JP2015088411A - Ground terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely connect a ground terminal to a body.SOLUTION: A ground terminal 30 is attached to a body 10 by a bolt 20. The body 10 is formed by attaching a non-conductive film 15 to a ground surface 11 of a casing 12 formed from a conductive metal. The ground terminal 30 includes a mesh part 40 that is provided on a coupling surface 39 with the bolt 20 and can be meshed into the ground surface 11 through the non-conductive film 15 with fastening the bolt 20. The mesh part 40 is formed in a cantilever shape by cutting and raising the coupling surface 39 and includes a step 48 in a thickness direction in a distal end portion 43 of this cut and raised part.

Description

  The present invention relates to a ground terminal.

  Generally, in an automobile wire harness or the like, a ground terminal is crimped to a terminal of an electric wire for grounding, and the ground terminal is attached to a predetermined position of the body to take the ground. Usually, the above-mentioned metal body together with a nut fixed in advance by welding to the body of an automobile is painted to prevent corrosion. For this reason, when the ground terminal fitting is attached, the coating film on the body of the attachment portion is peeled off.

  For example, in Patent Document 1, a plurality of scraped portions are provided along the edge of the mounting hole of the ground terminal, and the scraped portions are peeled off so as to scrape the coating film on the upper end surface of the nut. A configuration in which the end face is exposed is described. Thus, the ground terminal and the nut are in contact with each other so as to be conductive.

JP 10-125374 A

  However, in the configuration of Patent Document 1, in the step of peeling the coating film (step of attaching the ground terminal), depending on the state of the coating film, the stripped portion is removed along with the bolt tightening before the metal surface is exposed by peeling off the coating film. There was a possibility that the coating film would not be removed as intended because it was flat. For this reason, the ground terminal may not be reliably connected to the metal surface.

  The present invention has been completed based on the above situation, and an object thereof is to enable a ground terminal to be reliably connected to a body.

  The ground terminal of the present invention is a ground terminal that is attached to a body formed by attaching a non-conductive film to a ground surface of a casing made of a conductive metal, and is provided on a fastening surface with the bolt. And includes a biting portion that can penetrate the non-conductive film and bite into the ground surface when the bolt is tightened, and the biting portion is formed in a cantilever shape by raising the fastening surface. In addition, there is a step in the thickness direction at the tip of the cut and raised portion.

  According to such a configuration, the biting portion provided on the ground terminal penetrates through the non-conductive film such as a paint film and the like and bites into the grounding surface of the body as the bolt is tightened. Even if the cut bite portion becomes flat with the fastening of the bolt before it penetrates the non-conductive film depending on the state of the paint film, etc., the step portion has a non-conductive state. It will penetrate the membrane and bite into the ground plane. Therefore, the ground terminal can be reliably connected to the ground plane.

The following configuration may be adopted as an embodiment of the connector of the present invention.
The bite portion is bent and formed on the body side along a crease that intersects the radial direction of the mounting hole of the ground terminal at the base end portion that is cut and raised, and the step at the tip portion of the cut and raised portion is It is good also as a structure formed by knocking out the center part of the front-end | tip part to the body side.
In this configuration, the ground terminal can be formed from a single plate by forming the step at the tip portion by knocking out.

Further, the biting portion is arranged in a circumferential direction concentric with the mounting hole of the ground terminal, and the proximal end portion of the biting portion is arranged on the inner side in the radial direction, while the distal end of the biting portion It is good also as a structure by which a part is distribute | arranged to the outer side of radial direction.
If comprised in this way, since the hole for cutting and raising goes to an outer peripheral side, a fixed distance can be maintained between a mounting hole and a biting part, and the rigidity between a mounting hole and a biting part is secured. Can do.

Further, the biting portion is arranged in a circumferential direction concentric with the mounting hole of the ground terminal, and the distal end portion of the biting portion is arranged on the inner side in the radial direction, while the proximal end of the biting portion It is good also as a structure by which a part is distribute | arranged to the outer side of radial direction.
If comprised in this way, the front-end | tip part of the biting part cut and raised will face the inner side of radial direction, when the bolt is fastened, the force will be easily applied, and the biting part will bite into the body more.

  According to the present invention, the ground terminal can be reliably connected to the body.

