A vehicle body harness ground terminal assembly and method of assembly
By designing square grooves and limiting points on the grounding bolts, combined with rubber plate sealing, the problem of grounding terminal rotation damaging the wiring harness is solved, achieving waterproof and dustproof effects and improving the installation reliability and safety of the vehicle body wiring harness grounding terminals.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA FAW CO LTD
- Filing Date
- 2026-05-20
- Publication Date
- 2026-07-10
AI Technical Summary
The existing vehicle body wiring harness grounding terminals are prone to damage during installation due to the rotation of the nuts, and lack waterproof and dustproof measures, posing a safety hazard.
A grounding bolt is designed with eight square grooves on the upper end of a circular base, and the grounding terminal is a circular cover. The limiting points are vertically matched and sealed with a butyl rubber self-adhesive plate to achieve anti-rotation, waterproofing, and dustproofing.
It solves the problem of wire harness damage caused by the grounding terminal rotating with the nut, and provides waterproof and dustproof effects, improving safety and reliability.
Smart Images
Figure CN122370752A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of automotive technology, and in particular to a body wiring harness grounding terminal assembly and assembly method. Background Technology
[0002] In automotive electrical systems, grounding terminals are crucial components connecting wiring harnesses to the vehicle's metal structure (such as the chassis and engine block), essentially providing a stable negative path for the circuit. Modern automobiles generally employ a single-wire design with a negative ground connection. The positive terminal supplies power via a wire, while the negative terminal connects to the vehicle body via a grounding terminal, utilizing the metal body as a common circuit, significantly reducing wiring complexity. Current grounding terminals typically consist of a grounding bolt and a grounding wiring harness terminal. The grounding bolt is welded to the vehicle body sheet metal, and the grounding terminal hole fits into the bolt. A mounting nut is used to tighten the grounding terminal, ensuring a tight connection and conductor function. A drawback is that, to prevent the grounding terminal from rotating with the grounding nut during installation and tightening, it must be securely connected. The rotating wiring harness is pulled, causing the internal copper wires to break or the crimping joints to loosen; a part of the anti-rotation L-shaped hook extends from the front of the terminal, and the L-shaped hook is locked onto the body sheet metal hole on the other side to prevent the wiring harness terminal from rotating. Therefore, its terminal structure is long and extra, and in terms of process, sheet metal positioning holes must be reserved, and the position must be marked to prevent position and angle deviation, which will make it impossible to install the wiring harness later; at the same time, after the ground terminal and bolt are installed, the surface is exposed and there are no waterproof and dustproof measures. Vehicle water immersion and dust and oil erosion can cause ground short circuits and other safety problems.
[0003] Based on this, the present invention proposes a vehicle body wiring harness grounding terminal assembly and assembly method. Summary of the Invention
[0004] This invention modifies the original grounding bolt, eliminating the L-shaped terminal anti-rotation design and the process of drilling positioning holes in the vehicle body to prevent terminal rotation. When manufacturing the grounding bolt, eight square grooves are created on the upper end of its circular base. The grounding terminal that matches the grounding bolt is a circular cap, slightly larger in diameter than the circular base of the grounding bolt. Four limiting points are cut on the lower end face of the circular cap, perpendicular to the lower end face of the circular cap at a 90-degree angle, thus matching the eight square grooves on the circular base of the grounding bolt. The installation direction can be adjusted according to the position of the wiring harness. This solves the problem of the terminal damaging the wiring harness when rotating the grounding terminal with the cap-type grounding nut, and also eliminates the need for drilling holes in the vehicle body sheet metal for positioning. Furthermore, airtight insulation measures are adopted to ensure the dustproof and waterproof function of the installed grounding terminal, solving the problem of grounding terminals not being waterproof and dustproof.
[0005] This invention provides the following solution:
[0006] In a first aspect, this application discloses a vehicle body wiring harness grounding terminal assembly, comprising:
[0007] The grounding bolt has its bottom welded to the vehicle body panel. The grounding bolt has a circular grounding stud seat on its upper part. A screw rod is provided in the middle of the upper end of the circular grounding stud seat. The upper end of the circular grounding stud seat also has several square grooves, which are evenly distributed on the side of the screw rod.
