JPH04332488A - Multiple wire bundle slide contact - Google Patents

Abstract

PURPOSE:To absorb vibration at the time of getting in contact, so as to stabilize the contact by collecting brush wire materials having arclike contact parts on forward end parts and brush wire materials having perpendicularly bent contact parts on forward end parts alternately in parallel to form a contact. CONSTITUTION:Plural brush wire materials 2 having arclike contact parts 1 on forward end parts, and plural brush wire materials 7 of the same wire diameter and material having perpendicularly bent contact parts 6 on forward end parts are aligned alternately in parallel to be collected to form a wire bundle 11. The base end part of the wire bundle 11 is welded to the surface at the forward end part of a spring member 12 made of phosphor bronze so as to form a multiple wire bundle slide contact 13. This contact 13 absorbs and damps vibration at the time of getting in contact by the wire materials having the arc-like contact parts and stabilizes the contact. A contact surface at the time of getting in contact is stabilized by the wire materials having the perpendicularly bent contact parts, so that frictional wear on the arc-like contact parts is restricted, thereby a contact resistance is stablized.

Description

[Detailed description of the invention]

0001

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

0002

2. Description of the Related Art As shown in FIG. 6, a conventional multi-wire bundle sliding contact has a wire bundle 3 in which brush wires 2 having arc-shaped contact portions 1 at their tips are aligned and focused in parallel. a multi-wire bundle sliding contact 5 welded to the front end surface of the spring material 4;
As shown in FIG. 7, a wire bundle 8 in which brush wires 7 having contact portions 6 bent at right angles at their tips are aligned and focused in parallel is welded to the tip surface of a spring material 9 at its base end. There is a wire bundle sliding contact 10.

By the way, in the former multi-wire bundle sliding contact 5, since the contact portion 1 is arc-shaped, the contact surface wears out with use.
As the contact area increases, more abrasion powder is generated, the contact resistance changes and increases, and contact failure occurs. Furthermore, in the latter multi-wire bundle sliding contact 10, there is a difference in spring properties between forward and backward sliding motions of the rotary board, and vibrations cannot be absorbed, resulting in unstable contact. As a result, there has been a problem in that the rate of change in circuit resistance during use becomes significantly high.

0004

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a multi-wire bundle sliding contact that compensates for the drawbacks of the above-mentioned multi-wire bundle sliding contacts and takes advantage of the mutual features.

[0005]

[Means for Solving the Problems] A multi-wire bundle sliding contact of the present invention for solving the above problems has a brush wire having an arcuate contact portion at the tip and a contact portion bent at right angles to the tip. A wire bundle in which the brush wires are aligned and focused in parallel is welded at its base end to the surface of the tip end of the spring material.

[0006] In this multi-wire bundle sliding contact, the wire bundle is made up of a brush wire having an arcuate contact portion at the tip and a brush wire having a contact portion bent at right angles to the tip, which are aligned and focused alternately in parallel. A wire group in which brush wires having arc-shaped contact portions at their tips are arranged in parallel, and a wire group in which brush wires having contact portions bent at right angles at their tips are arranged in parallel are converged in parallel. There are things that have been done.

[0007]

[Operation] The multi-wire bundle sliding contact of the present invention constructed as described above can absorb and alleviate vibrations at the time of contact by the brush wire having the arcuate contact portion. That is, since it has spring properties, it can follow the forward and backward sliding movements of the rotary substrate, and the contact is stable. In addition, the brush wire having a contact part bent at right angles makes the contact surface constant during contact, suppresses wear of the arc-shaped contact part, and stabilizes contact resistance.
The occurrence of contact failure can be suppressed. Therefore, the rate of change in circuit resistance during use is low and stable.

[0008] In a multi-wire bundle sliding contact in which brush wires having arcuate contact portions and brush wires having perpendicularly bent contact portions are aligned and bundled alternately, there is a gap between the contact portions. The formed gap is effectively utilized to prevent abrasion powder and foreign matter from being drawn in.

