JP4800660B2 - Electrical junction box - Google Patents

Description

  The present invention relates to an electric junction box in which current is supplied and cut off, and more particularly to improvement of a bus bar which is a member for electric wiring.

  There are two types of electrical wiring: the type in which wiring is performed directly on the substrate by etching (printed wiring) and the type in which wiring is performed on the substrate using members such as lead wires, harnesses, bus bars, etc. Uses different wiring members such as lead wires, harnesses, and bus bars according to the purpose and application. The above-mentioned bus bar is formed by punching a band plate member into a desired shape and bending it.

In particular, in the electrical wiring using the bus bar, the bus bar is fastened so that there is some play by providing a locking portion at a required place on a plate for wiring such as a substrate or a case. In other words, the bus bar locked to the plate is fastened to such an extent that a contact sound between the plate and the bus bar is generated if the bus bar is touched with a hand or the like.
This is due to the fact that wiring by the bus bar does not necessarily require high-precision assembly to the wiring and the workability when wiring the bus bar to the plate.

By the way, as a structure that is wired using such a bus bar, there is an electrical connection box that energizes / cuts off / detects a current by installing power distribution parts such as an electromagnetic relay and a voltage sensor in a case body. This electric junction box is, for example, a hybrid vehicle, an electric vehicle, etc., in which a battery, an ignition switch, an inverter, etc. are arranged so as to pass through this electric junction box, and based on an output signal from the ignition switch. The electromagnetic relay is operated, and the voltage sensor is used to transmit the main power to the inverter while detecting the state of the battery.
An electrical connection box wired using such a bus bar may generate abnormal noise due to vibration of the bus bar when the vehicle is driven unless measures are taken to mount the bus bar.

Conventionally, in this type of electrical junction box, there is no solution to such a problem as far as the inventors can know, but attention is paid to the battery connection plate for the generation of abnormal noise that is a contact sound between the plate and the bus bar. Some have been suppressed.
The battery connection plate includes a bus bar for connecting each of the arranged batteries and a plate main body to which the bus bar is mounted, and the plate main body is provided with a suppressing portion for suppressing rattling of the bus bar. Thus, the above problem is solved (see, for example, Patent Document 1).

JP2004-095380 (2nd page, FIG. 3)

  Although the prior art provided with the restraining part that suppresses the rattling of the bus bar in the plate body is suitable for achieving the above-mentioned problem, the conventional plate not including the restraining part (including other than the prior art plate) From the viewpoint of the assembly operator, it is extremely preferable that the bus bar can be assembled to and the same as before. Further, when this assembly is performed using an automatic machine, it is not necessary to change the automatic machine.

  Therefore, an object of the present invention is to provide a bus bar and an electrical junction box that can prevent the generation of abnormal noise by suppressing the rattling of the bus bar by the conventional assembly of the bus bar and the assembly that is not changed at all.

In order to achieve the above technical problem, the electrical junction box according to the present invention employs the following technical means.
That is, the electrical junction box according to claim 1 includes a strip-shaped bus bar that is wired to one of the first plate and the second plate and is mounted on the other plate, An electrical junction box that is shut off or the like, wherein the bus bar is provided with a bent portion that is pressed against and fixed to the other plate when the bus bar is mounted on the other plate, The bent portion engages with a protrusion formed on the mounting surface of the bus bar on the one plate .
An electrical junction box according to claim 2 is the electrical connection box according to claim 1, wherein the first plate is a lower case to which the bus bar is wired, and the second plate is engaged with the lower case. It is an intermediate plate engaged with the lower case.

  According to the present invention, a bus bar is provided with a bent portion formed of a convex boss or a notch piece cut and raised in a substantially U shape, or a bent portion formed by convexly curving a part of the bus bar. Since the bus bar is wired to either the first plate or the second plate and the bent portion is pressed by the other plate to fix the position, the conventional plate without the suppression portion is provided. With the same assembling of the bus bar to the front, the backlash of the bus bar can be suppressed.

