A machine arm rotating shaft and a unmanned aerial vehicle
By designing the arm pivot, and utilizing the elastic meshing of sliding and rotating cams, the problem of interference between the motor propeller and the adjacent arm after the drone arm is folded is solved, achieving compact arm storage and overall miniaturization, thus improving portability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN SAIJIN TECH CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-07-07
AI Technical Summary
When existing drone arms are horizontally rotated and folded, the end motors and propellers are prone to interference with adjacent arms, making it impossible to store them tightly and affecting portability.
The design incorporates a rotating arm shaft, including a fixed housing, a sliding cam, a rotating cam, and an elastic element. The positioning and rotation of the rotating arm are achieved through the elastic engagement of the boss and the recess, ensuring that the motor and propeller avoid collisions. The elastic element also enables automatic reset, simplifying operation.
The arms are compactly stored on the side of the fuselage, minimizing the overall size of the machine, improving user portability, and avoiding interference between the motor propeller and the adjacent arms.
Smart Images
Figure CN224466153U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to an arm pivot and a UAV. Background Technology
[0002] Drones, especially multi-rotor drones, are widely used in aerial photography, surveying, logistics, and inspection due to their flexibility, maneuverability, and ease of operation. These drones typically consist of a central fuselage and multiple arms extending horizontally outwards from it, with each arm equipped with a drive motor and propeller. Improving portability, facilitating user carrying and storage, and minimizing the overall space occupied by the drone are key design goals.
[0003] To facilitate storage and portability, existing technologies generally design the arms as structures that can rotate and fold horizontally around the fuselage, reducing the overall size by folding the arms towards the fuselage. However, this simple horizontal rotation and folding method has significant drawbacks: when the arms are folded, the motors and propellers at their ends can easily interfere with the adjacent arms, preventing the arms from being tightly and smoothly stored to the side of the fuselage. This interference problem severely limits the minimum space occupied by the folded arms, making it difficult to further optimize the overall storage volume and ultimately affecting the user's portability. Therefore, improvements are urgently needed. Utility Model Content
[0004] The main purpose of this invention is to propose an arm pivot to solve the problem in related technologies that the drone arm cannot be tightly stored to the side of the fuselage after horizontal rotation and folding.
[0005] To achieve the above objectives, this utility model proposes a boom pivot, the boom pivot comprising:
[0006] A fixed housing is connected to a fixed arm, and the fixed housing has a sliding channel with one end open;
[0007] A sliding cam is slidably mounted in the sliding channel, and a boss is provided at the end of the sliding cam facing the opening of the sliding channel;
[0008] A rotating cam is connected to a rotating arm. The rotating cam is rotatably connected to the fixed housing and located at the opening of the sliding channel. The rotating cam is provided with a recess that matches the boss. The recess matches the boss to rotate and position the rotating cam.
[0009] An elastic element is installed within the sliding channel and elastically supports the sliding cam so that the sliding cam tends to move toward the opening of the sliding channel.
[0010] In some embodiments, the fixed housing is configured as a square structure, the sliding channel is a square channel, and the outer contour of the sliding cam is adapted to the square channel.
[0011] In some embodiments, the arm pivot further includes a connecting shaft, one end of which extends into the sliding channel and is connected to the fixed housing, and the other end of which extends out from the opening of the sliding channel. The sliding cam is provided with a through hole, through which the connecting shaft passes. The rotating cam is provided with a rotating hole, through which the connecting shaft passes so that the rotating cam is rotatably connected to the connecting shaft.
[0012] In some embodiments, a rib is provided at the end of the connecting shaft away from the sliding channel, and the end of the rib facing the rotating cam abuts against the rotating cam.
[0013] In some embodiments, the rotating cam is provided with a receiving hole communicating with the rotating hole, and the protruding rib is located in the receiving hole.
[0014] In some embodiments, the fixed housing has a through hole at one end facing away from the opening, the connecting shaft has one end located in the sliding channel passing through the through hole, and the connecting shaft has one end facing away from the rotating cam detachably connected to the fixed housing.
[0015] In some embodiments, an annular recess is provided on the outer periphery of one end of the connecting shaft extending out of the through hole, and the arm shaft further includes a retaining ring, which is engaged with the annular recess.
[0016] In some embodiments, the fixed housing has two positioning ribs at one end of the through hole, the two positioning ribs are located on both sides of the through hole, and the outer peripheral wall of the retaining ring is in clearance fit with the two positioning ribs.
[0017] In some embodiments, the sliding cam has two protrusions arranged symmetrically, and the rotating cam has two recesses that are adapted to the corresponding protrusions so that the rotating cam can be positioned every 90° of rotation.
