Insert molded object, through-hole nut with cap member

Abstract

To provide an insert molded object capable of sharing a cap member even when a plurality of through-hole nuts having different diameters.SOLUTION: An insert molded object 11 of the present invention has a structure that a plurality of through-hole nuts with cap members N1, N2 are buried in a resin part 12. A plurality of through-hole nuts 21A, 21B include a cylindrical nut main body 23 provided with a screw part 22 and a cylindrical wall part 24 continuous to one end side of the nut main body 23, with the maximum diameter of the screw part 22 being different. A cap member 31 includes a lid part 32 plugging an open end 25 of the wall part 24 and a sleeve part 33 projecting from an outer peripheral edge of the lid part 32, covering the wall part 24 from the outer peripheral side and externally fitted to the wall part 24. Each of a plurality of through-hole nut 21A, 21B is equal to the external size of the wall part 24. Each of the cap member 31 is equal to the inside size of the sleeve part 33.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an insert-molded product obtained by insert molding a nut covered with a cap member, and a through nut with a cap member.

Background Art

[0002] Conventionally, an insert-molded product obtained by insert molding a through nut covered with a cap member has been known. For example, Patent Document 1 discloses an insert-molded product having a structure in which a resin cap member is attached to one end side of a through nut, and the through nut and the cap member are embedded in a resin portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above prior art has the following problems. For example, a plurality of through nuts may be inserted into one insert-molded product, and the maximum diameters (nominal diameters) of the thread portions of the through nuts may be different from each other. In such a case, it is necessary to prepare cap members according to the sizes of the through nuts, but it is costly and time-consuming to mold a plurality of types of cap members. In addition, the operation of attaching each cap according to each through nut is complicated, and the workability is poor due to mistakes in the combination of the through nut and the cap member.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide an insert-molded product and a through nut with a cap member that can share a cap member even when using a plurality of through nuts with different diameters.

Means for Solving the Problem

[0006] In order to solve the above problems, the invention described in Means 1 is an insert-molded product in which a plurality of through nuts with cap members are embedded in a resin part. The plurality of through nuts include a cylindrical nut body having a threaded portion and a cylindrical wall portion continuous with one end side of the nut body, and are composed of at least two types of through nuts having different maximum diameters of the threaded portions. The cap member has a lid portion that closes the open end of the wall portion and a sleeve portion that protrudes from the outer peripheral edge of the lid portion and covers the wall portion from the outer peripheral side, and is externally fitted to the wall portion. Each of at least two types of the through nuts has an equal outer diameter dimension of the wall portion, and each of the cap members externally fitted to the wall portions of at least two types of the through nuts has an equal inner diameter dimension in the sleeve portion. The gist of the invention is an insert-molded product characterized by this.

[0007] Therefore, according to the invention described in Means 1, even when the maximum diameters of the threaded portions are different when using at least two types of through nuts, since the outer diameter dimensions of the wall portions in each through nut are equal, a cap member having an equal inner diameter dimension in the sleeve portion can be externally fitted to those wall portions. Thus, the cap members used for at least two types of through nuts having different maximum diameters of the threaded portions can be shared. In addition, with the sharing of the cap members being possible, the cost and labor for molding the cap members are reduced, and the workability of attaching the cap members is also improved.

[0008] The gist of the invention described in Means 2 is that, in Means 1, the through nut having a relatively large maximum diameter of the threaded portion has a wall thickness formed thinner than the wall thickness of the nut body.

[0009] Therefore, according to the invention described in means 2 and the inventions described in means 8 and means 10 to be described later, by forming the wall thickness of the wall portion thinner than the wall thickness of the nut body without changing the wall thickness of the nut body, the cap member is shared, so that the rigidity of the nut body having the threaded portion can be maintained. Further, with this configuration, it becomes easier to achieve weight reduction and miniaturization of the through nut.

[0010] The invention described in means 3 is characterized in that, in means 2, the difference in the maximum diameter of the threaded portion of at least two types of the through nuts is 2 mm or less.

[0011] Therefore, according to the invention described in means 3, it is possible to prevent the wall portion of the through nut having a relatively large maximum diameter from becoming too thin.

[0012] The invention described in means 4 is characterized in that, in any one of means 1 to 3, a convex portion is formed on the inner peripheral surface of the sleeve portion of the cap member.

[0013] Therefore, according to the invention described in means 4, when the cap member is externally fitted to the wall portion, the convex portion is brought into contact with the outer peripheral surface of the wall portion of the through nut, so that the cap member can be made difficult to come off from the through nut.

