Resin molded product and method for manufacturing a resin molded product

Abstract

The present invention discloses a resin molded product that enables a reduction in the number of parts and assembly man-hours, while ensuring waterproofness between a first synthetic resin component such as a connector mounting part and a second synthetic resin component such as a case. [Solution] The resin molded product 10 comprises a first part 20 made of synthetic resin and a second part 22 made of synthetic resin. The first part 20 is integrated with the second part 22 and has an embedded part 24 that surrounds the waterproof area 34 of the second part 22 and is embedded in the second part 22. A waterproof thermoplastic elastomer 26 is placed and welded between the opposing surfaces 55, 73, 78, and 82 of the embedded part 24 and the second part 22.

Description

Technical Field

[0001] This disclosure relates to a resin molded product and a method for manufacturing a resin molded product.

Background Art

[0002] Patent Document 1 discloses a configuration in an electrical connection box, which is a type of resin molded product, where a case that houses a circuit component including a circuit board, a lid that closes an opening provided in the case, and a plurality of connector mounting parts that project through the lid are fixedly provided on the lid.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the structure of Patent Document 1, a plurality of connector mounting parts are fixed to the lid by means such as bolt tightening, and fastening members are required to hold the connectors on the lid. Furthermore, in order to ensure waterproofness, it is necessary to sandwich a sealing rubber between the lid and the connectors or to bolt-tighten the lid to the case with a sealing rubber sandwiched between the contact surface of the peripheral edge of the opening of the case and the lid. Therefore, the number of parts is large and the assembly work is complicated, and due to the need to secure a large number of spaces for the fastening members, there is a limit in coping with the miniaturization of the product.

[0005] Therefore, a resin molded product and a method for manufacturing a resin molded product are disclosed, which can reduce the number of parts and the number of assembly steps and ensure waterproofness between a first synthetic resin part such as a connector mounting part and a second synthetic resin part such as a case.

Means for Solving the Problems

[0006] The resin molded product of this disclosure comprises a first component made of synthetic resin and a second component made of synthetic resin, wherein the first component is integrated with the second component and has an embedded portion that surrounds the periphery of the waterproof area of ​​the second component and is embedded in the second component, and a waterproof thermoplastic elastomer is placed and welded between the embedded portion and the opposing surface of the second component.

[0007] The method for manufacturing a resin molded article according to the present disclosure is a method for manufacturing a resin molded article according to the present disclosure, comprising: a first part molding step of injection molding the first part; a primary molded article molding step of integrally molding the first part and the waterproof thermoplastic elastomer with the first part molded in the first part molding step as an insert to form a primary molded article; and a second part molding step of injection molding the second part with the primary molded article as an insert such that the thermoplastic elastomer is positioned between the embedded portion of the first part and the opposing surface of the second part.

[0008] A method for manufacturing a resin molded article according to another aspect of the present disclosure is a method for manufacturing a resin molded article according to the present disclosure, comprising: a thermoplastic elastomer molding step of injection molding the thermoplastic elastomer; a primary molded article molding step of integrally molding the thermoplastic elastomer and the first part using the thermoplastic elastomer molded in the thermoplastic elastomer molding step as an insert to form a primary molded article; and a second part molding step of injection molding the second part using the primary molded article as an insert so that the thermoplastic elastomer is positioned between the embedded portion of the first part and the opposing surface of the second part.

[0009] A method for manufacturing a resin molded article according to yet another aspect of the present disclosure is a method for manufacturing a resin molded article according to the present disclosure, comprising: a first component molding step of injection molding the first component; a thermoplastic elastomer molding step of injection molding the thermoplastic elastomer; an assembly step of assembling the first component and the thermoplastic elastomer such that the thermoplastic elastomer is positioned between the embedded portion of the first component and the opposing surface of the second component; and a second component molding step of injection molding the second component using the assembly of the first component and the thermoplastic elastomer assembled in the assembly step as an insert. [Effects of the Invention]

[0010] According to this disclosure, it is possible to provide a resin molded product and a method for manufacturing a resin molded product that can reduce the number of parts and assembly man-hours, and can ensure waterproofness between a first synthetic resin part such as a connector mounting part and a second synthetic resin part such as a case. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a plan view showing an electrical junction box, which is a resin molded product according to Embodiment 1. [Figure 2] Figure 2 is a longitudinal cross-sectional view showing an enlarged view of the main part of the II-II section in Figure 1. [Figure 3] Figure 3 is a longitudinal cross-sectional view showing an enlarged view of the main part of the III-III section in Figure 1. [Figure 4] Figure 4 is a perspective view of the first component of the resin molded product shown in Figure 1, with the connection terminals attached, viewed from the bottom. [Figure 5] Figure 5 is a perspective view of the first component shown in Figure 4, taken from the bottom side, with the thermoplastic elastomer integrally formed. [Figure 6] Figure 6 is a vertical cross-sectional view showing an enlarged view of the main part of an electrical connection box comprising a resin molded product according to Embodiment 2, and corresponds to Figure 2. [Modes for carrying out the invention]

[0012] <Description of Embodiments in this Disclosure> First, embodiments of this disclosure will be listed and described. The resin molded articles disclosed herein are (1) The device comprises a first component made of synthetic resin and a second component made of synthetic resin, wherein the first component has an embedded portion that surrounds the periphery of the waterproof area of ​​the second component and is embedded in the second component, and a waterproof thermoplastic elastomer is placed and welded between the embedded portion and the opposing surface of the second component.

[0013] According to the resin molded product of this embodiment, the first component is integrated with the second component, having an embedded portion that surrounds the waterproof area of ​​the second component and is embedded in the second component. Furthermore, a waterproof thermoplastic elastomer is placed and welded between the embedded portion of the first component embedded in the second component and the opposing surface of the second component. As a result, after molding the first component, the thermoplastic elastomer can be integrally molded using the first component as an insert, or after molding the thermoplastic elastomer, the first component can be integrally molded using the thermoplastic elastomer as an insert to form a primary molded product, and the second component can be secondary molded using this primary molded product as an insert to ensure the waterproofing of the waterproof area of ​​the second component. This allows for a simple and reliable production of a resin molded product in which the first component and the second component are integrated, ensuring the waterproofing of the waterproof area of ​​the second component. Alternatively, the first component and the thermoplastic elastomer may be formed separately, and the second component may be integrally molded using the assembled first component as an insert.

[0014] For example, if the second component is the case of an electrical junction box and the first component is, for example, a component mounting part that protrudes through the opening of the case, the conventional structure requires the placement of a sealing rubber between the first and second components and the subsequent fixing of the two components by bolting, eliminating the need for this process and simplifying assembly. Furthermore, the elimination of separate fastening components and sealing rubber reduces the number of parts and lowers the cost of the product. In addition, since the location and structure for fastening components are no longer required, the resin molded product can be made smaller.

