JP2001251726A - Connection method for bus bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, when the number of electronic control components to be mounted is increased, the wiring pitch of a bus bar and the size of a wiring connection part become small, monitoring of mechanical connection strength and electric connection reliability required from the wiring connection becomes severe, that a large load cannot be applied in a connection from the viewpoint of reliability when a connection auxiliary terminal on one side is a terminal derived from a sealing part in a circuit board or the like and that it is required to readily and repeatedly inset, remove and mount a component and because the component which goes out of order must be replaced, when the number of components to be connected to the bus bar is large. SOLUTION: In a method, in which the bus bar comprising a plurality of connection parts is connected to an electronic component, a connection auxiliary member which comprises a grooved part at a third terminal end is connected permanently to the connection part of the bus bar, a terminal to be connected is inserted into the connection auxiliary member, and the bus bar is connected to the terminal, to be connected in a state where a third connection auxiliary member is electrically deformed by a fourth latch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for connecting a flexible wiring board using a bus bar.

[0002]

2. Description of the Related Art Conventionally, a wiring board using a bus bar has a circuit board wiring through which a large current flows from the viewpoint of improving connection reliability.
In addition, it is used as wiring for achieving space saving by eliminating the need for a wire harness or the like. For example, in a large-scale computer requiring a large current supply, such as a power supply mechanism disclosed in Japanese Patent Application Laid-Open No. 63-182897,
A bus bar is used to increase an allowable current value, reduce a voltage drop, and improve heat dissipation. Also, JP-A-8-26
As in the electronic control unit disclosed in Japanese Patent No. 8254, with the progress of electronic control of automobile parts, bus bars are used to reduce the installation space by integrating the wiring parts of the automobile control parts into a module. .

[0003] The bus bar has a conductor portion made of a copper-based material and an insulating portion made of an organic film such as polyimide, and is formed by bonding an organic film from both sides with a wiring pattern formed on the conductor portion. Since the conductor itself can be easily deformed, a three-dimensional three-dimensional wiring can be easily formed. For this reason, there is an advantage that a design according to the space for installing the wiring can be performed. The bus bar and the mounted components are connected by a method such as wire bonding, welding, caulking, or a connector according to the required specifications of the connection portion.

[0004]

By the way, as the number of mounted electronic control parts increases, the number of connection portions formed on the bus bar also increases. On the other hand, since the area in which the bus bar wiring can be formed at one time is also limited, the wiring width or the wiring pitch of the bus bar must be reduced. Further, as the modularization of the wiring board, the electronic components, and the control board progresses, it is required to reduce the wiring width or the wiring pitch in order to realize the space saving of the module installation part.

[0005] Due to an increase in the value of current flowing inside the bus bar due to an increase in the number of control parts connected to the bus bar, and an increase in current density due to a reduction in the size of the bus bar connection portion, connection of the bus bar connection portion such as improvement in heat resistance has been made. Maintenance or improvement of reliability is required. In order to ensure connection reliability, it is necessary to select a method that can obtain a stronger connection strength and connect. Soldering and wire bonding have low connection strength, and in the case of connector connection, reliability can be ensured only when the combination of the specified male and female terminals is used, but when connecting with the bus bar, the reliability decreases. There are drawbacks that cannot be used. For this reason, the connection has to use a method involving permanent deformation such as welding or caulking. On the other hand, if a part connected to the bus bar breaks down and needs to be replaced, or if a connection failure occurs due to permanent deformation such as welding, the defective connection is repaired and the module is regenerated. There is a disadvantage that there is no means to do so. For this reason, defective products must be discarded. In particular, when the number of mounted components is large or when there are expensive components, the module has a disadvantage that the cost is increased.

[0006]

In order to enable easy detachment, it is necessary to expand the contact area in an elastically deformed state that does not cause permanent deformation to secure mechanical and electrical connection reliability. Solves the problem.

[0007]

Embodiments of the present invention will be described below.

FIG. 1 is a cross-sectional view schematically showing a first connection structure of the present invention, and shows an example in which a bus bar is connected to a terminal drawn from a circuit board. In the figure, 10 is a round pin terminal, 11 is a wiring stopper, 12 is a connection auxiliary terminal, 13 is a bus bar end, 14 is an electric circuit box, 1
Reference numeral 5 denotes a connection auxiliary terminal mounting hole, and reference numeral 16 denotes a caulking portion of the connection auxiliary terminal. Inside the electric circuit box 14, there is a circuit board (not shown), which is in a sealed state. The round pin terminal 10 is a member used to draw a wiring from a terminal of a circuit board (not shown) to the outside of the electric circuit box 14 and is fixed to the electric circuit box 14 with a sealing material. For example, when the sealing material is glass, there is a further restriction that a large load cannot be applied to the round pin terminal when connecting the bus bar from the viewpoint of connection reliability. It is needless to say that a plurality of round pin terminals 10 are drawn out because they are boards for controlling the input and output of power and signals from the circuit board. The bus bar end 13 and the connection auxiliary terminal 12 are permanently connected by caulking. Further, the round pin terminal 10 has a structure in which the wiring stopper 11 is fixed by screwing in a state of being inserted inside the connection auxiliary terminal 12. FIG. 2 is a diagram showing a detailed structure of the connection auxiliary terminal 12. In the figure,
Reference numerals 20a and 20b denote grooved portions, 21 denotes a screw groove portion, and 22 denotes a pressing collar. The grooved portion 20b corresponds to a starting point of a caulking portion for permanent connection with the bus bar 13. When the round pin terminal 10 is inserted into the connection auxiliary terminal 12 and then the wiring stopper 11 is screwed in, the groove 20a is brought into contact with the protrusion inside the wiring stopper 11 and is elastically deformed. It has a structure to connect to. Therefore, the round pin terminal 10 can be connected without applying a load. In addition, since the connection is made by elastic deformation, repeated insertion and removal can be performed.

