Shield structure and method for manufacturing shield shell

Abstract

To provide a shield structure and a method for manufacturing a shield shell which improve fixing position accuracy to a mounting object of a vehicle, while regulating rotation of the shield shell.SOLUTION: A shield structure 1 includes a shield shell 2 having a cylindrical shell body 21 which has at least one wall 21B and constitutes a shield space 20, and a vehicle body fastening part 22 which is continuous on the one wall through a step 24A, extends in an axial direction of the shell body 21 and is bolt-fastened to a mounting object 10, wherein the mounting object 10 has an overlapping surface 11A overlapping the vehicle body fastening part so that they oppose each other, and a pair of inner surfaces 12A and 12A which are erected from the overlapping surface and oppose each other, the vehicle body fastening part 22 has a pair of contact surfaces 22B and 22B which are provided on the end face in a plate-like fastening part body 220 and can be brought into contact with the inner surface of the mounting object, and the pair of contact surfaces are provided so as to be brought into contact with the pair of inner surfaces, in a state in which the fastening part body overlaps the overlapping surface.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a shield structure and a method for manufacturing a shield shell. [Background technology]

[0002] A wide variety of electronic devices are mounted in automobiles, and wire harnesses are arranged to transmit power, control signals, etc. to the electronic devices. The wire harness includes a plurality of electric wires and connectors, and is connected to the electronic devices and other wire harnesses by fitting the connectors to the connectors of the electronic devices or the connectors of other wire harnesses.

[0003] Such a wire harness may be configured to include a shielding structure that is fixed to a metallic mounting target in a vehicle body to form a shielding circuit (see, for example, Patent Document 1). One example of the shielding structure includes a metallic shielding shell that is supported at a predetermined position of the electric wire and has a shielding space. Fig. 9 is a perspective view showing an example of a conventional shielding structure 101.

[0004] As shown in FIG. 9, the shield shell 102 comprises a cylindrical shell main body 121 which defines a shielded space, a plate-shaped vehicle body fixing part 122 which is provided contiguous with the shell main body 121 and which overlaps and is fixed to the vehicle body, and a protrusion 123 which is provided at the tip of the vehicle body fixing part 122 away from the shell main body 121 and which is bent so as to hook onto a step part 111 of an attachment object 110 on the vehicle body.

[0005] When fixing such a conventional shield structure 101 to an object to be attached 110, when the shield shell 102 is bolted to the object to be attached, the protrusion 123 of the shield shell 102 is hooked onto the step portion 111 of the object to be attached 110, thereby restricting the rotation of the shield shell 102 and fixing the shield shell 102 in an appropriate position in the rotational direction. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2017-092418 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the conventional shield structure 101, the protrusion 123 of the shield shell 102 has low strength in the rotation direction about the bolt axis, and there was a concern that it would be deformed when a force in the rotation direction acts on it. For this reason, the shield shell 102 is displaced in the rotation direction, making it difficult to fix the shield shell 102 in an appropriate position.

[0008] An object of the present invention is to provide a shield structure and a manufacturing method for a shield shell that improve the accuracy of the fixed position to an attachment target on a vehicle body while restricting rotation of the shield shell. [Means for solving the problem]

[0009] In order to solve the above problems and achieve the object, the present invention provides a shield structure that is fixed to an attachment target of a vehicle body, the shield structure comprising: a cylindrical shell body having at least one wall to define a shielded space; and a plate-shaped vehicle body fastening portion that is continuous with the one wall via a step, extends in the axial direction of the shell body, and is fastened to the attachment target with a bolt, the attachment target having an overlapping surface that overlaps with the vehicle body fastening portion, and a pair of inner surfaces that stand up from the overlapping surface and face each other, the vehicle body fastening portion having a plate-shaped fastening portion main body, a bolt hole provided in the fastening portion main body through which a bolt is inserted, and a pair of abutment surfaces that are provided on an end surface of the fastening portion main body in an orthogonal direction perpendicular to the axis of the shell body and can abut against the inner surfaces, the pair of abutment surfaces being provided in contact with the pair of inner surfaces when the fastening portion main body is overlapped with the overlapping surface. The present invention also relates to a shield shell manufacturing method for manufacturing a shield shell, the method comprising: a deep drawing step of forming a deep drawn material having a tubular portion by subjecting a metal plate to cylindrical drawing; a flange-shaped portion manufacturing step of forming a flange-shaped portion that continues in a flange-like shape around the periphery of the tubular portion by subjecting the deep drawn material to punching; and a step manufacturing step of bending the flange-shaped portion at a position spaced from the tubular portion to form a step. Effect of the Invention