[0014] The invention described in means 5 is characterized in that, in any one of means 1 to 3, an annular gap is formed between the tip of the sleeve portion and the nut body, and the resin portion enters the gap.

[0015] Therefore, according to the invention described in means 5, the resin portion enters the gap, so that the cap member is easily and firmly held by the resin portion, and the cap member can be prevented from coming off.

[0016] The invention described in means 6 is characterized in that, in any one of means 1 to 3, the outer diameter dimension of the wall portion is smaller than the outer diameter dimension of the nut body, a step is formed between the outer peripheral surface of the nut body and the outer peripheral surface of the wall portion, and the sleeve portion having a wall thickness equal to or less than the height of the step is externally fitted to the outer peripheral surface of the wall portion located on the lower stage side of the step.

[0017] Therefore, according to the invention described in means 6 and the inventions described in means 9 and 11 to be described later, when the cap member is externally fitted, the sleeve portion is in a state of being accommodated on the lower stage side of the step and does not protrude in the nut diameter direction, so that it becomes easy to achieve weight reduction and miniaturization of the through nut.

[0018] The invention described in means 7 is an insert molded product in which a plurality of through nuts with cap members are embedded in a resin portion. The plurality of through nuts include a cylindrical nut body formed with a screw portion and a cylindrical wall portion continuous with one end side of the nut body, and are composed of at least two types of through nuts having different maximum diameters of the screw portions. The cap member has a lid portion that closes the open end of the wall portion and a protrusion portion that protrudes from the central portion of the lid portion and covers the wall portion from the inner peripheral side, and is internally fitted to the wall portion. Each of at least two types of through nuts is characterized in that the inner diameter dimension of the wall portion is set to be equal, and each of the cap members internally fitted to the wall portions of at least two types of through nuts is characterized in that the outer diameter dimension of the protrusion portion is set to be equal.

[0019] Therefore, according to the invention described in means 7, even when at least two types of through nuts having different maximum diameters of the screw portions are used, since the inner diameter dimensions of the wall portions in each through nut are equal, it is possible to internally fit a cap member having an equal outer diameter dimension in the protrusion portion to these wall portions. Therefore, it is possible to share the cap members used for at least two types of through nuts having different maximum diameters of the screw portions.

[0020] The invention described in means 8 is an insert molded product in which a through nut with a cap member is embedded in a resin part. The through nut has a cylindrical nut body formed with a threaded part and a cylindrical wall part continuous with one end side of the nut body. The cap member has a lid part that closes the open end of the wall part and a sleeve part that protrudes from the outer peripheral edge of the lid part and covers the wall part from the outer peripheral side, thereby being externally fitted to the wall part. The gist of the invention is an insert molded product characterized in that the wall thickness of the wall part is formed thinner than the wall thickness of the nut body.

[0021] The invention described in means 9 is an insert molded product in which a through nut with a cap member is embedded in a resin part. The through nut has a cylindrical nut body formed with a threaded part and a cylindrical wall part continuous with one end side of the nut body. The cap member has a lid part that closes the open end of the wall part and a sleeve part that protrudes from the outer peripheral edge of the lid part and covers the wall part from the outer peripheral side, thereby being externally fitted to the wall part. The outer diameter dimension of the wall part is smaller than the outer diameter dimension of the nut body, and a step is formed between the outer peripheral surface of the nut body and the outer peripheral surface of the wall part. The gist of the invention is an insert molded product characterized in that the sleeve part having a wall thickness equal to or less than the height of the step is externally fitted to the outer peripheral surface of the wall part located on the lower stage side of the step.

[0022] The invention described in means 10 is a through nut with a cap member, which is composed of a cap member and a through nut and is embedded in a resin part during the manufacture of an insert molded product. The through nut has a cylindrical nut body formed with a threaded part and a through nut having a cylindrical wall part continuous with one end side of the nut body. The cap member has a lid part that closes the open end of the wall part and a sleeve part that protrudes from the outer peripheral edge of the lid part and covers the wall part from the outer peripheral side, thereby being externally fitted to the wall part. The gist of the invention is a through nut with a cap member characterized in that the wall thickness of the wall part is formed thinner than the wall thickness of the nut body.