[0015] In particular, a thermoplastic elastomer is positioned and welded between the embedded portion of the first component and the opposing surface of the second component. Therefore, even if a gap occurs between the opposing surfaces of the first and second components due to different resin materials or relatively hard resin materials such as glass fiber reinforced resin, the waterproof area is surrounded by the welded portion of the thermoplastic elastomer, thus advantageously preventing water from entering the waterproof area through the gap.

[0016] (2) In (1) above, it is preferable that an annular groove surrounding the waterproof area is formed on the surface of the embedded portion facing the second component, and that the thermoplastic elastomer is placed in the groove. Since the embedded portion of the first component is provided with a groove that opens on the surface facing the second component, the thermoplastic elastomer can be placed in the groove. This makes it possible to second-mold the second component using a primary molded product consisting of the first component and the thermoplastic elastomer, or an assembly thereof, as an insert, with the thermoplastic elastomer positioned and placed on the surface of the embedded portion facing the second component. As a result, it is possible to easily and stably embed and weld the thermoplastic elastomer between the surface of the embedded portion and the second component, and to further improve the waterproof performance of the waterproof area of ​​the resin molded product.

[0017] (3) In the above (2), the second component includes a case that houses a circuit board inside, the first component includes a connector mounting portion provided at an opening of the case as the waterproof area, the connector mounting portion has a hood portion protruding on the case and an embedded portion that spreads in a flange shape on the base end side of the hood portion, and it is preferable that the thermoplastic elastomer filled in the annular concave groove provided in the embedded portion is arranged to surround the periphery of the opening. When the second component of the resin molded product is a case that houses a circuit board inside and the first component is a connector mounting portion provided at the opening of the case, the resin molded product having the waterproof function of this aspect can be applied to an electrical connection box. At this time, by using the flange-shaped portion on the base end side that bears the load applied to the connector mounting portion as the embedded portion, an annular concave groove surrounding the periphery of the opening can be advantageously provided. Then, by filling the thermoplastic elastomer in the concave groove surrounding the periphery of the opening, the waterproof performance by the thermoplastic elastomer welded between the opposing surfaces of the case and the embedded portion can be reliably and stably realized over the entire circumference of the opening.

[0018] (4) In the above (3), the connector mounting portion has a terminal holding wall that partitions the hood portion into the inner side and the outer side of the case, includes connection terminals that penetrate the terminal holding wall and protrude to the inner side and the outer side of the case, and it is preferable that the connection terminals are fixedly held by the terminal holding wall. Since the connection terminals are fixedly held by the terminal holding wall provided inside the hood portion of the connector mounting portion, the case can be secondarily molded with the connector mounting portion holding the connection terminals as an insert part. Thereby, further improvement in assembly workability and facilitation of adjustment of the alignment of the connection terminals can be achieved. Note that the fixed holding of the connection terminals to the terminal holding wall can be realized by press-fitting and fixing the connection terminals to the terminal holding wall, integrally molding the connector mounting portion with the connection terminals as an insert part, or the like.

[0019] (5) In the above (3), it is preferable that the connector mounting portion has a terminal holding wall that partitions the hood portion into the inner side and the outer side of the case, and the terminal holding wall is provided with insertion holes that allow the insertion of connection terminals protruding to the inner side and the outer side of the case. Since insertion holes that allow the insertion of connection terminals are provided in the terminal holding wall provided in the hood portion of the connector mounting portion, the connector mounting portion can be constituted by inserting connection terminals protruding from a circuit board constituting an electric circuit housed in the case. Further, if there are unused insertion holes in the terminal holding wall, the insertion holes can be used for taking out necessary electrical signals from the circuit board as needed, and the versatility of the connector mounting portion can also be improved. In addition, in order to prevent water from entering the case from the insertion holes, a sealing rubber may be sandwiched between the hood portion and the mating connector.

[0020] (6) In the above (2), the second component includes a case that houses a circuit board inside, and the first component includes a connection terminal having one end connected to the circuit board and a terminal fastening portion at the other end, and a terminal base that holds the connection terminal in a state where the terminal fastening portion is exposed above the waterproof area. The waterproof area includes a through portion through which the intermediate portion of the connection terminal penetrates, and the buried portion is constituted by the peripheral edge portion of the base end portion of the terminal base. It is preferable that the thermoplastic elastomer filled in the annular concave groove provided in the buried portion is disposed so as to surround the periphery of the through portion. When the first component is a terminal base and the second component is a case that houses a circuit board inside, the case includes a through portion through which the intermediate portion of a connection terminal having one end connected to the circuit board and the terminal portion of an external wire harness or the like fastened to the other end penetrates, and the through portion becomes a waterproof area. At this time, by using the peripheral edge portion of the terminal base that bears the load applied to the terminal base, an annular concave groove surrounding the periphery of the through portion can be advantageously provided. Then, by filling the thermoplastic elastomer in the concave groove surrounding the through portion, waterproofness by the thermoplastic elastomer welded between the opposing surfaces of the case and the buried portion can be surely and stably realized over the entire circumference of the through portion.

[0021] The method for manufacturing a resin molded article disclosed herein is: (7) A method for manufacturing a resin molded product as described in (1) above, comprising: a first part molding step of injection molding the first part; a primary molded product molding step of integrally molding the first part and the waterproof thermoplastic elastomer using the first part molded in the first part molding step as an insert to form a primary molded product; and a second part molding step of injection molding the second part using the primary molded product as an insert so that the thermoplastic elastomer is positioned between the embedded portion of the first part and the opposing surface of the second part.

[0022] According to this embodiment, the resin molded product described in embodiment (1) above can be manufactured advantageously, and a resin molded product that can achieve the same effects as in embodiment (1) above can be provided.

[0023] Another method for manufacturing the resin molded articles of this disclosure is: (8) A method for manufacturing a resin molded product as described in the embodiment of (1) above, comprising: a thermoplastic elastomer molding step of injection molding the thermoplastic elastomer; a primary molded product molding step of integrally molding the thermoplastic elastomer and the first part using the thermoplastic elastomer molded in the thermoplastic elastomer molding step as an insert to form a primary molded product; and a second part molding step of injection molding the second part using the primary molded product as an insert so that the thermoplastic elastomer is positioned between the embedded portion of the first part and the opposing surface of the second part.

[0024] According to this embodiment, the resin molded product described in embodiment (1) above can be manufactured advantageously, and a resin molded product that can achieve the same effects as in embodiment (1) above can be provided.

[0025] Another method for manufacturing the resin molded articles disclosed herein is: (9) A method for manufacturing a resin molded product as described in (1) above, comprising: a first component molding step of injection molding the first component; a thermoplastic elastomer molding step of injection molding the thermoplastic elastomer; an assembly step of assembling the first component and the thermoplastic elastomer such that the thermoplastic elastomer is positioned between the embedded portion of the first component and the opposing surface of the second component; and a second component molding step of injection molding the second component using the assembly of the first component and the thermoplastic elastomer assembled in the assembly step as an insert.

