A coaxial folding mechanism for a drone wing

Abstract

This invention relates to a coaxial folding mechanism for a drone wing, belonging to the field of drone aircraft technology. It includes: a main shaft assembly (1), a right rear wing connecting assembly (2), a left rear wing connecting assembly (3), a thrust bearing (6), and a tension spring (7). The mechanism ensures that the rear wing can be fixed within a limited space after folding, the width of the folded rear wing does not exceed the width of the fuselage, and the height of the folded wing is sufficient to fit inside the payload bay without interfering with it. During drone flight, to ensure the rear wing can smoothly unfold and securely lock in place despite its own weight and air resistance, torsion springs are provided in the left and right rear wing connecting assemblies, and a tension spring connects the two assemblies, increasing the tension drive and ensuring the rear wing can smoothly unfold in complex airflow conditions.

Description

Technical Field

[0001] This invention belongs to the field of unmanned aerial vehicle (UAV) technology, and specifically relates to a coaxial folding mechanism for UAV wings. Background Technology

[0002] Because of the drone's small size, with a width of only 200mm, and the need to be mounted inside the payload bay, the assembly space is limited. Therefore, the wing installation needs to ensure that it can be fixed within the limited space after folding. The width of the folded wing cannot exceed the width of the drone's fuselage, while the height of the folded wing is sufficient to fit inside the payload bay without interfering with it. If the previously designed method of folding and unfolding the left and right wings separately is used, it would be difficult to meet the requirements of assembly position and space.

[0003] The rear wing is a component on an aircraft used to generate lift. By manipulating the flaps and ailerons of the rear wing, the wing shape can be changed, controlling the distribution of lift and drag to increase lift or alter flight attitude. Therefore, in this UAV, the rear wing deployment mechanism is particularly crucial for controlling the folding and unfolding of the rear wing. It needs to be able to smoothly and quickly unfold and lock the rear wing in place during flight, while also ensuring the correct installation angle after unfolding. This is a major challenge in this UAV project, as it relates to whether the aircraft can fly smoothly and stably in the air, and is a key issue that needs to be addressed. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] The technical problem to be solved by the present invention is to provide a coaxial folding mechanism for drone wings to solve the problem of quickly unfolding and locking the rear wing in place during drone flight, while ensuring that the installation angle of the rear wing is correct after unfolding.

[0006] (II) Technical Solution

[0007] To solve the above-mentioned technical problems, the present invention provides a coaxial folding mechanism for the wings of a drone, comprising: a main shaft assembly 1, a right rear wing connecting assembly 2, a left rear wing connecting assembly 3, a thrust bearing 6, and a tension spring 7;

[0008] The spindle assembly 1 includes: spindle 15, flange, locking pin 16, and locking pin cover 17;

[0009] The main shaft 15 is connected to a flange via a thrust bearing 6. The flange is a cylindrical ring. Torsion spring fixing holes are provided on both the upper and lower sides of the flange. Locking pin 16 mounting holes are provided on the front and rear sides of the torsion spring fixing holes. Locking pin 16 and locking spring are provided in the mounting holes. The end of the locking pin 16 is designed to pop out from one end of the flange under the action of the locking spring, and the other end is provided with a locking pin cover 17 to hold the locking spring.

[0010] The right rear wing connecting assembly 2 includes: a right rear wing connecting seat 8, a bearing mounting seat 9, a torsion spring 10, a locking pin sliding bar 11, a rear wing front positioning pin 12, and a rear wing rear positioning pin 13.

[0011] The bearing mounting seat 9 is sleeved on the thrust bearing 6. The right rear wing connecting seat 8 is fixedly connected below the bearing mounting seat 9. The right rear wing connecting seat 8 has a torsion spring rotation slot. A locking pin sliding strip 11 is provided at a position symmetrical to the torsion spring rotation slot. A torsion spring 10 is provided inside the right rear wing connecting seat 8. One end of the torsion spring 10 is inserted into the fixing hole of the bearing mounting seat 9, and the other end of the torsion spring 10 extends out from the torsion spring rotation slot and is inserted into the torsion spring fixing hole on the main shaft 15.

