JPH1197142A - Slip ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable transmission with stabilized current and voltage by fitting a conductive rotary ring having a recess at its outer peripheral center to an insulation ring fitted to a shaft, fitting a conductive fixing ring having a recess at its inner peripheral center through a sealing seal, and providing with a conductive rotary body rotating in contact with the recess. SOLUTION: On an insulating ring 8 fitted around a shaft a conductive rotary ring 10 having a recess 9 at its surface center is fitted, and thereon a conductive fixing ring 12 having a recess 11 at its inner surface center is fitted through a sealing seal 13. In a gap between the recesses 9, 11 a conductive rotary body 14 is interposed and in the body 14 conductive liquid 15 is filled. The recesses 9, 11 have grooves 16 in which conductive rotary bodies 14 rotate. Accordingly, the sliding resistance and wear are reduced. Mercury is used as the liquid 15 preferably while e.g. epoxy resin compact or the like is used preferably as the ring 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a slip ring used for a portion for transmitting current or voltage to a rotating body, a portion for transmitting current or voltage from a rotating body, or the like.

[0002]

2. Description of the Related Art A conventional slip ring is known from the theory and practice of brushes for electric machines.
Page to page 115, Japanese Patent Publication No. 4-79224, Japanese Patent Publication No. 4-79228, etc., a conductive cylindrical ring is used as a rotating ring, and its upper surface is mainly composed of carbon or silver. The mainstream is a method in which a fixed electric brush is arranged and a current or a voltage is transmitted.

FIG. 2 is a cross-sectional view of a part of these conventional slip rings, in which reference numeral 1 denotes a conductive rotating ring against which an electric brush 2 is pressed by a pressing spring 3. Reference numeral 4 denotes an electric brush holder accommodating the electric brush 2 and the pressure spring 3. The conductive rotating ring 1 is made of an insulating material ring 5.
And is electrically isolated (insulated) from the shaft 6.

[0004] However, the conventional slip ring described above can be manufactured at low cost, but the sliding resistance of the electric brush is large, and unstable transmission of current and voltage due to vibration of the electric brush, and the electric brush and the conductive rotating member are not provided. There are problems such as wear deterioration of the ring.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a slip ring which has a small sliding resistance, a stable transmission of current and voltage, a small amount of wear and a high reliability. According to a second aspect of the present invention, there is provided a slip ring having a particularly small sliding resistance and excellent transmission of current and voltage.

[0006]

SUMMARY OF THE INVENTION The present invention provides a shaft, an insulating ring mounted around the shaft, an electrically conductive rotating ring mounted on the insulating ring and having a recess in the center of the outer peripheral surface,
A conductive fixed ring having a recess at the center of the inner peripheral surface mounted on the conductive rotating ring via a sealing seal, and a gap between the recess of the conductive rotating ring and the recess of the conductive fixed ring. The present invention relates to a slip ring including a conductive rotating ring and a conductive rotating body that can rotate while being in contact with the conductive fixed ring. The present invention also relates to a slip ring in which a conductive liquid is filled in a space around a conductive rotating body.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a dimension between the recess of the conductive rotating ring and the conductive rotating body and between the recess of the conductive fixed ring and the conductive rotating body are such that the conductive rotating body can rotate stably. For example, it is preferable to provide a gap of 0.01 mm or less, and it is more preferable to provide a gap of 0.01 to 0.005 mm. The size of the gap between the recess of the conductive rotating ring and the recess of the conductive fixing ring is preferably 5 to 10 mm, more preferably 6 to 8 mm. In addition, if the conductive liquid is filled around the conductive rotating body interposed in the space between the recesses between the two rings, the contact area between the conductive rotating ring and the conductive fixed ring is increased, and the conductivity is excellent. It is preferred. The conductive liquid is not particularly limited as long as it has liquid conductivity.
In the present invention, it is preferable to use mercury.

The insulating material ring is not particularly limited as long as the shaft is insulated from the conductive rotating ring. For example, it is preferable to use a plastic molding such as an epoxy resin, a phenol resin, or a polyester resin. The conductive rotating ring, the conductive fixed ring, and the conductive rotating body are preferably made of a metal having good conductivity and being easily wetted with a conductive liquid, that is, a metal having a high frictional resistance, such as copper or brass.

The shape of the conductive rotating body is not particularly limited as long as it can rotate while being in contact with the conductive rotating ring and the conductive fixed ring, but it is preferable to use a spherical or cylindrical shape. The size (dimension) is appropriately selected according to the size of the gap. Note that the recess provided in the conductive rotating ring and the recess provided in the conductive fixed ring with the conductive rotating body interposed therebetween have smaller grooves, for example, a depth of 0.5 to 2.0.
If a groove of about mm is formed and the upper and lower parts of the conductive rotating body are inserted into this groove, the conductive rotating ring can be easily rotated smoothly,
Further, the contact area between the conductive rotating ring and the conductive fixed ring is increased, and the conductivity is excellent.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially omitted cross-sectional view of a slip ring according to an embodiment of the present invention. Reference numeral 7 denotes a shaft, which surrounds the shaft 7 to mount an insulating ring 8 thereon.
A conductive rotating ring 10 having a recess 9 in the center of the outer peripheral surface is mounted on the upper surface of the conductive rotating ring 10, and a conductive fixing ring having a recess 11 in the center of the inner peripheral surface is mounted on the conductive rotating ring 10. 12 is mounted via a sealing seal 13.

