Braided body fixing structure and shield connector

Abstract

The present invention provides a braided structure and a shield connector that can improve the fixing strength of the braided structure to the shield shell. [Solution] The fixing structure 10 for the braided body 20 is a structure in which the end portion 21a of the braided body 20 in the shielded wire SW is sandwiched and fixed between the shield ring 4 and the shield shell 3, wherein the shield shell 3 has a crimping portion 33 on its outer peripheral surface 32 that faces the shield ring 4 with the end portion 21a of the braided body 20 in between, and a concave serration 34 is formed thereon.

Description

Technical Field

[0001] The present invention relates to a fixing structure of an assembly and a shield connector.

Background Art

[0002] Some shield connectors include a housing that houses terminals provided at the ends of shielded wires, a shield shell assembled to the housing, and a shield ring that fixes the end of the braided body in the shielded wire to the shield shell. As a fixing structure of the braided body to the shield shell, there is known a structure in which the end of the braided body is covered with a cylindrical fixing portion formed in the shield shell and through which the wire is inserted inward, and the shield ring is crimped to the outer peripheral surface of the braided body, or a structure in which a crimping piece formed in the shield shell is crimped from the outside of the braided body (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the conventional fixing structure of the braided body and the conventional shield connector, when the shield ring is crimped to the outer peripheral surface of the braided body, there is a demand to improve the fixing strength of the braided body to the shield shell.

[0005] An object of the present invention is to provide a fixing structure of a braided body and a shield connector that can improve the fixing strength of the braided body to the shield shell.

Means for Solving the Problems

[0006] To achieve the above objective, the braided body fixing structure according to the present invention comprises an electrically grounded cylindrical shield shell and a cylindrical shield ring that sandwiches and fixes the end of the braided body in the shield wire between itself and the shield shell, wherein the shield shell has a crimping portion on its outer circumferential surface facing the shield ring, with concave serrations formed on the surface that sandwiches the end of the braided body. [Effects of the Invention]

[0007] The braided body fixing structure and shield connector according to the present invention have the effect of improving the fixing strength of the braided body to the shield shell. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view showing a schematic configuration of a shielded connector to which the braided fixing structure according to the embodiment is applied. [Figure 2] Figure 2 is an exploded perspective view showing a schematic configuration of a shield connector to which the braided fixing structure according to the embodiment is applied. [Figure 3] Figure 3 is a perspective view showing the schematic configuration of the shield shell in the embodiment. [Figure 4] Figure 4 is a cross-sectional view of a shielded connector to which the braided fixing structure according to the embodiment is applied. [Figure 5] Figure 5 is a schematic, partially enlarged cross-sectional view illustrating the braided structure fixed to the shield shell. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the embodiments described below. That is, the components in the embodiments described below include those that are easily conceivable by those skilled in the art, or that are substantially the same, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention.

[0010] Furthermore, in the following explanation, the X direction in the diagram will be referred to as the "axial direction X," the Y direction as the "major axis direction Y," and the Z direction as the "minor axis direction Z." The "axial direction X," "major axis direction Y," and "minor axis direction Z" are assumed to be mutually orthogonal. Unless otherwise specified, the directions used in the following explanation refer to the directions when the parts are assembled together.

[0011] [Embodiment] The shielded connector 1 according to this embodiment, shown in Figure 1, is incorporated into a wire harness WH routed in a vehicle such as an automobile. Here, the wire harness WH is a bundle of electric wires W and shielded electric wires SW used for power supply and signal communication to connect various devices mounted on a vehicle, and the electric wires W etc. are connected to each device by connectors including the shielded connector 1. The wire harness WH of this embodiment is composed of, for example, a conductive shielded electric wire SW and a shielded connector 1 provided at the end of the shielded electric wire SW. Furthermore, the shielded connector 1 of this embodiment is fitted with a fixing structure 10 of a braided body 20 for fixing the shielded electric wire SW to the shielded connector 1. In addition, the wire harness WH may also be composed of various other components such as grommets, protectors, and fasteners.

[0012] First, let's describe the shielded cable SW. The shielded cable SW is a so-called shielded cable, in which an insulated wire W is covered by a braided body 20. The shielded cable SW extends along the axial direction X and is provided with a shielded connector 1 at each end. The shielded cable SW is composed of, for example, two wires W and a braided body 20 that covers the two wires W.

[0013] The electric wire W is, for example, an insulated electric wire in which a core wire (not shown) made of multiple conductive metal strands bundled together is covered with an insulating coating (not shown). Terminals T are provided at the end of each electric wire W (see Figure 2). The terminals T are made of a conductive metal material and are connected to the connecting terminal provided on the mating object 100, thereby electrically connecting the electric wire W and the mating object 100. The mating object 100 includes, for example, equipment to be connected that is mounted on a vehicle.

