JPH0510322Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Field of Industrial Application The present invention relates to an electrical resistor with a relatively low resistance value that connects between a power source and an electrical load.

(2) Prior Art It is conventionally known to install the electrical resistor described above in a fuse box.

(3) Problems to be solved by the invention In the above-mentioned conventional electrical resistors, the resistance value is relatively low due to dimensional errors during molding, variations in plating thickness, etc., especially when the resistance value is relatively low. There was a risk that large variations would occur.

This invention was proposed in view of the above, and even if variations in resistance value occur during the manufacturing process, it can be easily adjusted after the fact, and the set resistance can be adjusted according to the applicable fuse box model and application. It is an object of the present invention to provide an electric resistor that can contribute to cost reduction by using common resistance members even when manufacturing a plurality of types of electric resistors having different values.

B. Structure of the invention (1) Means for solving the problem In order to achieve the above object, the present invention uses a conductive material in the electrical resistor that is installed in the fuse box and connects between the power supply and the electrical load. A resistance member made of a plate material and having a plurality of resistance adjustment holes bored in its intermediate portion; and a resistance member that is screwed into any one of the plurality of resistance adjustment holes to adjust the resistance value of the resistance member. The screw member is characterized in that the screw member has a head having a larger diameter than the hole and is made of a conductive material.

(2) Effect The resistance value of an electrical resistor can be changed as appropriate over a wide adjustment range by simply screwing a screw member as a conductive member into any one of the plurality of resistance adjustment holes. Even if variations occur in the resistance value during the manufacturing process of the member, it is extremely easy to adjust the resistance value, and the resistance member can be used in common even when a plurality of types of electrical resistors with different set resistance values are manufactured.

In particular, by adopting the screw member as the conductive member, the workability of attaching and removing the resistor member is extremely good, and the variation in the resistance value of the conductive member itself is extremely small, and furthermore, the resistor member is free from vibrations. Even if the conductive member is thermally deformed, it will not accidentally fall off, and furthermore, the necessary attachment strength to the resistance member can be ensured regardless of the material. Additionally, if the resistance value increases due to rust due to long-term use, the resistance value can be readjusted extremely easily by screwing a new screw member into the unused hole. Furthermore, the special provision of the large-diameter head of the screw member increases the substantial heat dissipation area of the resistance member.

(3) Embodiments Hereinafter, an embodiment in which the present invention is applied to an electric resistor built in a fuse box interposed between an automobile battery and a load will be described with reference to the drawings. In Figure 1, fuse box 1
consists of a box-shaped main body 2 and a cover (not shown) that covers the opening of the main body 2. Inside the main body 2, there are a power supply connection terminal board 3 for connecting to a battery (not shown) as a power source, and two load connection terminal boards 4 for individually connecting to a plurality of electrical loads (not shown), for example, two electrical loads. 5 are fixed and arranged parallel to each other. Furthermore, on one side of the main body 2 (the right side in FIG. 1), there is an opening 6 for connecting the cord to the power supply connection terminal plate 3, and on the other side of the main body 2 (the left side in FIG. 1), Each load connection terminal plate 4, 5 is provided with an opening 7, 8 for connecting a cord, respectively.

The power supply connection terminal plate 3 and the mounting plate 19 fixed to the other side of the main body 2 are connected by a first fuse 9, and the two load connection terminal plates 4 and 5 are connected to each other by a first fuse 9.
and a common mounting plate 20 fixed to one side of the main body 2.
are connected by two second fuses 10 and 11, respectively. Moreover, those fuses 9,
10 and 11 are arranged parallel to each other.

Between the mounting plate 19 and the common mounting plate 20, there is a second
As shown in the figure, a bus bar 21 as a resistance member having a bent shape is arranged. One end of this bus bar 21 is held between the mounting plate 19 and the main body 2 by screwing the mounting plate 19 onto the main body 2, and the other end of the bus bar 21 is held between the mounting plate 19 and the main body 2.
0 to the main body 2, the common mounting plate 20
and the main body 2. Therefore, the mounting plate 19 and the common mounting plate 20 are connected via the bus bar 21.

