Coil assembly, and mounting structure of coil assembly

Abstract

To provide a coil assembly capable of improving the strength thereof while reducing the load thereon by preventing vibration and the like of the coil assembly.SOLUTION: A coil assembly 10 includes: a coil 13 formed by winding a wire on a bobbin 11; a yoke 14 accommodating the coil 13; and a connection terminal 16 protruding to the outside of the yoke 14 and is electrically connected to a winding. The coil 13 and the yoke 14 are movable relative to the shaft direction, and In the yoke 14, between the bobbin 11 and the yoke 14, a biasing member 15 is provided to apply a pressing force to the yoke 14.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a coil assembly and a mounting structure for the coil assembly. [Background technology]

[0002] 2. Description of the Related Art Conventionally, in an electronic control device or the like incorporating a coil assembly, a technique is known in which a coil biasing member is disposed between the housing of the device and the coil assembly (see, for example, Patent Document 1). The coil biasing member of Patent Document 1 is provided in a brake fluid pressure control device mounted on a vehicle. The coil biasing member is disposed between a coil assembly disposed on one surface of a base and a wall of a housing, and biases the coil assembly toward the base. The coil assembly is connected to an electric component such as a wiring board in the housing via a connection terminal. The coil assembly is attached to the base in a state where it abuts against one surface of the base by the pressing force of the coil biasing member, with a solenoid valve provided on the base inserted inside.

[0003] The coil biasing member of Patent Document 1 can prevent vibration of the coil assembly caused by vibrations while the vehicle is running and contact between the coil assembly and the solenoid valve, thereby maintaining good electrical connection between the coil assembly and electrical components.

[0004] However, when the coil assembly is pre-assembled to the housing, if a coil biasing member is interposed between the coil assembly and the housing, there is a risk that the pressing force of the coil biasing member will act as a load on the connection terminals, etc. of the coil assembly until the housing is attached to the base.

[0005] As a measure to reduce the load caused by the pressing force of such a coil biasing member, a holding structure as shown in Figs. 5 and 6 has been considered. Fig. 5 is an explanatory diagram showing the state of the coil assembly 70 before the housing 50 is attached to the base body 60. Fig. 6 is an explanatory diagram showing the state of the coil assembly 70 after the housing 50 is attached to the base body 60.

[0006] 5, a recess 72 is provided on a side surface of a yoke 71 of coil assembly 70. Meanwhile, a wall portion 51 extending toward coil assembly 70 is provided on the lower surface of housing 50. An engagement portion 52 that engages with recess 72 is provided on the tip portion of wall portion 51.

[0007] According to this holding structure, before the housing 50 is attached to the base 60, the engaging portion 52 engages with the recess 72, thereby suppressing the load that the pressing force of the coil biasing member 80 imparts to the coil assembly 70. 6, when the housing 50 is attached to the base 60, the engagement of the engagement portion 52 with the recess 72 is released, and the coil assembly 70 can be pressed against the base 60 by the pressing force of the coil biasing member 80. This makes it possible to prevent vibration, etc. of the coil assembly 70. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2012-241846 A Summary of the Invention [Problem to be solved by the invention]

[0009] 5 and 6, however, it is necessary to form recesses 72 on the side surface of yoke 71 of coil assembly 70, which may cause magnetic loss in coil assembly 70 or thrust loss with respect to solenoid valve 61. In addition, there is also a problem in that dimensional control for forming recesses 72 and engagement portion 52 is complicated.

[0010] The present invention aims to solve the above-mentioned problems and to provide a coil assembly and a mounting structure for the coil assembly that can eliminate the load on the connection terminals while preventing vibration, etc. of the coil assembly and improve the strength of the mounting structure. [Means for solving the problem]

[0011] In order to solve the above problem, the coil assembly of the present invention is a coil assembly comprising a coil having a winding wound around a bobbin, a yoke that houses the coil, and a connection terminal that is electrically connected to the winding and protrudes outside the yoke, wherein the coil and the yoke are relatively movable in the axial direction, and a biasing member that applies a pressing force to the yoke is interposed between the bobbin and the yoke within the yoke.

