Shield member terminal structure

Abstract

To provide a shield member terminal structure which can be easily manufactured.SOLUTION: A shield member terminal structure 1 is constructed by: a metal shell 3; a spiral shape member 5; and a braided wire 7 or the like. The spiral shape member 5 is formed by rounding a plate-like member like a spring break. The spiral shape member 5 can be elastically deformed like the spring break. The spiral shape member 5 is inserted from an open part side of the metal shell 3. In such a state, an inner peripheral side of the spiral shape member 5 is rotated in a direction where a spiral shape is expanded, and thus an outer diameter of the spiral shape member 5 is expanded to obtain a wide diameter, and the braided wire 7 can be depressed to an inner surface of the metal shell 3 from an inner surface side in the spiral shape member 5.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a terminal structure of a shield member used, for example, in an automobile or the like.

Background Art

[0002] Conventionally, shielded wires may be used for wires used in automotive wire harnesses in order to suppress the influence of noise generated from the wires on the outside and the influence of external noise on the wires. As such a shielded wire, for example, one in which a braided wire is arranged around the wire is used.

[0003] At the terminal portion of the shielded wire, it is necessary to fix the metal shell used for the connection portion with other devices and the braided wire in a conductive state. In this case, usually, the end portion of the braided wire is placed on the outer peripheral portion of the metal shell, a ring member is arranged on the outer peripheral portion of the braided wire, and the braided wire and the outer peripheral portion of the metal shell are caulked and fixed by pressing (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, since it is necessary to compress the ring member by pressing, a press mold is required for each size and shape of the metal shell. In addition, in order to obtain an appropriate crimping shape (strength), it is necessary to manufacture a plurality of molds in advance and finely adjust the shape. Further, since the tip portion of the braided wire is placed on the metal shell, the tip portion of the braided wire is exposed to the outside, and there is a risk that the braided wire may fray or the tip of the braided wire may hit the operator.

[0006] The present invention has been made in view of such problems, and an object thereof is to provide a shield member terminal structure that is easy to manufacture.

Means for Solving the Problems

[0007] In order to achieve the above object, the present invention is a shield member terminal structure, comprising: a metal shell; a braided wire whose end is inserted inside the metal shell; and a fixing member that presses and fixes the braided wire from the inside of the braided wire to the inner surface of the metal shell. The shield member terminal structure is characterized by comprising these components.

[0008] A groove may be formed on the inner surface of the metal shell, and the fixing member may be disposed in the groove.

[0009] The fixing member is a spiral member that can expand in diameter, and the spiral member may be expanded in diameter inside the braided wire so that the braided wire is pressed against the inner surface of the metal shell.

[0010] An uneven shape may be formed on the surface of the spiral member, and the convex and concave portions of the overlapping spiral members may be engageable. By engaging the convex and concave portions in a state where the spiral member is expanded in diameter, it may be possible to maintain the expanded state.

[0011] The fixing member is a spiral member, and the spiral member may be expanded in diameter inside the braided wire so that the braided wire is pressed against the inner surface of the metal shell.

[0012] The fixing member is a C-shaped member, and the C-shaped member may be expanded in diameter inside the braided wire so that the braided wire is pressed against the inner surface of the metal shell.

[0013] According to the present invention, since the braided wire is disposed inside the metal shell and the fixing member is expanded in diameter from the inside to press and fix the braided wire against the inner surface of the metal shell, a press mold as in the prior art is not required. Further, since the end portion of the braided wire is not exposed on the outer surface, it is also easy to handle.

[0014] Moreover, by providing a groove on the inner surface of the metal shell, the fixing member can be disposed in the groove, the fixing member can be more reliably fixed inside the metal shell, and the fixing member can be prevented from coming off or the like.

[0015] As such a fixing member, a spiral member can be used. By rotating the spiral member having a spiral spring shape in the direction opposite to the direction of winding the spiral spring, the spiral member can be expanded in diameter and the braided wire can be pressed against the inner surface side of the metal shell for fixing.

[0016] At this time, by forming concavo-convex shapes that can engage with each other on the surface of the spiral member, the concavo-convex shapes on the outer peripheral side and the inner peripheral side can be engaged to maintain the expanded diameter state of the spiral member.

