Thrust assembly and aircraft

Abstract

The invention discloses a thrust assembly and an aircraft, and relates to the technical field of aircrafts. The electric engine of the thrust assembly comprises an outer rotor and an inner stator; the propeller hub is fixedly connected with the outer rotor, and the central axis of the propeller hub and the central axis of the outer rotor are collinear; the fixed end of the linear driving assembly is arranged in the propeller hub and fixedly connected with the inner stator, and the output end of the linear driving assembly extends out of the propeller hub in the direction away from the electric engine; the variable-pitch push disc is located on the side, away from the electric engine, of the propeller hub and rotatably connected with the output end through a variable-pitch bearing so as to be driven by the linear driving assembly to reciprocate in the axial direction of the propeller hub. One end of the connecting cable is connected with the connecting part of the fixed end, and the other end of the connecting cable penetrates through the through hole and extends into the inner stator to be connected with the control module. The variable-pitch push disc is arranged right above the propeller hub, so that the structural size of the variable-pitch push disc is not limited by the size of the propeller hub, and the structural strength of the variable-pitch push disc can be improved.

Description

[0001] The present invention is a divisional application of a patent application with an application date of December 5, 2024, an application number of 202411775996.3, and an invention name of “Thrust Assembly and Aircraft”. Technical Field

[0002] The present invention relates to the technical field of aircraft, and in particular to a thrust assembly and an aircraft. Background Art

[0003] For helicopters, rotorcraft or eVTOL (electric Vertical Take-off and Landing) with tilt-rotor configuration, the propeller in its thrust assembly is the component that ultimately generates thrust or lift, and the electric engine drives the propeller to rotate.

[0004] A variable pitch propeller is a propeller that can change the blade angle during flight through a variable pitch assembly. In the related art, the variable pitch assembly includes a variable pitch push plate, which is installed in the hub and moves up and down along the axial direction of the propeller main shaft under the action of the variable pitch motor. The variable pitch push plate is connected to multiple blades through multiple connecting rods, so that when it moves up and down, the corresponding blades are driven to swing relative to the hub through the connecting rods.

[0005] However, due to the limited space in the hub, the size of the pitch-changing push plate is limited, which affects its structural strength, resulting in uneven force on each pitch-changing transmission component, which in turn leads to the need to improve the consistency of blade pitch change. Summary of the invention

[0006] The main purpose of the present invention is to provide a thrust assembly and an aircraft, aiming to solve the technical problem in the related art that the pitch change consistency of the blades needs to be improved due to the variable pitch thrust disc being arranged in the hub.

[0007] To achieve the above object, the present invention provides a thrust assembly, comprising:

[0008] The electric engine comprises an outer rotor and an inner stator, the outer rotor is provided with a through hole, the central axis of the through hole is colinear with the central axis of the thrust assembly, and a control module is arranged in the inner stator;

[0009] A propeller hub, which is fixedly connected to the outer rotor;

[0010] A linear drive assembly, wherein a fixed end of the linear drive assembly is disposed in the propeller hub and fixedly connected to the inner stator, and an output end of the linear drive assembly extends outside the propeller hub in a direction away from the electric motor;

[0011] A variable pitch push plate, which is located on the side of the propeller hub away from the electric engine and is rotatably connected to the output end through a variable pitch bearing so as to reciprocate along the axial direction of the propeller hub under the drive of the linear drive assembly; and

[0012] A connecting cable, one end of which is connected to the connecting portion of the fixed end, and the other end of which passes through the through hole and extends into the inner stator to be connected to the control module.

[0013] In one embodiment, the connecting portion passes through the through hole and is fixedly connected to the inner stator.

[0014] In one embodiment, the linear drive assembly comprises:

[0015] A variable pitch motor, the body of which is arranged in the hub, the variable pitch motor is configured as a fixed end, and the variable pitch motor has a connecting portion;

[0016] A lead screw extends along the axial direction of the propeller hub, one end of the lead screw is connected to the output shaft of the variable pitch motor in the propeller hub, and the other end of the lead screw extends outside the propeller hub in a direction away from the electric motor;

[0017] A moving member, the moving member being threadedly connected to a portion of the lead screw extending outside the hub to form an output end; and

[0018] A telescopic member, one end of which is fixedly connected to the body of the variable pitch motor, and the other end of which is fixedly connected to the moving member, and the telescopic member is suitable for telescoping along the axial direction of the hub.