[0014] The braided body 20 is formed by weaving together braided wires made of a conductive metallic material. As shown in Figures 1 and 2, the braided body 20 is formed in a substantially cylindrical shape along the axial direction X. Specifically, the braided body 20 has a tip portion 21 located on the tip side in the axial direction X, a base portion 22 located on the base side in the axial direction X, and a reduced diameter portion 23 located between the tip portion 21 and the base portion 22. The tip portion 21 has an end 21a formed on the tip side in the axial direction X, and has an opening formed by the end 21a. The size (radial length) of the tip portion 21 is formed to be larger than the size (radial length) of the base portion 22. The reduced diameter portion 23 gradually decreases in size (radial length) from the tip side to the base side in the axial direction X. The braided body 20 is positioned on the outside of the shield shell 3, which will be described later, and is assembled so that its end portion 21a covers the outer surface 32 of the shield shell 3, thereby housing a portion of the electric wire W extending from the housing 2 inside.

[0015] Next, the shield connector 1 will be described. The shield connector 1 holds a terminal T provided at the end of the shield wire SW, is formed to be matable with the mating target 100, and is grounded when mated with the mating target 100. The shield connector 1 of this embodiment mainly consists of a housing 2, a shield shell 3, and a shield ring 4.

[0016] The housing 2 is formed to be capable of fitting to the fitting target 100 and holds inside the terminal T provided at the end of the shielded wire SW. The housing 2 is formed of a synthetic resin material having insulating properties and has a terminal accommodation chamber (not shown) that accommodates and holds the terminal T inside. A part of the housing 2 is accommodated and held in the shield shell 3.

[0017] As shown in FIGS. 2 and 3, the shield shell 3 is formed in a cylindrical shape, accommodates a part of the housing 2 inside, and is electrically grounded in a state where the shield connector 1 is fitted to the fitting target 100. The shield shell 3 is formed of a metal material having conductivity, grounds the shielded wire SW, and suppresses noise, etc. from leaking to the outside of the shield shell 3 by covering the periphery of the shielded wire SW. The shield shell 3 of the present embodiment has, for example, a shell main body portion 30, a wire insertion hole 31 provided in the shell main body portion 30, and a caulking portion 33 provided on the outer peripheral surface 32 of the shell main body portion 30.

[0018] The shell main body portion 30 is a portion where the end portion 21a of the braided body 20 that covers the wire W is caulked and electrically connected. The shell main body portion 30 is integrally formed with the flange portion 30a, and is fixed to the fitting target 100 together with the flange portion 30a, for example, and is grounded through the flange portion 30a.

[0019] The wire insertion hole 31 is a through hole that penetrates the shell main body portion 30 along the axial direction X. The wire insertion hole 31 is provided corresponding to each of the two wires W with respect to the shell main body portion 30, and the wire W is inserted therethrough.

[0020] The clamping portion 33 is a portion where the end portion 21a of the braided body 20 in the shielded electric wire SW is pressure-fixed by clamping the shield ring 4 to the shield shell 3. The cross-sectional shape of the shielded electric wire SW viewed from the axial direction X shown in FIG. 4 is formed in an oval shape having a long axis YO extending in the long axis direction Y orthogonal to the axial direction X and a short axis ZO extending in the short axis direction Z orthogonal to the long axis direction Y. The clamping portion 33 is formed on the outer peripheral surface 32 facing the shield ring 4 with the end portion 21a of the braided body 20 interposed therebetween. The clamping portion 33 is formed so as to be recessed radially inward from the outer peripheral surface 32. The clamping portion 33 is recessed from the outer peripheral surface 32 toward the inner side, and the cross-sectional shape viewed from the radial direction is curved in an arcuate shape. The clamping portion 33 of the present embodiment is formed with a concave serration 34.

[0021] The serration 34 is formed in a circular shape when the clamping portion 33 is viewed from the radial direction, and a plurality of serrations 34 are provided for the clamping portion 33. Although a plurality of serrations 34 are provided for the clamping portion 33 in the present embodiment, it is preferable that they are provided not on the entire circumference of the clamping portion 33 but in a specific region. For example, as shown in FIG. 4, when the clamping portion 33 is divided into a central region 33A and an end region 33B, the density per unit area in the end region 33B is relatively higher than the density per unit area in the central region 33A. For example, in the central region 33A in the present embodiment, there is no serration 34, and the density per unit area in the central region 33A = 0. Here, the central region 33A is a region that extends along the long axis direction Y with the short axis intersection ZC, which is the intersection of the clamping portion 33 and the short axis ZO, as the center in the clamping portion 33. The central region 33A is, for example, a region that is relatively small with respect to the curvature of the end region 33B in the cross-section of the clamping portion 33 viewed from the axial direction X. On the other hand, the end region 33B is a region that is adjacent and continuous on both sides of the central region 33A with respect to the long axis direction Y in the clamping portion 33 and extends toward the long axis intersection YC, which is the intersection of the clamping portion 33 and the long axis YO, along the short axis direction Z. The end region 33B is, for example, a region that is relatively small with respect to the curvature of the end region 33B in the cross-section of the clamping portion 33 viewed from the axial direction X.

