JP2946264B2 - Fixing structure for electrical connection bolts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing electric connection bolts for making an electric connection suitable for use in an electric connection box or the like used for connecting a wire harness.

[0002]

2. Description of the Related Art An electric junction box (hereinafter referred to as a junction box) mounts electric components such as a connector, a relay, and a fuse of a wire terminal, and performs a desired circuit connection by a bus bar in the junction box. The bus bar or the wire terminal is a terminal having one end fixed to a box,
For example, some are electrically connected by fixing to bolts. The connection of the bus bar and the like using the electrical connection bolts is described in Japanese Utility Model Application Laid-Open No. 4-29 of the present applicant.
Nos. 165, 4-72818 and the like.

Hereinafter, a conventional structure for fixing a bus bar in a junction box to an electric connection bolt (hereinafter simply referred to as a bolt) will be described with reference to FIGS. FIG. 10 is an exploded perspective view showing a fixing structure, and FIG.
Is a plan view of the boss, and FIG. 12 is a sectional view of the boss. A bolt 3 is integrally molded and fixed to a tip of a boss 2 projecting from the bottom surface of the lower case 1 of the junction box JB. The vertical busbars 6 and 7 connected and fixed by the bolts 3 have connection plate portions 8 and 9 bent and coupled in an L-shape. Each connection plate portion has a through hole 10 through which the bolt 3 passes. , 11 are provided. The upper case 4 to which the bus bars 6 and 7 are attached is provided with an opening 5 through which the bolt 3 and the connection plates 8 and 9 can be inserted. On the other hand, the round terminal 12 is crimped to the end, and the grommet 1
4 are protected by the U of the lower case 1.
It is fitted in the letter-shaped groove 15. Bus bars 6, 7 and electric wire 13
First, the bus bars 6 and 7 are housed in the lower case 1 and are externally inserted into the bolts 3 on the boss 2 so that the connection plates 8 and 9 are overlapped. Then, the round terminal 12 of the terminal of the electric wire 13 fixed by the grommet 14 is extrapolated thereon, the upper case 4 is covered therefrom, the nut 16 is inserted from the opening 5 and screwed into the bolt 3. This completes the fixation.

[0004] The boss 2 shown in FIGS.
0 and is formed integrally with the lower case 1
Bolts 3 are fixed to the tops of the bosses 2 by molding upright. The shape of the bolt 3 is such that the base 3a has a substantially square planar shape, a step 3b having a circular planar shape is formed on the upper surface of the base 3a, and a screw portion 3c is vertically provided at the center of the step 3b. ing. Note that the bottom surface of the base 3a is formed in a concave shape in order to make the connection with the boss 2 more firm. In a state where the bolt 3 is fixed to the boss portion 2 in an upright state,
As shown in FIG. 11 and FIG.
And the upper surface of the step portion 3b is exposed to the upper surface of the boss portion 2. When connecting the bus bars 6, 7 and the connection terminals 12 of the terminals of the electric wires 13 to the boss portion 2, the connection plates 8, 9 and the connection terminals 12 of the bus bars 6, 7 are inserted into the bolts 3 as shown in FIG. , And the nut is fastened to the step 3b. As a result, bus bars 6, 7
The connection terminal 12 is electrically connected to the connection terminal 12 via the bolt 3 so as to be able to conduct electricity.

A description will be given of the action of the force when the bus bars 6 and 7 are fastened and fixed to the bolt 3. The force that the bolt 3 tends to rotate with respect to the tightening torque is based on the base embedded in the boss portion 2. It is pressed by the substantially square outer peripheral surface of the base 3a and the concave inner peripheral surface formed inside the base 3a, and the retaining is performed by the flange portion 2a of the boss portion 2 formed so as to cover the upper part of the base 3a. .