[0018] This utility model also provides a drone, which includes a machine body, multiple fixed arms, multiple rotating arms, and multiple arm pivots as described above. The number of fixed arms and rotating arms is the same. Each fixed arm is rotatably connected to the machine body so that each fixed arm can rotate and fold around the plane on which the machine body is placed. The fixed housing of each arm pivot is fixedly connected to the corresponding fixed arm. The rotating cam of each arm pivot is fixedly connected to the rotating arm. The rotating arm can rotate relative to the fixed arm under the rotational connection between the rotating cam and the fixed housing.
[0019] The beneficial effects of this utility model's technical solution are as follows:
[0020] The arm pivot of this invention features a sliding cam on a fixed housing connected to a fixed arm, and a recess on a rotating cam connected to a rotating arm that matches the protrusion of the sliding cam. Through the elastic engagement of the protrusion and the recess, the rotating cam can be positioned at a specific angle, such as rotating the rotating arm 180° relative to the fixed arm. This ensures that the motor propeller at the end of the rotating arm is positioned below the fuselage after folding, thus preventing interference between the motor propeller and the adjacent arm after folding. Furthermore, the automatic reset feature of the elastic element ensures a smooth folding and unlocking process without manual intervention. After folding and storing, the rotating arm is tightly positioned on the side of the fuselage, minimizing the overall size and making it easy for users to carry. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the structure of the arm shaft in an embodiment of the present invention;
[0022] Figure 2 This is an exploded view of the structure of the arm shaft according to an embodiment of the present invention;
[0023] Figure 3 This is a cross-sectional view of the arm shaft in an embodiment of the present invention;
[0024] Figure 4 for Figure 1 A schematic diagram of the structure of the rotating cam.
[0025] Explanation of icon numbers:
[0026] 100. Fixed housing; 110. Sliding channel; 120. Through hole; 130. Positioning rib; 200. Sliding cam; 210. Boss; 220. Through hole; 300. Rotating cam; 310. Recess; 320. Rotating hole; 330. Receiving hole; 400. Elastic element; 500. Connecting shaft; 510. Raised rib; 520. Annular recess; 600. Snap ring. Detailed Implementation
[0027] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model. In addition, the descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.
[0028] To address the technical deficiencies in related technologies, this utility model provides a machine arm pivot. Please refer to [link / reference needed]. Figures 1 to 3 The arm pivot includes: a fixed housing 100, a sliding cam 200, a rotating cam 300, and an elastic element 400. The fixed housing 100 is connected to the fixed arm and has a sliding channel 110 with one end open. The fixed housing 100 can be in the shape of a circular strip, a square strip, or other strip shapes, which are not limited here.
[0029] Furthermore, the sliding cam 200 is slidably installed in the sliding channel 110, and a boss 210 is provided at the end of the sliding cam 200 facing the opening of the sliding channel 110; the rotating cam 300 is connected to the rotating arm, and the rotating cam 300 is rotatably connected to the fixed housing 100 and located at the opening of the sliding channel 110. The rotating cam 300 is provided with a recess 310 that matches the boss 210. The recess 310 matches the boss 210 to rotate and position the rotating cam 300. In this way, through the elastic meshing design of the boss 210 and the recess 310, the rotating cam 300 can be rotated and positioned at a specific angle, for example, rotating the rotating arm 180° relative to the fixed arm. Furthermore, to ensure stable and reliable engagement between the boss 210 and the recess 310, the arm shaft is also equipped with an elastic element 400. This elastic element 400 is installed within the sliding channel 110 and provides elastic support to the sliding cam 200, causing the sliding cam 200 to tend to move towards the opening of the sliding channel 110. Specifically, one end of the elastic element 400 abuts against the bottom of the sliding channel 110, and the other end abuts against the sliding boss 210. This allows the recess 310 and the boss 210 to misalign during rotation of the rotating cam 300, compressing the elastic element 400 and storing energy. As the rotating cam 300 continues to rotate, the recess 310 engages with the boss 210, and the elastic element 400 releases its elasticity, positioning the rotating cam 300 and the sliding cam 200 relative to each other, thereby fixing the rotating arm and the fixed arm relatively.
[0030] It should be noted that the elastic element 400 can be a spring, a spring block, a spring sheet, or other mechanical components with elastic deformation capabilities. The specific structure of the elastic element 400 is not limited here.
[0031] Through the above technical solution, the arm pivot of this utility model is provided with a sliding cam 200 on the fixed housing 100 connected to the fixed arm, and a recess 310 adapted to the boss 210 of the sliding cam 200 is provided on the rotating cam 300 connected to the rotating arm. Through the elastic meshing design of the boss 210 and the recess 310, the rotating cam 300 can be rotated and positioned at a specific angle, such as rotating the rotating arm 180° relative to the fixed arm. This ensures that the motor propeller at the end of the rotating arm is in a clearance position under the body after the arm is folded, thereby avoiding interference between the motor propeller and the adjacent arm after the rotating arm is folded. Furthermore, the automatic reset feature of the elastic element 400 makes the entire operation process smooth without manual unlocking and rotation folding. After the rotating arm is folded and stored, it is tightly located on the side of the body, minimizing the overall size and making it convenient for users to carry.
