A rotor folding device with variable pitch

Abstract

The present invention relates to a variable-pitch rotor folding device, comprising a blade assembly, a main shaft assembly, a lifting assembly, and a folding assembly. The blade assembly is fixedly mounted on the upper end of the main shaft assembly, the main shaft assembly comprising a main shaft and a driving unit, the driving unit being disposed on the main shaft; the lifting assembly is mounted on the main shaft, the lifting assembly is transmission-connected to the folding assembly, the blade assembly is mounted on the folding assembly; the lifting assembly drives the folding assembly to fold or unfold, and the top end of the lifting assembly is fixedly mounted with an elastic reset member that abuts against the lifting assembly. The present invention is provided with a folding assembly and a lifting assembly. When the rotor is folded, the fixed ring of the swash plate moves upward, driving the lifting assembly to move upward. The lifting assembly and the folding assembly cooperate through transmission. As the lifting assembly moves upward, the folding assembly rotates downward, and the blade assembly mounted on the folding assembly folds accordingly, thereby reducing the air resistance of the aircraft, improving energy utilization, and extending flight time.

Description

Technical Field

[0001] The invention belongs to the field of aircraft rotors, and relates to a rotor with a variable pitch, in particular to a rotor folding device with a variable pitch. Background Art

[0002] With the rapid development of aircraft technology, tail-seat vertical take-off and landing aircraft have attracted much attention since their advent; they not only have the vertical take-off and landing and hovering functions of helicopters, but also have the advantages of fixed-wing aircraft such as fast speed and long flight time.

[0003] Traditional tail-seat aircraft use a variable-pitch rotor mechanism at the nose, similar to that of a helicopter, to achieve vertical take-off and landing and hovering. However, this rotor mechanism creates significant air resistance when the aircraft uses fixed-wing mode for forward flight, resulting in reduced energy utilization and shortened flight time.

[0004] To this end, we propose a variable-pitch rotor folding device to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a variable-pitch, foldable rotor folding device.

[0006] In order to solve the above problems, the technical solution of the present invention is:

[0007] A variable-pitch rotor folding device comprises a blade assembly, a main shaft assembly, a lifting assembly and a folding assembly, wherein at least two blade assemblies are fixedly mounted on the upper end portion of the main shaft assembly, the main shaft assembly comprises a main shaft and a driving portion, and the driving portion is arranged on the main shaft; the lifting assembly is mounted on the main shaft, and the lifting assembly is respectively connected to at least two folding assemblies in a transmission manner, and the blade assembly is mounted on the folding assembly; the lifting assembly drives the folding assembly to fold or unfold, and an elastic reset member that abuts against the lifting assembly is fixedly mounted on the top end portion of the lifting assembly.

[0008] In a further embodiment, the driving part includes a main ball joint, a tilting disk stationary ring, a tilting disk movable ring and a main shaft swivel seat. The main shaft is coaxially movably installed with the main ball joint. The outer edge of the main ball joint is hinged with the tilting disk stationary ring and the tilting disk movable ring in sequence from bottom to top. The main shaft is fixedly installed on the main shaft above the tilting disk movable ring. The main shaft swivel seat drives the tilting disk movable ring to rotate through at least one group of rotating components.

[0009] In a further embodiment, the lifting assembly includes a lifting sleeve and a lifting rod, the lifting sleeve is coaxially sleeved on the main shaft located above the main shaft swivel seat, at least two upper ends of the lifting rods are fixedly mounted on the side of the lifting sleeve, and the lower end of the lifting rod is movably inserted in the main shaft swivel seat and extends downward for a section.

[0010] In a further embodiment, the folding assembly is installed in the hub shell of the rotor; the folding assembly includes a gear block, a connecting shaft, a half gear column, a folding ball joint, a positioning shaft and a connecting disk, the gear block is fixedly sleeved on the upper end of the lifting sleeve, and gear teeth are formed on at least two sides of the gear block; the connecting shaft is fixedly installed on the main shaft in a transverse and vertical manner, the connecting shaft is sequentially passed through the half gear column, the folding ball joint and the connecting disk, the folding ball joint is coaxially fixed with the connecting shaft, the positioning shaft longitudinally perpendicular to the connecting shaft is coaxially fixed on the folding ball joint, and the two ends of the positioning shaft are respectively fixed in the hub shell; the half gear column and the connecting disk hold the folding ball joint tightly;

[0011] The gear teeth of the gear block are engaged with the half gear column, and the gear block moves up and down to drive the half gear column and the connecting plate to rotate around the positioning axis.

