JP2005166599A - Wire connection structure of fuse box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure of a fuse box for simplifying connection work between a bus bar and a terminal. <P>SOLUTION: This wire connection structure 1 of a fuse box is so structured that, by fitting a terminal 21 attached to the tip of a wire to a connection tab 12 projected from the bus bar 4 connected with a fuse incorporated in the fuse box, the wire is connected to the bus bar 4. The wire connection structure is characterized in that the terminal 21 has a plate 32 and a stopping piece 34 having a shape raised from both sides of the plate 32 and folded back inward; and the connection tab 12 is held between tips 38 of the stopping piece 34 on both its sides and the plate 32. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wire connection structure of a fuse box.

Conventionally, as a wire connection structure of a fuse box that distributes power in a fuse box used in an automobile or the like, (a) a structure that distributes power on the terminal side and (b) a power supply in a circuit in the box There is a thing of the structure which performs distribution. As the structure of (a), as shown in FIG. 8, each connecting portion (terminal) 105 of the connecting terminal 102 connected to the electric wire 101 is inserted into a housing 104 with a lance provided with a locking lance 103. As a structure of (b), there is provided a structure in which a round terminal (LA terminal) is fastened and fixed to a terminal fixing portion of a box using bolts and nuts (for example, Patent Document 1). reference.).
JP 2001-319557 A

Incidentally, the wire connection structure shown in FIG. 8 (the structure (a) described above) has the following problems.
(1) As described above, the power distribution is performed on the connecting terminal 102 side. However, the housing 104 with the lance is an essential structure, and it is difficult to reduce the size of the fuse box.
(2) Since the connection portion 105 is positioned on the inner wall surface of the housing 104 with the lance, if the design of the connection portion 105 is to be changed, the housing 104 with the lance must also be changed. As a result, the fuse box The design changes must also be made. For this reason, for example, if the size of the connection portion 105 is changed for each applied current value, the types of the housing 104 with a lance and the fuse box increase, which is unsatisfactory in terms of cost.
(3) The connecting terminal 102 needs accuracy for connection stability, needs to be handled with care so as not to be deformed during transportation, and takes time and effort.
(4) Since the shape of the continuous terminal 102 constituted by 2 to 5 stations is complicated, an automatic process using an automatic cutting and crimping machine cannot be performed for the crimping operation with the electric wire 101. This requires a dedicated crimping die, which is unsatisfactory in terms of cost.
(5) Even when the above-described crimping die is used, since the structure of the connecting terminal is complicated, it takes time to insert and take out, and the working efficiency is deteriorated.

Further, the connection structure (b) has the following problems.
(1) It is connected and fixed by tightening with bolts and nuts, and tightening torque management is required, which complicates the work and also requires tightening confirmation work.
(2) In the first place, it takes time and labor in the tightening work using tools.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fuse box connection structure that simplifies connection work between a bus bar and a terminal.

In order to achieve the above object, the present invention proposes the following means.
In the invention according to claim 1, the wire is inserted into the bus bar by inserting a terminal attached to the tip of the wire into a connection tab protruding from the bus bar that is incorporated in the fuse box and connected to the fuse. The terminal has a plate portion and pressing pieces having a shape that is raised from both sides of the plate portion and folded inward. The connection tab is held between the plate portion and the plate portion.

  According to the wire connection structure of the fuse box according to the present invention, the power distribution is performed by the bus bar in the fuse box. When the terminal is inserted into the connection tab, the connection tab is interposed between the pressing piece and the plate portion. By being held, the bus bar and the electric wire are connected. As a result, a housing with a lance as in the conventional structure is not required. Moreover, the connection (connection which can be electrically conducted) between the bus bar and the electric wire can be realized very simply by inserting the terminal into the connection tab. Terminal insertion and connection to the connection tab can be performed with one touch without using a tool.

According to a second aspect of the present invention, in the electric wire connection structure of the fuse box according to the second aspect, the connection tab inserted between the pressing piece on both sides and the plate portion is elastically applied to the pressing piece. In addition to being pressed by the portion, the elastic member provided in the plate portion is biased toward the pressing piece.
According to the electric wire connection structure of the fuse box according to the present invention, the connection tab inserted between the plate portion and the pressing piece is urged toward the holding piece by the elastic force of the elastic member, so that it is held more firmly. can do. Therefore, even if a force in the direction of pulling out from the connection tab acts on the terminal, the connection state between the two is firmly maintained without being separated from each other because they are firmly pressed by the elastic force.