The top view of the ground terminal which concerns on Embodiment 1 of this invention Side view Sectional view at position III-III in FIG. Side view of the biting part viewed from the tip Plan view showing the manufacturing process of the ground terminal Top view of the ground terminal showing the bolt position Sectional view showing the state before bolting Sectional view showing the state during bolting Sectional view showing the bolted state The top view of the ground terminal which concerns on Embodiment 2 of this invention Side view Sectional view at XII-XII position in FIG. Top view of the ground terminal showing the bolt position Sectional view showing the bolted state

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS.
The ground terminal 30 in the present embodiment is attached to the body 10 with the head bolts 20. Hereinafter, in each constituent member, the vertical direction is based on FIGS. 2 and 7. Moreover, about the front-back direction of the ground terminal 30, let the left side of FIG. 2 be the front, and let the electric wire W side be back.

  The body 10 has a metallic casing 12 with good conductivity. As shown in FIGS. 7 to 9, the surface of the casing 12 is a grounding surface 11 for ground connection. The ground surface 11 is coated to prevent corrosion and is covered with a coating film 15. Further, a female screw hole 13 that can be screwed with the headed bolt 20 is formed in the housing 12 of the body 10 so as to open to the ground surface 11.

  As a means for fixing the ground terminal 30 to the body 10, a headed bolt 20 is used as shown in FIGS. The headed bolt 20 has a hexagonal head 21, and a circular washer 23 having a diameter larger than that of the head 21 is integrated. The headed bolt 20 has a shaft portion 25 in which a male screw that can be screwed into the female screw hole 13 is formed.

  Next, the ground terminal 30 will be described with reference to FIGS. The ground terminal 30 is provided with an open barrel type wire barrel 31 and an insulation barrel 33 to which the wire W of the wire harness is crimped. The wire barrel 31 and the insulation barrel 33 are formed with a space therebetween. The wire barrel 31 is caulked to the core wire end of the electric wire W, and the insulation barrel 33 is caulked to the end of the insulating coating of the electric wire W. Further, the wire barrel 31 is formed with a serration 31A (see FIG. 5) for improving the crimping with the core wire in a groove shape.

  Further, the ground terminal 30 is integrally provided with a terminal main body 35 that is connected to the front of the wire barrel 31 and is fastened to the body 10 by the headed bolt 20. The terminal main body 35 has a substantially square plate shape with rounded corners as a whole, and a circular mounting hole 37 is formed at the center thereof. As shown in FIGS. 7 to 9, the mounting hole 37 can be penetrated by the shaft portion 25 of the headed bolt 20, and the inner diameter dimension of the mounting hole 37 is slightly smaller than the outer diameter dimension of the shaft portion 25. Is set to a large dimension. As a result, the hole edge of the mounting hole 37 abuts against the thread of the shaft portion 25, so that the center positions of the headed bolt 20 and the terminal main body portion 35 are kept substantially the same. Yes. Further, a surface arranged around the mounting hole 37 and with which the washer 23 abuts is a fastening surface 39 with the headed bolt 20.

  As shown in FIGS. 2 and 6, a biting portion 40 is formed in the terminal main body portion 35. The biting portion 40 is arranged in the fastening surface 39 in a state of being on the diagonal line of the terminal main body portion 35 and concentrically with the mounting hole 37. The biting portion 40 is formed so as to protrude in a cantilevered manner from the peripheral side of the mounting hole 37 (inside in the radial direction of the mounting hole 37) toward the outer side in the radial direction of the mounting hole 37. The terminal body 35 is formed with a cut-and-raised hole 49 for raising the biting portion 40 in a cantilevered manner. The cut-and-raised hole 49 is formed in a gate shape that opens to the inside in the radial direction of the mounting hole 37, and the cut-and-raised hole 49 has a predetermined width dimension so as to face the outer peripheral edge of the biting portion 40. The hole 49A of the cut-and-raised hole 49 is not in contact. The biting portion 40 is bent obliquely downward (to the body 10 side) along the straight fold line 51 on the base end portion 43 side. As described above, the biting portion 40 is bent obliquely downward at the fold line 51, but since the space is separated from the terminal main body portion 35 by the cut-and-raised hole 49, the biting portion 40 has a headed bolt. When a fastening force of 20 is applied, it is possible to return to flatness without interfering with the terminal main body portion 35. In addition, since the base end part 43 is distribute | arranged inside radial direction, a fixed distance can be maintained between the cut-and-raised hole 49 and the attachment hole 37, and the rigidity of the base end part 43 vicinity is ensured. Can do. Furthermore, since the bite portion 40 has a wider trapezoidal shape on the base end portion 43 side than the tip end portion 45 side, it is easier to ensure the rigidity on the base end portion 43 side.

