JP329I - Joint between busbar for joint box and insulating plate - Google Patents

Description

[Detailed description of the invention] Wiring inside devices such as automobiles and home appliances has traditionally been mainly done using electric wires. As circuits become more complicated, a wiring method called a wire harness, in which electric wires are joined to each other using electric wires 7 as shown in Fig. 1, is generally used. However, as circuits become more complicated, the number of joints increases when electric wires are joined to each other, which creates problems in terms of reliability and handling, and a conductor bus bar method as shown in Fig. 2, is adopted for branching circuits. This method is made up of a bus bar 1 and an insulating plate 2, and terminals 4 are provided at predetermined positions on the bus bar 1. This method is used as a joint box by stacking one or more layers and installing it inside a case, etc., and is used as a substitute for the wire joint shown in Fig. 1. This invention relates to the joint between the bus bar and the insulating plate used in this joint box. Conventionally, the bus bar and the insulating plate have been joined by adhesion, or by providing a groove in the insulating plate 2 through which the bar 1 passes as shown in Fig. 4, or by covering and gluing the bar 1 with an insulating film 9 as shown in Fig. 5. However, this method requires an adhesive and is troublesome. In the case of , the grooves are made to fit the bar shape using a mold or the like, which makes the process complicated, and there is also the inconvenience that the bar 1 and the plate 2 come off during assembly or handling. The biggest drawback is that the insulating plate 2 must also be changed when the bar shape is changed. In the case of , an extra process such as an adhesive treatment of a film or the like is required, and it is not suitable for terminals with upstanding terminals such as 4 in Fig. 2. In consideration of these points, the present invention has been made to eliminate the above drawbacks. That is, the joint between the busbar and the insulating plate of the present invention is such that a protrusion 5 shown in Fig. 3 is provided on the busbar 1 by protruding from the edge of the busbar and bending it, and this is inserted into and joined to the hole 6 in the insulating plate 2 to join the busbar and the insulating plate as shown in Fig. 2 and 3, but the present invention is particularly characterized in that the protrusion 5 of the busbar 1 is snap-fit into the hole 6 in the insulating plate 2 for joining. This makes it easier to make the mold for the insulating plate, and prevents the bus bar and insulating plate from coming off the plate 1 when they are assembled in the joint box or when they are handled. Even if the design of the bar shape is changed, the bar can be machined with a protrusion that fits the hole position, making it easier to change the design. Furthermore, even for narrow bus bars, the size of the protrusion can be freely selected and the protrusion can be easily formed. In particular, by using the snap fit connection, the protrusion 5 is inserted into the hole 6 in a press-fit manner and protrudes from the back surface of the insulating plate 2 and is engaged, so-called snap engagement is performed, improving the positioning accuracy and further preventing the bus bar from coming off the insulating plate. In this device, the holes and the protrusions that are joined thereto may be similar or different in shape. The holes and the protrusions may be joined by undercuts in addition to snap fits. Furthermore, the bus bar can be joined to both sides of the insulating plate 2 as shown in Figure 6. Also, as shown in Figure 7, the protrusions 5 can be raised higher than the insulating plate 2 and deformed by rolling, pressing, etc. to prevent the bar from falling off. The bars can be processed by punching, chemical etching, metal plating, etc. The protrusions can be processed by pressing, deep drawing, cutting, etc. The busbars can be made of copper, aluminum, iron, stainless steel, brass, bronze, or phosphorus bronze.
Materials with good corrosion resistance and low contact resistance, such as those plated with alloys containing these metals as the main components, can be used. The insulating plate can be made of polyethylene, polypropylene, polyvinyl chloride,
They are made of polyacrylonitrile, butadiene styrene copolymer, polyacetal, polystyrene, polyamide, polyethylene terephthalate, polybutylene terephthalate, phenol resin, unsaturated polyester, epoxy resin, diallyl phthalate, etc. Joint boxes made of these materials are used in automobiles, copiers,
It can be used in wire harnesses for electronic computers, etc.

[Brief explanation of the drawings] Fig. 1 is an explanatory diagram of a wire harness wiring method, Fig. 2 is an explanatory diagram of a joint box equipped with bus bars and insulating plates, Fig. 3 is an enlarged view (Figs. a and b) of two examples of the joint between the bus bar and insulating plate of the joint box in the present invention, and a back view (Fig. c) of a bus bar with a protrusion and its X-X' cross-sectional view, Figs. 4 and 5 are enlarged longitudinal front views of the joint between the bus bar and insulating plate in a conventional joint box, Fig. 4 shows a type in which a groove through which the bar passes is provided in the insulating plate, Fig. 5 shows a type in which the bar is covered and adhered with insulating film, Figs. 6 and 7 show various cases of jointing in the present invention, Fig. 6 is a longitudinal front view of a case in which bus bars are joined to both sides of an insulating plate, and Fig. 7 is a longitudinal front view of a case in which protrusions are elevated above the insulating plate and deformed. 1... bus bar, 2... insulating plate, 3... joint between bus bar and insulating plate, 4... terminal, 5... projection, 6... hole, 7...
...electric wire, 8...joint, 9...insulating film.

Claims (1)

[Correction Description] [Utility Model Claims] [Claim 1] A joint between a busbar for a joint box and an insulating plate, formed by providing a busbar serving as an electric conductor with a bent protrusion protruding from an edge of the busbar, inserting the protrusion into a hole provided in the insulating plate, and joining the busbar and the insulating plate with a snap fit. Claim 2] A joint between a busbar for a joint box and an insulating plate as set forth in utility model claim 1, in which the busbar is joined to both sides of the insulating plate. Claim 3] A joint between a busbar for a joint box and an insulating plate as set forth in utility model claim 1, in which the protrusion of the busbar that is inserted into a hole in the insulating plate and protruding from the surface of the insulating plate is stress-deformed to provide an undercut. Claim 4] A joint between a busbar for a joint box and an insulating plate as set forth in utility model claim 1, 2 or 3, in which the protrusion is inserted into the hole at two or more points. [Claim 5] A joint between a busbar for a joint box and an insulating plate as set forth in utility model claim 1, 2, 3 or 4, in which the hole shape and the protrusion shape are similar. [Claim 6] A joint between a busbar for a joint box and an insulating plate as set forth in utility model claim 1, 2, 3 or 4, in which the hole shape and the protrusion shape are not similar.