JPH05315101A - Sliding contact - Google Patents

Abstract

PURPOSE:To enable stable contact and suppress the occurrence of abrasive powder and elongate the life by constituting it of a plate-shaped brush and a linear brush welded to the handle of the plate-shaped brush. CONSTITUTION:A comb teeth and slits bent downward in L shape are made at the half of one side piece by punching and besides, molding a metallic band material by a press. Furthermore, a projection is provided in the vicinity of a cut, and a calked hole too is provided. Next, a line bundle 20 being made by drawing up and converging line materials is fixed to the projection by welding. After cutting into a certain length, a contact 19 is made by bending the top of the line bundle 20 in L shape, and this is made a linear brush 20, thus a sliding contact 21 is gotten. Hereby, the contact becomes stable without the brush being deformed at rotational sliding or dispersed, and the occurrence of abrasive powder is little, and the life elongates.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding contact used for an encoder, a trimmer, a potentiometer, a sensor and the like, and particularly for contacting a substrate.

[0002]

2. Description of the Related Art Generally, a conventional sliding contact is formed by welding a wire bundle 2 in which a large number of extremely fine brush wires 1 are aligned and focused in parallel to each other, as shown in FIG. There are many linear brushes 5. When this linear brush 5 is used in contact with a substrate, the linear brush 5 is extremely small, so that an excessive contact force is generated due to a subtle difference in mounting. In that case, the wire bundle 2 of the brush wire 1 is deformed. Frequently, there was a tendency to come off or come apart, resulting in unstable contact and a large amount of abrasion powder. In addition, the contact life was short.

[0003]

SUMMARY OF THE INVENTION Therefore, according to the present invention, even if a substrate is brought into contact with and slides, it is not deformed or dissipated, and it is possible to make a stable contact and suppress generation of abrasion powder. Moreover, it is intended to provide a sliding contact having a long life.

[0004]

The sliding contact of the present invention for solving the above-mentioned problems is a plate-shaped brush and a plate-shaped brush whose base end is arranged on at least one side of the comb teeth of the plate-shaped brush. It consists of a linear brush welded and fixed to the brush handle.

[0005]

As described above, the sliding contact of the present invention has a linear brush and a plate brush in contact with the substrate. Therefore, even if there is a slight difference in attachment of the sliding contact, the plate brush can be used. Since the comb teeth have a greater resistance to bending than the linear brush, an excessive contact force is not applied to the linear brush as in the conventional case. Therefore, the linear brush does not deform or come apart,
Contact is stable. Further, generation of abrasion powder is suppressed, and the contact life is extended.

Further, a plate brush having different contact pressures,
Supports a wide range of sliding conditions with the contact part of the linear brush,
In addition, by combining the materials, it has versatility that can correspond to various usage modes.

[0007]

EXAMPLE An example of a sliding contact according to the present invention will be described with reference to the drawing. As shown in FIG. 1, a thickness of 0.08 mm and a width of 3.0 mm of Ag 40%.
-Pd 40% -Cu 20% strip material 10 is press-pressed and molded, and then bent downward in an L-shape on one side half as shown in Fig. 2 to form a comb tooth having a length of 6.0 mm and a width of 0.35 mm. 3 11 and width 0.1
It has two slits 12 of mm and is cut out adjacent to the slit 12 and has a length in the direction orthogonal to the comb teeth 11 near the edge of the cutout 13.
A plate-like brush 16 having an arc-shaped projection 14 having a height of 1.0 mm and a height of 0.05 mm and having a caulking hole 15 for attachment having a diameter of 1.0 mm in the center of the base end portion on the other side was obtained. Next, as shown in FIG. 3, the handle of this plate-shaped brush 16 was made of Ag30% Pd35% A with a wire diameter of 0.08 mm.
A wire bundle 18 in which twelve wire rods 17 made of u10% Pt10% Cu14% Zn1% were aligned and focused in parallel was arranged as shown in FIG. 4 and fixed to the projection 14 by welding. After that, the wire bundle 18 is cut into a length of 4 mm, and the tip end portion thereof is bent downward into an L shape, as shown in FIG.
The contact portion 19 was formed as shown in FIG.

The sliding contact 1 thus obtained and, as shown in FIG. 7, a wire diameter of 0.08 mm and a length of 5.0 mm Ag30% Pd35% Au10
30 brush wires 1 made of 10% Pt10% Cu14% Zn1% are aligned and bundled in parallel, the base end of which is 0.1 mm thick and wide
The conventional example is welded to a spacer 4 made of CuNi30% with a length of 1.0 mm and a length of 3.0 mm, and the spacer 4 is welded to a base material 3 made of phosphor bronze with a thickness of 0.08 mm, a width of 4.0 mm and a length of 4.0 mm. The sliding contact of the linear brush 5 has an outer diameter of 20 mm,
When a sliding test was conducted under the following test conditions by contacting with a rotating substrate made of carbon / alumina having a thickness of 1.5 mm, the results shown in Table 1 below were obtained. Test conditions Current 2mA Voltage 5V Contact force 10g Sliding speed 3 reciprocations / sec Sliding time 300 hours

[0009]

[Table 1]

As is clear from Table 1 above, in the sliding contact of the conventional example, the amount of deformation of the contact portion was large, the variation was large and unstable, and the linear brush was often scattered. In the sliding contact of the example, the amount of deformation of the contact portion was small, the variation was small and stable, the linear brush did not come apart, and the contact was stable. In addition, compared with the sliding contact of the conventional example, the sliding contact of the example had a very small change rate of the circuit resistance before and after the test. Further, the sliding contact of the conventional example produced a large amount of abrasion powder, whereas the sliding contact of the example produced a very small amount thereof.

In the sliding contact 21 of the above embodiment, the contact portion of the comb tooth 11 of the plate brush 16 and the contact portion of the wire member 17 of the linear brush 20 are on the same line, that is, the length of the comb tooth 11 is long. The lengths of the comb teeth 11 of the plate brush 16 are gradually shortened and the length of the wire rod 17 of the linear brush 20 is lengthened so that the contact portion as a whole is shown in FIG. It may be slanted as shown in FIG. Further, although the contact portion is bent downward in an L-shape, it may be bent downward in an upward-opening arc shape. Further, although the linear brush 20 is directly projection welded to the plate brush 16, it may be welded via a spacer.

[0012]

As described above, in the sliding contact of the present invention, the brush is not deformed or scattered during rotation and sliding, the contact is stable, the generation of abrasion powder is small, and the life is long. . Further, since the sliding contact of the present invention has the characteristics of a linear brush and the characteristics of a plate brush, the materials can be easily combined, and thus it can be used in various usage modes and has versatility.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of steps of a method for producing a sliding contact according to the present invention.

FIG. 2 is a diagram showing an example of steps of a method for producing a sliding contact according to the present invention.

FIG. 3 is a diagram showing an example of steps of a method for producing a sliding contact according to the present invention.

FIG. 4 is a diagram showing an example of steps of a method for producing a sliding contact according to the present invention.

FIG. 5 is a diagram showing an example of steps of a method for producing a sliding contact according to the present invention.

FIG. 6 is a diagram showing another example of the sliding contact of the present invention.

FIG. 7 is a diagram showing a conventional sliding contact.

[Explanation of symbols]

 16 Plate brush 20 Linear brush 21 Sliding contact

Claims (1)

[Claims] 1. A sliding contact comprising a plate-shaped brush and a linear brush disposed on at least one side of comb teeth of the plate-shaped brush and having a base end portion welded and fixed to a handle of the plate-shaped brush.