Nut press-fit part and electric connection box

Abstract

To provide a nut press-fit part in which a nut in a threaded engagement posture can be securely pressed, and an electric connection box.SOLUTION: There is provided a nut press-fit part 50 in which a nut 40 is pressed in, and the nut press-fit part is provided with an internal space S formed of a bottom surface part 51 opposed in a downward direction Hd and an inner peripheral wall surface 52 substantially parallel to the downward direction Hd, wherein the internal space S has: an arrangement space S1 which is arranged in an upward direction Hu and in which the nut 40 in a threaded engagement posture that a bolt 30 can threadedly engage in the downward direction Hd is arranged; and a bottom surface-side space S2 which is arranged on the side of the bottom surface part 51 on a tip side in the downward direction Hd relative to the arrangement space S1. A contact part 53 which regulates intrusion of the nut 40 in the threaded engagement posture pressed in the arrangement space S1 into the bottom surface-side space S2, and an insertion regulating part 54 which regulates intrusion of a nut 40X in a non-threaded engagement posture that the bolt 30 cannot threadedly engage in the downward direction Hd into the bottom surface-side space S2 are provided with respect to the bottom surface-side space S2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to, for example, a nut press-fitting portion for press-fitting a nut, and an electrical junction box in which the nut press-fitting portion is provided on a base body. [Background technology]

[0002] A metal nut may be press-fitted and fixed into a nut press-fit portion provided on a base body or the like of a synthetic resin electrical junction box, as described in Patent Document 1, for example. Patent Document 1 discloses a configuration in which a nut press-fitting portion into which a connection nut is press-fitted is formed on a base body that constitutes a main body of an electrical connection box made of synthetic resin.

[0003] In Patent Document 1, a space is provided on the bottom side where the nut is placed, and it is configured to accommodate shavings from the press-in rib generated when the connecting nut is pressed into the nut press-in portion and to prevent interference with the tip of the bolt that screws into the nut.

[0004] However, when the nut is pressed into the nut press-in portion to be accommodated, if the nut assumes an unthreaded position in which the bolt cannot be screwed onto it, there is a risk that part of the nut will enter the space on the bottom side and become accommodated in an unthreaded position. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6407254 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a nut press-fitting portion that can reliably press-fit a nut in a screwed position, and an electrical junction box. [Means for solving the problem]

[0007] This invention is a nut press-in portion into which a nut is pressed in, the nut press-in portion having an internal space formed by a bottom surface facing the press-in direction and an inner wall surface approximately parallel to the press-in direction, the internal space being arranged on the opening side and having an arrangement space in which the nut is arranged in a screwed position where a bolt can be screwed in from the press-in direction, and a bottom side space arranged on the bottom side which is the tip side of the press-in direction with respect to the arrangement space, and characterized in that the bottom side space is provided with a first regulating portion that regulates the nut in the screwed position pressed into the arrangement space from entering the bottom side space, and a second regulating portion that regulates the nut in a non-threaded position where a bolt cannot be screwed in from the press-in direction from entering the bottom side space.

[0008] The present invention is also characterized in that the above-mentioned nut press-fitting portion is provided on a base body. The first and second restricting portions may be separate bodies, or may be integrally formed and configured to have both functions. The first and second restricting portions may be provided so as to protrude from the inner circumferential wall surface, i.e., integrally with the inner circumferential wall surface, or may be provided at a distance from the inner circumferential wall surface.

[0009] The above-mentioned screwing position is a position in which the bolt can be screwed in from the press-fitting direction, and the screwing hole of the nut passes through along the press-fitting direction. The non-threaded position is a position in which the bolt cannot be threaded from the press-fitting direction, and refers to a position in which the threaded hole of the nut penetrates along a direction intersecting, such as perpendicular to, the press-fitting direction.

[0010] According to this invention, the nut in the screwed position can be reliably press-fitted into the nut press-fitting portion. In more detail, the nut press-in portion into which the nut is press-fitted has an internal space formed by a bottom surface facing the press-fitting direction and an inner peripheral wall surface substantially parallel to the press-fitting direction, and the internal space has an arrangement space disposed on the opening side in which the nut is arranged in a screwed position so that the bolt can be screwed in from the press-fitting direction, and a bottom side space disposed on the bottom side of the arrangement space, which is the tip side in the press-fitting direction. The bottom side space is also provided with a first restricting portion that restricts the nut in the screwed position pressed into the arrangement space from entering the bottom side space. Therefore, the nut in the screwed position can be pressed into and arranged in the arrangement space in a state where it is restricted from entering the bottom side space by the first restricting portion. In addition, a second restricting portion is provided in the bottom space, which restricts the nut in the non-threaded position from entering the bottom space, thereby preventing a portion of the nut in the non-threaded position from entering the bottom space, and allowing the nut in the threaded position to be reliably press-fitted into the placement space. Furthermore, by providing the second regulating portion, even if the nut is inserted in an unthreaded position, a portion of the nut will not fit within the arrangement space, making it easy to confirm that the nut is in the unthreaded position.