[0023] The invention described in means 11 is a through nut with a cap member, which is composed of a cap member and a through nut, and is embedded in a resin part during the manufacture of an insert molded product. The through nut has a cylindrical nut body with a threaded part and a through nut having a cylindrical wall part continuous with one end side of the nut body. The cap member has a lid part that closes the open end of the wall part and a sleeve part that protrudes from the outer peripheral edge of the lid part and covers the wall part from the outer peripheral side, and is externally fitted to the wall part. The outer diameter dimension of the wall part is smaller than the outer diameter dimension of the nut body, and a step is formed between the outer peripheral surface of the nut body and the outer peripheral surface of the wall part. The sleeve part having a wall thickness equal to or less than the height of the step is externally fitted to the outer peripheral surface of the wall part located on the lower stage side of the step. The gist of the invention is a through nut with a cap member characterized by the above.

Effect of the Invention

[0024] As described in detail above, according to the inventions described in claims 1 to 11, it is possible to provide an insert molded product and a through nut with a cap member that can share a cap member even when using a plurality of through nuts with different diameters.

Brief Explanation of Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0026] (First Embodiment) Hereinafter, an insert molded product 11 according to an embodiment embodying the present invention will be described in detail with reference to FIGS. 1 to 5.

[0027] The insert molded product 11 of the present embodiment shown in FIG. 1 is a resin case of a power conversion device such as a DC-DC converter or an inverter mounted on an automobile, and includes a portion for fastening and fixing an electrode terminal connected to a battery or the like with a fastening bolt. This insert molded product 11 has a structure in which a plurality of through nuts with cap members (nut assemblies) N1 and N2 are embedded in a resin portion 12. The resin portion 12 is formed by injection molding using an insulating synthetic resin material. The synthetic resin material forming the resin portion 12 is not particularly limited and can be arbitrarily selected. In the present embodiment, for example, a PPS resin (polyphenylene sulfide resin) or a PBT resin (polybutylene terephthalate resin) having low electrical conductivity is used.

[0028] The resin portion 12 of the present embodiment has a substantially L-shaped cross section having a base portion 15 and a nut housing portion 16 rising from the base portion 15. In the present embodiment, one through nut N1 and one through nut N2 with cap members are embedded in the nut housing portion 16. For convenience, the through nut N1 with a cap member will be referred to as "the first through nut N1 with a cap member", and the through nut N2 with a cap member will be referred to as "the second through nut N2 with a cap member".

[0029] FIG. 2 is a cross-sectional view taken along line A-A of the insert molded article 11 in FIG. 1, and is a cross-sectional view of the through nut N1 with the first cap member cut along its central axis. The through nut N1 with the first cap member is composed of a through nut 21A (hereinafter referred to as "large-diameter through nut 21A") having a relatively large maximum diameter of the screw portion 22 and a cap member 31. FIG. 4(a) is a perspective view of the through nut N1 with the first cap member, showing the state after the cap member 31 is fitted onto the large-diameter through nut 21A. FIG. 4(b) is an exploded perspective view of the through nut N1 with the first cap member, showing the state before the cap member 31 is fitted onto the large-diameter through nut 21A.

[0030] The large-diameter through nut 21A is a member formed using a conductive metal and includes a cylindrical nut body 23. A screw portion 22 having a screw groove is formed on the inner peripheral side of the nut body 23. The above-mentioned tightening bolt is screwed onto the screw portion 22, whereby the electrode terminal is fastened and fixed. The maximum diameter NS1 (nominal diameter) of the screw portion 22 is not limited and is arbitrary, but in this embodiment, it is, for example, M6. At the lower end portion of the nut body 23, a cylindrical wall portion 24 continuous with the lower end portion is integrally and concentrically formed. The dimension of the outer diameter KG1 of the wall portion 24 is smaller than the dimension of the outer diameter HG1 of the nut body 23, and a relatively large step 45 is formed between the outer peripheral surface of the nut body 23 and the outer peripheral surface 24b of the wall portion 24. In the large-diameter through nut 21A, the wall thickness Knk1 of the wall portion 24 is formed to be somewhat thinner than the wall thickness Hnk1 of the nut body 23, and in this embodiment, it is formed to be less than half the thickness (see FIG. 2). Note that the entire surface of the large-diameter through nut 21A is subjected to plating treatment. The upper end surface of the nut body 23 in the large-diameter through nut 21A is exposed to the outside at the upper surface 12a of the resin portion 12.