[0019] In one embodiment, the outer peripheral surface of one end of the moving member close to the hub has a radial protrusion, and the pitch-changing bearing is arranged on a side of the radial protrusion away from the hub;

[0020] The thrust assembly also includes an end cover, which is arranged on a side of the variable pitch bearing away from the radial protrusion;

[0021] The variable pitch push plate is sleeved on the radial outer side of the variable pitch bearing, and the end cover is fixedly connected to the variable pitch push plate.

[0022] In one embodiment, the thrust assembly further comprises:

[0023] At least two blades, the blades are rotatably connected to the peripheral wall of the hub around the pitch axis of the blades, and the at least two blades are evenly spaced along the circumferential direction of the hub;

[0024] At least two variable pitch transmission assemblies are provided, and the at least two variable pitch transmission assemblies correspond to the at least two blades one by one, and the variable pitch transmission assemblies are respectively connected to the variable pitch push plate and the blades, so that the variable pitch push plate drives the blades to swing through the variable pitch transmission assemblies.

[0025] In one embodiment, the paddle comprises:

[0026] A propeller handle, which is rotatably disposed on the propeller hub, and one end of the propeller handle extends radially to the outside of the propeller hub;

[0027] A paddle blade, the paddle blade is fixedly connected to one end of a paddle handle, and the paddle blade is spaced from an outer peripheral wall of a paddle hub so that a portion of the paddle handle is exposed;

[0028] The variable pitch transmission assembly is located radially outside the propeller hub, and one end of the variable pitch transmission assembly is connected to the exposed portion of the propeller handle.

[0029] In one embodiment, the thrust assembly further comprises:

[0030] At least two angle sensors are provided, the at least two angle sensors correspond to the at least two blades one by one, and the angle sensors are arranged at the portions of the blades extending into the hub.

[0031] In one embodiment, the thrust assembly further comprises:

[0032] At least two stabilizing components are suitable for axial extension and contraction along the hub, one end of the stabilizing component is hinged to the outer edge of the variable pitch push plate, the other end of the stabilizing component is hinged to the hub, and at least two stabilizing components are evenly spaced along the circumferential direction of the variable pitch push plate.

[0033] In one embodiment, the number of the stabilizing components is consistent with the number of the blades and corresponds one to one with each other;

[0034] In the circumferential direction of the variable pitch push plate, the stabilizing components and the variable pitch transmission components are arranged alternately with each other.

[0035] In one embodiment, the stabilizing assembly comprises:

[0036] A first connecting arm, one end of which is hinged to the outer edge of the variable pitch push plate; and

[0037] a second connecting arm, one end of the second connecting arm is hinged to the other end of the first connecting arm, the other end of the second connecting arm is hinged to the propeller hub, and an angle is formed between the first connecting arm and the second connecting arm; and

[0038] An elastic member, the elastic member is arranged between the first connecting arm and the second connecting arm;

[0039] The elastic member is a torsion spring, and the torsion spring is sleeved on the hinge shaft between the first connecting arm and the second connecting arm.

[0040] In one embodiment, the pitch-changing transmission assembly includes a pitch-changing connecting rod and a pitch-changing pin, one end of the pitch-changing connecting rod is hinged to the pitch-changing push plate, the other end of the pitch-changing connecting rod is hinged to one end of the pitch-changing pin, and the other end of the pitch-changing pin is fixedly connected to the blade to rotate around the pitch-changing axis of the blade;

[0041] The variable pitch connecting rod includes:

[0042] A fixed section with openings at both axial ends, wherein a receiving cavity communicating with both openings is defined in the fixed section;

[0043] A first moving section, part of which extends from an opening at one end of the fixed section into the accommodating cavity and can move along the axial direction of the fixed section;

[0044] A second moving section, part of which extends from the other end opening of the fixed section into the accommodating cavity and is movable along the axial direction of the fixed section; and

[0045] A distance adjustment structure, part of which is disposed in the accommodating cavity and is respectively connected to the first moving segment and the second moving segment to adjust the distance between the first moving segment and the second moving segment;

[0046] A locking member is respectively matched with the fixed section and the distance adjusting structure to lock the distance adjusting structure.

