JPH11213855A - Fusible link fitting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fusible link fitting method, capable of improving the detecting ability of the oblique fastening of a bolt before processing for connecting a fusible link to a terminal and capable of improving the dimensional accuracy at a position in the temporary fastening condition of the bolt at a low cost. SOLUTION: A bolt 6 is temporarily fastened to a nut 5 fitted to a fusible link housing 2, and thereafter, a terminal 9 is slid for insertion in a direction crossing the bolt fastening direction, so as to position a connecting part 9b of the terminal 9 between a head 6a of the bolt 6 and a leg 4a of a fusible link 4, and the bolt 6 is fastened so as to connect the leg 4a of the fusible link 4 to the connecting part 9b of the terminal 9. In this case, before processing to another process, after the bolt 6 is fastened to the nut 5 once, the bolt 6 is loosened again to transit to the temporary fastening condition, and thereafter, a separate process is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a method of attaching a screw-type fusible link requiring high current characteristics.

[0002]

2. Description of the Related Art For example, one of the present applicants has filed an application in Japanese Patent Application No. 9-120932 for a fusible link box capable of performing a bolt tightening operation from above and below a fusible link housing. This is shown in FIG.
7, a fusible link box 1 includes a fusible link housing 2 made of synthetic resin. The fusible link housing 2 has a box-shaped front portion 2a in which the main body side of the fusible link 4 is housed and mounted, and a cross section in which a pair of legs (tab terminals) 4a, 4a of the fusible link 4 are inserted and arranged. And an H-shaped partition 2b. In the upper and lower concave portions of the partition 2b, nuts 5 each having a rectangular plate-like lower side and a cylindrical upper side are fitted.

The front part 2 of the fusible link housing 2
A pair of openings 2d, 2d communicating with the respective recesses of the partition 2b are formed at the center of the side wall 2c of FIG.
d, each leg 4a of the fusible link 4 is a partition 2b.
It protrudes to the side. 4 and 5
As shown in (a) and (b), bolts 6 for connecting each leg 4a of the fusible link 4 to a terminal 9 to which the electric wire 7 is crimped are connected to the nut 5 in advance (parts of the fusible link box 1). Temporarily tightened (in a single item). further,
The terminal 9 has a U-shaped bridge portion 9a which is vertically erected so as to have a space passing through the head portion 6a of the bolt 6 in a temporarily tightened state.
And a U connected to each leg 4a of the fusible link 4
It has a connection part 9b in the shape of a letter board and a crimping part 9c to which the electric wire 7 is crimped. As shown in FIG. 4, a round hole 4b through which the shank 6b of the bolt 6 passes is formed at the center of each leg 4a of the fusible link 4.

According to the fusible link box 1 of the prior art, as shown in FIG. 4, the fusible link 4 is set on the front portion 2a of the fusible link housing 2 before the bolts are temporarily tightened in a single component state. After the setting, the bolts 6 are previously removed by hand or by an automatic screwing machine (not shown).
b) Temporarily tighten the nuts 5 arranged in the respective recesses.
Then, as shown in FIG. 7B, when the bolt 6 is obliquely tightened, the normal screwing state of the bolt 6 shown in FIG. 7A at the time of temporary tightening and the bolt shown in FIG. Since the amount of change X in the position of the bolt 6 is generated in the diagonally tightened state of 6, the presence or absence of the diagonally tightened state of the bolt 6 can be confirmed by detecting the amount of change X with a detector (not shown) or the like.

[0005] In the wire harness manufacturing process, only the fusible link housing 2 in which the bolts 6 are temporarily tightened in a regular screwed state is used, and FIG.
As shown in (b), the head 6a of the bolt 6 temporarily tightened
Fusible link housing 2 in the direction orthogonal to the direction of bolt tightening, with terminal 9 having bridge portion 9a passing through
Of the bolt 6 by sliding it onto the partition 2b
a and the connecting portion 9b of the terminal 9 is located between the terminal 4a and the leg 4a of the fusible link 4. Then, the bolt 6 is fully tightened with an impact wrench (not shown) or the like, and the leg 4a of the fusible link 4 is connected to the terminal. 9 and the connection portion 9b. The bolt 6 which is the last attachment process of the fusible link 4
FIG. 6 shows the final state after the final tightening.