[0012] In a further embodiment, at least two sets of pitch change assemblies are installed on the main shaft, and the pitch change assembly includes a pitch change arm and a pitch change rod. One end of the pitch change rod is hinged to the outer side surface of the inclined disk dynamic ring, and the other end of the pitch change rod is hinged to one end of the laterally arranged pitch change arm, and the other end of the pitch change arm is fixedly mounted on the blade assembly.

[0013] In a further embodiment, the pitch change arm located at the end of the blade assembly is radially formed with a pitch change arm groove for accommodating the connecting shaft, the connecting plate is radially formed with a connecting plate groove for accommodating the connecting shaft, and the upper and lower ends of the half gear column are respectively radially formed with a first groove and a second groove for accommodating the connecting shaft; the tooth surfaces of the gear blocks are each formed with a gear block groove for accommodating the connecting shaft.

[0014] In a further embodiment, at least one set of rotating components is installed on the main shaft, and the rotating components include a connecting arm and an anti-torsion arm, one end of the connecting arm is hinged to the outer side surface of the main shaft rotating seat, and the other end of the connecting arm is hinged to one end of the anti-torsion arm, and the other end of the anti-torsion arm is installed on the outer side surface of the inclined disk ring.

[0015] In a further embodiment, a limiting assembly is fixedly mounted on the top end of the lifting sleeve, and the limiting assembly is used to limit the blade assembly to remain in an expanded state during use.

[0016] In a further embodiment, the limiting assembly includes a limiting ball pendulum, a limiting boss, a limiting spring, and a limiting hole. At least two limiting holes are radially formed on the top end of the lifting sleeve. One end of the limiting spring is fixedly connected to the limiting hole, and the other end of the limiting spring is fixedly connected to the limiting ball pendulum. The limiting boss is formed on the lifting sleeve at the lower end of the limiting hole.

[0017] The limiting ball is located in the limiting hole when the limiting spring is in a relaxed state;

[0018] The limiting ball pendulum is located on the limiting boss when the limiting spring is in a stretched state, and the limiting ball pendulum limits the lifting sleeve from moving upward.

[0019] In a further embodiment, a hub shell slideway is formed on the top end of the inner side of the hub shell for cooperating with the limiting boss to slide up and down, and a hub shell ball groove corresponding to the diameter of the limiting ball pendulum is formed in the middle of the hub shell slideway, and the diameter of the hub shell ball groove is greater than the width of the hub shell slideway;

[0020] One end portion of at least two connecting rods is fixedly mounted on the lower end portion of the hub shell, and the other end of the connecting rod is fixedly mounted on the main shaft rotary seat.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention is provided with a folding assembly and a lifting assembly. When the aircraft uses the fixed-wing mode for flight, the fixed ring of the swash plate moves upward, driving the lifting assembly to move upward. The lifting assembly and the folding assembly cooperate through transmission. When the lifting assembly moves upward, the folding assembly rotates downward, and the blade assembly installed on the folding assembly folds up accordingly, thereby reducing the air resistance of the aircraft, improving energy utilization, and extending flight time.

[0023] 2. The present invention is provided with a limiting assembly. When the blade assembly is in the expanded state, the main shaft rotates, and the limiting ball pendulum slides out of the limiting hole under the action of centrifugal force, enters the ball groove of the hub shell and is located on the limiting boss. Since the diameter of the limiting ball pendulum is larger than the width of the hub shell slideway, the limiting ball pendulum can limit the upward movement of the lifting sleeve when it is located in the ball groove of the hub shell, thereby limiting the blade assembly to remain in the expanded state during rotation, and the operation is stable and reliable with good safety.