[0026] According to this embodiment, the resin molded product described in embodiment (1) above can be manufactured advantageously, and a resin molded product that can achieve the same effects as in embodiment (1) above can be provided.

[0027] (10) In any one of (7) to (9) above, the first component has an annular groove formed on the surface of the embedded portion facing the second component, surrounding the periphery of the waterproof area, and it is preferable to use the primary molded product, in which the thermoplastic elastomer is placed in the groove of the embedded portion, as an insert product when performing the second component molding process. According to this embodiment, the resin molded product described in embodiment (2) above can be manufactured advantageously, and a resin molded product that can achieve the same effects as in embodiment (2) above can be provided.

[0028] <Details of the embodiments of this disclosure> Specific examples of the resin molded articles of this disclosure will be described below with reference to the drawings. However, this disclosure is not limited to these examples and is intended to include all modifications within the meaning and scope equivalent to the claims as indicated by the claims.

[0029] <Embodiment 1> Hereinafter, an electrical junction box 10, which is a resin molded product of Embodiment 1 of this disclosure, will be described with reference to Figures 1 to 5. This electrical junction box 10 includes a case 14 that houses a circuit board 12 inside. Specifically, the case 14 is composed of an upper case 16 and a lower case 18, and the case 14 is formed by the upper opening 19 of the lower case 18 being covered by the upper case 16. The electrical junction box 10 can be positioned in any orientation, but in the following description, "upper" refers to the upper part in Figure 2, "lower" refers to the lower part in Figure 2, "front" refers to the left side in Figure 1, "rear" refers to the right side in Figure 1, "left" refers to the upper part in Figure 1, and "right" refers to the lower part in Figure 1. In addition, for multiple identical components, reference numerals may be assigned to only some of the components, while the reference numerals for other components may be omitted.

[0030] <Resin molded product (electrical connection box 10)> The electrical junction box 10 comprises a first component 20 made of synthetic resin and a second component 22 made of synthetic resin. The first component 20 has an embedded portion 24 that surrounds the waterproof area 23 (opening 40 and penetration 42 described later) of the second component 22 and is embedded in the second component 22. With this embedded portion 24 embedded in the second component 22, the first component 20 and the second component 22 are integrated. A waterproof thermoplastic elastomer 26 is placed and welded between the opposing surfaces of the embedded portion 24 and the second component 22 (outer surfaces 55, 73 and inner surfaces 78, 82 described later). That is, the embedded portion 24 and the thermoplastic elastomer 26 are fused together at their contact surfaces, and the second component 22 and the thermoplastic elastomer 26 are fused together at their contact surfaces. Furthermore, the embedded portion 24 of the first component 20 does not need to be embedded in the second component 22 as a whole; a portion of the embedded portion 24 may be exposed to the outside from the second component 22.

[0031] In particular, in Embodiment 1, the electrical connection box 10 (especially the upper case 16) comprises a plurality of first components 20, each of which includes a plurality of connector mounting sections 32 (described later) and a terminal block 34. The second component 22 includes a case 14 that houses the circuit board 12, and specifically includes an upper bottom wall section 36 and a lower case 18 in the upper case 16 (described later). Therefore, in Embodiment 1, the second component 22 is composed of a plurality of members.

[0032] The circuit board 12 housed in the electrical connection box 10 (case 14) is not limited to any particular type, but a known circuit board such as a rigid printed circuit board or a flexible printed circuit board (FPC) may be used, and an electrical circuit (not shown) is printed on at least one surface of the circuit board 12 in the thickness direction. Furthermore, through-holes 28 that penetrate the circuit board 12 in the thickness direction are formed at predetermined locations on the circuit board 12. The method of fixing the circuit board 12 to the case 14 is not limited to any particular type.

[0033] <Upper Case 16> The upper case 16 comprises a first component 20 consisting of multiple connector mounting sections 32 and one terminal block 34. The upper case 16 also includes a substantially flat upper bottom wall section 36, and as described above, the upper bottom wall section 36 constitutes the second component 22. Each first component 20 (each connector mounting section 32 and terminal block 34) is fixed to the upper bottom wall section 36. Specifically, the upper bottom wall section 36 comprises multiple waterproof areas 23 to which each first component 20 is provided. Specifically, the waterproof areas 23 include openings 40 to which each connector mounting section 32 is fixed and through sections 42 to which the terminal block 34 is fixed.

[0034] <Lower Case 18> The lower case 18 is generally box-shaped, opening upward (having an upper opening 19), and comprises a generally flat bottom wall portion 44 that extends horizontally (in a direction perpendicular to the vertical direction), and a lower peripheral wall portion 46 that protrudes upward from the outer peripheral edge of the bottom wall portion 44. Therefore, the upper opening 19 is formed by the upper end of the lower peripheral wall portion 46. The method of fixing the upper case 16 and the lower case 18 is not limited.

[0035] The lower case 18 can be formed from a rigid material such as metal or synthetic resin. When the lower case 18 is made of synthetic resin, materials such as polyphenylene sulfide (PPS) or polybutylene terephthalate (PBT) are preferably used. Furthermore, when the lower case 18 is made of synthetic resin, it may be reinforced with glass fibers or the like.

[0036] <Part 1 20 (Connector mounting section 32)> In Embodiment 1, as described above, some of the first component 20 are made up of connector mounting portions 32. Each connector mounting portion 32, as shown in Figures 2 and 4, includes a hood portion 52 that protrudes upward from the case 14 (particularly the upper bottom wall portion 36 of the upper case 16) and an embedded portion 24 that spreads out in a flange-like manner at the base end (lower end) of the hood portion 52. In Embodiment 1, the hood portion 52 is substantially cylindrical and continuous around the entire circumference, and the embedded portion 24 at the base end (lower end) of the hood portion 52 is formed as a substantially annular portion that protrudes outward around the entire circumference. In particular, in Embodiment 1, each hood portion 52 is formed in a substantially rectangular annular shape in plan view, and each embedded portion 24 is also formed in a substantially rectangular annular shape in plan view. A groove 54 that opens downward is formed on the lower surface of the embedded portion 24, which is thus substantially rectangular annular. As will be described later, in the connector mounting portion 32, the outer surface 55 of the embedded portion 24, including the inner circumferential surface, lower surface, and outer circumferential surface of the embedded portion 24, forms the opposing surface between the embedded portion 24 and the second component 22. Therefore, the groove 54 opens onto the surface of the embedded portion 24 that faces the second component 22.

