Solenoid coil assembly, method of manufacturing same, and kit

Abstract

A solenoid coil assembly, a method of manufacturing the same, and a kit are disclosed. A solenoid coil assembly according to one embodiment may include: a bobbin including a bobbin body having a hollow cylindrical shape, on which a coil is wound, and a socket provided on an upper surface of the bobbin body, at which a lead of the coil is positioned; a bobbin housing including a socket through hole through which the socket is exposed to the outside, the bobbin housing surrounding the bobbin; and a pin housing integrally formed with the lead pin connected to the socket, coupled to the bobbin housing, and configured to electrically connect the lead of the coil to the lead pin.

Description

Technical Field

[0001] The present disclosure relates to a solenoid coil assembly and a method of manufacturing the same, and more particularly, to a solenoid coil assembly and a method of manufacturing a solenoid coil assembly that can improve productivity by preventing deformation or damage of a lead pin or a socket due to a force applied in the axial direction of a bobbin during the manufacturing process to connect the lead pin to the socket and omitting a process and components for electrical connection of a lead of the lead pin and the coil, wherein the lead of the coil is positioned at the socket. Background Art

[0002] Generally, various types of braking systems for obtaining braking force have been proposed for vehicles. Braking systems for vehicles include an anti-lock braking system (ABS), an electronic hydraulic brake (EHB), and an electronic stability control system (ESC) that prevent vehicle skidding.

[0003] Such braking systems for vehicles include a plurality of solenoid valves for controlling braking hydraulic pressure toward wheel brakes and an electronic control unit (ECU) for controlling the solenoid valves. Each solenoid valve includes: a solenoid coil assembly around which a coil is wound to form a magnetic field when power is applied; and a valve assembly that opens or closes an internal flow path through an electromagnetic field formed in the solenoid coil assembly.

[0004] Meanwhile, as Figure 1 and Figure 2 shown, a typical solenoid coil assembly includes: a hollow cylindrical bobbin 10 around which a coil 11 is wound in a circumferential direction, and a socket 12 is provided at the top; a bobbin housing 20 that includes a lower housing 21 and an upper housing 22 to surround the bobbin 10; and a lead pin 30 that is connected to the socket 12 in the axial direction of the bobbin 10.

[0005] In a typical solenoid coil assembly, since there is no component (except for the socket 12) for supporting the lead pin 30 in the axial direction of the bobbin 10 when the lead pin 30 is pressed in the axial direction of the bobbin 10 to be connected to the socket 12, the socket 12 or the lead pin 30 may be easily deformed or damaged.

[0006] In addition, in a typical solenoid coil assembly, when the lead pin 30 is pressed in the axial direction of the bobbin 10 to be connected to the socket 12, the socket 12 or the lead pin 30 may be damaged due to over-insertion of the lead pin 30, or poor connection may occur due to insufficient insertion of the lead pin 30. To prevent such damage or poor connection, a process of setting and adjusting an appropriate insertion height of the lead pin 30 from the socket 12 is required, which reduces productivity.

[0007] In addition, a typical solenoid coil assembly also requires a component or process for connecting the lead pin 30 to the lead of the coil 11 after the lead pin 30 is inserted into the socket 12, which further reduces productivity. SUMMARY OF THE INVENTION

[0008] One aspect of the present disclosure is to provide a solenoid coil assembly and a method of manufacturing a solenoid coil assembly that can prevent deformation or damage of the lead pin or the socket due to excessive force applied in the axial direction of the bobbin when connecting between the lead pin and the socket where the lead of the coil is located.

[0009] Another aspect of the present disclosure is to provide a solenoid coil assembly and a method of manufacturing a solenoid coil assembly that can prevent deformation or damage of the socket or the lead pin due to an excessive insertion amount of the lead pin relative to the socket and a poor connection due to an insufficient insertion amount of the lead pin relative to the socket when connecting between the lead pin and the socket where the lead of the coil is located.

[0010] Another aspect of the present disclosure is to provide a solenoid coil assembly and a method of manufacturing a solenoid coil assembly that can omit the process of adjusting the appropriate height of the lead pin from the socket for stable connection between the lead pin and the socket where the lead of the coil is located.

[0011] Another aspect of the present disclosure is to provide a solenoid coil assembly and a method of manufacturing a solenoid coil assembly that can omit the component and process for connecting the lead pin to the lead of the coil in a state where the lead pin is connected to the socket where the lead of the coil is located.

[0012] Other aspects of the present disclosure will be set forth in part in the following description, and in part will be obvious from the description, or may be learned by practice of the present disclosure.

[0013] According to an embodiment of the present disclosure, a solenoid coil assembly may be provided, the solenoid coil assembly including: a bobbin including a bobbin body having a hollow cylindrical shape and a socket, wherein a coil is wound around the bobbin body, the socket being provided on an upper surface of the bobbin body, wherein leads of the coil are positioned at the socket; a bobbin housing including a socket through-hole through which the socket is exposed to the outside, the bobbin housing surrounding the bobbin; and a pin housing integrally formed with a lead pin connected to the socket, coupled to the bobbin housing, and configured to electrically connect the leads of the coil to the lead pin.

[0014] The bobbin may further include: a lower flange disposed in the lower part of the bobbin body and configured to limit the lower winding range of the coil; and an upper flange disposed in the upper part of the bobbin body and configured to limit the upper winding range of the coil, wherein a socket is disposed on one side of the upper surface of the upper flange, and an indicator is formed on the other side of the upper surface of the upper flange.

[0015] The upper flange may further include a lead through hole disposed adjacent to the socket such that the lead of the coil is positioned at the socket.

[0016] The bobbin housing may further include: a lower housing disposed on the lower surface of the bobbin; and an upper housing coupled to the lower housing and surrounding the upper surface and the side surface of the bobbin, wherein a socket through hole is disposed on one side of the upper part of the upper housing, and an indicator through hole is disposed on the other side of the upper part of the upper housing, and the indicator is exposed to the outside through the indicator through hole.

[0017] The upper housing may further include an inner circumferential extension portion that is bent toward the inner circumferential surface of the bobbin and surrounds the upper part of the inner circumferential surface of the bobbin.

[0018] The pin housing may surround the upper surface and the side surface of the upper housing and include a coupling hook that is coupled to a first coupling portion disposed at the lower end of the upper housing.

[0019] The pin housing may further include coupling hook slits disposed on both sides of the coupling hook and extending in the axial direction of the pin housing.

[0020] The first coupling portion may be provided in the shape of a groove that is recessed in the axial direction of the bobbin housing at the lower end of the upper housing.

[0021] The pin housing may surround the upper surface of the upper housing and the upper part of the side surface of the upper housing and include a coupling groove that is coupled to a second coupling portion disposed at the upper end of the side surface of the upper housing.

[0022] The second coupling portion may be provided in the shape of a circular ring that extends in the circumferential direction at the upper end of the side surface of the upper housing.

[0023] The second coupling portion may be provided in the shape of a protrusion that protrudes in the diameter direction from the upper end of the side surface of the upper housing.