[0008] Grounding harness terminal, the side end of the grounding harness terminal is connected to the harness, the lower end face of the grounding harness terminal is provided with a number of evenly distributed limiting points, the limiting points are inserted into the square groove, and the middle part of the grounding harness terminal is provided with a screw through hole that passes through the upper and lower ends of the grounding harness terminal.
[0009] A grounding nut is fitted onto the screw rod and screwed to it.
[0010] Preferably, there are 8 square grooves and 4 limiting points.
[0011] Preferably, the square groove has a length range of 1.4-1.6 mm, a width range of 1.4-1.6 mm, and a depth range of 2.4-2.6 mm.
[0012] Preferably, the limiting point is an L-shaped limiting block, the long side of the L-shaped limiting block is disposed on the lower end face of the grounding wire harness terminal, and the short side of the L-shaped limiting block is inserted into the square groove.
[0013] Preferably, the lower end of the grounding harness terminal is a terminal groove, the center of the terminal groove is provided with the screw through hole, and the lower end face of the terminal groove is provided with the limiting point;
[0014] The terminal groove is fitted onto the outside of the circular base of the grounding stud.
[0015] Preferably, the upper end of the grounding harness terminal is provided with a plurality of anti-friction points; the anti-friction points abut against the lower end face of the grounding nut.
[0016] Preferably, the device further includes a rubber plate located below the grounding harness terminal and connected to the outer wall of the harness. The rubber plate has a circular seat through hole in the middle for the grounding stud circular seat to pass through. The diameter of the grounding harness terminal is larger than the diameter of the circular seat through hole.
[0017] Preferably, the rubber sheet is a butyl rubber self-adhesive rubber sheet.
[0018] Preferably, the thickness of the butyl rubber self-adhesive rubber sheet is 2mm-3mm.
[0019] Secondly, this application also describes a method for assembling a vehicle wiring harness grounding terminal assembly, used for assembling the aforementioned vehicle wiring harness grounding terminal assembly, the method comprising:
[0020] When installing the grounding harness terminal, the rubber plate passes through the circular grounding stud seat and is positioned below the circular grounding stud seat, contacting the vehicle body panel. Select the appropriate square groove according to the adjustment direction of the harness, insert the limiting point of the grounding harness terminal into the square groove, and tighten the grounding nut on the screw to press down the grounding harness terminal. At this time, the lower end of the grounding harness terminal presses the rubber plate firmly onto the vehicle body panel.
[0021] The edges of the rubber sheet are glued together so that the rubber sheet covers the circular base of the ground stud, the ground wire harness terminal, and the ground nut.
[0022] Compared with the prior art, the present invention has the following advantages:
[0023] 1. In this invention, when manufacturing the grounding bolt, eight square grooves are made on the upper end of its circular base. The grounding terminal that matches the grounding bolt is a circular cover. The diameter of the circular cover is slightly larger than that of the circular base of the grounding bolt. The lower end face of the circular cover has four limiting points in the up, down, left, and right directions. The limiting points are perpendicular to the lower end face of the circular cover at a 90-degree angle, thus matching the eight square grooves of the circular base of the grounding bolt. The installation direction can be adjusted according to the position of the wire harness. In this way, when rotating the grounding nut to install the grounding terminal, the problem of the terminal damaging the wire harness when rotating with the nut is solved, as well as the problem of drilling holes for positioning on the body sheet metal is also solved.
