JP3560200B2 - Connection terminal mounting structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a connection terminal mounting structure, wherein one end of a bus bar is bent into an L-shape to form an arm portion, and a U-shaped slot is formed in the arm portion along a direction in which the arm portion extends, and the arm portion is cracked by the slot. For a fuse in an electric connection box for automobiles, in which the upper ends of the arm portions are bulged inwardly to form a constricted portion, and a terminal holding rib projecting upward from the laminate is brought into contact with the back surface of the end of the bus bar. Connection terminal mounting structure.
[0002]
[Prior art]
A conventional connection terminal mounting structure will be described with reference to FIGS. 5 to 7. FIG. 5 is a partial cross-sectional view showing a conventional connection terminal mounting structure mounted on an electric junction box 100 for an automobile. FIG. FIG. 7 is a side view for generally explaining a state in which the fuse 104 is inserted into this portion.
[0003]
In the electric junction box 100 having a laminated structure provided with bus bar wiring used for an electric circuit for an automobile, the connection of the fuse 104 is made by connecting a pair of L-shaped bent ends of the one and the other bus bars 101 so as to face each other. The two aligned legs 104a and 104b of the fuse 104 are inserted into a U-shaped slot 108 formed in a busbar-integrated fuse terminal portion of a type in which the arm portion 107 is exposed to the outside of the cover 111 of the electric junction box. It is done by.
[0004]
The arm portion 107 to which the fuse is directly engaged has a lower end portion, that is, a bent portion of the bus bar, which is formed integrally with the laminated plate inside the connection box by a terminal holding rib 102 which is provided upward and parallel to the terminal surface 103. The leg 104a, 104b of the fuse 104 is supported and bears the downward pressing force generated when the leg portion 104a, 104b of the fuse 104 is inserted into the U-shaped slot 108 of the arm portion 107. In this case, the rib 102 is dimensioned so as to abut on the back side of the arm portion 107, that is, the entire width of the bus bar 101.
[0005]
In general, the terminal pressing ribs 102 are formed as thin vertical projections having a small width in consideration of stable supportability and weight reduction of the laminated plate, and the side surfaces of the terminal pressing ribs 102 are opposed surfaces of the arm portion 107. It is arranged substantially in parallel or flush with a certain terminal surface 103, and in any case, is configured to be supported from the back surface over the entire width of the bus bar.
[0006]
As can be understood from FIGS. 6 and 7, the above-mentioned U-shaped slot 108 is formed along the extending direction of the arm portion 107, and the lower end thereof extends to the vicinity of the bent portion of the bus bar 101. The upper end has a constricted portion 108a defined by a pair of curved portions 107a bulging out from both sides. When the tip of the leg portion 104a is pushed into the U-shaped slot 108 through the constricted portion 108a when the fuse 104 is attached, a pressing force acts on the arm portion 107 directly downward, and this pressing force is applied to the terminal holding rib 102. Received by
[0007]
Because the legs 104a of the fuse 104 are primarily in electrical contact with the constriction 108a, their engagement must be as close as possible in order to minimize contact resistance. Therefore, the width of the constricted portion 108a must be smaller than the thickness of the fuse leg 104a, and at the same time, a certain amount of elastic stress acts due to the action of the left and right arms 107 in order to secure stable connection. There is a need.
[0008]
[Problems to be solved by the invention]
In order to satisfy this condition, the upper end of the arm 107 is forcibly opened about the arm base 106 in the direction of arrow χ when the legs 104a and 104b of the fuse 104 are pushed. However, if this elastic stress exceeds a certain limit, it shifts to plastic deformation, and it may become impossible to elastically support the fuse legs 104a, 104b. Therefore, in order to avoid such a risk, the arm portion 107 and the arm base portion 106 must have great elasticity.
[0009]
Accordingly, an object of the present invention is to facilitate and easily push a fuse leg into such a portion, and at the same time, increase elasticity to obtain a secure and stable grip and an electrical contact state of the fuse leg.
[0010]
[Means for Solving the Problems]
The object according to the present invention is such that the terminal holding ribs are arranged along the extension direction of the bus bar, and at the same time, the thickness thereof is formed in a thin plate shape smaller than the width of the arm portion or the bus bar. In order to facilitate the expansion of the arm portion with respect to the insertion of the fuse leg when attaching the holding leg, the holding rib is so formed that the center axis of the slot coincides with the center plane including the vertical axis of the rib. This is achieved by providing a connection terminal mounting structure characterized in that the connection terminal is positioned on the laminate at right angles to the terminal surface of the arm portion.