[0012] In the coil assembly of the present invention, for example, the yoke can be pressed against the mounting surface of the base on which the coil assembly is mounted. This makes it possible to prevent the yoke from vibrating relative to the base when subjected to an external force. It also makes it possible to prevent contact between the yoke and, for example, an electromagnetic valve inserted through the yoke. In addition, since the pressing force caused by the return of the urging member can be received by the bobbin, the load caused by the pressing force of the urging member is not applied to the connection terminal. As a result, even if the connection terminal is connected to the housing and the coil assembly is assembled to the housing in advance, for example, in a stage prior to the mounting process of mounting the housing to the base body on which the coil assembly is mounted, the load caused by the return of the urging member is not applied to the connection terminal. In this way, according to the coil assembly of the present invention, it is possible to eliminate the load on the connection terminal while preventing vibrations of the coil assembly (yoke) by the biasing member. In other words, according to the coil assembly of the present invention, it is possible to improve the strength of the mounting structure.

[0013] The biasing member is preferably a disc spring. In this coil assembly, the biasing member can be suitably disposed within the yoke in the narrow space formed between the bobbin and the yoke.

[0014] It is preferable that the biasing member is interposed between the bobbin and the yoke on the axially opposite side to the side on which the connection terminal is provided.

[0015] In this coil assembly, the space for arranging the urging member can be easily secured, which results in excellent assembly properties of the urging member and productivity of the coil assembly.

[0016] In order to solve the above problem, the mounting structure for a coil assembly of the present invention comprises a base on which a solenoid valve is disposed, a coil assembly for driving the solenoid valve, and a housing to which the coil assembly is connected via a connection terminal. The coil assembly comprises a coil formed by winding a wire around a bobbin, a yoke for accommodating the coil, and a connection terminal electrically connected to the winding and protruding to the outside of the yoke. The coil and the yoke are relatively movable in the axial direction. A biasing member for applying a pressing force to the yoke is interposed between the bobbin and the yoke within the yoke. With the housing attached to the base, the biasing member presses the yoke against the mounting surface of the base.

[0017] In the mounting structure for the coil assembly of the present invention, the yoke can be pressed against the mounting surface of the base body. This makes it possible to prevent the yoke from vibrating relative to the base body when subjected to an external force. It also makes it possible to prevent contact between the solenoid valve and the yoke. In addition, since the pressing force caused by the return of the urging member can be received by the bobbin, the load caused by the pressing force of the urging member is not applied to the connection terminal. As a result, even if the connection terminal is connected to the housing and the coil assembly is assembled to the housing in advance in the stage prior to the mounting process of attaching the housing to the base, the load caused by the return of the urging member is not applied to the connection terminal. In this way, according to the mounting structure for the coil assembly of the present invention, it is possible to eliminate the load on the connection terminal while preventing vibrations and the like of the coil assembly (yoke) by the biasing member. In other words, according to the mounting structure for the coil assembly of the present invention, it is possible to improve the strength of the coil assembly. Effect of the Invention

[0018] According to the coil assembly and mounting structure for the coil assembly of the present invention, it is possible to eliminate the load on the connection terminals while preventing vibrations and the like of the coil assembly, thereby improving the strength of the coil assembly. [Brief description of the drawings]

[0019] [Figure 1] 1 is a cross-sectional view showing a coil assembly according to an embodiment of the present invention; [Diagram 2] FIG. 11 is a cross-sectional view showing the coil assembly attached to the housing. [Diagram 3] FIG. 11 is a cross-sectional view showing a state in which the coil assembly is attached to the housing. [Figure 4] FIG. 11 is a cross-sectional view showing the state in which the housing having the coil assembly attached thereto is attached to the base body. [Diagram 5] FIG. 11 is a cross-sectional view showing a state in which a conventional coil assembly is attached to a housing. [Figure 6] FIG. 11 is a cross-sectional view showing a state in which a housing having a conventional coil assembly attached thereto is attached to a base. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the following, an electronic control device of a brake fluid pressure control device mounted on a vehicle will be described as an example of a device to which a coil assembly is to be assembled, but the purpose is not to limit the device to which the coil assembly is to be assembled. Examples of the vehicle include motorcycles, three-wheeled vehicles, all-terrain vehicles (ATVs), and four-wheeled vehicles, as well as hybrid vehicles that also use a motor, vehicles that are powered only by a motor, and vehicles that are powered only by a fuel cell or an engine (internal combustion engine).