According to a third aspect of the present invention, in the electric wire connection structure of the fuse box according to the first or second aspect, an engagement hole is formed in one of the connection tab and the plate portion, and the other is engaged. A mating projection is formed, and the connection tab inserted between the tip of the pressing piece on both sides and the plate portion is brought into contact with the plate portion by the engagement of the engagement hole and the engagement projection. It is locked.
According to the electric wire connection structure of the fuse box according to the present invention, when the terminal is inserted into the connection tab, it is locked by the engagement between the engagement hole formed in the connection tab and the engagement protrusion formed in the terminal. Therefore, even if a force in the direction of pulling out from the connection tab acts on the terminal, the connection state between the two is firmly maintained without being separated from each other because it is firmly pressed by the elastic force.

  According to the present invention, since a housing with a lance as in the conventional structure is not required, the fuse box can be easily reduced in size and cost, and, for example, a terminal design corresponding to an applicable current value, etc. There is an advantage that the degree of freedom of change is improved. The improvement in the design flexibility of the terminal is a structure in which it is connected so as to be assembled to the connection tab of the bus bar. For example, by not using a housing for connecting terminals such as a well-known housing with a lance, This is because there is no need (or the relaxation) of the shape accuracy of the terminal to ensure an appropriate insertion state. Thus, by eliminating the terminal connection housing from the fuse box, for example, it is possible to obtain various advantages such as being able to cope with various applied current values only by changing the design of the terminal at the end of the electric wire. It is also possible to make the terminal difficult to be deformed by an external force acting during transportation. Further, according to the present invention, the connection between the bus bar and the electric wire can be realized very simply by inserting the terminal into the connection tab, and the connection workability can be improved. When the terminal is inserted into the connection tab, the connection tab is held between the pressing piece and the plate portion, so that the connection work between the bus bar and the electric wire can be easily performed.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the electric wire connection structure 1 of this fuse box has a structure for distributing power on the bus bar side. A fuse box 2 used in the electric wire connection structure 1 of this fuse box is mounted on a vehicle such as an automobile, and is used for connecting or branching power supply wires to various electric equipment units. 3 is a schematic structure in which a bus bar 4 is incorporated. Moreover, the code | symbol 5 in FIG. 1 is an electric wire connected with the power supply, and the code | symbol 6 is a fuse. Here, the base housing 3 is formed of, for example, an insulating resin.

  The bus bar 4 is formed by pressing one metal thin conductive plate and formed from one part. Here, the upper side in FIG. 1 is the fuse connection side. The bus bar 4 includes a main plate portion 10, a plurality of fuse connection tabs 11 (three in this case) protruding from the main plate portion 10 on the fuse connection side, and a side opposite to the fuse connection side (lower side in FIG. 1). In the following description, only one connection tab 12 (hereinafter also referred to as a terminal connection tab) is provided on the terminal connection side. In addition, although the connection tab 11 for fuses which connects the fuse 6 was made into the 3 series, it is not restricted to this, For example, a 2, 4, 5 series may be sufficient.

  As shown in FIG. 2, the fuse box electric wire connection structure 1 is configured such that a terminal 21 attached to the tip of the electric wire 5 is inserted (extrapolated) into a connection tab 12 protruding from the bus bar 4. 5 and the bus bar 4 are connected so as to be electrically conductive, and the electric wire 5, the fuse 6, and an electric circuit (including a relay or the like) connected to the fuse 6 are connected via the bus bar 4. The connection tab 12 is formed with an engagement hole 22 to be engaged with an engagement protrusion 43b described later. The fuse box 2 is not provided with a member for guiding the movement of the terminal 21 to be inserted into the connection tab 12 such as a housing for positioning the terminal 21.

As shown in FIG. 5, the terminal 21 is formed from one component formed by pressing one conductive metal plate, and is exposed at the end of the electric wire 5 connected to the power source. An electric wire connecting portion 31 for connecting and fixing the core wire 5a, and extending from the electric wire connecting portion 31, and inserting (extrapolating) the connecting tab 12 to hold the connecting tab 12 And a terminal main body portion 21 </ b> A that is externally connected to the connection tab 12. The terminal main body portion 21A includes a flat plate portion 32, a pressing piece 34 that is raised from both sides of the plate portion 32 and folded back to the inside of the plate portion 32, and is shown in FIG. Thus, it is comprised from the latching board part (elastic member) 35 turned back from the front end side (side opposite to the electric wire connection part 31) of the plate part 32. As shown in FIG. The plate portion 32 is formed with an opening portion 36 into which a protruding portion 42 protruding from the locking plate portion 35 enters, and an opening portion 37 through which a plate piece 32 penetrates a rising piece 44 described later.
The holding piece 34 is formed so that the tip portion 38 faces the plate portion 32. The distance between the plate portion 32 and the tip portion 38 is the same as or slightly narrower than the thickness of the connection tab 12 shown in FIG.