[0009] Furthermore, there is a multi-wire bundle in which a wire group in which brush wires having arc-shaped contact portions are arranged in parallel and a wire group in which brush wires having contact portions bent at right angles are arranged in parallel are bundled in parallel. In the case of a moving contact, it is possible to absorb and alleviate differences in wear due to differences in circumferential speed during rotation of the rotary substrate, and furthermore, it is possible to prevent outward deformation due to centrifugal force.

0010

[Embodiment] An embodiment of the multi-wire bundle sliding contact of the present invention will be explained with reference to the drawings. As shown in FIGS. 1 and 2, the wire diameter is 0.0
8mm, length 3mm Ag30%-Pd35%-Au1
Five brush wire rods 2 made of 0%-Pt10%-Cu14%-Zn1% have an arcuate contact portion 1 with a radius of curvature of 2 mm and a height of 2 mm at the tip, and a brush wire 7 of the same wire diameter and material. A contact portion 6 with a height of 2 mm bent at right angles to the tip of the
A wire bundle 11 in which five wires having a diameter of 1.5 cm and 5 wires are aligned and focused in parallel alternately has a thickness of 0.1 mm and a width of 1.2 mm at its base end.
A multi-wire bundle sliding contact 13 is constructed by welding to the front end surface of a spring member 12 made of phosphor bronze and having a length of 5 mm.

On the other hand, one of the conventional multi-wire bundle sliding contacts is shown in FIG.
As shown in the figure, the tip has an arc-shaped contact part 1 with a radius of curvature of 2 mm and a height of 2 mm.Ag30%-Pd35%-Au
A wire bundle 3 made of 10 brush wires 2 made of 10%-Pt10%-Cu14%-Zn1% and having a length of 3 mm and a wire diameter of 0.08 mm is bundled in parallel and has a thickness of 0.1 m at its base end.
A multi-wire bundle sliding contact 5 is constructed by welding to the tip surface of a spring material 4 made of phosphor bronze having a width of 1.2 mm and a length of 5 mm.

Another conventional multi-wire bundle sliding contact is shown in FIG.
30% Ag-35% Pd-10% Au-P having a contact part 6 with a height of 2 mm bent at right angles to the tip as shown in FIG.
A length of 3 mm made of t10%-Cu14%-Zn1%,
A wire bundle 8 in which 10 brush wire rods 7 with a wire diameter of 0.08 mm are aligned and bundled in parallel forms a spring material 9 made of phosphor bronze with 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 10 is constructed by welding to the front end surface of the wire.

The multi-wire bundle sliding contacts of the above-mentioned embodiment and conventional examples 1 and 2 were placed in opposing contact with a rotating substrate made of carbon/ceramics (Al2O3) with an outer diameter of 20 mm and a thickness of 1.5 mm, and the following procedure was carried out. A sliding test was conducted under the following test conditions, and the rate of change in circuit resistance was measured, and the results shown in Table 1 below were obtained.

Test conditions Contact pressure: 10g Sliding speed (reciprocation): 3 reciprocations/second Current
: 2mA voltage
: 5V sliding time : 3
00 hours

[0015]

[Table 1]

As is clear from Table 1 above, conventional examples 1 and 2
The multi-wire bundle sliding contact has a high circuit resistance change rate before and after the test, whereas the multi-wire bundle sliding contact of the example has a low and stable circuit resistance change rate before and after the test. I understand that. This is because the multi-wire bundle sliding contact of the present invention can absorb and alleviate vibrations during contact by the brush wire 2 having the arc-shaped contact portion 1, and the contact is stable. This is because the brush wire 7 having the section 6 makes the contact surface constant, suppressing wear of the arc-shaped contact section 1, suppressing contact resistance, and suppressing the occurrence of contact failure.

