JPH10247450A - Wire connection structure to fusible link and wire connection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a wire side terminal to the connection terminal of a fusible link without the falling-off of the wire side terminal, and further conduct the connection simply. SOLUTION: A bolt housing room 22 which has a bolt 23 screw portion 29-passing through window and into which the bolt 23 is inserted in a rotation constraining state is provided in the wall portion 21 of a box body 15, and lock protrusions 26 for preventing the falling-off of the bolt 23 are protruding provided in the bolt housing room 22. The screw portion 29 is interposed into a wire side terminal 17, the bolt 23 is inserted into the bolt housing room 22 in this interposing state, the screw portion 29 is interposed into the connection terminal 19 of a fusible link 16, and a nut 31 is screwed so as to put into connection. The falling-off of the wire side terminal 17 is not allowed, and the connection can be easily conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and a method for connecting an electric wire to a fusible link for connecting a connection terminal of a fusible link and an electric wire side terminal of an electric wire terminal with bolts and nuts.

[0002]

2. Description of the Related Art A fusible link is a fuse for a large current, and is attached to an electric junction box mounted on an automobile in order to distribute electric power from a battery to various parts. To supply current to the fusible link, an electric wire is connected to a connection terminal of the fusible link.

FIGS. 5 and 6 show a conventional connection structure between a fusible link and an electric wire. A fusible link 1 has a main body 2 in which a fusing portion is accommodated, and a horizontal line extending from the bottom of the main body 2 to both sides. The connection terminal 3 includes a pair of extending connection terminals 3, and an insertion hole 4 through which a screw portion of a bolt is inserted is formed at a tip end of each connection terminal 3.

The fusible link 1 is mounted on a wall 6 of a box body 5 such as an electric junction box for distributing electric power from a battery. In order to perform this mounting, a pair of mounting slits 7 having a substantially U-shape and having a large-diameter insertion portion 7a in the center portion are formed in the wall portion 6 of the box body 5.
Are formed to face each other.

[0005] A nut 8 is fixed to the outer wall 6 of the opposed mounting slit 7 by being inserted.

An electric wire 9 connected to the fusible link 1
A wire-side terminal 10 composed of a screw-type terminal is attached to the terminal portion of the fusible link 1. The wire-side terminal 10 is connected to the connection terminal 3 of the fusible link 1. This connection
This is performed by the nut 8 and the bolt 12.

The wire-side terminal 10 is bent at an intermediate portion, and an insertion hole 11 through which the threaded portion 12a of the bolt 12 is inserted is formed at the bent tip portion.

In FIG. 5, reference numeral 13 denotes a bus bar which is routed on a cover of the electric junction box and forms a branch circuit for distributing electric power. The bus bar 13 comes into contact with the nut 8 inserted into the wall portion 6 and has an insertion hole at the contact portion.

Next, a connection procedure using this structure will be described. As shown in FIG. 5, the wire side terminal 10 is passed through the insertion portion 7 a of the mounting slit 7 from behind the wall portion 6 of the box body 5, and the distal end portion thereof is connected to the bus bar 1 on the nut 8.
Touch 3 Then, the fusible link 1 located above the wall portion 6 is lowered, and the connection terminal 3 is superimposed on the distal end portion of the electric wire side terminal 10.

In this state, the screw portion 12a of the bolt 12 is passed through the insertion hole 4 of the connection terminal 3, the insertion hole 11 of the electric wire side terminal 10, and the insertion hole 14 of the bus bar 13, and screwed into the nut 8 by tightening. I do. Thereby, as shown in the connection state on the left side of FIG.
In addition, since the wire-side terminal 10 is sandwiched between the nuts 8 and the bolts 12 and comes into contact, the connection terminal 3 and the wire-side terminal 10 are connected to each other via the bus bar 13.

[0011]

However, in the conventional connection structure, the fusible link 1 is located upward when the wire terminal 10 is inserted into the insertion portion 7a of the mounting slit 7 from the back side. The electric wire side terminal 10 is hidden by the fusible link 1 and is difficult to see. For this reason, it cannot be confirmed whether or not the electric wire side terminal 10 is securely in contact with the bus bar 13, and as shown in the right side of FIG. It can not be understood that it is in the state of being stuck in contact only.