[0011]
With such a configuration, the forked portion of the arm portion defined by the U-shaped slot is easily expanded when the fuse leg portion passes through and is locked by the constriction portion, and the holding portion is also formed. The ribs abut at positions where they can exhibit flexibility along the extension direction of the bus bar, so that the elastic deformation at the time of fuse insertion that previously only acted on the base of the arm extends to the bus bar portion. It becomes possible to expand the elastic region and increase the gripping force.
[0012]
In addition, according to one embodiment of the present invention, the above object of the present invention is attained by that the thickness of the terminal holding rib is smaller than the width of the U-shaped slot. With such a dimension setting, the support portion on the back surface of the bus bar becomes a knife-edge shape, so that the bending of the bus bar along the extension direction of the bus bar becomes easy, and a greater elastic stress and gripping force are exerted. .
[0013]
Further, according to another embodiment of the present invention, the above object according to the present invention also has a configuration in which the terminal pressing rib extends to the other end of the adjacent bus bar to form a single rib. And a configuration shared by the connection terminals. As described above, the configuration in which one terminal holding rib is commonly used to contact the rear side of the left and right bus bar ends is simplified when designing the rib by integral molding with the laminated plate. It will be easier.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. It should be noted that the present invention is not limited to the embodiment described below, and various modifications are possible based on the technical idea of the present invention.
[0015]
FIG. 1 is a partial perspective view showing one embodiment relating to a mounting structure of a fuse connection terminal according to the present invention, and FIG. 2 is a side view for explaining a state where a fuse 4 is inserted into the mounting structure. is there. FIG. 3 is a partial cross-sectional view showing a connection terminal mounting structure according to the present invention mounted on the electric junction box 10 for an automobile, and FIG. 4 is a partial cross-sectional view showing the same connection terminal mounting structure as that of FIG. However, the difference is that the terminal holding rib 20 is a single common member.
[0016]
1 and 3, the bus bar 1 is wired in a state of being floated from the laminate 9 and is also separated from the upper plate 12 of a cover 11 that covers the laminate. A recess 14 is formed in the center of the upper plate 12, and two aligned legs 4 a and 4 b of the fuse 4 form two holes drilled in the recess from outside the electrical junction box 10. Through this, it can be fitted into the arm 7 of the connection terminal mounting structure according to the present invention.
[0017]
One end of the bus bar 1 is bent into an L-shape to form an arm portion 7, and the arm portion 7 is provided with a U-shaped slot 8 extending in the direction of extension thereof. The forked portions 7b, 7b are formed from the upper part to the upper part. Further, at the upper end of the arm portion, in order to form a constricted portion 8a at the upper part of the U-shaped slot 8, there are bulging portions 7a, 7a which inward each other. This arm portion 7 is arranged substantially in parallel with the other arm portion forming another terminal on the same line in actual mounting, and the two legs 4a and 4b of the fuse 4 are respectively connected to the respective U-shaped slots. 8 to complete the electrical connection.
[0018]
When the leg portions 4a and 4b of the fuse 4 are pushed into the U-shaped slot 8, the vertical pressing force generated in the arm portion 7 is at least at a position directly below the arm portion 7 on the end back surface 5 of the bus bar 1, that is, the bus bar. Are supported by the terminal pressing ribs 2 which abut against the back surface of the bent portion of the terminal. The terminal pressing ribs 2 protrude upward from the laminated plate 9. The terminal pressing ribs 2 are preferably formed by integral molding with the laminated plate. It's not a big deal, so it's fine.
[0019]
Further, the terminal pressing ribs 2 are arranged along the extension direction of the bus bar 1 and have a thin plate shape whose thickness is smaller than the width W of the arm portion 7 or the bus bar 1. What is important about the terminal holding rib 2 is that, when the fuse 4 is attached to the pair of left and right arms, the upper ends of the forked portions 7b, 7b of the arms are cracked when the fuse legs 4a, 4b are pushed. In order to facilitate the expansion, the holding rib 2 is positioned with respect to the terminal surface 3 of the arm portion 7 such that the center axis "a" of the slot 8 coincides with the center plane including the vertical axis "b" of the rib. The point is that it is positioned on the laminate 9 at right angles.
