JP2012079434A - Slip ring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that generation of abrasion powder causes electric noise or poor insulation thus requiring maintenance and inspection every time when abrasion powder is generated, and to prevent poor insulation by not generating abrasion powder.SOLUTION: The slip ring device 1 comprises a shaft body 2 supported rotatably about a shaft, a plurality of electrode rings 7 laminated rotatably on the shaft body 2 through an air gap and having a gold pattern 17 formed round each inner peripheral wall, a plurality of electrode rings 8 having a gold pattern 12 formed round each outer peripheral wall, and a plurality of stages of gold wire brush 4 provided for each electrode ring 7, 8 and having a plurality of gold wires, respectively. The midway part of each gold wire of these gold wire brushes 4 touches the gold pattern 12, 17 to configure a gold contact slip ring.

Description

  One embodiment relates to a slip ring device.

  For example, an antenna directing device such as a radar device has a vertical slip ring device having a rotation axis extending in the vertical direction. In this type of slip ring device, an electrode ring is provided on the rotating side, a brush is provided on the fixed side, and the brush can slide on the ring outer peripheral surface of the electrode ring. When the rotation-side electrode ring is driven to rotate, the fixed-side brush comes into sliding contact with the outer peripheral surface of the ring, and electrical coupling is performed between the rotation-side and the fixed-side. Lubricating grease is applied to the slip ring to reduce friction caused by the sliding contact of the brush.

JP 2006-107925 A Japanese Unexamined Patent Publication No. 04-259712

Koichiro Sawa, 5 others, “Degradation Process of a Sliding System with Au-plated Slip-ring and AgPd Brush for Power Supply”, IEEE Holm Conference, 5 Shinya Kobayashi, 4 others, “A Study of Sliding Characteristic of Small-Size Slip-Ring System for Electric Power Supply”, IEEE Holm Conference, 2007

  However, in the conventional technology, when abrasion powder is generated, the abrasion powder adheres to the base side of the brush and easily causes electrical noise and insulation failure. Wear powder falls from the slip ring and scatters around it, causing poor insulation. For this reason, there is a problem that a maintenance inspection is required every time the wear powder is generated.

  In order to solve such a problem, according to one embodiment, a shaft body that is rotatably supported around an axis, and each of the outer peripheral walls or each A plurality of electrode rings each having a gold pattern formed on an inner peripheral wall, and a plurality of gold wire brushes provided for each of the electrode rings, each having a plurality of gold wires. A slip ring device is provided in which a middle portion of each gold wire of the wire brush contacts the gold pattern to constitute a gold contact slip ring.

It is a front view of the slip ring device concerning a 1st embodiment. (A) is a bottom view of the slip ring device according to the first embodiment, and (b) is a top view of the slip ring device according to the first embodiment. It is an enlarged front view which shows the principal part of the outer peripheral wall of the electrode ring of the slip ring apparatus which concerns on 1st Embodiment. It is the longitudinal cross-sectional view which expanded the outer peripheral wall of the electrode ring of the slip ring apparatus which concerns on 1st Embodiment. It is a perspective view of the multi-stage gold wire brush of the slip ring device concerning a 1st embodiment. It is a figure which shows the slip ring apparatus which concerns on a comparative example. (A) is a bottom view of the slip ring device according to the second embodiment, and (b) is a top view of the slip ring device according to the second embodiment. It is a top view for demonstrating the gold | metal wire brush used for the slip ring apparatus which concerns on 3rd Embodiment. (A), (b) is a horizontal sectional view which shows the contact site | part of the slip ring apparatus which concerns on 4th Embodiment.

Hereinafter, a slip ring device according to an embodiment will be described with reference to FIGS. 1 to 9. In the drawings, the same portions are denoted by the same reference numerals, and redundant description is omitted.
Prior to the description of the embodiment, the contents studied by the present inventors in the process of reaching the slip ring device according to the embodiment will be described. The conventional slip ring apparatus uses a brush using silver graphite. Silver graphite brushes have the property that powder is peeled off by oxidation. The silver graphite brush rusts while the electrode ring of the slip ring device is stopped. The brush is pressed against the outer peripheral surface of the ring in a state where a strong brush pressure is applied by a spring or the like. When the operation of the slip ring device is resumed, the surface of the silver graphite brush is scraped off. Powder and pieces fall. In a situation where the slip ring device is operated in an operation pattern in which rotation and stop are repeated, it is necessary to remove rust generated on a part of the outer peripheral surface of the electrode ring when the operation of the slip ring device is resumed. Before resuming operation, smoothing is performed to remove rust covering the contact surface, to secure a contact surface between the electrode ring and the brush, and to conduct current. Powder and pieces scraped off from the surface of the silver graphite brush are generated.