When the bolt 12 is tightened as it is, the wire side terminal 10 is fixed only by being sandwiched between the bus bar 13 and the connection terminal 3 without the screw portion 12a penetrating the insertion hole 11 of the wire side terminal 10. .

Even in such a hooked state, the wire side terminal 10 is in contact with the bus bar 13 and thus passes the continuity check. However, there is a problem that the wire side terminal 10 falls off due to subsequent vibration or external force.

In addition, the wire side terminal 10 must be inserted from the back side of the wall 6 into the mounting slit 7. The insertion work is troublesome, and the rigid wire side terminal used for a thin wire has a problem. Insertion work is difficult.

Further, since the nut 8 is inserted into the wall 6, when the thread of the nut 8 is damaged or the nut 8 is aged, the entire box body 5 needs to be replaced, resulting in waste. More.

The present invention has been made in view of such conventional problems, and can securely fix the wire-side terminal, and can omit troublesome work of inserting the wire-side terminal.
Moreover, it is an object of the present invention to provide a structure and a method for connecting an electric wire to a fusible link which can eliminate the need for replacing the entire box body due to damage to the nut.

[0017]

In order to achieve the above object, an electric wire connection structure to a fusible link according to the first aspect of the present invention comprises a fusible link connection terminal attached to a wall of a box body and an electric wire terminal. In a state where the screw portion of the bolt is inserted into the wire side terminal, a connection structure sandwiched by the bolt and the nut, having a through window through which the screw portion of the bolt penetrates, and wherein the head of the bolt is in a rotation restricted state. A bolt accommodating chamber to be inserted is provided on a wall portion of the box main body, and a lock projection for preventing a bolt from falling off is protruded from an inner surface of the bolt accommodating chamber. The nut is screwed into the screw portion in this inserted state.

In this structure, the bolt is prevented from falling off by the lock projection by inserting the head of the bolt into the bolt receiving chamber of the wall. Prior to this insertion, the screw portion of the bolt is inserted into the wire-side terminal. Further, the rotation of the bolt in the bolt receiving chamber is restricted, and the screw portion penetrates the wall portion from the through window. The threaded portion penetrating the wall portion penetrates the connection terminal, and the nut is screwed in this inserted state. Therefore, since the connection is performed in a state where the screw portion of the bolt is inserted into the wire side terminal, the wire side terminal can be securely fixed without falling off.

Further, since the threaded portion of the bolt penetrates through the wall and comes off, the insertion operation is simplified. Furthermore, nuts are not inserted into the wall,
Since it is in a free state, even if it is damaged, only the nut needs to be replaced, and it is not necessary to replace the entire box body.

According to a second aspect of the present invention, there is provided the first aspect of the present invention, wherein a retaining rib with which the head of the bolt comes into contact is provided on an inner surface of the bolt accommodating chamber.

Since the retaining rib prevents the bolt from coming off, the bolt can be securely fixed in the bolt receiving chamber.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a part of a side wall of the bolt storage chamber is opened to form an insertion opening into which a head of the bolt is inserted. It is characterized by the following.

Since the insertion opening is formed in the side wall of the bolt storage chamber, the bolt can be easily inserted into the bolt storage chamber.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the inner surface of the bolt storage chamber is:
It is characterized in that the head of the bolt is shaped to fit.

Since the head of the bolt fits into the inner surface of the bolt storage chamber, the rotation of the bolt can be restricted only by inserting the bolt into the bolt storage chamber. Therefore, the rotation of the bolt can be restricted with a simple structure without providing an additional member.

A fifth aspect of the present invention is the invention according to any one of the first to fourth aspects, wherein a receiving seat surface with which the electric wire side terminal contacts is formed on a head of the bolt. I do.

Since the receiving seat surface contacts the electric wire side terminal, the head of the bolt can surely contact the electric wire side terminal,
Contact resistance is reduced.

The invention according to claim 6 is the invention according to claim 1, characterized in that a bus bar constituting a branch circuit for power distribution is sandwiched between the electric wire side terminal and the connection terminal. And

Since the bus bar is sandwiched between the electric wire side terminal and the connection terminal, the bus bar and the connection terminal are conducted, and the current from the bus bar can flow to the fusible link, and the current from the bus bar can be checked. Can be.