[0017] Also, as the fixing member, a helical member can be used. By using a helical member having a helical shape and expanding it from the inside, the helical member can be expanded in diameter and the braided wire can be pressed against the inner surface side of the metal shell for fixing.

[0018] Also, as the fixing member, a C-shaped member can be used. By using the C-shaped member and expanding it from the inside, the C-shaped member can be expanded in diameter and the braided wire can be pressed against the inner surface side of the metal shell for fixing.

Advantages of the Invention

[0019] According to the present invention, a shield member terminal structure that is easy to manufacture can be provided.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the shield member terminal structure 1. As shown in FIG. 1, the shield member terminal structure 1 is composed of a metal shell 3, a spiral member 5, a braided wire 7, etc.

[0022] The metal shell 3 is a substantially cylindrical member made of metal and is used for connection with other devices, etc. Note that the metal shell 3 is illustrated as a substantially cylindrical shape for simplicity, but may be a cylindrical shape such as a flat shape (for example, an oval shape), and may also have a fixing portion, etc. used for connection with other members.

[0023] The spiral member 5 is formed by winding a plate-like member like a hairspring. The spiral member 5 is elastically deformable like a hairspring. Note that the spiral shape is formed by winding in a plurality of turns so that the diameter gradually increases from the inside to the outside when viewed from the wound axial direction (the left-right direction in the figure). Details of the spiral member 5 will be described later.

[0024] Next, the assembly method of the shield member terminal structure 1 will be described. FIG. 2(a) is a longitudinal cross-sectional view of the metal shell 3 and the braided wire 7. The braided wire 7 is substantially cylindrical and can be deformed arbitrarily. As described above, the metal shell 3 is substantially cylindrical. A groove 9 is formed on the inner surface of the metal shell 3. The groove 9 is formed over the entire circumference on the inner surface of the metal shell 3. In the illustrated example, the portion of the groove 9 is formed thinner than other portions, but the wall thickness may be made substantially constant, and the outer peripheral surface corresponding to the groove 9 may be formed in a convex shape.

[0025] First, as shown in FIG. 2(b), the end of the braided wire 7 is inserted into the metal shell 3. At this time, the braided wire 7 is inserted from one opening side of the metal shell 3 so as to completely cover the groove 9 (up to a position exceeding the groove 9).

[0026] Next, as shown in FIG. 2(c), the spiral member 5 is inserted from the other opening side of the metal shell 3 (the opening opposite to the side where the braided wire 7 is inserted) and arranged at the position of the groove 9. At this time, since the maximum outer diameter of the spiral member 5 is smaller than the inner diameter of the metal shell 3, the spiral member 5 can be easily inserted into the metal shell 3 (braided wire 7). Note that the width of the groove 9 is slightly smaller than the width of the spiral member 5 (the width of the plate-like member).

[0027] FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2(c). As described above, the spiral member 5 is a member formed in a spiral shape when viewed from the axial direction. Here, when viewed from the axial direction, an uneven shape is formed on at least a part of the surface of the spiral member 5 by the concave portion 11a and the convex portion 11b. In the illustrated example, the plate-like member constituting the spiral member 5 is bent to form the convex portion 11b toward the outer surface direction, and the inner surface side of the convex portion 11b becomes the concave portion 11a. The concave portion 11a (convex portion 11b) is formed at least in a predetermined range from the inner peripheral side of the spiral shape at substantially constant intervals over a plurality of turns.

[0028] From this state, by rotating the inner peripheral side of the spiral member 5 in the direction in which the spiral shape expands (the direction of arrow B in the figure, which is the opposite direction to the direction of winding the hairspring), the outer diameter of the spiral member 5 can be expanded and enlarged.

[0029] Figure 4 is a diagram showing an example of a method for expanding the diameter of the spiral member 5. For simplicity, the illustration of the concave portion 11a and the convex portion 11b is omitted. In this embodiment, an expanding jig 13 is used. First, as shown in FIG. 4(a), the expanding jig 13 is disposed on the inner peripheral side of the spiral member 5 at a position eccentric to one side from the center of the metal shell 3. The expanding jig 13 is formed of a material that is difficult to slip with respect to the spiral member 5, such as rubber or resin. In the illustrated example, the expanding jig 13 is substantially circular when viewed from the axial direction.