[0021] Fig. 1 is a cross-sectional view showing a coil assembly 10 of this embodiment. Fig. 2 is a cross-sectional view showing a state in which the coil assembly 10 is attached to a housing 1. Fig. 3 is a cross-sectional view showing a state in which the coil assembly 10 is attached to the housing 1. Fig. 4 is a cross-sectional view showing a state in which the housing 1 to which the coil assembly 10 is attached is attached to a base 5. In this embodiment, the insertion direction (vertical direction in FIG. 1) of the solenoid valve 6 (see FIG. 4) is defined as the axial direction of the coil assembly 10. In FIG. 1, the side where the connection terminal 16 is arranged is defined as the upper side, and the opposite side is defined as the lower side, and the "vertical direction" is shown for convenience, but the actual mounting direction of the coil assembly 10 is not limited to this "vertical direction."

[0022] As shown in FIG. 1, the coil assembly 10 includes a coil 13 formed by winding a wire around a bobbin 11, a yoke 14 that houses the coil 13, a pair of connection terminals 16 (only one side is shown in FIG. 1) standing on the bobbin 11, and a biasing member 15.

[0023] A terminal support portion 11s that supports a connection terminal 16 is integrally provided on the upper portion of the bobbin 11. The terminal support portion 11s is inserted into an insertion hole 14a provided in the yoke 14 and protrudes above the yoke 14 through the insertion hole 14a. As a result, the connection terminal 16 protrudes to the outside of the yoke 14 via the terminal support portion 11s. The connection terminal 16 is electrically connected to the winding of the coil 13. The connection terminal 16 includes an attachment portion 16a that is attached to the middle wall portion 2 of the housing 1 (see FIG. 2 ) and a connection portion 16b that is electrically connected to the control board 3.

[0024] The yoke 14 is a cylindrical member that surrounds the coil 13 and forms a magnetic path. An insertion hole 14f is formed in the center of the yoke 14, through which the solenoid valve 6 (see FIG. 4) is inserted. The yoke 14 includes an inner cylinder 141, an outer cylinder 142, an upper plate 143, and a lower plate 144. An outer peripheral surface 14c of the inner cylinder 141 functions as a support surface that supports the coil 13. The coil 13 is attached so as to be movable in the axial direction relative to the outer peripheral surface 14c. This allows the coil 13 and the yoke 14 to be relatively movable in the axial direction. In addition, the terminal support portion 11s and the connection terminal 16 can also move relative to the yoke 14 as the coil 13 moves.

[0025] The cross-sectional area of ​​the inside of the yoke 14 defined by the inner tube 141, the outer tube 142, the upper plate 143, and the lower plate 144 is set to be larger than the cross-sectional area of ​​the outer shape of the coil 13. In this embodiment, spaces S1 and S2 are formed between the coil 13 and the yoke 14. The space S1 is formed on the lower side of the coil 13 (the side opposite to the side on which the terminal support portion 11s is provided in the axial direction). The first space S1 is a space formed between the lower surface 11b of the bobbin 11 and the upper surface 14b of the lower plate 144 of the yoke 14. The space S1 functions as a placement space for placing the urging member 15. That is, the urging member 15 is interposed between the bobbin 11 and the yoke 14 on the axially opposite side to the side on which the connection terminal 16 is provided. The second space S2 is formed between the outer peripheral surface of the coil 13 and the inner peripheral surface 14j of the outer tube 142. The space S2 is a space for allowing the coil 13 and the yoke 14 to move relative to each other.

[0026] The biasing member 15 is disposed in the space S1. The biasing member 15 is a spring member that applies a pressing force (biasing force) to the yoke 14. In this embodiment, a disc spring having a spring portion with a substantially conical cross section is used as the biasing member 15. Note that the biasing member 15 may be any spring member that applies a pressing force to the yoke 14, and various spring members such as a disc spring, a coil spring, a leaf spring, a wave washer, etc. may be used as the biasing member 15.

[0027] An upper end of the urging member 15 abuts against the lower surface 11b of the bobbin 11. A lower end of the urging member 15 abuts against the upper surface 14b of the lower plate 144 of the yoke 14. In other words, the structure is such that the downward pressing force caused by the restoration of the urging member 15 acts directly on the yoke 14. In addition, the biasing member 15 is illustrated as being arranged so that the apex side (not shown) of the spring portion having a conical cross section faces the coil 13 side, but it may be arranged upside down.