  Reducing the tip size of the silver graphite brush in order to reduce the amount of wear powder reduces the amount of power that can be transmitted. Sparks are likely to occur. On the other hand, increasing the chip size of the silver graphite brush causes an increase in wear powder. The method of reducing the chip size and increasing the chip size with respect to the amount of wear powder falls into a vicious circle and is not a solution.

  Compared to the above-described prior art, it is possible to prevent the generation of wear powder by using the property of gold Au that the peeled portions easily stick to each other and using a gold tip brush for the slip ring. . Even if a gold brush or a gold-plated brush is slidably contacted with the outer peripheral surface of the ring, the gold powder is hardly peeled off from the solid content and wear powder is hardly generated.

  However, since the price of chip-shaped gold is high, it can be replaced by using a gold wire brush in the form of a fine gold wire. The present inventor prepared a gold wire brush and prepared an electrode ring slip ring device having the same size as the electrode ring used for the silver graphite brush. An experiment was conducted in which a gold wire brush was brought into contact with the ring outer peripheral surface of the slip ring device. After causing the slip ring device to perform electrical coupling between the brush and the electrode ring, the slip ring device was stopped. As a result of visual observation, the gold wire brush was darkened. It was confirmed that a burnt trace was present on the surface of the plurality of gold wires.

  The present inventor compared the silver graphite brush and the gold wire brush and examined the experimental results. The silver graphite brush had a rectangular parallelepiped shape, and the entire surface of the silver graphite brush was in contact with the outer peripheral surface of the ring. On the other hand, in the gold wire brush, a plurality of thin gold wires slid and contacted each other while hitting the saw wire in a vertical line on the outer peripheral surface of the ring. As a result of intensive studies, the present inventors have found that the contact area between the gold wire brush and the ring outer peripheral surface is smaller than the contact area between the silver graphite brush and the outer peripheral surface of the ring. When the contact part was enlarged and analyzed in detail with a dedicated device, the part where the gold wire brush hits the outer peripheral surface of the ring was point contact, and when the tip of the gold wire, which was a thin wire, was enlarged, The round spherical tip was in contact with the outer peripheral surface of the ring. The present inventor has found that the contact area by the gold wire brush is a very small value.

  Since the gold wire brush is in point contact, it is considered that the contact voltage drop is large. Since the gold wire brush generates a potential difference by the gold wire brush, the lost energy is generated as heat from the total energy supplied from the power source to the gold wire brush, and the heat is generated from the ring outer peripheral surface and the ambient temperature. To raise. Also, when lubricating grease is applied due to temperature rise, this grease evaporates. Contact area deteriorates due to insufficient lubrication. For this reason, it is thought that the burnt mark was attached to the gold wire brush.

Experimental results show that it is difficult for a slip ring device using a gold contact slip ring to transmit a large amount of power.
Therefore, the present inventor has proposed a slip ring device according to an embodiment in which the contact area between the gold wire brush and the ring outer peripheral surface is increased and the contact voltage is not lowered. Hereinafter, the slip ring device according to the embodiment will be described.

(First embodiment)
FIG. 1 is a front view of the slip ring device according to the first embodiment. Fig.2 (a) is a bottom view of the slip ring apparatus which shows the arrangement structure of an electrode ring, a brush, and a brush holder. In these drawings, a structural example of the same slip ring device with the cover removed is shown.
The slip ring device 1 is a vertical rotating body device having a gold contact slip ring using a gold wire brush. The slip ring device 1 is connected, for example, between a fixed-side power source and a rotation-side load, and transmits power from these power sources to the load. The slip ring device 1 includes a shaft body (rotating shaft) 2 that receives a driving force from a driving mechanism and rotates in the vertical axis direction, a hollow cylindrical power supply stage ring 3 that rotates with the rotation of the shaft body 2, and a shaft. A pair of left and right, viewed from the direction, is arranged in a letter “C” shape and is provided with a plurality of upper and lower stages, each of which is in contact with a conductive portion of the power stage ring 3 and is electrically coupled to the power stage ring 3 A wire brush 4 and a cover 20 that covers the outer periphery of the power stage ring 3 are provided.