[0047] In one embodiment, the electric engine further comprises:

[0048] A rear cover, which is arranged on a side of the inner stator facing away from the hub;

[0049] A cooling assembly, the cooling assembly is arranged on a side of the rear cover away from the inner stator;

[0050] An eccentric shaft is rotatably arranged in the central axis hole of the inner stator around its own central axis, the central axis of the eccentric shaft is parallel to the central axis of the central axis hole and is spaced apart from each other, and one end of the eccentric shaft is transmission-connected to the cooling assembly, and the other end of the eccentric shaft is transmission-connected to the outer rotor, so that the outer rotor drives the cooling assembly through the eccentric shaft.

[0051] In one embodiment, the electric engine further comprises:

[0052] An inner gear ring, the inner gear ring is fixedly connected to an end surface of the rotating shaft of the outer rotor close to the inner stator, and the central axis of the inner gear ring is colinear with the central axis of the outer rotor; wherein the rotating shaft is provided with a through hole;

[0053] A matching gear is fixedly sleeved on the other end of the eccentric shaft and meshes with the inner gear ring;

[0054] A support cover, the support cover is arranged in the through hole and fixedly connected to the inner stator, a part of the surface of one end surface of the support cover protrudes to form a protruding portion, and the protruding portion is provided with a wiring hole that penetrates the support cover along the axial direction of the inner stator;

[0055] The protrusions are located radially outside the mating gear and are spaced apart from each other; the wiring hole has an arc-shaped cross section and partially surrounds the mating gear.

[0056] In addition, the present invention also provides an aircraft, the aircraft comprising:

[0057] Aircraft airframe; and

[0058] At least one thrust assembly as described above, the thrust assembly is arranged on the aircraft body.

[0059] In one embodiment, the aircraft is an electric vertical take-off and landing aircraft.

[0060] One or more technical solutions proposed in the present invention have at least the following technical effects:

[0061] Compared with placing the variable pitch push plate inside the hub where the space is limited, in the variable pitch propeller technical solution of the present invention, the linear drive assembly that drives the variable pitch push plate to reciprocate along the axial direction of the hub is placed inside the hub, and the variable pitch push plate is located on the side of the hub away from the electric engine, that is, the variable pitch push plate is placed directly above the hub, so that the structural size of the variable pitch motor is not limited by the size of the hub, thereby improving the structural strength of the variable pitch push plate, so as to improve the uniformity of the structural strength of the variable pitch push plate and improve the consistency of pitch change. In addition, the variable pitch motor is fixedly connected to the inner stator in the hub, and the pitch mechanism is stationary relative to the entire hub and the blades, so that the variable pitch motor can be directly connected to the control module in the inner stator through a connecting cable, thereby realizing the stable transmission of electrical energy and / or control signals required for the operation of the variable pitch motor.

[0062] In addition, in the present invention, the control module that provides electric energy and transmits control signals to the variable pitch motor is integrated into the inner stator, which can facilitate the assembly of the thrust assembly, help reduce the assembly process, and improve assembly efficiency. In addition, the control module of the variable pitch motor and the motor controller of the electric engine are integrated into the inner stator. Through a unified control architecture, the system design is simplified and the control efficiency is improved, the development and maintenance costs are reduced, and the maintainability of the thrust assembly is improved. Of course, it is also convenient to configure the two redundantly, thereby improving safety. In addition, the control module of the variable pitch motor is arranged in the inner stator, which has a high degree of integration in a limited installation space, and the cooling component of the electric engine can also be used to obtain a better cooling effect.