  The biting portion 40 includes a flat main body portion 41 and a protrusion 47 protruding downward. The protrusion 47 is formed by being knocked out downward (in the body side) in a conical shape within a range from the center position of the fold 51 of the base end portion 43 to the center portion of the distal end portion 45. Therefore, the substantially trapezoidal main body 41 is divided into two by the protrusion 47. Further, as shown in FIG. 4, when the biting portion 40 is viewed from the tip portion 45 side, the protrusion 47 has a protruding shape that is rounded downward. As described above, the thickness of the main body 41 is L1, whereas the thickness of the protrusion 47 is L2, which is larger than the thickness L1 of the main body 41. Therefore, the difference between the plate thickness L1 of the main body 41 and the plate thickness L2 of the protrusion 47 is the protrusion dimension L3 of the step 48 in the plate thickness direction at the tip 45. That is, in the biting portion 40, the main body portion 41 and the protruding portion 47 have a step 48 in the thickness direction at the distal end portion 45. And since the protrusion dimension L3 of the level | step difference 48 in the front-end | tip part 45 is larger than the film thickness of the coating film 15, even if it is a case where the main-body part 41 returns to flatness, the protrusion 47 has the protrusion dimension of the level | step difference 48. Since it protrudes downward by L3, it can penetrate through the coating film 15 and bite into the ground plane 11.

  Next, the manufacturing method of the ground terminal 30 of this embodiment is demonstrated using FIG. In FIG. 5, the left side is an initial process for manufacturing the ground terminal 30, and a press processing line that approaches the finished product as it goes to the right side. The ground terminal 30 is subjected to cutting, bending, and the like in sequence while the hoop material is fed through the press processing line, so that the ground terminal 30 having a predetermined shape is formed. Here, the hoop material is a metal plate such as a copper alloy having excellent conductivity. First, in the first step, the ground terminal 30 is formed with a serration 31A and a protrusion 47 of the wire barrel 31 by hammering. The cut-and-raised hole 49 is punched out while cutting off a part of the protrusion formed when the protrusion 47 is knocked out, so that the biting portion 40 is formed in a cantilever shape. An acute angle portion is formed on the end surface of the protrusion 47 by cutting off a part of the bulge when struck out in this manner. Therefore, it becomes easy to bite into the painted surface 15 and the ground surface 11. Thereafter, the mounting hole 37 is punched, and the outer shape of the ground terminal 30 is punched. Then, the biting portion 40 is bent downward by a linear fold 51, and finally the wire barrel 31 and the like are bent to form the ground terminal 30. The wire W is crimped and connected to the ground terminal 30 formed in this way.

  Then, the ground terminal 30 to which the electric wire W is connected is connected to the body 10 as shown in FIGS. Specifically, as shown in FIG. 7, the ground terminal 30 is disposed on the coating film 15 of the body 10. At this time, the ground terminal 30 is arranged so that the center positions of the female screw hole 13 and the mounting hole 37 are aligned. And the center of the axial part 25 of the headed bolt 20 is aligned so that it may align with the center of the attachment hole 37 grade | etc.,. Then, the headed bolt 20 is tightened so that the male screw of the shaft portion 25 is screwed into the female screw hole 13. Then, as shown in FIG. 8, the lower surface of the washer 23 comes into contact with the fastening surface 39. In this state, when the head bolt 20 is further tightened while rotating, the fastening surface 39 is pushed by the washer 23, whereby the biting portion 40 gradually returns to the flat state, and the protrusion 47 is shown in FIG. As described above, the ground terminal 30 penetrates into the ground surface 11 through the coating film 15, and the ground terminal 30 is fixedly connected to the body 10 by the headed bolt 20. At this time, since the protruding dimension L3 of the step 48 at the tip 45 of the biting portion 40 is larger than the film thickness of the coating film 15, the projection 47 surely bites into the connection surface 11 and the ground terminal 30 is inserted into the body 10. It is possible to connect to each other in a conductive manner.