[0031] FIG. 3 is a cross-sectional view taken along line B-B of the insert molded product 11 in FIG. 1, and is a cross-sectional view of the through nut N2 with the second cap member cut along its central axis. The through nut N2 with the second cap member is composed of a through nut 21B (hereinafter referred to as "the through nut 21B with a small diameter") having a relatively small maximum diameter of the threaded portion 22 and a cap member 31. FIG. 5(a) is a perspective view of the through nut N2 with the second cap member, showing the state after the cap member 31 is fitted onto the through nut 21B with a small diameter. FIG. 5(b) is an exploded perspective view of the through nut N2 with the second cap member, showing the state before the cap member 31 is fitted onto the through nut 21B with a small diameter.

[0032] The through nut 21B with a small diameter is a member formed using a conductive metal and includes a cylindrical nut body 23. A threaded portion 22 having a thread groove is formed on the inner peripheral side of the nut body 23. The above-mentioned tightening bolt is screwed onto the threaded portion 22, whereby the electrode terminal is fastened and fixed. The maximum diameter NS1 (nominal diameter) of the threaded portion 22 is not limited and is arbitrary, but in this embodiment, it is, for example, M5. That is, this insert molded product 11 has one through nut 21A and one through nut 21B each having a different maximum diameter NS1 of the threaded portion 22. In the insert molded product 11 of this embodiment, the difference in the maximum diameter NS1 of the threaded portion 22 between the through nut 21B with a small diameter and the through nut 21A with a large diameter is 2 mm or less. At the lower end portion of the nut body 23, a cylindrical wall portion 24 continuous with this lower end portion is integrally and concentrically formed. The dimension of the outer diameter KG1 of the wall portion 24 is smaller than the dimension of the outer diameter HG1 of the nut body 23, and a relatively small step 45 is formed between the outer peripheral surface of the nut body 23 and the outer peripheral surface 24b of the wall portion 24. In the through nut 21B with a small diameter, the wall thickness Knk1 of the wall portion 24 is formed slightly thinner than the wall thickness Hnk1 of the nut body 23 (see FIG. 3). Note that the entire surface of the through nut 21B with a small diameter is subjected to plating treatment. The upper end surface of the nut body 23 in the through nut 21B with a small diameter is exposed to the outside at the upper surface 12a of the resin portion 12. And as shown in FIGS. 2 and 3, for each of the above two types of through nuts 21A and 21B, the dimension of the outer diameter KG1 of the wall portion 24 is set to be equal.

[0033] As shown in FIGS. 2 to 5, the cap member 31 is a member attached to close one end of the through nuts 21A and 21B, and in this embodiment, it is formed using a synthetic resin material such as PPS resin or PBT resin. Of course, the cap member 31 may be formed using synthetic resin materials other than these, or may be formed using a metal material or a rubber material. When using a cap member 31 made of a synthetic resin material, it is preferable to select a material with compatibility so that it is easily welded to the resin portion 12 during the injection molding of the resin portion 12. This cap member 31 includes a lid portion 32 and a sleeve portion 33. The lid portion 32 is in the shape of a circular plate and closes the opening end 25 by contacting the end surface of the opening end 25 of the wall portion 24. The sleeve portion 33 is a portion formed in an annular shape and protrudes vertically from the outer peripheral edge 35 on the inner surface side of the lid portion 32. The sleeve portion 33 is externally fitted to the wall portion 24 so as to cover the wall portion 24 from the outer peripheral side. And in this embodiment, for each of the cap members 31 externally fitted to the wall portion 24 of the two types of through nuts (that is, the large-diameter through nut 21A and the small-diameter through nut 21B), the dimension of the inner diameter SN1 in the sleeve portion 33 is set to be equal. Further, the dimension of the inner diameter SN1 in the sleeve portion 33 is set to be substantially equal to the dimension of the outer diameter KG1 of the wall portion 24. Further, directly below each of the cap members 31, a knockout hole portion 13 generated by mold release during injection molding is formed, and the central portion of the lower surface of the lid portion 32 is exposed to the outside through the knockout hole portion 13.

[0034] As shown in FIGS. 4 and 5, convex portions 34 are formed on the inner peripheral surface 33a of the sleeve portion 33 of the cap member 31. The convex portions 34 are formed at a plurality of locations on the inner peripheral surface 33a of the sleeve portion 33, and specifically in this embodiment, they are formed at three equally spaced locations along the circumferential direction of the inner peripheral surface 33a of the sleeve portion 33. These convex portions 34 are ridges extending along the height direction of the sleeve portion 33. The ridge that is the convex portion 34 has a cross-sectional shape in which the tip (the side facing the central portion of the cap member 31) is thinner.

