JP2006158133A - Electric connection box and its assembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable electric connection box in which assembling performance and maintainability are enhanced by arranging connection members such as harness properly and noise from the harness for high voltage part has no effect on the harness for low voltage part. <P>SOLUTION: An electromagnetic relay 21 is fixed to a lower case 11 through a fixing boss 11b. Furthermore, a harness 31a for low voltage part is wired in a gap H formed between the lower case 11 and the electromagnetic relay 21 by a fixing boss 11b such that it is held down and guided in a desired direction by the fixing boss 11b. A harness 31b for high voltage part and a bus bar 32 are screwed to a connection terminal 21a for high voltage part projected from the upper surface of the electromagnetic relay 21 and wired to be spaced apart from the harness 31a for low voltage part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electrical connection box that is used in, for example, a hybrid vehicle, an electric vehicle, a fuel cell vehicle, and the like, and that conducts, interrupts, and detects current, and more specifically, is connected to a distribution component that constitutes the electrical connection box. The present invention relates to an electrical junction box having an improved mounting structure for power distribution components and a heat dissipation method for the electrical junction box in order to improve the manageability of connection members such as harnesses and bus bars and to prevent noise.

Conventionally, there is an electrical junction box in which current distribution parts such as an electromagnetic relay and a voltage sensor are built in a case body to conduct, cut off, and detect current.
As an example of its use, this electrical junction box is, for example, a hybrid vehicle, an electric vehicle, a fuel cell vehicle, etc., in which a battery, an ignition switch, an inverter, etc. are disposed via this electrical junction box The electromagnetic relay is operated based on the output signal from the ignition switch, and the voltage sensor is used to transmit the main power to the inverter while detecting the state of the battery.

  There are various types of such electrical junction boxes, and for example, a structure in which a high voltage system circuit is wired with a bus bar and a group of wires and a low voltage system circuit is assembled with a set of wires, and a high voltage system is used. In a system circuit, a circuit in which a large current flows is arranged using a bus bar, and a circuit in which a medium current flows is arranged using a wire group.

  According to the electrical junction box described above, it is possible to realize a high-density wiring in a state in which various electrical components and the like are present, and therefore, it is extremely suitable that can contribute to cost reduction and improvement in maintainability. (See, for example, Patent Document 1).

JP 2000-253514 A (first page, FIG. 1)

  However, the conventional electrical junction box has a distribution part having a high-voltage part on the controlled side and a low-voltage part on the control side arranged in any desired position, and inside the case body constituting the electrical junction box. The connecting members such as the harnesses and bus bars for the high-pressure part and the low-pressure part described above are wired indefinitely and horizontally. As a result, a complicated internal configuration is likely to occur, and there are problems in assembly and maintenance.

  In addition, when the connection member for the high-voltage part is adjacent to the connection member for the low-voltage part, there is a risk that the connection member for the low-voltage part will spread the noise from the connection member for the high-voltage part. It is also possible to cause a malfunction.

  Therefore, the present invention pays attention to the mounting structure of power distribution components, and arranges connection members such as harnesses and bus bars to improve assemblability and maintainability, and reduces noise from the connection member for the high pressure portion. It is an object of the present invention to provide a highly reliable electrical junction box and an electrical junction box assembly method that eliminates fear of the connection member.

