JP2018152334A - Rotary connector and rotary wing support device for drone using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary connector capable of stably transmitting electric power or an electric signal in a non-contact manner between a fixed side and a rotating side in a rotating element.SOLUTION: A rotary connector (1) includes: a conductive shaft (2); a bearing (3) rotatably supporting the shaft (2); and a housing (4) having the bearing (3) and an electrode part (11) at least at a position opposing to an end face of the shaft (2). The shaft (2) and the housing (4) are isolated from each other. The end face of the shaft (2) and the electrode part (11) of the housing (4) are opposed each other through an insulation fluid with higher inductivity than that of air and are capacity-coupled to transmit an AC current or an AC signal. The bearing (3) is a dynamic bearing, for example.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotary connector that transmits electric power and electrical signals at a rotating part, and a rotary blade support device for an unmanned aircraft using the rotary connector.

  In a rotary wing drone equipped with a rotary wing such as a drone or a radio controlled helicopter, it is considered to mount a GPS antenna on the rotary wing and fly autonomously while obtaining position information. Further, in machine tools, it has been studied to install a sensor in a rotating part of a rotary tool so that an operation state can be grasped.

  Conventionally, for transmission of electric power and electric signals between a fixed body and a rotating body, a slip ring using a brush, a rotary connector using a liquid metal such as mercury (for example, Patent Document 1), and a power transmission component such as a photocoupler. Is being used. In the rotary connector of Patent Document 1, the rotation-side electrode and the fixed-side electrode are opposed to each other at one end, and a liquid metal is interposed in the gap between the rotation-side electrode and the fixed-side electrode to make the energization state.

  In addition, for example, there are Patent Documents 2 to 4 as technical documents related to transmission of electric power and electric signals in the rotating unit. The power supply system of Patent Document 2 transmits power between a rotating body and a stationary body that rotate relative to each other without contact with each other. Patent Document 3 describes a capacitive coupling (capacitor) using a coaxial cable structure as a conventional example of a rotary joint. The rotary repeater disclosed in Patent Document 4 transmits an ultra-high frequency signal by capacitively coupling the center conductor of the fixed body and the center conductor of the rotor.

International Publication No. 2016/136414 International Publication No. 2016/010145 Japanese Patent No. 40475504 Japanese Patent No. 2824822

  The conventional parts for electric transmission have the following problems. The slip ring generates noise due to wear of the brush and sliding contact between the ring and the brush. A rotary connector using a liquid metal uses a contact rubber sheet for sealing the liquid metal, and therefore has a large rotational torque and a narrow operating temperature range. Further, when the liquid metal is mercury, the environmental load is large. The photocoupler has a low efficiency because it needs to convert an electric signal into light once and convert it again into an electric signal at the light receiving unit. Moreover, since time is required for conversion, it cannot be applied to transmission of high-frequency signals. In addition, the one that performs the capacitive coupling is not sufficiently stable in transmission.

An object of the present invention is to provide a rotary connector that can stably transmit electric power and electric signals in a non-contact manner between a fixed side and a rotating side in a rotating part.
Another object of the present invention is to provide a drone support device for an unmanned aerial vehicle capable of accurately transmitting a GPS signal received by a GPS antenna provided on a flight rotor to a GPS signal processing means. .

The rotary connector according to the present invention includes a conductive shaft, a bearing that rotatably supports the shaft, and a housing having an electrode portion at a location where the bearing is installed and facing at least an end surface of the shaft,
The shaft and the housing are insulated, and the end surface of the shaft and the electrode portion of the housing are opposed to each other via an insulating fluid having a dielectric constant higher than that of air, and can transmit an alternating current or an alternating current signal. Are capacitively coupled.
The rotary connector has at least two electrodes, one of which is the shaft and the other electrode is the electrode portion of the housing.

  According to this configuration, the shaft and the housing are rotatable with respect to each other, the shaft that is one electrode and the electrode portion of the housing that is the other electrode are capacitively coupled, and the facing portion between the shaft and the electrode portion of the housing is a capacitor. Function as. When electric power or an electric signal is input to the electrode portion of the shaft or the housing, the electric power or electric signal is transmitted from the shaft to the electrode portion of the housing or from the electrode portion of the housing to the shaft. By making the end face of the shaft and the electrode portion of the housing face each other via an insulating fluid having a dielectric constant higher than that of air, a larger capacitance can be obtained than in the case of insulating with air. Thereby, electric power and an electric signal can be stably transmitted between a shaft and a housing without contact.