[0030] From this state, as shown in FIG. 4(b), the expanding jig 13 is relatively moved along the inner surface of the metal shell 3 with respect to the metal shell 3 (in the direction of arrow C in the figure). That is, the expanding jig 13 revolves around the central axis of the metal shell 3 along the inner peripheral surface of the metal shell 3. By moving the expanding jig 13 in the spiral direction (clockwise direction in the figure) of the spiral member 5, the spiral shape of the spiral member 5 is gradually expanded.

[0031] Since the outer peripheral surface of the spiral member 5 is pressed against the inner surface of the metal shell 3, the movement is suppressed by friction. Therefore, the inner peripheral side of the spiral member 5 together with the expanding jig 13 is rotated relative to the outer peripheral side, and the spiral member 5 is expanded in diameter.

[0032] At this time, the expanding jig 13 itself may be rotated (self-rotated) about the central axis of the expanding jig 13 in the same direction as the above-described revolving movement direction. By doing so, the inner peripheral side of the spiral member 5 can be rotated in the direction of expanding the spiral member 5 more reliably. Further, in order to suppress the rotation of the entire spiral member 5, a protrusion or the like may be provided on the outermost peripheral portion of the spiral member 5 and fitted into the concave portion on the inner surface of the metal shell 3.

[0033] Furthermore, as shown in FIGS. 4(c) and 4(d), by revolving and moving the diameter-expanding jig 13 on the inner peripheral side of the spiral member 5, the spiral member 5 is gradually expanded inside the braided wire 7, and the braided wire 7 can be pressed against the inner surface of the metal shell 3 from the inner surface side by the spiral member 5. Finally, by revolving and moving the spiral member 5 in a state where the inner surface of the spiral member 5 is pressed outward by the diameter-expanding jig 13, the diameter of the spiral member 5 can be fully expanded.

[0034] FIG. 5(a) is a diagram showing a state where the spiral member 5 is fully expanded, and FIG. 5(b) is an enlarged view of part D in FIG. 5(a). As described above, the spiral member 5 is formed with a convex portion 11b protruding toward the outer surface side and a concave portion 11a recessed on the inner surface side. Here, the convex portion 11b and the concave portion 11a of the overlapping spiral members 5 can be engaged. Therefore, by engaging the convex portion 11b and the concave portion 11a in a state where the spiral member 5 is expanded in diameter, it is possible to maintain the expanded state.

[0035] In order to more reliably obtain such an effect, it is desirable that the concave portion 11a and the convex portion 11b are formed obliquely in the winding-back direction (counterclockwise in the figure) of the spiral member 5. By doing so, when expanding the spiral member 5, the concave portion 11a and the convex portion 11b do not hinder rotation (sliding of the inner and outer surfaces), and after expansion, the convex portion 11b can fit into the concave portion 11a to suppress rotation (winding back).

[0036] Note that the concave portion 11a and the convex portion 11b may be formed by partially cutting out a part in the width direction instead of bending the plate-like member throughout the width direction. Also, the convex portion 11b protruding from the outer peripheral portion may be formed up to the outermost periphery of the spiral member 5. In this case, the outermost peripheral convex portion 11b bites into the braided wire 7 and functions as a displacement stopper for the braided wire 7.

[0037] As described above, the spiral member 5 fits into the groove 9 of the metal shell 3, and presses the braided wire 7 from the inside of the braided wire 7 to the inner surface (groove 9) of the metal shell 3, so that the braided wire 7 can be fixed to the metal shell 3. That is, the spiral member 5 functions as a fixing member for the braided wire 7 to the metal shell 3.

[0038] As described above, according to the first embodiment, instead of covering the outer peripheral portion of the metal shell 3 with the braided wire 7 and caulking it with a ring member, the braided wire 7 is inserted into the metal shell 3 and pressed and fixed from the inner surface side with the spiral member 5, so that it is not necessary to create a mold for each size of the metal shell 3. Further, since the end portion of the braided wire 7 is disposed inside the metal shell 3, the end portion of the braided wire 7 is not exposed to the outer surface.

[0039] Further, by providing concave portions 11a and convex portions 11b that can engage with each other on the inner and outer surfaces of the spiral member 5, after the spiral member 5 is expanded in diameter, it is possible to suppress the spiral member 5 from being wound back and reduced in diameter, and to maintain the expanded diameter state.