[0006]

In the conventional manufacturing process, when the bolt 3 is fixed to the top of the boss 2, the screw 3 c of the bolt 3 is manually held to form the boss 2. It is fixed to a mold, and at the time of molding, the bolt 3 is also fixed by pressing the bolt 3 from a mold hole 17 formed in the center of the boss portion 2 so that the position does not shift even when pressure due to molding is applied. Therefore, as described above, since the positioning work of the bolt 3 is performed manually, the work involves danger and the work efficiency is extremely poor, and there is a problem in terms of work safety and cost reduction. An object of the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a fixing structure of an electric connection bolt that can be easily assembled without a manual manufacturing process.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is to fix an electric connection bolt which is fixedly connected by superposing a terminal of a power supply or output electric wire and a bus bar in an electric connection box and tightening the bolt. In the structure, a bolt is formed by vertically suspending and fixing an electrical connection bolt on the flat plate portion of a guide member including a flat plate portion formed of a conductive material and a vertical plate portion formed substantially at right angles to the flat plate portion. And a guide plate formed with a guide portion for guiding the insertion of the electrical connection bolt, a bolt insertion hole communicating with the guide portion and inserting the electrical connection bolt, and a lower portion of the guide plate. An opening having a gap into which the flat plate portion can be inserted is formed in the boss portion, and a boss portion for fixing the bolt portion is formed. Further, the above object can be achieved by the fixing structure for an electric connection bolt, wherein a fitting portion for fitting the bus bar is formed at a connection end of the flat plate portion with the vertical plate portion. .

[0008]

In other words, the bolt is fixed to the boss easily by inserting the flat plate constituting the bolt into the opening formed in the boss and simultaneously inserting the electric connection bolt into the guide. . Then, the assembly is completed by pushing the bolt until the electrical connection bolt is completely inserted into the bolt insertion hole formed in the guide plate, or until the front end of the flat plate portion comes into contact with the inner wall portion at the back of the gap. Simultaneously with the completion of the assembly, the vertical plate portion of the bolt portion comes into contact with the outer wall surface of the boss portion. Therefore, there is no need to perform any operation such as manually pressing and positioning the electrical connection bolts, and safety and workability can be improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. It goes without saying that the present invention is not limited to this embodiment. FIG. 1 is a perspective view showing a structure for fixing an electric connection bolt according to a first embodiment of the present invention, FIG. 2 is a plan view showing the shape of the bolt, FIG. 3 is a side view showing the shape of the bolt, and FIG. 5, FIG. 5 is a sectional view taken along the line BB of FIG. 4, FIG. 6 is a perspective view showing a state where the bus bar is assembled, FIG. 7 is a plan view of FIG. 6, and FIG.
FIG. 9 is a perspective view showing a state in which a flat bus bar is assembled.

The fixing structure of the electric connection bolt of the present invention, that is, the fixing structure in which the bolt portion is assembled to the boss portion is as shown in FIG. 1, but for convenience of explanation, FIGS.
, The structure of the boss portion 21 will be described with reference to FIGS. 4 and 5, and finally the boss portion will be described with reference to FIGS. 1 and 6 to 9. A description will be given of a fixing structure and a bus bar assembled to the section.

First, referring to FIG. 2 and FIG.
1 will be described. The bolt portion 31 is composed of a guide member 32 and a bolt 33 formed by being bent into an L-shape. The guide member 32 is a flat plate portion 34 having a width m and a flat plate portion 34 having the bolt 33 suspended substantially at the center. And a vertical plate portion 36 that is bent and extended substantially at a right angle from the end of the vertical plate 36. In the vicinity of the bent position of the flat plate portion 34, a pair of fitting portions 35 having a width n formed in a concave shape are formed, and an end portion of an L-shaped bus bar described later is fitted therein. . The width t of the fitting portion 35 is set according to the thickness of a bus bar or the like to be fitted.
The vertical plate portion 36 is bent and formed substantially at a position apart from the outer wall surface of the boss portion 21 by the width t of the fitting portion 35.
Accordingly, a gap having a width t is formed between the outer wall surface of the boss portion 21 and the vertical plate portion 36 so that the bus bar is sandwiched. The vertical plate portion 36 and the fitting portion 35 prevent rotation of the bolt 33 and the bus bar when fastening the bus bar or the like to the bolt 33 with a nut. The vertical plate portion 36 also has a function of radiating heat generated in the bus bar and the like. Further, the guide member 32 as well as the bolt 33 are formed from a conductive metal plate, and both are integrated by welding or the like.