[0032] To ensure a stable and reliable connection between the fixed housing 100 and the fixed arm, in this embodiment, the fixed housing 100 is designed with a square structure. When the fixed housing 100 is fixed to the fixed arm, the torque generated during arm rotation is offset by the square shape of the outer contour of the housing, preventing the fixed housing 100 from rotating and thus avoiding rotation along with the arm. Similarly, the sliding channel 110 is a square channel, and the outer contour of the sliding cam 200 matches the square channel. This matching of the square channel and the contour of the sliding cam 200 effectively restricts the circumferential rotation of the sliding cam 200, ensuring that the boss 210 is always aligned with the direction of the rotating cam 300, preventing positioning failure due to rotational misalignment, and enhancing structural reliability.
[0033] In some embodiments, the arm pivot further includes a connecting shaft 500. One end of the connecting shaft 500 extends into the sliding channel 110 and is connected to the fixed housing 100. The other end of the connecting shaft 500 extends out from the opening of the sliding channel 110. The sliding cam 200 is provided with a through hole 220, through which the connecting shaft 500 passes. The rotating cam 300 is provided with a rotating hole 320, through which the connecting shaft 500 passes, allowing the rotating cam 300 to be rotatably connected to the connecting shaft 500. The connecting shaft 500 passes through the fixed housing 100, the sliding cam 200, and the rotating cam 300 to form a core support shaft, ensuring the free rotation of the rotating cam 300 while integrating the various components into a compact unit. The through hole 220 design allows the sliding cam 200 to slide along the shaft, simplifying the assembly process and improving structural stability.
[0034] In addition, a rib 510 is provided at the end of the connecting shaft 500 away from the sliding channel 110, and the end of the rib 510 facing the rotating cam 300 abuts against the rotating cam 300. With this configuration, the rib 510 provides axial restraint to the rotating cam 300, preventing it from dislodging from the connecting shaft 500, while also reducing axial movement during rotation, lowering the risk of wear, and extending the service life of the shaft.
[0035] In addition, the rotating cam 300 is provided with a receiving hole 330 that communicates with the rotating hole 320, and the protruding rib 510 is located in the receiving hole 330. The receiving hole 330 provides space for the protruding rib 510 to be embedded, avoiding the protruding rib 510 from being exposed and increasing the structural thickness, and further compressing the overall size of the rotating shaft.
[0036] In some embodiments, the fixed housing 100 has a through hole 120 at one end facing away from the opening, and the connecting shaft 500 is located within the sliding channel 110 at one end, passing through the through hole 120. The end of the connecting shaft 500 facing away from the rotating cam 300 is detachably connected to the fixed housing 100. The detachable connection design enables modular assembly of the connecting shaft 500 and the fixed housing 100, facilitating subsequent disassembly, maintenance, or component replacement.
[0037] It should be noted that there are multiple ways to detachably connect the connecting shaft 500 and the fixed housing 100. For example, the end of the connecting shaft 500 is provided with a threaded hole, and a screw is used to connect to the threaded hole. The screw head is larger than the through hole 120. In this way, the connecting shaft 500 can be fixed to the fixed housing 100, and it is also convenient to disassemble.
[0038] For example, in this embodiment, an annular recess 520 is provided on the outer periphery of the end of the connecting shaft 500 that extends out of the through hole 120, and the arm shaft also includes a retaining ring 600, which is snapped into the annular recess 520. The snapping method between the retaining ring 600 and the annular recess 520 does not require thread locking, resulting in high assembly efficiency and a firm connection; the annular groove structure of the annular recess 520 evenly distributes the force, preventing shaft deformation caused by local stress concentration.
[0039] In addition, the fixed housing 100 has two positioning ribs 130 at one end of the through hole 120. The two positioning ribs 130 are located on both sides of the through hole 120, and the outer peripheral wall of the retaining ring 600 is clearance-fitted with the two positioning ribs 130. In this configuration, the positioning ribs 130 provide circumferential restraint to the retaining ring 600, preventing the retaining ring 600 from accidentally rotating and falling off due to vibration. The clearance fit design also takes into account assembly tolerance, reduces the precision requirements of part machining, and improves production yield.
[0040] In some embodiments, the sliding cam 200 has two protrusions 210 arranged symmetrically, and the rotating cam 300 has two recesses 310, which are adapted to the corresponding protrusions 210 so that the rotating cam 300 can be positioned every 90° of rotation. Through the symmetrical meshing arrangement of the two protrusions 210 and the two recesses 310, the rotating cam 300 can be locked at both the 0° and 180° key positions, satisfying the positioning requirements in the deployed flight state and ensuring that the arm maintains a stable avoidance posture after folding and storage, thus improving operational certainty.