[0024] The upper housing may further include at least one support protrusion that supports the inner surface of the upper part of the pin housing.

[0025] The pin housing may include an indicator coupling hole that houses the upper end of the indicator.

[0026] The pin housing may further include a press-fit rib that projects from an inner circumferential surface of the indicator coupling hole toward the center of the indicator coupling hole, extends in the axial direction of the pin housing, and is configured to fix the upper end of the indicator.

[0027] The lead pin may include: a plug portion provided on one side of the upper part of the pin housing and electrically connected to a lead of a coil positioned at a socket; a connector portion that projects upward from the center of the upper part of the pin housing; and a connection portion positioned within the upper part of the pin housing and connecting the plug portion to the connector portion, wherein the lead pin is integrated into the pin housing by insert injection.

[0028] The upper end of the plug portion may project upward from the pin housing, and the plug portion may include a coil coupling hole provided at the lower end of the plug portion and electrically connected to the lead of the coil.

[0029] The connector portion may include: a connector pin that projects upward from the pin housing at the upper end of the connector portion, wherein the lower end of the connector pin projects from the lower surface of the upper part of the pin housing; and a limiting projection that projects from both sides of the connector pin at the lower end of the connector pin.

[0030] The socket may include: a first socket where a first lead of the coil is positioned; and a second socket where a second lead of the coil is positioned.

[0031] The lead pin may include: a first lead pin, at least a part of which is inserted into the first socket and electrically connected to the first lead; and a second lead pin, at least a part of which is inserted into the second socket and electrically connected to the second lead.

[0032] According to an embodiment of the present disclosure, a method of manufacturing a solenoid coil assembly can be provided. The solenoid coil assembly includes: a bobbin, which includes an indicator and a socket disposed on an upper surface of the bobbin, and the bobbin is in the shape of a hollow cylinder; a bobbin housing, which includes an indicator through-hole and a socket through-hole formed in an upper portion of the bobbin housing, and the bobbin housing surrounds the bobbin; and a pin housing, which is integrally formed with a lead pin, includes an indicator coupling hole, and surrounds at least a portion of the bobbin housing. The method includes the following steps: a coil winding operation of winding a coil around the bobbin such that a lead is positioned at the socket; a bobbin housing coupling operation of coupling the bobbin housing to the bobbin such that the socket and the indicator are respectively exposed through the socket through-hole and the indicator through-hole; and a pin housing coupling operation of coupling the pin housing to the bobbin housing such that a lower end of the lead pin is inserted into the socket, and an upper end of the indicator is received in the indicator coupling hole to electrically connect the lead of the coil to the lead pin. Description of the Drawings

[0033] These and / or other aspects of the present disclosure will become apparent and be more readily understood from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0034] Figure 1 is a perspective view showing a disassembled state of a typical solenoid coil assembly;

[0035] Figure 2 is a front view showing an assembled state of a typical solenoid coil assembly;

[0036] Figure 3 is a perspective view showing a disassembled state of a solenoid coil assembly according to an embodiment of the present disclosure;

[0037] Figure 4 is a perspective view showing an assembled state of a solenoid coil assembly according to an embodiment of the present disclosure;

[0038] Figure 5 is a top view showing an assembled state of a solenoid coil assembly according to an embodiment of the present disclosure;

[0039] Figure 6 is along Figure 5 sectional view taken along line A - A';

[0040] Figure 7 is along Figure 5 sectional view taken along line B - B';

[0041] Figure 8 is along Figure 5 sectional view taken along line C - C';

[0042] Figure 9 is a cross-sectional view showing an embodiment of a cross-section taken along line A - A' of Figure 5 ; and

[0043] Figure 10 is a cross-sectional view showing an embodiment of a cross-section taken along line B - B' of Figure 5 . DETAILED DESCRIPTION

[0044] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The following embodiments are provided to fully convey the concept of the present disclosure to those of ordinary skill in the art to which the present disclosure pertains. However, the present disclosure is not limited to these embodiments and may be implemented in another form. In the drawings, parts irrelevant to the description may not be shown in order to clarify the present disclosure, and for ease of understanding, the dimensions of the components are shown more or less exaggerated.

[0045] Figure 3 and Figure 4 are perspective views respectively showing a disassembled state and an assembled state of a solenoid coil assembly according to an embodiment of the present disclosure. In addition, Figure 5 is a top view showing an assembled state of a solenoid coil assembly according to an embodiment of the present disclosure. In addition, Figure 6 is a cross-sectional view taken along line A - A' of Figure 5 , Figure 7 is a cross-sectional view taken along line B - B' of Figure 5 , and Figure 8 is a cross-sectional view taken along line C - C' of Figure 5 . In addition, Figure 9 is a cross-sectional view showing an embodiment of a cross-section taken along line A - A' of Figure 5 , and Figure 10 is a cross-sectional view showing an embodiment of a cross-section taken along line B - B' of Figure 5 .

[0046] Referring to Figures 3 to 10 , a solenoid coil assembly according to an embodiment of the present disclosure may include a bobbin 100 around which a coil 111 is wound, a bobbin housing 200 surrounding the bobbin 100, and a pin housing 300. A lead pin 310 is integrated into the pin housing 300, and the pin housing 300 is coupled to the bobbin housing 200 to cover at least a part of the upper portion of the bobbin housing 200.

[0047] The bobbin 100 may include a hollow cylindrical bobbin body 110, a lower flange 120 disposed in the lower portion of the bobbin body 110 and having a circular ring plate shape, and an upper flange 130 disposed in the upper portion of the bobbin body 110 and having a circular ring plate shape.

[0048] As described above, the bobbin body 110 may be formed in the shape of a hollow cylinder, in which a sleeve (not shown) of the valve assembly and the like are positioned on the inner circumferential surface of the bobbin body 110, and the coil 111 is wound around the outer circumferential surface of the bobbin body 110 in the circumferential direction. Both ends of the coil 111 wound around the bobbin body 110 may be positioned on the upper portion of the bobbin body 110. Further, the bobbin body 110 may be made of a synthetic resin as an insulating material so as not to affect the magnetic field generated when current is supplied to the wound coil 111.

[0049] As Figure 3 and Figure 6 shown, the lower flange 120 may be integrated into the bobbin body 110 in the lower portion of the bobbin body 110, or the lower flange 120 may be provided as a separate component and connected to the lower portion of the bobbin body 110 through a structure such as a hook or a groove (not shown).

[0050] The lower flange 120 may limit the lower winding range of the coil 111 wound around the bobbin body 110, and the lower flange 120 may be made of a synthetic resin as an insulating material, similar to the bobbin body 110. The circular hole formed in the interior of the lower flange 120 may have the same cross-sectional area as the circular hole formed in the interior of the bobbin body 110.

[0051] As Figure 3 and Figure 6 shown, the upper flange 130 may be integrated into the bobbin body 110 in the upper portion of the bobbin body 110, or the upper flange 130 may be provided as a separate component and connected to the upper portion of the bobbin body 110 through a structure such as a hook or a groove (not shown).