[0024] 2. In this invention, a butyl rubber self-adhesive sheet extends from the insulation and protection part of the wire harness as the grounding terminal. The butyl rubber self-adhesive sheet is located below the grounding terminal, and the root of the rubber sheet is connected to the terminal wire harness. It has a certain thickness, and the diameter of the circular seat through hole of the rubber sheet is slightly larger than the circular seat but smaller than the diameter of the grounding terminal. The rubber sheet first passes through the circular seat of the grounding stud and covers the body panel at the root of the grounding stud. Since the lower edge of the circular cap shape of the grounding terminal is above the butyl rubber sheet at this time, the grounding terminal is tightened and compacted by the cap nut to compact the rubber sheet and seal the root of the grounding bolt. Then, the unfolded part of the butyl rubber self-adhesive sheet is bonded, thereby wrapping the entire exposed part of the grounding bolt and grounding terminal, forming an external insulation and sealing effect that is waterproof and dustproof. Attached Figure Description
[0025] Figure 1 This is a schematic diagram of the overall structure of the vehicle body wiring harness grounding terminal assembly of the present invention;
[0026] Figure 2 This is a front view of the grounding bolt of the present invention;
[0027] Figure 3This is a top view of the grounding bolt of the present invention;
[0028] Figure 4 This is a front view of the grounding harness terminal and rubber plate of the present invention;
[0029] Figure 5 This is a top view of the grounding harness terminal and rubber plate of the present invention;
[0030] 1. Grounding bolt; 11. Grounding stud round seat; 111. Square groove; 12. Threaded rod;
[0031] 2. Grounding harness terminal; 21. Limiting locking point; 22. Screw through hole; 23. Anti-friction point; 24. Raised upper edge;
[0032] 3. Grounding nut; 4. Rubber sheet; 5. Wiring harness. Detailed Implementation
[0033] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0034] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.
[0035] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0036] It should be understood that although the terms first, second, third, etc., may be used in the embodiments of this application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, first may also be referred to as second without departing from the scope of the embodiments of this application, and similarly, second may also be referred to as first.
[0037] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”
[0038] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.
[0039] It should be noted that any symbols and / or numbers present in the specification that are not marked in the accompanying drawings are not reference numerals.
[0040] Existing vehicle body wiring harness grounding terminals use cap nuts for tightening the terminals and grounding bolts. To prevent the grounding terminals from rotating with the nut during tightening, thus avoiding problems such as wire damage, loosening of the crimp, and improper assembly, the front end of the terminal is manufactured in an L-shape, and holes are punched in the vehicle body. Furthermore, the hole position, spacing, and angle must be precisely controlled to prevent incorrect installation direction and ensure the L-shaped grounding terminal can be inserted into the sheet metal positioning hole, thus failing to provide positioning. Repeated installation of the L-shaped portion also increases the risk of breakage. Therefore, the present invention provides a grounding terminal assembly for a vehicle body wiring harness. When manufacturing the grounding bolt, eight square grooves in eight directions are made on the upper end of its circular seat. The grounding terminal that matches the grounding bolt is a circular cover. The diameter of the circular cover is slightly larger than that of the circular seat of the grounding bolt. The lower end face of the circular cover has four limiting points in four directions: up, down, left, and right. The limiting points are perpendicular to the lower end face of the circular cover at a 90-degree angle, thus matching the eight square grooves in the circular seat of the grounding bolt. The installation direction can be adjusted according to the position of the wiring harness. In this way, when rotating the grounding terminal with the cap-type grounding nut, the problem of the terminal damaging the wiring harness when rotating with the nut is solved, as well as the problem of drilling holes for positioning on the vehicle body sheet metal is also solved.