[0022] The shield ring 4 is formed in a cylindrical shape and is used to crimp and fix the end 21a of the braided body 20 of the shielded wire SW between itself and the shield shell 3. By tightening the shield ring 4, the end 21a of the braided body 20 is crimped and fixed to the shield shell 3, thereby creating an electrical connection between the shield ring 4, the braided body 20, and the shield shell 3. The shield ring 4 has a ring body portion 40, a tightening portion 41 provided on the ring body portion 40, and a pressing portion 42 provided on the ring body portion 40.

[0023] The ring body portion 40 is formed in a cylindrical shape and is the part that crimps and fixes the end portion 21a of the braided body 20 to the outer circumferential surface 32 of the shield shell 3. The ring body portion 40 has a cross-sectional shape that is approximately oval when viewed from the axial direction X and is positioned to cover the end portion 21a of the braided body 20.

[0024] The clamping portion 41 forms a part of the ring body portion 40 and is a portion that presses the ring body portion 40 radially inward when tightened by an external force. The clamping portion 41 is formed to protrude radially outward from each of the major axis intersection points YC of the ring body portion 40. When the clamping portion 41 is pressed in the tangential direction of the major axis intersection points YC, the ring body portion 40 is reduced in diameter radially inward. As a result, the ring body portion 40 is pressed against the outer circumferential surface 32 of the shield shell 3 via the end 21a of the braided body 20.

[0025] The pressing portion 42 is a part formed to protrude radially inward along the inner circumferential surface of the ring body portion 40. The pressing portion 42 is formed on the ring body portion 40 other than the fastening portion 41. The pressing portion 42 is formed to protrude toward the inside of the ring body portion 40, and its cross-sectional shape, when viewed radially, is curved in an arc shape. The pressing portion 42 is formed in a position opposite the crimping portion 33 of the outer circumferential surface 32 of the shield shell 3 when the shield ring 4 is facing the outer circumferential surface 32 of the shield shell 3 with the end portion 21a of the braided body 20 in between. When the fastening portion 41 is tightened, the pressing portion 42 presses the end portion 21a of the braided body 20 against the crimping portion 33 of the shield shell 3.

[0026] As described above, the shield connector 1 has a fixing structure 10 applied to the portion where the end 21a of the braided body 20 is fixed. This fixing structure 10 is a structure for properly fixing the braided body 20 of the shield wire SW to the shield connector 1, and is composed of the shield shell 3 and the shield ring 4 described above. Furthermore, as described above, the fixing structure 10 of this embodiment has serrations 34 formed on the crimping portion 33 of the shield shell 3, thereby realizing a structure that improves the fixing strength of the braided body 20.

[0027] The operation of the fixing structure 10 for the braided body 20 will be explained in more detail with reference to Figures 4 and 5. In the fixing structure 10 for the braided body 20, the end portion 21a of the braided body 20 is sandwiched between the shield shell 3 and the shield ring 4, and pressure is applied to each of the clamping portions 41 in the manner described above. As a result, the ring body portion 40 of the shield ring 4 is reduced in diameter, and the shield ring 4 is pressed against the end portion 21a of the braided body 20. The braided body 20 is pressed radially inward by the tightening of the shield ring 4, and its surface deforms so that it flows inward towards each serration 34 provided on the crimping portion 33 (see Figure 5). In this way, with the fixing structure 10 for the braided body 20, the braided body 20 is crimped by the shield ring 4, and a part of it fits into the serration 34 of the shield shell 3, thereby improving the fixing strength of the braided body 20 to the shield shell 3 in the axial direction X and circumferential direction compared to the conventional method.

[0028] As described above, the fixing structure 10 for the shield connector 1 and the braided body 20 according to this embodiment is a structure in which the end portion 21a of the braided body 20 in the shielded wire SW is sandwiched and fixed between the shield ring 4 and the shield shell 3, and the shield shell 3 has a crimping portion 33 on its outer peripheral surface 32 that faces the shield ring 4 with the end portion 21a of the braided body 20 in between, with concave serrations 34 formed thereon.