  The slip ring device 1 uses all electrode rings in the upper half of the plurality of electrode rings arranged in a stacked manner as slip rings for ground potential, and the lower half through an insulating insulator provided in the center in the height direction. All electrode rings are used as slip rings for positive potential. The gold wire brush 4 of the upper half of all the gold wire brushes 4 is provided inside the ring, and the gold wire brush 4 of the remaining lower half is provided outside the ring. All of these gold wire brushes 4 are each composed of a plurality of fine gold wires. In a part of the curved portion excluding both ends of the plurality of gold wires, a curve having a bending radius substantially the same as the radius of curvature of the outer peripheral surface of the upper electrode ring and the radius of curvature of the inner peripheral surface of the lower electrode ring is formed in advance. . Bending radius refers to the degree of curvature. This degree of curvature is indicated by the size of the opening of the “C” in the top view of the gold brush. The curved portion of each gold wire is in line contact with the outer peripheral surface of the ring and the inner peripheral surface of the ring, and the contact area is increased to reduce the contact voltage drop.

  The shaft body 2 is a rotor shaft. The shaft body 2 is supported by a fixed body 6 via a bearing 5 so as to be rotatable. The power stage ring 3 supplies DC power from the power source to a load such as an antenna directing device. The power stage ring 3 includes a plurality of stages of ground electrode rings 7 each of which is a rotating body to which a ground potential is applied, a plurality of stages of positive electrode rings 8 each of which is a rotating body and to which a positive potential is applied, and a lower ground electrode. An insulating plate 9 (insulator) for electrically insulating the ring 7 and the upper plus electrode ring 8 is provided.

  The ground electrode ring 7 and the plus electrode ring 8 are both cylindrical, and are arranged coaxially with each other around the vertical axis. As an example, the ground electrode rings 7 in the upper half are all slip rings for ground potential, and the positive electrode rings 8 in the lower half are all for positive potential via an insulating plate 9 provided in the center in the height direction. It is a slip ring. The ground electrode rings 7 are separated by a gap, and the plus electrode rings 8 are separated by a gap. When a rotational force is applied to the shaft body 2 via the drive mechanism or the transmission mechanism, each ground electrode ring 7, the insulating plate 9, and the plus electrode ring 8 rotate with respect to the fixed body 6. The flange portion 10 is stationary with respect to the fixed body 6.

  For the insulating plate 9, for example, an epoxy resin molding is used. The insulating plate 9 has a hollow portion around the axis and has a donut shape. Wear powder, thread-like metal pieces, chips and the like from the ground electrode ring 7 are dropped onto the fixed body 6 through the hollow portion. The outer diameter of the insulating plate 9 is larger than both the outer diameter of the ground electrode ring 7 and the outer diameter of the plus electrode ring 8. The insulating plate 9 has a sufficient thickness in the height direction to insulate the ground electrode ring 7 and the plus electrode ring 8 from each other.

  The plus electrode ring 8 at each lower stage among the upper and lower stages will be described. The plus electrode ring 8 is made of a metal cylinder such as brass, and has an inner inner peripheral wall surface and an outer outer peripheral wall surface. Several rows of gold plating are applied to the outer peripheral wall of each plus electrode ring 8 in parallel in the vertical direction. A gold wire brush 4 is provided on the outer periphery of the positive electrode ring 8. Each gold wire brush 4 is composed of, for example, about 10 gold wires (hereinafter referred to as “10”). One end of the gold wire is in line contact and the other end is held by the brush holder 11. The curved portions of these gold wires have a bending radius substantially the same as the curvature curvature of the ring outer peripheral wall. The curvature is given in advance. The curved portion of each gold wire is inserted into the groove on the outer peripheral wall of the ring and comes into line contact. The brush holder 11 is a plate-like stationary object and is made of an insulating material. The brush holder 11 is fixed to a pillar (not shown) so as not to contact the cover 20.

  FIG. 3 is an enlarged front view showing the main part of the outer peripheral wall of the plus electrode ring 8. FIG. 4 is an enlarged longitudinal sectional view of a portion indicated by A in FIG. FIG. 5 is a perspective view of a multi-stage gold wire brush 4. In these drawings, the above-described symbols represent the same elements as those described above.

  The ring outer peripheral surface of the plus electrode ring 8 has a gold plating portion 12 (gold pattern) and a non-gold plating portion 13. The gold plating portion 12 is formed around the outer wall surface of the metal substrate and has a band-like width along the vertical direction. Each gold plating part 12 is provided separated by a gap. The non-gold plated portion 13 is formed on a metal substrate and is, for example, an insulating material. One belt-like gold-plated portion 12 has an outer surface and an inner surface when viewed from the rotational axis, and a plurality of grooves 14 are formed on the outer surface. The groove 14 is, for example, a U-shaped groove, and one groove 14 has two inclined groove walls. One gold wire 15 of the gold wire brush 4 slides in contact with the groove 14 so as to be in contact with these inclined groove walls at two or more locations. When the gold wire 15 contacts the groove 14 at two or more locations, the contact voltage drop is reduced. The contact voltage drop refers to a value representing the potential difference between the contact side and the contacted side by voltage. By reducing the contact voltage drop, the amount of heat radiated from the gold wire 15 to the device and the outside air is reduced. The roots of the gold wires 15 are bundled in a line, and one gold wire brush 4 has a thin or one-piece brush body. The vertical interval between the gold wire brushes 4 in a plurality of stages is substantially equal to the vertical interval between the gold-plated portions 12 on the ring side.