[0052] The upper flange 130 may limit the upper winding range of the coil 111 wound around the bobbin body 110, and the upper flange 130 may be made of a synthetic resin as an insulating material, similar to the bobbin body 110. The circular hole formed in the interior of the upper flange 130 may have the same cross-sectional area as the circular hole formed in the interior of the bobbin body 110.

[0053] Therefore, the bobbin 100 may be manufactured as an injection molded product in which the bobbin body 110, the lower flange 120, and the upper flange 130 are integrated. Alternatively, by connecting the bobbin body 110, the lower flange 120, and the upper flange 130 provided as separate components to each other, the bobbin 100 may be formed in the shape of a hollow cylinder provided with annular flanges at the lower end and the upper end.

[0054] Meanwhile, the upper flange 130 may include a socket 131 disposed on one side of the upper surface of the upper flange 130, a lead through hole 132 adjacent to the socket 131, and an indicator 133 disposed on the other side of the upper surface.

[0055] The socket 131 may be an insulation displacement connection (IDC) type socket, which is formed in the shape of two ribs spaced apart from each other by a predetermined distance and parallel to each other. Here, the IDC may refer to an electrical connection structure that can simplify the product manufacturing process because the process or components for fixing the leads of the coil 111 to the lead pins 310, such as bolts or nuts, are omitted.

[0056] To this end, the upper end of the socket 131 may be chamfered so that the plug head 311, which will be described below, can be easily inserted between the two ribs. In addition, the socket 131 may be integrally molded with the upper flange 130 and include a conductive film formed by deposition or the like at the portion in contact with the plug head 311.

[0057] Moreover, the socket 131 may be provided as a first socket 131a and a second socket 131b adjacent to the first socket 131a, as Figure 3 shown. More specifically, as Figure 5 shown, the first socket 131a may be symmetric to the second socket 131b with respect to an imaginary line passing through the axis of the bobbin 100 in the diameter direction of the bobbin 100.

[0058] The lead through hole 132 may penetrate the upper flange 130 from the outer peripheral surface of the bobbin body 110 so that the ends of the coil 111 wound around the bobbin body 110 are positioned at the socket 131 configured as described above. Moreover, as described above, since the socket 131 is provided as the first socket 131a and the second socket 131b, two lead through holes 132 may be provided in a manner adjacent to the first socket 131a and the second socket 131b, respectively. In this case, the two lead through holes 132 may also be symmetric to each other with respect to an imaginary line passing through the axis of the bobbin 100 in the diameter direction of the bobbin 100.

[0059] Therefore, the first lead 111a and the second lead 111b, which are the two ends of the coil 111 wound around the bobbin body 110, may extend in the axial direction of the bobbin body 110 and be positioned at the first socket 131a and the second socket 131b via the lead through holes 132, respectively, as Figure 3 、 Figure 7 and Figure 8 shown. In addition, one end of the first lead 111a and one end of the second lead 111b may be respectively disposed between the first socket 131a and the second socket 131b.

[0060] In addition, the first lead 111a and the second lead 111b can be firmly fixed to the first socket 131a and the second socket 131b, respectively, to prevent detachment from the first socket 131a and the second socket 131b under the action of a force applied in the axial direction of the bobbin 100 while being connected to the lead pins 310, respectively.

[0061] The indicator 133 can be used to visually check the completion of the assembly of the solenoid coil assembly according to the present disclosure. The indicator 133 can be in the shape of a multi-sided cylinder including a cylinder and protrude upward from the upper surface of the upper flange 130. In this case, the indicator 133 can be positioned on the opposite side of the side where the socket 131 is positioned on the upper flange 130, as Figure 5 shown.

[0062] In addition, the axis of the indicator 133 can be positioned on an imaginary line passing through the axis of the bobbin 100 in the diameter direction of the bobbin 100. Further, after the solenoid coil assembly according to the present disclosure is fully assembled, the height by which the indicator 133 protrudes from the upper surface of the upper flange 130 can be equal to or similar to the height of the upper surface of the pin housing 300. Moreover, the indicator 133 can be manufactured as an injection molded product integral with the upper flange 130, such as the socket 131.

[0063] Meanwhile, the bobbin housing 200 can include a lower housing 210 in the shape of an annular plate and an upper housing 220 coupled to the lower housing 210 and surrounding the bobbin 100.

[0064] As Figure 6 shown, the cross-sectional area of the circular hole formed inside the lower housing 210 can be equal to or similar to the cross-sectional area of the cylindrical hole formed inside the bobbin body 110. Further, although not shown, the lower housing 210 can also include a structure for coupling to the upper housing 220, such as a groove or a hook.

[0065] Moreover, the outer diameter of the lower housing 210 can be equal to or similar to the inner diameter of the upper housing 220 such that the lower housing 210 is inserted into the upper housing 220 and coupled to the upper housing 220. In addition, the lower housing 210 can be made of a synthetic resin as an insulating material so as not to affect the magnetic field generated when current is supplied to the winding coil 111 (such as the bobbin 100).

[0066] The upper housing 220 may include a socket through-hole 221 and an indicator through-hole 222. The socket through-hole 221 may penetrate the upper portion of the upper housing 220 to expose the socket 131 to the outside in a state where the bobbin housing 200 is coupled to the bobbin 100 in a manner surrounding the bobbin 100. The socket through-hole 221 may be positioned such that the lead through-hole 132 is not exposed to the outside of the bobbin housing 200, thereby maximizing the prevention of foreign substances from entering the coil 111 wound around the bobbin body 110.

[0067] In addition, the indicator through-hole 222 may penetrate the upper portion of the upper housing 220 to expose the indicator 133 to the outside in a state where the bobbin housing 200 is coupled to the bobbin 100 in a manner surrounding the bobbin 100. Accordingly, the socket 131 and the indicator 133 may be exposed upward from the bobbin housing 200 that is completely assembled with the bobbin 100.

[0068] Moreover, the upper housing 220 may include an inner circumferential extension portion 223 that bends from the upper surface toward the cylindrical hole provided inside the bobbin 100 and surrounds the upper portion of the inner circumferential surface of the bobbin 100, as Figure 3 and Figure 6 shown. The inner circumferential extension portion 223 may firmly fix the bobbin housing 200 to the bobbin 100 and be in close contact with the inner circumferential surface of the bobbin 100. In addition, the inner circumferential extension portion 223 may further include a structure for fixing a sleeve or the like of the valve assembly, which is positioned on the inner circumferential surface of the bobbin body 110 as described above and is not shown.

[0069] In addition, the upper housing 220 may further include a first coupling portion 224 located at the lower end for fixing the pin housing 300 to the bobbin housing 200, wherein the first coupling portion 224 may be in the shape of a groove recessed in the axial direction of the bobbin housing 200, as Figure 3 、 Figure 7 and Figure 8 shown. In this case, at least two first coupling portions 224 may be provided to firmly fix the pin housing 300 to the bobbin housing 200.

