JP2000277192A - Bolt-tightening terminal metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent diagonal insertion of a bolt during the work of tightening the bolt by means of bolt-tightening terminal metal fittings. SOLUTION: An auxiliary plate 14b formed by extending a base 12 and folding it at least doubly in a position spaced upwardly from a bolt hole 14a is formed at the locking part 14 of this terminal metal fittings 11. The auxiliary plate 14b is formed with a bolt supporting hole 14b locate coaxially with the bolt hole 14a and excessive slope of a bolt passed through the terminal metal fittings 11 is regulated by at least two points, i.e., the bolt supporting hole 14d and the bolt hole 14a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal fitting for bolting, and more particularly to preventing a bolt from being inserted obliquely during a bolting operation.

[0002]

2. Description of the Related Art FIG. 7 shows a terminal fitting 1 for bolting used for connection of a large current power supply circuit as an automobile part.
As shown in (A), a substrate 2 made of a copper plate has an electric wire connecting portion 3 for connecting an electric wire W by crimping or the like at one end and a circular fixing portion 4 having a bolt hole 4a formed at the center at the other end. have. Then, the bolt hole 4a of the fixing portion 4 is inserted into the mounting hole 5a of the mating member 5 to which the terminal fitting 1 is to be mounted.
The terminal fitting 1 is fixed to the mating member 5 by inserting the bolt B into the bolt hole 4 a via the spring washer 6 and screwing the bolt N into the nut N fixed to the mating member 5.

[0003]

However, the thickness of the terminal fitting 1 is as thin as about 0.6 to 1.2 mm, and the inclination of the bolt B cannot be restricted. For this reason, when the screwing of the bolt B is started, as shown in FIG.
Is likely to be excessively inclined, and may be forcibly screwed while being inclined. Usually, for screwing work,
Power tools that tighten with the required torque are often used, but in the above case, the bolts B and nuts N are not in the proper meshing state, and the required torque is reached when complete tightening is not possible. It is mistaken for completion of tightening. In such an incompletely tightened state, the electrical contact between the mating member 5 and the terminal fitting 1 becomes unstable, and the current supply becomes insufficient, and furthermore, it may be disconnected. was there. In addition, since a spring washer is used to prevent the bolt from being loosened after the tightening, the operation of inserting the spring washer during the bolting operation also requires time and effort.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problem, and when tightening and fixing a bolting terminal fitting to a mating member, an excessive inclination of a bolt to be inserted is prevented, and the bolt is securely inserted in a proper state. It is an object of the present invention to enable a screwing operation of a bolt.

[0005]

In order to solve the above-mentioned problems, according to the present invention, there is provided the present invention, wherein a board has an electric wire connection portion to which an electric wire is connected at one end, and a bolt hole is formed at the other end. In the terminal fitting having a fixing portion, the fixing portion is provided with an auxiliary plate extending from the substrate and bent at least twice so as to have a space above the bolt hole. A bolt, wherein a bolt support hole is formed coaxially with the bolt hole, and at least two points of the bolt support hole and the bolt hole restrict excessive inclination of a bolt to be inserted. We provide fastening terminal fittings.

According to the above configuration, when the terminal fitting is bolted and fixed, the bolt is inserted into the bolt supporting hole of the auxiliary plate and the bolt hole of the fixing portion, thereby holding the terminal metal in a supported state at two or more points having a gap. be able to. For this reason, the bolt can be held in a posture within a required inclination angle with respect to the center axis in the insertion direction, and excessive inclination can be restricted. Therefore, forcible screwing in the inclined state with respect to the mating member can be prevented, and a stable bolt tightening operation can be always performed.

A support piece projects from the inner periphery toward the center of the bolt support hole, and the tip of the support piece can be elastically contacted with a bolt inserted into the bolt support hole. Item 2). With this configuration, the support piece is always in elastic contact with the bolt inserted into the support hole of the auxiliary plate, and the function of holding the posture of the bolt can be further improved. At the same time, the bolts can be held in a temporarily fixed state by the elasticity of the support pieces with respect to the auxiliary plate. The workability of the fastening operation can be improved.