[0011] As an aspect of the invention, the inner wall surface forming the internal space may be formed in a polygonal shape that follows the outer shape of the nut when viewed from the press-in direction, and at least one of the first regulating portion and the second regulating portion may be formed so as to protrude from the inner wall surface toward the internal space.

[0012] According to the present invention, the nut in the screwed position can be easily and more reliably press-fitted into the arrangement space. In detail, the nut in a screwed position can be easily pressed into the arrangement space by pressing the nut in a screwed position along the inner wall surface which is formed in a polygonal shape that follows the outer shape of the nut when viewed from the pressing-in direction.

[0013] Furthermore, since the first and second regulating portions are formed so as to protrude toward the internal space from the inner wall surface formed in a polygonal shape, it is possible to construct a first regulating portion and a second regulating portion with higher rigidity than a first regulating portion and a second regulating portion formed at a distance from the inner wall surface. In addition, both the first regulating portion and the second regulating portion may be configured to protrude from the inner wall surface, or only one of the first regulating portion and the second regulating portion may be configured to protrude from the inner wall surface.

[0014] As another aspect of the present invention, the multiple first regulating portions may be provided at or near at least one of multiple corners of the inner wall surface which is formed in a polygonal shape when viewed from the press-fit direction. According to this invention, a highly rigid first regulating portion can be configured, and interference between the tip of the bolt and the first regulating portion can be prevented when the bolt is screwed into the nut.

[0015] As a further aspect of the present invention, the second restricting portion may protrude from at least one of opposing wall surfaces of the inner circumferential wall surface formed in a polygonal shape when viewed from the press-fitting direction toward the other. As described above, the second regulating portion protruding from at least one of the opposing wall surfaces of the inner wall surface toward the other may be in a form protruding from one of the opposing wall surfaces of the inner wall surface toward the other, or may be in a form protruding in opposing directions from both of the opposing wall surfaces of the inner wall surface. According to this invention, it is possible to more reliably prevent the nut in an unthreaded position oriented perpendicular to the opposing wall surfaces of the inner circumferential wall surface from entering the bottom side space.

[0016] As another aspect of the invention, a press-in rib protruding from the inner wall surface and formed elongated along the press-in direction in a portion of the arrangement space on the inner wall surface is provided, the press-in rib contacting the peripheral surface of the pressed-in nut, the press-in rib being arranged at a predetermined interval in a transverse direction intersecting the press-in direction on each wall surface of the inner wall surface formed into a polygonal shape, and the second regulating portion may be arranged between the press-in ribs arranged at a predetermined interval in the transverse direction.

[0017] According to this invention, the nut is press-fitted into the arrangement space while being in contact with the press-fit rib and being deformed, so that the nut can be press-fitted in a state in which it is reliably in contact with the press-fit rib. In addition, the second restricting portions are disposed between the press-fit ribs disposed at predetermined intervals in a direction intersecting the press-fit direction on each wall surface of the polygonal inner peripheral wall surface. Therefore, the press-fit ribs can be deformed without interference from the second restricting portions. Therefore, the press-fit ribs are deformed and come into contact with each other when the nut is pressed in, and the press-fit state can be stabilized.

[0018] As a further aspect of the present invention, the first restricting portion may function as the second restricting portion, and only the first restricting portion may be provided. According to this invention, compared to the case where the first regulating portion and the second regulating portion are provided separately, only the first regulating portion, which also functions as the second regulating portion, is arranged in the bottom side space, thereby simplifying the structure of the nut press-in portion. Effect of the Invention

[0019] According to the present invention, it is possible to provide a nut press-fitting portion and an electrical junction box that can reliably press-fit a nut in a screwed position. [Brief description of the drawings]

[0020] [Figure 1] FIG. 4 is a schematic perspective view showing a nut press-fitting portion and its surroundings. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. 11 is an explanatory diagram of a nut press-fitting portion in another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a schematic perspective view showing a nut press-fitting portion 50 and its surroundings, FIGS. 2 to 4 are explanatory views of the nut press-fitting portion 50, and FIG.

[0022] 2 to 4 will be described in detail. Fig. 2(a) shows a schematic enlarged perspective view of the nut press-fitting portion 50, Fig. 2(b) shows a schematic plan view of the nut press-fitting portion 50, Fig. 3(a) shows a cross section taken along line AA in Fig. 2(b), Fig. 3(b) shows a cross section taken along line AA in Fig. 2(b) with the nut 40 partially press-fitted into the nut press-fitting portion 50, Fig. 4(a) shows a cross section taken along line BB in Fig. 3(a), and Fig. 4(b) shows a cross section taken along line CC in Fig. 4(a) with the plate 10 attached to the base body 20.