[0070] Moreover, the upper housing 220 may include a second coupling portion 225 at the upper portion, wherein the second coupling portion 225 may be in the shape of a protrusion, as Figure 10 shown. In this case, the pin housing 300 may only surround the upper portion of the side surface of the bobbin housing 200 and not the entire side surface of the cylindrical bobbin housing 200. In addition, the pin housing 300 may include a structure in the shape of a groove at a position corresponding to the second coupling portion 225 to firmly couple the pin housing 300 to the upper housing 220.

[0071] Moreover, at least two second coupling parts 225 may be provided to firmly fix the pin housing 300 to the bobbin case 200, like the first coupling part 224. Alternatively, the second coupling parts 225 may extend along the outer peripheral surface of the upper case 220 in the circumferential direction to form an annular shape.

[0072] Moreover, the upper case 220 may further include at least two support protrusions 226 protruding upward from the upper surface, as Figure 9 shown. Here, when the pin housing 300 is coupled to the upper case 220 to cover the upper case 220 from above, the support protrusions 226 may support the inner surface of the upper part of the pin housing 300, thereby maintaining a gap between the upper surface of the bobbin case 200 and the inner surface of the upper part of the pin housing 300. Accordingly, the solenoid coil assembly according to the present disclosure can further prevent the lead pins 310 from being over-inserted into the socket 131 when the pin housing 300 is axially coupled to the bobbin case 200.

[0073] Moreover, the upper case 220 may be made of synthetic resin as an insulating material so as not to affect the magnetic field generated when current is supplied to the winding coil 111, like the lower case 210. Moreover, when the bobbin 100 is accommodated in the inner space of the bobbin case 200, the upper case 220 of the bobbin case 200 may be coupled to the lower case 210 of the bobbin case 200 through various known coupling structures (not shown). In this case, the first socket 131a and the first lead 111a positioned at the first socket 131a, the second socket 131b and the second lead 111b positioned at the second socket 131b, and the indicator 133 may be exposed to the outside from the bobbin case 200 that is completely assembled with the bobbin 100.

[0074] Meanwhile, the pin housing 300 may be closed at the entire upper part, have side portions in a hollow cylindrical shape, include lead pins 310 inserted into the upper part, and be coupled to the bobbin case 200 in a manner of surrounding the bobbin case 200 from above. The upper part of the pin housing 300 is shown as a quadrilateral. However, the upper part of the pin housing 300 is not limited to a quadrilateral and may be provided in various shapes including a circle.

[0075] As Figures 3 to 9 shown, the upper part of the pin housing 300 may cover the entire upper surface of the bobbin case 200, and the side portions of the pin housing 300 in a hollow cylindrical shape may surround the entire side surface of the bobbin case 200.

[0076] The pin housing 300 may include coupling hooks 330 located at the lower ends of the sides. The coupling hooks 330 may be coupled to the first coupling portions 224 provided at the lower ends of the upper housing 220 to couple the pin housing 300 to the bobbin housing 200. In addition, the coupling hooks 330 may include coupling hook slits 331 on both sides, and the coupling hook slits 331 may extend in the axial direction of the pin housing 300 such that the coupling hooks 330 can be deformed in the diameter direction of the pin housing 300 while moving downward along the side surface of the upper housing 220 in the axial direction of the bobbin housing 200.

[0077] Therefore, when the pin housing 300 is coupled to the bobbin housing 200, the coupling hooks 330 may move along the side surface of the bobbin housing 200 in a state of being opened in the diameter direction of the pin housing 300, and when the coupling hooks 330 reach the first coupling portions 224, the coupling hooks 330 may be restored and fixed to the first coupling portions 224. Moreover, at least two coupling hooks 330 may be provided to firmly fix the pin housing 300 to the bobbin housing 200 like the first coupling portions 224.

[0078] Moreover, the first coupling portions 224 may be in the shape of hooks protruding from the side surface of the bobbin housing 200, and the pin housing 300 may include a structure of coupling holes or coupling grooves instead of the coupling hooks 330 to couple the pin housing 300 to the bobbin housing 200 (not shown).

[0079] Meanwhile, since, in the process of coupling the pin housing 300 to the bobbin housing 200, the coupling hooks 330 configured as described above move in the axial direction of the bobbin housing 200 while being in close contact with the side surface of the bobbin housing 200, the side surface of the bobbin housing 200 may be damaged.

[0080] To prevent damage to the side surface of the bobbin housing 200, the upper part of the pin housing 300 may cover the entire upper surface of the bobbin housing 200, and the side part of the hollow cylindrical pin housing 300 may surround the upper part of the side surface of the bobbin housing 200, as Figure 10 shown.

[0081] In this case, the pin housing 300 may include a coupling groove 340 provided in the inner circumferential surface of the pin housing 300, and the second coupling portions 225 provided in a protruding or ring shape at the upper end of the upper housing 220 are inserted into the coupling groove 340.

[0082] Therefore, the solenoid coil assembly according to the present disclosure can fundamentally prevent damage that may occur on the side surface of the bobbin housing 200 when the pin housing 300 is coupled to the bobbin housing 200. In addition, since the side portion of the hollow cylindrical pin housing 300 surrounds the upper portion of the side surface of the bobbin housing 200, heat generated when current is supplied to the coil 111 can be relatively easily discharged to the outside, which further improves the heat dissipation effect.

[0083] Meanwhile, the pin housing 300 can be made of synthetic resin as an insulating material so as not to affect the magnetic field generated by the coil 111 wound around the bobbin body 110 (such as the bobbin 100 and the bobbin housing 200), and the lead pin 310 made of a metal material as a conductor can be integrated into the pin housing 300 through an insert injection process.

[0084] As Figure 7 and Figure 8 shown, the lead pin 310 may include a plug portion 311 provided at the upper portion of the socket 131, a connector portion 312 provided at the central portion of the upper portion of the pin housing 300, and a connection portion 313 connecting the plug portion 311 to the connector portion 312.

[0085] When the pin housing 300 is coupled to the bobbin housing 200 in the axial direction of the pin housing 300, the lower end of the plug portion 311 can be inserted into the socket 131 to be electrically connected to the first lead 111a or the second lead 111b. For this purpose, the plug portion 311 can be positioned at one side of the upper portion of the pin housing 300 in the axial direction of the pin housing 300 such that the socket 131 is positioned at the lower portion of the plug portion 311.

[0086] In addition, as Figure 8 shown, the plug portion 311 may include a coil coupling hole 311a in the shape of a hole, and the first lead 111a or the second lead 111b entering the plug portion 311 through a slit opening downward is fixed to the coil coupling hole 311a.

[0087] Therefore, in the solenoid coil assembly according to the present disclosure, when the pin housing 300 is assembled with the bobbin housing 200, the first lead 111a and the second lead 111b of the coil 111 can be electrically connected to the lead pin 310. Therefore, the process or component for connecting the lead of the coil to the lead pin in the process of manufacturing a typical solenoid coil assembly can be omitted, which greatly improves the productivity.

[0088] Moreover, the upper end of the insertion head portion 311 can protrude from the upper surface of the pin housing 300 to facilitate the manufacture of the mold during the insertion and injection of the lead pins 310 and the pin housing 300, and to firmly fix the lead pins 310 to the pin housing 300.

