JPH04337269A - Multi-wire bundle sliding contact - Google Patents

Abstract

PURPOSE:To improve the contact reliability by staggeringly welding sliding brushes each fitted with the base end section of a wire bundle collected with brush wires in parallel in advance to a spacer and molded with a contact section at the tip section to both the front and rear faces of the tip section of a spring material. CONSTITUTION:The base end section of a wire bundle aligned and collected with ten brush wires in parallel is welded to the projection 4 of a spacer 3 with the thickness 0.2mm. A sliding brush 6' bent and molded with a circular arc-shaped contact section 5 with the radius of curvature 2mm is formed at the tip section. A sliding brush 6 bent with a circular arc-shaped contact section 5' with the radius of curvature lmm is formed at the tip section of the wire bundle welded with the base end to the projection 4 of the spacer 3. The brushes 6', 6 are resistance-welded on both the surface and rear faces of the tip section of a spring material 7 made of phosphor bronze and having the thickness 0.2mm while the welded positions are longitudinally displaced by 0.5mm to obtain a multi-wire bundle sliding contact 8'. The number of brush wires is doubled without increasing the plane area, multi-point contact is further obtained, and the change of resistance is stabilized low.

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

[Prior Art] As shown in FIG. 7, a conventional multi-wire bundle sliding contact is made by welding the base end of a wire bundle 2, which is made by aligning and converging brush wires 1 in parallel, to the projection 4 of a spacer 3, and having the tip end shaped like an arc. The sliding brush 6 formed by molding the contact portion 5 of the spring material 7
It is welded to the surface of the tip.

By the way, the area of the multi-wire bundle sliding contact 8 constructed as described above increases when the number of brush wires 1 is increased to improve contact reliability.

On the other hand, with the recent increase in the density and precision of electrical equipment, there is a demand for multi-wire bundle sliding contacts that can further improve contact reliability within a limited space.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to increase the number of brush wire rods without increasing the flat surface area, thereby improving contact reliability, and to manufacture a multi-layer wire rod that can be manufactured using current manufacturing equipment as is. It is intended to provide a wire bundle sliding contact.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the multi-wire bundle sliding contact of the present invention has a base end of a wire bundle in which brush wires are aligned and bundled in parallel in advance on both the front and back surfaces of the tip end of a spring material. It is made by welding a sliding brush that is attached to a spacer and has a contact part formed at its tip, with the welding position shifted.

[0007]

[Function] In the multi-wire bundle sliding contact of the present invention constructed as described above, the number of brush wires is doubled and contact is made at even more points, so that the contact reliability is improved. Furthermore, since the welding positions of the sliding brushes on both the front and back surfaces of the tip of the spring material are shifted, the influence of heat on the spring material can be substantially suppressed. Furthermore, since the sliding brushes on the front side and the sliding brushes on the back side have different contact pressures, they can accommodate a wide range of sliding conditions.

[0008]

[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 Fig. 1, the wire diameter is 0.08 mm, Ag30%-Pd35%-Au10%-Pt10%-C.
A spacer 3 made of 30% CuNi with a thickness of 0.2 mm, a width of 1.0 mm, and a length of 1.2 mm is attached to the base end of a wire bundle 2 in which 10 brush wires 1 made of u14%-Zn1% are arranged and condensed in parallel. Projection (width 0.15mm
A sliding brush 6' is shown in FIG. As shown in FIG. 3, a sliding brush 6 is formed by bending and forming an arc-shaped contact portion 5' with a radius of curvature of 1 mm on the tip of the wire bundle 2 whose base end is welded to the projection 4 of the spacer 3. Sa 0
．． The welding position is made in the front and back direction on both the front and back sides of the tip of the spring material 7 made of phosphor bronze, which is 2 mm in width, 1.2 mm in width, and 5 mm in length.
Resistance welding is performed with a shift of 0.5 mm to form a multi-wire bundle sliding contact 8'.

