JPH1167407A - Brush unit for slip ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate removal and replacement work for plural sets of brushes corresponding to plural slip rings. SOLUTION: Plural brush holders 2 holding brushes 1 are collected to be integrated and fixed, and a brush cover 7 or 8 is installed on a front surface of the brush 1, so handling of it is simplified, and that falling-off of the brush 1 from the brush holder 2 at the time of brush installation and removal is prevented. When the brush 1 is installed, the brush cover 7 of a plate type provided with a taper is used, and when the brush 1 is removed, the brush cover 8 of a plate type provided with protrusion/recess grooves is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush unit used in combination with a slip ring to transfer an electric signal between a stationary body and a rotating body.

[0002]

2. Description of the Related Art For transmitting electric signals between a stationary body and a rotating body, a slip ring mounted on the rotating body and a brush installed on the stationary body so as to come into contact with the slip ring are frequently used. FIG. 3 shows an example of a slip ring mounted on the circumference of the rotating body at intervals around the rotating shaft. Reference numeral 21 denotes a rotating shaft, 22 denotes a slip ring, and 23 denotes an insulator. The slip ring is made of a metal plate such as brass, and is electrically insulated from the rotating shaft and the adjacent slip ring by an insulator.

FIG. 4 is a cross-sectional view showing a brush applied to a slip ring.
Is a brush, 27 is a brush holder, 28 is a spring for pressing the brush against the slip ring, 29 is a contact fitting for attaching a lead wire, and 30 is a lead wire. FIG. 4 shows an example in which two brushes are pressed against one slip ring. However, the reason for using two brushes is to increase the reliability of contact, and there is a case where only one brush is used. .

[0004] The brush 26 is usually made of carbon or the like and is pressed from the rear by a spring 28. When the brush holder 27 is moved away from the slip ring 26, the brush 26 can be taken out from the front surface of the brush holder 27. Also, remove the screw fixing the lead wire mounting contact fitting 29 to the brush holder 27 and remove the spring 2
8 can be removed from the back of the brush holder.
Can also be taken out. Note that the brush units as shown in FIG. 4 are individually fixed to a part of the stationary body as a set for each slip ring by a fixing part (not shown).

[0005]

Since the brush is made of carbon or the like, the brush is worn by contact with the slip ring and needs to be inspected and replaced as needed. In the past, the brush unit corresponding to one slip ring was removed and fixed parts were removed one by one to check and replace the brush. However, when there are multiple slip rings in a narrow place, the work is difficult and troublesome It took According to the present invention, a plurality of sets of brushes corresponding to a plurality of slip rings are combined into one unit, and the inspection and replacement of the brushes are facilitated.

[0006]

According to the present invention, a plurality of sets of brushes corresponding to a plurality of slip rings are held by a brush holder, and the brush cover is attached by covering the front of the brush when the brush is attached or detached. Prevents falling off and facilitates workability. The brush cover is
The slip ring can be detached by sliding in the same direction as the circumferential direction of the slip ring, and the brush cover used at the time of mounting the brush is a plate-shaped one with a tapered end from the brush at one end to the brush at the other end, When the brush cover is pulled out, the plurality of brushes escape from the brush cover one by one and come into contact with the slip ring. Further, the brush cover used at the time of attaching / detaching the brush is a plate-like member having a plurality of concave / convex grooves to be fitted into the groove of the slip ring, and has a size to cover the front surfaces of the plurality of brushes.

[0007]

FIG. 1 is a view for explaining an embodiment of the present invention. FIG. 1 (A) is a perspective view of a brush unit, and FIG. 1 (B) is a brush cover used when a brush is mounted. FIG. 1C is a view showing a brush cover used when attaching and detaching the brush. In FIG. 1, 1 is a brush made of carbon or the like, 2 is a brush holder, 3a and 3b are brush holder fixing brackets, 3c is a brush cover insertion groove provided in the brush holder fixing bracket, 4a and 4b are brackets, and 5 is a bracket. A fixing plate, 6 is a brush holder fixing stand, 7 is a brush cover used when mounting a brush, 8 is a brush cover used when removing and attaching a brush, and 9 is a fixing screw.

FIG. 2 is a view when the brush unit is pressed against the slip ring, and the same reference numerals as those in FIG. 1 denote the same parts. Reference numeral 10 denotes a brush holder skewing fixing bolt, and reference numeral 11 denotes a slip ring. The brush 1 is held by a brush holder 2 and is urged forward by a spring (not shown) disposed in the brush holder 2, and a contact fitting and a lead wire are arranged behind the spring. Although it does not change, if a plurality of lead wires are collectively wired to one multi-core connector, it is possible to simplify the handling of the lead wire wiring system.