  Since the electrode on the housing side is a part of the housing, an insulating fluid can be easily enclosed between the end face of the shaft and the electrode portion of the housing without adopting a complicated sealing structure. Thereby, simplification of the whole can be achieved.

  In the present invention, the end portion of the shaft including the end surface may have a flange shape having an outer diameter larger than that of other portions of the shaft. When the end portion of the shaft is in a flange shape, the capacitance of the facing portion between the shaft and the electrode portion of the housing is increased, and the transmission capability of electric power and electric signals is further increased.

  In this invention, the bearing may be a dynamic pressure bearing. The hydrodynamic bearing has characteristics that it has a long life and is quiet. This excellent characteristic is obtained as a rotary connector.

  In the dynamic pressure bearing, the fluid that transmits rotation may be the insulating fluid. In this case, there is no trouble caused by the mixed flow of the fluid interposed between the end face of the shaft and the electrode portion of the housing and the fluid of the hydrodynamic bearing, and the configuration for preventing the mixed flow is simplified.

  For example, ester oil is used as the insulating fluid. Since ester oil is excellent in thermal stability, it is suitable for use in a rotary connector that may be hot.

  A rotating blade support device for an unmanned aerial vehicle according to the present invention is a device for supporting a flying rotor blade in a rotating blade unmanned aircraft, and includes a shaft of a rotor having the rotating blade, and a bearing that rotatably supports the shaft. A housing that supports the bearing, the shaft is electrically conductive, the housing has an electrode portion at a position facing an end surface of the shaft, the GPS antenna is disposed on the rotor, and the housing or the housing is disposed on the rotor. Each of the fixed members is provided with GPS signal processing means, and the rotary connector is configured with the shaft, the bearing, and the housing as components, and the GPS antenna and the GPS signal processing means are electrically connected via the shaft. It is connected to the.

  The drone support device for an unmanned aerial vehicle having this configuration is normally used in a posture in which the GPS antenna is located above the rotor blade and the GPS signal processing means is located below the rotor blade. In this normal posture, the GPS antenna receives the GPS signal from the artificial satellite. The received GPS signal is transmitted to the GPS signal processing means through the shaft and the electrode part of the housing in order. The GPS signal processing means processes the GPS signal to obtain position information. Using the obtained position information, a rotary wing drone equipped with a drone support device for autonomous drone performs autonomous flight.

  Conventional rotary-wing drones equipped with rotary wings such as drones and radio controlled helicopters are generally provided with rotary wings at the top of the fuselage. For this reason, if a GPS antenna is provided in the body of the airframe, the rotor blades become a shield and cannot receive GPS signals accurately. On the other hand, the GPS signal from the artificial satellite can be accurately received by installing the GPS antenna on the opposite side of the GPS signal processing means, that is, on the upper side of the rotor blade, with the rotor blade interposed therebetween. . Then, by transmitting the GPS signal along the shaft, it can be sent to the GPS signal processing means with high accuracy without being affected by the rotation of the rotor blades.

  The above-described rotor blade support device for an unmanned aerial vehicle has a compatible GPS signal frequency range of about 1 GHz or more and about 2 GHz or less. For example, in the rotary connector used for the unmanned aerial vehicle rotary wing support device of the flying device, it was confirmed that the compatible GPS signal frequency range was about 1 GHz or more and about 2 GHz or less. In the frequency band within this range, the rotary connector can be mounted on a drone support device for an unmanned aerial vehicle and used for receiving and processing GPS signals.

  A rotary connector according to the present invention includes a conductive shaft, a bearing that rotatably supports the shaft, and a housing that is provided with the bearing and has an electrode portion at least at a position facing an end surface of the shaft. And the housing are insulated, and the end face of the shaft and the electrode portion of the housing are opposed to each other through an insulating fluid having a dielectric constant higher than that of air, and are capable of transmitting an alternating current or alternating current signal. Since they are coupled, it is possible to stably transmit power and electric signals in a non-contact manner between the fixed side and the rotating side of the rotating unit.

  A rotating blade support device for an unmanned aerial vehicle according to the present invention is a device for supporting a flying rotor blade in a rotating blade unmanned aircraft, a bearing that supports a shaft of a rotor having the rotating blade, and a housing that supports the bearing The shaft is electrically conductive, the housing has an electrode portion at a position facing the end surface of the shaft, a GPS antenna is provided on the rotor, and a GPS signal is provided on the housing or a member to which the housing is fixed. Each of the processing means is provided, the rotary connector is configured with the shaft, the bearing, and the housing as components, and the GPS antenna and the GPS signal processing means are electrically connected via the shaft. The GPS signal received by the GPS antenna provided on the flying rotor wing can be accurately transmitted to the GPS signal processing means.