Next, referring to FIG. 4 and FIG.
The structure of will be described. The boss 21 is formed integrally with the bottom surface of the lower case of the junction box. The basic shape of the boss portion 21 is a rectangular parallelepiped having a substantially square planar shape, and has a structure in which the above-described bolt portion 31 can be inserted and fixed at the top. That is, as shown in FIG. 5, the top portion of the boss portion 21 has a double structure of a guide plate 23 and a bottom plate 22 formed below the guide plate 23.
3 and the outer wall portion 21a, a gap portion 26 having a width r is formed which is opened only in the insertion direction of the bolt portion 31. Since the flat portion 34 is inserted into the gap portion 26, the flat shape is substantially equal to the shape of the flat portion 34 described above, and the width is substantially equal to the horizontal width m of the flat portion 34, as shown in FIG. The width r of the gap is equal to the flat plate portion 3.
4 is formed substantially equal to the plate thickness. A bolt insertion hole 24 is formed substantially at the center of the guide plate 23.
Reference numeral 4 communicates with a notch-shaped guide portion 25 having a constricted portion 24a and a width p. The width p of the guide portion 25 is the insertion hole 2
Since the bolt 33 is inserted with the bolt 4, the diameter of the bolt 33 is substantially equal to the diameter of the bolt 33.

Finally, referring to FIG. 1 and FIGS. 6 to 9, a fixing structure in which the bolt portion 31 is mounted on the boss portion 21 and a mounting state of the bus bar 41 will be described. First, the fixing structure of the bolt portion 31 to the boss portion 21 will be described with reference to FIG. 1. The front end of the flat plate portion 34 having the bolt 33 suspended substantially at the center is indicated by an arrow A in the gap portion 26 of the boss portion 21. The bolt 33 is inserted through the guide portion 25 and pushed along the guide portion 25 as it is. Then, when the bolt 33 is further pushed after hitting the constricted portion 24 a, the bolt 33 is positioned in the insertion hole 24 on the guide plate 23. In addition, it cannot be easily pulled out by the constricted portion 24a, so that the fixing and the positioning are performed simultaneously. Therefore, as shown in the lower part of FIG. 1, the pair of fitting portions 35 are on the outer wall surface 21 a of the boss portion 21 and the width t of the fitting portion 35 is
The vertical plate portion 36 is positioned along the outer wall surface 21a with the space therebetween.

In this state, the L-shaped bus bar 41 is fitted into the fitting portion 35. That is, the bus bar 41 is
3 is formed on the flat plate 42, and a notched recess 45 having a lateral width corresponding to the width n between the fitting portions 35 is formed on the hanging plate 44 bent vertically downward. . As shown in FIG. 6, the bus bar 41 is fixed by inserting the insertion hole 43 from above the bolt 33 and simultaneously fitting the two extending portions 44 a of the hanging plate 44 to the pair of fitting portions 35. Fixation is performed. Further, the positional relationship between the members at the above-described stage will be described with reference to FIGS. The through-hole 43 of the bus bar 41 is inserted into the bolt 33, and the extending portion 44 a of the hanging plate 44 is temporarily fixed by being sandwiched between the vertical plate portion 36 and the outer wall surface 21 a of the boss portion 21. And more busbar 4
A connection terminal 12 and a second bus bar are provided on the top of
3 and finally the nut 33a is screwed into the bolt 33 to complete the assembling operation.

When the nut is tightened, the torque generated by the tightening torque first acts on the bolt 33,
Next, it acts on both the bolt 33 and the bus bar 41. First, the rotational force applied to the bolt 33 is caused by the fact that the flat plate portion 34 of the guide member 32
, And on the other hand, the vertical plate portion 36 abuts on both side extending portions 44a of the hanging plate 44 of the bus bar 41 sandwiched therebetween, thereby suppressing the force of rotation. Further, the rotational force acting on the bus bar 41 tends to rotate because the both-side extending portions 44 a of the hanging plate 44 of the bus bar 41 are fitted into the pair of fitting portions 35 and further sandwiched between the vertical plate portions 36. Power is suppressed. In addition, by extending the length h of the vertical plate portion 36, the holding portion of the hanging plate 44 between the both side extending portions 44a becomes longer, and even if a high torque is applied, the bus bar 41 does not shift or rotate. Absent.