[0023] For convenience of explanation, the up-down direction in FIG. 1 is the height direction H, the upper side along the height direction H is the upper direction Hu, and the lower side is the downward direction Hd. In the following explanation, the direction in which the nut 40 is pressed into the nut press-fitting portion 50 (press-fitting direction) is the downward direction Hd, but the press-fitting direction is not limited to the downward direction Hd. Among the directions perpendicular to the height direction H, one direction of the nut press-fitting portion 50 formed in a square shape in a plan view is the width direction W, and the other direction is the depth direction D. Note that the width direction W and the depth direction D are directions determined for convenience, and either one may be the width direction W and the depth direction D. The directions defined in FIG. 1 are the same in FIG. 2 to FIG. 5.

[0024] As shown in Fig. 1, the electrical junction box 1 includes a plate 10 and a base body 20 to which the plate 10 is attached. The plate 10 is fixed to the base body 20 using metal bolts 30 and nuts 40 that are square in plan view. The electrical junction box 1 may include an upper case that covers the upper side of the base body 20 and a lower case that covers the lower side of the base body 20, but a description of these will be omitted here. Note that only a portion of the electrical junction box 1 is shown in Fig. 1 and other figures.

[0025] First, the bolt 30 and the nut 40 will be described. The bolt 30 is a hexagonal bolt having a bolt head 31 that is hexagonal in plan view and a bolt shank 32 that extends a predetermined length downward Hd from the bolt head 31 and has a predetermined neck length. A thread is formed on the outer periphery of the bolt shank 32.

[0026] The nut 40 is a metal plate nut having a predetermined thickness and formed in a square shape when viewed from above, that is, when viewed from the height direction H. The nut 40 also has a screw hole 41 penetrating in the height direction H at the center when viewed from above, which allows the bolt shank 32 of the bolt 30 to be screwed in. The nut 40 formed in a square shape when viewed from above is formed with a thickness that is about 1 / 3 of the side length of the square.

[0027] Next, the plate 10 and the base body 20 will be described. The plate 10 is a metal connection plate. However, the material and function of the plate 10 are not limited as long as the plate 10 is a plate-like object that can be attached to the base body 20. For example, the plate 10 may be a terminal, a circuit board, a bus bar, etc. The plate 10 is formed with an insertion hole 11 that is generally circular in plan view and allows the bolt shank 32 of the bolt 30 to pass therethrough.

[0028] The base body 20 is a block made of resin. The base body 20 has an attachment surface 21 on the upper side Hu to which the plate 10 is attached. The attachment surface 21 is also provided with a nut press-fitting portion 50 for attaching the nut 40. The nut press-fit portion 50 is a recess formed on the mounting surface 21 in a square shape in plan view, which is substantially the same as the planar shape of the nut 40, and is recessed in the downward direction Hd.

[0029] In detail, as shown in Figures 2(b) and 3(a), the nut press-fitting portion 50 is composed of a bottom surface portion 51 facing the opening A and an inner wall surface 52 connecting the outer edge of the bottom surface portion 51 and the mounting surface 21 in the height direction H, forming an internal space S therein and an opening A at the end in the upward direction Hu.

[0030] As shown in FIG. 3(a), in the internal space S, a portion on the upper Hu side is defined as an arrangement space S1, and a portion on the lower Hd side of the arrangement space S1 is defined as a bottom side space S2. Specifically, a space from the opening A to a depth approximately equal to the thickness of the nut 40 is defined as an arrangement space S1 for accommodating the nut 40, and a space Hd below this is defined as a bottom space S2.

[0031] The bottom surface portion 51 facing the opening portion A in the height direction H is formed in a square shape in a plan view that is slightly larger than the planar shape of the nut 40. The bottom surface portion 51 is formed parallel to the mounting surface 21 and constitutes the bottom of the nut press-fitting portion 50.

[0032] The inner peripheral wall surface 52 extends from the outer edge of the bottom surface portion 51 in the upward direction Hu, and constitutes the inner wall surface of the nut press-fitting portion 50. Therefore, the inner peripheral wall surface 52 is provided on four sides so as to face each other in both the width direction W and the depth direction D. Also, the length in the height direction H of the inner peripheral wall surface 52, i.e., the depth of the nut press-fitting portion 50, is formed to be about 2.5 times the thickness of the nut 40 in this embodiment, but is appropriately adjusted depending on the neck length of the bolt 30 and the thickness of the nut 40.