[0040] Further, by forming the groove 9 on the inner surface of the metal shell 3 and the spiral member 5 fitting into the groove 9 and expanding in diameter, the spiral member 5 and the braided wire 7 are prevented from coming off, and the braided wire 7 can be more reliably fixed to the metal shell 3.

[0041] Next, a second embodiment will be described. FIG. 6(a) is a side view of a spiral member 15 which is a fixing member in the second embodiment, and FIG. 6(b) is a front view of the spiral member 15. In the following description, components that exhibit the same functions as those in the first embodiment are denoted by the same reference numerals as those in FIGS. 1 to 5, and duplicate descriptions are omitted.

[0042] The spiral member 15 has a helical shape. Note that the helical shape is formed by being wound in a plurality of turns obliquely with respect to the axial direction with the same diameter with respect to the central axis when viewed from the rounded axial direction (the vertical direction in FIG. 6(a)). The spiral member 15 can be expanded in diameter by plastic deformation.

[0043] Similar to the spiral member 15 and the spiral member 5, first, the braided wire 7 is arranged inside the metal shell 3, and as shown in FIG. 7(a), the spiral member 15 is arranged inside it. The axial length of the spiral member 15 is the length that fits into the groove 9 of the metal shell 3. In this state, by expanding the spiral member 15 from the inside and expanding its diameter (in the E direction in FIG. 7(a)), as shown in FIG. 7(b), a shield member terminal structure 1a can be obtained in which the braided wire 7 is pressed against the inner surface of the metal shell 3 by the spiral member 15.

[0044] FIG. 8 is a diagram showing an example of a method for expanding the diameter of the spiral member 15. First, the end of the braided wire 7 is arranged inside the metal shell 3, and as shown in FIG. 8(a), the spiral member 15 is attached to the tip of the diameter-expanding jig 13a. The diameter-expanding jig 13a has a substantially cylindrical shape and a tapered shape that tapers towards the tip.

[0045] In this state, as shown in FIG. 8(b), the spiral member 15 together with the diameter-expanding jig 13a is inserted into the metal shell 3. The outer diameter of the spiral member 15 is slightly smaller than the inner diameter of the metal shell 3. When the spiral member 15 is inserted up to the position of the groove 9, a part of the spiral member 15 can be fitted into the groove 9, so the movement of the spiral member 15 can be restricted.

[0046] In this state, as shown in FIG. 8(c), by further pushing in the diameter-expanding jig 13a (arrow F in the figure), the spiral member 15 is expanded along the tapered shape of the diameter-expanding jig 13a (arrow G in the figure), and the braided wire 7 can be pressed against the inner surface of the metal shell 3 (groove 9). After expanding the diameter of the spiral member 15 by plastic deformation, the diameter-expanding jig 13a is pulled out to obtain a shield member terminal structure.

[0047] According to the second embodiment, the same effects as those of the first embodiment can be obtained. Thus, as a fixing member for pressing and fixing the braided wire 7 to the inner surface of the metal shell 3, a spiral member may be used.

[0048] Next, a third embodiment will be described. FIG. 9(a) is a view showing a C-shaped member 17 which is a fixing member. The C-shaped member 17 is a member in which a part of a substantially annular member is cut out and is plastically deformable. Note that the cross-sectional shape of the C-shaped member 17 may be flat or circular.

[0049] The C-shaped member 17 can be used in the same manner as the spiral member 15. That is, by expanding the C-shaped member 17 from the inside thereof in the H direction in FIG. 8(b), the braided wire 7 can be pressed against the inner surface of the metal shell 3 by the C-shaped member 17. As a method for expanding the diameter of the C-shaped member 17, for example, a diameter expanding jig 13a can be used in the same manner as the spiral member 15.

[0050] According to the third embodiment, the same effects as those of the first embodiment can be obtained. Thus, as a fixing member for pressing and fixing the braided wire 7 to the inner surface of the metal shell 3, a C-shaped member may be used.

[0051] Note that after expanding the diameter of each of the above-described fixing members using, for example, a diameter expanding jig or the like and then removing the diameter expanding jig or the like, the fixing member may slightly contract in diameter due to springback. However, by bringing the width of the groove 9 close to the width of the fixing member so that the fixing member fits into the groove 9 with the braided wire 7 sandwiched therebetween, the braided wire 7 can be sandwiched and fixed between the fixing member and the groove 9. Further, fitting portions into which both ends of each fixing member can be fitted may be provided inside the groove 9, and the end portions of each fixing member may be fitted to predetermined portions of the groove 9 in the expanded diameter state to maintain the expanded diameter state.

