Electrical Junction Box

Abstract

To provide an electric connection box excellent in workability of assembly.SOLUTION: An electric connection box A includes a base member 10 to which an electrical component 58 is attached, and a plate 28 connected to the electrical component 58, the base member 10 includes an accommodation space 25 accommodating a plate 28, and an opening 27 that opens the accommodation space 25 to the outer surface of the base member 10, and the base member 10 is formed with a detachment restricting portion 34 that restricts the plate 28 in the accommodation space 25 from being detached from the opening 27.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to an electrical junction box. [Background technology]

[0002] Patent Document 1 discloses an electrical connection box in which a bus bar is attached to a resin electronic component block. When attaching the bus bar to the electronic component block, a surface pressing tool is used to press the bus bar. Electronic component block Push it into the busbar assembly section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-080587 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned electrical connection box, the busbar is pressed strongly against the busbar attachment portion so that a surface pressing jig must be used. The need for strong pressing is presumed to be due to the frictional resistance of the press-fit structure that holds the busbar in the attached state. However, the task of using a surface pressing jig to press strongly against the friction places a heavy burden on the worker.

[0005] One possible solution to this problem is to have the busbar drop under its own weight into a groove formed in the electrical component block and then block the opening of the groove with a separate member. However, with this structure, if the electrical junction box is turned upside down without the opening of the groove being blocked with a separate member, the busbar will fall due to gravity, requiring the worker to block the opening with his or her hand, which still leaves room for problems in terms of assembly workability.

[0006] The electrical junction box of the present disclosure has been completed in view of the above circumstances, and has an object to provide an electrical junction box that is easy to assemble. [Means for solving the problem]

[0007] The electrical connection box of the present disclosure comprises: A base member on which electrical components are mounted; a connection member connected to the electrical component, the base member has an accommodation space that accommodates the connection member and an opening that opens the accommodation space to an outer surface of the base member, The base member is formed with a removal prevention portion that prevents the connection member in the accommodation space from removing from the opening. Effect of the Invention

[0008] According to the present disclosure, it is possible to provide an electrical junction box that is easy to assemble. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of an electrical junction box according to a first embodiment. [Diagram 2] FIG. 2 is a perspective view showing a state in which the electrical junction box is separated into a base member and a side wall member. [Diagram 3] FIG. 3 is a perspective view showing a state in which an electric component is attached to a base member. [Figure 4] FIG. 4 is a perspective view showing a state in which the base member is separated into a holding member, a terminal block, and a connection member. [Diagram 5] FIG. 5 is a perspective view illustrating a state in which the side wall member is separated into a side wall main body and a bus bar. [Figure 6] FIG. 6 is a partially enlarged side view illustrating a state in which the separation of the connecting member is restricted by the separation restricting portion. [Figure 7] FIG. 7 is a partially enlarged front view illustrating a state in which the separation of the connecting member is restricted by the separation restricting portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. The electrical connection box of the present disclosure comprises: (1) A base member to which an electric component is attached and a connecting member to be connected to the electric component, the base member having a storage space for storing the connecting member and an opening that opens the storage space to an outer surface of the base member, the base member being formed with a detachment prevention part that prevents the connecting member in the storage space from detaching from the opening. According to the configuration of the present disclosure, even if the base member is in a position in which the opening faces downward, the connecting member is held in a state stored in the storage space by the detachment prevention part, and therefore, the workability is excellent when assembling other components to the base member and the connecting member.

[0011] (2) It is preferable that the base member includes a holding member that holds the electrical component and a terminal block to which the connection member is fixed, and the space between the holding member and the terminal block functions as the accommodation space. According to this configuration, when assembling the holding member and the terminal block, the connection member can be sandwiched between the holding member and the terminal block to accommodate the connection member in the accommodation space. Since the assembly of the base member and the assembly of the connection member to the base member can be performed simultaneously in a single process, the assembly workability is excellent.

[0012] (3) In (2), it is preferable that the holding member is capable of holding a larger number of the electric components than the connecting member, and the removal prevention portion is formed only on the terminal block. The holding member has a complex shape because it needs a structure for holding a plurality of electric components. Therefore, the removal prevention portion is formed on the terminal block, which has a simpler shape than the holding member. This makes it possible to avoid the shape of the holding member becoming complicated due to the formation of the removal prevention portion, and to reduce the cost of a mold for molding the holding member.