[0041] The existing vehicle body wiring harness grounding terminals have waterproof and flame-retardant treatment on the wiring harness part, but the grounding terminal cannot be waterproofed and dustproofed. First, the sheet metal punching limit and holes make it easy for water to enter when the vehicle is driving through water. Second, the grounding terminal is exposed on the surface, and the gap between the cap-type clamping nut and the grounding terminal is prone to moisture, dust, oxidation and corrosion, which may cause danger. Therefore, in this invention, the grounding terminal extends from the wire harness insulation protection section to form a butyl rubber self-adhesive sheet. The butyl rubber self-adhesive sheet is located below the grounding terminal, and the root of the rubber sheet is connected to the terminal wire harness. It has a certain thickness, and the diameter of the circular seat through hole of the rubber sheet is slightly larger than the circular seat but smaller than the diameter of the grounding terminal. The rubber sheet first passes through the circular seat of the grounding stud and covers the body panel at the root of the grounding stud. Since the lower edge of the circular cap shape of the grounding terminal is located above the butyl rubber sheet at this time, the grounding terminal is tightened and compacted by the cap nut to compact the rubber sheet and seal the root of the grounding bolt. Then, the unfolded part of the butyl rubber self-adhesive sheet is bonded to cover the entire exposed part of the grounding bolt and grounding terminal, forming an external insulation and sealing effect that is waterproof and dustproof.
[0042] Example 1
[0043] See Figure 1-5 As shown, an embodiment of the present invention provides a vehicle body wiring harness grounding terminal assembly, comprising:
[0044] Grounding bolt 1, the bottom of grounding bolt 1 is welded to the body panel, the upper part of grounding bolt 1 is provided with grounding stud circular seat 11, the upper middle part of grounding stud circular seat 11 is provided with screw 12, the upper end of grounding stud circular seat 11 is also provided with several square grooves 111, and several square grooves 111 are evenly distributed on the side of screw 12.
[0045] Grounding wire harness terminal 2, the side end of grounding wire harness terminal 2 is connected to wire harness 5, the lower end face of grounding wire harness terminal 2 is provided with a number of evenly distributed limiting points 21, the limiting points 21 are inserted into the square groove 111, and the middle part of grounding wire harness terminal 2 is provided with a screw through hole 22 that passes through the upper and lower ends of grounding wire harness terminal 2.
[0046] Grounding nut 3 is fitted onto screw rod 12 and screwed to screw rod 12.
[0047] There are 8 square grooves 111 and 4 limiting points 21.
[0048] The length of the square groove 111 ranges from 1.4 to 1.6 mm, the width ranges from 1.4 to 1.6 mm, and the depth ranges from 2.4 to 2.6 mm.
[0049] The limiting point 21 is an L-shaped limiting block. The long side of the L-shaped limiting block is set on the lower end face of the grounding wire harness terminal 2, and the short side of the L-shaped limiting block is inserted into the square groove 111.
[0050] The lower end of the grounding wire harness terminal 2 is a terminal groove, and a screw through hole 22 is provided in the middle of the terminal groove. A limiting locking point 21 is provided on the lower end face of the terminal groove. The terminal groove is sleeved on the grounding stud circular seat 11.
[0051] The upper end of the grounding wire harness terminal 2 is provided with several anti-friction points 23; the anti-friction points 23 abut against the lower end face of the grounding nut 3.
[0052] In this embodiment, the grounding terminal assembly is composed of three parts: a grounding bolt 1, a grounding wire harness terminal 2, and a grounding nut 3. The grounding bolt 1 includes a screw 12, a circular grounding stud seat 11 below the screw 12, and a protrusion below the circular grounding stud seat 11. The external thread of the screw 12 engages with the internal thread of the grounding nut 3 to press down and tighten the grounding terminal 2. The protrusion at the bottom of the circular seat is welded to the vehicle body panel using welding equipment. The bottom surface of the circular seat has square grooves 111 with a length, width, and depth of 1.5mm × 1.5mm × 2.5mm evenly distributed in eight directions. Their function is to prevent the grounding terminal from being damaged by stress, loosening of the crimp, and improper assembly caused by the rotation of the grounding nut 3 during installation. The grounding terminal 2 is cap-shaped, with the lower end of the terminal groove having a higher edge and a deeper center. The diameter of the terminal groove is larger than that of the grounding stud circular seat 2 that it mates with. After tightening, the lower edge of the grounding terminal 2 is lower than the grounding stud circular seat 2, so as to press the butyl rubber self-adhesive rubber sheet 4 onto the vehicle body panel. The grounding terminal 2 has a screw through hole 22 in the middle, with a hole diameter slightly larger than that of the screw 12, so that the grounding terminal 2 can pass through the screw 12.