[0037] Each groove 54 is an annular groove that extends continuously around the entire circumference in the circumferential direction. In Embodiment 1, each groove 54 is formed in the radially intermediate portion of the lower surface of each embedded portion 24. As mentioned above, each embedded portion 24 is provided surrounding the periphery of the waterproof area 23, and therefore each groove 54 is provided surrounding the periphery of each waterproof area 23. In particular, in Embodiment 1, each groove 54 has a rectangular cross-sectional shape with an upper bottom wall surface and an inner surface consisting of both sides.

[0038] In Embodiment 1, the connector mounting portion 32 has a terminal retaining wall 58 that divides the hood portion 52 into an inward (downward) side and an outward (upward) side of the case 14. The connector mounting portion 32 also includes connection terminals 60 that penetrate the terminal retaining wall 58 and protrude to the inward (downward) side and outward (upward) side of the case 14. In Embodiment 1, a plurality of connection terminals 60 are provided, and each connection terminal 60 is fixedly held by the terminal retaining wall 58. Each connection terminal 60 is arranged in alignment in the front-to-back and left-to-right directions on the inner circumference of the hood portion 52.

[0039] Specifically, in the vertically intermediate portion of the hood portion 52, a terminal retaining wall 58 is provided that extends horizontally on the inner circumference side of the hood portion 52. The intermediate portion of each connection terminal 60 extending in the vertical direction is embedded in the terminal retaining wall 58, with one end (lower end) of each connection terminal 60 protruding downward from the terminal retaining wall 58 and the other end (upper end) of each connection terminal 60 protruding upward from the terminal retaining wall 58. In other words, when the upper case 16, which includes each connector mounting portion 32, is fixed to the lower case 18 to form the case 14 (electrical connection box 10), one end (lower end) of each connection terminal 60 protrudes inward from the case 14, and the other end (upper end) of each connection terminal 60 protrudes outward from the case 14.

[0040] In Embodiment 1, as shown in Figure 4, the connector mounting portion 32 is formed as an integrally molded product equipped with each connection terminal 60. Specifically, when molding the connector mounting portion 32, injection molding is performed with each connection terminal 60 set as an insert in the molding cavity of the connector mounting portion 32, thereby forming the connector mounting portion 32 as an integrally molded product equipped with each connection terminal 60. As a result, each connection terminal 60 is fixedly held against the terminal holding wall 58. The resin material constituting the connector mounting portion 32 (hood portion 52 and embedded portion 24) is not limited as long as it is rigid, but materials such as PPS and PBT are preferably used, similar to the lower case 18, and it may be reinforced with, for example, glass fiber.

[0041] Furthermore, the other end (upper end) of each connection terminal 60 is located on the inner circumference side of the hood portion 52 and protrudes upward. As a result, each connector mounting portion 32 constitutes a male connector, and when a female connector (not shown) which is the mating connector is attached to each connector mounting portion 32, each connection terminal 60 and the connection terminal of the female connector are electrically connected.

[0042] <Part 1 20 (Terminal Block 34)> In Embodiment 1, as described above, one of the first components 20 is comprised of a terminal block 34. This terminal block 34 includes a connecting terminal 66 having one end connected to a circuit board 12 and the other end having a terminal fastening portion 64, and a terminal base 68 that holds the connecting terminal 66 with the terminal fastening portion 64 exposed above the through portion 42, which is the waterproof area 23.

[0043] Specifically, in Embodiment 1, the connection terminal 66 is bent in a roughly L-shape, with one end extending downward and connected to the circuit board 12. The other end of the connection terminal 66 spreads horizontally, forming a terminal fastening portion 64 that is roughly rectangular in plan view. A bolt insertion hole 70 is formed in the central part of the terminal fastening portion 64, penetrating in the thickness direction (vertical direction), and the shaft of a stud bolt 72 positioned below the terminal fastening portion 64 protrudes upward through the bolt insertion hole 70. Thus, when a mating terminal (not shown) is connected to the connection terminal 66, the shaft of the stud bolt 72 is inserted through the bolt insertion hole provided in the mating terminal, and a nut is fastened to the stud bolt 72, thereby overlapping the mating terminal and the terminal fastening portion 64 and electrically connecting them.

[0044] The terminal fastening portion 64 and the stud bolt 72 are supported on the terminal base 68, and as described above, the terminal fastening portion 64 is exposed upward, and the shaft portion of the stud bolt 72 protrudes upward. The terminal base 68 is substantially rectangular in plan view and has a predetermined thickness. The embedded portion 24 is formed by the peripheral edge of the base end (lower end) of this terminal base 68. Specifically, the base end (lower end) of the terminal base 68 protrudes outward relative to the upper portion, and the embedded portion 24 is formed by this outwardly protruding portion. This embedded portion 24 is formed in a continuous ring shape over the entire circumference in the circumferential direction.

[0045] Furthermore, a groove 54 opening downwards is formed on the lower surface of the terminal base 68. This groove 54 has the same shape as the groove 54 in the connector mounting portion 32 and is an annular groove that extends continuously around the entire circumference. This groove 54 may be provided in the embedded portion 24 or on the inner circumference side of the embedded portion 24. As will be described later, in the terminal block 34 as well, the outer surface 73 of the embedded portion 24, including the inner surface, lower surface, and outer surface of the embedded portion 24, constitutes the opposing surface between the embedded portion 24 and the second component 22. Therefore, the groove 54 opens to the surface of the embedded portion 24 that is facing the second component 22.

[0046] In Embodiment 1, the terminal block 34 is formed as an integrally molded product equipped with connection terminals 66 and stud bolts 72. Specifically, when molding the terminal block 34, the connection terminals 66 and stud bolts 72 are inserted into the molding cavity of the terminal block 34 during injection molding, thereby forming the terminal block 34 as an integrally molded product equipped with connection terminals 66 and stud bolts 72. As a result, the connection terminals 66 and stud bolts 72 are fixedly held in place by the terminal base 68. The resin material constituting the terminal base 68 is not limited as long as it is rigid, but materials such as PPS or PBT are preferably used, similar to the connector mounting portion 32, and it may be reinforced with, for example, glass fiber.

[0047] <Part 2, Chapter 22> As described above, the second component 22 is composed of an upper bottom wall portion 36 and a lower case 18 in the upper case 16. In the upper bottom wall portion 36, an opening 40 is formed as a waterproof area 23 that penetrates the upper bottom wall portion 36 vertically at the location where the connector mounting portion 32, which is each first component 20, is fixed. In addition, in the upper bottom wall portion 36, a penetration portion 42 is formed as a waterproof area 23 that penetrates the upper bottom wall portion 36 vertically at the location where the terminal block 34, which is the first component 20, is fixed.