In order to achieve the above object, an electrical junction box and an electrical junction box assembly method according to the present invention employ the following technical means.
That is, an electrical junction box according to claim 1 is a connection of a power distribution component having a high-voltage part that is a controlled side and a low-voltage part that is a control side, and a harness or a bus bar that is electrically connected to the power distribution component. An electrical junction box that includes a member and a mounting plate to which the power distribution component is attached, and that conducts, cuts off, and detects current, so that the power distribution component is formed with a gap of a required width. The support member is attached to the mounting plate, the connection member connected to either the high-pressure part or the low-pressure part is wired in the gap, and the connection member connected to the other is connected to the connection member. The wiring is separated from the gap.
According to a second aspect of the present invention, in the electric junction box according to the first aspect, the support portion is an attachment boss having a required height protruding from the attachment plate.
According to a third aspect of the present invention, there is provided an electrical junction box according to the second aspect, comprising a lower case and an upper case detachably engaged with the lower case, and the mounting plate is the lower case and the mounting boss. Is characterized in that it projects from the bottom inner wall of the lower case, and the connecting member connected to the low-pressure portion is wired in the gap.
According to a fourth aspect of the present invention, in the electric junction box according to the second or third aspect, the mounting boss is provided at a required position so as to guide the connecting member in a desired direction.
An electrical junction box assembling method according to claim 5 includes a power distribution part having a high-voltage part on the controlled side and a low-voltage part on the control side, and a harness and a bus bar electrically connected to the power distribution part. A method of assembling an electrical junction box, comprising a connection member and a mounting plate to which the power distribution component is attached, wherein current is supplied, cut off, or detected, wherein either one of the high-voltage part or the low-voltage part Wiring the connecting member to be connected to the mounting plate, and attaching the power distribution component with a support portion interposed between the mounting plate and the one connecting member so as not to interfere with the one connecting member. A member is connected to the power distribution component, and the connection member connected to the other is connected to the power distribution component apart from the connection member connected to the one.
According to a sixth aspect of the present invention, there is provided an electrical junction box assembling method according to the fifth aspect, wherein the support portion is a mounting boss having a required height protruding from the mounting plate.
According to a seventh aspect of the present invention, there is provided an electrical junction box assembling method including the lower case and the upper case detachably engaged with the lower case, wherein the mounting plate is the lower case. The mounting boss projects from the bottom inner wall of the lower case, and the connection member connected to the low-pressure portion is wired to the mounting plate.
According to an eighth aspect of the present invention, there is provided an electrical junction box assembling method according to the sixth or seventh aspect, wherein the mounting boss is provided at a required position so as to guide the connecting member in a desired direction.

  According to the present invention, the power distribution component is attached to the mounting plate with the support portion interposed so that a gap having a required width is formed, and further, the gap is connected to either the high pressure portion or the low pressure portion. In addition, since the connecting member is wired and the connecting member connected to the other side is separated from the gap, the connecting member is neatly arranged to improve assemblability and maintainability, and noise from the connecting member for the high-voltage part. Thus, the connection member for the low-pressure part can eliminate fears and provide a highly reliable electrical junction box and an electrical junction box assembly method.

  In addition, since many low-voltage parts are provided in the lower part of the power-distribution parts, it is possible to realize a reasonable wiring by placing a connecting member connected to the low-voltage part in the gap. Since the above-mentioned gap is formed by projecting the mounting boss from the bottom inner wall of the lower case or the mounting plate to guide the connecting member in the desired direction, the connecting member can be fixed by simply assembling the power distribution parts it can. Therefore, the assemblability can be further improved.

  Next, an embodiment of an electrical junction box according to the present invention will be described with reference to the accompanying drawings. An electrical junction box according to the present invention is a component related to electrical equipment such as a hybrid vehicle, an electric vehicle, and a fuel cell vehicle, and a battery, an ignition switch, an inverter, and the like are arranged so as to pass through the electrical junction box. The electromagnetic relay is operated based on the output signal from the ignition switch, and the voltage sensor is used to transmit the main power to the inverter while detecting the state of the battery. In the figure, symbol A indicates an electrical junction box.

  The electrical connection box A according to the present embodiment includes a case main body 1, a power distribution component 2, and a connection member 3.

  The case body 1 includes a lower case 11, an upper case 12, and a vent hole 13, and is cast in a substantially box shape with an aluminum alloy, a magnesium alloy, or the like.

  The lower case 11 (mounting plate) is formed in a substantially U-shaped cross-sectional view in which a mounting portion 11a for being screwed to a frame of a hybrid vehicle, an electric vehicle, a fuel cell vehicle, etc. is projected in a horizontal direction from the lower side wall. Has been.

  A mounting boss 11b having a required height for mounting an electromagnetic relay 21, which will be described later, and a rib 11c project from the bottom inner wall of the lower case 11. The mounting boss 11b and the rib 11c are provided at a required position so as to guide a harness 31a for a low-pressure part to be described later in a desired direction.

  The mounting boss 11b is provided with a tapped hole (not shown) that is screwed to a bolt inserted into a mounting hole of an electromagnetic relay 21, which will be described later, in a direction in which a harness 31a for a low pressure section, which will be described later, is desired. The external shape is formed in a desired shape so as to guide.

  Further, the mounting boss 11b is formed at a required height slightly narrower than the outer diameter of the harness 31a for the low pressure section described later, and only for assembling the electromagnetic relay 21 described later, The harness 31a is pressed and fixed.