According to a seventh aspect of the present invention, there is provided a method for connecting an electric wire to a fusible link, wherein the screw portion of the bolt is inserted into the electric wire side terminal of the electric wire end, and the head is inserted into the bolt accommodating chamber provided on the wall of the box body. Rotationally constrained, and after inserting the bolt in a retaining state so that the screw part penetrates the wall, the connection terminal of the fusible link is superimposed on the wire side terminal, and then the nut is screwed into the screw part. The connection terminal and the electric wire side terminal are sandwiched between the bolt and the nut.

According to this method, since the head of the bolt is inserted into the bolt accommodating chamber in a state where the wire-side terminal is inserted into the screw portion of the bolt, the wire-side terminal and the bolt can be securely assembled. The terminal will not fall off. Since the connection terminal is superimposed on the wire side terminal and the nut is screwed into the screw portion, the connection terminal and the wire side terminal can be reliably conducted.

[0032]

FIG. 1 is an exploded perspective view of an embodiment of the present invention, FIG. 2 is a plan view of a box body, FIG. 3 is a plan view of a bolt, and FIG.

In this embodiment, the fusible link 16 is attached to the box body 15 and the electric wire side terminal 17 is connected to the fusible link 16.

The box main body 15 is an outer shell of an electric junction box or the like for distributing electric power from a battery to various parts of the automobile.
5 is mounted on the upper surface. As shown in FIG. 4, the fusible link 16 includes a main body 18 containing a fusing portion, and a pair of connection terminals 19 extending horizontally from the bottom surface of the main body 18. Is formed by forming an insertion hole 20.

The fusible link 16 is the box body 1
5 is fixed to the upper surface of the wall portion 21 of the box body 5.
A pair of bolt housing chambers 22 facing the connection terminals 19 are formed. A bolt 23 is inserted into each of the bolt housing chambers 22. Each of the bolt housing chambers 22 is formed to be lower than the wall 21 by pressing the wall 21.

Each bolt accommodating chamber 22 has a side wall 24
The side wall portion 24 on one side is opened by being cut out, and the opening 25 into which the bolt 23 is inserted is opened by the opening.
Is formed.

A lock projection 26 is provided on the inner surface of the side wall 24 of the bolt chamber 22 except for the insertion opening 25. The lock projection 26 is formed by bending a lower end portion of each side wall portion 24 in a hook shape toward the inside of the bolt housing chamber 22. Since the lock projection 26 is formed at the lower end of the side wall 24, the bolt 23 inserted into the bolt storage chamber 22 is supported on the lower surface by the lock projection 26. This prevents the bolt 23 from dropping out of the bolt storage chamber 22.

The bolt housing chamber 22 has an open upper surface, and a through window 28 is formed by opening the upper surface. The through-window 28 is for pulling out the screw part 29 above the wall part 21 when the screw part 29 of the bolt 23 inserted into the bolt storage chamber 22 penetrates.

Further, a retaining rib 27 is formed on the inner surface of the bolt accommodating chamber 22. The retaining rib 27 is formed at an upper portion of a corner portion where the side wall portion 24 is continuously provided, and prevents the bolt 23 inserted into the bolt accommodating chamber 22 from coming out of the through hole 28 above the wall portion 21.

As shown in FIG. 1, the bolt 23 includes a screw portion 29 and a head 30.
0a is integrally formed. The receiving seat surface 30a comes into contact with the electric wire side terminal 17, which will be described later, so that the bolt 23 and the electric wire side terminal 17 can surely come into contact with each other. In this embodiment, the head 31 is formed in a quadrangular outer shape.

The bolt 23 has its head 30 inserted into the bolt receiving chamber 22 from the insertion opening 25, and the rotation of the bolt 23 is restricted by this insertion. This rotation restriction is made by forming the inner surface of the bolt storage chamber 22 into a quadrangular shape into which the head 30 of the bolt 23 fits, so that another locking member for the rotation restriction is not required, so that the bolt storage chamber is not required. There is an advantage that the structure of 22 is simplified. By restricting the rotation of the bolt 23 in this manner, the operation of screwing the nut 31 into the screw portion 29 of the bolt 23 becomes easy.