[0048] <Waterproof area 23 (opening 40)> The opening 40, which serves as the waterproof area 23, has a shape that substantially corresponds to the connector mounting portion 32 in a plan view and is substantially rectangular. The opening 40 is formed by penetrating the upper bottom wall portion 36 in the vertical direction, and a receiving recess 76 is formed on the periphery of the opening 40 to accommodate the embedded portion 24 provided at the lower end of the connector mounting portion 32. As shown in Figure 2, the receiving recess 76 has a rectangular cross-sectional shape that substantially corresponds to the embedded portion 24 and is an annular recess that is continuous around the entire circumference in the circumferential direction around the opening 40. In short, when the first component (connector mounting portion 32) and the second component (upper bottom wall portion 36) are fixed together, each embedded portion 24 is housed within each receiving recess 76, and the outer surface 55 of each embedded portion 24 (including the inner circumferential surface, bottom surface, and outer circumferential surface of the embedded portion 24) and the inner surface 78 of each receiving recess 76 (including the inner circumferential side surface, bottom surface, and outer circumferential side surface of the receiving recess 76) are the opposing surfaces of the embedded portion 24 and the second component 22. Note that when the first component 20 and the second component 22 are fixed together and each embedded portion 24 is housed in the receiving recess 76, the upper surface of each embedded portion 24 is exposed to the outside.

[0049] <Waterproof area 23 (penetration 42)> The through-hole 42, which serves as the waterproof area 23, is the portion in the upper bottom wall 36 through which the longitudinal middle portion of the connection terminal 66 provided on the terminal block 34 is inserted, and is rectangular in shape in plan view, corresponding to the connection terminal 66. Around the through-hole 42, a housing recess 80 is formed to accommodate the terminal base 68 and the embedded portion 24. In short, when the first component (terminal block 34) and the second component (upper bottom wall 36) are fixed together, the terminal base 68 and the embedded portion 24 are housed in the housing recess 80, and the outer surfaces 73 of the terminal base 68 and the embedded portion 24 (including the lower surfaces of the terminal base 68 and the embedded portion 24 and the outer peripheral surface of the embedded portion 24) and the inner surface 82 of the housing recess 80 (including the inner peripheral side surface, bottom surface and outer peripheral side surface of the housing recess 80) are the opposing surfaces of the embedded portion 24 and the second component 22. When the first part 20 and the second part 22 are fixed together and the terminal base 68 and the embedded part 24 are housed in the recess 80, the upper portion of the terminal base 68 and the upper surface of the embedded part 24 are exposed to the outside.

[0050] <Thermoplastic Elastomer 26> Each thermoplastic elastomer 26 provided in each connector mounting portion 32 and each embedded portion 24 in the terminal block 34 has a substantially rectangular cross-section and is formed in a continuous annular shape over the entire circumference in the circumferential direction. Known materials can be used for the thermoplastic elastomer 26. In Embodiment 1, each groove 54 is opened on the lower surface of each embedded portion 24, and each thermoplastic elastomer 26 is filled and arranged in each groove 54. As a result, each thermoplastic elastomer 26 filled in each groove 54 in each connector mounting portion 32 is arranged to surround the periphery of the opening 40. In addition, the thermoplastic elastomer 26 filled in the groove 54 in the terminal block 34 is arranged to surround the periphery of the through portion 42.

[0051] <Manufacturing method for resin molded product (electrical connection box 10)> The following describes a specific example of a method for manufacturing the electrical junction box 10. However, the method for manufacturing the electrical junction box 10 is not limited to the description below.

[0052] First, in the first component molding process, the first component 20, namely the connector mounting portion 32 and the terminal block 34, is formed by injection molding. In Embodiment 1, since the connector mounting portion 32 is formed integrally with each connection terminal 60, the connector mounting portion 32 shown in Figure 4 is obtained by the first component molding process. Also, since the terminal block 34 is formed integrally with the connection terminals 66, the terminal block 34 equipped with the connection terminals 66 is obtained by the first component molding process.

[0053] Subsequently, in the primary molded product molding process, the first components 20 (connector mounting portion 32 and terminal block 34) are set as inserts in the molding cavity of the thermoplastic elastomer 26, and the resin material of the thermoplastic elastomer 26 is filled into the grooves 54 in the embedded portion 24 of each first component 20, and molded. This results in a primary molded product 84 in which the thermoplastic elastomer 26 is integrally molded into the grooves 54 of each first component 20. Figure 5 shows a primary molded product 84 consisting of the connector mounting portion 32 and the thermoplastic elastomer 26. When manufacturing this primary molded product 84, since molten thermoplastic elastomer 26 is filled into the grooves 54 in the embedded portion 24 of each first component 20, the heat of the molten thermoplastic elastomer 26 melts the inner surface of the grooves 54, causing these embedded portions 24 and the thermoplastic elastomer 26 to fuse together. During the manufacturing of each primary molded product 84, the lower surface of each thermoplastic elastomer 26 is exposed to the outside at the outer surfaces 55, 73 of each embedded portion 24.

[0054] Next, in the second part molding process, a plurality of primary molded products 84 manufactured in the primary molded product molding process are set as inserts in the molding cavity of the upper bottom wall portion 36 which constitutes a part of the second part 22, and the upper bottom wall portion 36 is formed by injection molding. As a result, a receiving recess 76 is formed to cover the area around the embedded portion 24 in each connector mounting portion 32, and a receiving recess 80 is formed to cover the area around the terminal base 68 and the embedded portion 24 in the terminal block 34, thereby forming a second part 22 (upper bottom wall portion 36) that integrally incorporates each primary molded product 84. When forming the upper bottom wall portion 36, the molten upper bottom wall portion 36 is filled into the molding cavity into which each primary molded product 84 is inserted. As a result, the heat of the molten upper bottom wall portion 36 melts the outer surfaces 55, 73 of each embedded portion 24, including the lower surface of the thermoplastic elastomer 26, causing these embedded portions 24 and the thermoplastic elastomer 26 to fuse tightly with the upper bottom wall portion 36. This completes the upper case 16.

[0055] Alternatively, the following embodiment may also be adopted as another method for manufacturing the upper case 16. First, in the thermoplastic elastomer molding process, the thermoplastic elastomer 26 is formed by injection molding.

[0056] Subsequently, in the primary molded product molding process, the thermoplastic elastomer 26 is set in the molding cavity of the first part 20, and then the resin material of the first part 20 is filled and molded. Specifically, in each connector mounting section 32, the thermoplastic elastomer 26 and each connection terminal 60 are set in the molding cavity of each connector mounting section 32, and then the resin material of each connector mounting section 32 is filled and molded. Similarly, in the terminal block 34, the thermoplastic elastomer 26 and the connection terminal 66 are set in the molding cavity of the terminal block 34, and then the resin material of the terminal block 34 is filled and molded. This results in a primary molded product 84 (each connector mounting section 32) that integrally includes the thermoplastic elastomer 26 and each connection terminal 60 as shown in Figure 5, and a primary molded product 84 (terminal block 34) that integrally includes the thermoplastic elastomer 26 and the connection terminal 66. In this process as well, since the molten first part 20 is filled into the molding cavity of the first part 20 in which the thermoplastic elastomer 26 is set, the heat of the molten first part 20 melts the surface of the thermoplastic elastomer 26, causing the first part 20 (embedded portion 24) and the thermoplastic elastomer 26 to fuse together.