[0013] (4) A bus bar includes a base portion, a quarter-circular arc-shaped bent portion extending from the base portion, and a connecting plate portion extending from the bent portion in a direction perpendicular to the base portion, the connecting plate portion being overlapped with the connecting member, and the bent portion being The connecting member It is preferable that the detachment prevention portion is disposed facing the outer surface of the connecting member and the bent portion, and the detachment prevention portion is disposed between the connecting member and the bent portion. According to this configuration, since the detachment prevention portion is disposed in the dead space between the connecting member and the bent portion, a dedicated space for disposing the detachment prevention portion is not required.

[0014] (5) It is preferable that the base member has a component housing chamber for housing the electric component, the component housing chamber being open to a side of the base member, a sidewall member being attached to the base member for closing the side open surface of the component housing chamber, and the sidewall member covering the opening of the housing space. With this configuration, the sidewall member can reliably prevent the connection member from coming off the housing space.

[0015] [Details of the embodiment of the present disclosure] [Example 1] A first embodiment of the electrical junction box of the present disclosure will be described with reference to Figs. 1 to 7. The present invention is not limited to these examples, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. In this first embodiment, the front and rear directions of the electrical junction box A are defined as the diagonally lower left in Figs. 1 to 5 and the left in Fig. 6. The up and down directions are defined as the upward and downward directions as they appear in Figs. 1 to 7. The left and right directions are defined as the direction perpendicular to the paper surface of Fig. 6, and the left and right directions as they appear in Fig. 7.

[0016] <Outline of Electrical Junction Box A> As shown in Figures 1 and 2, the electrical junction box A of the present embodiment 1 includes a base member 10 and a pair of side wall members 11 that are symmetrical on the left and right. The pair of side wall members 11 are assembled to the base member 10 so as to sandwich the base member 10 from the left and right. As shown in Figure 1, the electrical junction box A has a component accommodating chamber 12 that is partitioned by the base member 10 and the pair of side wall members 11. The component accommodating chamber 12 is open to the top surface of the electrical junction box A. A plurality of electrical components 58 (see Figure 3), such as fusible links, are accommodated within the component accommodating chamber 12.

[0017] A pair of left and right front fitting portions 13 are formed at the front end of the base member 10, and a pair of left and right rear fitting portions 14 are formed at the rear end of the base member 10. As shown in Figures 2 and 5, a pair of left and right front fitting portions 15 are formed at the front end of the sidewall member 11, and a pair of left and right rear fitting portions 16 are formed at the rear end of the sidewall member 11. The base member 10 and the sidewall member 11 are held in an assembled state by the fitting of the front fitting portions 13 with the front fitting portions 15 and the fitting of the rear fitting portions 14 with the rear fitting portions 16.

[0018] <Base member 10> The base member 10 includes a synthetic resin holding member 17, a synthetic resin terminal block 21 that is a separate part from the holding member 17, and a pair of plates 28 that are symmetrical with respect to the left and right of the connecting parts. The number of electrical parts 58 attached to the base member 10 is greater than the number of plates 28. The holding member 17 is a single part that includes a rectangular body portion 18 with its long sides facing the front-rear direction, a front plate portion 19 that extends upward from the front edge of the body portion 18, and a rear plate portion 20 that extends upward from the rear edge of the body portion 18. The space surrounded by the upper surface of the body portion 18, the rear surface of the front plate portion 19, and the front surface of the rear plate portion 20 functions as a part storage chamber 12. When the sidewall member 11 is not attached to the base member 10, the part storage chamber 12 is open to the outside of the base member 10 at the upper surface of the base member 10 and both the left and right side surfaces of the base member 10. A pair of rear fitting portions 14 are formed on both left and right ends of the rear plate portion 20 .

[0019] As shown in Fig. 4, the terminal block 21 is a single component having a support plate portion 22 whose thickness direction faces the front-rear direction, and a receiving plate portion 23 whose thickness direction faces the up-down direction. The receiving plate portion 23 is formed with bolt holes 24 that penetrate vertically. A pair of front fitting portions 13 are formed on both left and right ends of the terminal block 21. The terminal block 21 is attached to the holding member 17 so that the support plate portion 22 covers the front surface of the front plate portion 19.