In addition, when the assembly of the bus bar to the plate is performed using an automatic machine, there is no need to change the automatic machine, so that existing production equipment can be used.
In addition, by configuring the electrical junction box using the bus bar that is the main part of the present invention, for example, an electrical junction box can be provided in which no abnormal noise is generated when the automobile is running.

  Further, by providing the bent portion on the bus bar side instead of the case side (for example, the upper case), it is possible to give a certain degree of elasticity. For example, compared with the case where the biasing protrusion is formed on the case side, Can absorb dimensional errors. Furthermore, by providing positioning protrusions etc. that engage with the bent portion on the lower case surface where the bent portion is located, the bus bar is arranged at a required position on the lower case surface without providing a positioning communication hole in the bus bar. Can be set.

  Next, an embodiment of an electrical junction box according to the present invention will be described. In the figure, symbol A is an electrical junction box, symbol 1 is a lower case (corresponding to the first plate), symbol 2 is a power distribution component, symbol 3 is a bus bar, and symbol 4 is an upper case (corresponding to the second plate). Respectively.

The electrical junction box A according to the present embodiment includes a lower case 1, a power distribution component 2, a bus bar 3, and an upper case 4.
The lower case 1 has a substantially rectangular shape in external view in which a bus bar mounting surface 11 on which a bus bar 3 to be described later is mounted at a predetermined position and a projection 12 is protruded and a power distribution component storage portion 13 are recessed on the upper surface side. Presents.
The power distribution component 2 includes a fuse, an electromagnetic relay (not shown), connectors, a voltage sensor, and the like that are stored in the power distribution component storage unit 13.

  As shown in FIG. 2, the bus bar 3 is formed in a band shape by a press device or the like so as to form a desired wiring pattern such as a conductive metal plate, for example, a copper plate, as shown in FIG. It is bent and formed as an electrical connection portion 31 with the power distribution component 2 such as a connector.

  Other than the electrical connection portion 31 is a wiring portion 32 (horizontal portion in FIG. 3), and a communication hole 33 that engages with the protrusion 12 protruding from the lower case 1 is provided at an arbitrary position of the wiring portion 32. Further, one or a plurality of bent portions 34 formed of bosses drawn into a substantially hemispherical convex shape are formed between the communication holes 33 (see FIG. 2). 2). The position of the bent portion 34 is not particularly limited.

  The upper case 4 is formed in a required shape so that the bottom side thereof biases the bent portion 34 of the bus bar 3 placed on the bus bar placement surface 11 described above, and is detachable from the lower case 1. Shaped to fit.

  In the electrical junction box A configured in this way, first, the communication hole 33 of the bus bar 3 is inserted into the protrusion 12 in the bus bar mounting surface 11 with the bent portion 34 facing upward, and the bus bar 3 is mounted on the lower case 1. Put. Then, the power distribution component 2 is housed in the power distribution component housing portion 13 provided with the electrical connection portion 31 so as to be electrically connected and mechanically connected.

  In the present embodiment, the communication hole 33 of the bus bar 3 is inserted into the protrusion 12 in the bus bar mounting surface 11 with the bent portion 34 facing upward, and the bus bar 3 is mounted on the lower case 1. The protrusion 12 may be provided so as to engage with the bent portion 34. In this case, the communication hole 33 of the bus bar 3 is not necessary, which is preferable. Similarly, in other modes 2 and 3 of the bus bar described later, the protrusion 12 is engaged with the bent portions 34a and 34b (in this case, the protrusion 12 is preferably formed in a rib shape having a required width). May be provided.

  Next, the upper case 4 is fitted to the lower case 1 to be in a closed state. At this time, the bottom surface of the upper case 4 presses against the bent portion 34, and the entire bus bar 3 is urged toward the lower case 1 (the bent portion 34 is elastically deformed). In this way, the upper case 4 is fitted to the lower case 1, and at the same time, the bus bar 3 is fixed in position without rattling, and the assembly is completed (see FIG. 3).