[0041] This utility model also provides a drone, which includes a machine body, multiple fixed arms, multiple rotating arms, and multiple arm pivots. The number of fixed arms and rotating arms is the same. Each fixed arm is rotatably connected to the machine body so that each fixed arm can rotate and fold around the plane on which the machine body is placed. The fixed housing 100 of each arm pivot is fixedly connected to the corresponding fixed arm. The rotating cam 300 of each arm pivot is fixedly connected to the rotating arm. The rotating arm can rotate relative to the fixed arm under the rotational connection between the rotating cam 300 and the fixed housing 100.
[0042] With this configuration, the 180° rotation function of the arm pivot allows the propellers at the ends of each rotating arm to avoid downward movement. Combined with the horizontal folding of the fixed arm, this achieves compact stacking and storage of the arms, completely solving the problem of interference between the motor propeller and adjacent arms, minimizing the overall size of the machine, and significantly improving portability.
[0043] It should be noted that the specific structure of the arm pivot is as described in the above embodiments. Since the UAV adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.
[0044] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.
Claims
1. A machine arm pivot, comprising: The arm pivot includes: A fixed housing (100) is connected to a fixed arm, the fixed housing (100) having a sliding channel (110) with one end open; A sliding cam (200) is slidably installed in the sliding channel (110), and a boss (210) is provided at the end of the sliding cam (200) facing the opening of the sliding channel (110); A rotating cam (300) is connected to a rotating arm. The rotating cam (300) is rotatably connected to the fixed housing (100) and located at the opening of the sliding channel (110). The rotating cam (300) is provided with a recess (310) that matches the boss (210). The recess (310) matches the boss (210) to rotate and position the rotating cam (300). An elastic element (400) is installed in the sliding channel (110) and elastically supports the sliding cam (200) so that the sliding cam (200) tends to move toward the opening of the sliding channel (110).
2. The machine arm pivot of claim 1, wherein, The fixed housing (100) is arranged in a square structure, the sliding channel (110) is a square channel, and the outer contour of the sliding cam (200) is adapted to the square channel.
3. The machine arm pivot of claim 1, wherein, The arm pivot also includes a connecting shaft (500), one end of which extends into the sliding channel (110) and is connected to the fixed housing (100), and the other end of which extends out from the opening of the sliding channel (110). The sliding cam (200) is provided with a through hole (220), and the connecting shaft (500) passes through the through hole (220). The rotating cam (300) is provided with a rotating hole (320), and the connecting shaft (500) passes through the rotating hole (320) so that the rotating cam (300) is rotatably connected to the connecting shaft (500).
4. The machine arm pivot of claim 3, wherein, The connecting shaft (500) has a rib (510) at one end away from the sliding channel (110), and the end of the rib (510) facing the rotating cam (300) abuts against the rotating cam (300).
5. The machine arm pivot of claim 4, wherein, The rotating cam (300) is provided with a receiving hole (330) that communicates with the rotating hole (320), and the protruding rib (510) is located in the receiving hole (330).
6. The machine arm pivot of claim 3, wherein, The fixed housing (100) has a through hole (120) at one end facing away from the opening. The connecting shaft (500) is located in the sliding channel (110) and passes through the through hole (120). The connecting shaft (500) is detachably connected to the fixed housing (100) at one end facing away from the rotating cam (300).
7. The arm pivot according to claim 6, characterized in that, The outer periphery of the end of the connecting shaft (500) that extends out of the through hole (120) is provided with an annular recess (520), and the arm rotating shaft also includes a retaining ring (600), which is engaged with the annular recess (520).
8. The arm pivot according to claim 7, characterized in that, The fixed housing (100) has two positioning ribs (130) at one end of the through hole (120). The two positioning ribs (130) are located on both sides of the through hole (120), and the outer peripheral wall of the retaining ring (600) is in clearance fit with the two positioning ribs (130).
9. The arm pivot according to claim 1, characterized in that, The sliding cam (200) has two bosses (210) arranged symmetrically. The rotating cam (300) has two recesses (310) that are adapted to the corresponding bosses (210) so that the rotating cam (300) can be positioned every 90° rotation.
10. A drone, characterized in that, The drone includes a main body, multiple fixed arms, multiple rotating arms, and multiple arm pivots according to any one of claims 1 to 9. The number of fixed arms and rotating arms is the same. Each fixed arm is rotatably connected to the main body so that each fixed arm can rotate and fold around the plane on which the main body is placed. The fixed housing (100) of each arm pivot is fixedly connected to the corresponding fixed arm. The rotating cam (300) of each arm pivot is fixedly connected to the rotating arm. The rotating arm can rotate relative to the fixed arms under the rotational connection between the rotating cam (300) and the fixed housing (100).