[0006]

In the prior art method of mounting the fusible link 4, prior to the wire harness manufacturing process, bolts are attached to the nuts 5 arranged in the respective recesses of the partition 2b of the fusible link housing 2. 6 is temporarily tightened in advance, and as shown in FIG.
When diagonal tightening occurs, the bolt 6 shown in FIG.
7B, the amount of change X in the position of the bolt 6 caused by the regular screwing state at the time of the temporary tightening and the obliquely tightening state of the bolt 6 shown in FIG.
Is detected by a detector or the like to check whether or not the bolt 6 is obliquely tightened. However, since the amount of change X in the position of the bolt 6 is very small, it is difficult to confirm the oblique tightening of the bolt 6, High-precision and high-priced detectors are essential.

In addition, when the bolts 6 are temporarily tightened to the nuts 5 arranged in the fusible link housing 2, the bolts 6 are initially manually tightened.
It is difficult to manage the position (bolt height H) of the regular screwing state at the time of temporary tightening of the bolt 6 shown in FIG. A jig for detecting the length is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to improve the detection force of diagonal tightening of a bolt before connecting a fusible link to a terminal and the position of the bolt in a temporarily tightened state. It is an object of the present invention to provide a method of attaching a fusible link that can improve the dimensional accuracy of a fusible link at low cost.

[0009]

According to the first aspect of the present invention, when a fusible link is mounted on a fusible link housing and the legs of the fusible link are connected to the terminals of the electric wires by bolts, The bolt is temporarily tightened in advance to a nut attached to the fusible link housing, and then, in a separate step, the terminal is slid and inserted in a direction orthogonal to the bolt tightening direction to thereby secure the head of the bolt and the fusible link. A method of mounting a fusible link in which the connection portion of the terminal is located between the leg portion and the bolt, and then the bolt is fully tightened to connect the leg portion of the fusible link and the connection portion of the terminal. Before entering the separate step, after the bolt is once fully tightened to the nut attached to the fusible link housing Back to the temporarily fastened state is loosened again the bolt, characterized in that by then tightened again the bolt in a separate step connecting the connection portion of the terminal and the leg portion of the fusible link.

In this method of mounting a fusible link,
Before the step of connecting the leg portion of the fusible link and the connection portion of the terminal of the electric wire by fully tightening the bolt to the nut, after the bolt is fully tightened to the nut attached to the fusible link housing, the bolt is re-tightened. By loosening and returning to the temporarily tightened state, oblique tightening of the bolt can be easily detected by comparison with the fully tightened state of the bolt. As a result, the oblique tightening of the bolt is easily and reliably prevented, and the leg of the fusible link and the connecting portion of the terminal are always accurately and reliably connected in a favorable state.

According to a second aspect of the present invention, there is provided the method of attaching a fusible link according to the first aspect, wherein the shank portion is provided with identification means which is peeled off when returning from the final tightening state before the separate step to the temporary tightening state. It is characterized by using bolts that have been set.

In this method of mounting a fusible link,
Completion of the temporary fastening operation of the bolt can be easily detected by peeling off the identification means.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A is an explanatory view showing a state of a bolt used for connecting a fusible link and a terminal of a fusible link box according to an embodiment of the present invention before a nut is fully tightened, and FIG. FIG. 1 (c) is an explanatory view of the bolt in the process of being fully tightened, FIG. 1 (c) is an explanatory view showing a fully tightened state of the bolt in a regular screwed state, and FIG. FIG. 1E is a perspective view of the fusible link box in a temporarily tightened state of the bolt, showing the state in which the bolt has been returned to the tightened state. Since the fusible link box 1 has the same configuration as the prior art, the same reference numerals are given and the detailed description is omitted.