[0028] A brake fluid pressure control device 100 to which such a coil assembly 10 is attached includes a housing 1 and a base 5, as shown in Fig. 4. The housing 1 is, for example, a box-shaped member integrally molded from a resin material. The coil assembly 10 is attached to the housing 1 via a connection terminal 16, as shown in Fig. 2.

[0029] As shown in Figures 2, 3 and 4, the housing 1 includes an intermediate wall 2 that divides the inside of the housing 1, and a control board 3 installed in the housing 1. The intermediate wall 2 is formed with a holding portion 2a to which the mounting portion 16a of the connection terminal 16 is attached. The bottom side of the holding portion 2a is formed with a step portion 2a1 to which the mounting portion 16a abuts. The control board 3 includes a terminal portion 3a to which the connection portion 16b of the connection terminal is electrically connected. Note that the connection portion 16b of the connection terminal 16 may be structured to be connected to a bus bar, terminal, or the like (not shown). 2, the coil assembly 20 is configured to be attached in advance to the housing 1 (middle wall portion 2) with the mounting portion 16a of the connection terminal 16 attached to the holding portion 2a of the middle wall portion 2 and the connection portion 16b of the connection terminal 16 connected to the terminal portion 3a of the control board 3. Then, the yoke 14 of the coil assembly 20 abuts against the mounting surface 5a of the base 5 at the stage of attaching the housing 1 to the base 5.

[0030] When mounting the coil assembly 10 to the housing 1, a mounting jig 30 is used, as shown in Fig. 3. In this case, the housing 1 is fixed to a fixing portion (not shown), the coil assembly 10 is positioned on the upper surface of the jig 30, and the jig 30 is raised toward the intermediate wall portion 2. Then, the connection portion 16b of the connection terminal 16 is inserted into the opening of the terminal portion 3a of the control board 3, and the mounting portion 16a of the connection terminal 16 is inserted into the opening of the holding portion 2a of the intermediate wall portion 2. When the jig 30 is further raised, the yoke 14 moves upward relative to the coil 13, and the biasing member 15 is pushed by the upper surface 14b of the lower plate 144 of the yoke 14 and deformed into a substantially flat shape. In this state, the force of the jig 30 pushing up the yoke 14 is transmitted to the coil 13 (bobbin 11) via the biasing member 15, and then transmitted from the coil 13 to the connection terminal 16 through the terminal support portion 11s. As a result, the connection portion 16b of the connection terminal 16 is inserted into the terminal portion 3a of the control board 3, and the mounting portion 16a of the connection terminal 16 is pressed into the holding portion 2a of the intermediate wall portion 2 and abuts against the step portion 2a1 of the holding portion 2a. In this way, the coil assembly 10 can be attached to the housing 1. It is also possible to transport the product in a state in which the coil assembly 10 is attached to the housing 1.

[0031] The connection terminal 16 may have a press-fit portion configured to be pressure-inserted into the terminal portion 3a (insertion hole) of the control board 3 or the like. In this case as well, the coil assembly 10 is attached in advance to the housing 1 via the press-fit portion.

[0032] The base 5 is formed of a metal member such as aluminum or an aluminum alloy, and functions as a counterpart member to which the housing 1 is attached, as shown in Fig. 4. A solenoid valve 6 that functions as a component of a hydraulic circuit is attached to the base 5. The solenoid valve 6 is fixed by inserting a lower portion into a mounting hole (not shown) provided in the base 5, and the other portion protrudes upward from the mounting surface 5a of the base 5. When the housing 1 is attached to the base 5, the portion of the solenoid valve 6 that protrudes upward from the mounting surface 5a is inserted into the insertion hole 14f of the coil assembly 10.

[0033] Next, the action of the biasing member 15 will be described with reference to FIGS. 2, in the state prior to mounting the housing 1 to the base 5, the yoke 14 is pressed downward relative to the coil 13 by the biasing force of the biasing member 15. The pressing force caused by the restoration of the biasing member 15 also acts on the bobbin 11, and the upper surface 11a of the bobbin 11 abuts against the lower surface 14e of the upper plate 143 of the yoke 14 due to the pressing force. In other words, the pressing force caused by the restoration of the biasing member 15 remains on the bobbin 11 and does not act on the connection terminal 16 above it.

