Speed-controllable maintenance-free wing unfolding mechanism

Abstract

The invention discloses a speed-controllable maintenance-free wing unfolding mechanism, which belongs to the field of unmanned aerial vehicles, and comprises a mounting unit, a wing unfolding unit, a wing unfolding unit and a wing unfolding unit, the driving unit is fixedly mounted on the mounting unit; the first rotating shaft assembly is provided with a first center shaft, the direction where the first center shaft is located is set to be the first direction, the first rotating shaft assembly can be driven by the driving unit to rotate around the first center shaft, the rotating direction is the first rotating direction, and a cavity is formed in the first rotating shaft assembly; the second rotating shaft assembly is installed in the cavity of the first rotating shaft assembly, and the first rotating shaft assembly limits the second rotating shaft assembly; and the third rotating shaft assembly is fixedly provided with a second rotor wing and can be driven by the driving unit to rotate around the first center shaft.

Description

Technical Field

[0001] The invention relates to the field of unmanned aerial vehicle rotors. Background Art

[0002] In the design process of drones, the main rotor is usually a very important part, which provides a large lift for the drone to ensure that the drone does not fall. However, the greater the lift, the larger the area of ​​the rotor is usually. When a small drone is mounted on a large carrier aircraft, the rotor is too large and too long, which will make it impossible to place multiple small drones side by side. Therefore, the rotor needs to be folded to reduce the width of the entire aircraft to ensure that multiple drones can be mounted.

[0003] The usual rotor folding and unfolding mechanism uses a spring as the power source. When the rotor is stowed, the spring is in a stretched state and the rotor is locked by a locking pin. When the rotor is unfolded, the locking pin is disengaged and the spring tension force pulls the rotor to the wing-spreading state. With this mechanism, when the small drone is placed in the packaging box, the spring needs to be stretched all the time. Long-term stretching may cause the spring force to change or even fail. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art and disclose a speed-controllable maintenance-free wing span mechanism, comprising: A mounting unit, which is mounted on the drone body; A driving unit, which is fixedly mounted on the mounting unit; A first rotating shaft assembly, which has a first central axis, the direction of the first central axis is set as a first direction, the first rotating shaft assembly can be driven by a driving unit to rotate around the first central axis, and the rotation direction is a first rotation direction, and a cavity is provided inside the first rotating shaft assembly; A second rotating shaft assembly is installed in the cavity of the first rotating shaft assembly, the first rotating shaft assembly limits the second rotating shaft assembly so that the second rotating shaft assembly has only a sliding freedom in a first direction relative to the first rotating shaft assembly, a bevel groove is provided on the surface of the second rotating shaft assembly, and the second rotating shaft is fixedly mounted with a first rotor; The third rotating shaft assembly is fixedly mounted with the second rotor, which can be driven by the driving unit to rotate around the first central axis, and its rotation direction is the second rotation direction, and the first rotation direction is opposite to the second rotation direction. The third rotating shaft assembly includes at least one protrusion, which is accommodated in the inclined groove body of the second rotating shaft assembly, so that when the third rotating shaft assembly and the second rotating shaft assembly rotate relative to each other about the first central axis, the second rotating shaft assembly can move in the first direction relative to the third rotating shaft assembly, driving the first rotor and the second rotor to move away from each other in the first direction.

[0005] In a preferred embodiment, the first rotating shaft assembly includes a first gear, the third rotating shaft assembly includes a second gear, and the driving unit includes a driving gear, and the driving gear is respectively engaged with the first gear and the second gear, so that when the driving gear is driven to rotate, the first gear and the second gear rotate in opposite directions, and the second rotating shaft assembly and the third rotating shaft assembly rotate in opposite directions.

[0006] In a preferred embodiment, the second rotating shaft assembly is provided with a slot extending along the first direction, and the first rotating shaft assembly is provided with a clamping column, which is accommodated in the slot and can move in the slot along the first direction to limit the relative rotation of the first rotating shaft assembly and the second rotating shaft assembly, and allow the first rotating shaft assembly and the second rotating shaft assembly to slide relative to each other in the first direction.