[0035] It is preferable that a recess surrounding the lower half of the ridge is formed at a position corresponding to the ridge which is the convex portion 34 on the outer peripheral portion of the inner surface of the lid portion 32. By doing so, when the cap member 31 is externally fitted to the through nuts 21A and 21B, even if the ridge which is the convex portion 34 hits the outer peripheral surface 24b of the wall portion 24 and shaving is generated, the shaving is received by the recess surrounding the lower half of the ridge. Therefore, scattering of the shaving to the surroundings is prevented.

[0036] In manufacturing the insert molded product 11 of the present embodiment, first, one through nut N1 and one through nut N2 with two types of cap members are prepared. Then, these through nuts N1 and N2 with cap members are set in a cavity of an injection molding die (not shown), and the die is clamped. At this time, the central portion of the lower surface of each cap member 31 is supported from below by a pin or the like (not shown). Next, after pouring a molten resin material for forming the resin portion 12 into the space in the cavity, the resin material is cooled and cured. As a result, an insert molded product 11 in which two types of through nuts N1 and N2 with cap members are embedded in the resin portion 12 can be obtained.

[0037] By the way, as shown in FIGS. 4(a) and 5(a), an annular gap 41 is formed between the tip of the sleeve portion 33 and the nut body 23. And a part of the resin portion 12 has entered the gap 41 (see FIGS. 2 and 3). Since the resin portion 12 that has entered the gap 41 serves as a so-called anchor, the cap member 31 is likely to be firmly held by the resin portion 12. Therefore, it is possible to prevent the cap member 31 from coming off from the resin portion 12.

[0038] When fastening and fixing an electrode terminal to the manufactured insert molded product 11, a fastening bolt is screwed onto the screw portions 22 of the through nuts 21A and 21B. At this time, metal powder may be generated by the rubbing between the through nuts 21A and 21B and the fastening bolt, and the metal powder may fall below the through nuts 21A and 21B and scatter to the surroundings. However, in the case of this insert molded product 11, since the cap member 31 receives the metal powder, scattering to the surroundings is prevented.

[0039] According to this embodiment, the following effects can be obtained.

[0040] (1) The insert molded article 11 of this embodiment includes two types of through nuts 21A and 21B with different maximum diameters NS1 of the screw portion 22 (similarly, the outer diameter HG1 of the nut body 23). The sleeve portion 33 of the cap member 31 is externally fitted to the wall portions 24 of the through nuts 21A and 21B. For each of the through nuts 21A and 21B, the dimension of the outer diameter KG1 of the wall portion 24 is set to be equal. For each of the cap members 31, the dimension of the inner diameter SN1 in the sleeve portion 33 is set to be equal. Therefore, the cap member 31 with the same inner diameter SN1 dimension in the sleeve portion 33 can be externally fitted to each of the wall portions 24 of the two types of through nuts 21A and 21B. Thus, the cap members 31 used for the two types of through nuts 21A and 21B with different maximum diameters NS1 of the screw portion 22 can be shared. In addition, with the sharing of the cap members 31 being possible, the cost and labor for molding the cap members 31 are reduced, and the workability of attaching the cap members 31 is also improved.

[0041] (2) The large-diameter through nut 21A that constitutes the first through nut N1 with a cap member of this embodiment has a wall thickness Knk1 of the wall portion 24 formed thinner than the wall thickness Hnk1 of the nut body 23. That is, without changing the wall thickness Hnk1 of the nut body 23, by forming the wall thickness Knk1 of the wall portion 24 thinner than the wall thickness Hnk1 of the nut body 23, the sharing of the cap member 31 is achieved. Therefore, the rigidity of the nut body 23 having the screw portion 22 can be maintained. Also, with this configuration, it becomes easier to achieve weight reduction and miniaturization of the large-diameter through nut 21A, and thus the through nut N1 with a cap member. In this embodiment, the small-diameter through nut 21B that constitutes the second through nut N2 with a cap member also has a wall thickness Knk1 of the wall portion 24 formed thinner than the wall thickness Hnk1 of the nut body 23.

[0042] (3) In the case of the insert molded product 11 of the present embodiment, since the maximum diameters (nominal diameters) of the screw portions 22 of the two types of through nuts 21A and 21B are continuous such as M5 and M6, the difference therebetween is small and is 2 mm or less. Therefore, it is possible to prevent the wall portion 24 of the large-diameter through nut 21A from becoming too thin.