FIG. 3 is a view showing an example of a manufacturing method for the first connection structure of the present invention. In the drawing, reference numeral 30 denotes a connection auxiliary terminal insertion hole processing portion, 31 denotes a connection auxiliary terminal holding jig, 3
2 denotes a connection auxiliary terminal caulking jig, and 33 denotes a caulking portion.
Hereinafter, description will be made with reference to the drawings.

At the end of the bus bar 13, a connection auxiliary terminal insertion hole processing portion 31 into which a connection jig can be inserted is formed by a method such as punching. With the connection auxiliary terminal 12 inserted into the connection auxiliary terminal insertion hole processing portion 31, the connection auxiliary terminal 12
Is pressed down from above by a connection auxiliary terminal holding jig 31, and from below the connection auxiliary terminal 12, a connection auxiliary terminal caulking jig 32 is pressed.
Press. The lower part of the connection auxiliary terminal 12 is
Since there is 0b, the groove is deformed starting from this groove and fixed to the bus bar 13 in a so-called crossed state. Next, the round pin terminal 10 drawn out of the electronic circuit box 14 from below the connection auxiliary terminal 12 is inserted. In this state, the connection auxiliary terminal 12 is screwed using the stopper 11. Stopper 11
Has a structure in which the grooved portion 20a of the connection auxiliary terminal 12 is pushed in by screwing.
The round pin terminal is tightened, and as a result, the round pin terminal 10 and the bus bar 13 can be fastened. As a result, it is possible to maintain a reliability such as a connection strength required for a connection portion of the wiring, and to realize a connection structure that can be easily inserted and removed without securing a space for components for connection.

FIG. 4 is a cross-sectional view schematically showing a second connection structure of the present invention, in which a bus bar is connected to a terminal drawn from a circuit board as an example. As described above, the connection that can be repeatedly inserted and detached can be achieved by utilizing elastic deformation. Therefore, instead of the above-mentioned screw type, the connection assist is provided as shown in FIG. A protrusion 41 is provided on the outer periphery of the terminal 12 and a recess is provided inside the stopper 11 so that the protrusion 41 can be fitted, so that reliability such as connection strength required for a connection portion of a wiring is maintained even by a fitting connection method. In addition, a connection structure that can be easily inserted and removed can be realized without securing a space for parts for connection.

[0012]

As described above in detail, according to the structure of the present invention, since the bus bar and the round pin terminal are connected by the elastic deformation of the connection auxiliary jig, the insertion and detachment can be repeatedly performed. . Further, by controlling the fastening force of the screw and the shape of the stopper, the connection strength between the connection jig and the round pin terminal can be controlled. Although the connection between the bus bar and the terminal is possible, the terminal can be connected without applying a load at the time of fastening, so that the hermetic sealing of the terminal is not hindered.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a connection structure between a bus bar and a terminal according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a structure of a connection auxiliary terminal according to one embodiment of the present invention.

FIG. 3 is a diagram illustrating a method of connecting a bus bar and a terminal according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating a connection structure between a bus bar and a terminal according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Round pin terminal, 11 ... Wiring stopper, 12 ... Connection auxiliary terminal, 13 ... Busbar end part, 14 ... Electric circuit box, 20 ...
Groove, 21 ... thread, 22 ... press collar, 30
... connection auxiliary terminal insertion hole processing portion, 31 ... connection auxiliary terminal holding jig, 32 ... connection auxiliary terminal caulking jig, 33 ... caulking portion, 41 ... protrusion.

Claims (5)

[Claims] 1. A method of connecting a bus bar having a plurality of connecting portions to an electronic component, wherein a connecting auxiliary member having a grooved portion at a third terminal end is permanently connected to the connecting portion of the bus bar, and a terminal to be connected is provided. A bus bar connection method, wherein the third connection auxiliary member is connected to a terminal to be connected in a state where the third connection auxiliary member is elastically deformed by a fourth stopper after inserting the third connection auxiliary member into the connection auxiliary member. 2. The bus bar connection method according to claim 1, wherein the method of permanently connecting the connection auxiliary member having a grooved portion to the third terminal end is caulking. 3. The bus bar connection method according to claim 1, wherein the auxiliary connection member having a groove at the end of the third terminal is made of a copper alloy. 4. A bus bar connection method according to claim 1, wherein said connection auxiliary member having a groove at the end of said third terminal is a hollow pipe. 5. The bus bar connection method according to claim 1, wherein the terminal to be fitted is a round pin terminal.