The method of mounting the fusible link 4 applied to the fusible link box 1 is the same as that of the prior art described above, except that the fusible link 4 is attached to the nut 5 disposed in each recess of the partition 2b of the fusible link housing 2. The bolt 6 is temporarily tightened in advance, and then, in a wire harness manufacturing process (another process), the terminal 9 having the bridge portion 9a passing through the head portion 6a of the temporarily tightened bolt 6 is slid in a direction orthogonal to the bolt tightening direction. The connecting portion 9b of the terminal 9 is located between the head 6a of the bolt 6 and the leg 4a of the fusible link 4, and then the bolt 6 is fully tightened by an impact wrench (not shown). The leg portion 4a of the fusible link 4 and the connecting portion 9b of the terminal 9 are connected to each other, but before the wire harness manufacturing process is started, FIGS. As shown in FIG. 1C, after the bolt 6 is once fully tightened to the nut 5 arranged in the fusible link housing 2, the bolt 6 is loosened again as shown in FIG. Return to the state (bolt 6
After the detection is performed in the final tightening state to detect the oblique tightening, the bolts 6 are fully tightened again in the wire harness manufacturing process by returning the specified number of times to the temporary tightening state. It differs from the prior art in that the leg 4a and the connection 9b of the terminal 9 are connected.

That is, before starting the wire harness manufacturing process, the bolt 6 which is properly inserted and screwed into the female screw portion 5a of the nut 5 arranged in the fusible link housing 2 is shown in FIG. As shown in FIG. 2, it is fully tightened and fixed to the nut 5, but as shown in FIG.
When the oblique tightening occurs, the bolt 6 is fixed in the middle of the female screw portion 5a of the nut 5. In the case of the diagonal tightening of the bolt 6, the amount of change X from the bolt insertion start position,
As shown in FIG. 1 (c), there is a large difference from the change amount Y from the bolt insertion start position in the case of the regular full tightening of the bolt 6, and the detection of the oblique tightening of the bolt 6 can be detected by an inexpensive detector. This is easily possible (the same can be said for the number of rotations of the bolt 6 from the start of bolt insertion).

Further, as shown in FIG. 1 (d), when the bolt 6 is temporarily screwed into the regular threaded position H, the bolt 6 is
By making use of the fact that how much the head 6a of the bolt 6 is raised with respect to the nut 5 by loosening the rotation is designed and determined, the bolt 6 shown in FIG. From the fixed state, as shown in FIG. 1D, by controlling the number of rotations of the bolt 6 to be loosened, the size can be set with high accuracy.

As described above, according to the method of mounting the fusible link 4, before the wire harness manufacturing process, the bolt 6 is attached to the nut 5 arranged in the fusible link housing 2.
After the bolts 6 are fully tightened, the bolts 6 are loosened again to return to the temporarily tightened state, so that the amount of change Y in the fully tightened position of the bolt 6 and the amount of change X in the obliquely tightened position of the bolt 6 in the normal screwed state. And the bolt 6 is larger than the prior art method.
Can be easily and accurately detected by an inexpensive detector or the like. In other words, the bolt assembly that is most likely to cause the bolt 6 to be diagonally tightened is performed not in the wire harness manufacturing process but in the state of a single component, and when diagonal tightening of the bolt 6 is detected, the detection becomes extremely easy. Diagonal tightening of the bolt 6 can be reliably prevented at low cost. Further, since it is not necessary to assemble bolts in the wire harness manufacturing process, the efficiency of assembling work is improved. Furthermore, since the diagonal tightening of the bolt 6 is prevented,
Connecting portion 9b between leg 4a of fusible link 4 and terminal 9
Are always connected in good condition accurately and reliably.

FIG. 3 shows another embodiment of the bolt, and FIG.
FIG. 3A is an explanatory view showing a state in which a paint as an identification means is applied to a shank portion of the bolt, and FIG. 3B is an explanatory view showing a temporarily tightened state by the bolt.

The bolt 6 'has a predetermined color paint 10 applied to the shank 6b as identification means. When the bolt 6 'is used, as shown in FIG. 3B, the paint 10 is peeled off when the bolt 6' is returned from the fully tightened state to the temporarily tightened state before the wire harness manufacturing process, and the bolt 6 'is temporarily removed. The tightening state is easily detected. That is, the completion of the temporary tightening operation of the bolt 6 'can be easily confirmed by peeling off the paint 10 applied to the shank 6b of the bolt 6'.
Also, in the case where the bolt 6 'is fully tightened and the temporary return work is performed, when the diagonal tightening occurs during the final tightening of the bolt 6', the bolt 6 'is disengaged in the work of the temporary return tightening, and the slant due to the impossible return work. Tightening can also be detected.