  The ground electrode ring 7 at each lower stage is also made of a metal cylinder such as brass, and has an inner peripheral wall surface on the inner side and an outer peripheral wall surface on the outer side. Several rows of gold plating are applied to the inner peripheral wall of each ground electrode ring 7 in the vertical direction.

  FIG. 2B is a top view of the slip ring device 1 showing the arrangement structure of the electrode ring, the brush, and the brush holder. The above-mentioned codes are the same as those. Another brush holder 16 is provided inside each ground electrode ring 7, and a plurality of stages of gold wire brushes 19 are held in the brush holder 16. Each gold wire brush 19 is composed of ten gold wires. The curved portions of these gold wires have a bending radius substantially the same as the curvature curvature of the inner circumferential wall of the ring. The curvature is given in advance. The curved portion of each gold wire is inserted into the groove on the inner peripheral wall of the ring and makes line contact. The brush holder 16 is a plate-like stationary object and is made of an insulating material. The ring inner peripheral surface of the ground electrode ring 7 includes a gold plating portion 17 (gold pattern) formed in a belt shape on the ring inner peripheral surface and a non-gold plating portion (not shown). For example, a plurality of U-shaped grooves 18 are formed on the surface of each gold plating portion 17 facing the rotational axis. The vertical position of each groove 18 is the same as the vertical position of the gold plating portion 17. The vertical width of each groove 18 is the same as the vertical width of the gold plating portion 17. The gold wire is inserted into the groove 18, and one gold wire is in contact with two opposing inclined groove walls at two locations.

  In the slip ring device 1 having such a configuration, a hot plus wiring and a return ground wiring are connected to a DC power source. Rotation drive to the shaft body 2 is started, and current is applied to the slip ring device 1 from a DC power source. Each brush group slides in contact. On the ring inner peripheral surface of each ground electrode ring 7, each gold wire brush 4 and the gold plating portion 17 constitute a slip ring, and these gold wire brush 4 and the gold plating portion 17 are electrically coupled. Each gold wire brush 4 and the gold plating part 12 constitute a slip ring on the ring outer peripheral surface of each plus electrode ring 8, and the brush and the gold plating are electrically coupled. The slip ring device 1 transmits power supply power.

  In the slip ring device 1, a plurality of stages of gold wire brushes 4 are brought into contact with the outer peripheral surface of the ring and the inner peripheral surface of the ring. In the upper ground electrode ring 7, the curved portions of the ten gold wires 15 are in line contact with the groove wall of the groove 14 on the outer peripheral surface of the ring. In the lower plus electrode ring 8, the curved portions of the ten gold wires 15 are in line contact with the groove wall of the groove 18 on the inner peripheral surface of the ring. The contact area when each gold wire 15 is brought into sliding contact with each groove wall is larger than the contact area when each gold wire 15 makes point contact with the electrode ring peripheral wall surface without grooves. By making contact so as to increase the contact area, the contact voltage drop in the slip ring device 1 can be reduced more than the contact voltage drop in the slip ring device using a point contact type gold wire brush. The temperature rise of the slip ring device 1 is suppressed, and the life of the slip ring device 1 can be extended.

A comparative example using the gold wire point contact method will be described with reference to FIG.
FIG. 6A is a bottom view of a slip ring device according to a comparative example. FIG. 6B is a horizontal cross-sectional view showing a contact portion between a gold wire and a ring in which a portion denoted by B is enlarged in FIG. Elements with the above-described symbols represent the same elements. The slip ring device 100 includes an electrode ring 101 and a gold wire brush 102 that makes point contact with the outer peripheral surface of the electrode ring 101. One gold wire brush 102 includes a plurality of gold wires 103. As shown in FIG. 6B, the cylindrical electrode ring 101 has an outer peripheral wall having a thickness, and the tip of the gold wire 103 is in contact with the outer peripheral wall surface at one point. The contact area is very small. The contact voltage drop between the gold wire brush 102 and the ring is large. By point contact, energy is lost and heat is generated by the lost energy. Point contact may lead to abnormal wear of the tip of the gold wire 103.