  The electrical junction box A (see FIG. 9) assembled in this way is provided so as to pass through a battery, an ignition switch, an inverter and the like (none of which are shown). And the electromagnetic relay in the electrical junction box A act | operates based on the output signal from an ignition switch, and transmits main power to an inverter. At this time, the voltage sensor described above detects the state of the battery and outputs it to a control unit (not shown).

  The electric junction box A configured as described above is incorporated in a vehicle, so that even if the behavior of the vehicle at the time of traveling or the vibration of the engine propagates, no abnormal noise based on the bus bar 3 is generated from the electric junction box A. Therefore, the quietness of the automobile can be improved.

  The bus bar which is the main part of the present invention includes, for example, the following modes in addition to those exemplified above. In addition, since structures other than the bending part 34 are the same structures as the bus bar 3 illustrated above, detailed description is abbreviate | omitted with the same code | symbol, and the bending part which is a principal part is demonstrated.

(Other aspects of bus bar 1)
As shown in FIG. 5, the bent portion 34 a of the bus bar 3 a as another aspect 1 is formed by notching a part of the wiring portion 32 into a substantially U shape when the bus bar 3 a is punched and press-molded, and raising the portion in an inclined manner. One or a plurality of cutout pieces formed so as to be elastically deformable (in FIG. 5, two are formed so that the open end portions face each other).

  As shown in FIG. 6, the bus bar 3 a formed in this way is bent by a notch piece by placing the bus bar 3 a on the bus bar placing surface 11 and fitting the upper case 4 to the lower case 1. The upper case 4 is in pressure contact with the portion 34a, and the entire bus bar 3a is urged toward the lower case 1, so that the position of the bus bar 3a is fixed without rattling.

(Other aspects 2 of the bus bar)
As shown in FIG. 7, the bent part 34b of the bus bar 3b as another aspect 2 is formed by convexly bending a part of the wiring part 32 into a semicircular shape, and one or a plurality of the bent parts 34b are formed ( Two are formed in FIG. 7).

  As shown in FIG. 8, the bus bar 3 b formed in this way is placed on the bus bar mounting surface 11, and the upper case 4 is fitted to the lower case 1, so that the semicircular convex The upper case 4 comes into pressure contact with the bent portion 34b formed of a curve, and the entire bus bar 3b is urged toward the lower case 1 so that the position of the bus bar 3b is fixed without rattling.

  As mentioned above, although the electric junction box concerning this embodiment was explained, the embodiment mentioned above shows an example of the suitable embodiment of the present invention, and the present invention is not limited to it, Various modifications can be made without departing from the scope of the invention.

It is an electric connection box concerning this embodiment, and is a partial expansion perspective view in the state where a bus bar was built in a lower case. It is a perspective view of a bus bar. It is a fragmentary longitudinal cross-sectional view of the state which incorporated the bus bar. It is a disassembled perspective view of the electrical junction box concerning this Embodiment. It is a perspective view of the bus bar of other mode 1. It is a fragmentary longitudinal cross-sectional view of the state which incorporated the bus bar of other modes 1. It is a perspective view of the bus bar of other mode 2. It is a fragmentary longitudinal cross-sectional view of the state which incorporated the bus bar of other modes 2. It is a perspective view of an electrical junction box.

Explanation of symbols

A Electrical connection box 1 Lower case 11 Bus bar mounting surface 12 Protrusion 13 Power distribution part storage part 2 Power distribution part 3, 3a, 3b Bus bar 31 Electrical connection part 32 Wiring part 33 Communication hole 34, 34a, 34b Bent part 4 Upper case

Claims (2)

An electrical connection box having a strip-shaped bus bar wired to one of the first plate and the second plate and mounted on the other plate, and carrying on / off current etc. ,
The bus bar is provided with a bent portion that is fixed in position by being pressed against the other plate when the bus bar is mounted on the other plate,
The said bending part engages with the protrusion formed in the mounting surface of the said bus bar in said one plate, The electrical junction box characterized by the above-mentioned . The first plate is a lower case to which the bus bar is wired, and the second plate is an upper case engaged with the lower case or an intermediate plate engaged with the lower case. The electrical junction box according to claim 1.

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