In the embodiment of the present invention, a plurality of brush holders 2 are held in parallel by brush holder fixing brackets 3a and 3b and fixed by brush holder skewing fixing bolts 10. 4b, the fixing plate 5, and the fixing screw 9 are fixed. The brush holder fixing brackets 3a and 3b are provided with brush cover insertion grooves 3c so that the brush cover 7 or 8 can be mounted on the front surface of the brush 1.

In FIG. 1, the brush holders are made of an insulating material and are arranged in a row. The brush holders 3a and 3b are integrated with the brush holder fixing brackets 3a and 3b and the brush holder skewing fixing bolt 10, but the brush is provided. It is also possible to manufacture them all at once from an insulator before performing the process. Also, two brushes are mounted on each brush holder,
One can be installed.

In mounting the brush on the slip ring surface, a brush cover 7 used at the time of mounting is used. When the brush cover 7 is set by inserting it into the insertion groove 3c, the brush 1 is pressed backward against the spring to prevent the brush 1 from jumping out, and the brush 1 comes off from the brush holder 2 regardless of the inclination of the brush unit. Can be prevented. In this state, the entire brush unit is pressed against the front surface of the slip ring 6, and then the brush cover 7 is slowly pulled out. Then, since the tip of the brush cover 7 is tapered, the brush 1
The brushes 1 escape from the brush cover 7 one by one, and the brushes 1 are surely pressed by the slip ring 11 one by one by the spring.

When the brush unit is detached from the slip ring, a brush cover 8 used at the time of detachment is used. In order to insert the brush cover 8 between the slip ring 6 and the brush 1, it is necessary to loosen the pressure of the brush against the slip ring surface to create a slight gap.
Therefore, the fixing plate 5 is removed, and the brush holder fixing brackets 3a and 3b, the brush holder skewing fixing bolt 1
The brush holder 2 integrated with the
a, lift from 4b. Then, since a slight gap is formed between the brush 1 and the slip ring 11, the brush cover 8 is inserted into the insertion groove 3c, and the entire front surface of the brush is covered with the brush cover 8. Thereafter, if the brush unit is removed, the brush does not jump out of the brush holder and fall off.

The brush cover 7 needs to be pushed into the brush holder against the bias of the brush by the spring, so that the brush cover 7 must have enough strength to withstand this.
A plate of 7-1.0 mm stainless steel is sufficient.
The brush cover covers the entire front surface of multiple brushes to prevent the brushes from falling off, and has the function of helping the brushes to be surely pressed by the slip ring by removing the brushes one by one from the brush cover surface when installing. Therefore, the material is not limited to metal, but may be an insulating material such as hard plastic. Since the brush cover 8 needs a plurality of concave and convex grooves to be fitted into the grooves of the slip ring, the same material as that of the brush cover 7 is used.

[0014]

According to the brush unit of the present invention, a plurality of brush holders are integrated, and a brush cover is mounted on the front of the brush when the brush is mounted and when the brush is detached, so that the handling is simplified. Further, it is possible to prevent the brush from dropping out of the brush holder when handling the brush unit.

[Brief description of the drawings]

1A is a perspective view of a brush unit according to an embodiment of the present invention, FIG. 1B is a view showing a brush cover used when a brush is mounted, and FIG. is there.

FIG. 2 is a diagram when a brush unit is pressed against a slip ring.

FIG. 3 is a diagram showing an example of a slip ring.

FIG. 4 is a cross-sectional view of a brush applied to a slip ring.

[Explanation of symbols]

 1: Brush 2: Brush holder 3a, 3b: Brush holder fixing bracket 3c: Brush cover insertion groove 4a, 4b: Bracket 5: Fixing plate 6: Brush holder fixing base 7: Brush cover used when installing brush 8: When removing brush Brush cover to be used 10: Brush holder skewer fixing bolt 11: Slip ring

Claims (3)

[Claims] A brush used for transmitting a signal by contacting a plurality of slip rings mounted on a rotating body is held and arranged in a brush holder for each slip ring, and a brush front face is attached to and detached from the brush. A brush unit for a slip ring, wherein a brush cover is attached so as to cover the brush ring. 2. A brush cover is detachable by sliding in the same direction as the circumferential direction of the slip ring, and a brush cover used at the time of mounting the brush has a tapered end portion from one end brush to the other end brush. The brush unit for a slip ring according to claim 1, wherein when the brush cover is pulled out, a plurality of brushes escape from the brush cover one by one and come into contact with the slip ring. 3. The brush cover is detachable by sliding in the same direction as the circumferential direction of the slip ring, and the brush cover used at the time of attaching and detaching the brush is a plate having a plurality of concave and convex grooves fitted into the groove of the slip ring. 2. The brush unit for a slip ring according to claim 1, wherein the brush unit has a shape and covers a front surface of the plurality of brushes. 3.