[0033] As described above, the nut press-in portion 50, which forms an internal space S that is concave in the downward direction Hd between the bottom surface portion 51 and the inner wall surface 52, is provided with a contact portion 53, an insertion restriction portion 54, and a press-in rib 55, as shown in Figures 2(a) and 2(b). Specifically, a contact portion 53 that restricts the nut 40 arranged in the arrangement space S1 from entering the bottom side space S2 and an insertion restriction portion 54 that prevents the nut 40X in a non-threaded position from entering the bottom side space S2 are provided in the bottom side space S2. Also, a press-fit rib 55 is provided from the arrangement space S1 to the bottom side space S2 to position the nut 40 to be press-fitted into the nut press-fit portion 50 in the arrangement space S1 without play.

[0034] 1, the screwed position of the nut 40 is an orientation in which the screw hole 41 faces the height direction H and the bolt head 31 of the bolt 30 can be screwed from the height direction H. In addition, as shown in nut 40X shown by dashed lines in Fig. 2(b) and Fig. 3(a), the non-threaded position is an orientation in which the screw hole 41 faces a direction intersecting the height direction H, such as the width direction W or the depth direction D, and the bolt head 31 of the bolt 30 cannot be screwed into the screw hole 41 from the height direction H.

[0035] The contact portion 53, which regulates the intrusion of the nut 40 placed in the arrangement space S1 into the bottom side space S2, is a regular square prism having an upper surface 531 that abuts against the lower surface of the nut 40 placed in the arrangement space S1, and is formed at the height of the bottom side space S2.

[0036] The contact portions 53 are formed so that their lengths in the width direction W and height direction H are about 1 / 5 of the lengths in the width direction W and height direction H of the inner circumferential wall surface 52. The contact portions 53 thus formed are disposed at the corners of a square in plan view so as to protrude inward in the width direction W and depth direction D and in the upward direction Hu from the two inner circumferential wall surfaces 52 and the bottom surface portion 51 that are perpendicular to each other in plan view, and a total of four contact portions 53 are provided.

[0037] The insertion control portion 54, which controls the nut 40X in an unthreaded position from entering the bottom side space S2, is a rectangular prism that is rectangular in a plan view and whose length along the inner wall surface 52 is shorter than the length that protrudes from the inner wall surface 52, and is formed slightly lower than the height of the contact portion 53.

[0038] Further, the length of the insertion restricting portions 54 protruding from the inner peripheral wall surface 52 is approximately the same as that of the contact portions 53, and the length along the inner peripheral wall surface 52 is approximately half that of the contact portions 53. The insertion restricting portions 54 thus formed are disposed inward in plan view at the center of each inner peripheral wall surface 52, and four in total are provided.

[0039] More specifically, the insertion restricting portion 54 provided on the inner peripheral wall surface 52 along the width direction W is disposed at the center of the inner peripheral wall surface 52 along the width direction W so as to protrude in the depth direction D toward the other inner peripheral wall surface 52 opposing in the depth direction D. Moreover, the insertion restricting portion 54 provided on the inner peripheral wall surface 52 along the depth direction D is disposed at the center of the inner peripheral wall surface 52 along the depth direction D so as to protrude in the width direction W toward the other inner peripheral wall surface 52 opposing in the width direction W.

[0040] In this manner, the contact portion 53 and the insertion restricting portion 54 arranged in the internal space S are arranged at a distance X that is approximately 1 / 4 of the length of the inner wall surface 52 in the width direction W or depth direction D, as shown in FIG. 4(a). The distance between opposing contact portions 53 and insertion restricting portions 54 in the width direction W and depth direction D, i.e., the imaginary square V (shown by a dotted line in Figure 5) connecting the vertices of the contact portions 53 provided at the corners of the inner wall surface 52 and the insertion restricting portions 54 provided at the center of the inner wall surface 52, is formed wider than the diameter of the bolt shaft portion 32 of the bolt 30.

[0041] The press-in rib 55, which is arranged from the arrangement space S1 to the bottom side space S2 and is used to arrange the nut 40 to be pressed into the nut press-in portion 50 in the arrangement space S1 without any play, is an elongated crush rib and is formed in a semi-cylindrical shape that is approximately semicircular when viewed from above.

[0042] The press-in rib 55, which is formed in a semi-cylindrical shape, is formed from the arrangement space S1 to the bottom side space S2, that is, at approximately the same height as the inner wall surface 52, and its upper surface, which is an inclined surface 551, is inclined downward Hd as it approaches the internal space S, as shown in Figure 3(a).

[0043] Furthermore, eight press-fit ribs 55 are provided in total, two of which are disposed at a predetermined interval from the center of each inner peripheral wall surface 52. Specifically, the two press-fit ribs 55 are disposed at an interval of approximately 1 / 5 of the side length of the inner peripheral wall surface 52.

