JPH062244Y2 - Electric resistance element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a resistance element of an electric resistor used in a vehicle, a crane or the like.

[Conventional technology]

As shown in FIG. 7, a conventional resistance element of an electric resistor used in a vehicle, a crane or the like has a slanted bending portion which is bent at opposite ends of a body portion 1 made of a strip-shaped resistance material. 2 is formed, and a joint portion 3 parallel to the main body portion 1 is formed at the tip of the bent portion 2.

As shown in FIG. 8, the electric resistance element 4 has a resistor body 5 connected in a zigzag shape by abutting and joining the joint portions 3 of a large number of electric resistance elements 4 having the same shape.
Make up. Each joint 3 of the resistor 5 is fitted into a holding groove 7 of a rod-shaped porcelain comb-shaped insulator 6. Resistor 5 above
As shown in FIG. 9, the insulator 6 is stacked in several stages, and is fixed to a frame (not shown) by a support shaft 8 passing through the inside of the insulator 6 to form one resistor.

[Problems to be solved by the device]

Retaining groove 7 of insulator 6 for supporting joint 3 of resistor 5
A clearance a is provided between the inner end of the resistor 5 and the inclined bent portion 2 of the resistor 5, and the clearance a absorbs the amount of thermal expansion of the resistor 5 during heat generation. Therefore, rattling is likely to occur at room temperature,
When the electric resistance element is further deformed, the resistor 5 becomes
May fall out of.

Further, when the resistor 5 is cooled by using a blower, the joint 3 is behind the insulator 6 and the wind is hard to hit, so that there is a problem that local temperature rise occurs.

Then, this invention makes it a technical subject to solve these problems.

[Means for Solving the Problems]

A first means for solving the above-mentioned problem is to form inclined bent portions bent at opposite sides at both ends of a main body portion made of a strip-shaped resistance material, and the main body portion is provided at the tip of the bent portion. In the electric resistance element formed by forming parallel joints, bent portions bent in opposite directions are formed at the tips of the joints.

The second means forms an inclined bent portion at one end of a main body portion made of a strip-shaped resistance material, forms a joint portion parallel to the main body portion at the tip of the bent portion, and forms the joint portion at the other end of the main body portion. In an electric resistance element formed by extending a main body portion to form another joint, a bent portion bent in the opposite direction is formed at the tip of each joint described above.

[Action]

Each of the electric resistance elements according to the first means and the second means described above is joined at a required number of joints at both ends to form a zigzag resistor.

When each joint of the resistor is fitted in the holding groove of the insulator, the bent portion engages with the outer side surface of the insulator to stabilize the resistor. Further, when wind blows on the bent portion, it acts as a heat radiating fin to mitigate local temperature rise of the joint portion.

〔Example〕

FIG. 1 shows an electric resistance element of the embodiment. This resistance element 1
0 is a strip-shaped resistance material made of nichrome, iron chrome, etc., which is press-formed as in the conventional case, and the main body 1
The inclined bent portions 12 having different bending directions are formed at both ends of the inclined portion 1, and the joint portion 13 parallel to the main body portion 11 is formed at the tip of the inclined bent portion 12. In addition, the bent portions 15 that are bent at right angles to the inclined bent portion 12 side at the tips of the joint portions 13, respectively.
To form.

As shown in FIG. 3, the length of the above-mentioned joining portion 13 is the insulator 6
When it is inserted into the holding groove 7, the length is set to have a clearance a for absorbing thermal expansion with the inner end of the holding groove 7.

The electric resistance element 10 having the above-described structure has the joint portion 13 at one end thereof.
The joint portion 1 of the electric resistance element 10 having another similar structure on one side of the
A zigzag-shaped resistor 16 is formed by joining a required number of 3 by electric resistance welding (see FIG. 2). In this resistor 16, each joint 13 is fitted in the holding groove 7 of the insulator 6, and if necessary, the resistors 16 are stacked in several stages as shown in FIG. 4, and the support shaft 8 of each insulator 6 is attached. One resistor is constructed by fixing it to the frame.

In the resistor thus configured, the bent portions 15 at both ends of each resistance element 10 have insulators 6 as shown in FIG.
The outer surface of the insulator 6 is engaged with the outer surface of the insulator 6.
A clearance a is generated between the inner end of the holding groove 7 and the inclined bent portion 12, but since the bent portion 15 is engaged with the outer surface of the insulator 6, the resistor 16 is fitted in the holding groove 7 of the insulator 6. Supported without rattling.

Further, since the bent portion 15 increases the volume of the resistor 16 in the joint portion 13 which is apt to cause local temperature rise,
The heat capacity increases. In addition, the bent portion 15 acts as a heat radiation fin and promotes cooling of the joint portion 13. Further, since each bent portion 15 blocks a part of the cooling air that passes between the upper and lower insulators 6 and flows out to the outside, the cooling air can be effectively used.

FIG. 5 shows another embodiment of the electric resistance element 10 '.
Forms a slanted bent portion 12, a joint portion 13 and a bent portion 15 similar to the above only on one end of the main body portion 11, and extends the main body portion 11 at the other end to form a joint portion 13. The bent portion 15 bent in the opposite direction to the bent portion 15 is formed at the tip of the joint portion 13. As shown in FIG. 6, the electric resistance elements 10 'are formed by sequentially arranging those having the same shape in the opposite directions, and adjoining the adjacent joint portions 13 to be integrated. The resistor 16 'constructed in this way also has the same operation as that of the above-mentioned embodiment.

[Effect of device]

As described above, the electric resistance element of the present invention, when assembled as a resistor and supported by the insulator, since the bent portion engages with the outer surface of the insulator, the resistor is supported without rattling,
Further, there is an effect that there is no fear of falling off. Further, since the bent portions at both ends increase the heat capacity of the joint portion and act as a radiation fin, they are effective in mitigating local temperature rise in the joint portion.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of an electric resistance element, FIG. 2 is an exploded perspective view of a resistor using the above resistance element, FIG. 3 is a plan view showing a part of the same, and FIG. 5 is a sectional view showing a part of FIG. 5, FIG. 5 is a perspective view of another embodiment of the electric resistance element, FIG.
The figure is a schematic plan view of a resistor using the above resistance element,
FIG. 8 is a perspective view of a conventional example of an electric resistance element, FIG. 8 is a partially omitted plan view of a resistor using the electric resistance element, and FIG. 9 is a sectional view showing a part of the same. DESCRIPTION OF SYMBOLS 1 ... Main body part, 2 ... Inclined bending part, 3 ... Joining part, 4 ... Electric resistance element, 5 ... Resistor, 6 ... Insulator, 7 ... Holding groove, 8 ... Support shaft, 10 , 10 '... Electric resistance element, 11 ... Main body part, 12 ... Inclined bent part, 13 ... Joined part, 15 ... Bent part, 16, 16' ... Resistor.

Claims (2)

[Scope of utility model registration request] 1. A slanted bent portion, which is bent to the opposite side, is formed at both ends of a body portion made of a strip-shaped resistance material,
In an electric resistance element in which a joint portion parallel to the main body portion is formed at the tip of the bent portion, an electric resistance characterized in that bent portions bent in opposite directions are formed at the tip of each of the above joint portions. element. 2. An inclined bent portion is formed at one end of a body portion made of a strip-shaped resistance material, a joint portion parallel to the body portion is formed at the tip of the bent portion, and a body portion is formed at the other end of the body portion. In an electric resistance element formed by extending and forming another joint,
An electric resistance element, characterized in that bent portions that are bent in opposite directions are formed at the tips of the respective joint portions.