  In this way, the protrusion 47 of the biting portion 40 penetrates the coating film 15 and bites into the ground surface 11 and is fixedly connected, so that a current can flow directly from the ground terminal 30 to the housing 12. Therefore, since it is possible to pass a current other than the connection by screwing the male screw and female screw hole 13 of the shaft portion 25, the current connection of the ground terminal 30 is stabilized. In addition, since the protrusion 47 of the biting portion 40 directly bites into the grounding surface 11 that is a metal surface, there is a portion that is fixed with metal even when the coating film 15 has a sag or the like. Therefore, rattling to the ground terminal 30 is less likely to occur.

  As described above, according to the present embodiment, the biting portion 40 provided in the ground terminal 30 penetrates the coating film 15 and bites into the grounding surface 11 of the body 10 as the head bolt 20 is tightened. Even if the biting portion 40 cut and raised with the fastening of the head bolt 20 returns to a flat posture before penetrating through the coating film 15, the tip portion 45 has the step 48 caused by the protrusion 47. For this reason, the protrusion 47 penetrates the coating film 15 and bites into the ground contact surface 11. Therefore, the ground terminal 30 can be reliably connected to the ground plane 11.

Further, the biting portion 40 is bent and formed on the side of the body 10 along the fold line 51 that intersects the radial direction of the mounting hole 37 of the ground terminal 30 at the cut-and-raised base end portion 43. The step 48 of 45 is formed by the protrusion 47 in which the center part of the front-end | tip part 45 was knocked out to the body 10 side.
In such a configuration, the ground terminal 30 can be formed from a single plate by forming the stepped portion 48 of the distal end portion 45 by the protruding portion 47 by hammering.

Further, the biting portion 40 is arranged side by side in a circumferential direction concentric with the mounting hole 37 of the ground terminal 30, and the base end portion 43 of the biting portion 40 is arranged on the inner side in the radial direction, while the biting portion 40. It is good also as a structure by which the front-end | tip part 45 is distribute | arranged to the outer side of radial direction.
If comprised in this way, since the cut-and-raised hole 49 for cut-up goes to the outer peripheral side, a fixed distance can be maintained between the mounting hole 37 and the biting part 40, and the The rigidity between them can be secured.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIGS. In the ground terminal fitting 130 of the second embodiment, the biting portion 140 is formed in a different direction from the biting portion 40 of the first embodiment. Since other configurations, operations, and effects are the same as those of the above-described embodiment, the same reference numerals are assigned to the 100s (for example, the ground terminal 30 of the first embodiment is 130 in the second embodiment). The description of the structure, operation, and effect is omitted.

  As shown in FIGS. 10 and 13, a biting portion 140 is formed in the terminal main body portion 135. The biting portion 140 is disposed in the fastening portion 139 in a state of being on the diagonal line of the terminal main body portion 135 and concentrically with the mounting hole 137. The biting portion 140 is formed so as to project in a cantilevered manner from the outer side in the radial direction of the mounting hole 137 toward the inner side in the radial direction of the mounting hole 137. The terminal body 135 is formed with a cut-and-raised hole 149 for raising the biting portion 140 in a cantilevered manner. The cut-and-raised hole 149 is formed in a gate shape that opens to the outside in the radial direction of the mounting hole 137, and the cut-and-raised hole 149 has a predetermined width dimension so as to face the outer peripheral edge of the biting portion 140. The hole edge 149A of the cut-and-raised hole 149 is not in contact. The biting portion 140 is bent obliquely downward (to the body 110 side) along the linear fold line 151 on the base end portion 143 side. Further, as in the first embodiment, a protrusion 147 is formed in the biting part 140.

  When the ground terminal 130 is fixed to the body 110, if the head bolt 120 is further tightened while the lower surface of the washer 123 is in contact with the fastening surface 139, the fastening surface 139 is moved to the washer. As shown in FIG. 14, the projecting portion 147 penetrates the coating film 115 and bites into the ground surface 111, and is grounded by the head bolt 120. 130 is fixedly connected to the body 110. At this time, since the distal end portion 145 is inside the mounting hole 137 in the radial direction, when the head bolt 120 is tightened, the force is easily applied to the distal end portion 145, and the protrusion 147 is likely to bite in. ing.