[0057] Next, in the second part molding process, multiple primary molded parts 84 manufactured in the primary molded part molding process are set as inserts in the molding cavity of the second part 22 (upper bottom wall portion 36), and the upper bottom wall portion 36 is formed by injection molding. This process is the same as described in the second part molding process above. The upper case 16 can also be obtained by this manufacturing method.

[0058] Alternatively, the following embodiment may also be adopted as another embodiment of the manufacturing method of the upper case 16. First, in the first component molding step, the first component 20, that is, each connector mounting portion 32 and the terminal block 34, are formed by injection molding. In Embodiment 1, the first component molding step yields a connector mounting portion 32 integrally equipped with each connection terminal 60, as shown in Figure 4. The first component molding step also yields a terminal block 34 integrally equipped with connection terminals 66. Furthermore, in the thermoplastic elastomer molding step, the thermoplastic elastomer 26 is formed by injection molding.

[0059] Subsequently, in the assembly process, the thermoplastic elastomer 26 is assembled to the first component 20 (each connector mounting portion 32 and terminal 34) such that the thermoplastic elastomer 26 is positioned between the opposing surfaces (outer surfaces 55, 73 and inner surfaces 78, 82) of the second component 22 (upper bottom wall portion 36) and the embedded portions 24 of the connector mounting portion 32 and terminal block 34 formed in the first component molding process. Specifically, the thermoplastic elastomer 26 is inserted and fitted into the grooves 54 provided in each connector mounting portion 32 and each embedded portion 24 of the terminal block 34. This completes the assembly 86 of the first component 20 (connector mounting portion 32) and thermoplastic elastomer 26 as shown in Figure 5. Similarly, the assembly of the terminal block 34 and thermoplastic elastomer 26 is also completed, but it is not shown in the illustration.

[0060] Next, in the second component molding process, the multiple assembled parts 86 manufactured in the assembly process described above are set as inserts in the molding cavity of the second component 22 (upper bottom wall portion 36), and the upper bottom wall portion 36 is formed by injection molding. This process is the same as described in the second component molding process described above. The upper case 16 can also be obtained by this manufacturing method.

[0061] Then, for example, the circuit board 12 is brought close to the upper case 16 manufactured as described above from below and fixed with screws. As a result, one end (lower end) of each connection terminal 60 and connection terminal 66 that protrudes downward from the upper case 16 is inserted into each through-hole 28 in the circuit board 12. Each connection terminal 60 and connection terminal 66 inserted into each through-hole 28 may be electrically connected to the circuit board 12 by solder or the like (not shown). Furthermore, the upper case 16 with the circuit board 12 assembled is brought close to the separately formed lower case 18 from above, and with the upper case 16 covering the upper opening 19 of the lower case 18, the upper case 16 and the lower case 18 are fixed together with screws, for example. As a result, the entire second component 22 is formed by the upper bottom wall 36 and the lower case 18, and a case 14 containing the circuit board 12 is formed inside, completing the electrical connection box 10.

[0062] In the resin molded product (electrical connection box 10) of Embodiment 1, which has the structure described above, a thermoplastic elastomer 26 is provided between a first component 20 made of synthetic resin and a second component 22 made of synthetic resin. This configuration not only welds the first component 20 and the second component 22 together, but also welds the first component 20 to the thermoplastic elastomer 26 and the second component 22 to the thermoplastic elastomer 26. More specifically, the first component 20 has an embedded portion 24 that is embedded in the second component 22, and a thermoplastic elastomer 26 is placed between the opposing surfaces (outer surfaces 55, 73 and inner surfaces 78, 82) of the embedded portion 24 and the second component 22, thereby welding not only the embedded portion 24 to the second component 22, but also the embedded portion 24 to the thermoplastic elastomer 26 and the second component 22 to the thermoplastic elastomer 26. As a result, the first component 20 and the thermoplastic elastomer 26, and the second component 22 and the thermoplastic elastomer 26 are fused together, and water intrusion from between them can be prevented more reliably than when the first component 20 and the second component 22 are simply welded together. In other words, when fixing the first component and the second component, if the second component is simply molded integrally with the first component as an insert, the interfaces between them will not be completely welded together, and there is a risk of water intrusion from their opposing surfaces. However, by adopting the above configuration, water intrusion through the opposing surfaces can be prevented, and problems such as an increase in the number of parts and assembly steps, as in conventional structures, can also be eliminated. Note that the first component 20 and the thermoplastic elastomer 26 do not necessarily have to be welded together; they may be formed separately and assembled afterwards.

[0063] An annular groove 54 surrounding the waterproof area 23 is formed on the surface (outer surface 55, 73) facing the second part 22 in each embedded section 24, and thermoplastic elastomer 26 is filled into each groove 54. As a result, in the primary molded product 84 in which the first part 20 and the thermoplastic elastomer 26 are integrally formed, the thermoplastic elastomer 26 does not protrude significantly to the outside, making it easier to handle the primary molded product 84 when molding the second part 22 using the primary molded product 84 as an insert, and enabling stable molding of the second part 22.

[0064] In Embodiment 1, a plurality of first components 20 are provided, some of which are connector mounting portions 32, and the second component 22 is the upper bottom wall portion 36 of the upper case 16 and the lower case 18 that constitute the case 14. Thus, an electrical junction box 10 equipped with a plurality of connector mounting portions 32 is constructed as a resin molded product comprising the first component 20 and the second component 22. That is, when providing the connector mounting portions 32 in the electrical junction box 10, an opening 40 that penetrates in the thickness direction is formed in the upper bottom wall portion 36, but by fixing the connector mounting portion 32 (embedded portion 24) to this opening 40 which is a waterproof area 23, the intrusion of water through the opening 40 can be effectively prevented.

[0065] Furthermore, in Embodiment 1, the connector mounting portion 32 has a terminal retaining wall 58, and a plurality of connection terminals 60 are fixedly held in the terminal retaining wall 58. In particular, in Embodiment 1, each connection terminal 60 is integrally molded with the connector mounting portion 32 as an insert part. This makes it possible to form the connector mounting portion 32 having each connection terminal 60 inside in a single molding process. Therefore, by molding the second part 22 with this connector mounting portion 32 as an insert part, the upper case 16, and thus the electrical connection box 10, which has each connection terminal 60 in the connector mounting portion 32, can be easily manufactured.

[0066] Furthermore, in Embodiment 1, one of the first components 20 is a terminal block 34. As a result, an electrical junction box 10 equipped with a terminal block 34 is constructed as a resin molded product comprising the first component 20 and the second component 22. That is, when providing the terminal block 34 to the electrical junction box 10, a through-hole 42 through which the connection terminal 66 is inserted is formed in the upper bottom wall portion 36. By fixing the terminal block 34 (embedded portion 24) to this through-hole 42 which is a waterproof area 23, the intrusion of water through the through-hole 42 can be effectively prevented.