The multi-wire bundle sliding contact 13 of the above embodiment is as follows:
Although the contact positions of the arc-shaped contact part 1 and the contact part 6 bent at right angles are shifted back and forth, as shown in FIG.
The contact positions may be made to match in the front-rear direction so that they are lined up in a straight line in the lateral direction. Further, as shown in FIG. 4, a wire group 1 in which brush wires 2 having arc-shaped contact portions 1 are arranged in parallel.
4 and a group of wire rods 15 in which brush wire rods 7 having contact portions 6 bent at right angles are arranged in parallel may be bundled in parallel. In this case, the contact positions of the contact part 1 and the contact part 6 are shifted back and forth, but as shown in FIG. It is a good thing to do.

In the case of the multi-wire bundle sliding contacts shown in FIGS. 4 and 5, it is possible to absorb and alleviate the wear difference caused by the difference in circumferential speed during the rotation of the rotating substrates in opposing contact, and also to prevent outward deformation due to centrifugal force. It can be prevented.

[0019]

[Effects of the Invention] As described above, the multi-wire bundle sliding contact of the present invention has the following features:
Vibration during contact with the rotating substrate can be absorbed and alleviated, resulting in stable contact. In addition, the contact surface at the time of contact is constant,
Wear of the contact portion can be suppressed, contact resistance can be kept low, and occurrence of contact failure can be suppressed. As a result, the rate of change in circuit resistance during use is low and stable. In addition, in multi-wire bundle sliding contacts, which have arc-shaped contact parts and contact parts bent at right angles, the gaps formed between the contact parts are effectively utilized to prevent wear particles and foreign matter from being entrained. be done. In addition, in a multi-wire bundle sliding contact in which a wire bundle of brush wire rods having an arc-shaped contact portion and a wire bundle of brush wire rods having a contact portion bent at right angles are converged next to each other, the difference in circumferential speed during rotation of the rotating board It can absorb and alleviate the difference in wear, and also prevent outward deformation due to centrifugal force.

[Brief explanation of drawings]

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

FIG. 2 is a plan view of the multi-wire bundle sliding contact of FIG. 1;

FIG. 3 is a side view showing a partially modified example of the multi-wire bundle sliding contact in FIG. 1;

FIG. 4 is a plan view of another embodiment of the multi-wire bundle sliding contact of the present invention.

FIG. 5 is a plan view showing a partially modified example of the multi-wire bundle sliding contact in FIG. 4;

FIG. 6 is a perspective view showing an example of a conventional multi-wire bundle sliding contact.

FIG. 7 is a perspective view showing another example of a conventional multi-wire bundle sliding contact.

[Explanation of symbols]

1 Arc-shaped contact portion 2 Brush wire rod 6 having an arc-shaped contact portion Contact portion 7 bent at a right angle Brush wire rod 11 having a contact portion bent at a right angle
Wire bundle 12 in which brush wire rods 2 and 7 are aligned and bundled alternately Spring material 13 Multi-wire bundle sliding contact 14 Wire group 15 of brush wire rod 2 Wire rod group of brush wire rod 7

Claims (3)

[Claims] Claim 1: A wire bundle in which a brush wire having an arc-shaped contact portion at the tip and a brush wire having a contact portion bent at right angles at the tip are aligned and focused in parallel is connected to a spring material at its base end. A multi-wire bundle sliding contact that is welded to the surface of the tip. 2. In the multi-wire bundle sliding contact according to claim 1, the wire bundle includes a brush wire having an arcuate contact portion at the tip thereof and a brush wire having a contact portion bent at right angles at the tip thereof alternately parallel to each other. A multi-wire bundle sliding contact characterized by being aligned and focused. 3. In the multi-wire bundle sliding contact according to claim 1, the wire bundle has a group of brush wires arranged in parallel, each having an arcuate contact portion at the tip, and a contact portion bent at right angles to the tip. A multi-wire bundle sliding contact, characterized in that a group of wire rods in which brush wire rods are arranged in parallel are bundled in parallel.