[0007] In a preferred embodiment, the driving unit further includes a connecting shaft connected to the driving gear and a motor connected to the connecting shaft. The motor is mounted on the mounting unit, and the motor drives the driving gear to rotate via the connecting shaft.

[0008] In a preferred embodiment, the first rotating shaft assembly further includes a first shaft portion, and the first shaft portion passes through the first gear so that when the first gear is driven to rotate, the first shaft portion can be driven to rotate.

[0009] In a preferred solution, two inclined grooves are provided on the surface of the second rotating shaft assembly, and the first rotor can be installed at the end of the second rotating shaft assembly.

[0010] In a preferred embodiment, the third rotating shaft assembly also includes a second shaft member and a connecting portion; the second shaft member is a hollow ring, the connecting portion is connected to the second shaft member, the connecting portion is fixedly connected to the protrusion, and the connecting portion can be used to install the second rotor.

[0011] In a preferred embodiment, a channel is provided inside the connecting portion, the end of the protrusion is accommodated in the channel and can move in the channel, two spring cavities connected to the channel are provided at both ends of the channel, rods are connected to both sides of the protrusion, the rods are inserted into the spring cavities, a spring is accommodated between the end of the rod and the end of the spring cavity, and the spring is preloaded and compressed.

[0012] In a preferred solution, the two ends of the spring are connected by a drawstring so that the spring is preloaded and compressed.

[0013] In a preferred solution, the second rotor is provided with a receiving cavity, the connecting portion of the third rotating shaft assembly is received in the receiving cavity, and the connecting portion is fixedly connected to the side wall of the receiving cavity.

[0014] The mechanism tooling of the present invention is used when the wing width is close to the fuselage, and the left and right wings cannot be completely placed under the wings. At this time, one wing needs to move up and down to avoid the other wing when folded. Therefore, the present application uses a single power source to complete the two movements of the wing's rise and rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the entire application; Figure 2 is a schematic diagram of the installation unit; Figure 3 is a schematic diagram of a first rotating shaft assembly; Figure 4 is a schematic diagram of the second rotor; Figure 5 is a schematic diagram of a third rotating shaft assembly; Figure 6 is a schematic diagram of a second rotating shaft assembly; Figure 7 is an assembly diagram of the third rotating shaft assembly, the first rotating shaft assembly and the second rotating shaft assembly; Figure 8 is a schematic diagram of the connection between the connecting portion and the protrusion; Fig. 9 is a schematic diagram of the installation unit; Fig.10 is a schematic diagram of the connection between the second rotating shaft assembly and the first rotating shaft assembly; Markings in the figure: 100-installation unit, 200-driving unit, 210-driving gear, 220-connecting shaft, 230-motor, 300-first rotating shaft assembly, 310-first gear, 320-first shaft portion, 400-second rotating shaft assembly, 410-inclined groove body, 420-slot, 500-third rotating shaft assembly, 510-second gear, 520-second shaft member, 530-connecting portion, 531-channel, 532-spring chamber, 533-spring, 534-pull rope, 540-protrusion, 550-rotating member, 600-first rotor, 700-second rotor, 710-accommodating chamber, 800-lock pin. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] like Figure 1 and Figure 2As shown, this embodiment discloses a controllable speed maintenance-free wing span mechanism, including an installation unit 100, a drive unit 200, a first rotating shaft assembly 300, a second rotating shaft assembly 400, and a third rotating shaft assembly 500; the drive unit 200, the first rotating shaft assembly 300, the second rotating shaft assembly 400, and the third rotating shaft assembly 500 are all installed on the installation unit 100.

