the opening 77 while covering a portion of the terminal fitting 30 disposed outside the shield case 70 as shown in FIGS. 1 and 7. The connector housing 80 includes an assembly portion 81 that is assembled to the terminal cover portion 60 and a fitting portion 83 that engages with the mating connector. The assembly portion 81 has a substantially rectangular tube shape and is assembled so as to be fitted around the rectangular portion 63. The inner dimension of the assembly part 81 is substantially the same as the outer dimension of the rectangular part 63 and is fixed by being in close contact with the rectangular part 63. Further, the assembly portion 81 is provided with a locking portion 85, and this locking portion 85 is locked to the locked portion 67 of the rectangular portion 63. The fitting portion 83 is provided in a substantially vertical direction with respect to the assembling portion 81, and has a substantially rectangular tube shape that opens upward and communicates with the assembling portion 81. And the connection part 39 of the terminal metal fitting 30 is accommodated in the fitting part 83. FIG. Further, a part of the front wall of the fitting part 83 and a part of the upper wall of the assembly part 81 are communicated and opened to provide a terminal insertion part 87 through which the L-shaped terminal fitting 30 can be inserted. Yes.

The solenoid valve 10 of the present embodiment has the above-described structure, and is manufactured by the following procedure, for example.
First, as shown in FIG. 2, the bobbin 20 is primarily molded with a synthetic resin. Insert molding is performed so that one end side 31 </ b> A of the linear terminal fitting part 31 is embedded in the terminal fixing portion 25 of the bobbin 20. Then, as shown in FIG. 3, the coil 41 is formed by winding the winding 41 around the outer peripheral surface of the shaft portion 21 of the molded bobbin 20 by a predetermined number of turns. And the both ends of the coil | winding 41 of the coil 40 are each pulled out from the drawer | drawing-out part 27 of the bobbin 20 to the terminal metal fitting 30 side, and the coil | winding 41 is connected to the crimping | compression-bonding part 35 by fusing.

  Next, as shown in FIG. 4, the cylindrical cover portion 50 and the terminal cover portion 60 are integrally formed by secondary molding. The bobbin 20, the coil 40, and the terminal fitting part 31 are set in the mold. Then, by injecting molding resin, the cylindrical cover 50 is molded while simultaneously molding the terminal cover 60. By this secondary molding process, the crimping part 35 and the embedding part 37 of the terminal fitting part 31 (terminal fitting 30) are covered with the terminal covering part 60. The semicircular portion 61 of the terminal cover portion 60 is molded so as to be flush with the terminal fixing portion 25 and the cylindrical cover portion 50. On the other hand, the upper surface of the rectangular portion 63 is flush with the semicircular portion 61, but the lower surface of the rectangular portion 63 is not flush, and a step is formed between the semicircular portion 61 and the step surface 65 is formed. Yes.

  And the shield case 70 is assembled | attached as shown in FIG. The shield case 70 is assembled from the rear so that the opening 77 can be inserted into the terminal fitting part 31. At this time, since one end side 31A (base end side) of the intermediate portion of the terminal fitting part 31 is held by the terminal cover 60, the distal end position of the terminal fitting part 31 is stabilized, and the opening portion of the shield case 70 is opened. The terminal fitting part 31 is inserted into the terminal 77 without contacting. The rectangular portion 63 is inserted while being in close contact with the hole edge of the opening 77. Then, the shield case 70 is positioned by pushing the shield case 70 forward to a position where the step surface 65 corresponds to the inner surface of the bottom portion 73 and bringing it into contact with the step surface 65.

  After assembling the shield case 70 to the coil 40, as shown in FIG. 6, the bent portion 33 is formed by bending the terminal fitting part 31 into an L shape at the intermediate portion outside the shield case 70. 39 extends in the vertical direction. At this time, since the terminal fitting part 31 is covered with the terminal cover 60 and the rectangular portion 63 of the terminal cover 60 is in close contact with the opening 77 of the shield case 70, the terminal fitting in the opening 77 is used. The position of the component 31 (terminal fitting 30) is fixed. Therefore, there is no possibility that the terminal fitting part (terminal fitting 30) and the hole edge of the opening 77 come into contact with each other due to the bending force of the bent portion 33 in an L shape.

  After the terminal fitting 30 is formed, the connector housing 80 is attached as shown in FIGS. When the connector housing 80 is attached from the rear side of the terminal fitting 30, the connecting portion 39 is accommodated in the fitting portion 83 so that the connecting portion 39 of the terminal fitting 30 passes through the terminal insertion portion 87. Then, while the locking portion 85 is locked to the locked portion 67, the mounting portion 81 is externally fitted to the rectangular portion 63 and mounted. By fixing the connector housing 80 to the terminal cover 60 in this manner, the connector housing 80 covers the opening 77 and the portion of the terminal fitting 30 that is located outside the shield case 70.

  Finally, as shown in FIG. 1, the core portion 45 and the valve portion 11 are assembled. The core portion 45 is inserted into the hollow portion of the bobbin 20 from the front and fixed. And it inserts from the front of the shield case 70 so that the rear surface of the disc part 11B of the valve part 11 contacts the flange part 23 of the bobbin 20. When the disc portion 11B is arranged at a predetermined position, the valve portion 11 is fixed to the solenoid portion 15 by caulking the caulking portion 75 of the shield case 70 with respect to the disc portion 11B. The solenoid valve 10 is manufactured by such a procedure.