It is sectional drawing of the rotary connector which concerns on 1st Embodiment of this invention. It is sectional drawing of the rotary connector which concerns on 2nd Embodiment of this invention. It is sectional drawing of the rolling bearing used for the rotary connector which concerns on 3rd Embodiment of this invention. It is sectional drawing of the rotary blade support apparatus for unmanned aircraft using the rotary connector which concerns on 1st Embodiment. It is a graph which shows the actual measurement result of the transmission characteristic in the stop state of the rotary connector which concerns on 1st Embodiment. It is a graph which shows the measurement result of the transmission characteristic at the time of the rotation speed 1000r / min of the rotary connector which concerns on 1st Embodiment. It is a graph which shows the measurement result of the transmission characteristic at the time of the rotation speed 2000r / min of the rotary connector which concerns on 1st Embodiment. It is a graph which shows the actual measurement result of the transfer characteristic at the time of the rotation speed 3000r / min of the rotary connector which concerns on 1st Embodiment.

An embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a cross-sectional view of the rotary connector according to the first embodiment. The rotary connector 1A includes a shaft 2, a bearing 3A that rotatably supports the shaft 2, and a housing 4 in which the bearing 3A is installed. The bearing 3A is a combined fluid bearing having a radial bearing portion 5 and a thrust bearing portion 6, and is, for example, a dynamic pressure bearing. The radial bearing portion 5 and the thrust bearing portion 6 are both dynamic pressure bearings.

  The shaft 2 has a shaft portion 7 extending in the vertical direction in FIG. 1 and a flange portion 8 formed at the lower end of the shaft portion 7. That is, the end portion of the shaft 2 including the end surface of the shaft 2 is formed in a flange shape having a larger outer diameter than other portions of the shaft 2. The upper portion of the shaft portion 7 projects upward from the housing 4. The shaft portion 7 is provided with large-diameter portions 7a having a slightly larger outer diameter than other portions at a plurality of locations (two locations in the illustrated example) separated in the axial direction. Further, a concave portion 8b is provided in the central portion of the lower surface 8a of the flange portion 8. A lower surface 8 a of the flange portion 8 is an end surface of the shaft 2. The shaft 2 is made of a conductive material such as metal. However, the shaft 2 does not necessarily have to be conductive as a whole, and only the surface may be conductive.

  The housing 4 includes a cylindrical housing body 10, a thrust bush 11 disposed so as to close the bottom of the housing body 10, and a dynamic pressure sleeve 12 disposed on the inner periphery of the housing body 10. An annular convex portion 11 a is provided on the upper surface of the thrust bush 11. The housing body 10 may be conductive or non-conductive. The thrust bush 11 is made of a conductive material, for example, metal, and forms an electrode portion of the housing 10. The dynamic pressure sleeve 12 is made of an oil-impregnable material such as a sintered metal. Further, on the upper side of the dynamic pressure sleeve 12, a ring-shaped seal washer 13 that closes a gap between the shaft portion 7 of the shaft 2 and the housing body 10 is provided.

  The outer peripheral surface of the shaft portion 7 of the shaft 2 is opposed to the inner peripheral surface of the dynamic pressure sleeve 12 through a narrow gap. A portion of the dynamic pressure sleeve 12 facing the large diameter portion 7 a of the shaft portion 7 is the radial bearing portion 5. Further, the convex portion 11 a of the thrust bush 11 facing the lower surface of the flange portion 8 of the shaft 2 is the thrust bearing portion 6. When the shaft 2 is stationary, the shaft 2 is supported on the thrust bush 11 by its own weight.

  The radial bearing portion 5 and the thrust bearing portion 6, which are dynamic pressure bearings, are of a type having a herringbone groove (not shown), for example, and a dynamic pressure applying fluid is sealed inside the housing 4. In this example, the insulating fluid 14 is used as the dynamic pressure applying fluid. The insulating fluid 14 is also a fluid for insulating the lower surface 8 a of the flange portion 8 that is the end surface of the shaft 2 and the thrust bush 11 of the cylindrical housing body 10 of the housing 4.

  The insulating fluid 14 is made of a fluid having a dielectric constant higher than that of air. For example, ester oil is used. Since ester oil is excellent in thermal stability, it is suitable for use in a rotary connector that may be hot. The insulating fluid 14 may be oil such as mineral oil other than ester oil, or grease based on these oils.

  The operation of the rotary connector 1A will be described. When the shaft 2 rotates, the dynamic bearing pressure of the insulating fluid 14 supports the flange portion 8 of the shaft 2 in a state of floating from the thrust bush 11 in the thrust bearing portion 6, and the shaft portion of the shaft 2 in the radial bearing portion 5. 7 is supported so as to be located at the center of the inner periphery of the dynamic pressure sleeve 12. As a result, the shaft 2 can rotate with low torque and quietly, and can be used with high load and high speed rotation.

  In this rotary connector 1A, the shaft 2 and the housing 4 are insulated, and the lower surface of the flange portion 8 that is the end surface of the shaft 2 and the thrust bush 11 that is the electrode portion of the housing 4 are opposed to each other via the insulating fluid 14. doing. With this configuration, the shaft 2 that is the rotating electrode and the thrust bush 11 of the housing 4 that is the fixed electrode are capacitively coupled, and the opposing portion of the shaft 2 and the thrust bush 11 functions as a capacitor. For this reason, it is possible to transmit an alternating current or an alternating signal between the shaft 2 and the thrust bush 11. That is, when electric power or an electric signal is input to the shaft 2 or the thrust bush 11, the electric power or electric signal is transmitted from the shaft 2 to the thrust bush 11 or from the thrust bush 11 to the shaft 2.

  By making the shaft 2 and the thrust bush 11 face each other via an insulating fluid 14 having a dielectric constant higher than that of air, a larger capacitance can be obtained as compared with the case of insulating with air. For this reason, electric power and an electric signal can be stably transmitted between the shaft 2 and the thrust bush 11 in a non-contact manner.

  Further, since the thrust bush 11 that is the electrode portion of the housing 4 is a part of the housing 4, the insulating fluid 14 is allowed to flow between the end face of the shaft 2 and the thrust bush 11 without adopting a complicated sealing structure. Can be easily encapsulated. Furthermore, since this insulating fluid 14 is used as a fluid pressure imparting fluid for the bearing 3A, which is a fluid dynamic bearing, there is no hindrance due to the mixed flow of the fluid interposed between the shaft 2 and the thrust bush 11 and the fluid of the fluid dynamic bearing, thereby preventing the mixed flow. The configuration for is simplified. From these things, simplification of the rotary connector 1A whole can be achieved.

  When the bearing 3A is a dynamic pressure bearing as in this embodiment, the space between the shaft 2 and the dynamic pressure sleeve 12 also functions as a capacitor. Since the facing area between the shaft 2 and the dynamic pressure sleeve 12 is larger than the facing area between the shaft 2 and the thrust bush 11, the capacitor formed between the shaft 2 and the dynamic pressure sleeve 12 is between the shaft 2 and the thrust bush 11. Capacitance is larger than the capacitor. Further, it is desirable that the housing body 10 is also at least surface conductive. In that case, the opposing part of the shaft 2 and the housing body 10 also functions as a capacitor, the electrostatic capacity is further increased, and the transmission capability of electricity and electrical signals can be further increased.

[Second Embodiment]
FIG. 2 is a cross-sectional view of the rotary connector according to the second embodiment. The rotary connector 1B is different from the rotary connector 1A in that the bearing is a rolling bearing. A bearing 3 </ b> B that is a rolling bearing includes an inner ring 21 that fits on the outer periphery of the shaft portion 7 of the shaft 2, an outer ring 22 that fits on the inner periphery of the housing body 10 of the housing 4, and an inner ring 21 and an outer ring 22. An intervening rolling element 23 and a seal member 24 that seals the space between the inner ring 21 and the outer ring 22 are provided. In this example, the rolling elements 23 are balls, and the bearing 3B is configured as a deep groove ball bearing as a whole.

  Since the bearing 3B is a rolling bearing, the dynamic pressure sleeve 12 and the seal washer 13 are omitted. In addition, since the dynamic pressure applying fluid required for the dynamic pressure bearing is unnecessary, in this rotary connector 1B, only the gap between the shaft 2 and the thrust bush 11 is filled with the insulating fluid 14. . In the case of this rotary connector 1B, the shaft 2 and the thrust bush 11 are always opposed to each other via a gap. The type of the insulating fluid 14 is the same as described above.

  In the rotary connector 1B, similarly to the rotary connector 1A, the shaft 2 and the thrust bush 11 are capacitively coupled, and the opposing portion of the shaft 2 and the thrust bush 11 functions as a capacitor. For this reason, it is possible to transmit an alternating current or an alternating signal between the shaft 2 and the thrust bush 11.

[Third Embodiment]
FIG. 3 is a cross-sectional view showing a rolling bearing used in a rotary connector according to the third embodiment. This embodiment is different from the second embodiment only in the type of bearing used, and other configurations are the same, so only the bearing will be described, and detailed description of the other configurations will be omitted. . In this rotary connector, a combination angular contact ball bearing is used as the bearing 3C instead of the rolling bearing used in the second embodiment. The bearing 3C, which is an angular ball bearing, includes an inner ring 26 that fits on the outer periphery of the shaft portion of the shaft, an outer ring 27 that fits on the inner periphery of the housing body of the housing, and a roller interposed between the inner ring 26 and the outer ring 27. The moving body 28 and the holder | retainer 29 holding each rolling element 28 are provided. The bearing 3 </ b> C may further include a seal member that seals a space between the inner ring 26 and the outer ring 27. This combination angular contact ball bearing 3C is configured as a back combination angular contact ball bearing.

[Rotating blade support device for drone]
FIG. 3 is a cross-sectional view of the rotary blade support device 30 for the unmanned aircraft using the rotary connector 1A (FIG. 1). This unmanned aerial vehicle rotary blade support device 30 is used to support a rotary vane drone, for example, a drone rotary vane.

  The housing 4 of the rotary connector 1A is fixedly provided on the body frame 31 of the rotary blade unmanned aircraft, and the rotary blade 32 is attached to the shaft 2 of the rotary connector 1A. The body frame 31 is a member to which the housing 4 of the rotary connector 1A is fixed. The rotary blade 32 is obtained by attaching a plurality of blades 34 to a rotor 33, and the rotor 33 is fixed to the shaft 2 so as to be integrally rotatable.

  An outer rotor type motor 35 coaxial with the shaft 2 of the rotary connector 1 </ b> A is installed on the body frame 31. The motor 35 is installed in a state of ensuring insulation from the rotary connector 1A. A rotating member 35 b fixed to the motor rotor 35 a of the motor 35 is coupled to the rotor 33 of the rotating blade 32. Electric power is supplied to the motor 35 from a power source (not shown) via an electric wire 36. Thereby, when the motor rotor 35a rotates, the rotary blade 32 rotates.

  A GPS antenna 37 is installed on the rotor 33. The GPS antenna 37 is installed on the rotor 33 so as to rotate integrally with the rotor blade 32. The GPS antenna 37 is electrically connected to the shaft 2 of the rotary connector 1A. In addition, GPS signal processing means 38 is installed in the body frame 31. The GPS signal processing unit 38 is a unit that processes the GPS signal and generates position information, for example. The GPS signal processing means 38 is electrically connected to the thrust bush 11 of the rotary connector 1A. In this way, the GPS antenna 37 and the GPS signal processing means 38 are provided so as to be located on opposite sides of the rotary blade 32 in the axial direction of the shaft 2.

  Further, a ground line 40 is connected to the GPS antenna 37. The ground line 40 is connected to a ring-shaped ground electrode 41 provided on the rotor 33. The ground electrode 41 is opposed to the body frame 31 through a narrow gap. The air, which is an insulating material, is interposed in the gap, so that the facing portion between the ground electrode 41 and the body frame 31 functions as a capacitor, and the GPS antenna 37 is grounded to the body frame 31.

This rotary wing drone normally flies in a posture in which the rotary wing 32 is positioned above the body frame 31. That is, the GPS antenna 37 is located above the rotor blade 32 and the GPS signal processing means 38 is located below the rotor blade 32. In this normal flight posture, the GPS antenna 37 receives the GPS signal from the artificial satellite. The received GPS signal is sent to the GPS signal processing means 38 through the shaft 2 of the rotary connector 1A and the thrust bush 11 in order. GP
The GPS signal is processed by the S signal processing means 38, and autonomous flight is performed using the obtained position information.

  Conventional rotary-wing drones equipped with rotary wings such as drones and radio controlled helicopters are generally provided with rotary wings at the top of the fuselage. For this reason, if a GPS antenna is provided in the body of the airframe, the rotor blades become a shield and cannot receive GPS signals accurately. On the other hand, the GPS signal from the artificial satellite can be accurately obtained by installing the GPS antenna 37 on the opposite side of the GPS signal processing means 38, that is, on the upper side of the rotary wing 32 with the rotary wing 32 interposed therebetween as in this embodiment. Can be received. Then, by transmitting the GPS signal to the lower side of the rotary blade 32 through the shaft 2, the GPS signal can be sent to the GPS signal processing means 38 with high accuracy without being influenced by the rotation of the rotary blade 32.

  For example, 1 to 8, preferably 2 to 6, more preferably 3 to 4 are mounted on a flying device such as a drone or a radio controlled helicopter. The When the unmanned aerial vehicle rotor support device 30 fewer than the above number is mounted on the flying device, for example, it becomes difficult to exhibit a stable flight capability during the flight of the flying device. When the unmanned aerial vehicle rotor support device 30 larger than the above number is mounted on the flying device, for example, the weight of the entire flying device increases, which is not preferable. However, the number of unmanned aerial vehicle rotary wing support devices 30 mounted on the flying device is not limited to the above example, and may be nine or more.

The transmission characteristics of the rotary connector 1A will be described with reference to FIGS.
5 to 8 are graphs showing results of actually measuring transmission characteristics at various rotational speeds for the rotary connector 1A described in the first embodiment. The horizontal axis of these graphs indicates frequency (GHz), and the vertical axis indicates transmission loss (dB). In the measurement charts shown in FIGS. 5 to 8, it is determined that the transmission loss value is close to 0 dB, the transmission loss is small, and excellent transmission characteristics are exhibited.

  From the actual measurement results shown in FIG. 5 to FIG. 8, the rotary connector 1 </ b> A is, for example, a signal having a frequency in the range of about 1 GHz or more and about 2 GHz or less, preferably about 1.1 GHz or more and about 1.6 GHz or less. It can be seen that it is possible to cope well when signals are used. Therefore, for example, in the rotary connector 1A used for the unmanned aerial vehicle rotary wing support device 30 of the flying device, at least about 1 GHz and about 2 GHz or less, preferably about 1.1 GHz or more and about 1.6 GHz or less. It was confirmed that GPS signals with a range of frequencies could be used. Thus, the rotary connector 1A can be mounted on the unmanned aerial vehicle rotary blade support device 30 and used for receiving and processing GPS signals. However, the frequency of the GPS signal that can be used by the rotary connector 1A and the rotary blade support device 30 for an unmanned aircraft including the rotary connector 1A is not limited to the above range.

  As mentioned above, although the form for implementing this invention based on embodiment was demonstrated, embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1A, 1B ... Rotary connector 2 ... Shaft 3A, 3B ... Bearing 4 ... Housing 5 ... Radial bearing part 6 ... Thrust bearing part 8 ... Flange part (shaft end part)
8a ... Lower surface (shaft end surface)
11. Thrust bush (housing electrode part)
DESCRIPTION OF SYMBOLS 14 ... Insulating fluid 30 ... Rotor blade support apparatus 32 for unmanned aircraft ... Rotor blade 37 ... GPS antenna 38 ... GPS signal processing means

Claims (7)

A conductive axis;
A bearing that rotatably supports the shaft;
A housing having the electrode portion at a location where the bearing is installed and facing at least the end face of the shaft;
With
The shaft and the housing are insulated, and the end surface of the shaft and the electrode portion of the housing are opposed to each other via an insulating fluid having a dielectric constant higher than that of air, and can transmit an alternating current or an alternating current signal. Capacitively coupled to the
Rotary connector.   2. The rotary connector according to claim 1, wherein an end portion of the shaft including the end surface has a flange shape having a larger outer diameter than other portions of the shaft.   The rotary connector according to claim 1 or 2, wherein the bearing is a dynamic pressure bearing.   The rotary connector according to claim 3, wherein the fluid that transmits the rotation of the hydrodynamic bearing is the insulating fluid.   The rotary connector according to claim 4, wherein the insulating fluid is ester oil. A device for supporting a rotary wing for flight in a rotary wing drone,
A rotor shaft having the rotor blades;
A bearing that rotatably supports the shaft;
A housing that supports the bearing;
With
The shaft is conductive;
The housing has an electrode portion at a position facing the end surface of the shaft,
The rotor is provided with a GPS antenna,
GPS signal processing means is provided in the housing or a member to which the housing is fixed,
The rotary connector according to any one of claims 1 to 5 is configured with the shaft, the bearing, and the housing as components, and the GPS antenna and the GPS signal processing means are electrically connected via the shaft. It is connected to the,
Rotor support device for drone.   7. The drone support device for an unmanned aerial vehicle according to claim 6, wherein the frequency range of the GPS signal that can be handled is about 1 GHz or more and about 2 GHz or less.

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