[0010] According to the present invention, it is possible to improve the accuracy of the fixed position on the mounting object of the vehicle body while restricting the rotation of the shield shell. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view showing a shield structure according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a perspective view showing a shield shell that constitutes the shield structure. [Diagram 3] 1A is a front view of the shield shell, and FIG. 1B is a cross-sectional view taken along line II in FIG. [Figure 4] 1 is a diagram for explaining a deep drawing step in the manufacturing method for manufacturing the shield shell, and is a diagram showing a formed material (deep drawn formed material) manufactured by the deep drawing step as viewed from the drawing direction. FIG. [Diagram 5] FIG. 13 is a diagram for explaining the vehicle body fastening portion manufacturing process in the manufacturing method for manufacturing the shield shell, in which (A) is a diagram of the molded material manufactured by the vehicle body fastening portion manufacturing process viewed from a radial direction perpendicular to the drawing direction, and (B) is a diagram of (A) viewed from the drawing direction. [Figure 6] 1 is a view of a formed material manufactured by a step manufacturing process in the manufacturing method for the shield shell, viewed from a radial direction perpendicular to the drawing direction. FIG. [Figure 7]FIG. 4 is an exploded perspective view of the shield structure, illustrating how the shield shell is fastened with bolts to an attachment target on a vehicle body. [Figure 8] 8 is a diagram showing a process subsequent to that shown in FIG. 7, and is a plan view of the shielding structure as viewed from above. [Figure 9] FIG. 1 is a perspective view showing an example of a conventional shield structure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing a shield structure 1 according to an embodiment of the present invention. Fig. 2 is a perspective view showing a shield shell 2 constituting the shield structure 1. The shield structure 1 shown in Fig. 1 etc. constitutes a wire harness arranged in an automobile or the like, and constitutes a shield circuit that shields electrical noise leaking to the outside from an electric wire that transmits a control signal or the like, or electrical noise flowing in from the outside.

[0013] As shown in FIG. 1, the shielding structure 1 of this embodiment is supported at a predetermined position of an electric wire (not shown) and fixed to a metal mounting object 10 on a vehicle body to form a shielding circuit, and as shown in FIGS. 1 and 2, comprises a cylindrical shielding shell 2 having a shielding space 20, and a housing (not shown) that holds the electric wire and is inserted into the shielding space 20.

[0014] In the following, the axial direction of the shield shell 2 will be referred to as the "front-to-back direction" and indicated by the "arrow Y", the direction perpendicular to the arrow Y and in which a pair of inner surfaces 12A, 12A (described below) of the attachment object 10 face each other will be referred to as the "left-to-right direction" or "width direction" and indicated by the "arrow X", and the direction perpendicular to the arrows X and Y will be referred to as the "up-down direction" and indicated by the "arrow Z".