[0067] In addition, in the manufacture of the primary molded product 84 which integrally comprises the first component 20 and the thermoplastic elastomer 26, the first component 20 may be made as an insert part using insert molding, or the thermoplastic elastomer 26 may be made as an insert part using insert molding.

[0068] <Embodiment 2> Next, the electrical junction box 90, which is a resin molded product of Embodiment 2 of this disclosure, will be described with reference to Figure 6. The basic structure of the electrical junction box 90 in Embodiment 2 is the same as that of the electrical junction box 10 in Embodiment 1. However, in Embodiment 1, the connector mounting portion 32 as the first component 20 was formed as an integrally molded product equipped with each connection terminal 60, whereas in Embodiment 2, the connector mounting portion 92 as the first component 20 is formed separately from each connection terminal 60. In the following, the differences from Embodiment 1 will be mainly described, and detailed explanations of components or parts that are substantially the same as those in Embodiment 1 will be omitted by denoting them with the same reference numerals in the figures as in Embodiment 1.

[0069] The connector mounting portion 92 of Embodiment 2 is provided with a hood portion 52 that protrudes upward from the electrical connection box 90 (upper case 93). The hood portion 52 is provided with a terminal retaining wall 58 that divides the case 14 into an inward side (downward side) and an outward side (upward side). This terminal retaining wall 58 widens horizontally in the vertical middle portion on the inner circumference side of the hood portion 52. The terminal retaining wall 58 is provided with a plurality of insertion holes 94 that allow insertion of each connection terminal 60 protruding to the inward side (downward side) and outward side (upward side) of the case 14. In a plan view, each insertion hole 94 is, for example, rectangular in shape and is larger than the planar shape (for example, rectangular) of each connection terminal 60. As a result, as shown in Figure 6, when each connection terminal 60 is inserted into each insertion hole 94, each connection terminal 60 does not come into contact with the inner surface of each insertion hole 94.

[0070] In manufacturing the electrical junction box 90 with the structure described above, first, the connector mounting portion 92 as the first component 20 is formed by injection molding. Then, using the connector mounting portion 92 as an insert, thermoplastic elastomer 26 is filled into the groove 54 provided in the embedded portion 24 of the first component 20 and molded. This gives a primary molded product 84 in which the connector mounting portion 92 and the thermoplastic elastomer 26 are integrally molded. Furthermore, by molding the second component 22 (upper bottom wall portion 36) using this primary molded product 84 as an insert, the upper case 93 in Embodiment 2 is obtained. The terminal block 34 is formed in the same manner as in Embodiment 1, and when manufacturing the upper case 93, one end of the connection terminal 66 protrudes downward from the upper case 83.

[0071] Furthermore, when manufacturing the electrical junction box 90 using the upper case 93 in Embodiment 2, first, a circuit board 12 equipped with connection terminals 60 protruding upward is prepared. Specifically, one end (lower end) of each connection terminal 60 is inserted from above into each through-hole 28 of the circuit board 12, and each connection terminal 60 is fixed to the circuit board 12 with solder or the like (not shown), and the electrical circuit on the circuit board 12 and each connection terminal 60 are electrically connected. After that, the circuit board 12 equipped with each connection terminal 60 is brought close to the upper case 93 manufactured as described above from below, and the other end (upper end) of each connection terminal 60 is inserted into each insertion hole 94 in the terminal holding wall 58. Also, the connection terminals 66 protruding downward from the upper case 93 are inserted into the through-hole 28 of the circuit board 12 and fixed and electrically connected with solder or the like. Then, the circuit board 12 is fixed to the upper bottom wall 36, for example, with screws.

[0072] As a result, the other end (upper end) of each connection terminal 60 protrudes above the terminal holding wall 58 on the inner circumference side of the hood portion 52 and is exposed to the outside. Furthermore, the upper case 93, to which the circuit board 12 is assembled as described above, is brought closer from above to the separately formed lower case 18, and with the upper case 93 covering the upper opening 19 of the lower case 18, the upper case 93 and the lower case 18 are fixed together, for example, with screws. This gives rise to the electrical connection box 90 using the upper case 93 in Embodiment 2.

[0073] Each connector mounting portion 92, which has the structure described above, can also be connected to a female connector (not shown) that is the mating connector, similar to Embodiment 1. Furthermore, since the electrical connection box 90 of Embodiment 2 differs from the electrical connection box 10 of Embodiment 1 only in the way in which each connection terminal 60 is held, it can achieve the same effects as Embodiment 1.

[0074] <Variation> While Embodiments 1 and 2 have been described in detail above as specific examples of the present disclosure, the present disclosure is not limited by these specific descriptions. Modifications, improvements, etc., to the extent that they can achieve the objectives of the present disclosure are included in the present disclosure. For example, the following modifications of embodiments are also included in the technical scope of the present disclosure.

[0075] (1) In the embodiments 1 and 2 described above, the first component 20 was made up of connector mounting parts 32 and 92 and terminal blocks 34, and the second component 22 was made up of an upper bottom wall 36 and a lower case 18, and the resin molded product comprising these first component 20 and second component 22 was made up of an electrical connection box 10 and 90, but the invention is not limited to this embodiment. Also, in the embodiments 1 and 2 described above, the second component 22 (upper bottom wall 36) was integrally molded with a primary molded product 84 (first component 20 and thermoplastic elastomer 26) as an insert, but the invention is not limited to this embodiment. Furthermore, in the embodiments 1 and 2 described above, the first component 20 was made up of connector mounting parts 32 and 92 and terminal blocks 34, but the invention is not limited to this embodiment, and the specific embodiments of the first component and the second component are not limited as long as the embedded portion of the first component surrounds the periphery of the waterproof area of ​​the second component.

[0076] For example, the second component may consist only of the upper bottom wall portion, and the upper case may be a resin molded product comprising the first component (each connector mounting portion and terminal block) and the second component. Alternatively, the upper bottom wall portion may be the first component. That is, the upper bottom wall portion may be the first component, and a primary molded product may be manufactured by integrally molding the first component (upper bottom wall portion) and a thermoplastic elastomer. Subsequently, the upper case may be manufactured as a resin molded product by molding the connector mounting portion, which is the second component, using the primary molded product and connection terminals as inserts. In that case, in the connector mounting portion, for example, the lower opening of the hood portion, which is roughly cylindrical, is made into a waterproof area. The upper bottom wall portion, which is the first component, is provided with an embedded portion surrounding the waterproof area, and a receiving recess is formed in the connector mounting portion, which is the second component, to accommodate the embedded portion, and the thermoplastic elastomer may be provided so as to be located between the opposing surfaces of the embedded portion and the receiving recess.

