JPS6215933Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to fusible links.

A fusible link is a part of the low-voltage wiring of a car that is inserted in series with wires that have a thinner cross-sectional area than the wires of the circuit, and if the wiring is grounded or shorted midway due to a collision, etc., short-circuit current will be generated. This prevents fire from occurring from the wiring harness.

This fusible link uses wires that are two to three ranks lower than the wires of a normal circuit, and uses a connection method as shown in FIG.

In other words, 1 and 1' are electric wires for low-voltage wiring of automobiles, and female connectors 2 and 2' are connected to the terminal ends of the electric wires. Terminal fittings (not shown) are installed inside.) 3 is a fusible link (chloroprene coated wire) having a cross-sectional area 2 to 3 ranks lower than the wires 1 and 1', and connectors 4 and 4' are attached to both ends of the link, which are fitted to the connectors 2 and 2'. By doing so, it is connected to the electric wires 1 and 1'.

However, according to the above method, there are problems such as voltage drop and heat generation due to poor contact at the crimping part of the electric wire and the terminal fitting, and at the connection part between the terminal fittings. This requires a large number of parts such as ', which makes the electric wire (or wiring harness) bulky, and there are problems in that it requires troublesome work to connect the connector.

This invention was made to solve such problems.

An embodiment of this invention will be explained below based on the drawings. In Figures 2A to 2D, W indicates a part of an automotive wire assembly (wire harness), and three low-voltage wires (vinyl electric wires, etc.) a, b
and c are arranged approximately in parallel.

In the middle of one of these low-voltage electric wires a, the insulation coating is stripped off to provide an intermediate exposed conductor portion 5. On the other hand, the other electric wires b and c are connected to the intermediate exposed conductor portion 5
A part of the electric wire is cut and removed within the length range, and the insulation coating is stripped off to provide terminal exposed conductor portions 6 and 6' at both ends, respectively. Then, the terminal exposed conductor portions 6, 6' of each of the electric wires b, c are connected and fixed to the intermediate exposed conductor portion 5 by crimp terminals 7.

As a result, the intermediate exposed conductor portion 5 is connected to each electric wire a, b,
It is configured as a common fusible link of c. In other words, if we assume that the three wires a, b, and c are combined into one wire, the intermediate exposed conductor portion 5, which has a conductor cross-sectional area of 1/3 of the lower standard wire, can be used as a fusible link. This means that it was intervened as.

Finally, the exposed conductor portion is covered with a heat-resistant insulating tube 8 such as a glass braided tube, and both ends are wrapped and fixed with tape 9 to obtain a fusible link integrated with the electric wire.

Note that the fusible link obtained in this way has dotted lines P on both sides, for example in FIG.
Cut at the part 3 and peel off the terminals of each wire a to c.
It is also possible to use it as one component by connecting it to an electric wire having the same cross-sectional area as the actual electric wires a to c by spot welding or the like.

The above example describes an example in which one of three low-voltage wires is provided with an intermediate exposed conductor part, but if there are five low-voltage wires, two of them are provided with an intermediate exposed conductor part, and so on. Various combinations can be taken in consideration of the number of electric wires and the fusible link standards required therefor.

As mentioned above, this idea involves stripping off the insulation coating in the middle of at least one of the plurality of low-voltage electric wires for automobiles that are arranged approximately parallel to each other to provide an intermediate exposed conductor part. The electric wire is cut and stripped in correspondence with the intermediate exposed conductor portion, and terminal exposed conductor portions are provided at both ends, and these terminal exposed conductor portions are connected and fixed to the intermediate exposed conductor portions respectively, and the electric wire and fusible link are created. Since these are integrated, problems such as voltage drop and heat generation at the crimped part of the electric wire and terminal fitting have been solved, and connectors, etc. for connecting the electric wire and the fusible link are no longer required. There are effects such as

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a conventional fusible link connection method, and FIGS. 2A to 2D are explanatory diagrams showing the process of forming a fusible link according to this invention. a, b, c... Low voltage electric wire for automobiles, 5... Intermediate exposed conductor portion, 6... Terminal exposed conductor portion.

Claims (1)

[Scope of utility model registration request] At least one of the plurality of automobile low-voltage electric wires a, b, c, etc. arranged substantially in parallel is stripped of its insulation coating in the middle to provide an intermediate exposed conductor part 5, and the other electric wires b, In c..., the wires are cut and stripped corresponding to the intermediate exposed conductor portion 5, and terminal exposed conductor portions 6, 6' are provided at both ends, and these terminal exposed conductor portions 6, 6' are connected to the intermediate exposed conductor portion 5. A fusible link characterized by being fixedly connected to each other.