[0015] As shown in Figs. 1 and 7, the mounting target 10 includes a first wall 11 having an overlapping surface 11A that faces and overlaps with a vehicle body fastening portion 22 of the shield shell 2, which will be described later, and a pair of second walls 12, 12 that are erected from the first wall 11 and have surfaces (inner surfaces) 12A that face each other. In this embodiment, the overlapping surface 11A is configured as a flat surface that includes the front-rear direction Y and the left-right direction X. Furthermore, the inner surfaces 12A of each of the pair of second walls 12, 12 are configured as flat surfaces that include the up-down direction Z and the front-rear direction Y. Furthermore, as shown in Fig. 7, the mounting target 10 includes a bolt shank 13A of a bolt 13, which will be described later, that is provided to extend through the first wall 11 and stand from the overlapping surface 11A. The bolt 13 is configured to include a bolt shank 13A and a bolt head 13B provided at an end of the bolt shank 13A.

[0016] The shield shell 2 is formed by pressing a conductive metal plate. As shown in Fig. 2, the shield shell 2 includes a cylindrical shell body 21 that defines a shielded space 20, a plate-shaped vehicle body fastening portion 22 that is provided on one side (the front Y1) of the shell body 21 and fastened with a bolt to an object 10 to be attached, a cylindrical portion 23 that is continuous with the other side (the rear Y2) of the shell body 21, and a space 24 that includes a step 24A that is provided between the bottom wall 21B of the shell body 21 and the vehicle body fastening portion 22 so as to be continuous with both of them.

[0017] As shown in Figs. 3(A) and 3(B), the shield shell 2 is configured to be symmetrical with respect to an imaginary line P extending in the front-rear direction Y as an axis of symmetry.

[0018] As shown in Figures 3(A) and (B), the shell body 21 comprises a storage section main body 210 formed in a rectangular cylindrical shape with the axis in the front-to-rear direction Y and constituting the shielded space 20, and a blocking wall 211 located at the rear end of the storage section main body 210 and filling the gap with the cylindrical portion 23.

[0019] The storage unit main body 210 is configured to have an upper wall 21A, a bottom wall 21B (one wall), a pair of side walls 21C, 21D, and four curved portions R1, R2, R3, and R4 that are continuous with the four walls 21A, 21B, 21C, and 21D and form corners of the storage unit main body 210. As shown in Fig. 3(A), of the four curved portions R1, R2, R3, and R4, the curved portions R1 and R2 are provided continuously on both sides of the bottom wall 21B in the left-right direction X.

[0020] 2, the vehicle body fastening portion 22 is configured in a plate shape extending in the front-rear direction Y and the left-right direction X, and is provided continuously with the bottom wall 21B of the shell body 21 via a space 24 including a step 24A. In other words, the step 24A, which is a part of the space 24, is provided between the vehicle body fastening portion 22 and the bottom wall 21B of the shell body 21.

[0021] This vehicle body fastening portion 22 comprises a flat fastening portion main body 220, a bolt hole 22A provided in the fastening portion main body 220 through which the bolt shank 13A is inserted, and a pair of abutment surfaces 22B, 22B provided on the fastening portion main body 220 and capable of abutting a pair of inner surfaces 12A, 12A of the object to be attached 10.

[0022] The fastening portion body 220 includes a rectangular portion 221 provided contiguous to the front Y1 of the space 24, and a triangular portion 222 contiguous to the rectangular portion 221 on the front Y1 side.

[0023] The rectangular portion 221 has a constant width and is provided continuously in the forward direction Y1 such that an imaginary line P extends through the center of the rectangular portion 221 in the left-right direction X.

[0024] 5B, the width dimension L1 of the rectangular portion 221 is smaller than the width dimension L2 of the bottom wall 21B of the shell body 21. In other words, both end edges in the left-right direction X of the rectangular portion 221 (positions where the pair of abutment surfaces 22B, 22B are formed) are located inside both end portions P1, P2 in the left-right direction X of the bottom wall 21B of the shell body 21 (boundary positions between the bottom wall 21B and the bent portions R1, R2). Furthermore, the width dimension L1 of the rectangular portion 221 (the dimension between the pair of abutment surfaces 22B, 22B) is configured to be approximately the same as the dimension between the pair of inner surfaces 12A, 12A of the attachment target 10.