[0024] 3. The present invention provides a return spring at the top end of the lifting assembly. When in the folded state, the lifting assembly moves upward to squeeze the return spring. When the blade assembly switches from the folded state to the unfolded state, the fixed ring of the tilting plate descends, and the return spring is released to press the lifting assembly downward, thereby unfolding the blade assembly. The structure is sophisticated and the energy consumption is low.

[0025] 4. The design of the present invention is scientific and reasonable, the conception is ingenious, and the structure is simple. It not only has the function of variable pitch, but also can fold the blades, and has the value of wide promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a variable-pitch rotor folding device in an unfolded state;

[0027] Figure 2 This is an exploded schematic diagram of the deployed structure of a variable-pitch rotor folding device;

[0028] Figure 3 This is an exploded schematic diagram of the folded state structure of a variable pitch rotor folding device;

[0029] Figure 4 A front view of a half-gear column of a variable-pitch rotor folding device;

[0030] Figure 5 A schematic diagram of a natural state of a limiting component of a variable-pitch rotor folding device;

[0031] Figure 6 A schematic diagram of the limiting state of a limiting component of a variable-pitch rotor folding device;

[0032] Figure 7 A side view of a limit assembly of a variable-pitch rotor folding device;

[0033] Figure 8 A flow chart of a method for operating a variable-pitch rotor folding device;

[0034] Figure 9 Schematic diagram of the initial angle of a variable-pitch rotor folding device;

[0035] Figure 10 The figure is a schematic diagram of the folded state of a variable-pitch rotor folding device.

[0036] In the figure: 1. Hub shell; 11. Hub shell slideway; 12. Hub shell ball groove; 2. Blade assembly; 21. Blade seat; 22. Blade; 3. Main shaft assembly; 31. Main ball joint; 32. Swash plate fixed ring; 33. Swash plate moving ring; 34. Main shaft swivel seat; 35. Main shaft; 4. Pitch change assembly; 41. Pitch change arm; 411. Pitch change arm groove; 42. Pitch change rod; 5. Rotating assembly; 51. Connecting arm; 52. Anti-torsion arm; 6. Lifting assembly; 61. Lifting Lowering sleeve; 62, lifting rod; 7, folding assembly; 71, gear block; 711, gear block groove; 72, connecting shaft; 73, half gear column; 731, first groove; 732, second groove; 74, folding ball joint; 75, positioning shaft; 76, connecting plate; 761, connecting plate groove; 8, limiting assembly; 81, limiting ball pendulum; 82, limiting boss; 83, limiting spring; 84, limiting hole; 9, reset spring; 10, connecting rod; α, initial angle. DETAILED DESCRIPTION

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] Example 1:

[0039] A variable pitch rotor folding device, such as Figures 1 to 3As shown, it includes a hub shell 1, a blade assembly 2 and a main shaft assembly 3, a pitch-changing assembly 4 and a rotating assembly 5. The upper end of the main shaft assembly 3 is fixedly mounted with the hub shell 1, and at least two blade assemblies 2 are mounted on the side of the hub shell 1. The embodiments and drawings take two blade assemblies 2 as an example; the rotating assembly 5 and at least two groups of pitch-changing assemblies 4 are mounted on the main shaft assembly 3, and the pitch-changing assembly 4 is connected to the blade assembly 2; the upper end of the main shaft assembly 3 is mounted with a lifting assembly 6, and at least two folding assemblies 7 are fixedly mounted on the lifting assembly 6, and the folding assembly 7 is mounted with the blade assembly 2, and the number of the folding assemblies 7 is consistent with that of the blade assembly 2; the top end of the lifting assembly 6 is mounted with a limiting assembly 8, and the top end of the lifting assembly 6 is fixedly mounted with an elastic limiting member that resists the lifting assembly 6, and the elastic limiting member is a reset spring 9.

