Sealing structure

Abstract

The utility model relates to a sealing structure. A bonding portion between a resin member and a wiring terminal penetrating through the resin member is prevented from peeling off to reduce sealing performance. According to one embodiment, the sealing structure (10) is provided with a resin member (14) and a terminal (12) penetrating the resin member (14), and a penetrating portion (22) of the terminal (12) is provided with at least one locking surface (30) extending over the entire circumference of the terminal (12) and perpendicular to a side surface of the terminal (12). According to an embodiment, the at least one hooking surface (30) includes hooking surfaces respectively provided at both end portions (36, 38) in the axial direction of the through portion (22). According to the embodiment, the card hanging surface (30) is a side wall surface of a groove (32) or a flange part (34) formed on the whole periphery of the wiring terminal (12).

Description

Technical Field

[0001] The present technology relates to a sealing structure of a connection terminal penetrating a resin member. Background Art

[0002] Sometimes, a resin tank is provided with a terminal that penetrates the resin member constituting the tank so that power can be transmitted between the inside and the outside (for example, Japanese Patent Publication No. 2007-056820). In order to prevent liquid and gas from leaking to the inside and outside of the tank through the connection terminal and the resin member, it is necessary to properly seal such a connection terminal. As one of the methods, there is the following method: a primer is applied to the connection terminal, and it is integrated with the resin member by insert molding, so as to improve the adhesion between the connection terminal and the resin member by utilizing the adhesive force of the primer.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2007-056820 Utility Model Content

[0006] Problems to be solved by utility models

[0007] The resin member around the terminal may swell due to the penetration of liquid or gas inside and outside the tank. The swelling process is complicated, and the speed and direction of expansion are not necessarily the same, and there may even be temporary contraction depending on the location. Therefore, the resin member may not necessarily apply a force in the direction of pressing the terminal to the joint, and may sometimes generate a force in the direction of pulling the terminal. Even if the joint is partially peeled off, it will cause damage to the sealing performance.

[0008] Solutions for solving problems

[0009] A technical solution of the present technology is a sealing structure, which includes a resin component and a terminal penetrating the resin component, wherein the penetrating portion of the terminal has at least one hooking surface extending over the entire circumference of the terminal and perpendicular to a side surface of the terminal.

[0010] According to the technical solution, the at least one hanging surface includes hanging surfaces respectively arranged at both end portions of the penetrating portion in the axial direction.

[0011] According to the technical solution, the hook surfaces respectively arranged at the two ends of the penetration portion include a hook surface facing the central side of the penetration portion in the axial direction.

[0012] According to the technical solution, the hanging surface is a side wall surface of a groove or a flange portion formed on the entire circumference of the connecting terminal.

[0013] According to the technical solution, the side wall surface of the groove or flange portion is perpendicular to the side surface of the connecting terminal as a whole.

[0014] According to the technical solution, no primer is applied to the connecting terminal.

[0015] According to the technical solution, the evaporated fuel exists on one side of the resin member.

[0016] According to the technical solution, the resin member is a member that separates the inside and the outside of the fuel tank.

[0017] Effect of utility model

[0018] According to the above configuration, the hook surface can suppress dimensional changes of the resin member in the axial direction of the connection terminal, and as a result, the shear stress that causes peeling at the joint portion can be suppressed, thereby improving the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view showing a sealing structure of a connection terminal penetrating a resin member according to one embodiment.

[0020] Figure 2 yes Figure 1 An enlarged view of one of the terminal blocks.

[0021] Figure 3 It is a perspective view showing a penetration portion of a connection terminal having a groove as one embodiment.

[0022] Figure 4 It is a perspective view showing a penetration portion of a connection terminal having a groove as another embodiment.

[0023] Figure 5 It is a perspective view showing a penetration portion of a connection terminal having a flange portion as another embodiment.

[0024] Figure 6 It is a perspective view showing a connection terminal having a V-shaped groove as a comparative example.

[0025] Figure 7 It is a graph showing the analysis results of the shear stress generated in the joint between the resin member and the connection terminal.

[0026] Description of Reference Numerals

[0027] 10. Sealing structure; 12. Terminal block; 14. Resin member; 16, 18. End of terminal block; 20. Support portion; 22. Through portion of terminal block; 30. Hanging surface; 32. Groove; 34. Flange portion; 35. Curved surface; 36, 38. End of through portion; 40. Arrow; 112. Terminal block; 112b. Narrow surface; 112a. Wide surface; 132. V-shaped groove. DETAILED DESCRIPTION

[0028] Various embodiments will be described below with reference to the drawings.