[0025] The triangular portion 222 is formed in a triangular shape such that an imaginary line P extends through the center in the left-right direction X and the width dimension gradually decreases toward the front Y1.

[0026] The pair of abutment surfaces 22B, 22B are formed from end surfaces located on both sides in the left-right direction X of the rectangular portion 221, and are formed to have a surface including the front-rear direction Y and the up-down direction Z.

[0027] The bolt hole 22A is provided in the triangular portion 222, and the center of the bolt hole 22A is provided at a position overlapping with the imaginary line P.

[0028] The space 24 includes a step 24A that is continuous with the bottom wall 21B of the shell body 21 and bends to extend downward, and an extension 24B that is provided between the lower end of the step 24A and the rectangular portion 221 of the fastening portion body 220.

[0029] Next, a manufacturing procedure (a shield shell manufacturing method) for manufacturing the shield shell 2 having the above-mentioned configuration will be described with reference to FIGS.

[0030] First, a deep-drawn product 200 having a tubular portion 200A (including the shell body 21 and the cylindrical portion 23) is formed by applying cylindrical drawing to a single metal plate, as shown in FIG. 4 (deep-drawing step).

[0031] Thereafter, the deep drawn material 200 is punched to form the flange-shaped portion 200B that continues in a flange shape around the periphery of the cylindrical portion 200A, and the unnecessary portion 200B1 is cut off (flange-shaped portion manufacturing process). As a result, the vehicle body fastening portion 22 is formed at a position spaced a predetermined distance (the dimension of the gap portion 24 in the front-rear direction Y) from the cylindrical portion 200A, as shown in Figs. 5(A) and (B).

[0032] 5(A), an end 23P of tubular portion 200A remote from flange portion 200B is cut to form an opening through which an electric wire can be inserted at the end of tubular portion 200A remote from flange portion 200B. In this way, shell body 21 and cylindrical portion 23 are formed.

[0033] 5(B) and 6, the flange portion 200B is bent at a position 22P spaced from the cylindrical portion 200A to form a step 24A (step manufacturing process). Although the peripheral portion of the cylindrical portion 200A may be slightly distorted due to the stress caused by the cylindrical drawing process, the provision of the step 24A results in the vehicle body fastening portion 22 being formed at a flat portion of the flange portion 200B and at a position where the dimensions can be controlled. In other words, it is possible to form the width dimension L1 (the dimension between the pair of abutment surfaces 22B) of the rectangular portion 221 of the vehicle body fastening portion 22 to be approximately the same dimension as the dimension between the pair of inner surfaces 12A, 12A of the mounting target 10.

[0034] In this manner, the shielded shell 2 is completed. This shielded shell 2 is applied to the shielded structure 1 of the present embodiment. In the shielded shell 2 completed in this manner, a housing holding the electric wires is inserted into the inside of the shielded space 20, so that the electric wires are supported in predetermined positions.

[0035] Next, a procedure for fastening the shield shell 2 to the object 10 with a bolt will be described with reference to Figs. 7 and 8. The object 10 is in a state in which the bolt shank 13A stands upright from the first wall 11 as shown in Fig. 7.

[0036] 7, the vehicle body fastening portion 22 of the shield shell 2 is brought close to the overlapping surface 11A of the first wall 11 between the pair of second walls 12, 12 of the attachment target 10 in a facing manner, and the bolt hole 22A formed in the vehicle body fastening portion 22 is brought close to the tip of the bolt shank 13A erected from the overlapping surface 11A. The bolt shank 13A is inserted into the bolt hole 22A, and the fastening portion main body 220 of the vehicle body fastening portion 22 is placed on the overlapping surface 11A of the attachment target 10. At this time, the pair of contact surfaces 22B, 22B provided on the vehicle body fastening portion 22 are provided in contact with the inner surface 12A provided on the attachment target 10, respectively.