[0040] The main shaft assembly 3 includes a main ball joint 31, a tilting disk fixed ring 32, a tilting disk movable ring 33, a main shaft swivel seat 34 and a main shaft 35. The main ball joint 31 is coaxially mounted on the main shaft 35. The outer edge of the main ball joint 31 is hinged with the tilting disk fixed ring 32 and the tilting disk movable ring 33 from bottom to top. The main ball joint 31, the tilting disk fixed ring 32 and the tilting disk movable ring 33 can slide up and down along the main shaft 35. The tilting disk fixed ring 32 can tilt around the main ball joint 31. The tilting disk movable ring 33 is driven by the tilting disk fixed ring 32 to complete the tilting. The main shaft 35 above the tilting disk movable ring 33 is fixedly mounted with a main shaft swivel seat 34. The main shaft swivel seat 34 drives the tilting disk movable ring 33 to rotate through at least one set of rotating components 5.

[0041] The rotating assembly 5 includes a connecting arm 51 and an anti-torsion arm 52. One end of the connecting arm 51 is hinged to the outer side surface of the spindle swivel 34, and the other end of the connecting arm 51 is hinged to one end of the anti-torsion arm 52. The other end of the anti-torsion arm 52 is installed on the outer side surface of the tilting disk rotating ring 33. When the spindle 35 drives the spindle swivel 34 to rotate, the rotating assembly 5 causes the tilting disk rotating ring 33 to rotate together.

[0042] The pitch change assembly 4 includes a pitch change arm 41 and a pitch change rod 42. One end of the pitch change rod 42 is hinged to the outer side of the tilting disk ring 33, and the other end of the pitch change rod 42 is hinged to one end of the pitch change arm 41. The other end of the pitch change arm 41 is fixedly mounted on the blade assembly 2. The end of the pitch change arm 41 mounted on the blade assembly 2 is a cylindrical structure, and a pitch change arm groove 411 is radially formed on the cylindrical structure; the blade assembly 2 includes a blade seat 21 and a blade 22, and the blade 22 is mounted in the blade seat 21; the blade seat 21 is fixedly mounted on the pitch change arm 41.

[0043] The lifting assembly 6 comprises a lifting sleeve 61 and lifting rods 62. The lifting sleeve 61 is coaxially mounted on the spindle 35 located above the spindle swivel 34. The upper ends of at least two lifting rods 62 are fixedly mounted on the side of the lifting sleeve 61. The lower ends of the lifting rods 62 are movably inserted into the spindle swivel 34 and extend downward. The lifting assembly 6 can be driven to rotate together with the spindle 35. When the swash plate fixed ring 32 pushes the swash plate movable ring 33 upward until it contacts the lower ends of the lifting rods 62, the swash plate movable ring 33 pushes the lifting rods 62 upward, thereby driving the lifting sleeve 61 upward. Preferably, the two lifting rods 62 are symmetrically arranged.

[0044] like Figure 4 、 Figure 9 and Figure 10 As shown, the folding assembly 7 includes a gear block 71, a connecting shaft 72, a half gear column 73, a folding ball joint 74, a positioning shaft 75 and a connecting plate 76. The gear block 71 is fixedly mounted on the upper part of the lifting sleeve 61. The side of the gear block 71 corresponding to the blade assembly 2 is formed with gear teeth, and the gear block groove 711 with the same height as the gear block 71 is longitudinally formed on the gear tooth surface; one end of the connecting shaft 72 is fixedly mounted on the main shaft 35 horizontally and vertically, and the other end of the connecting shaft 72 passes through the gear block groove 711. When the gear block 71 moves up and down, the connecting shaft 72 can slide in the gear block groove 711; the connecting shaft 72 is sequentially passed through the half gear column 73, the folding ball joint 74 and the connecting plate 76. The folding ball joint 74 is coaxially fixed with the connecting shaft 72, and a positioning shaft 75 longitudinally perpendicular to the connecting shaft 72 is coaxially fixed on the folding ball joint 74. The two ends of the positioning shaft 75 are respectively fixed It is fixedly installed inside the hub shell 1 to prevent the blade assembly 2 from shifting when folded; the half gear column 73 and the connecting disk 76 hold the folding ball joint 74 tightly; the lower end of the outer side of the half gear column 73 is formed with gear teeth for meshing with the gear block 71, and the gear block 71 moves up and down to drive the half gear column 73 and the connecting disk 76 to rotate around the positioning axis 75; the upper end of the half gear column 73 is formed with a first groove 731 for cooperating with the connecting shaft 72 when folded; the lower end of the half gear column 73 is formed with a second groove 732 corresponding to the position of the first groove 731, for cooperating with the gear block groove 711 to accommodate the connecting shaft 72; a connecting disk groove 761 is radially formed on the connecting disk 76 for cooperating with the connecting shaft 72 when folded; there is an initial angle α between the center line of the pitch arm groove 411 and the center line of the connecting disk groove 761, and preferably, the initial angle α ranges from 15° to 20°. The maximum rotation angle of the pitch change arm 41 can make the center line of the pitch change arm groove 411 coincide with the center line of the connecting plate groove 761, that is, the initial angle α is 0°.