[0089] Moreover, as described above, since the upper end of the insertion head portion 311 protrudes from the upper surface of the pin housing 300, it is possible to visually inspect whether the insertion head portion 311 is correctly placed in the pin housing 300 during the manufacture of the solenoid coil assembly according to the present disclosure.

[0090] The connector portion 312 may include connector pins 312a that protrude upward from the pin housing 300 to be electrically connected to a printed circuit board (PCB) or the like provided in a device for a vehicle (hereinafter referred to as a vehicle control device), such as an antilock braking system (ABS), an electronic hydraulic brake (EHB), and an electronic stability control system (ESC), in which the solenoid coil assembly according to the present disclosure is installed.

[0091] In addition, the connector portion 312 may be disposed at the central portion of the upper part of the pin housing 300 in the axial direction of the pin housing 300. Moreover, as Figure 7 shown, the connector portion 312 may further include restricting protrusions 312b that protrude from both sides of the connector pins 312a at the lower end of the connector pins 312a to prevent the connector pins 312a from being overly inserted into the PCB or the like.

[0092] Therefore, the force applied to the connector pins 312a in the axial direction of the pin housing 300 to electrically connect the solenoid coil assembly according to the present disclosure to the PCB of the vehicle control device can be transmitted to the insertion head portion 311 via the pin housing 300 without being directly transmitted to the insertion head portion 311, which further prevents deformation or damage of the lead pins 310 and the socket 131.

[0093] Moreover, the lower end of the connector portion 312 can protrude from the lower surface of the upper part of the pin housing 300 to firmly fix the lead pins 310 to the pin housing 300, as Figure 9 shown. The lower end of the connector pins 312a can be spaced apart from the upper surface of the bobbin housing 200 to prevent interference with a sleeve (not shown) or the like of a valve assembly positioned on the inner peripheral surface of the bobbin body 110.

[0094] In addition, the solenoid coil assembly according to the present disclosure may include a member or structure for directly supporting the lower end of the connector portion 312 on the inner peripheral surface of the bobbin main body 110, so as to further prevent the lead pins 310 from being deformed or damaged due to the force applied in the axial direction of the pin housing 300 when the lead pins 310 are electrically connected to the first lead 111a and the second lead 111b of the coil 111, the PCB, etc.

[0095] As Figure 8 shown, as described above, the connecting portion 313 may connect the plug portion 311 provided at the socket 131 to the connector portion 312 provided at the central portion of the pin housing 300 inside the pin housing 300. In addition, as Figure 9 shown, one end of the connecting portion 313 may protrude to one side of the plug portion 311 in the diameter direction of the pin housing 300, and the other end of the connecting portion 313 may protrude to one side of the connector portion 312 in the diameter direction of the pin housing 300, so as to firmly fix the lead pins 310 to the pin housing 300.

[0096] Moreover, the lead pins 310 configured as described above may include a first lead pin 310a and a second lead pin 310b adjacent to each other to be respectively coupled to the first socket 131a and the second socket 131b, as Figure 3 shown. More specifically, similar to the first socket 131a and the second socket 131b, the first lead pin 310a may be symmetric to the second lead pin 310b with respect to an imaginary line passing through the axis of the pin housing 300 in the diameter direction of the pin housing 300.

[0097] In addition, each of the first lead pin 310a and the second lead pin 310b may include all of the plug portion 311, the connector portion 312, and the connecting portion 313 to form the same shape as described above.

[0098] Meanwhile, the pin housing 300 may include an indicator coupling hole 320 provided in the upper portion of the pin housing 300 and coupled to the indicator 133, and a coupling hook 330 or a coupling groove 340 coupled to the bobbin housing 200.

[0099] The indicator coupling hole 320 may penetrate the upper portion of the pin housing 300 such that the upper end of the indicator 133 provided on the upper flange 130 and exposed upward from the bobbin housing 200 through the indicator through hole 222 is coupled to the indicator coupling hole 320, as Figure 3 and Figure 7 shown. In addition, the indicator coupling hole 320 may include at least two press-fit ribs 321 protruding from the indicator coupling hole 320 in the axial direction of the pin housing 300, as Figure 5As shown. Thus, when the upper end of the indicator 133 is inserted into the indicator coupling hole 320, the press-fit rib 321 can be press-fitted into the outer circumferential surface of the indicator 133, thereby firmly fixing the indicator 133 within the indicator coupling hole 320.

[0100] Accordingly, the solenoid coil assembly according to the present disclosure can prevent deformation and damage of the socket 131 or the lead pin 310 caused by over-insertion of the insertion head 311 of the lead pin 310 into the socket 131 provided on the bobbin 100, and prevent poor connection caused by insufficient insertion of the insertion head 311 of the lead pin 310 into the socket 131 provided on the bobbin 100, thereby improving the reliability of the product and further reducing the error rate.

[0101] Meanwhile, the method of manufacturing the solenoid coil assembly according to the present disclosure may include a coil winding operation, a bobbin housing coupling operation, and a pin housing coupling operation.

[0102] The coil winding operation may be a process of winding the coil 111 in the circumferential direction of the bobbin body 110. The winding range of the coil 111 may be limited by the lower flange 120 in the lower direction and by the upper flange 130 in the upper direction.

[0103] More specifically, the bobbin body 110 may be in the shape of a hollow cylinder, where a valve assembly or the like may be positioned on the inner circumferential surface of the bobbin body 110, and the coil 111 may be wound around the outer circumferential surface of the bobbin body 110 in the circumferential direction of the bobbin body 110.

[0104] The lower flange 120 may limit the lower winding range of the coil 111 wound around the bobbin body 110. The lower flange 120 may be integrated into the bobbin body 110 in the lower part of the bobbin body 110. Alternatively, the lower flange 120 may be provided as a separate component and coupled to the lower part of the bobbin body 110 through a structure such as a hook or a groove (not shown). Moreover, the circular hole formed inside the lower flange 120 may have the same cross-sectional area as the circular hole formed inside the bobbin body 110.

[0105] The upper flange 130 may limit the upper winding range of the coil 111 wound around the bobbin body 110. The upper flange 130 may be integrated into the bobbin body 110 in the upper part of the bobbin body 110. Alternatively, the upper flange 130 may be provided as a separate component and coupled to the upper part of the bobbin body 110 through a structure such as a hook or a groove (not shown). Moreover, the circular hole formed inside the upper flange 130 may have the same cross-sectional area as the circular hole formed inside the bobbin body 110.

[0106] Therefore, by manufacturing the bobbin body 110, the lower flange 120, and the upper flange 130 as an integrally injection-molded product, or by preparing the bobbin body 110, the lower flange 120, and the upper flange 130 as separate components and then coupling the bobbin body 110, the lower flange 120, and the upper flange 130 to each other, the bobbin 100 can be set in the shape of a hollow cylinder having flanges each in the shape of a circular ring at the lower end and the upper end.

[0107] In addition, in the coil winding operation, the first lead 111a of the coil 111 can be positioned at the first socket 131a provided in the shape of two ribs parallel to each other via a lead through-hole 132 adjacent to the first socket 131a and provided in the upper flange 130. In addition, the second lead 111b of the coil 111 can be positioned at the second socket 131b provided in the shape of two ribs parallel to each other via a lead through-hole 132 adjacent to the second socket 131b and provided in the upper flange 130.

