JPH04137431U - electrical junction box - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent local temperature rise inside due to energization,
To provide an electrical connection box with improved reliability and durability. [Structure] A busbar pattern 1 is wired on an electrically insulating board 2, and the electrically insulating boards 2 are laminated in multiple layers to form boxes 3a and 3b.
In the electrical connection box housed inside, an electrical insulating plate 2 is made of silicone resin.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to an electrical connection box mounted on an automobile.

0002

[Prior art]

An electrical connection box mounted on an automobile has a structure as shown in FIG. 1, for example. That is, a busbar pattern 1 made of conductors formed in a required circuit is made of polypropylene. Injection of thermoplastic resins such as polybutylene (PP) and polybutylene terephthalate (PBT). Wiring is performed on the formed insulating plate 2. This insulating plate 2 is laminated in multiple layers to form a resin upper box. It is assembled inside the body 3a and the lower box body 3b. on the top or bottom surface of the box bodies 3a, 3b. Attach electrical parts such as fuse 4 and connector 5.

0003

[Problem that the idea aims to solve]

In recent years, as automobiles have become more sophisticated, the wiring inside electrical junction boxes has become denser and the amount of current flowing has increased. tends to be large. As a result, temperature rise inside the electrical junction box has become a serious problem. ing. This temperature rise is caused by the circuits and electrical components connected to the ends of the busbar pattern, and It varies depending on the degree of energizing current and also varies depending on the location on the bus bar pattern. Ru. Excessive temperature rise is often a limited part of the busbar pattern. , effectively suppresses excessive temperature rise by dissipating that heat to areas where the temperature rise is small. can be prevented. However, conventional electrical insulation plates that contact the busbar pattern have poor thermal conductivity. Unfortunately, the heat generated in the busbar pattern could not be efficiently dissipated.

0004

[Means and actions to solve the problem]

This invention provides an electrical connection box that solves the above problems. The electric insulating plates were laminated in multiple layers and housed in a box. An electrical connection box characterized in that the electrical insulation board is made of silicone resin. It is. In this way, when the electrical insulating board is made of silicone resin, the silicone resin becomes a heat conductor. Because each part on the busbar pattern has excellent heat absorption or or heating is performed effectively. As a result, the temperature of the entire busbar pattern becomes uniform. and the maximum temperature is relaxed.

[0005]

【Example】

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is an exploded perspective view of an electrical junction box, and the symbols are as explained in the prior art. Ru. The electrical insulation board 2 on which the busbar pattern 1 is wired is made of silicone resin. Ru. Silicone resin is a resin with silicon in the main chain of the polymer, and is a hard resin. A variety of materials can be used, ranging from rubber-like materials to rubber-like materials. Also, it may damage the properties of the resin. Use fibrous fillers such as glass fiber, or talc or quartz powder as long as it does not bend. Inorganic powder fillers such as can be added. This electrical insulating board 2 can be made by punching out a sheet, compression molding, Processed into a predetermined shape by molding with a mold, such as through transfer molding. . The thermal conductivity of conventionally used general products such as PP and PBT is 0.2 to 0.25K. cal/m・Hr・℃, while the thermal conductivity of silicone resin is 1.1Kc. Al/m・Hr・°C, and has a thermal conductivity that is about 5 times higher. Therefore, In the electrical junction box of this example, the internal temperature is more uniform than that of the conventional one. It will be done.

[0006]

[Effect of the idea]

As explained above, according to the present invention, the busbar pattern is wired on an electrically insulating board. In an electrical connection box in which a plurality of electrical insulating boards are laminated and housed in a box, the electrical Since the air insulating board is made of silicone resin, the maximum internal temperature rise is reduced and reliability is improved. It has the excellent effect of improving durability.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of an electrical connection box.

[Explanation of symbols]

1 Busbar pattern 2 Insulating board 3a, 3b box body 4 Fuse 5 Connector

Claims (1)

[Scope of utility model registration request] 1. An electrical connection box in which a busbar pattern is wired on an electrically insulating board and a plurality of the electrically insulating boards are laminated and housed in a box body, wherein the electrically insulating board is made of silicone resin. connection box.