[0020]
By aligning the center axis "a" of the slot 8 in the center plane including the vertical axis "b" of the rib in this manner, the holding rib 2 exhibits an arcuate flexibility along the extension direction of the bus bar 1. The contact between the terminal holding rib and the back surface of the bus bar is deformed by the bending deformation indicated by the white arrow "X" when the fuse is pushed in, which has only acted on the arm base 6 in the past. Since it occurs as a fulcrum, the elastic region of the arm portion is expanded to the bus bar, and at the same time, the concentration of elastic stress on the arm base 6 is avoided, and the possibility of plastic deformation of this portion is also avoided.
[0021]
More preferably, the thickness of the terminal holding rib 2 is made narrower than the width of the U-shaped slot 8 to improve the above-mentioned flexibility, and further elasticity and gripping force are obtained. The portions 4a and 4b can be pushed in smoothly, and at the same time, it is possible to obtain a secure and stable grip of the leg and an electrical contact state.
[0022]
Next, another embodiment shown in FIG. 4 will be briefly described. The terminal pressing rib 20 extends to the end of the other adjacent bus bar to form a single rib. Therefore, one terminal holding rib is shared by a pair of connection terminals, and when the rib is manufactured by integral molding with the laminated plate, the detailed structure is simplified, so that the design and manufacturing are facilitated.
[0023]
【The invention's effect】
According to the present invention, when the fuse leg is passed through and locked by the constricted portion, the bending deformation of the arm portion due to the expansion of the forked portion of the arm portion defined by the U-shaped slot, The elasticity and the gripping force are increased because the contact point between the terminal pressing rib and the back surface of the bus bar is generated as a fulcrum. As a result, the fuse leg can be smoothly pushed into the U-shaped slot, and at the same time, the leg can be reliably and stably stabilized. And an electrical contact state can be obtained. In addition, the elastic region of the arm portion is extended to the bus bar, and as a result, the effect of preventing concentration of elastic stress on the arm base portion and eliminating the possibility of plastic deformation occurring at this portion is obtained.
[Brief description of the drawings]
FIG. 1 is a partial perspective view showing one embodiment relating to a mounting structure of a fuse connection terminal according to the present invention.
FIG. 2 is a side view for explaining a use state of the mounting structure shown in FIG. 1;
FIG. 3 is a partial cross-sectional view showing a state in which the mounting structure of FIG.
FIG. 4 is a partial cross-sectional view showing a modification example similar to FIG.
FIG. 5 is a partial sectional view showing a state in which a conventional connection terminal mounting structure is mounted on an electric connection box for a vehicle.
FIG. 6 is a partial perspective view showing a conventional connection terminal mounting structure.
FIG. 7 is a side view for explaining a use state of a conventional connection terminal mounting structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bus bar 2 Terminal holding rib 3 Terminal surface 4 Fuse 4 a Fuse leg 5 End back surface 7 Arm 8 U-shaped slot 8 a Neck 9 Laminate board 20 Terminal holding rib a Center axis b (of U-shaped slot) b (Terminal holding rib) Vertical axis W (of busbar) width

Claims (3)

One end of the bus bar is bent into an L shape to form an arm portion, a U-shaped slot is formed in the arm portion along the direction of extension, and the upper ends of the arm portions cracked by the slot are directed toward each other. In a mounting structure of a fuse connection terminal in an automotive electrical connection box in which a constricted portion is formed by swelling and a terminal holding rib protruding upward from a laminated plate is brought into contact with the back surface of the end of the bus bar,
The terminal pressing ribs are arranged along the extension direction of the bus bar and at the same time are formed in a thin plate shape having a thickness smaller than the width of the arm portion or the bus bar,
Further, when the fuse is attached to the arm portion, in order to facilitate the expansion of the arm portion against the insertion of the fuse leg portion, the holding rib is formed by a center plane including a center axis of the slot and a vertical axis of the rib. A connection terminal mounting structure which is positioned on the laminated board at right angles to a terminal surface of the arm portion so as to match. The connection terminal mounting structure according to claim 1, wherein the thickness of the terminal holding rib is smaller than the width of the U-shaped slot. 2. The connection terminal mounting structure according to claim 1, wherein the terminal holding rib extends to an end of the other adjacent bus bar to form a single rib, and is shared by a pair of connection terminals. 3.

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