[0029] Figure 1 A sealing structure 10 is shown as an embodiment. The sealing structure 10 includes a resin member 14 and at least one terminal 12 (only two are shown in the figure) penetrating the resin member 14. The terminal 12 is formed of a conductive metal such as copper or aluminum. The terminal 12 is configured to penetrate the resin member 14, with one end 16 exposed on one side of the resin member 14 and the other end 18 exposed on the other side of the resin member 14. Both ends of the terminal 12 are convex contacts that can be connected to the concave contacts of the connector plug (not shown).

[0030] The overall shape of the terminal block 12 is not limited to a straight line shape as shown in the figure, and can also be set to a shape having one or more bent portions or curved portions according to the purpose. The cross-sectional shape of the terminal block 12 can be set to a rectangular shape (see Figure 3 to Figure 5 ), but is not limited thereto, and can be set to any shape corresponding to the purpose, such as a circle. The connecting terminal 12 can be integrated with the resin member 14 by insert molding, for example. The primer applied to the connecting terminal in order to improve the adhesion with the resin member 14 can be omitted.

[0031] The resin member 14 may also be provided with a covering portion or a supporting portion 20 that covers a portion of the connection terminal 12 in the axial direction. Thus, the connection terminal 12 can be supported without increasing the wall thickness of the resin member 14. The resin member 14 may be provided with a recessed portion that serves as a plug seat (socket) that allows a connector plug at the end of the wiring to be inserted into each end side of the connection terminal 12.

[0032] like Figure 2 to Figure 5 As shown, the through portion 22 of the terminal 12 that penetrates the resin member 14 has at least one hanging surface 30 (at the bottom) extending over the entire circumference of the terminal 12 and perpendicular to the side of the terminal 12. Figure 1The verticality mentioned here does not only refer to strict verticality, but also includes the situation that is considered to be approximately vertical by a person skilled in the art. As a result, it is possible to suppress the dimensional change of the resin member 14, which would cause shear stress to be applied to the bonding interface between the resin member 14 and the terminal 12. Such a hanging surface 30 can be formed, for example, as a groove 32 ( Figure 3 , Figure 4 ) or flange portion 34 ( Figure 5 ) side wall. Figure 3 , Figure 5 As shown in FIG. 1 , the hanging surface 30 formed by the groove 32 and the flange portion 34 is divided into a hanging surface (A) facing the central side of the through-portion 22 in the axial direction and a hanging surface (B) facing the outer side of the through-portion 22 in the axial direction. The hanging surface 30 (A) facing the central side is useful for suppressing the axial expansion of the resin member 14 due to swelling ( Figure 2 The arrow 40) is particularly effective.

[0033] The groove 32 and the flange 34 may also be formed so that the entire side wall surface is perpendicular to the side surface of the connection terminal 12. For example, the cross-section of the groove 32 and the flange 34 may be formed in a rectangular shape. The width of the groove 32 and the protruding height of the flange 34 are not limited. Part of the outer peripheral surface of the flange 34 may be formed as a curved surface 35 without edges and corners.

[0034] The number of slots 32 is not limited, but as an example, Figure 3 A structure with four slots 32 is shown. Figure 4 The structure shown is provided with seven grooves 32. When there are multiple grooves 32, the grooves do not need to be arranged at equal intervals. For example, at least one groove 32 can be arranged at each of the two end portions 36 and 38 of the through-portion 22, avoiding the central portion in the axial direction of the through-portion 22. Figure 3 In the embodiment, groups C and D consisting of two grooves 32 are arranged at both ends 36 and 38, respectively, so that the interval between the two groups C and D is larger than the interval between the grooves 32 in each group. Conversely, a plurality of grooves 32 may be arranged in a concentrated manner in the central portion of the through-portion 22, and at least one groove 32 may be arranged at each of the two ends 36 and 38 of the through-portion 22. Figure 4 In the embodiment, a group E consisting of five grooves 32 is arranged in the center, and one groove 32 (group F, G) is arranged at each of the two end portions 36 and 38, so that the intervals between the three groups E, F, and G are larger than the intervals between the grooves 32 in the central group E. The number of flange portions 34 is also not limited. As an example, Figure 5 The structure shown is that one flange portion 34 is disposed at each of the two end portions 36, 38. In either case, the hook surface 30 is provided at least at each of the two axial end portions 36, 38 of the penetration portion 22. This can suppress dimensional changes in the portion where the dimensional changes of the resin member 14 in the axial direction are likely to be large.