Further, the bolt 33 is tightened with the tightening of the nut.
Tends to move upward, but this force is suppressed by the guide plate 23 on the upper surface of the flat plate portion 34. Further, the force acting downward by tightening the nut and the force applied downward due to its own weight such as bolts are applied to the bottom plate 22. It is suppressed by. Also,
The detachment of the bolt portion 31 is prevented by the fact that the both-side extending portions 44 a of the hanging plate 44 of the bus bar 41 are fitted to the pair of fitting portions 35. Therefore, the movement of the bolt portion 31 is completely suppressed in any of the vertical and horizontal directions. In this embodiment, the case where the L-shaped bus bar is fitted is described. However, as shown in FIG. 9, the flat-shaped bus bar 46 can also be used with the electric connection bolt fixing structure of the present invention. Needless to say, there is. In this case, the vertical plate portion 36 only suppresses the rotation caused by the nut tightening described above, and the fitting portion 35 for fitting the bus bar is the boss portion 2.
1 is inserted into the gap 26. Therefore, the gap 26
The inner part has a structure that can be further inserted by the width t of the engagement part 35.

As described above, according to the fixing structure of the electric connection bolt shown in the above embodiment, the connection between the electric connection bolt 33 and the bus bar 41 or the connection terminal 12 can be performed more easily. Further, there is no need to perform any work such as forming the bolt temporarily in a state temporarily fixed by hand or positioning the bolt. Therefore, there is no danger to the worker, and the working efficiency is remarkably improved.

[0018]

As described above, according to the fixing structure of the electric connection bolt according to the present invention, the electric connection bolt can be easily fixed to the boss portion, and the connection terminal can be manually formed. Dangerous and troublesome work such as molding while holding down is not required at all, and safety and workability can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a fixing structure of an electric connection bolt according to an embodiment of the present invention.

FIG. 2 is a plan view showing a structure of a bolt portion.

FIG. 3 is a side view showing the structure of a boss.

FIG. 4 is a plan view showing the structure of a boss.

FIG. 5 is a sectional view showing a structure of a bolt portion.

FIG. 6 is a perspective view of a main part showing a bus bar fixing state.

FIG. 7 is a plan view of FIG. 6;

FIG. 8 is a sectional view of FIG. 6;

FIG. 9 is a perspective view showing a fixed state of the flat bus bar.

FIG. 10 is a perspective view of a junction box showing a conventional bolt fixing structure.

FIG. 11 is a plan view showing a conventional bolt fixing structure.

FIG. 12 is a partial sectional view of FIG.

[Explanation of symbols]

 Reference Signs List 21 boss portion 21a outer wall portion 22 bottom plate 23 guide plate 24 bolt insertion hole 24a neck portion 25 guide portion 26 gap portion 31 bolt portion 32 guide member 33 bolt 34 flat plate portion 35 fitting portion 36 vertical plate portion 41 bus bar 42 flat plate 43 through hole 44 Hanging plate 44a Extension 45 Notch recess

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-9287 (JP, A) Japanese Utility Model 4-29165 (JP, U) Japanese Utility Model 4-47274 (JP, U) Japanese Utility Model 5-5- 91122 (JP, U) Hira 4-72818 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB name) H01R 4/58 H01R 4/30 H02G 3/16

Claims (2)

(57) [Claims] 1. An electric connection bolt fixing structure in which a terminal of a power supply or output electric wire in an electric connection box and a bus bar are overlapped and fixedly connected by bolting, the flat plate portion made of a conductive material. And a vertical plate portion formed at a substantially right angle to the flat plate portion, and a bolt portion formed by vertically suspending and fixing an electric connection bolt is formed on the flat plate portion of the guide member. A guide plate having a guide portion for guiding insertion, a bolt insertion hole communicating with the guide portion and inserting the electric connection bolt, and an opening having a gap below the guide plate where the flat plate portion can be inserted. A fixing structure for an electric connection bolt, wherein a boss portion for fixing the bolt portion is formed by forming a portion. 2. The fixing structure for an electric connection bolt according to claim 1, wherein a fitting portion for fitting said bus bar is formed at a connection end of said flat plate portion with said vertical plate portion.