  In contrast, in the slip ring device 1 according to the present embodiment, as shown in FIG. 2 (a), line contact is ensured by bringing the belly portion of the gold wire 15 of the gold wire brush 4 into contact with the outer peripheral surface of the ring. Is done. An antinode refers to a curved portion in the middle of a wire different from the tip of the wire of the gold wire 15. The gold wire 15 is inserted into the grooves 14 and 18, and the wire surface of the gold wire 15 and the two groove walls opposed to each inclined surface are in line contact at two upper and lower positions. Line contact can be secured at two locations for one gold wire 15. Contact voltage drop does not increase. Temperature rise is unlikely to occur at the point contact portion caused by point contact of the gold wire 102, and abnormal heat generation does not occur.

In this way, the slip ring device 1 can transmit a large amount of power using the gold contact slip ring. High power can be transmitted without increasing the amount of gold used without enlarging the brush portion. The temperature does not rise excessively, the lubricating grease does not evaporate, and the lubrication state between the gold wire brush 4 and the ring can be maintained.
Even if a gold contact slip ring is used, the slip ring device 1 can reduce the contact voltage drop, prevent generation of wear powder, and prevent insulation failure. Maintenance inspection required every time abrasion powder is generated becomes unnecessary.

(Modification)
When lubricating grease is applied to the ring outer peripheral surface of the electrode ring 101 of the slip ring device 100 according to the comparative example of FIG. 6, the lubricating grease is cured in a low temperature environment. When the slip ring device 100 starts rotating, there is a problem that power transmission by the slip ring device 100 is momentarily interrupted.
In the slip ring device according to the modification of the first embodiment, a heat source 28 is further incorporated in the slip ring device 1 so as not to cause hardening of the grease. The heat source 28 is, for example, a heater that can supply preheat. A heat storage element capable of storing heat may be used as the heat source 28.
In the slip ring device according to this modification, grease is applied to the ring surfaces of the ground electrode ring 7 and the plus electrode ring 8 to reduce the sliding resistance between the gold wire brush 4 and the grooves 14 and 18. In a low-temperature environment, heating is performed by heating the heat source, so that there is no instantaneous power interruption of the slip ring device that occurs when the lubricating grease is cured at a low temperature.

(Second Embodiment)
In the first embodiment, the gold wire brushes 4 have the same mechanical configuration between the positive electrode rings 8 of each stage, and these gold wire brushes 4 have substantially the same natural frequency. Between the ground electrode rings 7 of each stage, each gold wire brush 19 has the same mechanical configuration, and these gold wire brushes 19 have substantially the same natural frequency. All the ten gold wires 15 have the same shape. The power stage ring 3 is rotated by receiving a rotational force via a rotational drive mechanism or a rotational force transmission mechanism. On the lower half side from the insulating plate 9, when the natural frequency of the vibration generated by the rotation and the natural frequency of the gold wire 15 are the same, ten gold wires resonate with the vibration by the rotation, and these gold wires are Swings greatly. A plurality of gold wire brushes 4 on the ring outer peripheral surface side resonate with vibration caused by rotation, and these gold wire brushes 4 shake greatly. The same applies to the example of the slip ring on the inner peripheral surface of the upper half ring. When the natural frequency of vibration caused by rotation and the natural frequency of a gold wire (not shown) are the same, these gold wires vibrate greatly due to this vibration, or the gold wire brushes 19 of a plurality of stages resonate. However, these gold wire brushes 4 shake greatly. For this reason, the contact pressure with respect to the slip ring on the ring outer peripheral surface side and the contact pressure with respect to the slip ring on the ring inner peripheral surface side may simultaneously decrease. A good electrical coupling state cannot be maintained in any slip ring. Any of the slip rings may cause a sliding contact abnormality such as insufficient contact pressure, and may generate wear powder.

FIG. 7A is a bottom view of the slip ring device according to the second embodiment, and FIG. 7B is a top view of the slip ring device. In these figures, the above-mentioned reference numerals are the same. The slip ring device 1 </ b> A has the function of the slip ring device 1 according to the first embodiment, and has a function of stabilizing the contact state of the slip ring against resonance caused by rotational vibration. In this embodiment, the slip ring device 1A in which the gold wire is formed in a curved shape is provided with a power stage ring 21. The power stage ring 21 includes a plurality of upper ground electrode rings 7A and a plurality of lower stages. A positive electrode ring 8A. The ground electrode ring 7A constitutes a slip ring on the outer peripheral surface of the ring, and the plus electrode ring 8A constitutes a slip ring on the inner peripheral surface of the ring.