  As described above, in the solenoid valve 10 of the present embodiment, the connector housing 80 is attached to the rear of the bottom portion 73 of the shield case 70, so that the solenoid valve 10 is compared with the solenoid valve 10 provided with the connector housing on the peripheral side surface of the shield case 70. The dimension of the valve 10 in the radial direction (vertical direction) can be reduced. Moreover, since the fitting part 83 of the connector housing 80 is opened upward, fitting workability with the mating connector when a plurality of solenoid valves are arranged is improved. Further, the inner dimension of the opening 77 in the direction (vertical direction) in which the terminal fitting 30 extends from the bent portion 33 to the distal end than the dimension from the bent portion 33 to the distal end of the terminal fitting 30 (vertical dimension h2 of the connecting portion 39). Since h1 is made small, the opening area of the opening 77 can be made smaller than when an opening having a dimension from the L-shaped bent portion to the tip is provided. Therefore, magnetic flux leakage from the opening 77 can be reduced.

  Further, in the method of manufacturing the solenoid valve 10 according to the present embodiment, before the terminal fitting 30 is formed by bending the terminal fitting part 31 fixed to the bobbin 20 into the L shape at the bent portion 33, the opening of the shield case 70 is opened. 77 is inserted. Therefore, the inner dimension of the opening 77 in the direction (vertical direction) in which the terminal fitting 30 extends from the bent portion 33 to the tip than the size from the bent portion 33 to the tip of the terminal fitting 30 (vertical size h2 of the connecting portion 39). h1 can be reduced. That is, the opening area of the opening 77 can be reduced as compared with the case where a terminal fitting bent in an L shape is passed through the opening. Therefore, magnetic flux leakage from the opening 77 can be reduced.

<Other embodiments>
The technology disclosed in this specification is not limited to the embodiment described with reference to the above description and drawings, and for example, the following embodiments are also included in the technical scope.
(1) In the above embodiment, the terminal cover 60 is provided when the cylindrical cover 50 is provided, but the terminal cover 60 may not be provided.

  (2) In the above embodiment, the step surface 65 is formed on the terminal cover 60, but the step surface may be omitted.

  (3) In the above embodiment, the terminal fitting part 31 is fixed to the bobbin 20 by insert molding, but may be fixed by other methods such as press fitting.

DESCRIPTION OF SYMBOLS 10 ... Solenoid valve 11 ... Valve part 15 ... Solenoid part 20 ... Bobbin 30 ... Terminal metal fitting 31 ... Terminal metal fitting part 33 ... Bending part 39 ... Connection part 40 ... Coil 50 ... Cylindrical covering part 60 ... Terminal covering part 61 ... Semicircle Part 63 ... Rectangular part 65 ... Step surface 70 ... Shield case 71 ... Cylindrical part 73 ... Bottom part 77 ... Opening part 80 ... Connector housing h1 ... Inner dimension h2 in the vertical direction of the opening part ... Vertical dimension of the connecting part

Claims (5)

A solenoid valve having a valve portion and a solenoid portion,
The solenoid part is
A shield case with a bottomed cylindrical shape made of magnetic material;
A coil wound around a synthetic resin bobbin and housed in the shield case;
A terminal fitting having an L-shaped bent portion in an intermediate portion and having one end connected to the coil and integrated with the bobbin;
An opening that is provided at the bottom of the shield case and allows the bent portion to be positioned outside the shield case by inserting a portion on the one end side of the bent portion of the terminal fitting;
A connector housing that is provided so as to cover the opening, and covers a portion of the terminal fitting located outside the shield case;
A solenoid valve in which an inner dimension of the opening in a direction in which the terminal fitting extends from the bent portion to the tip is smaller than a size from the bent portion to the tip of the terminal fitting.   A terminal cover portion made of synthetic resin is provided on the one end side of the bent portion of the terminal fitting, and the terminal cover portion is inserted through the opening portion in close contact with a hole edge of the opening portion. The solenoid valve according to 1. The terminal cover portion is provided with a stepped surface on which the bobbin side becomes larger,
The solenoid valve according to claim 2, wherein the step surface is in contact with an inner surface of a bottom portion of the shield case. A method for manufacturing the solenoid valve according to any one of claims 1 to 3,
In a state where the linear terminal fitting part is fixed to the bobbin, the coil is wound around the bobbin and the coil is connected to the terminal fitting part.
After the terminal fitting part is inserted into the opening of the shield case, the terminal fitting having the bent portion is formed by bending an intermediate portion of the terminal fitting part, and then the connector housing is attached. Manufacturing method of solenoid valve.   The terminal cover covering the cylindrical cover portion covering the coil and the base end side of the terminal metal fitting part in a state where the coil is wound around the bobbin and the coil is connected to the terminal metal fitting part provided on the bobbin. The solenoid valve manufacturing method according to claim 4, wherein the terminal cover portion is inserted through the opening of the shield case.

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