[0018] like Figure 1 As shown, the installation unit 100 is installed on the drone body. Fig. 9 FIG. 1 is a schematic diagram of the frame structure of the installation unit 100, in the middle of which the first rotating shaft assembly 300, the second rotating shaft assembly 400 and the third rotating shaft assembly 500 are fixedly installed. Fig. 9 As shown, the first rotating shaft assembly 300 is installed in the circular ring above the mounting unit 100. There is a cavity inside the first rotating shaft assembly 300. The second rotating shaft assembly 400 is located in the cavity inside the first rotating shaft assembly 300. The third rotating shaft assembly 500 is installed in the circular ring below the mounting unit 100.

[0019] like Figure 3 The first rotating shaft assembly 300 is shown as a schematic diagram. The first rotating shaft assembly 300 has a first central axis. The direction of the first central axis is set as a first direction. Figure 3 The first rotating shaft assembly 300 can be driven by the driving unit 200 to rotate around the first central axis, and its rotation direction is the first rotation direction. The first rotating shaft assembly 300 includes a first gear 310 and a first shaft portion 320, and the first shaft portion 320 passes through the first gear 310 and is fixedly connected to the first gear 310, so that when the first gear 310 is driven to rotate by the driving unit 200, the first shaft portion 320 can be driven to rotate. The first shaft portion 320 is installed on the mounting unit 100 through bearings and other components, so that when the mounting unit 100 is stationary, the first shaft portion 320 can rotate in the first direction.

[0020] Continue as Figure 3As shown, the second rotating shaft assembly 400 is installed in the cavity of the first rotating shaft assembly 300. The interior of the second rotating shaft assembly 400 is a through channel structure. Specifically, a cylindrical channel is provided inside the first rotating shaft, and the second rotating shaft assembly 400 is located in the cylindrical channel. The first rotating shaft assembly 300 limits the second rotating shaft assembly 400 so that the second rotating shaft assembly 400 only has a first direction of sliding freedom relative to the first rotating shaft assembly 300. That is, the second rotating shaft assembly 400 can only slide in the first direction relative to the first rotating shaft assembly 300. When the first rotating shaft assembly 300 rotates around the first center axis, the second rotating shaft assembly 400 also rotates with the first rotating shaft assembly 300.

[0021] In order to limit the first rotating shaft assembly 300 and the second rotating shaft assembly 400, as shown in FIG. Fig.10 As shown, the second rotating shaft assembly 400 is provided with a slot 420, which extends along the first direction, and the first rotating shaft assembly 300 is provided with a clamping column, which is accommodated in the slot 420 and can move in the slot 420 along the first direction to limit the relative rotation of the first rotating shaft assembly 300 and the second rotating shaft assembly 400, and allow the first rotating shaft assembly 300 and the second rotating shaft assembly 400 to slide relative to each other in the first direction, so that when the second rotating shaft assembly 400 is subjected to a first force along the first direction, the second rotating shaft assembly 400 can move relative to the first rotating shaft assembly 300, and since the first rotor 600 is fixedly installed at the end of the second rotating shaft assembly 400, the first rotor can move relative to the first rotating shaft assembly 300 in the first direction. The first rotating shaft assembly 300 is fixed relative to the mounting unit 100 in the first direction, so the first rotor 600 can move relative to the first rotating shaft assembly 300 in the first direction.

[0022] like Figure 3 As shown, the surface of the second rotating shaft assembly 400 is provided with an inclined surface groove body 410. In a preferred embodiment, the surface of the second rotating shaft assembly 400 is provided with two inclined surface groove bodies 410. The function of the inclined surface groove bodies 410 is further described below.