[0043] (4) In the insert molded product 11 of the present embodiment, a ridge which is a convex portion 34 is formed on the inner peripheral surface 33a of the sleeve portion 33 of the cap member 31. Therefore, when the cap member 31 is externally fitted to the wall portion 24, by bringing the ridge which is the convex portion 34 into contact with the outer peripheral surface 24b of the wall portion 24 of the through nuts 21A and 21B, it is possible to make it difficult for the cap member 31 to come off from the through nuts 21A and 21B.

[0044] (5) In the insert molded product 11 of the present embodiment, an annular gap 41 is formed between the tip of the sleeve portion 33 and the nut body 23, and a part of the surrounding resin portion 12 has entered the gap 41. As a result, the cap member 31 is likely to be firmly held by the resin portion 12, and it is possible to prevent the cap member 31 from coming off.

[0045] (6) In the two types of through nuts N1 and N2 with cap members of this embodiment, the dimension of the outer diameter KG1 of the wall portion 24 is smaller than the dimension of the outer diameter HG1 of the nut body 23, and a step 45 is formed between the outer peripheral surface of the nut body 23 and the outer peripheral surface 24b of the wall portion 24. Here, for the small-diameter through nut 21B that constitutes the second through nut N2 with a cap member, a sleeve portion 33 having a wall thickness Snk1 larger than the height of the step 45 is externally fitted to the outer peripheral surface 24b of the wall portion 24 located on the lower stage side of the step 45. Therefore, when the cap member 31 is externally fitted, the sleeve portion 33 protrudes in the nut diameter direction. On the other hand, for the large-diameter through nut 21A that constitutes the first through nut N1 with a cap member, a sleeve portion 33 having a wall thickness Snk1 equal to or less than the height of the step 45 is externally fitted to the outer peripheral surface 24b of the wall portion 24 located on the lower stage side of the step 45. Therefore, when the cap member 31 is externally fitted, the sleeve portion 33 is in a state of being accommodated on the lower stage side of the step 45 and does not protrude in the nut diameter direction. Therefore, it becomes easier to achieve weight reduction and miniaturization of the large-diameter through nut 21A, and thus the first through nut N1 with a cap member.

[0046] (Second Embodiment)

[0047] Next, the insert molded product 11 of the second embodiment embodying the present invention will be described in detail with reference to FIGS. 6 to 7. Here, the description will focus on the configuration different from the first embodiment, and the same member numbers will be assigned to the common configurations and the description will be omitted.

[0048] The insert molded product 11 of this embodiment also has a structure in which one through nut N1 and N2 with a cap member are embedded in the nut housing portion 16. FIG. 6 is a cross-sectional view when the insert molded product 11 is cut along the center line of the large-diameter through nut 121A that constitutes the first through nut N1 with a cap member. FIG. 7 is a cross-sectional view when the insert molded product 11 is cut along the center line of the small-diameter through nut 121B that constitutes the second through nut N2 with a cap member.

[0049] In the present embodiment, the cap member 131 includes a lid portion 32 that closes the open end of the wall portion 24, while having a protrusion portion 39 instead of the sleeve portion 33. The protrusion portion 39 is a portion formed in a columnar shape and protrudes from the central portion on the inner surface side of the lid portion 32. The protrusion portion 39 is fitted into the wall portion 24 so as to cover the wall portion 24 from the side of the inner peripheral surface 24a. It should be noted that the protrusion portion 39 can be understood as being inserted into the opening of the wall portion 24. In the present embodiment, for each of the cap members 131 fitted into the wall portion 24 of the two types of through nuts (that is, the large-diameter through nut 121A and the small-diameter through nut 121B), the dimension of the outer diameter TG1 of the protrusion portion 39 is set to be equal. In addition, each of the large-diameter through nut 121A and the small-diameter through nut 121B is set so that the dimension of the inner diameter KN1 of the wall portion 24 is substantially equal.

[0050] Therefore, in the insert molded product 11 of the present embodiment, even when the maximum diameters NS1 of the threaded portions 22 are different when using the two types of large-diameter through nuts 121A and small-diameter through nuts 121B, the dimensions of the inner diameter KN1 of the wall portion 24 in each of the through nuts 121A and 121B are equal. For this reason, a cap member 131 having an equal outer diameter TG1 of the protrusion portion 39 can be fitted into those wall portions 24. Therefore, the cap members 131 used for the large-diameter through nut 121A and the small-diameter through nut 121B having different maximum diameters NS1 of the threaded portion 22 can be shared.

[0051] It should be noted that each embodiment of the present invention can be arbitrarily changed without departing from the gist of the invention.