[0012] The rear wing front positioning pin 12 and the rear wing rear positioning pin 13 are fixed at one end to the side end of the right rear wing connecting seat 8, and the other end is inserted into the right rear wing.

[0013] The left rear wing connecting assembly includes: a left rear wing connecting seat 14, a left rear wing bearing mounting seat 9', a left rear wing torsion spring 10', a left rear wing locking pin sliding strip 11', a left rear wing front positioning pin 12', and a left rear wing rear positioning pin assembly 13';

[0014] The left rear wing bearing mounting seat 9' is sleeved on the thrust bearing 6. The left rear wing connecting seat 14 is fixedly connected above the left rear wing bearing mounting seat 9'. The left rear wing connecting seat 14 has a torsion spring rotation slot. A locking pin sliding strip 11' is provided at a position symmetrical to the torsion spring rotation slot. The left rear wing connecting seat 14 has a left rear wing torsion spring 10' inside. One end of the left rear wing torsion spring 10' is inserted into the fixing hole of the left rear wing bearing mounting seat 9', and the other end of the left rear wing torsion spring 10' extends out from the torsion spring rotation slot and is inserted into the torsion spring fixing hole on the main shaft.

[0015] The left rear wing front positioning pin 12' and the left rear wing rear positioning pin 13' are fixed at one end to the side of the left rear wing connecting seat 14, and the other end is inserted into the left rear wing;

[0016] A tension spring 7 is provided between the right rear wing connecting seat 8 and the left rear wing connecting seat 14;

[0017] The main shaft 15 controls the rotation angle of the left and right rear wings. When the left and right rear wings are folded 90° toward the nose of the fuselage, they rotate outward and unfold simultaneously under the combined action of the torsion spring 10, the left rear wing torsion spring 10', and the tension spring 7. When unfolding, the upper and lower locking pins 16 of the main shaft 15 slide along the locking pin sliding strip. When the left and right rear wings are unfolded, the torsion spring rotation slots of the left and right rear wing connecting seats will restrict the rear wings from continuing to deflect after unfolding. At the same time, the upper and lower locking pins 16 of the main shaft 15 pop out and insert into the locking holes of the locking pin sliding strip, so that the left and right rear wings are unfolded 90° and locked.

[0018] The bearing mounting base 9 has four angular holes, including 0°, 30°, 60° and 90°. The preload angle of the torsion spring 10 can be adjusted by adjusting the angle at which the torsion spring 10 is inserted into one end of the bearing mounting base 9.

[0019] The main shaft 15 is provided with a bottom bearing seat 4 at the bottom, which is fixed by tightening the bottom cover 5.

[0020] The locking pin 16 is sealed inside the spindle 15 by the locking pin cover 17, and the end of the locking pin 16 is configured to pop out and lock under the action of the locking pin spring 18.

[0021] Among them, the mounting angle of the right rear wing is adjusted by adjusting the two fixing holes of the front positioning pin 12 and the rear positioning pin 13 of the rear wing at the side end of the right rear wing connecting seat 14.

[0022] Adjust the mounting angle of the left rear wing by adjusting the two fixing holes on the side end of the left rear wing connecting seat 8: the left rear wing front positioning pin 12' and the left rear wing rear positioning pin 13'.

[0023] Specifically, once the left and right rear wings have rotated 90° toward the bullet's nose and folded into place, the torsion springs restrict the torsion angle of the left and right rear wings through their rotating slots, preventing them from rotating any further after they have folded into place.

[0024] (III) Beneficial Effects

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1) It can ensure that the rear wing can be fixed in a limited space after folding, the width of the rear wing after folding does not exceed the width of the fuselage, and the height of the folded wing can meet the requirements of being placed inside the transport bay without interfering with the transport bay.

[0027] 2) During the flight of the drone, the rear wings must be able to overcome its own weight and air resistance to unfold smoothly and lock securely. The left and right rear wing connecting components are equipped with torsion spring drives, and a tension spring is connected between the two components to increase the tension drive, which can ensure that the rear wings can unfold smoothly in complex airflow.