[0023] In order to make the second rotating shaft assembly 400 have a force along the first direction, as Figure 7 and Figure 5 ( Figure 5, which is a structural schematic diagram of the third rotating shaft assembly 500, the third rotating shaft assembly 500 is mounted on the mounting unit 100. Specifically, the third rotating shaft assembly 500 is mounted on the mounting unit 100 through bearings and the like. The third rotating shaft assembly 500 can be mounted with the second rotor 700. The third rotating shaft assembly 500 can be driven by the driving unit 200 to rotate around the first central axis, and its rotation direction is the second rotation direction. The first rotation direction and the second rotation direction are opposite. Figure 7 As shown, the third rotating shaft assembly 500 includes at least one protrusion 540, and the protrusion 540 is accommodated in the inclined groove body 410 of the second rotating shaft assembly 400, so that when the third rotating shaft assembly 500 and the second rotating shaft assembly 400 rotate relative to each other about the first center axis, the second rotating shaft assembly 400 can move in the first direction relative to the third rotating shaft assembly 500, driving the first rotor 600 and the second rotor 700 to move away from each other in the first direction, thereby allowing the two rotors to have a certain gap in the first direction to achieve folding of the rotors. Specifically, when the first rotating shaft assembly 300 is driven by the driving unit 200 to rotate in one direction, the second rotating shaft assembly 400 will also rotate with the first rotating shaft assembly 300. At this time, the third rotating shaft assembly 500 rotates in the opposite direction. The protrusion 540 of the third rotating shaft assembly 500 is inserted into the inclined groove body 410, and its protrusion 540 will move along the inclined groove body 410, thereby applying a component force to the third rotating shaft assembly 500, so that the second rotating shaft assembly 400 slides in the first direction relative to the first rotating shaft assembly 300. Further, the second rotating shaft assembly 400 moves in the first direction relative to the third rotating shaft assembly 500, so that the two rotors have sufficient clearance.

[0024] In order to make the first rotating shaft assembly 300 and the third rotating shaft assembly 500 rotate in opposite directions, in an improved solution, as shown in FIG. Figure 2 As shown, the first rotating shaft assembly 300 includes a first gear 310, the third rotating shaft assembly 500 includes a second gear 510, and the driving unit 200 includes a driving gear 210, and the driving gear 210 is respectively engaged with the first gear 310 and the second gear 510, so that when the driving gear 210 is driven to rotate, the first gear 310 and the second gear 510 rotate in opposite directions, and the second rotating shaft assembly 400 and the third rotating shaft assembly 500 rotate in opposite directions.

[0025] In more specific solutions, such as Figure 2 As shown, the driving unit 200 also includes a connecting shaft 220 connected to the driving gear 210 and a motor 230 connected to the connecting shaft 220. The motor 230 is installed on the mounting unit 100, and the motor 230 drives the driving gear 210 to rotate through the connecting shaft 220.

[0026] Among the more preferred solutions, Figure 7 As shown, the third rotating shaft assembly 500 further includes a second shaft member 520 and a connecting portion 530; the second shaft member 520 is a hollow ring, which is mounted on the mounting unit 100 through a bearing or the like, and the second shaft member 520 can rotate relative to the mounting unit 100. The connecting portion 530 is connected to the second shaft member 520, and the connecting portion 530 is fixedly connected to the protrusion 540, and the connecting portion 530 can be installed with the second rotor 700. In a more specific solution, the second rotor 700 is provided with a receiving cavity 710, and the connecting portion 530 of the third rotating shaft assembly 500 is received in the receiving cavity 710, and the connecting portion 530 is fixedly connected to the side wall of the receiving cavity through a screw or the like.

[0027] When the rotor needs to be retracted, the drive unit 200 creates a gap between the two rotors so that they can be retracted; when the rotor needs to be opened, the drive unit 200 makes the opposite movement, and the protrusion 540 slides to the edge of the inclined groove 410 (such as Figure 6 ), as shown Figure 4 As shown, the end of the second rotating shaft assembly 400 is just kept level with the end of the second rotor 700. At this time, the first rotor 600 can be directly installed on the end of the second rotating shaft assembly 400, and can be installed by a fixed connection method such as a screw. At this time, the two rotors are in an open state, and the mounting unit 100 and the first shaft portion 320 are fixed by a locking pin 800, so that they can fly normally. When in use, the progress of the driving unit 200 is adjusted or a sensor is provided on the inclined groove body 410 to detect whether the rotor is opened or retracted to a fixed position.