  As shown in FIG. 7A, the lower plus electrode ring 8A is provided with a plurality of stages of gold wire brushes 4 on the outer periphery and in a pair of left and right and upper and lower stages. The positive electrode ring 8 </ b> A includes a brush holder 11 and another brush holder 22 that is provided in a symmetrical position with respect to the brush holder 11 and the shaft body 2. The brush holder 22 holds a plurality of stages of gold wire brushes 23. The natural frequency of the gold wire brush 23 is different from the natural frequency of the gold wire brush 4. The gold wire brush 23 is composed of 10 gold wires. The plurality of stages of gold wire brushes 23 are provided in a pair of left and right and in a plurality of stages. The curved portions of these gold wires have a radius of curvature different from the radius of curvature of the gold wire 15 on the opposite side of the gold wire brush 4, and the curved portion of each gold wire is inserted into the groove 14 on the ring outer peripheral wall. It comes to contact. The curvature is given in advance. The brush holder 22 is also a stationary object, is made of an insulating material, and is fixed to the pillar so as not to contact the cover 20.

  Further, as shown in FIG. 7B, another brush holder 24 is also provided in each ground electrode ring 7 </ b> A, and a plurality of stages of gold wire brushes 25 are held by the brush holder 24. Each gold wire brush 25 is provided in a pair of left and right and in multiple upper and lower stages inside the inner peripheral surface of the ring. The natural frequency of the gold wire brush 25 is different from the natural frequency of the gold wire brush 19. The curved portions of the ten gold wires of each gold wire brush 25 have a bending radius substantially the same as the radius of curvature of the inner circumferential wall of the ring. The curvature is given in advance. The curved portion of each gold wire is inserted into the groove 18 on the inner peripheral wall of the ring and comes into line contact. These gold wires have a curvature different from the curvature of the gold wire of the gold wire brush 19 disposed opposite to the shaft body 2. The brush holder 24 is a plate-like stationary object and is made of an insulating material.

  The slip ring device 1A having such a configuration starts to rotate the power stage ring 21. Inside the ring of the ground electrode ring 7A, a plurality of stages of gold wire brushes 25 in which the gold wires are bent with a small degree and a plurality of stages of gold wire brushes 19 in which the gold wires are bent with a large degree each constitute a slip ring. And electrical coupling. The gold wire brush 25 is in line contact with the groove such as the groove 18 at a steep contact angle, and the gold wire brush 19 is in line contact with the groove at a loose contact angle. Since the natural frequency of the gold wire brush 19 and the natural frequency of the gold wire brush 25 are different, the rotating power stage ring 21 is prevented from resonating at the natural frequency. It is possible to prevent contact failure from occurring simultaneously in the slip ring by the gold wire brush 25 and the slip ring by the gold wire brush 19.

  Further, even outside the ring of the positive electrode ring 8A, the gold wire brush 23 is in line contact with the groove portion such as the groove 14 at a steep contact angle, and the gold wire brush 4 is in line contact with the groove portion at a loose contact angle. The natural frequency of the gold wire brush 23 is different from the natural frequency of the gold wire brush 4. The rotating power stage ring 21 does not resonate at the natural frequency. The slip ring caused by the gold wire brush 23 and the slip ring caused by the gold wire brush 4 do not cause contact failure at the same time.

As a result, it is possible to prevent a plurality of gold wires of the gold wire brush 25 and the gold wire brush 19 from causing a contact failure at the same time inside the ring. On the outer side of the ring, a plurality of gold wires of the gold wire brush 23 and the gold wire brush 4 can be prevented from causing a contact failure at the same time. A contact failure accident such as a momentary interruption can be prevented in advance.
In addition, it is possible to prevent occurrence of an increase in contact resistance between the brush and the ring that occurs when resonance occurs.

  In FIGS. 7A and 7B, the gold wire brushes 4 and 23 are electrically connected to each other on the brush side, and all the gold wires are set to the same potential. Since the number of brushes in line contact with the ring peripheral surface increases, the total contact area can be increased. In addition, resonance can be suppressed by making the place where the brush is in contact with the ring circumferential surface asymmetric with respect to the vertical plane passing through the rotation axis. In addition, a plurality of contact points can be secured by changing the bending radius of the gold wire in order to suppress resonance.

(Third embodiment)
In the first embodiment and the second embodiment, the bending radius can be changed by changing the brush shape of the gold wire brush.

  FIG. 8 is a top view for explaining the gold wire brush used in the slip ring device according to the third embodiment. The above described symbols represent the same elements. Each of the gold wire brushes 26 is preliminarily formed with a bending radius substantially the same as the curvature radius of the ring outer peripheral surface. It has a curved shape that matches the curved surface of the outer peripheral surface of the ring. A plurality of stages of the gold wire brushes 26 are provided in a pair of left and right and in multiple stages. Thereby, the gold wire of the gold wire brush 26 comes into line contact with the groove portion, and the contact area can be increased.