[0053] The limiting point 21 is used to connect the ground terminal 2 with the circular seat 11 of the ground bolt. The limiting point 21 is an L-shaped plate punched out on the terminal plate. The short side of the L-shaped plate is slightly smaller than the square groove 111. The L-shaped plate is set in four directions and is locked into four of the eight square grooves 111 during installation. The direction can be adjusted arbitrarily according to the needs of the wire harness. The anti-friction point 23 is punched out on the surface of the ground wire harness terminal 2. Its function is to prevent contact with the ground terminal surface when the ground nut 3 is rotated and pressed down, thereby reducing friction and also serving as a spring pad.
[0054] Furthermore, an extended upper edge 24 is provided at the upper edge of the grounding harness terminal 2, which limits and guides the lower end of the grounding nut 3.
[0055] See Figure 4 , 5 As shown, the assembly also includes a rubber plate 4, which is located below the grounding harness terminal 2 and connected to the outer wall of the harness 5. The rubber plate 4 has a circular seat through hole in the middle for the grounding stud circular seat 11 to pass through. The diameter of the grounding harness terminal 2 is larger than the diameter of the circular seat through hole.
[0056] Rubber sheet 4 is a butyl rubber self-adhesive sheet. The thickness of the butyl rubber self-adhesive sheet is 2mm-3mm.
[0057] In this embodiment, the butyl rubber self-adhesive sheet 4 is connected to the wire harness 5, with a thickness of 2mm-3mm. Its overall area is sufficient to cover the grounding bolts and grounding terminals after installation, thus enclosing them. The butyl rubber self-adhesive sheet 4 is located below the grounding terminal 2, which is positioned above it. The butyl rubber self-adhesive sheet 4 has a circular seat through-hole in its center, with a diameter slightly larger than the diameter of the grounding stud circular seat 11, allowing the rubber sheet 4 to pass through and adhere to the vehicle body panel. After tightening the grounding nut, the grounding terminal 2 presses against the rubber sheet. Finally, the butyl rubber self-adhesive sheet covers the grounding bolts and grounding terminals, and then the sheet is bonded to form a sealed enclosure.
[0058] Example 2
[0059] This application provides an assembly method for a vehicle body wiring harness grounding terminal assembly, used to assemble the aforementioned vehicle body wiring harness grounding terminal assembly. The method includes:
[0060] When installing the grounding harness terminal 2, the rubber plate 4 passes through the grounding stud round seat 11 and is located below the grounding stud round seat 11, contacting the body panel; select the appropriate position of the square groove 111 according to the adjustment direction of the harness, insert the limiting point 21 of the grounding harness terminal 2 into the square groove 111, and tighten the grounding nut 3 on the screw 12 to press down the grounding harness terminal 2. At this time, the lower end of the grounding harness terminal 2 presses the rubber plate 4 onto the body panel;
[0061] The edges of the rubber sheet 4 are glued together so that the rubber sheet covers the grounding stud circular seat 11, the grounding wire harness terminal 2 and the grounding nut 3.
[0062] During use, the grounding bolt 1 is welded to the body panel during the welding stage, and the grounding nut 3 is pre-installed. When installing the wiring harness grounding during the final assembly stage, the grounding nut 3 is removed with a tool, and the grounding terminal 2 is installed on the grounding bolt 1. The direction is adjusted according to the wiring harness so that the limiting point 21 is inserted into the appropriate square groove 111. The grounding nut 3 and the grounding bolt 1 are tightened with a tool. At this time, the grounding nut 3 presses down on the grounding terminal 2, and the lower outer edge of the grounding terminal is pressed onto the butyl rubber self-adhesive rubber sheet 4. The butyl rubber self-adhesive rubber sheet 4 and the body panel form a closed space. Then, the other parts of the butyl rubber self-adhesive rubber sheet 4 are flipped up to cover the grounding stud round seat 11, the grounding wiring harness terminal 2 and the grounding nut 3. Finally, they are pasted into a sealed package, so that the grounding terminal and the stud of the grounding bolt form a sealed environment, which plays a role in dustproofing, moisture-proofing and waterproofing.