[0037] Thereafter, the nut N and washer W are brought close to the tip of the bolt shank 13A and screwed into place. As the nut N is screwed into place, the nut N comes into contact with the vehicle body fastening portion 22 via the washer W. At this time, as shown in Fig. 8, a force acts on the vehicle body fastening portion 22 in a direction that rotates the nut N, but the pair of abutment surfaces 22B, 22B of the vehicle body fastening portion 22 contacts the pair of inner surfaces 12A, 12A of the attachment target 10, preventing the vehicle body fastening portion 22 from rotating relative to the attachment target 10, and the vehicle body fastening portion 22 can be placed in a state in which displacement is restricted.

[0038] After that, the screwing advances further, and the first wall 11 of the attachment target 10 and the vehicle body fastening portion 22 are sandwiched between the bolt head 13B and the nut N, thereby fastening the shield shell 2 to the attachment target 10. This forms a shield circuit that blocks electrical noise leaking to the outside from an electric wire that transmits a control signal or the like, or electrical noise flowing in from the outside.

[0039] According to the above-described embodiment, the pair of abutment surfaces 22B, 22B are provided in contact with the pair of inner surfaces 12A, 12A in a state where the fastening portion main body 220 in the vehicle body fastening portion 22 overlaps the overlapping surface 11A of the mounting target 10. According to this, since the pair of abutment surfaces 22B, 22B provided in the vehicle body fastening portion 22 abuts (contacts) the pair of inner surfaces 12A, 12A, when the shield shell 2 is bolt-fastened to the mounting target 10, as the nut N is screwed onto the bolt shank 13A, a force acts on the vehicle body fastening portion 22 in a direction in which the nut N rotates. However, since the pair of abutment surfaces 22B, 22B provided in the vehicle body fastening portion 22 contacts the pair of inner surfaces 12A, 12A provided on the mounting target 10, the rotation of the vehicle body fastening portion 22 with respect to the mounting target 10 is prevented, and the vehicle body fastening portion 22 can be in a state in which displacement is restricted. That is, the shield shell 2 is prevented from rotating relative to the attachment target 10, and the shield shell 2 is fixed at an appropriate position on the attachment target 10. This makes it possible to improve the accuracy of the fixing position on the attachment target 10 of the vehicle body.

[0040] Furthermore, since the protrusion 123 in the conventional technology can be omitted, material costs can be reduced.

[0041] Moreover, the pair of inner surfaces 12A, 12A are provided opposite to each other in the width direction X (orthogonal direction), and the pair of abutment surfaces 22B, 22B are each configured from a plane including the axial direction of the shell body 21. This allows the pair of abutment surfaces 22B, 22B of the vehicle body fastening portion 22 to come into contact with the pair of inner surfaces 12A, 12A with a sufficient contact area, thereby further improving the accuracy of the fixing position to the attachment target 10 of the vehicle body.

[0042] The pair of abutment surfaces 22B, 22B are located inside the boundary positions P1, P2 between the bottom wall 21B and the bent portions R1, R2. Such a vehicle body fastening portion 22 is provided on the shell main body 21 via a step 24A, and is a flat, plate-like portion formed at a position where the dimensions can be controlled. This makes it possible to form the dimension L1 in the width direction X (orthogonal direction) of the vehicle body fastening portion 22 and the dimension between the pair of inner surfaces 12A, 12A of the attachment target 10 to be approximately the same dimension, and therefore the pair of abutment surfaces 22B, 22B of the vehicle body fastening portion 22 are in contact with the pair of inner surfaces 12A, 12A with a sufficient contact area.

