JPH10261443A - Press-in structure of nut in terminal fixed part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent oblique fastening of a bolt. SOLUTION: A nut 2 can prevent its rotation, and is pressfitted in a recessed part 11 of a housing 1, and a terminal 4 is arranged at the front of the nut 2. A leading end of a bolt 7 passing through a through hole 4a of the terminal 4 is threaded into the nut 2 before it is fastened. Thereby, in a terminal fixed part for fixing the terminal 4 in the housing 1, the nut 2 is pressfitted in the recessed part 11 so that it can be displaced to a position closely contacted with the terminal 4 according to the fastening of the bolt 7. The nut 2 is retained in the bottom side of the recessed part 11 before the bolt 7 is fastened, thereby ensuring a predetermined spacing between the nut 2 and the terminal 4 arranged at the front of the nut 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for press-fitting a nut in a terminal fixing portion for fixing a terminal to a housing.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional fusible link box. This fusible link box has a housing 1 made of resin, and has a terminal fixing portion 10 on a side surface of the housing 1. The nut 2 is press-fitted and fixed to the terminal fixing portion 10. When the fusible link 3 is inserted into the housing 1, the terminal 4 of the fusible link 3
Is located in front of the

FIG. 6A shows a press-fitting structure of the nut 2. The nut 2 has a square bottom flange 2 a, and a side edge of the bottom flange 2 a is pressed into a groove 1 a provided in the housing 1 as a recess, thereby forming the housing 1.
It is fixed in a state where it is not stopped. In this case, the groove 1a is set to a size such that the nut 2 does not rattle.

[0004] As shown in FIG.
Together with the terminal 4 of the wire W and the LA terminal 5
When fixing the LA terminal 5 on the terminal 4 of the fusible link 3 previously positioned on the front surface of the nut 2, the through-holes 4a of the terminals 4, 5
Pass the tip of the bolt 7 through 5a. Then, after the tip of the bolt 7 is manually tightened to the nut 2 to the extent shown in FIG. 6A, the bolt 7 is completely tightened to the nut 2 using a tool such as an air wrench. Thus, the terminals 4 and 5 are fixed to the housing 1 by the bolts 7 and the nuts 2.

[0005]

However, conventionally, as shown in FIG. 6 (b), the interval between the nut 2 and the terminals 4, 5 is set narrow so that the nut 2 comes into close contact with the terminal 4 at the time of final tightening. Therefore, when the tip of the bolt 7 is manually tightened to the nut 2 while using the through holes 4a and 5a of the terminals 4 and 5 as a guide, the play angle A of the bolt 7 regulated by the periphery of the through holes 4a and 5a. Becomes large. Therefore, bolt 7
Was obliquely tightened.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a nut press-fitting structure in a terminal fixing portion which can prevent diagonal tightening of bolts and reliably ensure normal fastening strength. And

[0007]

According to a first aspect of the present invention, a nut is press-fitted into a recess of a housing so as to prevent rotation, a terminal is arranged on a front surface of the nut, and a tip of a bolt is passed through a through hole of the terminal. In a terminal fixing portion for fixing the terminal to the housing by screwing and tightening the tip of the bolt to the nut, the nut is press-fitted into the recess so that the nut can be moved to a position where the nut is in close contact with the terminal in accordance with the tightening of the bolt. The nut is held on the bottom side of the concave portion before tightening the bolt, so that a predetermined interval is secured between the nut and a terminal arranged on the front surface thereof.

[0008] In this structure, the distance between the nut and the terminal is relatively large before the bolt is tightened. Therefore, when the tip of the bolt passed through the through hole of the terminal is manually tightened to the nut, The range of the play angle of the bolt regulated by the peripheral edge of the through hole is narrowed, and the bolt is prevented from being obliquely tightened. Then, when the bolt is further tightened, the nut moves accordingly to the terminal side, and finally comes into close contact with the terminal, so that the terminal can be securely fastened to the housing by the bolt and the nut.

According to a second aspect of the present invention, there is provided a press-fitting structure for a nut in the terminal fixing portion according to the first aspect, wherein a protrusion for preventing the nut from being pulled forward is provided at a front end of the concave portion.