[0020] As shown in Fig. 6, a pair of left and right storage spaces 25 are formed between the front plate portion 19 of the holding member 17 and the support plate portion 22 of the terminal block 21. The pair of storage spaces 25 are arranged side by side on the left and right sides of a partition wall portion 26 (see Fig. 4). The storage spaces 25 are opened as slit-shaped openings 27 in the vertical direction on both the left and right outer surfaces of the base member 10. The upper end of the storage space 25 is opened in the form of a slit in the horizontal direction toward the front of the base member 10.

[0021] As shown in FIG. 4, the plate 28 is a single part formed by bending a long and narrow metal plate at a right angle. The plate 28 has a plate-shaped power supply part 29 and a plate-shaped mounting part 30 that are connected at a right angle to each other. The plate-shaped power supply part 29 is flat with its thickness direction facing the front-rear direction. The front view of the plate-shaped power supply part 29 is a rectangle with its long side facing the up-down direction. The plate-shaped power supply part 29 is formed with a power supply connection hole 31 that penetrates in the front-rear direction. The plate-shaped mounting part 30 is flat with its thickness direction facing the up-down direction, and extends forward from the upper edge of the plate-shaped power supply part 29. The plan view of the plate-shaped mounting part 30 is a square shape. The plate-shaped mounting part 30 is formed with a mounting hole 32 that penetrates in the up-down direction.

[0022] As shown in Fig. 6, plate 28 is attached to base member 10 with plate-shaped power supply portion 29 accommodated in accommodation space 25. When plate 28 is attached to base member 10, plate-shaped mounting portion 30 is exposed forward and outward from the upper end of accommodation space 25 and is placed on receiving plate portion 23 of terminal block 21. This restricts plate 28 from moving downward relative to base member 10, i.e., terminal block 21. A retaining protrusion 33 protruding from front plate portion 19 abuts against the upper end of plate-shaped power supply portion 29, i.e., the rear end of plate-shaped mounting portion 30. This restricts plate 28 from moving upward relative to terminal block 21.

[0023] The edge of the power supply connection hole 31 of the plate-shaped power supply portion 29 is exposed to the outside of the terminal block 21 on the front surface of the support plate portion 22. A power supply terminal (not shown) connected to a battery (not shown) is connected to the plate-shaped power supply portion 29 using the power supply connection hole 31.

[0024] At the opening 27 of the accommodation space 25, the entire outer surface of the plate-shaped power supply unit 29 is exposed. Therefore, there is a concern that the plate 28 in the accommodation space 25 may slide left and right and come off from the opening 27 to the outside of the base member 10. As a countermeasure, a separation prevention portion 34 is provided on the receiving plate portion 23 on which the plate-shaped mounting portion 30 is placed. As shown in Figs. 4, 6, and 7, the separation prevention portion 34 is disposed on the side edge on the opening 27 side of both left and right sides of the receiving plate portion 23, and has a rib shape that is elongated in the front-rear direction. The separation prevention portion 34 protrudes upward from the receiving plate portion 23 and is disposed so as to face the plate-shaped mounting portion 30 from the outside in the left and right direction. Even if the plate-shaped power supply unit 29 in the accommodation space 25 tries to come off from the opening 27 to the outside in the left and right direction, the plate-shaped mounting portion 30 abuts against the separation prevention portion 34, thereby preventing the plate-shaped power supply unit 29 from coming off. As a result, the plate 28 is held in a state where it is assembled to the base member 10.

[0025] <Side wall member 11> The sidewall member 11 is configured by assembling a sidewall main body 40 made of synthetic resin and a busbar 41 made of metal. The sidewall main body 40 is a single component that is elongated in the front-to-rear direction in a plan view and has a wall thickness direction oriented in the left-to-right direction. Inside the sidewall main body 40, one busbar accommodating chamber (not shown), multiple cavities (not shown), and multiple fuse accommodating chambers 42 are formed. The busbar accommodating chamber is a narrow space whose left-to-right dimension is smaller than its front-to-rear and top-to-bottom dimensions. The busbar accommodating chamber opens in the shape of a slit in the front-to-rear direction on the underside of the sidewall main body 40. A busbar 41 is attached to the busbar accommodating chamber.

[0026] The busbar 41 is a single component formed by bending a metal plate punched into a predetermined shape. As shown in FIG. 5, the busbar 41 has one flat board portion 43 with its plate thickness oriented in the left-right direction, one flat heat sink portion 44, multiple tabs 45, and one connection plate portion 46. In a side view of the busbar 41 seen from the left-right direction, the board portion 43 and the heat sink portion 44 form a rectangle. The heat sink portion 44 is disposed so as to overlap the inner surface of the board portion 43. The lower end of the board portion 43 and the lower end of the heat sink portion 44 are connected via a folded portion 47 having a U-shaped cross section. The multiple tabs 45 protrude upward from the upper edge of the board portion 43 and are disposed so as to be spaced apart in the front-rear direction.

[0027] The substrate portion 43 includes a support portion 48 that protrudes flush forward from the front edge of the substrate portion 43. The connection plate portion 46 is flat and supported on the upper edge of the support portion 48 via a bent portion 49. In a front view of the busbar 41 from the front, the bent portion 49 is in the shape of a quarter circle. The lower end of the bent portion 49 and the upper end of the support portion 48 are connected tangentially. The bent portion 49 protrudes from the support portion 48 inward from the substrate portion 43, that is, toward the base member 10 side from the substrate portion 43 in the left-right direction. The connection plate portion 46 extends tangentially inward from the protruding end of the bent portion 49. The connection plate portion 46 is supported in a horizontal direction and is perpendicular to the substrate portion 43. The connection plate portion 46 has a through hole 50 that penetrates in the up-down direction.

[0028] The busbar 41 is attached to the sidewall main body 40 with the substrate portion 43, the heat sink portion 44, and the tab 45 housed in the busbar accommodating chamber. The connection plate portion 46 of the busbar 41 is exposed to the outside of the sidewall main body 40 and protrudes inward in the left-right direction from the sidewall main body 40, i.e., toward the base member 10. The connection plate portion 46 is placed on the upper surface of the plate-shaped mounting portion 30 of the plate 28.

[0029] A wide widened portion 51 is formed at the upper end of the sidewall main body 40. In the widened portion 51, a plurality of fuse accommodating chambers 42 that open to the upper surface of the sidewall main body 40 are arranged in a line in the front-rear direction. The lower ends of the plurality of fuse accommodating chambers 42 communicate with the busbar accommodating chamber. A fuse 52 is attached to the fuse accommodating chamber 42 from above the sidewall member 11. One lead 53 of the fuse 52 is connected to the tab 45 of the busbar 41. In the lower end region of the widened portion 51, a plurality of cavities that open to the lower surface of the sidewall main body 40 are arranged in a line in the front-rear direction. The upper ends of the plurality of cavities are individually connected to the lower ends of the plurality of fuse accommodating chambers 42. A harness terminal 55 that is individually connected to a plurality of electric wires 54 that constitute a wire harness is accommodated in each cavity. The harness terminal 55 is connected to the other lead 53 of the fuse 52.

[0030] <Electrical junction box A assembly procedure> When assembling the electrical junction box A, the holding member 17 and the terminal block 21 are left separated as shown in Fig. 4. In this state, the plate-shaped mounting portion 30 is placed on the receiving plate portion 23, and the plate 28 is temporarily held to the terminal block 21 with the plate-shaped power supply portion 29 overlapping the rear surface of the terminal block 21. Next, the terminal block 21 and the plate 28 are assembled by being pressed into the holding member 17 from below. By assembling the terminal block 21 to the holding member 17, the accommodation space 25 is formed, and the plate-shaped power supply portion 29 of the plate 28 is accommodated in the accommodation space 25, completing the assembly of the base member 10.

[0031] After the base member 10 is assembled, the electric component 58 is attached to the holding member 17 so as to be accommodated in the component housing chamber 12 from above the base member 10. As shown in Fig. 3, the component housing chamber 12 is open on both the left and right sides of the base member 10, so that if an operator picks up the electric component 58 from the left and right, the fingers holding the electric component 58 will not interfere with the base member 10. Electrical Components 58 When the electric component 58 is attached by an automatic machine, if the electric component 58 is held by the fingers of the automatic machine so as to sandwich the electric component 58 from the left and right, the fingers will not interfere with the base member 10.

[0032] When the sidewall members 11 are not attached to the base member 10, the entire area of ​​the accommodation space 25 is open as an opening 27 on the outer surface of the base member 10. Therefore, there is a concern that the plate-shaped power supply part 29 may fall out of the opening 27 when the base member 10 is tilted so that the side surface faces downward. However, the terminal block 21 is formed with a separation prevention part 34 that prevents the plate-shaped mounting part 30 from shifting in the left-right direction, so that the plate 28 will not come out of the holding member 17 and the terminal block 21 even if the base member 10 is tilted.

[0033] Thereafter, when the pair of side wall members 11 are assembled to the base member 10, the component housing chamber 12 is covered from both the left and right sides by the side wall members 11, completing the assembly of the electrical junction box A. The component housing chamber 12 is surrounded all around from the front-rear and left-right directions.

[0034] In a state where the side wall member 11 is assembled to the base member 10, the front end of the side wall member 11 is positioned so as to cover the opening 27 of the accommodation space 25. The connection plate portion 46 of the bus bar 41 is placed on the upper surface of the plate-shaped mounting portion 30 of the plate 28. Bolts (not shown) pass through the through holes 50, the mounting holes 32, and the bolt holes 24. The plate 28 and the bus bar 41 are fixed to the terminal block 21 by screwing and tightening the bolts into nuts (not shown) provided on the lower surface of the receiving plate portion 23. As shown in FIG. 7, the bent portion 49 extending obliquely downward from the connection plate portion 46 and the upper end portion of the support portion 48 are positioned so as to cover the entire removal prevention portion 34 from above and from the sides.

[0035] <Actions and Effects of the Examples> The electric junction box A of this embodiment includes a base member 10 to which an electric component 58 is attached, and a plate 28 connected to the electric component 58. The base member 10 has an accommodation space 25 that accommodates at least a part of the plate 28, and an opening 27 that opens the accommodation space 25 to the outer surface of the base member 10. The base member 10 is formed with a removal restriction portion 34 that restricts the plate 28 in the accommodation space 25 from removing from the opening 27. Even if the base member 10 is in a position in which the opening 27 faces downward, the plate 28 is maintained in a state of being accommodated in the accommodation space 25 by the removal restriction portion 34. Therefore, the electric junction box A of this embodiment is excellent in workability when assembling other components to the base member 10 and the plate 28.

[0036] The base member 10 includes a holding member 17 that holds an electric component 58, and a terminal block 21 to which the plate 28 is fixed. The space between the holding member 17 and the terminal block 21 functions as an accommodation space 25. When assembling the holding member 17 and the terminal block 21, the plate 28 can be sandwiched between the holding member 17 and the terminal block 21, so that the plate 28 can be accommodated in the accommodation space 25. The assembly of the base member 10 and the assembly of the plate 28 to the base member 10 can be performed simultaneously in a single process, resulting in excellent assembly workability.

[0037] The holding member 17 can hold a larger number of electrical components 58 than the plate 28. The removal restricting portion 34 is not formed on the holding member 17, but is formed only on the terminal block 21. The holding member 17 needs a structure for holding a larger number of electrical components 58 than the plate 28, and therefore has a more complex shape than the terminal block 21. Therefore, the removal restricting portion 34 is formed only on the terminal block 21, which has a simpler shape than the holding member 17. This makes it possible to avoid the shape of the holding member 17 becoming complicated due to the formation of the removal restricting portion 34, and reduces the cost of the mold for molding the holding member 17.

[0038] Busbar 41 has a base plate portion 43, a quarter-circular bent portion 49 extending from base plate portion 43, and a connecting plate portion 46 extending from bent portion 49 in a direction perpendicular to base plate portion 43. Busbar 41 is disposed with connecting plate portion 46 overlapping the upper surface of plate-shaped mounting portion 30 of plate 28, and bent portion 49 facing the outer surface of plate 28 with a gap therebetween in the left-right direction. Separation prevention portion 34 is disposed between plate-shaped mounting portion 30 of plate 28 and bent portion 49. Since separation prevention portion 34 is disposed in the dead space between plate 28 and bent portion 49, no dedicated space is required for disposing separation prevention portion 34.

[0039] The base member 10 has a component housing chamber 12 that houses an electric component 58. The component housing chamber 12 is open to both the left and right sides of the base member 10. A pair of side wall members 11 that close the lateral open faces of the component housing chamber 12 are attached to the base member 10. The side wall members 11 cover the opening 27 of the housing space 25. With this configuration, the side wall members 11 can also reliably prevent the plate 28 from coming out of the housing space 25.

[0040] [Other Examples] The present invention is not limited to the embodiments described above and shown in the drawings, but is indicated by the claims. The present invention includes the equivalent meaning of the claims and all modifications within the scope of the claims, and is intended to include the following embodiments. In the above-mentioned embodiment 1, the assembly of the base member and the assembly of the connecting member to the base member are performed simultaneously in one step, but the connecting member may be assembled to the base member after the base member is assembled. In the above-mentioned first embodiment, the separation prevention portion is formed only on the terminal block, but the separation prevention portion may be formed only on the holding member, or may be formed on both the terminal block and the holding member. In the above-mentioned first embodiment, the separation prevention portion is disposed in the dead space between the connection member and the bent portion, but the separation prevention portion may be disposed at a position other than the dead space between the connection member and the bent portion. In the above-mentioned first embodiment, the opening of the accommodation space is blocked by the side wall member, but the opening of the accommodation space may be left open. [Explanation of symbols]

[0041] A…Electrical junction box 10...Base member 11...Side wall member 12... Parts storage room 13…Front side fitting part 14...Rear side fitting part 15…Front fitting part 16…Rear fitting part 17...Retaining member 18…Main body 19...Front plate part 20…Rear plate part 21...Terminal block 22...Support plate part 23…Receiving plate section 24…Bolt hole 25…Containment space 26...Bulkhead part 27…Opening 28...Plate (connecting member) 29…Plate-shaped power supply section 30…Plate-shaped mounting part 31...Power supply connection hole 32…Mounting hole 33…Protrusion 34…Withdrawal Control Section 40…Side wall body 41…Busbar 42…Hughes Containment Room 43... Circuit board 44…Heat sink section 45…Tab 46…Connection plate section 47...Folding section 48...Support part 49…Bent section 50...Through hole 51…Wide section 52…Fuse 53…Lead 54...Electric wire 55...Harness terminal 58…Electrical parts

Claims

1. A base member on which electrical components are mounted; a connection member connected to the electrical component, The base member is an accommodation space for accommodating the connection member; an opening portion that exposes the accommodation space to an outer surface of the base member; A holding member for holding the electrical component; a terminal block to which the connection member is fixed; A space between the holding member and the terminal block functions as the accommodation space, The base member is formed with a removal prevention portion that prevents the connection member in the accommodation space from removing from the opening.

2. The holding member is capable of holding a larger number of the electrical components than the connecting member, 2. The electrical junction box according to claim 1, wherein the removal restriction portion is formed only on the terminal block.

3. A base member to which an electrical component is attached; A connection member connected to the electrical component; a bus bar including a base portion, a quarter-circular bent portion extending from the base portion, and a connection plate portion extending from the bent portion in a direction perpendicular to the base portion, the base member has an accommodation space that accommodates the connection member and an opening that opens the accommodation space to an outer surface of the base member, a detachment prevention portion that prevents the connection member in the accommodation space from being detached from the opening portion is formed on the base member; the bus bar is disposed with the connection plate portion overlapping the connection member and the bent portion facing an outer surface of the connection member, The removal prevention portion is an electrical connection box disposed between the connection member and the bent portion.

4. A base member to which an electrical component is attached; a connection member connected to the electrical component, the base member has an accommodation space for accommodating the connection member, an opening for opening the accommodation space to an outer surface of the base member, and a component accommodation chamber for accommodating the electric component, a detachment prevention portion that prevents the connection member in the accommodation space from being detached from the opening portion is formed on the base member; The component housing chamber is open to a side of the base member, a sidewall member is attached to the base member to close a side opening of the component housing chamber; The side wall member covers the opening of the accommodation space.

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