[0043] In the manufacturing method for manufacturing such a shield shell 2, after forming the deep drawn material 200 in a deep drawing process, the vehicle body fastening portion 22 is formed in a vehicle body fastening portion manufacturing process, and the step 24A is formed in a step manufacturing process, thereby forming the shield shell 2. Here, the vehicle body fastening portion 22 is provided via the step 24A formed by performing bending processing at a position 22P spaced apart from the cylindrical portion 200A (shell main body 21) in the flange-shaped portion 200B, and is formed in a position where the dimensions can be controlled as a flat, plate-like portion in the flange-shaped portion 200B. This allows the dimension L1 in the width direction (orthogonal direction) of the vehicle body fastening portion 22 to be approximately the same as the dimension between the pair of inner surfaces 12A, 12A of the attachment target 10, and the pair of abutment surfaces 22B, 22B of the vehicle body fastening portion 22 contacts the pair of inner surfaces 12A, 12A with a sufficient contact area, preventing the shield shell 2 from rotating relative to the attachment target 10 and fixing the shield shell 2 at an appropriate position. This allows for improved accuracy in the fixing position of the vehicle body to the attachment target 10.

[0044] In addition, the best configurations and methods for implementing the present invention are disclosed in the above description, but the present invention is not limited thereto. That is, the present invention has been mainly illustrated and described with reference to specific embodiments, but those skilled in the art can make various modifications to the above-described embodiments in terms of shape, material, quantity, and other detailed configurations without departing from the scope of the technical idea and purpose of the present invention. Therefore, the descriptions limiting the shapes, materials, etc. disclosed above are illustrative descriptions for the purpose of facilitating understanding of the present invention, and do not limit the present invention, and therefore descriptions of the names of components that are free of some or all of the limitations on the shapes, materials, etc. are included in the present invention. [Explanation of symbols]

[0045] 1. Shield structure 2. Shield Shell 20 Shielded Space 21 Shell body 21B Bottom wall (at least one wall) 21A, 21B, 21C, 21D 4 walls including 1 wall 22 Vehicle body fastening 22A Bolt hole 22B, 22B A pair of contact surfaces 22P Position spaced apart from the cylindrical part 220 Fastening body 24A Step 10 Vehicle body installation target 11A Overlapping Surface 12A, 12A pair of inner surfaces R1, R2, R3, R4 bends P1, P2 End of bottom wall (boundary between one wall and the bend) 200 Deep drawing material 200A Cylindrical section 200B Flange 13 Volts Y Front-rear direction (axial direction of the shell body) X: Width direction, left / right direction (orthogonal to the axis)

Claims

1. A shield structure fixed to an attachment target on a vehicle body, The shield shell includes a cylindrical shell body having at least one wall forming a shielded space, and a plate-shaped vehicle body fastening portion that is continuous with the one wall via a step, extends in an axial direction of the shell body, and is fastened to the mounting target with a bolt, The attachment target has an overlapping surface that faces and overlaps with the vehicle body fastening portion, and a pair of inner surfaces that stand upright from the overlapping surface and face each other, the vehicle body fastening portion has a plate-shaped fastening portion main body, a bolt hole provided in the fastening portion main body and through which a bolt is inserted, and a pair of abutment surfaces provided on an end surface of the fastening portion main body in a direction perpendicular to an axis of the shell main body and capable of abutting against the inner surface, A shield structure, characterized in that the pair of abutment surfaces are provided in contact with the pair of inner surfaces when the fastening portion main body overlaps the overlapping surface.

2. The pair of inner surfaces are provided opposite to each other in the perpendicular direction, 2. The shield structure according to claim 1, wherein the pair of abutment surfaces are each formed of a plane including an axial direction of the shell body.

3. The shell body has four walls including the one wall, and a bent portion between the four walls and contiguous with the walls to form a corner of the shell body, 3. The shield structure according to claim 1, wherein the pair of abutment surfaces are located inside a boundary between the one wall and the bent portion.

4. A shield shell manufacturing method for manufacturing a shield shell, A deep drawing process of forming a deep drawn material having a cylindrical portion by subjecting a metal plate to cylindrical drawing; a flange manufacturing process for forming a flange-shaped portion that is continuous in a flange shape around the periphery of the cylindrical portion by punching the deep drawing material; and a step forming step of bending the flange-shaped portion at a position spaced from the cylindrical portion to form a step.

Images