JPH08185916A - Terminal connecting structure for bus bar - Google Patents

Abstract

PURPOSE: To reduce contact resistance and restrain heat generation by forming a slope on a slit, so as to keep a female terminal in plane-to-plane contact with both sides of a male terminal. CONSTITUTION: The slit 6b of the female terminal 6a of the second bus bar 6 is formed, so as to keep the forward end of the male terminal 4a of the first bus bar 4 in planar contact with both sides 6c thereof in an insertion direction A. Also, expansion sections 6e are formed to enable a base end to elastically open and close the slit 6b, and spring support points (a) are provided at the bottom. Before the insertion of the terminal 4a, contact end sections 6d form slopes 6f for increasing slit width toward the base end. In this case, the inclination angle θ of the slopes 6f is different, depending on plate thickness, the positions of the points (a), the length of the slopes 6f or the like. In this structure, the slopes 6f are set to be in parallel to each other and the contact end sections 6d are set to come in plane-to-plane contact with both sides 4b of the terminal 4a, when the terminal 4a is inserted and the slit 6b is opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal connecting structure for a bus bar, and more particularly, to increasing a contact area when a male terminal of a bus bar is inserted into a slit of a female terminal for connection.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, for example, a male terminal 1a formed by bending an end portion of a first bus bar 1 of a relay box for an automobile downward is connected to a second bus bar 2 of a junction box. A terminal connection structure of a bus bar has been put into practical use, which is inserted into and connected to a slit 2b of a female terminal 2a formed by bending an end of the female terminal upward, from a direction orthogonal to the female terminal 2a.

In both side pieces 2c, 2c of the slit 2b of the female terminal 2a of the second bus bar 2, the front end portion in the insertion direction A of the male terminal 1a of the first bus bar 1 has both side surfaces 1 of the male terminal 1a.
b, 1b are formed on the contact edges 2d, 2d, and the base is formed on the enlarged portions 2e, 2e so as to elastically open and close the slit 2b. The bottoms of the enlarged portions 2e, 2e are springs. It is a fulcrum a, a.

[0004]

However, the contact edges 2d, 2d of the two side pieces 2c, 2c of the female terminal 2a are not provided.
Before the male terminal 1a is inserted, the slit width W1 is provided over the entire length between the tip side and the base side in the inserting direction A of the male terminal 1a.
Is constant, the male terminal 1a is inserted and the slit 2b
When the two are opened, the contact edges 2d of the two side pieces 2c, 2c,
2d is inclined so that the slit width gradually decreases (W2> W3) from the front end side to the rear end side in the insertion direction A.

As a result, both side pieces 2 of the female terminal 2a are
The contact edge portions 2d and 2d of c and 2c come into point contact with both side surfaces 1b and 1b of the male terminal 1a (see b and b in FIG. 5B), and the contact area is reduced to reduce the contact resistance. There is a problem that the temperature becomes high and heat is easily generated.

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a bus bar terminal connection structure capable of increasing a contact area when a male terminal of a bus bar is inserted into a slit of a female terminal for connection. It is intended.

[0007]

In order to achieve the above object, the present invention is formed by bending a male terminal formed by bending the end portion of a first bus bar to an end portion of a second bus bar. In the terminal connecting structure of the bus bar, which is inserted into the slit of the female terminal from a direction orthogonal to the female terminal for connection, both side portions of the slit of the female terminal of the second bus bar are on both sides of the male terminal. In addition to being formed on the contact edge portion that contacts the surface, an enlarged portion that elastically opens and closes the slit is formed on the base side of the slit, and the contact edge portions of the both side piece portions are the male terminals. When the slit is opened at the time of insertion of the male terminal, the slit width is gradually increased from the distal end side in the insertion direction toward the base side so as to come into contact with both side surfaces of the male terminal face-to-face. Bus bar terminal connection structure It has to offer.

[0008]

According to the present invention, the contact edge portions of both side portions of the female terminal of the second bus bar are set to the positions before the male terminal of the first bus bar is inserted.
When the slit is formed on the inclined surface where the slit gradually increases from the tip side to the base side in the insertion direction, and when the male terminal is inserted and the slit is opened, the inclined surface becomes parallel and the contact edges are on both sides of the male terminal. It comes into contact with the faces face-to-face. By this surface contact, the contact area is increased and the contact resistance is lowered, so that heat generation can be suppressed.

[0009]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. As shown in FIGS. 3 (A) and 4, the first bus bar 4 housed in the relay box 3 has male terminals 4a, ..., 4a formed by bending the ends of the first bus bar 4 downward.
, And each of the male terminals 4a is covered with a cover portion 3a, ..., 3a of the relay box 3 having an open bottom surface.

On both sides of each cover portion 3a of the relay box 3, concave rail-shaped lock portions 3b, 3b are provided, respectively.

As shown in FIGS. 3B and 4, the second bus bar 6 housed in the junction box 5 includes:
Female terminal 6 in which the end portion of the second bus bar 6 is bent upward
, 6a are formed, and each of the female terminals 6a has a cover portion 5a, ..., Of the junction box 5 having an open top surface.
5a, respectively.

On both sides of each cover portion 5a of the junction box 5, the lock portion 3 of the relay box 3 is provided.
convex rail-shaped lock portion 5 with which b and 3b are engaged from above
b and 5b are provided.