[0008] The auxiliary plate has a bent portion for elastically maintaining a space between the auxiliary plate and the substrate. Thus, after the bolting is completed, the elastic restoring force of the auxiliary plate can be applied to the bolt, so that the same bolt retaining action as the spring washer can be achieved. Therefore,
Since the spring washer can be eliminated, the workability at the time of the bolt tightening operation can be simplified.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a terminal fitting 11 for bolting.
Showing a first embodiment of the present invention, a substrate 1 made of a conductive metal plate
2 has a wire connecting portion 13 for crimping and connecting the wire W to one end of the substrate 12, and a fixing portion 14 which is fastened and fixed by a bolt B at the other end. A bolt hole 14 a for inserting the bolt B is formed at an end of the substrate 12 located at the fixing portion 14,
An auxiliary plate 14b is provided, which extends one side of the fixing portion 14 and is bent twice so as to face above the bolt hole 14a.

The auxiliary plate 14b is opposed to the substrate 12 in parallel with the substrate 12 so as to elastically have a required interval X by the bent portion 14c, and has a central portion coaxial with the bolt hole 14a of the substrate 12. Is formed. As a specific example of the terminal fitting 11, M8 ×
When using a 10 mm bolt B, the plate thickness is 1.2 m
m, the distance X between the substrate 12 and the auxiliary plate 14b is 5 mm, and the bolt holes 14a and the bolt support holes 14d are 0.2 to 0.4 mm larger than the outermost diameter of the bolt B. As a result, the insertion posture of the bolt B inserted into the bolt hole 14a and the bolt support hole 14d is regulated in a state where the bolt B is supported at two points in the vertical direction, and the bolt B is inserted obliquely with respect to the nut N of the mating member 5 with a shifted pitch. Such an excessive inclination is prevented.

Next, the step of connecting the electric wire W to the counterpart component 5 using the terminal fitting 11 having the above configuration will be described. As shown in FIG.
Bolts 14a and bolt support holes 14d
The terminal fitting 11 is positioned so as to match.
Next, the bolt B is inserted into the mounting hole 5a through the bolt support hole 14d and the bolt hole 14a, so as to match the screw hole of the nut N. In this state, the bolt B is inserted into the bolt hole 14.
a and the bolt support hole 14d are supported at two points above and below with an interval X therebetween, thereby restricting excessive inclination of the bolt B in the inserted state.

Therefore, by rotating the head of the bolt B with the power tool, the bolt B is screwed into the nut N in a regular meshing state. Then, as shown in FIG. 2B, the auxiliary plate 14b is
Are superimposed on the substrate 12 in a state of two layers against the elasticity of the bent portion 14c, and when the required torque is reached, the tightening is completed. When the tightening is completed, the auxiliary plate 14
Since the elastic restoring force b acts in the direction of pushing back the head of the bolt B to generate a strong frictional force between the two, the loosening of the bolt B is prevented similarly to the spring washer.

FIG. 3 shows a second embodiment of the terminal fitting 21 for bolting, in which the fixing portion 24 is formed in triple. In other words, the two auxiliary plates 24b and 24b 'have an interval Xa by extending the end of the substrate 22 in the length direction and forming the bent portions 24c and 24c' to be folded back in an S-shape three times. It is provided in such a manner. And each auxiliary plate 24
Bolt support holes 24d and 24d 'are formed on the b and 24b' coaxially with the bolt hole 24a. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and the description is omitted.

In order to connect to the mating component 5 using the terminal fitting 21, as in the case of the first embodiment, FIG.
The bolt B is inserted into the mounting hole 5a through the bolt support holes 24d 'and 24d and the bolt hole 24 as shown in FIG.
Then, the bolt B is held in a state where the bolt B is supported at three points by the bolt support holes 24 d ′ and 24 d and the bolt hole 24, and the terminal fitting 22 is screwed in the bolt B in this state. As shown in FIG. 4 (B), it is tightened and fixed between the nut N. In the second embodiment, since the bent portions 24c and 24c 'are present on both sides of the axis of the bolt B, the elastic restoring force on the bolt B after tightening is more strongly exerted to more effectively prevent the bolt B from loosening. Can be targeted.