[0028] 3) The left and right rear wing connecting seats are designed with grooves for the torsion spring to rotate when the rear wing rotates, so that the end of the torsion spring connected to the main shaft is restricted to rotate in the rotation groove of the left and right rear wing connecting seats, which can ensure the angle of rotation of the left and right rear wings when folding and unfolding.

[0029] 4) Two locking pin mechanisms are designed at the front and rear of the flange to control the locking of the left and right rear wing connecting components. Locking pin sliding strips are installed on the left and right rear wing connecting seats to ensure that the locking pin on the main shaft slides in the groove of the sliding strip when the rear wing rotates until the rear wing connecting seat rotates with the rear wing into position, and the locking pin is inserted into the locking hole of the sliding strip, thus firmly locking the left and right rear wings into place. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the right rear wing connecting assembly structure;

[0032] Figure 3 Schematic diagram of the right rear wing connecting component structure;

[0033] Figure 4 Schematic diagram of the left rear wing connecting component;

[0034] Figure 5 Schematic diagram of the left rear wing connecting component;

[0035] Figure 6 This is a schematic diagram of the spindle assembly structure. Detailed Implementation

[0036] To make the objectives, contents, and advantages of the present invention clearer, the specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0037] This embodiment provides a coaxial folding mechanism for the wings of a drone, including: a main shaft assembly 1, a right rear wing connecting assembly 2, a left rear wing connecting assembly 3, a thrust bearing 6, and a tension spring 7;

[0038] The spindle assembly 1 includes: spindle 15, flange, locking pin 16, and locking pin cover 17;

[0039] The main shaft 15 is connected to a flange via a thrust bearing 6. The flange is a cylindrical ring. Torsion spring fixing holes are provided on both the upper and lower sides of the flange. Locking pin 16 mounting holes are provided on the front and rear sides of the torsion spring fixing holes. Locking pin 16 and locking spring are provided in the mounting holes. The end of the locking pin 16 is designed to pop out from one end of the flange under the action of the locking spring, and the other end is provided with a locking pin cover 17 to hold the locking spring.

[0040] The right rear wing connecting assembly 2 includes: a right rear wing connecting seat 8, a bearing mounting seat 9, a torsion spring 10, a locking pin sliding bar 11, a rear wing front positioning pin 12, and a rear wing rear positioning pin 13.

[0041] The bearing mounting seat 9 is sleeved on the thrust bearing 6. The right rear wing connecting seat 8 is fixedly connected below the bearing mounting seat 9. The right rear wing connecting seat 8 has a torsion spring rotation slot. A locking pin sliding strip 11 is provided at a position symmetrical to the torsion spring rotation slot. A torsion spring 10 is provided inside the right rear wing connecting seat 8. One end of the torsion spring 10 is inserted into the fixing hole of the bearing mounting seat 9, and the other end of the torsion spring 10 extends out from the torsion spring rotation slot and is inserted into the torsion spring fixing hole on the main shaft 15.

[0042] The rear wing front positioning pin 12 and the rear wing rear positioning pin 13 are fixed at one end to the side end of the right rear wing connecting seat 8, and the other end is inserted into the right rear wing.

[0043] The left rear wing connecting assembly includes: a left rear wing connecting seat 14, a left rear wing bearing mounting seat 9', a left rear wing torsion spring 10', a left rear wing locking pin sliding strip 11', a left rear wing front positioning pin 12', and a left rear wing rear positioning pin assembly 13';

[0044] The left rear wing bearing mounting seat 9' is sleeved on the thrust bearing 6. The left rear wing connecting seat 14 is fixedly connected above the left rear wing bearing mounting seat 9'. The left rear wing connecting seat 14 has a torsion spring rotation slot. A locking pin sliding strip 11' is provided at a position symmetrical to the torsion spring rotation slot. The left rear wing connecting seat 14 has a left rear wing torsion spring 10' inside. One end of the left rear wing torsion spring 10' is inserted into the fixing hole of the left rear wing bearing mounting seat 9', and the other end of the left rear wing torsion spring 10' extends out from the torsion spring rotation slot and is inserted into the torsion spring fixing hole on the main shaft.