[0045] like Figure 5-7As shown, the limiting assembly 8 includes a limiting ball pendulum 81, a limiting boss 82, a limiting spring 83 and a limiting hole 84. The top end of the lifting sleeve 61 is radially provided with at least two limiting holes 84. One end of the limiting spring 83 is fixedly installed in the limiting hole 84, and the other end of the limiting spring 83 is fixedly connected to the limiting ball pendulum 81; a limiting boss 82 is respectively formed on the lifting sleeve 61 at the lower end of each limiting hole 84, and the top end of the limiting boss 82 is in the same horizontal plane as the lower side surface of the limiting hole 84.

[0046] The top end of the inner side of the hub shell 1 is provided with a hub shell slide 11 for cooperating with the limiting boss 82 to slide up and down. The middle of the hub shell slide 11 is provided with a hub shell ball groove 12 corresponding to the diameter of the limiting ball pendulum 81, and the diameter of the hub shell ball groove 12 is greater than the width of the hub shell slide 11; when the blade assembly 2 is in a folded or unfolded non-rotated state, the limiting spring 83 is in a relaxed state, and the limiting ball pendulum 81 is located in the limiting hole 84; the maximum downward folding angle of the blade assembly 2 is between 70° and 90°.

[0047] The lower end of the hub shell 1 is fixedly mounted with one end of at least two connecting rods 10, and the other end of the connecting rod 10 is fixedly mounted on the main shaft swivel seat 34, so that the hub shell 1 is fixed on the main shaft 35, preventing the hub shell 1 from moving when the lifting assembly 6 moves, thereby preventing the reset spring 9 from losing its reset function.

[0048] A method for operating a variable pitch rotor folding device, such as Figure 8 As shown, the following steps are included:

[0049] Step S101: Rotor pitch change

[0050] Furthermore, step S101 specifically includes the following two situations:

[0051] Step S102: Adjust the collective distance

[0052] The actuator (not shown in the figure) is used to make the swash plate fixed ring 32 push the swash plate movable ring 33 to move upward, and the pitch change rod 42 hinged on the swash plate movable ring 33 moves upward accordingly, and the pitch change arm 41 hinged to the pitch change rod 42 rotates, and the blade assembly 2 fixedly connected to the pitch change arm 41 rotates accordingly, completing the operation of adjusting the collective pitch.

[0053] Step S103: Periodic pitch variation

[0054] The actuator is used to make the swash plate fixed ring 32 push the swash plate movable ring 33 to tilt to a certain angle. During the rotation process, the swash plate movable ring 33 drives the pitch change rod 42 to move up and down periodically, and the pitch change arm 41 hinged to the pitch change rod 42 rotates periodically. The blade assembly 2 fixedly connected to the pitch change arm 41 rotates periodically accordingly, completing the periodic pitch change operation.

[0055] Step S104: Rotor folding

[0056] On the basis of step S102, the actuator enables the swash plate fixed ring 32 to continue to push the swash plate movable ring 33 upward. After moving upward for a distance, the swash plate movable ring 33 contacts the lifting rod 62, pushing the lifting rod 62 to move upward. The lifting rod 62 drives the lifting sleeve 61 to move upward, and the lifting sleeve 61 compresses the reset spring 9; the gear block 71 and the half gear column 73 fixedly mounted on the lifting sleeve 61 drive the connecting plate 76 to rotate downward through transmission cooperation; at the same time, the pitch change rod 42 hinged on the swash plate movable ring 33 moves upward accordingly, and the pitch change arm 41 hinged to the pitch change rod 42 rotates, connecting the pitch change arm groove 411 with the connecting plate groove 761, so that the connecting shaft 72 passes smoothly through the pitch change arm groove 411; the pitch change arm 41 drives the blade assembly 2 to continue to fold downward to the maximum folding angle.