[0044] The above-mentioned insertion restricting portion 54 disposed at the center of the inner wall surface 52 is disposed between two press-fit ribs 55 disposed at a distance of approximately 1 / 5 of the side length of the inner wall surface 52. Further, the interval between the press-fit ribs 55 facing each other in the width direction W or the depth direction D is slightly shorter than the side length of the nut 40 formed into a square shape in a plan view.

[0045] Next, a method for assembling the electrical junction box 1 having the above-mentioned components will be briefly described. First, the nut 40 is inserted in the press-fitting direction from the upward direction Hu into the nut press-fitting portion 50. Specifically, the nut 40 in a screwed position is press-fitted into the arrangement space S1 from the upward direction Hu of the opening A.

[0046] In plan view, the inner peripheral wall surface 52 is formed in a shape that follows the outer shape of the nut 40, i.e., in a substantially square shape, so that the nut 40 in the screwed position can be easily press-fitted into the arrangement space S1. In addition, the outer edge of the lower surface of the nut 40 abuts against the inclined surface 551 at the upper end of the press-fit rib 55, so that the nut 40 is centered with respect to the nut press-fit portion 50.

[0047] By press-fitting the nut 40 in a screwed and centered state into the nut press-fit portion 50 , the peripheral surface of the nut 40 can be brought into uniform contact with the press-fit rib 55 . At this time, as shown in Fig. 4(b), by pressing the nut 40 into the press-fit rib 55 while contacting it, the press-fit rib 55 is scraped off, generating shavings 552. The shavings 552 are formed so as to protrude in the protruding direction of the press-fit rib 55, but are generated by scraping off the elongated press-fit rib 55, and are formed in an elongated band shape.

[0048] Subsequently, when the nut 40 in the screwed posture is further press-fitted into the arrangement space S1, the lower surface of the nut 40 comes into contact with the upper surface 531 of the contact portion 53, and is restricted from entering the bottom side space S2. Therefore, the nut 40 in the screwed posture can be press-fitted and arranged in the arrangement space S1 in a state where the nut 40 is restricted by the contact portion 53 from entering the bottom side space S2. In addition, since the contact portion 53 is formed slightly higher than the insertion restriction portion 54, the nut 40 in the screwed position is reliably supported only by the contact portion 53 without coming into contact with the insertion restriction portion 54.

[0049] As shown in Fig. 4(a) in a plan view, the contact portion 53 and the insertion restricting portion 54 are arranged offset in the width direction W or the depth direction D with respect to the press-fit rib 55, so that the possibility of the shavings 552 falling onto the contact portion 53 and the insertion restricting portion 54 is low. In other words, as shown in Fig. 4(b), the shavings 552 do not restrict the deformation of the press-fit rib 55 by contacting the contact portion 53 or the insertion restricting portion 54, and the shavings 552 are accommodated in the bottom side space S2 without being sandwiched between the nut 40 and the contact portion 53 or the insertion restricting portion 54. Therefore, the nut 40 can be maintained in the screwed position.

[0050] Furthermore, since the insertion restriction portion 54 is provided in the bottom surface side space S2, it is possible to restrict the nut 40X in the non-threaded position from entering the bottom surface side space S2. Specifically, as described above, the contact portion 53 and the insertion restricting portion 54 arranged in the internal space S are arranged at a distance X (see FIG. 4(a)) that is about 1 / 4 of the length of the width direction W or depth direction D of the inner circumferential wall surface 52, and the nut 40 is formed with a thickness that is about 1 / 3 of the side length of the square, that is, the length of the width direction W or depth direction D of the inner circumferential wall surface 52. In other words, since the thickness of the nut 40X in the non-threaded position is wider (longer) than the distance between the contact portion 53 and the insertion restricting portion 54, it is possible to prevent the screw hole 41 from erroneously being oriented along the opposing direction of the inner circumferential wall surface 52, that is, the nut 40X in the non-threaded position from entering the bottom side space S2.

[0051] After the nut 40 in the screwed position has been pressed into the nut press-fit portion 50, the plate 10 is placed on the mounting surface 21 so that the screw hole 41 of the nut 40 and the insertion hole 11 of the plate 10 are in communication with each other. This makes it possible to mount the plate 10 to the base body 20 with the bolts 30.

[0052] Then, the bolt shank 32 of the bolt 30 is screwed into the screw hole 41 of the nut 40 through the communicating insertion port 11. At this time, since an imaginary square V (see FIG. 5 ) connecting the vertices of the contact portions 53 provided at the corners of the inner circumferential wall surface 52 and the insertion restricting portion 54 provided at the center of the inner circumferential wall surface 52 is larger than the bolt shank 32, the nut press-in portion 50 can be screwed in without interfering with the bolt shank 32 into which the contact portions 53 and the insertion restricting portion 54 are screwed.