With this structure, the nut does not come off accidentally.

According to a third aspect of the present invention, there is provided a structure for press-fitting a nut in the terminal fixing portion according to the first or second aspect, wherein a force for holding the nut is generated in the inner wall of the recess in accordance with the press-fit of the nut. The rib is provided along the moving direction of the nut.

In this structure, the nut can be securely held at a position away from the terminal by the rib before the bolt is tightened. At the time of the final tightening, the nut is easily moved to the terminal side by sliding on the rib. Can be moved.

According to a fourth aspect of the present invention, there is provided a structure for press-fitting a nut in the terminal fixing portion according to any one of the first to third aspects, wherein the terminal is provided with a nut when the terminal is arranged on the front surface of the nut. It is characterized in that a projection for widening the gap is provided.

In this structure, by providing the protrusion on the terminal side, the gap between the nut and the terminal before tightening can be widened, so that the play angle of the bolt can be further reduced. Further, even when there is no dimensional margin on the concave side of the housing, the gap between the nut and the terminal can be widened, and the play angle of the bolt can be reduced.

[0015]

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

Since the entire configuration of the fusible link box to which the present invention is applied is the same as that of FIG. 5, only the main parts will be described. FIG. 1 is an enlarged view showing a terminal fixing portion.
5 and 6 are denoted by the same reference numerals.

In this terminal fixing portion, a margin in the depth direction is secured in the concave portion 11 into which the nut 2 is press-fitted. The nut 2 is press-fitted into the concave portion 11 so as to be able to move to a position where the nut 2 is in close contact with the terminal 4 in accordance with the tightening of the bolt 7. In particular, in this case, by holding the nut 2 at the bottom of the recess 11 before tightening the bolt, a predetermined large space S2 is secured between the nut 2 and the fusible link terminal 4 disposed on the front surface thereof. doing. Here, the nut 2 is held at a fixed position by pressing both ends in the width direction of the bottom flange 2a and the inner wall 11a of the concave portion 11 into pressure. Further, a retaining projection 12 is provided at the front end of the concave portion 11, and the retaining projection 12 allows the nut 2
Is locked forward.

Next, the operation will be described.

In this structure, before the bolt is tightened, the gap S2 between the nut 2 and the terminal 4 is relatively large, so that the bolts 7 passed through the through holes 4a and 5a of the terminals 4 and 5 are provided.
When manually tightening the tip of the
a, the range of the play angle B of the bolt 7 regulated by the peripheral edges of 5a can be narrowed. Therefore, as shown in FIG. 2A, the bolt 7 can be tightened straight without manually tightening the bolt 7 at the time of manual tightening.

When the bolt 7 is further tightened from this state, as shown in FIG. 2B, the nut 2 moves toward the terminal 4 according to the tightening operation, and finally comes into close contact with the terminal 4. . Therefore, the terminal 4 can be securely fastened to the housing 1 by the bolt 7 and the nut 2. At the time of final tightening, the nut 2 moves to the terminal 4 side as shown in the figure,
By visually checking the position of the nut 2, the bolt 7
You can also find that you forgot to close.

As shown in the embodiment of FIG.
If several ribs 22 for generating a force for holding the nut 2 in accordance with the press-fitting of the nut 2 are provided in parallel on the inner wall 21 a along the moving direction of the nut 2, Since the contact portion of the wall 21a can be limited,
Press-fitting of the nut 2 becomes easier. At the same time, since the contact portion becomes clear, the nut 2 can be securely held at the point before the tightening regardless of a manufacturing error or the like. Therefore, a predetermined gap S2 can be reliably ensured between the nut 2 and the terminal 4 at the time of manual tightening.

In addition, since the contact portion is limited, when the nut 2 moves on the rib 22, the movement is smooth, and the workability at the time of final tightening with an air wrench or the like is improved. The effect is also obtained.

