JPH05190241A - Multiwire bundle sliding contact - Google Patents

Abstract

PURPOSE:To suppress generation of a contact obstacle by welding a multiwire bundle, provided with a contact part of flexing the point end part in a shape at a right angle and a circular arc-shaped contact part, to the point end of a spring material. CONSTITUTION:A multiwire bundle 4 is formed by collectively bundling five brush wire rods, straightened, of 0.08mm wire diameter consisting of 30% Ag-35% Pd-10% Au-10% Pt-14% Cu-1% Zn material. A contact part 4b of flexing the point end part in right angular shape to about 2mm height and a circular arc-shaped contact part 4a of 2mm radius of curvature and 2mm height are provided. The contact parts are welded to the point end of a spring material 3 of phosphor bronze with 0.1mm thickness, 1.2mm width, 5mm length in the base end part, to form a multiwire bundle moving contact 5. Vibration at contact time of the circular arc-shaped contact part is absorbed to be relaxed, and a contact surface at contact time of the right angular flexed contact part is fixed to stabilize contact resistance by suppressing wearing in the circular arc-shaped contact part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-wire bundle sliding contact used in encoders, trimmers, variable resistors, sensors and the like.

[0002]

2. Description of the Related Art As a conventional multi-wire-bundle sliding contact, a brush wire having a contact portion 1a in which the tip of the multi-wire bundle 1 is arcuate as shown in FIG. 2 or a tip of the multi-wire bundle 2 as shown in FIG. A brush wire or the like having a contact portion 2b whose portion is bent at a right angle is welded to the tip of the spring material 3.

However, in the above sliding contact, for example, one having an arc-shaped contact portion, the contact portion is worn with use, the contact area is increased and changed, and a large amount of abrasion powder is generated. The resistance began to change and increase, causing contact failure. Further, the one having the contact portion bent at a right angle has a problem that the difference in spring property occurs in the forward and backward sliding movements of the rotating substrate, the vibration cannot be absorbed, and the contact becomes unstable and unstable. there were.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multi-wire-bundle sliding contact that complements the above-mentioned drawbacks of the multi-wire-bundle sliding contact and makes full use of the mutual characteristics.

[0005]

According to the technical means of the present invention for solving the above-mentioned problems, a multi-wire bundle having a contact portion whose tip portion is bent at a right angle and an arc-shaped contact portion is welded to the tip portion of a spring material. It is characterized by being done.

[0006]

In the multi-wire-bundle sliding contact of the present invention constructed as described above, the arc-shaped contact portion can absorb and relax the vibration at the time of contact. That is, since the spring property is excellent, it is possible to follow the forward and backward sliding motions of the rotating substrate, and the contact is stabilized. Also, in the contact portion bent at a right angle, the contact surface at the time of contact becomes constant, and wear of the arc-shaped contact portion can be suppressed,
The contact resistance can be stabilized and the occurrence of contact failure can be suppressed.

[0007]

EXAMPLES Examples and conventional examples will be described below. First, as an example, as shown in FIG. 1, the wire diameter is 0.08 mm and the material is Ag.
30% -Pd 35% -Au 10% -Pt 10% -Cu 14% -Zn
A brush wire made of 1% has a contact portion 4b having a height of 2 mm bent at a right angle and an arc-shaped contact portion 4a having a radius of curvature of 2 mm and a height of 2 mm. The multi-wire bundle 4 has a thickness of 0.1 mm, a width of 1.2 mm, and a length of 5 at its base end.
A multi-wire bundle sliding contact 5 is constructed by welding to the tip of a spring material 3 made of phosphor bronze of mm.

Next, as a conventional example 1, as shown in FIG. 2, a material having an arc-shaped contact portion 1a with a radius of curvature of 2 mm and a height of 2 mm at the tip portion is made of material Ag30% -Pd35% -Au10% -Pt10% -Cu.
A multi-filament bundle 1 made of 14% -Zn1% and having a length of 5 mm and a wire diameter of 0.08 mm, which are aligned and bundled in parallel, has a thickness of 0.1 mm, a width of 1.2 mm, and a length of 5 mm at its base end. The multi-wire bundle sliding contact 6 is formed by welding the tip end of the spring material 3 made of phosphor bronze.

Further, as Conventional Example 2, as shown in FIG. 3, a material having a contact portion 2b having a height of 2 mm and having a tip bent at a right angle, Ag30% -Pd35% -Au10% -Pt10% -Cu14%-
A multi-filament bundle 2 in which 5 brush wire rods made of Zn-1% and having a length of 3 mm and a wire diameter of 0.08 mm are aligned and bundled in parallel has a thickness of 0.1 mm, a width of 1.2 mm, and a length of 5 mm at its base end. A multi-wire bundle sliding contact 7 is formed by welding the tip end of a spring material 3 made of phosphor bronze.

Therefore, the multi-wire bundle sliding contacts of the embodiment, the conventional example 1 and the conventional example 2 are brought into contact with a rotating substrate made of carbon / ceramic (Al ₂ O ₃ ) having an outer diameter of 20 mm and a thickness of 1.5 mm so as to face each other. A sliding test was conducted under the following test conditions and the rate of change in circuit resistance was measured. The results shown in Table 1 below were obtained.

Test conditions Contact pressure: 12 g Sliding speed (reciprocation): 3 reciprocations / sec Current: 3 mA Voltage: 6 V Sliding time: 350 hours

[0012]

[Table 1]

As is clear from Table 1 above, the multi-wire bundle sliding contacts of Conventional Example 1 and Conventional Example 2 have a high rate of change in circuit resistance before and after the test, whereas the multi-wire bundle sliding contact of the Example The contact points are
It can be seen that the rate of change in circuit resistance before and after the test is low and stable.

[0014]

As described above, the multi-wire bundle sliding contact of the present invention is
Vibration at the time of contact with the rotating substrate can be absorbed and relaxed, and the contact becomes stable. Further, the contact surface at the time of contact becomes constant, wear of the contact portion can be suppressed, contact resistance can be suppressed low, and occurrence of contact failure can be suppressed. Therefore, it has an excellent effect that the change rate of the circuit resistance during use is low and can be stabilized.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a multi-wire bundle sliding contact of the present invention.

FIG. 2 is a perspective view showing an example of a conventional multi-wire bundle sliding contact.

FIG. 3 is a perspective view showing another example of a conventional multi-wire bundle sliding contact.

[Explanation of symbols]

 3 Spring material 4 Multi-wire bundle 4a Arc-shaped contact part 4b Right-angled contact part 5 Multi-wire bundle sliding contact

Claims (1)

[Claims] 1. A multi-wire bundle having a contact portion having a tip portion bent at a right angle and an arc-shaped contact portion is further welded to the tip portion of a spring material at its base end portion. Wire bundle sliding contact.