[0052] · The insert molded product 11 of the above embodiment had one each of the two types of through nuts 21A and 21B with different maximum diameters NS1 of the threaded portion 22, but is not limited thereto. For example, a plurality of large-diameter through nuts 21A may be provided, or a plurality of small-diameter through nuts 21B may be provided. In addition, in the insert molded product 11 of another embodiment, for example, one or a plurality of three or more types of through nuts with different maximum diameters NS1 of the threaded portion 22 may be provided, and the cap member 31 may be shared.

[0053] · The insert molded product 11 of the above embodiment had two types of through nuts 21A and 21B with different maximum diameters NS1 of the screw part 22, but it is not limited thereto. For example, in the insert molded product 11 of another embodiment, there may be one or more large-diameter through nuts 21A only, or one or more small-diameter through nuts 21B only. In addition, when manufacturing an insert molded product 11 having one or more large-diameter through nuts 21A only, when manufacturing an insert molded product 11 having one or more small-diameter through nuts 21B only separately from this, it becomes possible to make the cap member 31 common between the two.

[0054] · In the above embodiment, both the large-diameter through nut 21A and the small-diameter through nut 21B were cylindrical, but it is not limited thereto, and for example, they may be hexagonal.

[0055] · In the above embodiment, a step was formed between the nut body 23 and the wall portion 24 on the outer peripheral side and the inner peripheral side of the large-diameter through nut 21A and the small-diameter through nut 21B, but it is not limited thereto, and a step may not be formed at those locations. For example, in the through nut N2 with a second cap member of another embodiment shown in FIG. 8, a small-diameter through nut 221B without a step on the inner peripheral side is used.

[0056] · In the above embodiment, a protrusion was formed as the convex portion 34, but it is not limited thereto, and it may be formed in a shape other than a protrusion. Further, the convex portion 34 was formed at three locations on the inner peripheral surface 33a of the sleeve portion 33, but of course, it may be formed at one location, two locations, or four or more locations. In addition, a configuration in which such a convex portion 34 is omitted may also be used.

[0057] Next, in addition to the technical idea described in the claims, the technical ideas grasped by the above-described embodiments are listed below.

[0058] (1) In claim 4 and the like, the convex portion is formed at a plurality of locations on the inner peripheral surface of the sleeve portion. (2) In claim 4 and the like, the convex portion is formed at a plurality of locations spaced apart along the circumferential direction of the inner peripheral surface of the sleeve portion. (3) In claim 4 and the like, the convex portion is a ridge extending along the height direction of the sleeve portion. (4) In the above idea (3), the ridge has a cross-sectional shape with a tapered tip. (5) In the above idea (3), a recess surrounding the ridge is formed at a position corresponding to the ridge on the outer peripheral portion of the inner surface of the lid portion.

Explanation of reference numerals

[0059] 11: Insert molded product 12: Resin portion 21A, 121A: (Relatively large-diameter) through nuts 21B, 121B, 221B: (Relatively small-diameter) through nuts 22: Threaded portion 23: Nut body 24: Wall portion 25: (Open end of the wall portion) 31, 131: Cap member 32: Lid portion 33: Sleeve portion 33a: (Inner peripheral surface of the sleeve portion) 34: Convex portion 35: (Outer peripheral edge of the lid portion) 39: Protrusion 41: Gap 45: Step TG1: Outer diameter of the protrusion KG1: Outer diameter of the wall portion KN1: Inner diameter of the wall portion NS1: Maximum diameter of the threaded portion SN1: Inner diameter of the sleeve portion HG1: Outer diameter of the nut body Hnk1: Wall thickness of the nut body Knk1: Wall thickness of the wall portion Snk1: Wall thickness of the sleeve portion N1, N2: Through nuts with cap members

Claims

1. An insert-molded product in which a plurality of through nuts with cap members are embedded in a resin part, wherein the plurality of through nuts each comprise a cylindrical nut body formed with a threaded portion and a cylindrical wall portion continuous with one end side of the nut body, and are composed of at least two types of through nuts having different maximum diameters of the threaded portion, the cap member has a lid portion that closes the open end of the wall portion and a sleeve portion that protrudes from the outer peripheral edge of the lid portion and covers the wall portion from the outer peripheral side, thereby being externally fitted to the wall portion, the outer diameter dimensions of the wall portions of at least two types of the through nuts are set to be equal, and the inner diameter dimensions of the sleeve portions of the cap members externally fitted to the wall portions of at least two types of the through nuts are set to be equal. An insert-molded product characterized by the above.