[0028] When the protrusion 540 is accommodated in the inclined groove 410 and slides along the inclined groove 410, it will cause the third rotating shaft assembly 500 to slide relatively to the second rotating shaft assembly 400. Therefore, in the preferred solution, Figure 5 As shown, a rotating member 550 is installed at the end of the protrusion 540, and the rotating member 550 rotates relative to the protrusion 540 in the axial direction of the protrusion 540. The rotating member 550 can be a bearing, whose inner ring is fixed on the protrusion 540, and the outer ring is in contact with the bevel groove body 410 and can roll in the bevel groove body 410, thereby reducing the rotational load of the third rotating shaft assembly 500.

[0029] It was also found during use that when the driving unit 200 is started, when the driving gear 210 drives the third rotating shaft assembly 500 to rotate in the second rotation direction, and the driving gear 210 drives the second rotating shaft assembly 400 to rotate in the first rotation direction by driving the first rotating shaft assembly 300, since the second rotating shaft assembly 400 was previously stationary relative to the first rotating shaft assembly 300, the second rotating shaft assembly 400 cannot move at a sufficient speed relative to the first rotating shaft assembly 300, and the second rotating shaft assembly 400 and the third rotating shaft assembly 500 cannot rotate relative to each other at a matching speed (relative to the rotation speed of the driving gear 210). As a result, the extrusion force of the protrusion 540 on the second rotating shaft assembly 400 is too large, and the load on the driving gear 210 is too large, which may damage the motor 230, and increase the wear between the driving gear 210 and the first gear 310 and the second gear 510, and in severe cases, the gears may be damaged.

[0030] Therefore, in order to solve the above problem, in the improved solution, the connection part 530 is provided with a channel 531 inside, the end of the protrusion is accommodated in the channel 531 and can move in the channel, two spring chambers 532 connected to the channel are provided at both ends of the channel 531, rods are connected to the two sides of the protrusion 540, the rods are inserted into the spring chambers 532, and a spring 533 is accommodated between the end of the rod and the end of the spring chamber 532, and the spring 533 is preloaded and compressed; the two ends of the spring 533 are connected by a pull rope 534, so that the spring 533 is preloaded and compressed; assuming that the force preloaded by the pull rope 534 on the spring 533 is N, at this time, if the end of the protrusion presses against the spring 5 When the extrusion pressure of 33 (which is the same as the extrusion pressure of the protrusion on the inclined groove) is less than N, at this time, the protrusion 540 will not move relative to the connecting part 530, maintaining the relative rigidity of the two and providing stable operation. When the driving gear 210 is driven instantaneously, the extrusion pressure of the protrusion 540 on the inclined groove increases instantaneously. At this time, the extrusion pressure of the end of the protrusion on the spring 533 exceeds N. At this time, the spring 533 is squeezed, and the protrusion 540 moves relative to the connecting part 530, thereby making the third rotating shaft assembly 500 and the second rotating shaft assembly 400 have sufficient rotation accommodation space, reducing the load received by the driving gear 210 and protecting each gear and the motor.

[0031] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A speed-controllable maintenance-free wing span mechanism, characterized in that: Included are: A mounting unit (100) mounted on a drone body; A driving unit (200) fixedly mounted on the mounting unit (100); A first rotating shaft assembly (300), which has a first central axis, the direction of the first central axis is set as a first direction, the first rotating shaft assembly (300) can be driven by the driving unit (200) to rotate around the first central axis, the rotation direction is a first rotation direction, and a cavity is provided inside the first rotating shaft assembly (300); A second rotating shaft assembly (400) is installed in the cavity of the first rotating shaft assembly (300); the first rotating shaft assembly (300) limits the second rotating shaft assembly (400) so that the second rotating shaft assembly (400) has only a sliding freedom in a first direction relative to the first rotating shaft assembly (300); a sloped groove (410) is provided on the surface of the second rotating shaft assembly (400); and a first rotor (600) is fixedly mounted on the second rotating shaft; The third rotating shaft assembly (500) is fixedly mounted with a second rotor (700), and can be driven by a driving unit (200) to rotate around a first central axis, wherein the rotation direction is a second rotation direction, and the first rotation direction is opposite to the second rotation direction. The third rotating shaft assembly (500) includes at least one protrusion (540), wherein the protrusion (540) is accommodated in an inclined groove (410) of the second rotating shaft assembly (400), so that when the third rotating shaft assembly (500) and the second rotating shaft assembly (400) rotate relative to each other about the first central axis, the second rotating shaft assembly (400) can move in a first direction relative to the third rotating shaft assembly (500), thereby driving the first rotor (600) and the second rotor (700) to move away from each other in the first direction.