[0108] More specifically, as Figure 5 shown, the first socket 131a can be symmetric to the second socket 131b with respect to an imaginary line passing through the axis of the bobbin 100 in the diameter direction of the bobbin 100.

[0109] Moreover, as described above, since the socket 131 is provided as the first socket 131a and the second socket 131b, two lead through-holes 132 can be provided to be adjacent to the first socket 131a and the second socket 131b, respectively. In this case, the two lead through-holes 132 can also be symmetric to each other with respect to an imaginary line passing through the axis of the bobbin 100 in the diameter direction of the bobbin 100.

[0110] Therefore, the first lead 111a and the second lead 111b, which are the two ends of the coil 111 wound around the bobbin body 110, can extend in the axial direction of the bobbin body 110, pass through the lead through-hole 132, and then be respectively positioned at the first socket 131a and the second socket 131b, as Figure 3 、 Figure 7 and Figure 8 shown. In addition, one end of the first lead 111a and one end of the second lead 111b can be respectively provided between the first socket 131a and the second socket 131b.

[0111] Meanwhile, the bobbin housing coupling operation can be an operation of coupling the lower housing 210 and the upper housing 220 after the bobbin 100 with the coil 111 wound thereon is accommodated in the internal space of the bobbin housing 200.

[0112] More specifically, in the operation of coupling the bobbin case, the bobbin 100 can be received in the internal space of the bobbin case 200 by aligning the lower case 210 below the bobbin 100, aligning the upper case 220 above the bobbin 100, and then moving the lower case 210 or the upper case 220 in the axial direction of the bobbin 100 to couple the lower case 210 with the upper case 220. The upper case 220 and the bobbin 100 can be aligned based on an indicator 133 provided on the upper surface of the bobbin 100 and an indicator through-hole 222 provided in the upper part of the upper case 220.

[0113] Moreover, the inner diameter of the upper case 220 can be equal to or similar to the outer diameters of the lower flange 120 and the upper flange 130. Thus, after the bobbin 100 is stably received in the internal space of the upper case 220, the lower case 210 can be coupled with the upper case 220. The first socket 131a and the second socket 131b provided on the upper surface of the bobbin 100 can be exposed to the outside through socket through-holes 221 provided in the upper part of the upper case 220.

[0114] That is, after the operation of coupling the bobbin case as described above is completed, the first socket 131a, the first lead 111a positioned at the first socket 131a, the second socket 131b, the second lead 111b positioned at the second socket 131b, and the indicator 133 can be exposed to the outside from the bobbin case 200.

[0115] In addition, in order to couple the lower case 210 with the upper case 220, the outer diameter of the lower case 210 can be equal to or similar to the inner diameter of the upper case 220 such that the lower case 210 is inserted into the upper case 220 and coupled with the upper case 220. In addition, a coupling structure such as a hook or a groove can be provided on the outer peripheral surface of the lower case 210, and a coupling structure such as a groove or a hook can be provided on the inner peripheral surface of the lower end of the upper case 220 to couple the upper case 220 with the lower case 210.

[0116] In addition, the outer peripheral diameter of the lower case 210 can be equal to or similar to the outer peripheral diameter of the upper case 220 such that the lower end of the upper case 220 rests on the upper surface of the lower case 210 (not shown). In this case, on the lower end of the upper case 220, a coupling structure such as a hook protruding in the axial direction of the upper case 220 can be provided, and the lower case 210 can include a coupling structure such as a hole on the surface on which the lower end of the upper case 220 rests to couple the upper case 220 with the lower case 210.

[0117] Meanwhile, the pin housing coupling operation can be an operation of coupling the pin housing 300 with the bobbin case 200 such that the pin housing 300 surrounds at least a part of the fully assembled bobbin case 200 as described above.

[0118] More specifically, in the pin housing coupling operation, the pin housing 300 can surround at least a portion of the bobbin housing 200 by aligning the pin housing 300 above the bobbin housing 200 and moving the bobbin housing 200 or the pin housing 300 in the axial direction of the bobbin housing 200 to couple the bobbin housing 200 with the pin housing 300.

[0119] At this time, the bobbin housing 200 and the pin housing 300 can be aligned based on the indicator 133 exposed upward from the bobbin housing 200 and the indicator coupling hole 320 provided in the upper portion of the pin housing 300.

[0120] In addition, the inner peripheral diameter of the side portion of the pin housing 300 having a hollow cylindrical shape can be equal to or similar to the outer peripheral diameter of the side portion of the bobbin housing 200. Thus, the bobbin housing 200 can be coupled with the pin housing 300 such that the entire upper surface of the bobbin housing 200 and the entire or part of the side surface of the bobbin housing 200 are surrounded by the pin housing 300.

[0121] Meanwhile, as described above, the upper portion of the pin housing 300 can cover the entire upper surface of the bobbin housing 200, and the side portion of the hollow cylindrical pin housing 300 can surround the entire side surface of the bobbin housing 200. In this case, the pin housing 300 can include a coupling hook 330 at the lower end of the side portion. As described above, the coupling hook 330 can be coupled to the first coupling portion 224 provided at the lower end of the upper housing 220 to couple the pin housing 300 with the bobbin housing 200. Moreover, the coupling hook 330 can include a coupling hook slit 331 formed on both sides of the coupling hook 330 and extending in the axial direction of the pin housing 300, such that the coupling hook 330 can be deformed in the diametrical direction of the pin housing 300 while moving downward in the axial direction of the bobbin housing 220 along the side surface of the upper housing 220.

[0122] Therefore, when the pin housing 300 is coupled with the bobbin housing 200, the coupling hook 330 can move along the side surface of the bobbin housing 200 in a state of being opened in the diametrical direction of the pin housing 300, and when the coupling hook 330 reaches the first coupling portion 224, the coupling hook 330 can be restored and fixed to the first coupling portion 224. Moreover, at least two coupling hooks 330 can be provided to firmly fix the pin housing 300 to the bobbin housing 200 as with the first coupling portion 224.

[0123] Moreover, the first coupling portion 224 can be in the shape of a hook protruding from the side surface of the bobbin housing 200, and the pin housing 300 can include a structure of a coupling hole or a coupling groove instead of the coupling hook 330 to couple the pin housing 300 with the bobbin housing 200 (not shown).

[0124] Meanwhile, since, during the process of coupling the pin housing 300 to the bobbin housing 200, the coupling hook 330 as described above moves in the axial direction of the bobbin housing 200 while being in close contact with the side surface of the bobbin housing 200, the side surface of the bobbin housing 200 may be damaged.

[0125] Therefore, as Figure 10 shown, the upper portion of the pin housing 300 may cover the entire upper surface of the bobbin housing 200, and the side portion of the hollow cylindrical pin housing 300 may surround the upper portion of the side surface of the bobbin housing 200.