As the electric wire side terminal 17, a screw-type terminal is used. As shown in FIG. 1, a crimping portion 34 for crimping the electric wire 32 to connect with the electric wire 32, and a conductor 33 of the electric wire 32. Is formed on the electric wire side. The wire-side terminal 17 has an intermediate portion bent at a right angle, and an insertion hole 37 is formed in the bent portion 36.

In FIG. 1, a bus bar 38 having an insertion hole 39 faces above the bolt housing chamber 22, but this bus bar 38 is not provided at the beginning of the connection, and the bus bar 38 is not connected to the bolt housing chamber 22 during the connection. It is approaching. The bus bar 38 forms a branch circuit for power distribution in the electric junction box.

Next, a connection method according to this embodiment will be described. First, as shown in FIG. 1, the screw portion 29 of the bolt 23 is inserted into the insertion hole 37 of the electric wire side terminal 17. Thereby, the electric wire side terminal 17 is securely assembled to the bolt 23,
It does not fall off the bolt 23 due to vibration or the like.

The bolt 23 assembled to the electric wire side terminal 17 is inserted into the bolt accommodating chamber 22 from the insertion port 25. Specifically, the head 30 of the bolt 23 is inserted into the bolt storage chamber 22. The bolt 2
The third head 30 is fitted in the bolt housing chamber 22 to restrict rotation, and is supported by the lock projection 26 to prevent the head from falling out.

Further, since the retaining rib 27 is in contact with the head 30, the bolt 23 does not come off upward.
Further, the insertion of the head 30 causes the screw portion 29 to move through the through-window 2.
8 and comes out above the wall 21.

Since the locking projection 26 supports the head 30 by such insertion, the bent portion 36 of the electric wire side terminal 17 is raised stepwise and is exposed above the wall 21 from the through window 28. The bent portion 36 of the wire side terminal 17 is
Since the third contact surface 30a is in contact with the receiving seat surface 30a, good conduction can be achieved.

Thereafter, as shown in FIG.
Is lowered, and the screw portion 29 is inserted through the insertion hole 39. As a result, the bus bar 38 is prevented from falling off and is overlapped on the bent portion 36 of the electric wire side terminal 17.

Further, the fusible link 16 is lowered, and the screw portion 29 is inserted into the insertion hole 20 of the connection terminal 19. By this insertion, the fusible link 16 is superimposed on the bus bar 38 in a state where the fusible link 16 is prevented from falling off.

At this time, the screw portion 29 has come out above the connection terminal 19, and the nut 31 is screwed into the screw portion 29 and tightened. In such tightening, the bolt storage chamber 2
Since the rotation of the bolt 23 is restricted by 2, only the nut 31 needs to be rotated, and the tightening can be easily performed. By screwing this nut 31,
The connection terminal 19 and the electric wire side terminal 17 are connected via a bus bar 38.

In such an embodiment, since the connection is made by inserting the bolt 23 into the bolt storage chamber 22,
Connection work becomes easy.

Further, since the electric wire side terminal 17 is attached in a state where the screw portion 29 is inserted, the electric wire side terminal 17 can be securely fixed without falling off later, and can be securely fixed. 17 can be easily mounted.

Further, since the nut 31 is in a free state separate from the box main body 15, even if the thread is damaged or deteriorated, such as breakage of the screw thread, the screw engagement with the bolt 23 is released to remove the nut. Only 31 needs to be replaced, and the entire box body 15 need not be replaced. Therefore, there is no waste.

In the present invention, the bus bar 38 may be fixed to the wall 21 of the box body 15 by welding or other means so that the bus bar 38 is located above the bolt accommodating chamber 22. Since the retaining rib is provided, the retaining rib 27 can be omitted.

[0055]

As described above, according to the structure of the first aspect of the present invention, since the connection is performed by inserting the bolt into the bolt accommodating chamber, the connection operation is facilitated. Also, since the mounting is performed in a state where the screw portion of the bolt is inserted into the electric wire side terminal, the electric wire side terminal can be securely fixed without falling off later.

Further, since the nut is free with respect to the box body, even if the thread is damaged or deteriorated, such as breakage of the screw thread, only the nut needs to be replaced, and the entire box body can be replaced. It becomes unnecessary.