[0057] Step S105: Rotor deployment

[0058] The actuator moves the fixed ring 32 of the swash plate downward, and the movable ring 33 of the swash plate moves downward accordingly. The return spring 9 is no longer stressed and returns to its natural state, thereby pushing the lifting sleeve 61 downward. The gear block 71 and the half gear column 73 fixedly mounted on the lifting sleeve 61 cooperate with each other through transmission, driving the connecting plate 76 to rotate upward. At the same time, the pitch change rod 42 hinged on the swash plate movable ring 33 moves downward accordingly, and the pitch change arm 41 hinged to the pitch change rod 42 rotates, causing the pitch change arm groove 411 to be misaligned with the connecting plate groove 761, and the connecting shaft 72 can no longer pass through the pitch change arm groove 411.

[0059] After the blade assembly 2 is unfolded, the main shaft 35 drives the lifting sleeve 61 to rotate, and the limiting ball pendulum 81 located in the lifting sleeve 61 slides out of the limiting hole 84 under the action of centrifugal force, enters the hub shell ball groove 12 and is located on the limiting boss 82. Since the diameter of the limiting ball pendulum 81 is larger than the width of the hub shell slide 11, the limiting ball pendulum 81 can limit the upward movement of the lifting sleeve 61 when it is located in the hub shell ball groove 12, thereby limiting the blade assembly 2 to remain in the unfolded state during rotation.

[0060] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A variable-pitch rotor folding device, comprising a blade assembly (2) and a main shaft assembly (3), wherein at least two blade assemblies (2) are fixedly mounted on the upper end of the main shaft assembly (3), and the main shaft assembly (3) comprises a main shaft (35) and a drive unit, wherein the drive unit is provided on the main shaft (35), and is characterized in that: The invention also comprises a lifting assembly (6) and a folding assembly (7), wherein the lifting assembly (6) is mounted on the main shaft (35), the lifting assembly (6) is respectively connected to at least two folding assemblies (7) in a transmission manner, and the paddle assembly (2) is mounted on the folding assembly (7); the lifting assembly (6) drives the folding assembly (7) to fold or unfold, and an elastic reset member that abuts against the lifting assembly (6) is fixedly mounted on the top end of the lifting assembly (6); The driving part comprises a main ball joint (31), a tilting disk fixed ring (32), a tilting disk dynamic ring (33) and a main shaft rotary seat (34); the main shaft (35) is coaxially movably mounted with the main ball joint (31); the outer edge of the main ball joint (31) is hingedly connected to the tilting disk fixed ring (32) and the tilting disk dynamic ring (33) in sequence from bottom to top; the main shaft rotary seat (34) is fixedly mounted on the main shaft (35) above the tilting disk dynamic ring (33); the main shaft rotary seat (34) drives the tilting disk dynamic ring (33) to rotate through at least one set of rotating components (5); The lifting assembly (6) includes a lifting sleeve (61), and the lifting sleeve (61) is coaxially sleeved on the main shaft (35) located above the main shaft rotating seat (34); The folding assembly (7) is installed in the hub shell (1) of the rotor; the folding assembly (7) includes a gear block (71), a connecting shaft (72), a half gear column (73), a folding ball joint (74), a positioning shaft (75) and a connecting plate (76); the gear block (71) is fixedly sleeved on the upper part of the lifting sleeve (61); at least two side surfaces of the gear block (71) are formed with gear teeth; the connecting shaft (72) is fixedly installed on the main shaft (35) in a horizontal and vertical manner; the connecting shaft ( 72) is sequentially passed through the half gear column (73), the folding ball joint (74) and the connecting plate (76); the folding ball joint (74) is fixedly mounted coaxially with the connecting shaft (72); the positioning shaft (75) is fixedly mounted coaxially on the folding ball joint (74) and is longitudinally perpendicular to the connecting shaft (72); the two ends of the positioning shaft (75) are respectively fixedly mounted in the hub shell (1); the half gear column (73) and the connecting plate (76) hold the folding ball joint (74); The gear teeth of the gear block (71) mesh with the half gear column (73), and the gear block (71) moves up and down to drive the half gear column (73) and the connecting disk (76) to rotate around the positioning shaft (75).

