JPH0696823A - Sliding contact - Google Patents

Abstract

PURPOSE:To increase the number of contact points, and to improve density and accuracy by providing a linear brush on a plate brush, by welding the base end part of the linear brush to the plate brush through a spacer, and whereby forming a contact part between the plate brush and the linear brush. CONSTITUTION:After a band material is punched to form comb teeth and slits on the front end part, the front end part is bent downward into L-shape, and a plate brush 15 having a contact part 14 is formed. After a wire bundle, for which wire rods are aligned and bundled in parallel to one another, is welded to a spacer 18, the wire bundle is cut an the front end part thereof is bent downward into an L-shape, to form a contact part 19, and a linear brush 20 is thus formed. The brush 20 is provided on the brush 15, and an upper spacer 18, for which the contact part 19 of the brush 20 is provided in front of the contact part 14 of the brush 15, is welded to the upper surface of the base of the brush 15, and a sliding contact 21 is thus formed. The number of contact points can be increased without widening the flat area, and the density and the accuracy are improved, while the contact reliability is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sliding contacts used in encoders, trimmers, variable resistors, sensors and the like.

[0002]

2. Description of the Related Art Conventionally, a wire bundle 2 in which a large number of wire rods 1 are aligned and focused in parallel as shown in FIG. A linear brush 5 that is welded to the base material 4 via the spacer 3 is used.

By the way, the sliding contact of the linear brush 5 is limited in width when the number of the wire rods 1 is further increased to increase the number of contact points in order to achieve high density and high accuracy. Will be restricted to use in the space.

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, the number of contact points is increased without increasing the flat area (width) to achieve higher density and higher accuracy, and further improve contact reliability. It is intended to provide the sliding contact.

[0005]

In the sliding contact of the present invention for solving the above-mentioned problems, a linear brush is arranged on the upper side or the lower side of a plate brush, and the base end portion of this linear brush is a plate. The contact portion of the plate-like brush and the contact portion of the linear brush are formed in front and back by being welded to the linear brush or directly via a spacer.

[0006]

As described above, in the sliding contact according to the present invention, the linear brushes are arranged on the upper side or the lower side of the plate-like brush and overlapped with each other, so that the contact point is increased without increasing the plane area (width). Increased, higher density and higher precision are achieved, and contact reliability is further improved. Further, since the sliding contact of the present invention has a plate-shaped brush and a contact portion of a linear brush that have different contact pressures, respectively,
Supports a wide range of sliding conditions.

[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 5.0 mm of Ag40%.
-Pd 40% -Cu 20% strip material 10 is press-pressed and the tip part is molded, and the length is 5 mm and the width is 0.35 mm as shown in FIG.
Has 5 comb teeth 11 and 4 slits 12 with a width of 0.1 mm, has a caulking hole 13 for mounting with a diameter of 0.8 mm at the base, and a contact portion 14 bent downward in an L shape at the tip. Plate brush 15
Got On the other hand, as shown in Fig. 3, wire diameter 0.08mm Ag40%
As shown in Fig. 4, a wire bundle 17 in which 12 wire rods 16 made of -Pd40% -Cu20% are aligned and bundled in parallel is 0.7 mm wide and thick.
Spacer 18 made of CuNi30 with a length of 0.1 mm and a length of 2.0 mm 18
After welding, the wire bundle 17 was cut into a length of 4 mm, and the tip portion thereof was bent downward into an L shape to form a contact portion 19 to obtain a linear brush 20. And a linear brush on the upper side of the plate brush 15.
In addition to arranging 20 as shown in FIG. 5, the contact portion 19 of the linear brush 20 is arranged in front of the contact portion 14 of the plate brush 15,
The spacer 18 was welded to the upper surface of the base of the plate brush 15 to obtain the sliding contact 21.

The sliding contact 21 thus obtained and, as shown in FIG. 6, a wire diameter of 0.08 mm and a length of 4 mm Ag40-Pd40, Cu20%
20 brush wires 1 made of CuNi are aligned and bundled in parallel, and the base ends of these are made of CuNi having a thickness of 0.1 mm, a width of 0.7 mm, and a length of 2.0 mm.
Weld to the spacer 3 consisting of 30 to make the thickness of the spacer 3
The sliding contact 5 of the conventional example formed by welding to the base material 4 of 0.08 mm, width 3.0 mm, and length 4 mm made of phosphor bronze has an outer diameter
When a sliding test was conducted under the following test conditions by making contact with a rotating substrate of carbon / alumina having a thickness of 20 mm and a thickness of 1.5 mm, the results shown in Table 1 below were obtained. Test conditions Current 2mA Voltage 5V Contact pressure 10g Sliding speed 3 reciprocations / sec Sliding time 300 hours

[0009]

[Table 1]

As is clear from Table 1 above, in the sliding contact 5 of the conventional example, the amount of deformation of the contact portion was large, and the variation was large and unstable, and the linear brush was often scattered. The sliding contact 21 of the embodiment has a small amount of deformation of the contact portion,
The variation was small and stable, the linear brush did not come apart, and the contact was stable. Further, compared with the sliding contact 5 of the conventional example, the sliding contact 21 of the embodiment has achieved high density and high accuracy, and the change rate of the circuit resistance before and after the test is very small, so that the contact reliability is high. Was extremely high.

In the sliding contact 21 of the above embodiment, the linear brush 20 is arranged on the upper side of the plate brush 15, but it may be arranged on the lower side. Also, attach the linear brush 20 to the spacer 18.
Although it is welded to the plate-shaped brush 15 via, it may be welded directly. Furthermore, plate brush 15, linear brush 20
Although the contact portions 14 and 19 are both bent downward in an L shape, they may be bent downward in an upward arc shape.

[0012]

As described above, the sliding contact of the present invention can increase the number of contact points without increasing the plane area (width) to achieve higher density and higher precision, and further contact. Improves reliability. Further, the brush is not deformed or dislodged during the rotation and sliding, the contact is stable, and the life is long.
Furthermore, since the contact portions of the plate-shaped brush and the linear brush having different contact pressures are arranged in front and rear, a wide range of sliding conditions can be dealt with.

[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 a conventional sliding contact.

[Explanation of symbols]

 14 Contact part 15 Plate brush 18 Spacer 19 Contact part 20 Linear brush 21 Sliding contact

Claims (1)

[Claims] 1. A linear brush is arranged on the upper side or the lower side of a plate-shaped brush, and the base end of this linear brush is welded to the plate-shaped brush directly or via a spacer to contact the contact portion of the plate-shaped brush. A sliding contact formed by forming the contact portion of the linear brush back and forth.