[0029] With the above configuration, the fixing structure 10 for the shield connector 1 and the braided body 20 has the advantage that, compared to conventional designs, a portion of the braided body 20, which is crimped by the shield ring 4, fits into the concave serrations 34 provided on the crimping portion 33, causing the braided body 20 to be pressed radially inward against the shield shell 3. As a result, the fixing structure 10 for the shield connector 1 and the braided body 20 can improve the fixing strength of the braided body 20 to the shield shell 3. Furthermore, by providing the serrations 34 on the shield shell 3 instead of the shield ring 4, the fixing structure 10 for the shield connector 1 and the braided body 20 makes it easier to manufacture the parts than manufacturing a new shield ring or adding serrations to the shield ring 4, thus suppressing an increase in parts costs.

[0030] Furthermore, the crimping portion 33 has an oval cross-sectional shape when viewed from the axial direction X, and has a central region 33A that extends along the longitudinal direction Y with the short axis intersection ZC as the center, and an end region 33B that is adjacent to and continuous with both sides of the central region 33A with respect to the longitudinal direction Y, and extends toward the longitudinal axis intersection YC along the short axis Z. Multiple serrations 34 are provided on the crimping portion 33, and the density per unit area of ​​the multiple serrations 34 in the end region 33B is relatively higher than the density per unit area in the central region 33A. As a result, the fixing structure 10 of the shield connector 1 and the braided body 20 can more reliably improve the fixing strength by providing serrations 34 in particular in the end region 33B where the radial compression amount of the braided body 20 tends to be relatively high when the shield ring 4 is crimped. Furthermore, in the central region 33A, where the radial compression of the braided body 20 is relatively lower than that of the end region 33B, the number of serrations 34 can be reduced to ensure a higher compression density, thereby improving the bonding strength more efficiently and appropriately.

[0031] In the above description, the serrations 34 are formed in a circular shape, but this is not limited to that. For example, the serrations 34 may be square, triangular, or elliptical. Also, the multiple serrations 34 may be arranged at equal intervals or at unequal intervals. Furthermore, the density per unit area of ​​the multiple serrations 34 in the central region 33A is assumed to be 0, but this is not limited to that.

[0032] Furthermore, in the above embodiment, a difference in density per unit area of ​​the multiple serrations 34 is provided between the central region 33A and the end region 33B. However, it is not necessary to provide a difference in density, and the multiple serrations 34 may be uniformly provided across the entire crimped portion 33.

[0033] Furthermore, the shield connector 1 and the fixing structure 10 for the braided body 20 according to the embodiments of the present invention described above are not limited to the embodiments described above, and various modifications are possible within the scope of the claims.

[0034] Furthermore, the shield connector 1 and the fixing structure 10 for the braided body 20 according to this embodiment may be constructed by appropriately combining the components of the embodiments and modified examples described above. [Explanation of Symbols]

[0035] 1 Shielded connector 3 Shield Shell 4 Shield Rings 10 Fixed structure 20 Braid body 21a End 32 Outer surface 33 Crimping section 34 serrations 100 Matching objects T terminal W electric wire

Claims

1. A cylindrical shield shell that is electrically grounded, It comprises a shield ring formed in a cylindrical shape, which sandwiches and secures the end of the braided body of the shielded wire between itself and the shield shell, The aforementioned shield shell is The braided body has a crimping portion on its outer surface facing the shield ring, with concave serrations formed on the outer surface that sandwiches the end of the braided body. A fixing structure for a braided body characterized by the following features.

2. The crimping portion is, The cross-sectional shape of the shield wire, as viewed from the axial direction, is formed as an oval, having a major axis extending in the direction perpendicular to the axial direction and a minor axis extending in the direction perpendicular to the direction perpendicular to the major axis. A central region extending along the longitudinal axis, centered on the short axis intersection point which is the intersection point between the crimping portion and the short axis, It has an end region that is adjacent to and continuous with both sides of the central region in the direction of the long axis, and extends toward the long axis intersection side which is the intersection point between the crimping portion and the long axis in the direction of the short axis, The serrations are formed in a circular shape and are provided in multiple locations. The density per unit area in the end regions of the multiple serrations is relatively higher than the density per unit area in the central region. The fixing structure for a braided body according to claim 1.

3. A housing formed to be matable with respect to a mating object and holding a terminal provided at the end of a shielded wire, A cylindrical shield shell that houses a portion of the housing internally and is electrically grounded when fitted to the mating object, It comprises a shield ring formed in a cylindrical shape, which sandwiches and secures the end of the braided body of the shielded wire between itself and the shield shell, The aforementioned shield shell is The braided body has a crimping portion on its outer surface facing the shield ring, with concave serrations formed on the outer surface that sandwiches the end of the braided body. A shielded connector characterized by the following features.

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