  On the other hand, the upper case 12 is provided with a radiating fin 12a on the upper surface, and is formed in a substantially U shape in sectional view so as to be detachably screwed to the lower case 11.

  The vent hole portion 13 includes a hollow container body 13a disposed at a required position on the upper surface of the upper case 12 so as to be substantially directly above an electromagnetic relay 21 described later, and a hollow hose 13b connected to the container body 13a. And is connected to a blower mechanism (not shown) provided in a hybrid vehicle, an electric vehicle, a fuel cell vehicle, etc., and air blown from a blower mechanism (not shown) during driving is blown to the vent hole 13 and the case body 1 Is supposed to cool.

  The power distribution component 2 has various sizes, including a main circuit for energizing / cutting off / detecting a current, and a protection circuit for protecting the electromagnetic relay 21 of the main circuit operated based on an output signal from the ignition switch. The electronic circuit component has a size, and includes an electromagnetic relay 21, a voltage sensor 22 that detects the state of the battery, and the like, and is housed in the lower case 11.

  In addition, the above-described power distribution component 2 includes, for example, a high voltage unit on the controlled side and a low voltage unit on the control side (for example, a control signal side for turning on / off the electromagnetic relay 21), such as the electromagnetic relay 21 and the voltage sensor 22. The power distribution component 2 having the above is also included.

  The connection member 3 includes a harness 31, a bus bar 32, and the like electrically connected to the power distribution component 2 composed of electronic circuit components of various sizes as described above in a desired wiring pattern. Etc. are configured.

Next, the main part of the present invention will be described.
First, an electrical junction box A according to the present invention is applied to a power distribution component 2 having a high-voltage portion that is a controlled side and a low-voltage portion that is a controlled side, and in this embodiment, an electromagnetic relay 21 that constitutes a main circuit. Is illustrated as the main part.

  That is, in the electromagnetic relay 21, the low-voltage harness 31a provided with the connector 33 is extended from the substantially lower center of the side wall on the short side, and the connection terminal 21a for the high-voltage portion projects from the upper surface. A mounting piece 21b provided with a mounting hole is provided in the vicinity of the corner near the lower side of the short side wall so as to form a substantially rectangular shape. The electromagnetic relay 21 is attached to the required position of the lower case 11 by screwing a bolt into the mounting boss 11b through the mounting hole.

  The harness 31a for the low-voltage part is mounted in the gap H having a required height formed by the mounting boss 11b between the electromagnetic relay 21 and the lower case 11, so that the mounting boss 11b is wired in the direction opposite to the extending direction. The above-mentioned connecting cable is abutted and guided so as to be wired in the direction opposite to the extending direction, and the low-voltage harness 31a and the connector guided by the rib 11c protruding from the lower case 11 33 is connected. At this time, the low-voltage harness 31a wired in the gap H is fixed by pressing the low-voltage harness 31a only by assembling the electromagnetic relay 21.

  On the other hand, the harness 31b for the high voltage part is screwed to one connection terminal 21a for the high voltage part protruding from the upper surface of the electromagnetic relay 21 and wired so as to be separated from the harness 31a for the low voltage part. Yes. The bus bar 32 is screwed to the connection terminal 21a for the other high voltage part.

  Thus, the electrical junction box A according to the present embodiment attaches the electromagnetic relay 21 to the lower case 11 with the mounting boss 11b interposed therebetween, and further, the lower case 11 and the electromagnetic relay 21 are connected by the mounting boss 11b. Wiring is performed so that the low-voltage harness 31a is pressed into the gap H formed therebetween and guided in a desired direction by the mounting boss 11b. Then, the harness 31b for the high voltage part is screwed to the connection terminal 21a for the high voltage part protruding from the upper surface of the electromagnetic relay 21, and wired so as to be separated from the harness 31a for the low voltage part.

  As described above, by configuring the electrical junction box A according to the present embodiment, the harness 31 is tidy and the assemblability and maintainability are improved, and the influence of noise from the high-voltage harness 31b is reduced. The electrical harness 31a is not received and becomes a highly reliable electrical junction box A.

  In the electrical junction box A according to the present embodiment, the power distribution component 2 and the connection member 3 are housed in the case body 1, and the lower case 11 and the upper case 12 are combined, and dust or the like is contained in the case body 1. Is sealed so that it does not enter, and is used in a hybrid vehicle, an electric vehicle, a fuel cell vehicle or the like.

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.