On the other hand, the conventional multi-wire bundle sliding contact is made of 30% Ag-35% Pd-A with a wire diameter of 0.08 mm, as shown in FIG.
The base end of a wire bundle 2 made by aligning and converging brush wires 1 made of u10%-Pt10%-Cu14%-Zn1% in parallel is made of 30% CuNi with a thickness of 0.2 mm, a width of 1.0 mm, and a length of 1.2 mm. A slide formed by welding a projection 4 of a spacer 3 (a linear protrusion with a semicircular cross section with a width of 0.15 mm and a height of 0.05 mm) and bending an arc-shaped contact portion 5 with a radius of curvature of 2 mm at the tip. Thickness of dynamic brush 6 is 0
．． A multi-wire bundle sliding contact 8 is constructed by resistance welding to the front end surface of a spring material 7 made of phosphor bronze with a width of 2 mm, a width of 1.2 mm, and a length of 5 mm.

[0010] The multi-wire bundle sliding contacts of the embodiment and the conventional example having the above configuration 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 test conditions were applied. A sliding test was conducted at
When the rate of change in circuit resistance was measured, 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 :
300 hours

0012

[Table 1]

As is clear from Table 1 above, the multi-wire bundle sliding contact of the conventional example has a high rate of change in circuit resistance before and after the test, whereas the multi-wire bundle sliding contact of the embodiment has a high rate of change in circuit resistance before and after the test. It can be seen that the rate of change in circuit resistance after the test is low and stable. This is simply because the multi-wire bundle sliding contact of the present invention doubles the number of brush wires 1 within the same plane area, resulting in even more multi-point contact.

The multi-wire bundle sliding contact 8' of the above embodiment is as follows:
Sliding brushes 6', 6 having arc-shaped contact portions 5, 5' are welded to both the front and back surfaces of the tip end of the spring material 7, as shown in FIG.
As shown in FIG.
, 9' may be used as a multi-wire bundle sliding contact 11, in which sliding brushes 10, 10' having brushes 10 and 9' are welded to both the front and back surfaces of the tip of the spring member 7. Further, as shown in FIG. 5, a sliding brush 6 having an arcuate contact portion 5 and a sliding brush 10′ having a contact portion 9′ bent at right angles.
The multi-wire bundle sliding contact 12 may be welded to both the front and back surfaces of the tip of the spring material 7, and as shown in FIG.
A multi-wire bundle sliding contact 13 may also be used, in which a sliding brush 6' having a structure is welded to both the front and back surfaces of the tip of the spring member 7.

[0015]

[Effects of the Invention] As described above, the multi-wire bundle sliding contact of the present invention has the following features:
The number of brush wires is doubled without increasing the planar area, resulting in even more multi-point contact, resulting in a low and stable rate of change in circuit resistance, and high contact reliability. In addition, since the contact pressure between the sliding brush on the front side and the sliding brush on the back side is different, it can correspond to a wide range of sliding conditions, and by changing the contact position by appropriately selecting the mounting position of the sliding brush on both the front and back sides. , it is possible to extract more signals. Furthermore, since the multi-wire bundle sliding contact of the present invention has sliding brushes welded to both the front and back surfaces of the tip of the spring material in shifted positions, it can be manufactured using existing manufacturing equipment as is.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a sliding brush in an embodiment of the multi-wire bundle sliding contact of the present invention.

FIG. 2 is a diagram showing a sliding brush in an embodiment of the multi-wire bundle sliding contact of the present invention.

FIG. 3 is a diagram showing an embodiment of the multi-wire bundle sliding contact of the present invention.

FIG. 4 is a diagram showing various other embodiments of the multi-wire bundle sliding contact of the present invention.

FIG. 5 is a diagram showing various other embodiments of the multi-wire bundle sliding contact of the present invention.

FIG. 6 is a diagram showing various other embodiments of the multi-wire bundle sliding contact of the present invention.

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

[Explanation of symbols]

1 Brush wire material 2. Line bundle 3 Spacer 4. Projection 5, 5' Contact part 6, 6' sliding brush 7 Spring material 8' Multi-wire bundle sliding contact 9, 9' Contact part 10, 10' Sliding brush 11, 12, 13 Multi-wire bundle sliding contact

Claims (1)

[Claims] Claim 1: A sliding brush is provided on both the front and back sides of the tip of a spring material by attaching the base end of a bundle of brush wires arranged in parallel and converging to a spacer and forming a contact part on the tip. A multi-wire bundle sliding contact made by staggered welding.