[0053] Finally, the bolts 30 are screwed in to complete the attachment of the plate 10 to the base body 20. By assembling in the above manner, the nut 40 in a screwed position is reliably press-fitted into the nut press-fit portion 50, and the plate 10 is attached to the base body 20, thereby enabling the electrical junction box 1 to be assembled.

[0054] The nut press-in portion 50 configured in this manner has an internal space S formed by a bottom surface portion 51 facing the downward direction Hd and an inner circumferential wall surface 52 that is approximately parallel to the downward direction Hd. The internal space S is arranged in an upward direction Hu and has an arrangement space S1 in which the nut 40 is arranged in a screwed position so that the bolt 30 can be screwed into it in the downward direction Hd, and a bottom side space S2 arranged on the side of the bottom surface portion 51 that is the tip side in the downward direction Hd with respect to the arrangement space S1. The bottom side space S2 is provided with a contact portion 53 that prevents the nut 40 in a screwed position pressed into the arrangement space S1 from entering the bottom side space S2, and an insertion prevention portion 54 that prevents the nut 40X in a non-threaded position so that the bolt 30 cannot be screwed into it in the downward direction Hd from entering the bottom side space S2. Moreover, in the electrical junction box 1, the above-mentioned nut press-fitting portion 50 is provided on the base body 20.

[0055] This allows the nut 40 in the screwed position to be reliably press-fitted into the nut press-fit portion 50 . In detail, the nut press-in part 50 into which the nut 40 is press-fitted has an internal space S formed by a bottom surface part 51 facing the downward direction Hd and an inner peripheral wall surface 52 substantially parallel to the downward direction Hd, and the internal space S is arranged in the upward direction Hu, and has an arrangement space S1 in which the nut 40 in a screwed position in which the bolt 30 can be screwed from the downward direction Hd is arranged, and a bottom side space S2 arranged on the side of the bottom surface part 51 which is the tip side in the downward direction Hd with respect to the arrangement space S1. The bottom side space S2 is also provided with a contact part 53 that restricts the nut 40 in a screwed position pressed into the arrangement space S1 from entering the bottom side space S2. Therefore, the nut 40 in a screwed position can be press-fitted and arranged in the arrangement space S1 in a state in which the contact part 53 restricts the nut 40 from entering the bottom side space S2.

[0056] Further, an insertion restriction portion 54 is provided in the bottom side space S2. This restricts the nut 40X in the non-threaded position from entering the bottom side space S2, so that the nut 40 in the threaded position can be reliably press-fitted into the arrangement space S1 without a part of the nut 40X in the non-threaded position entering the bottom side space S2.

[0057] Furthermore, by providing the insertion control portion 54, even if the nut 40X in the non-threaded position is inserted into the nut press-fitting portion 50, a portion of the nut 40X in the non-threaded position does not fit into the bottom side space S2, so that it is easy to visually confirm from the outside that the nut 40 is in the non-threaded position.

[0058] In addition, the inner wall surface 52 that forms the internal space S is formed in a square shape that follows the outer shape of the nut 40 when viewed from the press-in direction, and the contact portion 53 and the insertion regulating portion 54 are formed so as to protrude from the inner wall surface 52 toward the internal space S.

[0059] This allows the nut 40 in the screwed position to be easily and more reliably press-fitted into the arrangement space S1. In detail, the nut 40 in the screwed position can be easily pressed into the arrangement space S1 by pressing the nut 40 in the screwed position along the inner wall surface 52 which is formed in a square shape that follows the outer shape of the nut 40 when viewed from the downward direction Hd.

[0060] In addition, since the contact portion 53 and the insertion regulating portion 54 are formed so as to protrude toward the internal space S from the inner wall surface 52 which is formed in a square shape, it is possible to construct a contact portion 53 and an insertion regulating portion 54 with higher rigidity than the contact portion 53 and the insertion regulating portion 54 which are formed at a distance from the inner wall surface 52.

[0061] The contact portions 53 are provided at the four corners of the inner circumferential wall surface 52 that is formed in a square shape when viewed from the downward direction Hd. This makes it possible to configure the contact portion 53 with high rigidity, and also to prevent interference between the tip of the bolt 30 and the contact portion 53 when the bolt 30 is screwed into the nut 40.

[0062] The insertion restricting portion 54 protrudes in the opposing directions from both of the opposing wall surfaces of the inner circumferential wall surface 52 that is formed in a square shape when viewed from the downward direction Hd. This makes it possible to more reliably prevent the nut 40X in a non-threaded position perpendicular to the opposing wall surfaces of the inner circumferential wall surface 52 from entering the bottom side space S2.