2. The variable pitch rotor folding device according to claim 1, characterized in that: The lifting assembly (6) further comprises a lifting rod (62), the upper ends of at least two lifting rods (62) being fixedly mounted on the side of the lifting sleeve (61), and the lower ends of the lifting rods (62) being movably inserted into the spindle swivel seat (34) and extending downward for a section.

3. The variable pitch rotor folding device according to claim 1, characterized in that: At least two sets of pitch change assemblies (4) are installed on the main shaft (35), and the pitch change assembly (4) includes a pitch change arm (41) and a pitch change rod (42). One end of the pitch change rod (42) is hinged to the outer surface of the tilting disk ring (33), and the other end of the pitch change rod (42) is hinged to one end of the pitch change arm (41) arranged transversely, and the other end of the pitch change arm (41) is fixedly installed on the blade assembly (2).

4. The variable-pitch rotor folding device according to claim 3, characterized in that: The pitch change arm (41) located at the end of the blade assembly (2) is radially formed with a pitch change arm groove (411) for accommodating the connecting shaft (72); the connecting disc (76) is radially formed with a connecting disc groove (761) for accommodating the connecting shaft (72); the upper and lower ends of the half gear column (73) are respectively radially formed with a first groove (731) and a second groove (732) for accommodating the connecting shaft (72); and the gear tooth surface of the gear block (71) is formed with a gear block groove (711) for accommodating the connecting shaft (72).

5. The variable pitch rotor folding device according to claim 1, characterized in that: At least one set of rotating components (5) is mounted on the main shaft (35), and the rotating component (5) comprises a connecting arm (51) and an anti-torsion arm (52), one end of the connecting arm (51) is hinged to the outer side surface of the main shaft rotating seat (34), the other end of the connecting arm (51) is hinged to one end of the anti-torsion arm (52), and the other end of the anti-torsion arm (52) is mounted on the outer side surface of the tilting disk ring (33).

6. The variable-pitch rotor folding device according to claim 1, characterized in that: A limiting assembly (8) is fixedly mounted on the top end of the lifting sleeve (61), and the limiting assembly (8) is used to limit the blade assembly (2) to remain in an expanded state during use.

7. The variable-pitch rotor folding device according to claim 6, characterized in that: The limiting assembly (8) includes a limiting ball pendulum (81), a limiting boss (82), a limiting spring (83) and a limiting hole (84); the top end of the lifting sleeve (61) is radially provided with at least two limiting holes (84); one end of the limiting spring (83) is fixedly connected to the limiting hole (84); the other end of the limiting spring (83) is fixedly connected to the limiting ball pendulum (81); the limiting boss (82) is provided on the lifting sleeve (61) at the lower end of the limiting hole (84); The limiting ball pendulum (81) is located in the limiting hole (84) when the limiting spring (83) is in a relaxed state; The limiting ball pendulum (81) is located on the limiting boss (82) when the limiting spring (83) is in a stretched state, and the limiting ball pendulum (81) limits the upward movement of the lifting sleeve (61).

8. The variable-pitch rotor folding device according to claim 7, characterized in that: The top end of the inner side of the hub shell (1) is provided with a hub shell slideway (11) for cooperating with the limiting boss (82) to slide up and down, and the middle of the hub shell slideway (11) is provided with a hub shell ball groove (12) corresponding to the diameter of the limiting ball pendulum (81), and the diameter of the hub shell ball groove (12) is greater than the width of the hub shell slideway (11); One end of at least two connecting rods (10) is fixedly mounted on the lower end of the hub shell (1), and the other end of the connecting rod (10) is fixedly mounted on the main shaft rotary seat (34).

Images