[0063] Furthermore, in the present invention, the eccentric shaft in the thrust assembly is eccentrically arranged in the central shaft hole of the inner stator, thereby leaving enough space for the connection cables to be routed. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0065] Figure 1 A schematic diagram of the structure of the thrust assembly provided by the present invention;

[0066] Figure 2 A schematic diagram of the structure of the electric engine of the thrust assembly provided by the present invention;

[0067] Figure 3 A schematic diagram of the connection between the variable pitch push plate and the linear drive assembly provided by the present invention; the telescopic member is not shown;

[0068] Figure 4 A schematic diagram of a stabilizing assembly of a thrust assembly provided by the present invention;

[0069] Figure 5 A gain schematic diagram of a stabilizing component of a thrust assembly provided by the present invention;

[0070] Figure 6 A schematic diagram of the matching of the lead screw and nut structure of the thrust assembly provided by the present invention;

[0071] Figure 7 A schematic structural diagram of an embodiment of a variable pitch transmission assembly of a thrust assembly provided by the present invention;

[0072] Figure 8 A schematic diagram of the internal structure of the variable pitch connecting rod of the thrust assembly provided by the present invention;

[0073] Fig. 9 A schematic diagram of the pitch adjustment structure of the thrust assembly provided by the present invention;

[0074] Fig.10 A schematic diagram of another embodiment of a variable pitch transmission assembly of a thrust assembly provided by the present invention;

[0075] Fig.11 A schematic cross-sectional view of the structure of the support cover of the thrust assembly provided by the present invention;

[0076] Fig.12 A schematic diagram of an exploded structure of a support cover of a thrust assembly provided by the present invention.

[0077] Description of Figure Numbers:

[0078] 100, electric engine; 110, outer rotor; 111, through hole; 112, rotating shaft; 120, inner stator; 130, rear cover; 140, cooling assembly; 150, eccentric shaft; 161, inner gear ring; 162, matching gear; 171, supporting lower cover; 1711, lower protrusion; 172, supporting upper cover; 1721, upper protrusion; 173, wiring hole; 200, propeller hub; 300, variable pitch push plate; 400, linear drive assembly; 410, variable pitch motor; 420, lead screw; 430, moving part; 440, telescopic part; 431, equal diameter part; 432, radial protrusion; 500, variable pitch transmission assembly; 510, fixed section; 520, first moving section; 521, first A rod body; 522, a second rod body; 523, a first elastic layer; 524, a first protrusion; 531, a fourth rod body; 532, a third rod body; 533, a second elastic layer; 534, a second protrusion; 530, a second moving section; 540, a pitch adjustment structure; 541, a knob portion; 542, a matching portion; 5421, a cam groove; 550, a pitch change pin; 560, a rotating member; 570, a locking member; 580, a connecting rod body; 600, a paddle blade; 610, a paddle handle; 620, a paddle blade; 700, a stabilizing component; 710, a first connecting arm; 720, a second connecting arm; 730, an elastic member; 800, a pitch change bearing; 900, an end cover; 910, an embedded portion; 920, an outer edge of the end cover.

[0079] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0080] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0081] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0082] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0083] For helicopters, rotorcraft or eVTOL (electric Vertical Take-off and Landing) with tilt-rotor configuration, the propeller in its thrust assembly is the component that ultimately generates thrust or lift, and the electric engine drives the propeller to rotate. A variable pitch propeller is a propeller that can change the blade angle through a variable pitch assembly during flight. In the related art, the variable pitch assembly includes a variable pitch push plate, which is installed in the hub and moves up and down along the axial direction of the propeller main shaft under the action of a variable pitch motor. The variable pitch push plate is respectively connected to the multiple blades through a plurality of connecting rods, so that when it moves up and down, the corresponding blades are driven to swing relative to the hub through the connecting rods.

[0084] In addition, when the pitch change push plate is set in the hub, there is usually a linear guide rod on the pitch change push plate to guide and stabilize the pitch change push plate. However, due to the limited space in the hub, the stabilizing effect of the linear guide rod is greatly limited, and it is difficult to ensure the stability of the pitch change push plate's movement. The pitch change push plate is likely to tilt to one side, thereby failing to ensure the consistency of blade pitch change.

[0085] To this end, the present invention provides a thrust assembly, which places a linear drive assembly that drives a variable pitch push plate to reciprocate along the axial direction of the hub inside the hub, and the variable pitch push plate is located on the side of the hub away from the electric motor, that is, the top of the variable pitch push plate is placed directly above the hub, so that the structural size of the variable pitch motor is not limited by the size of the hub, thereby improving the structural strength of the variable pitch push plate, thereby improving the uniformity of the structural strength of the variable pitch push plate, and improving the consistency of pitch change.