[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.
Claims
1. A vehicle body wiring harness grounding terminal assembly, characterized in that, include: Grounding bolt (1), the bottom of which is welded to the body panel, the upper part of which is provided with a grounding stud circular seat (11), the upper middle part of which is provided with a screw (12), the upper end of which is also provided with several square grooves (111), and several square grooves (111) are evenly distributed on the side of the screw (12); Grounding harness terminal (2), the side end of the grounding harness terminal (2) is connected to the harness (5), the lower end face of the grounding harness terminal (2) is provided with a number of evenly distributed limiting points (21), the limiting points (21) are inserted into the square groove (111), and the middle part of the grounding harness terminal (2) is provided with a screw through hole (22) that passes through the upper and lower ends of the grounding harness terminal (2). Grounding nut (3) is sleeved on the screw rod (12) and screwed to the screw rod (12).
2. The vehicle body wiring harness grounding terminal assembly according to claim 1, characterized in that, The square groove (111) has 8 locations, and the limiting point (21) has 4 locations.
3. The vehicle body wiring harness grounding terminal assembly according to claim 2, characterized in that, The square groove (111) has a length range of 1.4-1.6 mm, a width range of 1.4-1.6 mm, and a depth range of 2.4-2.6 mm.
4. The vehicle body wiring harness grounding terminal assembly according to claim 1, characterized in that, The limiting point (21) is an L-shaped limiting block. The long side of the L-shaped limiting block is located on the lower end face of the grounding wire harness terminal (2), and the short side of the L-shaped limiting block is inserted into the square groove (111).
5. The vehicle body wiring harness grounding terminal assembly according to claim 2, characterized in that, The lower end of the grounding harness terminal (2) is a terminal groove, the middle of the terminal groove is provided with the screw through hole (22), and the lower end face of the terminal groove is provided with the limiting point (21). The terminal groove is sleeved outside the circular base (11) of the grounding stud.
6. The vehicle body wiring harness grounding terminal assembly according to claim 1, characterized in that, The upper end of the grounding harness terminal (2) is provided with several anti-friction points (23); the anti-friction points (23) abut against the lower end face of the grounding nut (3).
7. The vehicle body wiring harness grounding terminal assembly according to claim 1, characterized in that, It also includes a rubber plate (4), which is located below the grounding harness terminal (2) and connected to the outer wall of the harness (5). The rubber plate (4) has a circular seat through hole in the middle for the grounding stud circular seat (11) to pass through. The diameter of the grounding harness terminal (2) is larger than the diameter of the circular seat through hole.
8. The vehicle body wiring harness grounding terminal assembly according to claim 1, characterized in that, The rubber sheet (4) is a butyl rubber self-adhesive rubber sheet.
9. The vehicle body wiring harness grounding terminal assembly according to claim 8, characterized in that, The thickness of the butyl rubber self-adhesive sheet is 2mm-3mm.
10. A method for assembling a vehicle body wiring harness grounding terminal assembly, characterized in that, The method for assembling the vehicle wiring harness grounding terminal assembly according to any one of claims 1-9 includes: When installing the grounding harness terminal (2), the rubber plate (4) passes through the grounding stud round seat (11) and is located below the grounding stud round seat (11) in contact with the body panel; select the appropriate position of the square groove (111) according to the harness adjustment direction, insert the limiting point (21) of the grounding harness terminal (2) into the square groove (111), and tighten the grounding nut (3) on the screw (12) to press down the grounding harness terminal (2). At this time, the lower end of the grounding harness terminal (2) presses the rubber plate (4) onto the body panel; The edges of the rubber sheet (4) are glued together so that the rubber sheet (4) covers the ground stud round seat (11), the ground wire harness terminal (2) and the ground nut (3).