Terminals 15 and 16 are connected to the middle of the bus bar 21, respectively. That is, both the terminals 15 and 16 are screwed onto the main body 2 and are pressed into contact with the bus bar 21. By connecting a voltmeter or the like between these terminals 15 and 16, the bus bar 21 functions as a so-called shunt resistor, and the load current can be easily detected based on the amount of voltage drop across the bus bar 21 between the terminals 15 and 16. be able to.

By the way, when the bus bar 21 is used as a resistor with a relatively low resistance value, the resistance value depends on the conductivity of the metal, the cross-sectional area, and the terminals 15, 1.
6, so if the bus bar 21 is accurately cut out, variations in resistance value can be suppressed as much as possible. However, due to the fact that the resistance value is actually low, there are dimensional errors during die cutting and variations in plating thickness, so it is inevitable that the resistance value will vary between different manufacturing lots. Therefore, means for easily adjusting the resistance value is specially provided on the bus bar 21 as will be described below.

That is, a plurality of resistance adjustment holes 23 are formed at predetermined intervals between the connection positions of the terminals 15 and 16 of the bus bar 21. By screwing a screw member 24 made of a conductive metal into at least one of these holes 23, the hole 23 is filled with a conductive material and the resistance value of the bus bar 21 is decreased. Can be easily adjusted. The screw member 24 has a circular head 24a having a larger diameter than the resistance adjustment hole 23, and a tool can be engaged with the outer surface of the head 24a when rotating the screw member 24. A cross-shaped tool engagement hole is provided in the recess.

The bus bar 21 as a resistance member,
The screw member 24 constitutes the electrical resistor R of the present invention.

C. Effects of the invention As described above, according to the invention, in the electrical resistor that is installed in the fuse box and connects the power source and the electrical load, the electrical resistor is made of a conductive plate and has multiple resistance adjustment units in the middle. The electrical resistor is equipped with a resistance member in which a hole is formed, and a conductive member that is filled into any one of the plurality of resistance adjustment holes so as to adjust the resistance value of the resistance member. By simply blocking any of the multiple resistance adjustment holes with a conductive member, the resistance value can be changed as appropriate over a wide adjustment range. Therefore, variations in resistance value occur during the manufacturing process of the resistance member. Even if the adjustment can be easily made after the fact, and even if multiple types of electrical resistors with different set resistance values are manufactured depending on the applicable fuse box model or application, the resistor member itself is common. It can be used for a variety of purposes, and is therefore superior in mass productivity and can contribute to cost reduction. Further, since holes are formed in the resistance member instead of notches for resistance adjustment, a decrease in strength of the resistance member can be suppressed as much as possible.

In particular, as the conductive member, a screw member having a head diameter larger than that of the resistance adjustment hole and screwed into the hole is used, so a conductive paint or conductive adhesive is used. Compared to the structure that closes the hole,
The workability of attaching and detaching the resistive member is very good, and there is very little variation in the resistance value of the conductive member itself, making it possible to set the resistance value of the resistive member accurately and accurately. There is no risk of the conductive member accidentally falling off even if it is deformed, and the necessary mounting strength for the resistance member can be secured regardless of the material, which increases the freedom of material selection. Optimum material selection can be made by taking into account the galvanic corrosion resistance between By screwing together the screw members,
You can also adjust the resistance value very easily.
Furthermore, the special provision of the large-diameter head of the screw member increases the substantial heat dissipation area of the resistance member, which is effective in preventing overheating of the resistance member and the members directly in contact with it.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a fuse box, and FIG. 2 is a perspective view of an embodiment of a bus bar as an electrical resistor. DESCRIPTION OF SYMBOLS 1... Fuse box, 21... Bus bar as a resistance member, 23... Resistance adjustment hole, 24...
...screw member, R...electrical resistor.

Claims (1)

[Scope of utility model registration request] In an electrical resistor installed in the fuse box 1 to connect between a power source and an electrical load, a resistor member 21 made of a conductive plate material and having a plurality of resistance adjustment holes 23 bored in the middle part; The screw member 24 is screwed into any one of the plurality of resistance adjustment holes 23 to adjust the resistance value of the resistance member 21, and the screw member 24 has a diameter larger than that of the hole 23. An electrical resistor characterized in that it has a head portion 24a and is made of a conductive material.