As shown in FIG. 6A, the locking plate portion 35 is formed so that a portion extending from the plate metal plate forming the plate portion 32 is folded back at the front end side of the plate portion 32 so as to overlap the plate portion 32. Is. The locking plate portion 35 has an elastic force that is pressed against the plate portion 32 by the elasticity of the metal plate forming the locking plate portion 35 at the base end portion (elastic member) 41 (continuous portion with the plate portion 32). Is working. The protrusion 42 projecting at the center in the extending direction from the tip of the plate portion 32 of the locking plate portion 35 is formed by forming the locking plate portion 35 by pressing or the like, A step 43a and an engagement protrusion 43b, which is a small protrusion protruding from the step 43a, are provided. The size of the stepped portion 43 a is slightly smaller than the opening 36, and enters the opening 36. Further, by entering into the engagement hole 22 in which the connection tab 12 into which the engagement protrusion 43b and the terminal 21 are inserted is formed, a function of retaining the terminal 21 from the connection tab 12 is prevented. In addition, the engagement protrusion 43 b here also functions to prevent the displacement of the terminal 21 with respect to the connection tab 12 by engaging with the engagement hole 22.
In addition, the base end portion 41 is formed with a pressing portion 41a having a slightly raised shape on the tab contact surface 32a of the plate portion 32 (specifically, on the extension of the tab contact surface 32a). At the time of insertion, the pressing portion 41a can be pressed against the distal end portion 32 so as to push up the connection tab 12, and can be clamped. By the way, in this embodiment, since the pressing portion 41a is located at a position shifted from the pressing piece 44 on the tip end side of the plate portion 32, a fixing force that sandwiches and restrains the connection tab 12 between the pressing piece 44 is provided. It can be demonstrated more effectively.

  The rising piece 44 protrudes so as to rise from the tip of the plate portion 32 of the locking plate portion 35. The rising piece 44 functions as a lever for releasing the engagement between the engaging hole 22 and the engaging protrusion 43b, and as shown in FIG. By pushing in the A direction, the locking plate portion 35 is pushed in the arrow A direction, and the engaging protrusion 43b is also pushed down accordingly.

  In the above configuration, in order to connect the electric wire 5 and the bus bar 4, as shown in FIG. 2, the terminal 21 is inserted into the connection tab 12 of the bus bar 4 incorporated in advance in the fuse box 2. Since the distal end portion 23 of the connection tab 12 has a wedge shape, it can be easily inserted. Here, reference numeral 39 shown in FIG. 6 is a chamfered portion formed on the pressing piece 34.

  When the terminal 21 is further inserted after guiding the distal end portion 23 of the connection tab 12 between the plate portion 32 and the distal end portion 38 of the terminal 21, the connection tab 12 becomes the proximal end portion of the pressing piece 34 on both sides of the plate portion 32. The terminal 21 can be inserted while being maintained in a predetermined posture by being guided by (hereinafter referred to as the rising portion 37). When the terminal 21 (specifically, the terminal main body portion 21A) is inserted into the connection tab 12, the plate portion 32 (specifically, the tab contact surface 32a) and the tip end portion 38 of the pressing piece 34 are connected to the connection tab 12. The clamping force between the two acts. Further, the connection tab 12 is biased toward the pressing piece 34 of the terminal 21 by the elastic force of the locking plate portion 35. Thereby, as shown in FIGS. 3 and 7A, the connection tab 12 is held between the plate portion 32 and the pressing piece 34, and the contact state between the connection tab 12 and the terminal 21 is stably secured. The electrical connection state is reliably maintained.

  Furthermore, as shown to Fig.7 (a), the engagement protrusion part 43b formed in the latching board part 35 is fitted by the engagement hole 22 formed in the connection tab 12, and is latched. Even when a force in the pulling direction is applied to the terminal 21, the engaging protrusion 43 b is caught in the engaging hole 22 and the pulling of the terminal 21 from the connection tab 12 is restricted. The connection state between the connection tab 12 and the terminal 21 can be kept stable against a pulling force such as a tensile force. Since the terminal 21 inserted in the connection tab 12 is assembled to the connection tab 12 itself and the connection state with respect to the connection tab 12 is maintained, the fuse box 2 has a locking means for locking the terminal 21, There is no need to separately provide positioning guide means for insertion. For example, it is not necessary to install a housing with a lance. For this reason, the degree of freedom in designing the fuse box and the bus bar forming the power distribution circuit in the fuse box is improved, and the fuse box can be reduced in size and density.