  For example, in the present embodiment, the attachment of the electromagnetic relay 21 constituting the main circuit is exemplified as a main part, but the present invention is not limited to this, and the high voltage part which is a controlled side such as the voltage sensor 22 and the control side are not limited thereto. The power distribution component 2 having a certain low-pressure part is applicable.

  Further, in the present embodiment, the connection member (harness) of the low voltage part is wired below the power distribution component. However, depending on the configuration of the power distribution component, the connection member of the low voltage part may be wired above the power distribution component. It ’s good.

  Moreover, the assembly method in the above-mentioned electrical junction box A may be used. That is, the connection member 3 such as the harness 31 connected to either the high-pressure part or the low-pressure part is wired to the attachment plate such as the lower case 11 and the above-described attachment to the attachment plate so as not to interfere with the one connection member 3 From the connecting member 3 connected to one side, the connecting member 3 connected to the other side is connected to the other side, and the connecting member 3 is connected to the other side of the connecting member 3 by interposing a support part such as the boss 11b. The electrical connection box A is assembled by being separated and connected to the power distribution component 2. Even in this case, as in the present embodiment, it is preferable that the support portion such as the mounting boss 11b is provided at a required position so as to guide the connecting member 3 in a desired direction.

It is a top view of the state which removed the upper case of the electrical junction box concerning this Embodiment. It is sectional drawing which follows the XX line in FIG. FIG. 2 is a cross-sectional view taken along line YY in FIG. It is a top view of the principal part of the electrical junction box concerning this Embodiment. It is a front view of the principal part of the electrical junction box concerning this Embodiment. It is a perspective view of the lower case of the electric junction box concerning this embodiment. It is a perspective view of the state where the connecting member was wired in the lower case of the electrical junction box according to the present embodiment. It is an exploded perspective view of the state where the upper case was removed.

Explanation of symbols

A Electrical connection box 1 Case main body 11 Lower case 11a Mounting portion 11b Mounting boss 11c Rib 12 Upper case 12a Radiation fin 13 Vent hole 13a Container body 13b Hollow hose 2 Power distribution component 21 Electromagnetic relay 21a Connection terminal 21b Mounting piece 22 Voltage sensor 3 Connecting member 31 Harness 31a Harness for low pressure part 31b Harness for high pressure part 32 Bus bar 33 Connector H Gap

Claims (8)

A power distribution component having a high-voltage part on the controlled side and a low-voltage part on the control side, a connection member such as a harness or a bus bar electrically connected to the power distribution component, and an installation in which the power distribution component is attached An electrical junction box that is energized, interrupted and detected,
The power distribution component is attached to the mounting plate with a support portion interposed so that a gap having a required width is formed, and the connection is connected to either the high pressure portion or the low pressure portion in the gap. An electrical junction box, characterized in that a member is wired and the connecting member connected to the other side is wired away from the gap. 2. The electrical junction box according to claim 1, wherein the support portion is a mounting boss having a required height protruding from the mounting plate. A lower case and an upper case removably engaged with the lower case, the mounting plate being the lower case, and the mounting boss projecting from the bottom inner wall of the lower case, The electrical connection box according to claim 2, wherein the connection member connected to the low-pressure portion is wired. The electrical connection box according to claim 2, wherein the mounting boss is provided at a required position so as to guide the connection member in a desired direction. A power distribution component having a high-voltage part on the controlled side and a low-voltage part on the control side, a connection member such as a harness or a bus bar electrically connected to the power distribution component, and an installation in which the power distribution component is attached And an electrical junction box assembly method in which current is applied, interrupted and detected.
Wiring the connection member connected to either the high-pressure part or the low-pressure part to the mounting plate;
In order not to interfere with the one connection member, the power distribution component is attached to the mounting plate via a support portion, and the one connection member is connected to the power distribution component.
The method for assembling an electrical connection box, wherein the connection member connected to the other is connected to the power distribution component at a distance from the connection member connected to the one. 6. The method of assembling an electrical junction box according to claim 5, wherein the support portion is a mounting boss having a required height protruding from the mounting plate. A lower case and an upper case detachably engaged with the lower case, the mounting plate being the lower case, and the mounting boss projecting from the bottom inner wall of the lower case, 7. The method of assembling an electric junction box according to claim 6, wherein the connection member connected to a portion is wired to the mounting plate. 8. The method of assembling an electrical junction box according to claim 6, wherein the mounting boss is provided at a required position so as to guide the connection member in a desired direction.

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