2. The speed-controllable maintenance-free wing span mechanism according to claim 1, characterized in that: The first rotating shaft assembly (300) includes a first gear (310), the third rotating shaft assembly (500) includes a second gear (510), and the driving unit (200) includes a driving gear (210), wherein the driving gear (210) is meshed with the first gear (310) and the second gear (510), respectively, so that when the driving gear (210) is driven to rotate, the first gear (310) and the second gear (510) rotate in opposite directions, and the second rotating shaft assembly (400) and the third rotating shaft assembly (500) rotate in opposite directions.

3. The speed-controllable maintenance-free wing span mechanism according to claim 2, characterized in that: The second rotating shaft assembly (400) is provided with a slot (420) extending along a first direction, and the first rotating shaft assembly (300) is provided with a clamping column, the clamping column is accommodated in the slot (420) and can move in the slot (420) along the first direction to limit the relative rotation of the first rotating shaft assembly (300) and the second rotating shaft assembly (400) and allow the first rotating shaft assembly (300) and the second rotating shaft assembly (400) to slide relative to each other in the first direction.

4. The speed-controllable maintenance-free wing span mechanism according to claim 3, characterized in that: The driving unit (200) further comprises a connecting shaft (220) connected to the driving gear (210), and a motor (230) connected to the connecting shaft (220); the motor (230) is mounted on the mounting unit (100); and the motor (230) drives the driving gear (210) to rotate via the connecting shaft (220).

5. The speed-controllable maintenance-free wing span mechanism according to claim 3, characterized in that: The first rotating shaft assembly (300) further comprises a first shaft portion (320), wherein the first shaft portion (320) passes through the first gear (310) so that when the first gear (310) is driven to rotate, the first shaft portion (320) can be driven to rotate.

6. The speed-controllable maintenance-free wing span mechanism according to claim 3, characterized in that: The surface of the second rotating shaft assembly (400) is provided with two inclined grooves (410), and the end of the second rotating shaft assembly (400) can be mounted with the first rotor (600).

7. The speed-controllable maintenance-free wing span mechanism according to claim 3, characterized in that: The third rotating shaft assembly (500) further comprises a second shaft member (520) and a connecting portion (530); the second shaft member (520) is in the shape of a hollow ring, the connecting portion (530) is connected to the second shaft member (520), the connecting portion (530) is fixedly connected to the protrusion (540), and the connecting portion (530) is capable of mounting the second rotor (700).

8. The speed-controllable maintenance-free wing span mechanism according to claim 7, characterized in that: The connecting portion (530) is provided with a channel (531) inside, the end of the protrusion (540) is accommodated in the channel (531) and can move in the channel (531), two spring cavities (532) connected to the channel (531) are provided at both ends of the channel (531), the two sides of the protrusion (540) are connected with rods, the rods are inserted into the spring cavities (532), a spring (533) is accommodated between the end of the rod and the end of the spring cavity (532), and the spring (533) is preloaded and compressed.

9. The speed-controllable maintenance-free wing span mechanism according to claim 8, characterized in that: The two ends of the spring (533) are connected by a pull rope (534), so that the spring (533) is preloaded and compressed.

10. The speed-controllable maintenance-free wing span mechanism according to claim 9, characterized in that: The second rotor (700) is provided with a receiving chamber (710), and the connecting portion (530) of the third rotating shaft assembly (500) is received in the receiving chamber (710).

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