As shown in FIG. 2A, in the male terminal 4a of the first bus bar 4 of the relay box 3, the lock portions 3b, 3b of the relay box 3 are moved upward to the lock portions 5b, 5b of the junction box 5. 2 (B), the slit 6b of the female terminal 6a of the second bus bar 6 of the junction box 5 is engaged when locked.
Then, it is inserted from the direction orthogonal to the female terminal 6a.

As shown in detail in FIG. 1A, both side portions 6c, 6 of the slit 6b of the female terminal 6a of the second bus bar 6 are formed.
c is formed at the contact edges 6d and 6d where the front end portion of the male terminal 4a of the first bus bar 4 in the insertion direction A contacts both side surfaces 4b and 4b of the male terminal 4a, and the base portion elastically forms the slit 6b. It is formed on the enlarged portions 6e, 6e that can be opened and closed, and the bottom portions of the enlarged portions 6e, 6e serve as spring fulcrums a, a.

The contact edge portions 6d of the both side piece portions 6c, 6c,
Before insertion of the male terminal 4a, 6d is formed on the inclined surfaces 6f and 6f in which the slit width gradually increases from the tip side in the insertion direction A of the male terminal 4a toward the base side (W4 <W5). Inclination angle θ of the inclined surfaces 6f, 6f of the contact edge portions 6d, 6d
Varies depending on the plate thickness of the male terminal 4a, the positions of the spring fulcrums a, a, the lengths of the inclined surfaces 6f, 6f, etc., but as shown in FIG. 1B, the slit 6b is formed when the male terminal 4a is inserted. When opened, the inclined surfaces 6f, 6f become parallel to each other, and the contact edges 6d, 6d are set so as to make face-to-face contact with both side surfaces 4b, 4b of the male terminal 4a.

With the above configuration, the relay box 3 is provided.
When the lock portions 3b, 3b of the junction box 5 are locked by being engaged with the lock portions 5b, 5b of the junction box 5 from above (state of FIG. 4), the male terminal 4a of the first bus bar 4 of the relay box 3 becomes The second bus bar 6 is inserted into the slit 6b of the female terminal 6a from above.

The contact edges 6d, 6d of the female terminal 6a of the second bus bar 6 before the insertion of the male terminal 4a have inclined surfaces 6 in which the slit width gradually increases from the tip side in the insertion direction A toward the base side.
f and 6f (state of FIG. 1A), when the male terminal 4a is inserted and the slit 6b is opened, the inclined surface 6
f and 6f become parallel to each other, and the contact edge portions 6d and 6d come into contact with both side surfaces 4b and 4b of the male terminal 4a face to face (state of FIG. 1 (B)). Due to this surface contact, the male terminal 4a
Since the contact area of the female terminal 6a is increased, the contact resistance is reduced and heat generation can be suppressed.

In the above embodiment, the relay box 3 and the junction box 5 are taken as an example, but an electric connection box such as a fusible link box, or a plurality of layers of bus bar male terminals in one electric connection box. It goes without saying that it can also be applied to the connection of female terminals.

[0019]

As is apparent from the above description, in the bus bar terminal connection structure of the present invention, the contact edges of both side portions of the female terminal of the second bus bar are inserted before the male terminals of the first bus bar are inserted. , When the slit is formed by gradually increasing the slit from the tip side in the insertion direction toward the base side and inserting the male terminal and the slit is opened, the inclined surface becomes parallel and the contact edge is Since the two side surfaces are in face-to-face contact with each other, this surface contact increases the contact area between the male terminal and the female terminal, lowers the contact resistance, and suppresses heat generation.

[Brief description of drawings]

FIG. 1 is a terminal connection structure of a bus bar of the present invention,
(A) is a front view of a female terminal before inserting a male terminal, and (B) is a front view showing an inserted state of a male terminal and a female terminal.

FIG. 2A is a perspective view of a female terminal before insertion of a male terminal,
(B) is a perspective view showing a state where the male terminal and the female terminal are inserted.

3A is a perspective view of a relay box, and FIG. 3B is a perspective view of a junction box.

FIG. 4 is a cross-sectional view of a connection state between a relay box and a junction box.

FIG. 5 is a conventional bus bar terminal connection structure,
(A) is a front view of a female terminal before inserting a male terminal, and (B) is a front view showing an inserted state of a male terminal and a female terminal.

[Explanation of symbols]

 3 Relay Box 4 1st Bus Bar 4a Male Terminal 4b Both Sides 5 Junction Box 6 2nd Bus Bar 6a Female Terminal 6b Slit 6c Both Sides 6d Contact Edge 6e Enlarged Part 6f Inclined Surface A Insertion Direction

Claims (1)

[Claims] 1. A male terminal formed by bending the end portion of the first bus bar into a slit of a female terminal formed by bending the end portion of the second bus bar in a direction orthogonal to the female terminal. A terminal connection structure for a bus bar to be inserted and connected from the above, wherein both side portions of the slit of the female terminal of the second bus bar are formed at contact edge portions contacting both side surfaces of the male terminal, and the slit is provided. An enlarged portion that elastically opens and closes the slit is formed on the base side of the contact edge portions of the both side pieces, when the slit is opened when the male terminal is inserted,
A terminal connection structure for a bus bar, characterized in that the male terminal is formed into an inclined surface in which the slit width gradually increases from the tip end side in the insertion direction toward the base side so as to come into contact with both side surfaces of the male terminal face to face.