According to each of the above embodiments, the method of mounting a screw-type fusible link requiring high current characteristics has been described. However, the method of mounting a fusible link (fuse) having low current characteristics, etc., has been described. May be applied. Also,
Of course, the identification means applied to the shank portion of the bolt is not limited to paint.

[0022]

As described above, according to the first aspect of the present invention, before the step of connecting the leg of the fusible link and the connection part of the terminal of the electric wire by the final tightening of the bolt with respect to the nut, the fusible link is required. After the bolt is fully tightened to the nut attached to the bull link housing, the bolt is loosened again and returned to the temporarily tightened state, so that the final tightening position of the bolt and the obliquely tightened position of the bolt, which are in a normal screwed state, can be adjusted. The difference is greater and diagonal tightening of the bolt can be detected more simply and at lower cost than in prior art methods. Thereby, the diagonal tightening of the bolt can be easily and reliably prevented, and the leg portion of the fusible link and the connecting portion of the terminal can always be connected accurately and reliably in a good state.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the completion of the temporary fastening operation of the bolt can be easily detected by peeling off the identification means provided on the shank portion of the bolt. it can.

[Brief description of the drawings]

FIG. 1 (a) is an explanatory view showing a state before a nut of a bolt used for connecting a fusible link and a terminal of a fusible link box according to an embodiment of the present invention before final tightening;
(B) is an explanatory view of the bolt in the process of being fully tightened, (c) is an explanatory view showing a fully tightened state of the bolt in a regular screwed state, and (d) is a state in which the bolt is loosened from the fully tightened state. FIG. 4E is an explanatory view showing a state in which the bolt is returned to a temporarily tightened state, and FIG. 7E is a perspective view of the fusible link box in a temporarily tightened state of the bolt.

FIG. 2 is an explanatory view showing an obliquely tightened state of the bolt.

FIG. 3A is an explanatory view showing a state in which a paint as an identification means is applied to a shank portion of a bolt, and FIG. 3B is an explanatory view showing a temporarily tightened state by the bolt.

FIG. 4 is an exploded perspective view showing a state before connection of a fusible link and a terminal of a fusible link box of the prior art.

FIG. 5A is an explanatory view showing a state in which the prior art terminal is being slid, and FIG. 5B is an explanatory view showing a state in which the terminal is slid.

FIG. 6 is a perspective view showing a state in which the connection between the fusible link and the terminal of the prior art is completed.

FIG. 7A is an explanatory view showing a regular screwing state of a bolt used for connecting the fusible link and the terminal of the prior art at the time of temporary tightening, and FIG. 7B is an explanatory view showing an obliquely tightened state of the bolt. FIG.

[Explanation of symbols]

 2 fusible link housing 4 fusible link 4a leg 5 nut 6, 6 'bolt 6a head 6b shank 7 wire 9 terminal 9a bridge 9b connection 10 paint (identification means)

Claims (2)

[Claims] When a fusible link is mounted on a fusible link housing and a leg of the fusible link is connected to a terminal of an electric wire by bolts, the nut is attached to the fusible link housing. The bolt is temporarily tightened in advance, and then, in a separate step, the terminal is slid and inserted in a direction orthogonal to the bolt tightening direction to connect the terminal of the terminal between the head of the bolt and the leg of the fusible link. And then tightening the bolts to connect the leg portion of the fusible link and the connection portion of the terminal, the fusible link mounting method, before entering the separate step After the bolt is once fully tightened to the nut attached to the fusible link housing, the bolt is loosened again to temporarily tighten the bolt. Back to state, the mounting method then fusible link, characterized in that by the tightening the bolt again connecting the connection portion of the terminal and the leg portion of the fusible link in a separate step. 2. The method for attaching a fusible link according to claim 1, wherein a bolt having a shank portion provided with an identification means that is peeled off when returning from the final tightening state before the separate step to the temporary tightening state is used. A method for mounting a fusible link characterized by the following.