(Fourth embodiment)
In the first to third embodiments, the shape of one of the brush side and the ring side can be changed.

  FIG. 9A is a horizontal sectional view showing a contact portion between a gold wire and a ring used in the slip ring device according to the fourth embodiment. The above described symbols represent the same thing. Of the front end portion of the gold wire 15A, the portion facing the ring outer peripheral wall of the plus electrode ring 8 is processed in advance into a concave shape or a semicircular shape. This concave or semicircular portion is a curved surface portion having a curvature matching the roundness of the ring surface of the plus electrode ring 8. A contact cross-sectional shape is previously provided on the brush side. The brush horizontal cross-sectional shape of one gold wire brush is matched with the roundness which is the shape of the other contacted part which becomes a contact partner. The contact area between the gold wire brush and the ring outer peripheral surface can be increased.

  FIG. 9B is a horizontal cross-sectional view showing another contact portion between the gold wire and the ring used in the slip ring device according to the fourth embodiment. The above described symbols represent the same thing. On the ring outer peripheral wall 27 of the plus electrode ring 8, a depression having a depression surface portion having a curvature substantially the same as the curvature of the curved surface of the gold wire 15 is processed in advance. For example, as shown in FIG. 4, one groove 14 continues to both bank portions via two inclined groove walls. A hollow surface is formed on each bank. A plurality of both bank portions are formed along the groove length direction. These both shores are located on the outermost side of the outer diameter of the rotation, and protrude most on the outer side of the diameter. Each gold wire makes line contact with the recessed surface portion formed on both bank portions.

  Since the horizontal cross-sectional shape of one ring outer peripheral wall 27 is matched with the shape (curvature) of the other contacted part which is a contact partner, the contact area between the gold wire brush and the ring outer peripheral surface can be increased. it can. You may process a hollow surface part on a ring inner peripheral wall, and you may make a brush contact.

(Fifth embodiment)
A gold contact slip ring may be used for the signal stage ring instead of the power stage ring.

  In the slip ring device according to the fifth embodiment, a groove 13 is formed on the ring outer peripheral surface of a signal stage ring (not shown) for signal transmission, and a groove 18 is formed on the inner peripheral surface of the ring. They may be provided inside and outside the signal step ring and may be in line contact with the grooves 13 and 18, respectively. The signal step ring is used by being fixed to the outer peripheral surface of the shaft body 2. The slip ring device according to the present embodiment is configured by fitting the signal stage ring and the power stage ring 3 to each other so that the inner circumferential surface of the power stage ring 3 does not contact the outer circumferential surface of the signal stage ring. Is done. Furthermore, this slip ring device is configured by combining a plurality of contact angles between the gold wire brush 4 and the inner ring surface or the outer ring surface of the signal step ring.

  Thereby, a slip ring is formed in a state in which the gold wire brush 4 and the groove on the outer peripheral wall or inner peripheral wall of the ring are in line contact. Resonance at the start / stop of rotation can be suppressed. The spark of the power stage ring can be prevented, and the instantaneous interruption in the signal stage ring can be prevented. A gold contact slip ring can be used without generating electrical noise.

  The slip ring device according to the present embodiment can also incorporate a preheating mechanism such as the heat source 28. In this way, even after the grease for lubrication is applied to the contact portion of the gold wire brush 4, even if the outside air temperature decreases, the instantaneous interruption caused by the increase in the sliding resistance value of the lubricating oil at a low temperature occurs. Does not occur. By providing the heat source 28, it is possible to take measures against instantaneous interruption in the signal stage ring. The reliability can be improved by adding a preheating mechanism to the slip ring device.

  An example in which the slip ring device according to the present embodiment having such a configuration is provided in an antenna directing device of a radar device will be described. An antenna directing device includes a fixed part fixed to a roof of a vehicle, an antenna base provided on the fixed part so as to be rotatable about a vertical axis, an antenna part provided so as to be able to be lifted and lowered on the antenna base, and an antenna base Is provided with a drive mechanism that rotates the slewing axis around the vertical axis and a transmission / reception unit that transmits and receives a high-frequency signal to and from the antenna unit. A plurality of slip ring devices or a single slip ring device including a plurality of signal stage rings is provided between the antenna unit and the transmission / reception unit. The gold contact method described in the above embodiments is used for the slip ring of the signal stage ring. When the signal transmission line is only a single system, measures can be taken in the event of an instantaneous interruption. By multiplexing the transmission lines, it can be used to construct a working transmission line and a standby transmission line.