As described above, according to the present embodiment, the biting portion 140 is arranged side by side in the circumferential direction concentric with the mounting hole 137 of the ground terminal 130, and the leading end portion 145 of the biting portion 140 is on the inner side in the radial direction. On the other hand, the base end portion 143 of the biting portion 140 is disposed on the outer side in the radial direction.
If comprised in this way, the front-end | tip part 145 of the bite-in part 140 cut and raised will face the inner side of radial direction, and when it is fastened with the headed bolt 120, it will become easy to apply the force, and the bite-in part 140 will be more body 110 I will bite into.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) Although the ground terminals 30 and 130 are single in the above embodiment, the structure of the present invention may be used for the ground terminal arranged at the bottom of the bolts that are bolted to a plurality of ground terminals in combination. good.
(2) In the above embodiment, the steps 48 and 148 at the tip portions 45 and 145 of the biting portions 40 and 140 are formed by the protrusions 47 and 147 and the main body portions 41 and 141, but the plates of the main body portions 41 and 141 themselves. A part of the thickness itself may be overlaid or changed by bending or the like.

(3) Although the female screw holes 13 and 113 are formed in the bodies 10 and 110 in the above embodiment, nuts may be welded in advance to the lower side of the grounding surfaces 11 and 111 of the bodies 10 and 110.
(4) In the above embodiment, the headed bolts 20 and 120 are tightened, but a stud bolt may be erected on the body 10 or 110 side and tightened with a nut there.

(5) In the above embodiment, the biting portions 40 and 140 are formed in the fastening surfaces 39 and 139, but it is only necessary that part of the biting portions 40 and 140 is in the fastening surfaces 39 and 139.
(6) In the above embodiment, the head bolts 20 and 120 are provided with washers 23 and 123, but the washers may be separate or may not be used.

(7) In the above embodiment, the number of biting portions 40 and 140 is four, but other numbers may be used. Even in that case, it is better to arrange the biting parts 40 and 140 at equal intervals.
(8) In the above embodiment, the electrical connection is also provided between the shaft portions 25 and 125 and the female screw holes 13 and 113, but the electrical connection between the two may not be required.

(9) In the above embodiment, the non-conductive film is the coating films 15 and 115, but an oxide film or the like formed on the surface of the aluminum casing may be used.
(10) In the above embodiment, the terminal main body portions 35 and 135 of the ground terminals 30 and 130 have a substantially square shape, but may have other shapes such as a circular shape.

DESCRIPTION OF SYMBOLS 10, 110 ... Body 11, 111 ... Grounding surface 12, 112 ... Case 13, 113 ... Female screw hole 15, 115 ... Paint film (non-conductive film)
20, 120 ... Head bolt (bolt)
21, 121 ... heads 23, 123 ... washers 25, 125 ... shaft parts 30, 130 ... ground terminals 35, 135 ... terminal body parts 37, 137 ... mounting holes 39, 139 ... fastening surfaces 40, 140 ... biting parts 41, 141 ... Main body 43, 143 ... Base end 45, 145 ... Tip 47, 147 ... Projection 48, 148 ... Step 49, 149 ... Cut-and-raised hole W ... Electric wire L1 ... Body thickness L2 ... Projection Thickness L3 ... Projection dimension of step

Claims (4)

A ground terminal attached with a bolt to a body in which a non-conductive film is attached to a ground surface of a casing made of conductive metal,
Provided on the fastening surface with the bolt, provided with a biting portion that can penetrate the non-conductive film and bite into the grounding surface as the bolt is tightened,
The biting portion is formed in a cantilever shape by cutting and raising the fastening surface, and a ground terminal having a step in the thickness direction at the tip of the cut and raised portion. The bite portion is bent and formed on the body side along a crease that intersects the radial direction of the mounting hole of the ground terminal at the base end portion that has been cut and raised,
The ground terminal according to claim 1, wherein the step at the leading end of the cut and raised portion is formed by knocking a central portion of the leading end toward the body.   The biting portion is arranged side by side in a circumferential direction concentric with the mounting hole of the ground terminal, and the base end portion of the biting portion is arranged on the inner side in the radial direction, while the distal end portion of the biting portion is The ground terminal according to claim 1, wherein the ground terminal is disposed on an outer side in a radial direction.   The biting portion is arranged side by side in a circumferential direction concentric with the mounting hole of the ground terminal, and a distal end portion of the biting portion is arranged on the inner side in the radial direction, while a base end portion of the biting portion is The ground terminal according to claim 1, wherein the ground terminal is disposed on an outer side in a radial direction.

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