[0063] Further, in the portion of the arrangement space S1 on the inner circumferential wall surface 52, press-in ribs 55 are provided which protrude from the inner circumferential wall surface 52, are formed elongated along the downward direction Hd, and come into contact with the peripheral surface of the press-fit nut 40. The press-in ribs 55 are arranged at predetermined intervals in an intersecting direction intersecting with the downward direction Hd on each wall surface of the inner circumferential wall surface 52 which is formed in a square shape, and the insertion restriction portion 54 is arranged between the press-in ribs 55 which are arranged at predetermined intervals in the intersecting direction. As a result, the nut 40 is press-fitted into the arrangement space S1 while being deformed by contact with the press-fit rib 55. Therefore, the nut 40 can be press-fitted in a state in which it is in reliable contact with the press-fit rib 55.

[0064] Furthermore, on each wall surface of the square-shaped inner peripheral wall surface 52, the insertion restricting portions 54 are disposed between the press-in ribs 55 disposed at predetermined intervals in the width direction W or depth direction D intersecting the downward direction Hd, so that the shavings 552 generated by the press-fitting of the nut 40 into the arrangement space S1 do not come into contact with the insertion restricting portions 54 and interfere with the deformation of the press-in ribs 55, that is, the press-in ribs 55 can be deformed without interference from the insertion restricting portions 54. Therefore, the press-fitting of the nut 40 causes the press-in ribs 55 to deform and come into close contact with the nut 40, and the press-fitted state in the arrangement space S1 can be stabilized.

[0065] In the configuration of the present invention and the correspondence with the above-mentioned embodiment, The nut of the present invention corresponds to the nut 40 of the embodiment. Similarly, The nut press-fitting portion corresponds to the nut press-fitting portion 50, The press-fit direction corresponds to the downward direction Hd. The bottom surface corresponds to the bottom surface portion 51, The inner peripheral wall surface corresponds to the inner peripheral wall surface 52, The internal space corresponds to the internal space S, The opening side corresponds to the upward direction Hu, The bolts correspond to bolt 30. The configuration space corresponds to the configuration space S1, The bottom side space corresponds to the bottom side space S2, The first restricting portion corresponds to the contact portion 53, The second restriction portion corresponds to the insertion restriction portion 54, The press-fit rib corresponds to the press-fit rib 55, The base body corresponds to the base body 20, The electrical junction box corresponds to the electrical junction box 1, The present invention is not limited to the configurations of the above-described embodiments, and many other embodiments can be obtained.

[0066] For example, the contact portion 53 and the insertion restricting portion 54 are configured to protrude from the inner circumferential wall surface 52 , that is, to be integral with the inner circumferential wall surface 52 , but may be provided at a distance from the inner circumferential wall surface 52 . In addition, the outer shape of the nut 40 is a square, but is not limited to this. For example, the nut 40 may be a hexagonal nut, and in this case, the shape of the nut press-fitting portion 50 is a hexagon that follows the outer shape of the nut 40.

[0067] In the above description, the direction in which the nut 40 is pressed into the nut press-fitting portion 50 is the downward direction Hd, but this is not limited to this direction. For example, when the nut 40 is pressed into the base body 20 arranged in the upward direction Hu from the downward direction Hd, the press-fitting direction is the upward direction Hu. Furthermore, when the nut 40 is pressed into the base body 20 having the mounting surface 21 arranged parallel to the height direction H, the press-fitting direction is a direction perpendicular to the height direction H, and the screwing posture at this time is a posture in which the screwing hole of the nut 40 penetrates along the width direction W or depth direction D perpendicular to the height direction H.

[0068] In addition, the non-threaded position is a position in which the bolt 30 cannot be screwed in from the upward direction Hu, and the screw hole 41 of the nut 40 penetrates along the width direction W and depth direction D perpendicular to the downward direction Hd, but it is sufficient that the direction intersects with the press-in direction.

[0069] In addition, although both the contact portion 53 and the insertion restricting portion 54 are configured to protrude from the inner wall surface 52, it may be configured so that only one of the contact portion 53 and the insertion restricting portion 54 protrudes from the inner wall surface 52. Although the contact portions 53 are provided at all corners of the inner peripheral wall surface 52 which is formed in a square shape in plan view, they may be provided at at least one corner or in the vicinity of a corner.

[0070] In addition, the insertion restricting portion 54 is configured to protrude in the opposing directions from both the width direction W and the depth direction D of the inner wall surface 52, which is formed into a square shape when viewed in a plan view, but it may also be configured to protrude from only one of the opposing inner wall surfaces 52 toward the other.