[0126] In this case, the pin housing 300 may include a coupling groove 340 provided in the inner circumferential surface of the pin housing 300, and as described above, the protrusion or the ring-shaped second coupling portion 225 provided at the upper end portion of the upper housing 220 is inserted into the coupling groove 340.

[0127] Therefore, the solenoid coil assembly according to the present disclosure can fundamentally prevent damage that may occur on the side surface of the bobbin housing 200 when the pin housing 300 is coupled to the bobbin housing 200.

[0128] Moreover, as described above, the upper housing 220 may further include at least two support protrusions 226 protruding upward on the upper surface to support the inner surface of the upper portion of the pin housing 300 during the pin housing coupling operation, thereby maintaining a gap between the upper surface of the bobbin housing 200 and the inner surface of the upper portion of the pin housing 300. Therefore, in the method of manufacturing the solenoid coil assembly according to the present disclosure, when the pin housing 300 is coupled to the bobbin housing 200 in the axial direction of the bobbin housing 200, the lead pin 310 can be further prevented from being overly inserted into the socket 131.

[0129] Moreover, as described above, during the pin housing coupling operation of coupling the pin housing 300 to the bobbin housing 200, the indicator 133 may be received in the indicator coupling hole 320 provided in the pin housing 300. At this time, the indicator 133 may be firmly fixed within the indicator coupling hole 320 by the press-fit ribs 321 that protrude from the inner circumferential surface of the indicator coupling hole 320 toward the center of the indicator coupling hole 320 and extend in the axial direction of the pin housing 300.

[0130] Moreover, as described above, during the pin housing coupling operation of coupling the pin housing 300 to the bobbin housing 200, the lead pin 310 integrated into the pin housing 300 may be electrically connected to the lead of the coil 111 positioned at the socket 131 without performing a separate connection process.

[0131] More specifically, as Figure 7 and Figure 8 shown, the lead pin 310 may include a plug portion 311 disposed at the upper part of the socket 131, a connector portion 312 disposed at the central part of the upper part of the pin housing 300, and a connection portion 313 connecting the plug portion 311 to the connector portion 312.

[0132] When the pin housing 300 is coupled to the bobbin housing 200 in the axial direction of the pin housing 300, the lower end of the plug portion 311 may be inserted into the socket 131 to be electrically connected to the first lead 111a or the second lead 111b, as described above. To this end, the plug portion 311 may be positioned on one side of the upper part of the pin housing 300 in the axial direction of the pin housing 300 such that the socket 131 is positioned at the lower part of the plug portion 311.

[0133] Moreover, as Figure 8 shown, the plug portion 311 may include a coil coupling hole 311a which is in the shape of a hole, and the first lead 111a or the second lead 111b passing through a slit opening downward is fixed to the coil coupling hole 311a.

[0134] Moreover, the upper end of the plug portion 311 may protrude from the upper surface of the pin housing 300 to facilitate the manufacture of a mold during the insertion injection of the lead pin 310 and the pin housing 300, and to firmly fix the lead pin 310 to the pin housing 300.

[0135] Moreover, as described above, since the upper end of the plug portion 311 protrudes from the upper surface of the pin housing 300, it is possible to visually check whether the plug portion 311 is correctly placed in the pin housing 300 during the manufacture of the solenoid coil assembly according to the present disclosure.

[0136] The connector portion 312 may include a connector pin 312a protruding upward from the pin housing 300 to be electrically connected to a PCB or the like in a vehicle control device in which the solenoid coil assembly according to the present disclosure is mounted.

[0137] In addition, the connector portion 312 may be disposed at the central part of the upper part of the pin housing 300 in the axial direction of the pin housing 300. Moreover, as Figure 7 shown, the connector portion 312 may further include restricting protrusions 312b protruding from both sides of the connector pin 312a at the lower end of the connector pin 312a to prevent the connector pin 312a from being excessively inserted into a PCB or the like. Moreover, the lower end of the connector portion 312 may protrude from the lower surface of the upper part of the pin housing 300 to firmly fix the lead pin 310 to the pin housing 300. As Figure 9As shown, the lower end of the connector pin 312a may be spaced apart from the upper surface of the bobbin housing 200 to prevent interference with a sleeve (not shown) of a valve assembly positioned on the inner circumferential surface of the bobbin body 110, etc.

[0138] As Figure 8 shown, as described above, the connecting portion 313 may connect the plug portion 311 provided at the socket 131 to the connector portion 312 provided at the central portion of the pin housing 300 inside the pin housing 300. Further, as Figure 9 shown, one end of the connecting portion 313 may protrude to one side of the plug portion 311 in the diametrical direction of the pin housing 300, and the other end of the connecting portion 313 may protrude to one side of the connector portion 312 in the diametrical direction of the pin housing 300 to firmly fix the lead pin 310 to the pin housing 300.

[0139] Moreover, the lead pin 310 configured as described above may include a first lead pin 310a and a second lead pin 310b adjacent to each other to be respectively coupled to the first socket 131a and the second socket 131b, as Figure 3 shown. More specifically, similar to the first socket 131a and the second socket 131b, the first lead pin 310a may be symmetrical to the second lead pin 310b with respect to an imaginary line passing through the axis of the pin housing 300 in the diametrical direction of the pin housing 300.

[0140] In addition, each of the first lead pin 310a and the second lead pin 310b may include all of the plug portion 311, the connector portion 312, and the connecting portion 313 to form the same shape as described above.

[0141] Therefore, since the first lead 111a and the second lead 111b are electrically connected to the first lead pin 310a and the second lead pin 310b respectively in the pin housing coupling operation, compared with the process of manufacturing a typical solenoid coil assembly, the method of manufacturing the solenoid coil assembly according to the present disclosure can greatly improve the productivity of the product by omitting the process and components for connecting the leads of the coil to the lead pins.

[0142] The solenoid coil assembly and its manufacturing method according to an embodiment can improve the reliability of the product and reduce the error rate by preventing the socket or the lead pins from being deformed or damaged due to an excessive force applied in the axial direction of the bobbin when coupling between the lead pins and the socket (where the leads of the coil are positioned).

[0143] According to an embodiment, a solenoid coil assembly and a manufacturing method thereof can further improve the reliability of the product and reduce the error rate by preventing deformation or damage of the socket or the lead pin due to excessive insertion amount of the lead pin relative to the socket (where the lead of the coil is positioned) when coupling between the lead pin and the socket, and preventing poor connection due to insufficient insertion amount of the lead pin relative to the socket.

[0144] According to an embodiment, a solenoid coil assembly and a manufacturing method thereof can simplify the manufacturing process of the product and improve the productivity by omitting the process of adjusting the appropriate height of the lead pin from the socket to stably couple between the lead pin and the socket (where the lead of the coil is positioned).

[0145] According to an embodiment, a solenoid coil assembly can further simplify the manufacturing process of the product and improve the productivity because the member and process for connecting the lead pin to the lead of the coil can be omitted in the state where the socket where the lead of the coil is located is coupled to the lead pin.

[0146] So far, embodiments of the solenoid coil assembly according to the present disclosure have been described in detail. However, it is obvious that various modifications can be made without departing from the scope of the present disclosure.