  In the above configuration, in order to pull the terminal 21 from the connection tab 12, the rising piece 44 is pressed toward the arrow A direction as shown in FIG. That is, the rising piece 44 that protrudes from the locking plate portion 35 to the plate portion 32 through the opening portion 37 is pushed toward the opening portion 37. Then, with the base end portion 41 as a base point, the locking plate portion 35 is pushed down, and the engagement protrusion 43b is also pushed down accordingly. As a result, the engagement between the engagement hole 22 of the connection tab 12 and the engagement protrusion 43b of the terminal 21 is released, so that the terminal 21 can be pulled out of the connection tab 12 by a pulling operation of the terminal 21.

According to the above configuration, the connection tab 12 is sandwiched between the plate portion 32 and the distal end portion 38 of the pressing piece 34 by simply inserting the terminal 21 into the connection tab 12, and the elasticity of the locking plate portion 35. The connection tab 12 is pressed against the pressing piece 34 by force, and the engagement protrusion 43 b is locked in the engagement hole 22. As a result, a housing with a lance for locking the connection portion is not required unlike the power supply connection structure in which the conventional terminal is inserted into the bus bar, so that the fuse box 2 can be reduced in size and cost, for example, There is an advantage that the degree of freedom in changing the design of the terminal corresponding to the applied current value is improved. Further, by simply inserting the terminal 21 into the connection tab 12, the connection between the bus bar 4 and the electric wire 5 can be realized very easily, and the connection workability can be improved. When the terminal 21 is inserted into the connection tab 12, the connection tab 12 is held between the pressing piece 34 and the plate portion 32, so that the connection work between the bus bar 4 and the electric wire 5 can be easily performed. In addition, since the engagement between the engagement hole 22 and the engagement protrusion 43b can be released by pressing the rising piece 44, the connection tab 12 and the terminal 21 can be attached and detached with one touch.
Further, since the structure of the terminal 21 is simple, the crimping operation can be performed in an automatic process using an automatic cutting and crimping machine.

  In the above embodiment, the engagement hole 22 is formed in the connection tab 12 and the engagement protrusion 43b is formed in the terminal 21. However, the present invention is not limited to this. Good. Even with the above configuration, the same effect as the above-described embodiment can be obtained.

It is a schematic block diagram which shows the fuse box which concerns on one Embodiment of this invention. It is a top view which shows the electric wire connection structure of the fuse box which concerns on one Embodiment of this invention, and is a top view which shows the state which the connection tab and the terminal left | separated. It is a top view which shows the electric wire connection structure of the fuse box which concerns on one Embodiment of this invention, and is a top view which shows the state which the connection tab and the terminal connected. It is a side view which shows the front-end | tip part of the connection tab shown in FIG.2 and FIG.3. It is a figure which shows the terminal shown in FIG.2 and FIG.3, (a) is a top view, (b) is an enlarged front view. FIG. 3 is a cross-sectional view of the terminal shown in FIG. 2, where (a) is a cross-sectional view showing a state in which an engaging protrusion is pushed up by a locking plate part, and (b) is a cross-section showing a state in which the engaging protrusion is pushed down. FIG. It is sectional drawing which shows the connection state of the connection tab shown in FIG. 2, and a terminal, (a) is sectional drawing which shows a connection state, (b) is sectional drawing which shows the separated state. It is a schematic block diagram which shows the electric wire connection structure of the conventional fuse box.

Explanation of symbols

1 Wire connection structure of fuse box 4 Bus bar 12 Connection tab 21 Terminal 32 Plate portion 34 Holding piece 38 Connection portion

Claims (3)

The wire is connected to the bus bar by inserting the terminal attached to the tip of the wire into the connection tab protruding from the bus bar that is built into the fuse box and connected to the fuse. ,
The terminal includes a plate portion and a pressing piece having a shape that is raised from both sides of the plate portion and folded inside.
An electric wire connection structure of a fuse box, wherein the connection tab is held between a tip portion of the pressing piece on both sides and the plate portion. The connection tabs inserted between the pressing pieces on both sides and the plate portion are pressed into the plate portion by the pressing pieces by elasticity, and the pressing pieces are attached to the pressing pieces by elastic members provided in the plate portions. 2. The fuse box electric wire connection structure according to claim 1, wherein the electric wire is connected to the fuse box. An engagement hole is formed in one of the connection tab and the plate portion, and an engagement protrusion is formed on the other, and is inserted between the tip portion of the pressing piece on both sides and the plate portion. The wire connection structure for a fuse box according to claim 1 or 2, wherein the connected tab is locked to the plate portion by engagement of an engagement hole and an engagement protrusion.

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