[0045] The left rear wing front positioning pin 12' and the left rear wing rear positioning pin 13' are fixed at one end to the side of the left rear wing connecting seat 14, and the other end is inserted into the left rear wing;

[0046] A tension spring 7 is provided between the right rear wing connecting seat 8 and the left rear wing connecting seat 14;

[0047] The main shaft 15 controls the rotation angle of the left and right rear wings. When the left and right rear wings are folded 90° toward the nose of the fuselage, they rotate outward and unfold simultaneously under the combined action of the torsion spring 10, the left rear wing torsion spring 10', and the tension spring 7. When unfolding, the upper and lower locking pins 16 of the main shaft 15 slide along the locking pin sliding strip. When the left and right rear wings are unfolded, the torsion spring rotation slots of the left and right rear wing connecting seats will restrict the rear wings from continuing to deflect after unfolding. At the same time, the upper and lower locking pins 16 of the main shaft 15 pop out and insert into the locking holes of the locking pin sliding strip, so that the left and right rear wings are unfolded 90° and locked.

[0048] The bearing mounting base 9 has four angular holes, including 0°, 30°, 60° and 90°. The preload angle of the torsion spring 10 can be adjusted by adjusting the angle at which the torsion spring 10 is inserted into one end of the bearing mounting base 9.

[0049] The main shaft 15 is provided with a bottom bearing seat 4 at the bottom, which is fixed by tightening the bottom cover 5.

[0050] The locking pin 16 is sealed inside the spindle 15 by the locking pin cover 17, and the end of the locking pin 16 is configured to pop out and lock under the action of the locking pin spring 18.

[0051] Among them, the mounting angle of the right rear wing is adjusted by adjusting the two fixing holes of the front positioning pin 12 and the rear positioning pin 13 of the rear wing at the side end of the right rear wing connecting seat 14.

[0052] Adjust the mounting angle of the left rear wing by adjusting the two fixing holes on the side end of the left rear wing connecting seat 8: the left rear wing front positioning pin 12' and the left rear wing rear positioning pin 13'.

[0053] Specifically, once the left and right rear wings have rotated 90° toward the bullet's nose and folded into place, the torsion springs restrict the torsion angle of the left and right rear wings through their rotating slots, preventing them from rotating any further after they have folded into place.

[0054] Features of this invention:

[0055] I. Design of Locking Mechanism on Spindle

[0056] The spindle is designed with locking mechanisms in both the up and down directions, which can simultaneously control the locking of the left and right rear wings. The locking pin moves up and down inside the spindle through a locking pin cover, and the end of the locking pin can pop out and lock under the action of an internal compression spring.

[0057] II. Design of left and right wing connection components

[0058] The left and right rear wing connecting assemblies are connected to the main shaft via a thrust bearing coaxially. A torsion spring fixing boss on the main shaft rotates within the rotating slots of the left and right rear wing connecting seats, limiting the folding and unfolding of the left and right rear wings. A locking pin sliding strip design is incorporated on the rear wing connecting seats; after the locking pin sliding strip rotates to its designated position with the rear wing connecting seats, the main shaft locking pin aligns perfectly with the locking hole of the sliding strip and inserts to lock the left and right rear wings.