[0086] See also Figure 1 This embodiment provides a thrust assembly, which includes an electric motor 100, a hub 200, a variable pitch thrust plate 300, a linear drive assembly 400 and a connecting cable.

[0087] The electric engine 100 includes an outer rotor 110 and an inner stator 120. The outer rotor 110 is provided with a through hole 111. The central axis of the through hole 111 is collinear with the central axis of the outer rotor 110. The inner stator 120 is provided with a control module. The hub 200 is fixedly connected to the outer rotor 110, and the central axis of the hub 200 is collinear with the central axis of the outer rotor 110. The fixed end of the linear drive assembly 400 is provided in the hub 200 and is fixedly connected to the inner stator 120. The linear drive assembly 400 is provided with a fixed end in the hub 200 and is fixedly connected to the inner stator 120. The output end of 00 extends to the outside of the hub 200 in a direction away from the electric motor 100; the variable pitch push plate 300 is located on the side of the hub 200 away from the electric motor 100, and is rotatably connected to the output end through the variable pitch bearing 800, so as to reciprocate along the axial direction of the hub 200 under the drive of the linear drive assembly 400; one end of the connecting cable (not shown) is connected to the connecting part of the fixed end, and the other end of the connecting cable passes through the through hole 111 and extends to the inner stator 120 to be connected to the control module (not shown).

[0088] Specifically, see Figure 2 , the electric engine 100 in this embodiment is an outer rotor motor. The rotor of the outer rotor motor forms an outer rotor 110 on the outside, and the stator forms an inner stator 120 on the inside. Among them, the inner stator 120 includes a stator housing, a stator core and a winding, the stator core is arranged in the stator housing, and the winding is embedded in the stator slot of the stator core. At this time, the axial hole of the stator housing is formed as the central axial hole of the inner stator 120, that is, the central axis of the central axial hole is collinear with the central axis of the inner stator 120. It can be understood that the central axis of the inner stator 120 and the central axis of the outer rotor 110 are both collinear with the central axis of the thrust assembly. Among them, a control module is also provided inside the inner stator 120 to output control signals and provide electrical energy.

[0089] The outer rotor 110 is roughly constructed as a cylindrical member with one side open, and the open side is formed as an open end, so that the inner stator 120 can be installed into the outer rotor 110 from the open end. A plurality of magnetic poles are fixed to the inner circumferential surface of the outer rotor 110. It can be understood that the outer rotor 110 is formed as the front cover of the motor. Correspondingly, the other side of the outer rotor 110 is a mechanical connection end, which is used to connect to the hub 200, so as to transmit force, motion and torque to the hub 200. The mechanical connection end of this embodiment is connected to the hub 200 of the propeller to transmit power so that the propeller generates the lift and thrust required for flight. In this embodiment, it can be considered that the electric motor 100 is located below the hub 200.

[0090] The hub 200 is a part where each blade 600 is installed and combined, and a plurality of blades 600 are evenly installed on the outer peripheral wall of the hub 200. The hub 200 itself is connected to the mechanical connection end of the electric motor 100, so that the hub 200 rotates around its own rotation axis under the drive of the electric motor 100. The rotation axis of the hub 200 itself is the central axis (rotor axis) of the entire thrust assembly.

[0091] The hub 200 is a hollow structure, and its internal space is configured as a receiving hole. A linear drive assembly 400 is installed in the receiving hole. The output end of the linear drive assembly 400 extends upward to the outside of the hub 200 in a direction away from the electric engine 100. It can be understood that the output end of the linear drive assembly 400 reciprocates in the axial direction of the hub 200. The output end is provided with a variable pitch push plate 300, so that the variable pitch push plate 300 is on the side of the hub 200 away from the electric engine 100 (above the hub 200), and reciprocates along the axial direction of the hub 200 under the drive of the output end, that is, it moves closer to or away from the hub 200 above the hub 200. Of course, since the variable pitch push plate 300 is connected to each blade 600 through the variable pitch transmission assembly 500, the central axis of the variable pitch push plate 300 is colinear with the central axis of the hub 200, so that when the variable pitch push plate 300 reciprocates, each blade can be driven to swing around its own variable pitch axis.

[0092] It is understandable that for an aircraft, in order to reduce the weight of the entire machine, the electric engine 100 preferably adopts a single-bearing motor. Specifically, the outer rotor 110 includes a motor front cover and a rotating shaft. A through hole is provided at the geometric center of the motor front cover. One axial end of the rotating shaft is fixedly connected to the through hole of the motor front cover by a bolt group, and the other axial end of the rotating shaft is rotatably connected to one end of the inner stator 120 toward the mechanical connection end through a bearing, so that the outer rotor 110 motor of the motor assembly provided in this embodiment is a single-bearing motor. It should be noted that the rotating shaft hole of the rotating shaft is formed as a through hole 111, which connects the inner and outer spaces of the outer rotor 110, thereby also providing a channel for connecting the fixed end with the inner stator 120.

[0093] For the linear motion provided by the linear drive assembly 400, the fixed end is the stationary part, and the output end is the part that performs linear motion, that is, the output end performs linear motion relative to the fixed end. In this embodiment, the fixed end is fixedly connected to the inner stator 120, so that the linear drive assembly 400 does not rotate with the hub 200 in the hub 200. At this time, the variable pitch push plate 300 and the output end are matched through the variable pitch bearing 800, so that the variable pitch push plate 300 rotates with the hub 200 while the linear drive assembly 400 remains relatively stationary.

[0094] It is understandable that, since the linear drive assembly 400 is fixedly connected to the inner stator 120, there is no relative movement between the two, and therefore, the fixed end and the control module can be connected via a connecting cable. It is understandable that the connecting cable can be a power supply cable, a communication cable, or a power supply and communication two-in-one cable, and this embodiment does not limit this.

[0095] It is not difficult to see that, compared with the limited space of placing the variable pitch push plate 300 inside the hub 200, in the variable pitch propeller technical solution of this embodiment, the linear drive component 400 that drives the variable pitch push plate 300 to reciprocate along the axial direction of the hub 200 is placed inside the hub 200, and the variable pitch push plate 300 is located on the side of the hub 200 away from the electric motor 100, that is, the variable pitch push plate 300 is placed directly above the hub 200, so that the structural size of the variable pitch motor 410 is not limited by the size of the hub 200, thereby improving the structural strength of the variable pitch push plate 300, so as to improve the uniformity of the structural strength of the variable pitch push plate 300 and improve the consistency of pitch change.

[0096] In addition, the pitch-changing push plate 300 is placed on top, and there is enough space around the pitch-changing push plate 300 for installing other pitch-changing auxiliary structures, which is further beneficial to the pitch-changing reliability.

[0097] In addition, in this embodiment, the linear drive assembly 400 is separated from the movement of the hub 200 by the variable pitch bearing 800, and the linear drive assembly 400 can be directly electrically connected to the control module on the inner stator 120 of the electric motor 100 through a connecting cable to achieve stable and reliable power supply and signal transmission.

[0098] In addition, in this embodiment, the control module that provides electric energy and transmits control signals to the variable pitch motor is integrated into the motor controller in the inner stator 120, which can facilitate the assembly of the thrust assembly, help reduce the assembly process, and improve assembly efficiency. In addition, the linear drive assembly 400 is integrated into the motor controller in the inner stator 120, and through a unified control architecture, the system design is simplified and the control efficiency is improved, the development and maintenance costs are reduced, and the maintainability of the thrust assembly is improved. Of course, it is also convenient to configure the two redundantly, thereby improving safety. In addition, the control module of the linear drive assembly 400 is arranged in the inner stator, which has a high degree of integration in a limited installation space, and the cooling assembly of the electric engine can also be used to obtain a better cooling effect.

[0099] It is understandable that the fixed end can be completely disposed in the hub 200, and then additional parts are disposed in the through hole 111 to fix the fixed end to the inner stator 120. Alternatively, in one embodiment, a partial structure of the fixed end, that is, the connecting portion passes through the through hole 111 and is fixedly connected to the inner stator 120. In this case, part of the fixed end is located in the hub 200, and the other part extends into the through hole 111, thereby being fixedly connected to the inner stator 120.