2. The insert-molded product according to claim 1, wherein the through nut having a relatively large maximum diameter of the threaded portion is formed such that the wall thickness of the wall portion is thinner than the wall thickness of the nut body.

3. The insert-molded product according to claim 2, wherein the difference in the maximum diameters of the threaded portions of at least two types of the through nuts is 2 mm or less.

4. The insert-molded product according to any one of claims 1 to 3, wherein convex portions are formed on the inner peripheral surface of the sleeve portion of the cap member.

5. The insert-molded product according to any one of claims 1 to 3, wherein an annular gap is formed between the tip of the sleeve portion and the nut body, and the resin part enters the gap.

6. The outer diameter dimension of the wall portion is smaller than the outer diameter dimension of the nut body, and a step is formed between the outer peripheral surface of the nut body and the outer peripheral surface of the wall portion. The insert-molded product according to any one of claims 1 to 3, wherein the sleeve portion having a wall thickness equal to or less than the height of the step is externally fitted to the outer peripheral surface of the wall portion located on the lower stage side of the step. An insert-molded product characterized by the above.

7. An insert-molded product in which a plurality of through nuts with cap members are embedded in a resin part, wherein the plurality of through nuts each comprise a cylindrical nut body formed with a threaded portion and a cylindrical wall portion continuous with one end side of the nut body, and are composed of at least two types of through nuts having different maximum diameters of the threaded portion, The cap member has a lid portion that closes the open end of the wall portion, and a protrusion portion that protrudes from the central portion of the lid portion and covers the wall portion from the inner peripheral side, and is fitted into the wall portion. Each of at least two types of the through nuts is set such that the inner diameter dimension of the wall portion is equal. Each of the cap members fitted into the wall portions of at least two types of the through nuts is set such that the outer diameter dimension of the protrusion portion is equal. An insert molded article characterized by the above.

8. An insert molded article in which a through nut with a cap member is embedded in a resin portion, The through nut has a cylindrical nut body formed with a threaded portion, and a cylindrical wall portion continuous with one end side of the nut body. The cap member has a lid portion that closes the open end of the wall portion, and a sleeve portion that protrudes from the outer peripheral edge of the lid portion and covers the wall portion from the outer peripheral side, and is externally fitted to the wall portion. The wall portion is formed to be thinner than the wall thickness of the nut body. An insert molded article characterized by the above.

9. An insert molded article in which a through nut with a cap member is embedded in a resin portion, The through nut has a cylindrical nut body formed with a threaded portion, and a cylindrical wall portion continuous with one end side of the nut body. The cap member has a lid portion that closes the open end of the wall portion, and a sleeve portion that protrudes from the outer peripheral edge of the lid portion and covers the wall portion from the outer peripheral side, and is externally fitted to the wall portion. The outer diameter dimension of the wall portion is smaller than the outer diameter dimension of the nut body, and a step is formed between the outer peripheral surface of the nut body and the outer peripheral surface of the wall portion. A sleeve portion having a wall thickness equal to or less than the height of the step is externally fitted to the outer peripheral surface of the wall portion located on the lower side of the step. An insert molded article characterized by the above.

10. A through nut with a cap member, which is composed of a cap member and a through nut and is embedded in a resin portion when manufacturing an insert molded article, The through nut has a through nut having a cylindrical nut body formed with a threaded portion, and a cylindrical wall portion continuous with one end side of the nut body. The cap member has a lid portion that closes the open end of the wall portion, and a sleeve portion that protrudes from the outer peripheral edge of the lid portion and covers the wall portion from the outer peripheral side, and is externally fitted to the wall portion. The wall portion is formed to be thinner than the wall thickness of the nut body. A through nut with a cap member characterized by the above.

11. A through nut with a cap member, which is composed of a cap member and a through nut and is embedded in a resin part during the manufacture of an insert molded product. The through nut has a cylindrical nut body with a threaded portion formed thereon and a through nut having a cylindrical wall portion continuous with one end side of the nut body. The cap member has a lid portion that closes the open end of the wall portion and a sleeve portion that protrudes from the outer peripheral edge of the lid portion and covers the wall portion from the outer peripheral side, thereby being externally fitted to the wall portion. The outer diameter dimension of the wall portion is smaller than the outer diameter dimension of the nut body, and a step is formed between the outer peripheral surface of the nut body and the outer peripheral surface of the wall portion. The sleeve portion having a wall thickness equal to or less than the height of the step is externally fitted to the outer peripheral surface of the wall portion located on the lower side of the step. A through nut with a cap member, characterized by the above.

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