As shown in the embodiment of FIG.
By providing a protrusion 24a on the side that abuts on the step 23 on the housing 1 side, it is also possible to ensure the interval S2 between the terminal 24 and the nut 2. In such a case, by increasing the interval S2, the play angle of the bolt when further tightening by hand can be narrowed, and oblique tightening can be prevented. Further, in this example, since the protrusion 24a is provided on the terminal 24 side, even when there is no dimensional margin on the concave portion 21 side of the housing 1, the interval S2 between the nut 2 and the terminal 24 can be widened. it can.

[0024]

As described above, according to the first aspect of the present invention, a large gap is secured between the terminal and the nut during manual tightening, and the nut is in close contact with the terminal during final tightening. In addition, oblique tightening during manual tightening can be prevented, and the terminal can be securely fixed to the housing with bolts and nuts by full tightening. In addition, at the time of final tightening, the nut moves to the terminal side, so that by visually checking the position of the nut, it is possible to discover that the bolt has been forgotten to be tightened.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, an effect of preventing the nut from falling off can be obtained.

According to the third aspect of the present invention, the following effect is obtained in addition to the effects of the first or second aspect of the invention. That is, since the rib is provided on the inner side surface of the concave portion, the contact portion between the nut and the concave portion is limited, and the nut can be easily press-fitted.
Further, since the contact portion is clear, the nut can be securely held regardless of a manufacturing error or the like. In addition, since the contact portion is limited, when the nut moves on the rib, the movement is smooth, and the workability at the time of final tightening with an air wrench or the like is improved.

According to the fourth aspect of the invention, the following effect is obtained in addition to the effect of any one of the first to third aspects of the invention. That is, even when there is no dimensional margin on the concave side of the housing, the play angle of the bolt can be surely narrowed, thereby solving the problem of oblique tightening in manual tightening.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of an embodiment of the present invention.

FIGS. 2A and 2B are explanatory views of an operation of the embodiment of the present invention, in which FIG. 2A is a cross-sectional view showing a state when hand-tightened, and FIG. 2B is a cross-sectional view showing a completely tightened state.

FIG. 3 is a configuration diagram of a main part of another embodiment of the present invention;
(A) is a perspective view showing a state where a nut is about to be press-fitted into a recess formed in a housing, and (b) is a plan view after press-fitting.

FIG. 4 is a sectional view showing a configuration of a main part of still another embodiment of the present invention.

FIG. 5 is a perspective view showing a terminal fixing portion of a conventional fusible link box.

6A and 6B show a nut press-fitting structure in a conventional fusible link terminal fixing portion, in which FIG. 6A is a cross-sectional view showing a state where regular hand-tightening is performed, and FIG. FIG.

[Explanation of symbols]

 Reference Signs List 1 housing 2 nut 4, 24 terminal 4a through hole 7 bolt 11 concave portion 12 retaining protrusion 21 concave portion 21a inner wall surface 22 rib 24 terminal 24a protrusion

Claims (4)

[Claims] 1. A nut is press-fitted into a recess of a housing so as not to rotate, a terminal is arranged on the front surface of the nut, a tip of a bolt is passed through a through hole of the terminal, and a tip of the bolt is screwed into the nut. In a terminal fixing portion for fixing the terminal to the housing by tightening, the nut is press-fitted into the recess so as to be able to move to a position in which the nut is in close contact with the terminal in accordance with the tightening of the bolt, and the nut is tightened before tightening the bolt. A press-fitting structure for a nut in a terminal fixing portion, wherein a predetermined interval is secured between the nut and a terminal arranged on the front surface thereof by holding the nut on the bottom side of the concave portion. 2. The press-fitting structure for a nut in a terminal fixing part according to claim 1, wherein a retaining projection is provided at a front end of the concave part in a forward direction of the nut. Construction. 3. The press-fitting structure for a nut in a terminal fixing portion according to claim 1, wherein a rib for generating a force for holding the nut in accordance with the press-fitting of the nut is provided on an inner wall of the recess. A press-fitting structure of a nut in a terminal fixing portion, which is provided along a moving direction. 4. The press-fitting structure of a nut in a terminal fixing part according to claim 1, wherein the terminal has a projection that widens a gap with the nut when the terminal is arranged on a front surface of the nut. The press-fitting structure of the nut in the terminal fixing portion, characterized in that: