JPH0340049Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrical connection box that prevents water and other foreign substances from entering the box through terminal through-holes formed in the box.

[Conventional technology and problems]

As an electrical connection box that houses a wiring board inside,
As shown in FIGS. 7 to 10, a wiring board 4 on which a bus bar 3 is disposed is attached to the inner bottom surface of the electrical connection box 1 via a rubber plate 2. As shown in FIGS.

Below the end of the bus bar 3 (electrical junction box 1
The terminals 5 protruding toward the inner bottom surface of the rubber plate 2 and the terminal holes 1a of the electrical junction box 1
penetrates and protrudes to the outside.

On the other hand, the terminal 6 protruding upward is connected to the cover body 7.
is inserted into the connector 8 of.

The terminal through-holes 2a of the rubber plate 2 are connected to the terminals 5 to prevent water or dust from entering from the outside of the electrical junction box 1 through the through-holes 1a and 2a and causing accidents such as electrical leakage. You must make sure that there are no gaps between.

Therefore, the width of the terminal through hole 2a must be the same as or slightly less than the width of the terminal 5. 2).

However, it is difficult to precisely align the spacing between the plurality of terminals 5 and the pitch of the through holes 2a of the rubber plate 2 at the manufacturing and assembly stages of each component.

Furthermore, the relative pitch error between the terminal 5 and the through hole 2a will cause undue strain on the rubber plate 2.
This causes cracks to occur in the through hole 2a.

Furthermore, for the convenience of assembly work, a chamfer 1b is provided on the inner wall surface of the through hole 1a in order to make it easier to insert the terminal 5 into the through hole 1a of the electrical connection box 1.
The rubber plate 2 becomes movable toward the chamfered portion 1b, and the tight connection between the rubber plate 2 and the terminal 5 is no longer maintained, causing an electric leakage accident due to the ingress of water or the like.

Further, as the rubber plate 2 moves toward the chamfered portion 1b, cracks are generated in the rubber plate 2, which aggravates the cause of the above-mentioned electric leakage accident.

The present invention provides an electrical connection box that completely seals the gap between the terminal 5 and the through hole 2a to prevent electrical leakage accidents and the like, and does not cause cracks in the rubber plate.

[Means for solving problems]

The present invention provides a concave portion in the rubber plate penetrating portion of a terminal that protrudes from the busbar end of a wiring board housed in a box to the outside through a through hole in a rubber plate and a box wall. The rubber plate through-hole is brought into close contact with the concave portion of the terminal by the contraction force of the rubber plate generated by inserting the spacer into the groove.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

Note that the same parts as in the conventional example are given the same reference numerals.

As shown in FIGS. 1 and 2, an electrical connection box 1
Terminals 10 protrude from the ends of busbars 3 on wiring board 4 housed inside through through-holes 9a of rubber plate 9 and through-holes 1a of the box wall of electrical connection box 1.

The dimensions of the through holes 9a and 1a are made slightly larger than the dimensions of the terminal 10 in order to absorb the relative error between the plurality of terminal pitches and the plurality of hole pitches and to facilitate the insertion of the terminal 10.

The terminal 10 is provided with a recess 10a around the entire circumference of the side surface where it is located on the rubber plate 9 in the attached state (see FIG. 3).

Furthermore, a protrusion 9b is provided on the rubber plate 9 at a position corresponding to the recess of the terminal (see FIG. 4).

The dimensions of the protrusion 9b must also be such that the terminals 10 can pass therethrough (approximately the same dimensions).

The rubber plate 9 is provided with a rectangular hollow groove 9c provided from the bottom surface so as to surround the through hole 9a.

A spacer 11 whose upper half has a rectangular hollow shape and whose lower half has a tapered shape is attached to the groove 9c (see FIG. 5).

The dimensions of the spacer 11 are such that when inserted into the groove 9c, the rubber plate 9 contracts to the center.
have smaller inner wall dimensions.

Therefore, after inserting the terminal 10 into the through hole 9a of the rubber plate 9, the spacer 11 is inserted into the groove 9c of the rubber plate 9.
When the terminal 1 is inserted, the rubber plate 9 contracts to the center and the terminal 1
It comes into close contact with the recess 10a of 0.

The tapered portion 11a of the spacer 11 has the same shape as the tapered portion 1b provided on the inner bottom side of the through hole 1a of the electrical connection box 1, and is fixed by the tapered portion 1b and does not move.

Also, since the part of the rubber plate 9 inside the spacer 11 is always pressed against the terminal 10 side,
It is in close contact with the terminal 10, and even if the rubber plate 9 is affected by heat, no gap will be created between the rubber plate 9 and the terminal 10.

〔effect〕

The present invention has the following effects.

(a) The rubber plate on the inside of the spacer is pressed against the terminal side by the spacer and comes into close contact with the terminal.

Therefore, the relative error in the pitch between the terminals and the pitch between the terminal through-holes is allowed within the range of the above-mentioned gap, making it easy to manufacture and assemble the parts.

(b) For the same reason as above, since the space between the terminal through-hole and the terminal is sealed, water and other foreign matter will not enter the electrical connection box, and electrical leakage and other accidents can be prevented.

(c) According to the conventional technology, the pitch error between the terminals and the terminal through hole caused excessive distortion to the rubber plate, which caused cracks to occur in the rubber plate. However, according to the present invention, the rubber plate No undue strain is applied to the plate, and since the terminal and spacer hold the clamping pressure, the cause of cracks caused by vibration of the rubber plate is eliminated.

(d) Since the rubber inside the spacer is pressed toward the terminal, there will be no gap between the terminal and the rubber plate even if the rubber plate is affected by heat.

[Brief explanation of the drawing]

Figures 1 to 6 show this embodiment, Figures 1 and 2 are front and side sectional views after assembly, Figure 3 is a perspective view of the terminal, and Figure 4 is a perspective view of the rubber plate. , 5th
The figure is a perspective view of the spacer, Figure 6 is a perspective view of the main parts of the electrical connection box, and Figures 7, 8, and 9 are perspective views of the electrical connection box, rubber plate, wiring board, and cover body in the conventional example, respectively. FIG. 10 shows a vertical cross-sectional view of the conventional example after assembly. DESCRIPTION OF SYMBOLS 1... Electrical connection box, 1b... Chamfer, 3... Bus bar, 4... Wiring board, 9... Rubber plate, 9a... Terminal insertion hole, 9b... Projection, 9c... Groove, 10...
...terminal, 10a...recess, 11...spacer.

Claims (1)

[Scope of utility model registration request] In an electrical connection box equipped with a terminal that protrudes to the outside from a busbar end of a wiring board housed in the box through a through hole in a rubber plate and a box wall, a spacer insertion groove is provided around the through hole in the rubber plate, An electrical connection box characterized in that a spacer is inserted into the spacer insertion groove.