(Other embodiments)
In the above embodiment, an example of the gold plating portions 12 and 17 of the ground electrode ring 7 and the plus electrode ring 8 has been described as the gold pattern. However, the gold pattern may be a gold film or a gold layer. A multilayer metal layer may be formed on each inner peripheral surface or each outer peripheral surface, and gold may be exposed on the outermost layer. For example, a layer of nickel or the like may be formed on a brass plate, and gold may be formed on the nickel layer.
The groove shape of the plurality of grooves 14 can be variously changed such as changing the inclination of the groove wall or making it a round groove. The number, curvature, length of the gold wires 15, the groove shapes of the grooves 14, 18 and the like can be variously changed.
In the above-described embodiment, the gold wire brush 4 of one stage is brought into contact with the ground electrode ring 7 or the plus electrode ring 8 of one stage. However, a plurality of stages of the ground electrode ring 7 or the plus electrode ring 8 of the one stage are used. The gold wire brush 4 may be brought into contact.
In the above embodiment, the ground electrode ring 7 is stacked on the plus electrode ring 8. However, the plus electrode ring 8 may be stacked on the ground electrode ring 7. For example, the ground electrode ring 7 and the plus electrode ring 8 may each be provided with a slip ring of one stage or three stages or more. The gold wire brush 4 may be opposed to the outer peripheral wall of the ground electrode ring 7, and the gold wire brush 4 may be opposed to the inner peripheral wall of the plus electrode ring 8.

  In the above embodiment, the ground electrode ring 7 is used as a ground potential and the plus electrode ring 8 is used as a plus potential. However, the combination of the potential and polarity of these two electrode rings is a minus potential, a ground potential, It may be a ground potential and a negative potential, or may be a negative potential and a positive potential, a positive potential and a negative potential, a negative potential, and a negative potential.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Slip ring apparatus, 2 ... Shaft body, 3, 21 ... Power supply stage ring, 4, 19, 25, 26 ... Gold wire brush, 5 ... Bearing, 6 ... Fixed body, 7 ... Grounding electrode ring (electrode ring), 8 ... Positive electrode ring (electrode ring), 9 ... Insulating plate, 10 ... Flange, 11, 16, 21, 23, 24 ... Brush holder, 12, 17 ... Gold plating part (gold pattern), 13 ... Non-gold plating 14, 14 ... groove, 15 ... gold wire, 20 ... cover, 27 ... ring outer peripheral wall, 28 ... heat source.

Claims (8)

A shaft body rotatably supported around the shaft;
A plurality of electrode rings, each of which is rotatably stacked on the shaft body via a gap, and has a gold pattern formed around each outer peripheral wall or each inner peripheral wall;
Provided for each of these electrode rings, each comprising a plurality of gold wire brushes having a plurality of gold wires,
A slip ring device in which a middle portion of each gold wire of these gold wire brushes contacts with the gold pattern to constitute a gold contact slip ring.   The slip ring device according to claim 1, wherein the gold wire increases a contact area between the gold wire and a surface of the electrode ring to reduce a contact voltage drop.   The slip ring device according to claim 1 or 2, wherein a concave groove is formed in the gold pattern of the electrode ring, and a cross-sectional shape of the groove is matched with a cross-sectional shape of the gold wire.   The slip ring according to claim 2, wherein the gold wire has an end portion and a curved portion, and the curved portion is bent in advance with a curvature along a curved surface of an outer peripheral wall or an inner peripheral wall of the electrode ring. apparatus.   The slip ring device according to claim 2, wherein the gold wire has an end portion and a curved portion, and the end portion is previously processed into a concave shape in accordance with the roundness of the ring surface of the electrode ring. A heat source capable of supplying preheating, or a heat storage element capable of storing heat;
The slip ring device according to claim 1, wherein the lubricant applied to the ring surface of the electrode ring is prevented from being hardened by heat from the heat source or the heat storage element.   A first gold wire brush having a plurality of gold wires each having the same first bending radius, and a second having a plurality of gold wires each having the same second bending radius different from the first bending radius. And generating a resonance due to the rotation of the plurality of electrode rings by changing the natural frequency of the first gold wire brush and the natural frequency of the second gold wire brush. The slip ring device according to claim 1, wherein the slip ring device is prevented.   8. The electrode ring according to claim 1, wherein the electrode ring is used for a signal stage ring, and the slip ring device is one signal transmission line among the signal transmission lines in which the signal transmission lines are multiplexed. The slip ring device according to any one of the above.

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