[0052] Also, in each of the above-described embodiments, the end portion of the braided wire 7 is inserted from one opening side of the metal shell 3, but it is not limited thereto. For example, the braided wire 7 may be covered outside the metal shell 3, and the braided wire 7 protruding from the end portion of the metal shell 3 may be folded inward of the metal shell 3, and the vicinity of the end portion of the folded braided wire 7 may be pressed against the inner surface of the metal shell 3 from the inside of the braided wire 7 by each fixing member. Even in this case, the braided wire 7 can be pressed and fixed from the inside of the metal shell 3, and the tip of the braided wire 7 is not exposed to the outside.

[0053] Also, in each of the above-described embodiments, each fixing member is smaller than the inner diameter of the metal shell 3 in the normal state (state where no force is applied), and after being inserted into the metal shell 3, it is expanded in diameter by plastic deformation or elastic deformation, but it is not limited thereto. For example, the outer diameter of each fixing member in the normal state may be made larger than the inner diameter of the metal shell 3, and the fixing member may be inserted into the metal shell 3 (braided wire 7) in a state where the diameter is reduced by elastic deformation with a tool or the like, and then expanded in diameter by the elastic restoring force.

[0054] Also, as described above, the shape of the metal shell 3 may be a flat shape such as an ellipse. In this case, when the fixing member is expanded in diameter, the braided wire 7 does not necessarily need to be pressed over the entire inner circumference of the metal shell 3. That is, the shape when the fixing member is expanded in diameter and the shape of the inner peripheral surface of the metal shell 3 do not necessarily need to match exactly. Further, when the metal shell 3 is an ellipse or the like, the fixing members may be arranged at the arc-shaped portions on both sides, respectively.

[0055] Also, an uneven shape or a roughened treatment portion as an anti-slip for the braided wire 7 may be provided on the inner surface of the metal shell 3 (inner surface of the groove 9). Similarly, an uneven shape or a roughened treatment portion as an anti-slip with the braided wire 7 may be provided on the outer peripheral surface of the fixing member.

[0056] The embodiments of the present invention have been described above with reference to the attached drawings. However, the technical scope of the present invention is not limited by the above-described embodiments. It is obvious that those skilled in the art can conceive of various modification examples or correction examples within the scope of the technical idea described in the claims, and it is naturally understood that those also belong to the technical scope of the present invention.

Explanation of Reference Signs

[0057] 1, 1a……… Shield member terminal structure 3……… Metal shell 5……… Spiral member 7……… Braided wire 9……… Groove 11a……… Recess 11b……… Projection 13, 13a……… Diameter-expanding jig 15……… Helical member 17……… C-shaped member

Claims

1. A shield member terminal structure, comprising: a metal shell; a braided wire whose end is inserted inside the metal shell; a fixing member that presses and fixes the braided wire from the inside of the braided wire to the inner surface of the metal shell; The shield member terminal structure is characterized by comprising the above components.

2. The shield member terminal structure according to claim 1, wherein a groove is formed on the inner surface of the metal shell, and the fixing member is disposed in the groove.

3. The shield member terminal structure according to claim 1, wherein the fixing member is a spiral member that can be expanded in diameter, and the spiral member is expanded in diameter inside the braided wire so that the braided wire is pressed against the inner surface of the metal shell.

4. An uneven shape is formed on the surface of the spiral member, and the convex and concave portions of the overlapping spiral members can be engaged with each other. The shield member terminal structure according to claim 3 is characterized in that the expanded state can be maintained by engaging the convex portion and the concave portion with each other in a state where the spiral member is expanded in diameter.

5. The shield member terminal structure according to claim 1, wherein the fixing member is a spiral member that is expanded in diameter inside the braided wire so that the braided wire is pressed against the inner surface of the metal shell.

6. The shield member terminal structure according to claim 1, wherein the fixing member is a C-shaped member that is expanded in diameter inside the braided wire so that the braided wire is pressed against the inner surface of the metal shell.

Images