[0035] Figure 7 It is shown that the computer analysis results show that Figure 3-4 The results of shear stress generated at the bonding interface due to swelling in the structures of the terminal 12 of various shapes shown (without primer). In this result, as a comparative example, Figure 6 The terminal 112 (with primer) has four V-shaped grooves 132 on the wide surface 112a as shown. The V-shaped grooves 132 are only provided in a part of the circumference (not provided on the narrow surface 112b), and the side wall surface of the V-shaped groove 132 is an inclined surface that is not perpendicular to the side surface of the terminal 112. Figure 7 As a result, it can be seen that in the case of a device having a vertical card hanging surface 30 arranged on the entire circumference of the terminal 12, Figure 3-4 In the case of the structure, the shear stress generated at the joint interface is suppressed to about half or less than that in the case of the V-groove 132. In addition, the joint strength is suppressed to be smaller than that shown by the dotted line in the figure. This is considered to be the result of suppressing the axial dimensional change of the resin component 14 by the hanging surface 30. Therefore, the peeling of the joint caused by the swelling of the resin component 14 is suppressed, and the sealing is improved. Therefore, the primer previously applied to the terminal can be omitted, and the cost can also be suppressed.

[0036] As an embodiment, the resin member 14 can be configured as a member that separates the inside and outside of a tank (not shown) that holds liquid or gas, such as a side wall, top, bottom, or lid. In this case, the terminal 12 can be used, for example, as a wiring for supplying power to an electrical device such as a pump or a liquid level sensor disposed inside the tank, or as a connection portion for wiring that transmits signals between the electrical device. The tank may also be, for example, a fuel tank that is carried on a car, ship, airplane, etc. and is used to hold fuel such as gasoline. When the fuel is liquid, part of the fuel in the fuel tank vaporizes and exists as evaporated fuel. Therefore, the inner surface of the resin member 14 constituting the fuel tank is exposed to the fuel in a liquid state or a gaseous state. The resin constituting the fuel tank can be, for example, polyacetal (POM), polyethylene (PE), ethylene-vinyl alcohol copolymer (EVOH), polyamide (PA), or a combination thereof, but is not limited thereto.

[0037] As a specific embodiment, the resin member 14 may be a cover that blocks the opening of the fuel tank. The cover may be, for example, a member (a flange-shaped mounting plate) that is integrated with a support body that holds a device such as a fuel pump disposed in the fuel tank, and a connecting portion of a fuel supply pipe that guides the fuel to a supply destination. In this case, a fuel pump assembly including a fuel pump and a mounting plate is installed in the fuel tank, and the mounting plate blocks the opening of the fuel tank. The outer end 16 of the terminal 12 is connected to an external power source or ECU via wiring. The inner end 18 of the terminal 12 is connected to the fuel pump via wiring such as a wiring harness.

[0038] Although various embodiments have been described above, the present technology is not limited to these embodiments, and a person skilled in the art can implement various additions, omissions, substitutions, and modifications.

Claims

1. A sealing structure, characterized in that: The sealing structure includes a resin member and a connection terminal penetrating the resin member. The through portion of the connection terminal has at least one hooking surface extending over the entire circumference of the connection terminal and perpendicular to the side surface of the connection terminal.

2. The sealing structure according to claim 1, characterized in that: The at least one hanging surface includes hanging surfaces respectively provided at both end portions of the penetration portion in the axial direction.

3. The sealing structure according to claim 2, characterized in that: The hook surfaces respectively provided at both ends of the penetration portion include a hook surface facing the center side in the axial direction of the penetration portion.

4. The sealing structure according to claim 1, characterized in that: The hook surface is a side wall surface of a groove or a flange portion formed on the entire circumference of the connection terminal.

5. The sealing structure according to claim 4, characterized in that: The side wall surface of the groove or the flange portion is entirely perpendicular to the side surface of the connection terminal.

6. The sealing structure according to claim 1, characterized in that: No primer is applied to the connection terminals.

7. The sealing structure according to claim 1, characterized in that: Evaporated fuel exists on one side of the resin member.

8. The sealing structure according to claim 1, characterized in that: The resin member is a member that partitions the inside and outside of the fuel tank.

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