JPH055798Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention is an electrical connection box for wiring by attaching a power connector to which a power distribution line is connected, and a case for accommodating a printed circuit board to which the above-mentioned connector is connected. It has the following. These electrical junction boxes are also used in fields such as electrical equipment and vehicles.

"Prior Art and Its Problems" Electrical junction boxes that house printed circuit boards have been well known, but the printed circuit boards often rattle inside the electrical junction box, causing abnormal noises and vibrations. There were problems such as damage caused by the connector, and problems such as cracks occurring when connecting and disconnecting the connector.

"Means for Solving the Problem" In order to solve the above-mentioned problems, the present invention aims to solve the above-mentioned problems in an electrical junction box in which a printed circuit board 1 with electrical components attached is sandwiched between upper and lower cases. A slope is formed on the inner surface of the tip of the support column that protrudes from the support column, and the slope is engaged with the corner of the substrate, and the substrate is pressed by a projection provided on the inner surface of the other case that is latched to one case. This structure allows the board to be firmly held between the upper and lower cases.

"Embodiments" Hereinafter, embodiments of the present invention shown in the drawings will be described.
An electric circuit is printed on the back side of the printed circuit board 1 shown in FIG. 1B by copper plating or the like.
Electrical components such as transistors (not shown) are wired thereto by inserting conductive wires into the substrate holes from the surface. Further, a connector 11 is attached to the front surface, and a terminal (not shown) is connected to the electrical circuit on the back surface. Cutting angle 1 of the substrate 1 shown in FIG. 1B
Since this substrate 1 is approximately rectangular, the numbers 0 are provided at the four corners. On the other hand, since the printed circuit board 1 is generally formed by punching out a paper phenol sheet board, its cut surface is perpendicular to the front and back surfaces.

Therefore, at the cutting angle 10 of the substrate shown in FIG. 1B, the cut surface and the front or back surface are adjacent to each other at right angles and have relatively steep ridges. On the other hand, the first
The case 2 shown in FIG. A supporting column 3 is provided protruding from each corner so as to be in contact with it. The cross section of the support column 3 is L-shaped, and the inner surface of the tip of the support column 3 has a slope 4 of about 45 degrees that becomes narrower toward the tip. As clearly shown in FIG. 2, the cutting angle 10 of the substrate 1 is dimensioned so as to engage each slope 4. As shown in FIG. Further, as described above, since the cutting angle 10 is configured to lock onto the slope 4, it is natural that the substrate 1
The contour of the substrate 1, in particular the spacing between the cutting angles 10, must be smaller than the spacing between the outer sides of the support columns 3, so that a rectangular substrate 1, as clearly shown in FIG.
A chamfer with a cutting angle of 10 is applied to a part that is set back from the side edge. On the other hand, six protrusions 9 are provided at the inner corners of the bottom and side surfaces of the case 8 shown in FIG. 1C. The upper surface of this protrusion 9 is in contact with the back surface on which the substrate 1 is placed, as clearly shown in FIG. Furthermore, six locking claws 7 are cut into the side wall of the case 8 on both sides and are provided in a cantilever shape. The distal end of the locking pawl 7 has a pawl having an outwardly tapered slope. Also, this locking claw 7
A locking hole 6 for locking is provided in the side wall of the case 2, as shown in FIG. 1A.

As is clear from FIG. 2, the side wall of the case 8 is dimensioned to slide inside the side wall of the case 2, so the slope of the above-mentioned locking pawl 7 engages with the edge of the side wall of the case 2. The locking pawl 7 is elastically restored and locked. Due to the locking mechanism between the cases 2 and 8, a slight clearance (dimensional margin) between the cases 2 and 8 is required.

In general, the printed circuit board 1 has copper plating or copper foil attached to the board surface, and has a relatively large coefficient of thermal expansion. Therefore, if the board 1 bends due to temperature rise during use, electrical connection failure will occur. Therefore, it is preferable to use a holding structure that does not cause bending. In view of this need, in this proposal, the expansion and contraction strain in the planar direction of the substrate 1, which has a relatively large thermal expansion, is alleviated by the planar clearance and the vertical clearance, and the rattling is prevented. This is solved by the elastic contact action between the cutting angle 10 of the substrate 1 and the cutting angle 10 of the substrate 1.

Further, since the cases 2 and 8 of the present invention are both manufactured by injection molding of synthetic resin, it is easy to mold the slope 4, and it is extremely suitable for manufacturing an electrical connection box.

[Brief explanation of the drawing]

Figure 1A is a perspective view of the upper case in the embodiment of the present invention, Figure 1B is a perspective view of the board, Figure 1C is a perspective view of the lower case, and Figure 2 is a sectional view of the main parts. be. 1... Board, 2... Case, 3... Support column, 4
... slope, 5 ... corner, 6 ... locking hole, 7 ... locking claw, 8 ... case, 9 ... projection, 10 ... cutting angle, 11 ... connector, 12 ... window.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an electrical connection box in which a printed circuit board 1 with electrical components attached is sandwiched and housed between upper and lower cases 2 and 8, one of the cases 2 protrudes from one case 2 at a nearly right angle to the board 1. A slope 4 is formed on the inner surface of the tip of the support column 3.
the other case 8 which forms a slope 4 and engages with the corner 5 of the board and is locked to one case 2.
An electrical connection box characterized in that the board 1 is firmly held between the upper and lower cases by pressing the board 1 with projections 9 provided on the inner surface of the box. (2) The slope 4 of the support column 3 having an L-shaped cross section is cut at the adjacent cutting angle 10 of the corner 5 of the substrate 1 by two vertically connected surfaces.
2. The electrical connection box according to claim 1, wherein the electrical connection box is pressed into contact with both sides of the electrical connection box.