Arm for drone and drone

Abstract

To provide an arm for a drone that is configured so that wiring is prevented from being positionally shifted and cut due to impact or the like.SOLUTION: An arm for a drone, which is mounted on an enclosure of the drone, comprises a main body part whose tip has a tip portion on which another member is mounted, which is arranged outside the enclosure, and a holding part arranged in the main body part to hold wiring by which the enclosure is connected to the another member.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an arm for a drone and a drone. [Background technology]

[0002] There is known a drone having a housing in which a battery and the like are arranged, a plurality of rotors for flying the drone, and an arm for holding the rotors at a position outside and away from the housing. Patent Document 1 describes an example of using a laminated structure made of a plurality of fiber-reinforced resin sheets with woven fibers as the material for such a drone arm, and a cylindrical body obtained by molding this laminated structure into a cylindrical shape. Patent Document 1 describes that the arm obtained by molding the laminated structure is lightweight and has high rigidity. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-118530 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the drone described above, the motor for rotating the rotor is placed at the tip of the arm. The battery placed in the housing and the motor placed at the tip of the arm are connected by wiring that passes through the inside of the cylindrical arm.

[0005] In such a conventional configuration, the wiring is not fixed inside the cylindrical arm, and therefore the wiring is easily displaced due to an impact applied to the drone, and is also easily cut when pulled strongly by the impact.

[0006] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide an arm for a drone in which wiring is less likely to become misaligned or cut due to impact, etc., and a drone having such an arm for a drone. [Means for solving the problem]

[0007] One aspect of the present invention for solving the above problems relates to a drone arm as described below in [1] to [8]. [1] An arm attached to a drone housing, a main body portion disposed outside the housing and having a tip portion at a tip end to which a separate member is attached; a holding portion that is disposed in the main body portion and that holds wiring that connects the housing and the separate member, Drone arm. [2] The main body has an outer shell and a reinforcing rib arranged on the inside of the outer shell, The holding portion is formed in a part of the reinforcing rib. [1] An arm for a drone. [3] The reinforcing rib has a plurality of heights, and low height portions are formed continuously, The holding portion is formed by arranging the lower portion of the reinforcing rib along the wiring path. [2] An arm for a drone as described in the above. [4] The reinforcing rib is a plurality of plate-shaped ribs arranged to intersect with each other, The low height portion is formed at an intersection portion of the plate-like rib. [3] An arm for a drone as described in the above. [5] The reinforcing rib is integrally molded with the outer shell. The drone arm according to any one of [2] to [4]. [6] The main body has a rod-like shape with at least one surface along the longitudinal direction being open. A drone arm according to any one of [1] to [5]. [7] The main body portion is Made of fiber reinforced resin containing reinforcing fibers and thermoplastic resin. A drone arm according to any one of [1] to [6]. [8] The main body portion includes a unidirectional layer including carbon fibers oriented in one direction and a thermoplastic resin, A drone arm according to any one of [1] to [7].

[0008] Another aspect of the present invention for solving the above problem relates to a drone as described below in [9]. [9] An arm for a drone according to any one of [1] to [8]; A separate member attached to the tip portion; A housing to which the drone arm is attached; Wiring that connects the housing and the separate member and is disposed inside the drone arm and held by the holding part. Drone. Effect of the Invention

[0009] According to the present invention, there is provided an arm for a drone in which wiring is less likely to become displaced or cut due to impact, etc., and a drone having the arm for a drone. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a schematic diagram showing the appearance of a drone according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view showing the external appearance of the arm when viewed obliquely from above. [Diagram 3] FIG. 3 is a perspective view showing the external appearance of the arm when viewed from diagonally below. [Figure 4] FIG. 4 is a bottom view showing the overall configuration of the arm. [Diagram 5] FIG. 5 is a perspective view similar to FIG. 3 showing the arrangement of ribs and illustrating the external appearance of the arm as viewed from diagonally below. [Figure 6] FIG. 6 is a partial enlarged view of one of the portions indicated by dotted lines in FIG. [Figure 7] FIG. 7 is a bottom view showing how the holding portion holds the wiring. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] [First embodiment] 1 is a schematic diagram showing the appearance of a drone according to an embodiment of the present invention. The drone 100 has a housing 110, a rotor unit 120, and a plurality of arms 130 (four in this embodiment).

[0012] The housing 110 has a box-shaped lower body 112 with an open top and a box-shaped upper body 114 with an open bottom. The lower body 112 and the upper body 114 are disposed with their respective open faces facing each other and are fastened to each other with a plurality of fastening screws 116. A battery (not shown) is disposed in the space inside the housing 110 (the space between the lower body 112 and the upper body 114) formed by the above fastening. The housing 110 is a monocoque structure that maintains its strength through its walls, which reduces unnecessary parts and reduces its weight.

[0013] In this embodiment, the housing 110 is a hollow box-shaped member having a substantially square shape in plan view with four curved sides bulging outward. Mounting parts 118 for mounting the arm 130 are disposed at the four ends of the substantially square shape. The mounting part 118 is a box-shaped part protruding in the extension direction of the arm 130, and an introduction port 1182 for guiding the wiring 410 from the battery to the arm is formed on the outside of the mounting part 118. The arm 130 is attached to the mounting part 118 via a hinge 420, and can be folded downward of the housing 110 by bending the hinge 420.

[0014] The rotor units 120 are disposed at the respective tips of the four arms 130. Each rotor unit 120 has a plurality of rotors 122 (two in this embodiment) and a motor 124 for rotating the rotors 122. The motor 124 is disposed at the tip of the arm 130. A wiring 410 extending from a battery disposed in the housing 110 is connected to the motor 124. The motor 124 rotates the rotor 122 by power supplied via the wiring 410.

[0015] The arm 130 is a rod-shaped member having a shape extending linearly outward from the housing 110. The arm 130 holds the rotor unit 120 at its tip. The arm 130 creates a predetermined distance between the rotor 122 and the housing 110, and between the rotors 122 arranged on each arm 130. As a result, the arm 130 prevents the rotating rotor 122 from colliding with the housing 110, and the rotating rotors 122 from colliding with each other. The arm 130 may be bent or flexed in the middle. In this embodiment, the arm 130 extends in a direction toward the outside from the center of gravity of the housing 110, but may extend in a direction having a predetermined angle with respect to the above-mentioned outward direction.

[0016] FIG. 2 is a perspective view showing the appearance of the arm 130 when viewed from an obliquely upward direction. FIG. 3 is a perspective view showing the appearance of the arm 130 when viewed from an obliquely downward direction. As shown in FIG. 2 and FIG. 3, the arm 130 has a main body 210 attached to the outside of the housing 110, and a flange 220 arranged on the outside of the main body 210. The main body 210 has a semi-cylindrical shape with an open lower surface. A flange 220 is arranged on the lower end of the side surface of the semi-cylindrical main body 210 along the extension direction of the main body 210, toward the side surface of the main body 210.

[0017] As shown in Figures 2 and 3, the main body portion 210 has a base portion 212 for attaching the arm 130 to the housing 110, an extension portion 214 extending outside the base portion, and a tip portion 216 connected to the tip of the extension portion 214, on which the rotor unit 120 is positioned.

[0018] The base portion 212 is a portion for attaching the arm 130 to the housing 110. In this embodiment, the base portion 212 is fastened to the hinge 420 by inserting a fastening screw 222b into a fastening hole 222a formed in the flange 222, and is attached to the housing 110 via the hinge. A base wall 211 is formed on the side of the base portion 212 that contacts the housing 110. An opening 211a is formed in the base wall 211 to introduce the wiring from the attachment portion 118 into the inside of the outer shell of the base portion 212.

[0019] Extension portion 214 is a connecting portion that linearly connects base portion 212 and tip portion 216, and has a shape that narrows toward tip portion 216. Extension portion 214 also has a shape that increases in height relative to housing 110, which serves as a reference, from base portion 212 toward tip portion 216. Extension portion 214 may have a shape that is bent or refracted midway.

[0020] The tip portion 216 has a holding portion 2161 having a circular shape in a plan view for holding the rotor unit 120, and a connection portion 2162 for connecting to the extension portion 214. The tip portion 216 has a shape in which the circular surface of the holding portion 2161 is horizontal to the housing 110 and the hinge 420. The holding portion 2161 is formed with a plurality of fastening holes 2161a (four in this embodiment) for fastening the rotor unit 120. Also, the connection portion 2162 is formed with an opening 216a for leading out the wiring 410 from the inside to the outside of the arm 130.

[0021] In this embodiment, a flange 220 is disposed on each of the root portion 212, the extension portion 214 and the tip portion 216.

[0022] In this embodiment, the flange 222 disposed at the base portion 212 has a larger protruding width toward the outside of the main body portion 210 than the flanges 224 and 226 disposed at the extension portion 214 and the tip portion 216, respectively. The flange 222 disposed at the base portion 212 has fastening holes 222a (shown in FIG. 3) into which fastening screws 222b (shown in FIG. 2) are inserted for attaching the arm 130 to the housing 110 via the hinge 420. The fastening holes 222a are nut members disposed at two locations, one at the front and one at the back, of each of the flanges 222 on both sides.

[0023] 2 and 3 has a main body 210 having a top surface and a side surface, and a flange 220 extending laterally from the lower end thereof, and has a hat-shaped cross section with an open bottom surface. The flange 220 extending laterally from the main body 210 increases the second moment of area of ​​the arm 130, thereby increasing its rigidity. However, the shape of the arm 130 is not limited to this shape, and for example, a flange may be disposed on a cylindrical main body.

[0024] FIG. 4 is a bottom view showing the overall configuration of the arm 130. As shown in FIG. 3 and FIG. 4, the arm 130 has ribs 320 (ribs 322, 324, and 326) extending toward the open surface (lower surface) side inside the outer shell 310 constituting the upper surface and side surface of the main body 210 (the root portion 212, the extension portion 214, and the tip portion 216). In this embodiment, the ribs 320 are reinforcing ribs provided to increase the rigidity of the main body 210 (particularly rigidity against stress in the torsional direction). The shape of the ribs 320 is not particularly limited. In this embodiment, the ribs 320 have a shape in which two plate-shaped ribs 320a and 320b are arranged to cross each other. Each plate-shaped rib is arranged obliquely with respect to the extension direction of the arm 130 so as to linearly connect the outer shell 310 constituting one side surface and the outer shell 310 constituting the other side surface, and crosses at the center axis of the arm 130.

[0025] In the extension portion 214, the angles that the plate-like ribs 320a and 320b make with respect to the extension direction of the arm 130 change along the extension direction of the extension portion 214. Specifically, on the side of the root portion 212 where the width of the extension portion 214 is wider, the angles that the plate-like ribs make with respect to the extension direction of the arm 130 (the acute angles among the angles that they make) are made larger. On the other hand, on the side of the tip portion 216 where the width of the extension portion 214 is narrower, the angles that the plate-like ribs make with respect to the extension direction of the arm 130 (the acute angles among the angles that they make) are made smaller. In this way, the arm 130 has the ribs 320 densely arranged on the side of the root portion 212 where higher rigidity is required, and on the other hand, the ribs 320 densely arranged on the side of the tip portion 216, thereby reducing the weight of the main body portion 210.

[0026] The height of each plate-like rib (the length from the junction between the outer shell 310 constituting the top surface and the plate-like rib to the lower end of the plate-like rib) is not particularly limited, but it is preferable that it is smaller than the height of the outer shell 310 constituting the side surface (the length in a straight line along the plate-like rib from the junction between the outer shell 310 constituting the top surface and the plate-like rib to the lower end of the outer shell 310 constituting the side surface).

[0027] As shown in Figures 3 and 4, arm 130 has main body portion 210 (root portion 212, extension portion 214 and tip portion 216), flange 220 (flange 222, flange 224 and flange 226), and rib 320 (rib 322, rib 324 and rib 326) all molded as a single unit.

[0028] 4, in this embodiment, the base portion 212, the extension portion 214, and the tip portion 216 all have flanges 220 (flanges 222, 224, and 226), and all of these have ribs 320 (ribs 322, 324, and 326). However, depending on the characteristics of these portions, the flanges 220 and the ribs 320 may be formed only in some of the portions.

[0029] For example, the root portion 212 is a portion used for fastening to the housing 110. The root portion 212 is also a portion that requires rigidity to support the weight of the arm 130 and the rotor unit 120. For this reason, it is preferable that the root portion 212 has a flange 222. The flange 222 of the root portion 212 can be used as a fastening portion and can also increase the rigidity of the root portion 212. Furthermore, by using the flange 222 as a fastening portion, it is not necessary to drill holes in the main body portion 210, and a decrease in the rigidity of the main body portion 210 due to drilling can also be suppressed. On the other hand, if the rigidity can be sufficiently increased by the flange 222, the root portion 212 does not need to have the rib 322 in order to reduce the weight of the arm 130.

[0030] Furthermore, the extension portion 214 is a portion that is required to have resistance to stress in the torsional direction that occurs when the drone 100 flies. For this reason, it is preferable that the extension portion 214 has a rib 324. The rib 324 of the extension portion 214 can increase the rigidity of the extension portion 214 and suppress breakage due to stress in the torsional direction. Meanwhile, the extension portion 214 may or may not have a flange 224 depending on the aerodynamic characteristics.

[0031] Moreover, tip portion 216 is a portion that holds rotor unit 120. Tip portion 216 may or may not have flange 226 and rib 326, so long as the strength required to hold rotor unit 120 is obtained.

[0032] It should be noted that the presence or absence of flange 220 and rib 320 described above is merely an example, and it goes without saying that the arrangement of flange 220 and rib 320 can be changed depending on the characteristics (e.g., rigidity and aerodynamic characteristics) required for each portion of arm 130. For example, flange 222 may not be provided on root portion 212, and flange 224 or flange 226 may be provided on extension portion 214 or tip portion 216. Also, rib 324 may not be provided on extension portion 214, and rib 322 or rib 326 may be provided on root portion 212 or tip portion 216.

[0033] FIG. 5 is a perspective view similar to FIG. 3 showing the arrangement of the ribs and showing the appearance of the arm 130 when viewed from a diagonally lower side. FIG. 6 is a partial enlarged view of one of the parts shown by the dotted line in FIG. 5. As shown in FIG. 5 and FIG. 6, in this embodiment, the height of each plate-like rib is not constant. In other words, each plate-like rib has a plurality of heights. Specifically, the height of each plate-like rib at the intersection where they intersect is lower than the height at the position where the plate-like rib contacts the outer shell 310 constituting the side surface. The low-height portion 328a of the rib formed at the intersection is formed linearly continuously along the central axis of the arm 130 inside the outer shell 310 at the root portion 212, the extension portion 214, and the tip portion 216. This low-height portion 328a of the rib becomes a holding portion that holds the wiring in this embodiment.

[0034] Fig. 7 is a bottom view showing how the holding portion holds the wiring. Note that Fig. 7 also shows the motor 124.

[0035] The wiring 410 introduced into the inside of the base portion 212 from the opening 211a of the base wall 211 is held in a low portion 328a formed at an intersection of two plate-like ribs in the base portion 212. In this embodiment, the height of the opening 211a is the same as the height of the low portion 328a. Also, the opening 211a is disposed on the central axis of the arm 130 when the arm 130 is viewed in plan. Therefore, the wiring 410 introduced into the inside of the base portion 212 is held in the low portion 328a without bending (remaining straight).

[0036] The wiring 410 held in the low height portion 328a is held as it is (straight) without bending in the low height portion 328a formed at the intersection of the two plate-like ribs in the extension portion 214. The wiring 410 is further held as it is (straight) in a continuous manner in a plurality of low height portions 328a formed continuous to the extension portion 214.

[0037] The width of the low height portion of each of the base portion 212 and the extension portion 214 (the width in the direction connecting the side surfaces of the outer shells) is constant and coincides with the width of the wiring 410. Therefore, the wiring 410 is held by the holding portion (low height portion 328a of the rib) such that the top surface of the wiring 410 contacts the low height portion of the rib and the side surfaces of the wiring 410 contact the high height portions 328b on both sides of the low height portion.

[0038] At the connection portion 2162 of the tip portion 216, an opening 216a for taking out the wiring 410 to the outside is formed in the outer shell 310. The wiring 410 is bent at the site of the opening 216a and taken out to the outside of the outer shell 310.

[0039] In the arm 130 of this embodiment having such a configuration, the wiring 410 is fixed on the inside. Therefore, when an impact is applied to the drone 100, the wiring 410 is unlikely to be displaced or pulled, and the wiring 410 is unlikely to be cut due to these.

[0040] Moreover, the arm 130 has a body part 210 in a semi-cylindrical shape with an open lower surface. Furthermore, a part of the rib 320 is formed with a part of different height to serve as a wire holder. With such a rod-like arm 130 with at least one of the longitudinal faces being open, after the arm 130 is molded, the wire 410 can be easily fixed (fitted into the low-height part 328a) from the open face side (the lower side in this embodiment). This also makes it easy to connect the wire between the battery in the housing 110 and the motor 124 arranged at the tip part 216.

[0041] The configuration of the holding portion is not limited to the above embodiment. For example, the low-height portion of the rib may be formed along the wiring path of the wiring 410, and may be formed at a position deviated from the central axis of the arm 130 (for example, along the side surface of the arm 130), or a hole may be made in the rib and the wiring 410 may be passed through the hole to hold the wiring.

[0042] Also, another holding member for holding the wiring 410 may be disposed inside the arm 130, and the wiring 410 may be held by the holding member. This holding member may be fixed to the outer shell 310, for example, by adhesive or fastening. By using such a holding member, the wiring can be held even inside the cylindrical arm. In this case, the holding member may be inserted from the end of the cylindrical arm and fixed at a predetermined position, or an opening may be provided partially on the side surface of the cylindrical arm and the holding member may be inserted therein.

[0043] Also, another holding member for holding the wiring 410 may be disposed inside the arm 130, and the wiring 410 may be held by the holding member. This holding member may be fixed to the outer shell 310, for example, by adhesive or fastening. By using such a holding member, the wiring can be held even inside the cylindrical arm. In this case, the holding member may be inserted from the end of the cylindrical arm and fixed at a predetermined position, or an opening may be provided partially on the side surface of the cylindrical arm and the holding member may be inserted therein.

[0044] In the arm 130, the main body 210 (the root portion 212, the extension portion 214, and the tip portion 216), the flange 220 (the flange 222, the flange 224, and the flange 226), and the rib 320 (the rib 322, the rib 324, and the rib 326) are all integrally molded from a fiber-reinforced resin containing a thermoplastic resin and reinforcing fibers. By using a fiber-reinforced resin as the material, the arm 130 can be made lighter while increasing its rigidity. By using a thermoplastic resin, the arm 130 can be manufactured by a method such as press molding or injection molding, and the manufacturing efficiency is greatly improved. The thermoplastic resin may be derived from a fossil fuel, may be derived from a biomass material, or may be a mixture of these.

[0045] Examples of the thermoplastic resin include polyolefin resins such as polyethylene, polypropylene, polybutene, and poly4-methyl-1-pentene, polyamide resins, polyester resins, polystyrene resins, thermoplastic polyimide resins, polyamideimide resins, polycarbonate resins, polyphenylene ether resins, polyphenylene sulfide resins, polyacetal resins, acrylic resins, polyetherimide resins, polysulfone resins, polyether ketone resins, polyether ether ketone resins, polyarylate resins, polyether nitrile resins, vinyl chloride resins, ABS resins, and fluororesins.

[0046] Among these, polyamide resin and polyolefin resin are preferred because they are less likely to be damaged when struck by flying objects such as pebbles, and can increase the reliability of the arm 130. Furthermore, from the viewpoint of suppressing the deterioration of mechanical properties when the arm 130 absorbs water, polyolefin resin is more preferred, and polypropylene resin is even more preferred.

[0047] The thermoplastic resin may be a resin composition containing additives. Examples of the additives include known fillers (inorganic fillers, organic fillers), pigments, dyes, weather resistance stabilizers, heat resistance stabilizers, antistatic agents, antislip agents, antioxidants, antifungal agents, antibacterial agents, flame retardants, and softeners.

[0048] Examples of the reinforcing fibers include carbon fibers, glass fibers, aramid fibers, alumina fibers, silicon carbide fibers, boron fibers, and metal fibers, etc. Among these, from the viewpoint of low density, weight reduction of the arm 130, and further increase in the specific rigidity, carbon fibers and aramid fibers are preferable, and carbon fibers are more preferable.

[0049] From the viewpoint of increasing the rigidity of the arm 130, the fiber reinforced resin preferably has a unidirectional layer formed from a unidirectional sheet (UD sheet) in which reinforcing fibers (preferably carbon fibers) oriented in one direction are impregnated with a thermoplastic resin. The arm 130 may be a laminate having a plurality of unidirectional layers in which the reinforcing fibers are oriented in different directions. The arm 130 may also be a laminate having a random layer in which a plurality of sites in which the reinforcing fibers are oriented in one direction are arranged and the orientation of the reinforcing fibers differs for each of the plurality of sites, which is obtained from a random sheet obtained by randomly laying out UD sheets cut into chips and molding them. The arm 130 is preferably a laminate having two types of unidirectional layers, that is, an oriented layer in which the entire reinforcing fibers in the layer are oriented in one direction, and a random layer.

[0050] The arm 130 can be manufactured by placing a UD sheet or a random sheet pre-formed into the shape of the arm 130 in a mold and hot pressing it. According to the findings of the present inventors, by placing a random sheet on the opposite side to the rib and hot pressing it, it is also possible to manufacture an integrally molded body in which the reinforcing fibers of the random sheet are inserted into the rib, and the rib 320 also contains reinforcing fibers.

[0051] [Other embodiments] It should be noted that the above-described embodiments are merely illustrative embodiments of the present invention, and it goes without saying that the present invention can take on various modified embodiments within the scope of the technical ideas disclosed in this specification.

[0052] For example, in the above embodiment, the arm is made of fiber-reinforced resin containing thermoplastic resin and reinforcing fibers, but the arm may be made of fiber-reinforced resin containing thermosetting resin and reinforcing fibers, or may be made of metal such as aluminum or steel.

[0053] Examples of the thermosetting resin that can be used at this time include epoxy resin, phenol resin, melamine resin, urea resin, diallyl phthalate resin, silicone resin, urethane resin, furan resin, ketone resin, xylene resin, thermosetting polyimide resin, unsaturated polyester resin, and diallyl terephthalate resin.

[0054] In the above embodiment, the arm has an open bottom, but a cover for protecting the wiring may be placed on the open surface of the main body. The cover may be flat or semi-cylindrical, bulging downward. The cover may be attached by forming an opening in the flange and inserting a fastening screw into the opening, or by using an adhesive.

[0055] In the above embodiment, the main body is semi-cylindrical with a curved surface, but it may be a rod-like shape of any shape, such as a triangular prism, a square prism, a hexagonal prism, a circular cylinder, or an elliptical cylinder. In any of these shapes, at least one of the faces along the longitudinal direction may be open. On the other hand, the main body does not have to have an open face along the longitudinal direction.

[0056] In the above embodiment, the arm holds a rotor unit at its tip, but the arm may hold a component other than the rotor unit at its tip. For example, the arm may hold a robot arm, a camera, a light-emitting component (such as an LED), etc. [Industrial Applicability]

[0057] The drone arm according to the present invention is less susceptible to wiring displacement or disconnection due to impact, etc. Furthermore, the drone arm according to the present invention is easy to wire. Therefore, the drone arm according to the present invention facilitates mass production of drones. [Explanation of symbols]

[0058] 100 Drones 110 Cabinet 112 Lower Body 114 Upper Body 116 Fastening screw 118 Mounting part 1182 Introduction 120 Rotor Unit 122 rotor 124 Motor 130 Arm 210 Main body 211 Root wall 211a aperture 212 Root part 214 Extension section 216 Tip 216a aperture 2161 Holding part 2161a Fastening hole 2162 Connection 220, 222, 224, 226 flanges 222a Fastening hole 222b Fastening screw 310 Shell 320, 322, 324, 326 Ribs 320a, 320b Plate-shaped rib 328a Low height area 328b Higher part 410 Wiring 420 Hinge

Claims

1. An arm attached to a housing of a drone, a main body portion disposed outside the housing and having a tip portion at a tip end to which a separate member is attached; a holding portion that is disposed in the main body portion and that holds wiring that connects the housing and the separate member, Drone arm.

2. The main body portion has an outer shell and a reinforcing rib disposed inside the outer shell, The holding portion is formed in a part of the reinforcing rib. The drone arm according to claim 1 .

3. The reinforcing rib has a plurality of heights, and low height portions are formed continuously, The holding portion is formed by arranging the lower portion of the reinforcing rib along the wiring path. The drone arm according to claim 2.

4. The reinforcing rib is a plurality of plate-shaped ribs arranged to intersect with each other, The low height portion is formed at an intersection portion of the plate-like rib. The drone arm according to claim 3.

5. The reinforcing rib is integrally formed with the outer shell. The drone arm according to claim 2.

6. The main body has a rod-like shape with at least one surface along the longitudinal direction being open. The drone arm according to claim 1 .

7. The main body portion is Made of fiber reinforced resin containing reinforcing fibers and thermoplastic resin. The drone arm according to claim 1 .

8. The main body portion includes a unidirectional layer including carbon fibers oriented in one direction and a thermoplastic resin. The drone arm according to claim 1 .

9. A drone arm according to any one of claims 1 to 8, A separate member attached to the tip portion; A housing to which the drone arm is attached; Wiring that connects the housing and the separate member and is disposed inside the drone arm and held by the holding part. Drone.

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