[0034] On the other hand, the biasing member 15 is set to press the yoke 14 against the base 5 when the housing 1 is attached to the base 5. When the housing 1 is attached to the base 5, the coil assembly 20 is attached to the attachment surface 5a of the base 5, whereby the yoke 14 is pushed upward and the biasing member 15 is contracted, as shown in FIG. 4. In this state, the pressing force caused by the restoration of the biasing member 15 becomes larger than in the state before the housing 1 is attached to the base 5, so that the yoke 14 is strongly pressed against the attachment surface 5a of the base 5. Meanwhile, the bobbin 11 is abutted against the step portion 2a1 formed on the holding portion 2a of the intermediate wall portion 2 through the attachment portion 16a of the connection terminal 16.

[0035] According to the coil assembly 10 and the mounting structure of the coil assembly 10 of the present embodiment described above, the yoke 14 can be pressed against the mounting surface 5a of the base 5 to which the coil assembly 10 is attached. This makes it possible to prevent the yoke 14 from vibrating relative to the base 5 when subjected to an external force. In addition, it is possible to prevent contact between the yoke 14 and the solenoid valve 6 inserted through the yoke 14. In addition, since the pressing force caused by the restoration of the urging member 15 can be received by the bobbin 11, the load caused by the pressing force of the urging member 15 is not applied to the connection terminal 16. As a result, even if the connection terminal 16 is connected to the housing 1 and the coil assembly 10 is assembled to the housing 1 in advance, prior to the mounting process of mounting the housing 1 to the base 5 on which the coil assembly 10 is mounted, the load caused by the restoration of the urging member 15 is not applied to the connection terminal 16. In this way, according to the coil assembly 10 and the mounting structure for the coil assembly 10 of this embodiment, it is possible to prevent vibrations and the like of the coil assembly 10 (yoke 14) by the biasing member 15 while eliminating the load on the connection terminal 16. In other words, according to the coil assembly 10 and the mounting structure for the coil assembly 10 of this embodiment, it is possible to improve the strength of the mounting structure.

[0036] In addition, since the biasing member 15 is a disc spring, the biasing member 15 can be suitably disposed in the narrow space defined by the bobbin 11 inside the yoke 14 and the yoke 14 .

[0037] In addition, since the biasing member 15 is interposed between the bobbin 11 and the yoke 14 on the axially opposite side to the side where the connection terminal 16 is provided, it is easy to ensure the arrangement space for the biasing member 15. Therefore, the assembling of the biasing member 15 and the productivity of the coil assembly 10 are excellent.

[0038] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit of the present invention. For example, although the coil assembly 10 is pre-attached to the housing 1 in the above description, this is not limited to this, and the present invention can also be suitably applied to a case in which the housing 1 is attached to the base 5 with the coil assembly 10 attached to the mounting surface 5a of the base 5.

[0039] In addition, the biasing member 15 is not limited to an annular member such as a disc spring, and may be disposed in a portion of the circumferential direction. In this case, the biasing member 15 may be disposed only in a portion corresponding to the axial direction of the connection terminal 16. [Explanation of symbols]

[0040] 1. Housing 2 Intermediate wall 3 Control board (electrical components) 5 Base 5a Mounting surface 6. Solenoid valve 10 Coil assembly 11 Bobbin 13 Coil 14 York 15. Pressing member 16 Connection terminal

Claims

1. A coil formed by winding a wire around a bobbin; a yoke that houses the coil; a connection terminal electrically connected to the winding and protruding outside the yoke, The coil and the yoke are relatively movable in an axial direction, a biasing member for applying a pressing force to the yoke, the biasing member being disposed between the bobbin and the yoke within the yoke;

2. 2. The coil assembly according to claim 1, wherein the biasing member is a disc spring.

3. 3. The coil assembly according to claim 1, wherein the biasing member is interposed between the bobbin and the yoke on an axially opposite side to a side on which the connection terminal is provided.

4. A mounting structure for a coil assembly, comprising: a base on which a solenoid valve is disposed; a coil assembly for driving the solenoid valve; and a housing to which the coil assembly is connected via a connection terminal, The coil assembly includes: A coil formed by winding a wire around a bobbin; a yoke that houses the coil; a connection terminal electrically connected to the winding and protruding to an outside of the yoke, The coil and the yoke are relatively movable in an axial direction, a biasing member that applies a pressing force to the yoke is interposed between the bobbin and the yoke in the yoke, a biasing member for biasing the yoke against a mounting surface of the base when the housing is attached to the base;

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