FIG. 5 shows a third embodiment of the bolting terminal fitting 31, in which the inclination of the bolt B in the fixing portion 34 is more securely regulated. That is, the bolt support hole 34d of the auxiliary plate 34b bent from the bent portion 34c is set to have a diameter sufficiently larger than the outer diameter of the bolt B, and the support piece 34e is formed from a position equally divided into four inner circumferences toward the center. Is protruding.
The tip of the support piece 34e is bent into a curved surface contact portion 34f by making an R-bend, and the area surrounded by the curved surface contact portion 34f is set to be smaller than the outer diameter of the bolt B to be inserted.
At four points. In addition,
In the present embodiment, four support pieces 34e are shown, but three or five or more pieces are also possible. Note that other configurations are the same as those of the first and second embodiments, and thus the same reference numerals are given and the description is omitted.

In the terminal fitting 31, as shown in FIG. 6A, when the bolt B is inserted into the bolt support hole 34d,
The bolt B is provided at the curved contact portion 24 against the elasticity of the support piece 34e.
Since the bolt B is inserted along f and is pressed from four sides to the center, the bolt B can be securely held without rattling. At the same time, since the bolt B can be held in a temporarily fixed state, even if the screwing direction of the bolt B is a horizontal direction or an upward direction, it is possible to prevent the bolt B from falling off at the time of the bolt tightening work, and to improve the workability of the bolt tightening work. can do. Further, as shown in FIG. 6B, in the completely tightened state, the bent portion 14c and the support
The elastic restoring force of e works together to further enhance the effect of preventing the bolt B from loosening.

In each of the above-described embodiments, a type in which the electric wire W is crimped is shown as an example of the electric wire connecting portion 13 for connecting the electric wire W. However, it is also possible to employ a means for connecting the electric wire W by pressure welding. . Further, as a material of the terminal fitting, a steel plate material having a high spring property can be used.

[0018]

As is apparent from the above description, according to the terminal fitting for bolt fastening of the present invention, the bolt is arranged at a plurality of places with a required interval with respect to the fixing portion by the auxiliary plate. The posture can be held in a state where the posture is regulated so as not to be excessively inclined. Therefore, when the bolt is fixed to the mating member, it is possible to prevent the screw from being forcibly screwed in the oblique direction beforehand, and to obtain a reliable and stable contact after the tightening. Further, the loosening of the bolt can be prevented by the elastic restoring force of the auxiliary plate after the bolt is tightened, so that the number of working steps can be reduced by eliminating the use of the spring washer.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bolt fastening terminal fitting of a first embodiment.

FIGS. 2A and 2B are diagrams showing a bolt tightening step using the bolt terminal fitting according to the first embodiment.

FIG. 3 is a perspective view of a bolt terminal fitting according to a second embodiment.

FIGS. 4A and 4B are diagrams showing a bolt tightening step using the bolt-fastening terminal fitting of the second embodiment.

FIG. 5 is a perspective view of a bolt-fastening terminal according to a third embodiment.

FIGS. 6A and 6B are views showing a bolt tightening process using the bolt-fastening terminal fitting of the third embodiment.

FIGS. 7A and 7B are diagrams showing a conventional example.

[Explanation of symbols]

 W Electric wire B Bolt N Nut X, Xa Spacing 5 Counterpart member 5a Mounting hole 11, 21, 31 Terminal fitting 12 Substrate 13 Wire connecting part 14, 24, 34 Fixing part 14a, 24a Bolt hole 14b, 24b, 34b Auxiliary plate 14c, 24c, 24c ', 34c Bent portion 14d, 24d, 24d', 34d Bolt support hole 34e Support piece

Claims (3)

[Claims] 1. A terminal fitting having an electric wire connection portion to which an electric wire is connected at one end of a substrate and a fixing portion having a bolt hole formed at the other end, wherein the substrate extends to the fixing portion. An auxiliary plate is provided that is bent at least doubly so as to have an interval above the bolt hole, and the auxiliary plate has a bolt support hole that is positioned coaxially with the bolt hole. A bolt-tightening terminal fitting, wherein an excessive inclination of a bolt to be inserted is restricted by at least two points of the bolt hole. 2. A support piece protrudes from the inner periphery toward the center of the bolt support hole, and a tip of the support piece can be elastically contacted with a bolt inserted into the bolt support hole. The terminal fitting for bolting according to claim 1. 3. The bolt fitting terminal fitting according to claim 1, wherein the auxiliary plate has a bent portion for elastically maintaining a space between the auxiliary plate and the substrate.