[0071] In addition, the nut 40 is pressed into the nut press-in portion 50 by contacting the press-in rib 55, but it is also possible to form the inner wall surface 52 one size smaller without providing the press-in rib 55 and press-in the nut 40 by contacting it with the nut 40.

[0072] In addition, in the above description, the contact portion 53 serving as a first regulating portion that regulates the nut 40 in a screwed position pressed into the arrangement space S1 from entering the bottom side space S2, and the insertion regulating portion 54 serving as a second regulating portion that regulates the nut 40X in a non-threaded position from entering the bottom side space S2 are separately provided, but as shown in Figure 6, only the first regulating portion that also functions as the second regulating portion may be provided.

[0073] FIG. 6(a) shows a schematic enlarged perspective view of a nut press-fitting portion 50 of another embodiment, and FIG. 6(b) shows a side cross-sectional view of the aforementioned another embodiment. For example, as shown in Figures 6(a) and 6(b), a restricting tube portion 56 having a generally rectangular shape in plan view may be provided in the center of the bottom surface portion 51 in plan view as a first restricting portion that also functions as a second restricting portion. Note that the restricting tube portion 56 is formed to have a size in plan view that is generally the same as the virtual square V (see Figure 5) in the nut press-fitting portion 50 described above, and to have the same height as the bottom surface side space S2.

[0074] As a result, compared to a case where the contact portion 53 and the insertion restricting portion 54 are provided separately, only the restricting tube portion 56, which is the first restricting portion that also functions as the second restricting portion, is disposed in the bottom side space S2, and the structure of the nut press-fitting portion 50 can be simplified. Also, as shown in FIG. 6(b), the bolt shank 32 of the bolt 30 can be screwed into the nut 40 pressed into the arrangement space S1 without interfering with the restricting tube portion 56. In addition, it is possible to reliably restrict the nut 40 in the screwed position from entering the arrangement space S1, and to prevent the nut 40X in the non-threaded position from entering the bottom side space S2. [Explanation of symbols]

[0075] 1...Electrical junction box 20...Base body 30…Volts 40…Nut 50...Nut press-fit part 51…Bottom part 52…Inner wall surface 53…Contact part 54...Insertion restriction part 55…Press-fit rib Hu...Upward Hd…Downward S…interior space S1…Placement space S2...bottom side space

Claims

1. A nut press-fitting portion into which a nut is press-fitted, The direction in which the nut is pressed into the nut press-fitting portion is defined as a press-fitting direction. The nut press-fitting portion is an internal space is provided, the internal space being defined by a bottom surface facing the press-fitting direction and an inner peripheral wall surface substantially parallel to the press-fitting direction; The internal space is an arrangement space in which the nut is arranged on an opening side and in which the nut is arranged in a screwing position in which the bolt can be screwed into the nut from the press-fitting direction; a bottom surface side space that is disposed on the bottom surface side that is the tip side in the press-fitting direction with respect to the arrangement space, The bottom surface side space, a first restriction portion that restricts the nut in the screwed position press-fitted into the arrangement space from entering the bottom side space; a second regulating portion that regulates the nut in a non-threaded position in which the bolt cannot be threaded from the press-fitting direction from entering the bottom side space. Nut press-fitting part.

2. The inner peripheral wall surface forming the internal space is formed into a polygonal shape that follows the outer shape of the nut when viewed from the press-fitting direction, At least one of the first and second restricting portions is formed so as to protrude from the inner circumferential wall surface toward the internal space. The nut press-fitting portion according to claim 1 .

3. The first restricting portions are provided at least at one of a plurality of corners of the inner circumferential wall surface formed in a polygonal shape as viewed from the press-fitting direction or in the vicinity of the corner. The nut press-fitting portion according to claim 2 .

4. The second restriction portion is The inner peripheral wall surface is formed in a polygonal shape when viewed from the press-fitting direction, and at least one of the opposing wall surfaces of the inner peripheral wall surface protrudes toward the other wall surface. The nut press-fitting portion according to claim 2 .

5. The inner circumferential wall surface is provided in the arrangement space. A press-fit rib is provided which protrudes from the inner peripheral wall surface, is elongated along the press-fit direction, and comes into contact with the peripheral surface of the press-fit nut, The press-fit ribs are disposed at predetermined intervals on each wall surface of the inner peripheral wall surface formed in a polygonal shape in a direction intersecting the press-fit direction, The second restricting portion is disposed between the press-fit ribs disposed at a predetermined interval in the intersecting direction. The nut press-fitting portion according to claim 2 .

6. The first restricting portion also functions as the second restricting portion, and only the first restricting portion is provided. The nut press-fitting portion according to claim 1 .

7. The nut press-fitting portion according to any one of claims 1 to 6 is provided on a base body. Electrical junction box.

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