[0147] Therefore, the scope of the present disclosure should not be limited to the above embodiments, but should be defined by the appended claims and equivalents of the claims.

[0148] That is to say, it should be understood that the above embodiments are for illustrative purposes only and not for the purpose of limiting all aspects. The scope of the present disclosure is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning, scope and equivalent concepts of the claims should be included within the scope of the present disclosure.

Claims

1. A solenoid coil assembly, the solenoid coil assembly comprising: A bobbin, the bobbin including a hollow bobbin body, a coil wound around the bobbin body, and a socket provided on an upper surface of the bobbin body, wherein leads of the coil are positioned at the socket; A bobbin housing, the bobbin housing including a socket through-hole, the socket passing through the socket through-hole and being exposed to the outside, the bobbin housing surrounding the bobbin; and A pin housing, the pin housing being integrally formed with lead pins and coupled to the bobbin housing, wherein the lead pins are physically and electrically connected to the leads positioned at the socket.

2. The solenoid coil assembly according to claim 1, wherein, The bobbin further includes: A lower flange, the lower flange being provided in a lower portion of the bobbin body and configured to limit a lower winding range of the coil; and An upper flange, the upper flange being provided in an upper portion of the bobbin body and configured to limit an upper winding range of the coil, wherein the socket is provided on one side of an upper surface of the upper flange, and an indicator is formed on a side opposite to the upper surface of the upper flange.

3. The solenoid coil assembly according to claim 2, wherein, The upper flange further includes a lead through-hole provided adjacent to the socket, such that the leads of the coil are positioned at the socket.

4. The solenoid coil assembly according to claim 2, wherein, The bobbin housing further includes: A lower housing, the lower housing being provided on a lower surface of the bobbin; and An upper housing, the upper housing being coupled to the lower housing and surrounding an upper surface and a side surface of the bobbin, wherein the socket through-hole is provided on one side of an upper portion of the upper housing, and an indicator through-hole is provided on a side opposite to the upper portion of the upper housing, the indicator passing through the indicator through-hole and being exposed to the outside.

5. The solenoid coil assembly according to claim 4, wherein, The upper housing further includes an inner circumferential extension portion, the inner circumferential extension portion being bent toward an inner circumferential surface of the bobbin and surrounding an upper portion of the inner circumferential surface of the bobbin.

6. The solenoid coil assembly according to claim 4, wherein, The pin housing surrounds the upper surface and the side surface of the upper housing, and the pin housing includes a coupling hook, the coupling hook being coupled to a first coupling portion provided at a lower end of the upper housing.

7. The solenoid coil assembly according to claim 6, wherein, The pin housing further includes a coupling hook slit, the coupling hook slit being provided on both sides of the coupling hook and extending in an axial direction of the pin housing.

8. The solenoid coil assembly according to claim 4, wherein, The pin housing surrounds the upper surface of the upper housing and an upper end of the side surface of the upper housing, and the pin housing includes a coupling groove, the coupling groove being coupled to a second coupling portion provided at an upper end of the side surface of the upper housing.

9. The solenoid coil assembly according to claim 8, wherein, The second coupling portion is any one of the following: A ring, the ring extending in a circumferential direction at an upper end of the side surface of the upper housing; or A protrusion, the protrusion protruding in a diametrical direction from an upper end of the side surface of the upper housing.

10. The solenoid coil assembly according to claim 4, wherein, The upper housing further includes at least one support protrusion, the at least one support protrusion supporting an inner surface of an upper portion of the pin housing.

11. The solenoid coil assembly according to claim 4, wherein, The pin housing includes an indicator coupling hole for receiving an upper end of the indicator.

12. The solenoid coil assembly according to claim 11, wherein, The pin housing further includes a press-fit rib, the press-fit rib protruding inward from an inner circumferential surface of the indicator coupling hole, extending in an axial direction of the pin housing, and configured to fix an upper end of the indicator.

13. The solenoid coil assembly according to claim 1, wherein, The bobbin case further includes: an upper portion through which the socket through-hole is formed; and at least one support protrusion extending upward from the upper portion of the bobbin case and supporting the upper portion of the pin housing.

14. The solenoid coil assembly according to claim 1, wherein, The lead pin includes: a plug head portion provided at the upper portion of the pin housing and electrically connected to the lead of the coil positioned at the socket; a connector portion protruding upward from the upper portion of the pin housing; and a connection portion positioned inside the upper portion of the pin housing and connecting the plug head portion to the connector portion.

15. The solenoid coil assembly according to claim 14, wherein the upper end of the plug head portion protrudes upward from the pin housing, and the plug head portion includes a coil coupling hole provided at the lower end of the plug head portion, and the lead of the coil is received in the coil coupling hole to physically and electrically connect to the lead pin.

16. The solenoid coil assembly according to claim 14, wherein, The connector portion includes: a connector pin protruding upward from the pin housing at the upper end of the connector portion, wherein the lower end of the connector pin protrudes from the lower surface of the upper portion of the pin housing.

17. The solenoid coil assembly according to claim 1, wherein the socket includes: a first socket where the first lead of the coil is positioned; and a second socket where the second lead of the coil is positioned, and the lead pin includes: a first lead pin, at least a portion of which is inserted into the first socket and physically and electrically connected to the first lead; and a second lead pin, at least a portion of which is inserted into the second socket and physically and electrically connected to the second lead.

18. The solenoid coil assembly according to claim 1, wherein the bobbin further includes an indicator on the upper surface of the bobbin body, and the bobbin case further includes an indicator through-hole through which the indicator is exposed to the outside.

19. A method of manufacturing a solenoid coil assembly, the solenoid coil assembly including: a bobbin including a hollow bobbin body, a coil wound around the bobbin body, and an indicator and a socket provided on the upper surface of the bobbin body, wherein the leads of the coil are positioned at the socket; a bobbin case including an indicator through-hole and a socket through-hole formed in the upper portion of the bobbin case; and a pin housing integrated with a lead pin, the pin housing including an indicator coupling hole, the method comprising the steps of: a bobbin case coupling operation of coupling the bobbin case to the bobbin such that the bobbin case surrounds the bobbin, and the socket and the indicator are respectively exposed through the socket through-hole and the indicator through-hole; A pin housing coupling operation couples the pin housing to the bobbin housing such that the pin housing surrounds at least a portion of the bobbin housing, an upper end of the indicator is received in the indicator coupling hole, and a lower end of the lead pin is inserted into the socket and physically and electrically connected to the lead positioned at the socket.

20. A kit for a solenoid coil assembly, the kit for a solenoid coil assembly comprising: A bobbin including a hollow bobbin body, a coil wound around the bobbin body, and a socket provided on an upper surface of the bobbin body, wherein leads of the coil are positioned at the socket; A bobbin housing including a socket through-hole, wherein the bobbin housing is configured to surround the bobbin, and the socket through-hole is configured to expose the socket to the outside; and A pin housing integrally formed with a lead pin and configured to be coupled to the bobbin housing, wherein the lead pin is configured to physically and electrically connect to the lead of the coil positioned at the socket.

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