[0077] Furthermore, the upper bottom wall and the lower case may be integrated into a single first component. For example, a circuit board with protruding connection terminals may be fixed to the lower part of the upper bottom wall with screws, and the upper bottom wall and the lower case may be fixed together with screws or the like. Then, a primary molded product is manufactured by integrally molding this first component (upper bottom wall and lower case) with a thermoplastic elastomer. Subsequently, as described above, the connector mounting portion, which is the second component, may be molded using the primary molded product as an insert, thereby forming an electrical connection box as a resin molded product.

[0078] (2) In the first embodiment, each connection terminal 60 and each connector mounting portion 32 were integrally molded so that each connection terminal 60 was fixedly held by the terminal retaining wall 58 of each connector mounting portion 32. However, each connection terminal and each connector mounting portion may be formed separately, and each connection terminal may be press-fitted into a through hole provided in the terminal retaining wall of each connector mounting portion so that each connection terminal is fixedly held by the terminal retaining wall of each connector mounting portion.

[0079] (3) In embodiments 1 and 2 described above, each groove 54 and the thermoplastic elastomer 26 placed within each groove 54 were provided in the radial central portion of each embedded portion 24, but the embodiment is not limited to this configuration. These grooves and thermoplastic elastomers only need to be provided between the opposing surfaces of the embedded portion and the second component (retaining recess). For example, the grooves and thermoplastic elastomers may be provided on the inner circumferential surface of the embedded portion, or on the outer circumferential surface of the embedded portion.

[0080] (4) The circuit board is not limited to being fixed to the upper case, but may also be fixed to the lower case. Furthermore, the upper case and the lower case are not limited to being fixed together by screws, but may also be fixed together by, for example, a known locking mechanism. [Explanation of symbols]

[0081] 10. Electrical junction box (resin molded product in Embodiment 1) 12 Circuit boards 14 cases 16 Upper Case 18 Lower Case 19 Upper opening 20 Part 1 22 Part 2 23 Waterproof Area 24 Buried section 26 Thermoplastic elastomers 28 through-holes 32 Connector mounting section 34 Terminal block 36 Upper bottom wall 40 openings 42 Penetration section 44 Bottom wall section 46 Lower peripheral wall 52 Food section 54 groove 55 Outer surface (opposing surface) 58 Terminal retaining wall 60 connection terminals 64 Terminal fastening section 66 Connection terminals 68 Terminal base 70 bolt insertion holes 72 Stud bolts 73 Outer surface (opposing surface) 76 Containment Depression 78 Inner surface (opposite surface) 80 Containment Depression 82 Inner surface (opposite surface) 84 Primary molded products 86 Assembly body 90 Electrical junction box (resin molded product in Embodiment 2) 92 Connector mounting section 93 Upper Case 94 Through hole

Claims

1. The first component is made of synthetic resin, It comprises a second component made of synthetic resin, The first component is integrated with the second component, having an embedded portion that surrounds the waterproof area of ​​the second component and is embedded in the second component. A resin molded product in which a waterproof thermoplastic elastomer is placed and welded between the embedded portion and the opposing surface of the second component.

2. An annular groove is formed on the surface of the embedded portion facing the second component, surrounding the periphery of the waterproof area. The resin molded article according to claim 1, wherein the thermoplastic elastomer is disposed in the groove.

3. The second component includes a case that houses a circuit board inside, The first component includes a connector mounting portion provided in the opening of the case which serves as the waterproof area, The connector mounting portion has a hood portion that protrudes onto the case and an embedded portion that extends in a flange-like manner towards the base end of the hood portion. The resin molded article according to claim 2, wherein the thermoplastic elastomer filled in the annular groove provided in the embedded portion is arranged to surround the periphery of the opening.

4. The resin molded product according to claim 3, wherein the connector mounting portion has a terminal retaining wall that divides the hood portion into an inner side and an outer side of the case, and includes a connecting terminal that penetrates the terminal retaining wall and protrudes to the inner side and the outer side of the case, and the connecting terminal is fixedly held by the terminal retaining wall.

5. The resin molded product according to claim 3, wherein the connector mounting portion has a terminal retaining wall that divides the hood portion into an inner side and an outer side of the case, and the terminal retaining wall is provided with an insertion hole that allows the insertion of a connecting terminal protruding to the inner side and the outer side of the case.

6. The second component includes a case that houses a circuit board inside, The first component includes a terminal block having a connecting terminal having one end connected to the circuit board and the other end having a terminal fastening portion, and a terminal base that holds the connecting terminal with the terminal fastening portion exposed above the waterproof area, The waterproof area includes a penetration through which the intermediate portion of the connection terminal passes, The resin molded product according to claim 2, wherein the embedded portion is formed by the peripheral edge of the base end of the terminal base, and the thermoplastic elastomer filled in the annular groove provided in the embedded portion is arranged to surround the periphery of the through portion.

7. A method for manufacturing a resin molded article according to claim 1, A first part molding step in which the first part is injection molded, A primary molded product molding process is performed in which the first part molded in the first part molding process is used as an insert part, and the first part and the thermoplastic elastomer for waterproofing are integrally molded to form a primary molded product, A method for manufacturing a resin molded product, comprising: a second component molding step of injection molding the second component using the primary molded product as an insert, such that the thermoplastic elastomer is positioned between the embedded portion of the first component and the opposing surface of the second component.

8. A method for manufacturing a resin molded article according to claim 1, A thermoplastic elastomer molding process for injection molding the aforementioned thermoplastic elastomer, A primary molded product molding process is performed in which the thermoplastic elastomer molded in the thermoplastic elastomer molding process is used as an insert, and the thermoplastic elastomer and the first component are integrally molded to form a primary molded product. A method for manufacturing a resin molded product, comprising: a second component molding step of injection molding the second component using the primary molded product as an insert, such that the thermoplastic elastomer is positioned between the embedded portion of the first component and the opposing surface of the second component.

9. A method for manufacturing a resin molded article according to claim 1, A first part molding step in which the first part is injection molded, A thermoplastic elastomer molding process for injection molding the aforementioned thermoplastic elastomer, An assembly step of assembling the first component and the thermoplastic elastomer such that the thermoplastic elastomer is positioned between the embedded portion of the first component and the opposing surface of the second component, A method for manufacturing a resin molded product, comprising: a second part molding step of injection molding the second part using the assembly of the first part and the thermoplastic elastomer assembled in the assembly step as an insert product.

10. The first component has an annular groove formed on the surface of the embedded portion facing the second component, surrounding the periphery of the waterproof area. A method for manufacturing a resin molded product according to any one of claims 7 to 9, wherein the primary molded product or the assembly in which the thermoplastic elastomer is placed in the groove of the embedded portion is used as an insert product, and the second part molding step is performed.

Images