[0059] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A coaxial folding mechanism for the wings of a drone, characterized in that, include: Main shaft assembly (1), right rear wing connecting assembly (2), left rear wing connecting assembly (3), thrust bearing (6), tension spring (7); The spindle assembly (1) includes: spindle (15), flange, locking pin (16), and locking pin cover (17). The main shaft (15) is connected to the flange through the thrust bearing (6). The flange is set as a cylindrical ring. Torsion spring fixing holes are opened on both the upper and lower sides of the flange. Locking pin (16) mounting holes are opened on the front and rear sides of the torsion spring fixing holes. Locking pin (16) and locking spring are provided in the mounting holes. The end of the locking pin (16) is set to be able to pop out from one end of the flange under the action of the locking spring. The other end is provided with a locking pin cover (17) to hold the locking spring. The right rear wing connecting assembly (2) includes: right rear wing connecting seat (8), bearing mounting seat (9), torsion spring (10), locking pin sliding bar (11), rear wing front positioning pin (12), and rear wing rear positioning pin (13). The bearing mounting seat (9) is sleeved on the thrust bearing (6). The right rear wing connecting seat (8) is fixedly connected below the bearing mounting seat (9). The right rear wing connecting seat (8) has a torsion spring rotation slot. A locking pin sliding strip (11) is provided at a position symmetrical to the torsion spring rotation slot. A torsion spring (10) is provided inside the right rear wing connecting seat (8). One end of the torsion spring (10) is inserted into the fixing hole of the bearing mounting seat (9), and the other end of the torsion spring (10) extends out from the torsion spring rotation slot and is inserted into the torsion spring fixing hole on the flange. The front positioning pin (12) of the rear wing and the rear positioning pin (13) of the rear wing are fixed at one end to the side of the right rear wing connecting seat (8), and the other end is inserted into the right rear wing; The left rear wing connecting assembly comprises: a left rear wing connecting seat (14), a left rear wing bearing mounting seat (9'), a left rear wing torsion spring (10'), a left rear wing locking pin sliding strip (11'), a left rear wing front positioning pin (12'), and a left rear wing rear positioning pin (13'); The left rear wing bearing mounting seat (9') is sleeved on the thrust bearing (6). The left rear wing connecting seat (14) is fixedly connected above the left rear wing bearing mounting seat (9'). The left rear wing connecting seat (14) has a torsion spring rotation slot. A locking pin sliding strip (11') is provided at a position symmetrical to the torsion spring rotation slot. The left rear wing connecting seat (14) has a left rear wing torsion spring (10') inside. One end of the left rear wing torsion spring (10') is inserted into the fixing hole of the left rear wing bearing mounting seat (9'), and the other end of the left rear wing torsion spring (10') extends out from the torsion spring rotation slot and is inserted into the torsion spring fixing hole on the main shaft. The left rear wing front positioning pin (12') and the left rear wing rear positioning pin (13') are fixed at one end to the side of the left rear wing connecting seat (14), and the other end is inserted into the left rear wing; A tension spring (7) is provided between the right rear wing connecting seat (8) and the left rear wing connecting seat (14). The main shaft (15) controls the rotation angle of the left and right rear wings. When the left and right rear wings are folded 90° toward the nose of the fuselage, they rotate outward and unfold simultaneously under the combined action of the torsion spring (10), the left rear wing torsion spring (10'), and the tension spring (7). When unfolding, the two locking pins (16) of the main shaft (15) slide along the locking pin sliding strip respectively. When the left and right rear wings are unfolded, the torsion spring rotation slot of the left and right rear wing connecting seat will restrict the rear wings from continuing to deflect after unfolding. At the same time, the two locking pins (16) of the main shaft (15) pop out and insert into the locking hole of the locking pin sliding strip, so that the left and right rear wings unfold 90° and lock.

2. The coaxial folding mechanism for UAV wings as described in claim 1, characterized in that, The bearing mounting base (9) has four angle holes, including 0°, 30°, 60° and 90°. The preload angle of the torsion spring (10) can be adjusted by adjusting the angle at which the torsion spring (10) is inserted into one end of the bearing mounting base (9).

3. The coaxial folding mechanism for UAV wings as described in claim 1, characterized in that, The bottom of the main shaft (15) is provided with a bottom bearing seat (4), which is fixed by tightening the bottom cover (5).

4. The coaxial folding mechanism for UAV wings as described in claim 1, characterized in that, The locking pin (16) is sealed inside the flange by the locking pin cover (17), and the end of the locking pin (16) is configured to pop out and lock under the action of the locking pin spring (18).

5. The coaxial folding mechanism for UAV wings as described in claim 1, characterized in that, The mounting angle of the right rear wing is adjusted by adjusting the two fixing holes of the front positioning pin (12) and the rear positioning pin (13) of the right rear wing connecting seat (8). The mounting angle of the left rear wing can be adjusted by adjusting the two fixing holes of the left rear wing front positioning pin (12') and the left rear wing rear positioning pin (13') on the side end of the left rear wing connector (14).

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