Reference numeral 14 denotes a spherical conductive rotating body interposed in a gap between the recess 9 of the conductive rotating ring 10 and the recess 11 of the conductive fixed ring 12. , And a conductive liquid 15.
Reference numeral 16 denotes a groove formed in the recess 9 provided in the conductive rotating ring 10 and the recess 11 provided in the conductive fixed ring 12.

[0012]

Embodiments of the present invention will be described below. In the slip ring shown in FIG. 1, the insulating ring 8 is made of epoxy resin, and the conductive rotating ring 10 and the conductive fixed ring 12 are made by processing brass. A carbon ring is used for the sealing seal 13 interposed between the conductive rotating ring 10 and the conductive fixed ring 12, and the size of the gap between the recess 9 of the conductive rotating ring 10 and the recess 11 of the conductive fixed ring 12 is determined. 7mm and each dent 9,
The depth of each of the grooves formed in 11 was 1 mm, and a spherical rotating body made of brass having a diameter of 8.998 mm was used as the conductive rotating body 14. Further, mercury was used for the conductive liquid 15 filled around the conductive rotating body 14 in the gap between the conductive rotating ring 10 and the conductive fixed ring 12.

The slip ring according to the present invention has the above-described configuration. When a copper wire is connected to the conductive fixing ring 12 (not shown) and a voltage is applied, a current flows through the conductive rotating body 14 and the conductive rotating body 14. Conductive rotating ring 1 via liquid 15
0 and is supplied to a rotating unit (not shown).

Next, with respect to the slip ring (hereinafter referred to as an example product) according to an embodiment of the present invention and the conventional slip ring (hereinafter referred to as a conventional product) shown in FIG. A comparative test of the amount of wear of the ring was performed.
Table 1 shows the results. The measurement conditions were as follows: For the sliding resistance, the example product was a conductive fixing ring, and the conventional product was a 0.22 kg weight applied to the electric brush, the rotational torque of the shaft at that time was determined, and the load was removed from the rotational torque. Then, the coefficient of friction was calculated, and it was shown as sliding resistance. As for the voltage drop, a current of 10 A / cm ² is applied at a rotation speed of 5 m / sec. The voltage difference between the conductive fixing ring and the conductive rotating ring is shown in the example product. The difference between the voltages of the rotating rings is shown as a voltage drop. For the amount of wear,
At a temperature of 20 ° C., the example product is applied to the conductive fixing ring, and the conventional product is applied to the electric brush at a pressure of 0.2 kg / cm ² , and is rotated at 1500 rotations for 3000 hours, before and after rotation. Indicates the difference in the diameter of the conductive rotating ring, and the conventional product indicates the difference in the length of the electric brush as the amount of wear.

[0015]

[Table 1]

As shown in Table 1, the slip ring according to the embodiment of the present invention has a small sliding resistance, a small voltage drop, a small amount of abrasion, and almost no abrasion. It is clear that it is excellent in all aspects.

[0017]

According to the first aspect of the present invention, the slip ring is a highly reliable slip ring having a small sliding resistance, stable transmission of current and voltage, and little wear. The slip ring according to the second aspect is particularly excellent in the sliding resistance and the transmission of current and voltage among the effects of the slip ring according to the first aspect.

[Brief description of the drawings]

FIG. 1 is a partially omitted cross-sectional view of a slip ring according to an embodiment of the present invention.

FIG. 2 is a partially omitted cross-sectional view of a conventional slip ring.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductive rotating ring 2 Electric brush 3 Pressure spring 4 Electric brush holder 5 Insulating material ring 6 Shaft 7 Axis 8 Insulating material ring 9 Concave 10 Conductive rotating ring 11 Concave 12 Conductive fixed ring 13 Sealing seal 14 Conductive rotation Body 15 Conductive liquid 16 Groove

Claims (2)

[Claims] 1. A shaft, an insulating ring mounted around the shaft, a conductive rotating ring having a recess in the center of an outer peripheral surface mounted on the insulating ring, and sealed on the conductive rotating ring. A conductive fixing ring having a recess in the center of the inner peripheral surface mounted via a seal and a gap between the recess of the conductive rotating ring and the recess of the conductive fixing ring, and a conductive rotating ring and a conductive member. A slip ring comprising a conductive rotating body that can rotate while being in contact with the conductive fixing ring. 2. The slip ring according to claim 1, wherein a gap around the conductive rotating body is filled with a conductive liquid.