According to the second aspect of the present invention, since the retaining rib prevents the bolt from coming off, the bolt can be securely fixed in the bolt receiving chamber.

According to the third aspect of the present invention, since the bolt insertion port is formed in the side wall of the bolt storage chamber, the bolt can be easily inserted into the bolt storage chamber.

According to the fourth aspect of the present invention, the rotation of the bolt can be restrained by fitting the head of the bolt to the inner surface of the bolt storage chamber, so that the structure of the rotation restraint can be simplified. it can.

According to the fifth aspect of the present invention, since the receiving seat surface contacts the electric wire side terminal, the head of the bolt can surely contact the electric wire side terminal, and the contact resistance is reduced.

According to the invention of claim 6, since the bus bar is sandwiched between the electric wire side terminal and the connection terminal, the current from the bus bar can flow through the fusible link, and the current from the bus bar can be checked. Can be.

According to the connection method of the present invention, since the head of the bolt is inserted into the bolt accommodating chamber in a state where the wire side terminal is inserted into the screw portion of the bolt, the wire side terminal and the bolt are securely assembled. And the wire side terminal does not fall off. Further, since the connection terminal is overlapped with the wire side terminal and the nut is screwed into the screw portion, the connection terminal and the wire side terminal can be reliably conducted.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a connection structure according to an embodiment of the present invention.

FIG. 2 is a partial plan view of the box body.

FIG. 3 is a plan view of a bolt.

FIG. 4 is a sectional view showing connection.

FIG. 5 is a sectional view showing a conventional connection structure.

FIG. 6 is a partial plan view of a box body used in a conventional connection structure.

FIG. 7 is a cross-sectional view of a conventional connection state.

[Explanation of symbols]

 15 Box body 16 Fusible link 17 Wire side terminal 18 Main body 19 Connection terminal 20 Insertion hole 21 Wall 22 Bolt accommodating chamber 23 Bolt 24 Side wall 25 Insertion opening 26 Lock projection 27 Retaining rib 28 Through window 29 Screw section 30 Head Part 30a Receiving seat surface 31 Nut 32 Electric wire 36 Bending part 37 Insertion hole 38 Bus bar 39 Conduction hole

Claims (7)

[Claims] 1. A connection structure in which a screw portion of a bolt is inserted between a connection terminal of a fusible link attached to a wall portion of a box body and a wire-side terminal of a wire terminal, and the bolt is screwed with a nut. A bolt receiving chamber having a through-hole through which a screw portion of the bolt penetrates and in which the head of the bolt is inserted in a rotationally constrained state is provided on a wall of the box main body, and the bolt falls into the inner surface of the bolt receiving chamber. Lock projection to prevent
A threaded portion penetrating the through window is inserted into the connection terminal and the wire side terminal, and the nut is screwed into the threaded portion in this inserted state, wherein a wire connection structure to a fusible link is provided. . 2. The electric wire to a fusible link according to claim 1, wherein a retaining rib with which the head of the bolt abuts is provided on an inner surface of the bolt receiving chamber. Connection structure. 3. The invention according to claim 1, wherein a part of a side wall of the bolt accommodating chamber is opened to form an insertion opening into which a head of the bolt is inserted. Wire connection structure to fusible link. 4. The fusible according to claim 1, wherein an inner surface of the bolt housing chamber is formed into a shape into which a head of the bolt fits. Wire connection structure to link. 5. The fusible link according to claim 1, wherein a receiving seat surface with which the electric wire side terminal contacts is formed on a head of the bolt. Wire connection structure. 6. The fusible link according to claim 1, wherein a bus bar constituting a power distribution branch circuit is sandwiched between the electric wire side terminal and the connection terminal. Wire connection structure to. 7. A screw portion of a bolt is inserted into an electric wire side terminal of an electric wire end so that a head is rotationally restrained in a bolt accommodating chamber provided in a wall portion of a box body and a screw portion penetrates the wall portion. After inserting the bolts into the fusible link, place the fusible link connection terminal on the wire side terminal, and then screw the nut onto the threaded part to sandwich the connection terminal and wire side terminal between the bolt and nut. A method for connecting electric wires to a fusible link, characterized in that: