Unmanned aerial vehicle tension arm

Abstract

The utility model discloses an unmanned aerial vehicle pull arm, which belongs to the technical field of unmanned aerial vehicles and comprises a pull arm arranged on an unmanned aerial vehicle body, the pull arm comprises an inner arm positioned in the middle, and the inner arm is connected with an unmanned aerial vehicle through symmetrically distributed body connectors; the two sides of the inner arm are connected with outer arms through connector assemblies correspondingly, and a tension unit is arranged at the end, away from the inner arm, of each outer arm. The unmanned aerial vehicle traction device is mainly composed of a vehicle body connecting joint, an inner arm, an outer arm and a tension unit, is installed on an unmanned aerial vehicle in the forward direction, provides tension for the unmanned aerial vehicle and achieves the traction function.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a UAV lifting arm. Background Technology

[0002] The drone arm is a component connecting the flight controller and the motors. It is typically made of high-strength materials and its main functions include supporting the motors and propellers, providing protection, balancing and stabilizing flight, and reducing vibration. In multi-rotor drones, each motor arm is equipped with a pair of motors and propellers. The direction of flight is controlled by adjusting the speed of the different motors. In drone design and manufacturing, a well-designed motor arm structure can significantly improve flight safety and reliability. Currently, most multi-rotor drone motor arms are lifting arms, using motors to drive the propellers and generate lift for takeoff, landing, and flight. To save space during transport, the motor arms are often foldable. For lighter drones, the stress on the motor arms is lower, making foldable structures easier to implement.

[0003] Chinese utility model patent application number "201520625278.8" discloses a "folding structure for a multi-rotor drone motor support arm," comprising: a drone body and a motor arm. An elastic limiting member is provided on the drone body. One end of the motor arm is movably connected to the drone body. A snap-fit ​​member is provided on the motor arm, and the elastic limiting member snaps into the snap-fit ​​member to fix the motor arm. In the fixed state, the central axis of the motor arm is set at an angle α with the drone body. A release button is provided on the motor arm, and the release button contacts the elastic limiting member. Pressing down on the elastic limiting member releases the motor arm. Through this method, the multi-rotor drone motor support arm folding structure of this utility model can achieve folding of the drone motor arm, reducing the size of the drone and facilitating transportation and storage. However, the above-described solution uses a spring as the locking and unlocking component for the motor arm, which is only suitable for lightweight multi-rotor drones. For heavy multi-rotor drones with larger loads, the motor vibration is greater, and the spring lock is prone to loosening, easily leading to drone crashes.

[0004] Based on this, this utility model proposes a drone lifting arm. Utility Model Content

[0005] The purpose of this invention is to provide a drone lifting arm to solve the problems mentioned above.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] This utility model discloses a drone lifting arm, which includes a lifting arm mounted on the drone body. The lifting arm includes an inner arm located in the middle, which is connected to the drone through symmetrically distributed body connecting joints. The two sides of the inner arm are respectively connected to an outer arm through joint assemblies, and a lifting unit is provided at the end of the outer arm away from the inner arm.

[0008] Furthermore, the body connection joint includes an integrally formed body connection hole and a tension arm connection hole, which are in a vertical position; the upper end of the body connection hole is provided with symmetrically distributed body connection edges, and the lower end of the tension arm connection hole is provided with symmetrically distributed tension arm connection edges, which are connected together by fasteners; positioning holes are symmetrically provided in the middle of the outer side wall of the tension arm connection hole, and positioning bolt assemblies are detachably installed in the positioning holes.

[0009] Furthermore, the connector assembly includes an inner connector sleeved around the outer periphery of the inner arm and an outer connector sleeved around the outer periphery of the outer arm, the inner connector and the outer connector being connected together by a snap ring assembly.

[0010] Furthermore, the inner connector has two ears and a positioning block integrally formed at the end away from the inner arm, and the two ears and the positioning block are distributed opposite each other; the outer side wall of the end of the inner connector away from the inner arm is provided with threads.

[0011] The end of the external connector away from the outer arm is integrally formed with a single ear that matches the double ears and a positioning groove that matches the positioning block.

[0012] Furthermore, the retaining ring assembly includes an outer retaining ring sleeved around the outer connector, the end of the outer retaining ring away from the outer connector being internally threaded to a thread, the end of the outer retaining ring away from the outer connector being externally threaded to an inner retaining ring, and the other end of the inner retaining ring being sleeved on the inner connector.

[0013] Furthermore, the two ears and one ear are connected together by a hinge shaft.

[0014] Furthermore, the inner connector and the inner arm, as well as the outer connector and the outer arm, are bonded together with structural adhesive.

[0015] Furthermore, the tension unit adopts a double-bladed propeller structure that is perpendicular to the outer arm.

[0016] Compared with the prior art, the beneficial technical effects of this utility model are as follows:

[0017] This utility model discloses a drone lifting arm, mainly composed of a body connecting joint, an inner arm, an outer arm, and a lifting unit. It is installed on the drone in a forward direction to provide lifting force and achieve the function of traction. The body connecting joint connects the inner arm of the lifting arm to the drone, and the lifting unit is connected to the outer arm and connected to the inner arm. The inner and outer arms can be folded. To achieve the folding function, an inner joint, an outer joint, an inner retaining ring, and an outer retaining ring are designed to connect the outer arm tube to the inner arm. The connection is ensured by a double threaded connection, which has the characteristics of small space occupation, high safety, high connection accuracy, high connection reliability, and good force bearing. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is an isometric view of the UAV tension arm of this utility model being installed on the UAV;

[0020] Figure 2 This is an isometric drawing of the pull arm of the UAV of this utility model;

[0021] Figure 3 This is an exploded view of the lever arm of the UAV of this utility model;

[0022] Figure 4 Isometric drawing of the body connection joint;

[0023] Figure 5 This is an exploded view of the outer arm;

[0024] Figure 6 Isometric view of the internal joint;

[0025] Figure 7 Isometric drawing of the external connector;

[0026] Figure 8 This is a cross-sectional view of the connection between the outer and inner arms;

[0027] Explanation of reference numerals in the attached drawings: 1. Pull arm; 11. Body connection joint; 111. Body connection hole; 112. Pull arm connection hole; 113. Pull arm connection edge; 114. Body connection edge; 115. Positioning hole; 12. Inner arm; 13. Outer arm; 131. Inner joint; 1311. Double ears; 1312. Thread; 1313. Positioning block; 132. Outer joint; 1321. Single ear; 1322. Positioning groove; 134. Inner retaining ring; 135. Outer retaining ring; 14. Pulling unit; 2. UAV. Detailed Implementation

[0028] like Figure 1-8As shown, a drone lifting arm includes a lifting arm 1 mounted on the body of a drone 2. The lifting arm 1 includes an inner arm 12 located in the middle. The inner arm 12 is connected to the drone 2 via symmetrically distributed body connection joints 11. Specifically, a carbon fiber composite cylindrical structure on the drone 2 body is fixedly connected to the inner arm 12 via the body connection joints 11. Outer arms 13 are connected to both sides of the inner arm 12 via joint assemblies. A lifting unit 14 is installed at the end of the outer arm 13 away from the inner arm 12.

[0029] The body connection joint 11 includes an integrally formed body connection hole 111 and a tension arm connection hole 112, which are in a vertical position. The upper end of the body connection hole 111 has symmetrically distributed body connection edges 114, and the lower end of the tension arm connection hole 112 has symmetrically distributed tension arm connection edges 113. Adjacent tension arm connection edges 113 and body connection edges 114 are connected together by fasteners. Positioning holes 115 are symmetrically provided in the middle of the outer side wall of the tension arm connection hole 112. Positioning bolt assemblies are detachably installed in the positioning holes 115 to ensure that the inner arm 12 is fixed in the left-right direction and cannot rotate around its axis, thus achieving precise fixation between the body connection joints on both sides and the inner arm 12. Specifically, both the tension arm connecting edge 113 and the body connecting edge 114 have slotted structures to facilitate the insertion of the carbon fiber round tubes of the inner arm 12 and the body. After insertion, the inner diameter of the slots is reduced by tightening the fasteners, thereby clamping the carbon fiber round tubes of the inner arm 12 and the body to achieve fixation.

[0030] The connector assembly includes an inner connector 131 sleeved around the inner arm 12 and an outer connector 132 sleeved around the outer arm 13. The inner connector 131 and the outer connector 132 are connected together by a retaining ring assembly. The inner connector 131 and the inner arm 12, and the outer connector 132 and the outer arm 13 are respectively bonded together with structural adhesive.

[0031] The inner connector 131, at its end away from the inner arm 12, is integrally formed with two ears 1311 and a positioning block 1313, which are oppositely distributed. A thread 1312 is installed on the outer wall of the end of the inner connector 131 away from the inner arm 12. The outer connector 132, at its end away from the outer arm 13, is integrally formed with a single ear 1321 matching the two ears 1311 and a positioning groove 1322 matching the positioning block 1313. The positioning groove 1322 has a square opening structure, and the positioning block 1313 has a cubic structure. The two ears 1311 and the single ear 1321 are connected together by a hinge shaft to ensure minimal bending moment of the force-transmitting accessory after connection. Furthermore, folding between the inner arm 12 and the outer arm 13 can be achieved by rotating the two ears 1311 and the single ear 1321 on the hinge shaft. The positioning block 1313 and the positioning groove 1322 are for quick positioning and installation of the inner arm 12 and the outer arm 13 in their extended or retracted states.

[0032] The retaining ring assembly includes an outer retaining ring 135 sleeved around the outer connector 132. The end of the outer retaining ring 135 furthest from the outer connector 132 is internally threaded to a thread 1312. The inner sidewall of the end of the outer connector 132 furthest from the thread 1312 has an inwardly protruding annular structure, and the outer sidewall of the outer connector 132 has an outwardly protruding annular structure. When the outer retaining ring 135 is connected to the thread 1312, the inwardly protruding annular structure and the outwardly protruding annular structure contact each other, cooperating with the threaded connection to fix the inner connector 131 and the outer connector 132. The end of the outer retaining ring 135 furthest from the outer connector 132 is externally threaded to an inner retaining ring 134. The other end of the inner retaining ring 134 is sleeved on the inner connector 131, and its inner sidewall also has an inwardly protruding annular structure, which cooperates with the outwardly protruding annular structure on the outer sidewall of the inner connector 131 to fix the outer retaining ring 135.

[0033] The tension unit 14 adopts a double-bladed propeller structure that is perpendicular to the outer arm 13. The motor in the tension unit 14 drives the propeller to rotate, generating tension. The tension is transmitted to the outer arm 13, and then transmitted to the inner arm 12 through the connector. The body connection connector 11 fixes the inner arm to the body of the UAV 2. The tension generated by the tension units 14 on both sides will generate a large bending moment on the tension arm. The bending moment is self-balanced in the inner arm 12. Only the shear force is transmitted to the body through the body connection connector 11, which makes it better in terms of stress distribution and more friendly to the body structure.

[0034] The inner connector 131, outer connector 132, inner retaining ring 134 and outer retaining ring 135 are all aluminum alloy parts. The material in this example is 7050-T7451.

[0035] The operation process of this utility model is as follows:

[0036] Insert the inner arm 12 into the tension arm connection hole 112 through the body connection joint 11, insert the round tube structure on the body into the body connection hole 111, and then tighten and fix the tension arm connection edge 113 and the body connection edge 114 respectively through fasteners.

[0037] With the tension arm straightened: First, the inner connector 131 is bonded to the inner arm 12, and the outer connector 132 is bonded to the outer arm 13; then, the double ears 1311 on the inner connector 131 and the single ear 1321 on the outer connector 132 are hinged together by a hinge shaft, and the positioning block 1313 is snapped into the positioning groove 1322, so that the inner arm 12 and the outer arm 13 are connected in a straight line; finally, the outer retaining ring 135 is threadedly fixed to the thread 1312 on the inner connector 131, and the inner retaining ring 134 is threadedly connected to the external thread on the outer retaining ring 135, so as to fix the inner arm 12 and the outer arm 13.

[0038] Folded state of the tension arm: In the straightened state, first release the inner retaining ring 134 from fixing the outer retaining ring 135, then release the outer retaining ring 135 from fixing the inner connector 131, and finally, rotate the double ears 1311 or the single ear 1321 around the hinge shaft, so that the positioning block 1313 disengages from the positioning groove 1322, and the inner arm 12 and the outer arm 13 are in the folded state.

[0039] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A drone lifting arm, characterized in that: The device includes a tension arm (1) mounted on the body of the drone (2). The tension arm (1) includes an inner arm (12) located in the middle. The inner arm (12) is connected to the drone (2) through symmetrically distributed body connection joints (11). The two sides of the inner arm (12) are respectively connected to an outer arm (13) through joint assemblies. A tension unit (14) is provided at the end of the outer arm (13) away from the inner arm (12).

2. The UAV lifting arm according to claim 1, characterized in that: The body connection joint (11) includes an integrally formed body connection hole (111) and a tension arm connection hole (112), which are in a vertical position. The upper end of the body connection hole (111) is provided with symmetrically distributed body connection edges (114), and the lower end of the tension arm connection hole (112) is provided with symmetrically distributed tension arm connection edges (113). Adjacent tension arm connection edges (113) and body connection edges (114) are connected together by fasteners. The middle position of the outer side wall of the tension arm connection hole (112) is provided with symmetrically distributed positioning holes (115), and a positioning bolt assembly is detachably provided in the positioning hole (115).

3. The UAV lifting arm according to claim 1, characterized in that: The connector assembly includes an inner connector (131) sleeved around the outer periphery of the inner arm (12) and an outer connector (132) sleeved around the outer periphery of the outer arm (13), the inner connector (131) and the outer connector (132) being connected together by a snap ring assembly.

4. The UAV lifting arm according to claim 3, characterized in that: The inner connector (131) has a double ear (1311) and a positioning block (1313) integrally formed at the end away from the inner arm (12), and the double ear (1311) and the positioning block (1313) are distributed opposite to each other; the outer side wall of the end of the inner connector (131) away from the inner arm (12) is provided with a thread (1312); The end of the external connector (132) away from the outer arm (13) is integrally formed with a single ear (1321) that matches the double ears (1311) and a positioning groove (1322) that matches the positioning block (1313).

5. The UAV lifting arm according to claim 4, characterized in that: The retaining ring assembly includes an outer retaining ring (135) sleeved around the outer connector (132), the end of the outer retaining ring (135) away from the outer connector (132) being internally threaded to a thread (1312), and the end of the outer retaining ring (135) away from the outer connector (132) being externally threaded to an inner retaining ring (134), the other end of the inner retaining ring (134) being sleeved on the inner connector (131).

6. The UAV lifting arm according to claim 4, characterized in that: The two ears (1311) and the single ear (1321) are connected together by a hinge shaft.

7. The UAV lifting arm according to claim 3, characterized in that: The inner connector (131) and inner arm (12) are bonded together with structural adhesive, as are the outer connector (132) and outer arm (13).

8. The UAV lifting arm according to claim 1, characterized in that: The tension unit (14) adopts a double-bladed propeller structure that is perpendicular to the outer arm (13).

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