[0100] It is not difficult to see that in this embodiment, the size of the connection structure between the fixed end and the inner stator 120 can be reduced, thereby reducing the overall weight of the thrust assembly. Moreover, the fixed end portion extends into the through hole 111, and more space can be left in the hub 200 for installing other components such as sensors.

[0101] It is understandable that the linear drive assembly 400 includes but is not limited to an electric push rod, a linear motor, a cylinder, a hydraulic cylinder, etc. Alternatively, in one embodiment, the linear drive assembly 400 includes a variable pitch motor 410, a lead screw 420, a moving part 430, and a telescopic part 440. Among them, the body of the variable pitch motor 410 is arranged in the hub 200, the variable pitch motor 410 is configured as a fixed end, and the variable pitch motor 410 has a connecting portion; the lead screw 420 extends along the axial direction of the hub 200, one end of the lead screw 420 is connected to the output shaft of the variable pitch motor 410 in the hub 200, and the other end of the lead screw 420 extends to the outside of the hub 200 in a direction away from the electric motor 100; the moving part 430 is threadedly connected to the part of the lead screw 420 extending to the outside of the hub 200 to form an output end. One end of the telescopic member 440 is connected to the body of the variable pitch motor 410 , and the other end of the telescopic member 440 is connected to the moving member 430 . The telescopic member 440 is suitable for telescoping along the axial direction of the hub 200 .

[0102] Specifically, see Figure 1 and Figure 3 The moving part 430 is threadedly connected with the part of the lead screw 420 extending outside the hub 200 to form a lead screw nut structure, so that the linear drive assembly 400 in this embodiment is a combination of a motor and a lead screw nut structure, and the lead screw nut structure is used to convert the rotational motion of the output shaft of the motor into a linear motion, thereby driving the moving part 430 to move along the axial direction of the hub 200 to move away from or close to the hub 200. It can be understood that the lead screw nut structure has a compact structure, stable transmission and high positioning accuracy, so it is suitable for the use scenario of the propeller. Among them, the moving part 430 can be configured as a lead screw nut.

[0103] Alternatively, in some embodiments, the variable pitch motor 410 includes a first winding and a second winding, and the control module is connected to the first winding and the second winding respectively through a connecting cable. In this way, the variable pitch motor forms a dual winding structure, thereby forming a dual redundancy configuration to improve safety. At this time, since the dual winding design increases the volume of the variable pitch motor and the space in the hub is limited, in order to arrange the control module corresponding to the variable pitch motor, the control module can be arranged in the inner stator 120.

[0104] Of course, in order to make the lead screw nut structure run smoothly, the thrust assembly also needs to add a bracket in the lead screw nut structure, that is, the moving member moves back and forth along the axial direction of the lead screw on the bracket and limits the moving member 430 to follow the rotation of the lead screw 420 through the bracket. Since the variable pitch push plate 300 will rotate with the hub 200, in this embodiment, the bracket is adaptively set to a telescopic member 440. One end of the telescopic member 440 extends into the hub 200 and is connected to the body of the variable pitch motor 410, and the other end is connected to the moving member 430. Since the telescopic member 440 is constructed to be telescopic along the axial direction of the hub 200, the moving member 430 will only reciprocate along the axial direction of the hub 200.

[0105] It is understandable that the number of telescopic members 440 can be set to one or more. Of course, since the variable pitch push plate 300 is subjected to the variable pitch load of each blade, it has a tendency to overturn and deflect, that is, the moving member 430 also has a tendency to overturn and deflect, so the telescopic members 440 preferably include multiple, and the multiple telescopic members 440 are evenly arranged along the circumferential direction of the moving member 430, so that the overturning tendency and deflection tendency of the moving member 430 can be better resisted, ensuring that the moving member 430 moves linearly smoothly in the axial direction of the hub 200.

[0106] It is not difficult to see that the telescopic member 440 can make the screw nut structure applicable to the scenario where the propeller rotates at high speed around the rotor axis. And it can make full use of the space in the hub vacated after the variable pitch push plate is placed on top, thereby improving the space utilization rate of the propeller. And when there are multiple telescopic members 440, the weight distribution of the thrust assembly can also be uniform.

[0107] It is worth mentioning that the telescopic member 440 includes but is not limited to linear telescopic members such as telescopic cylinders, and hinge structures such as hinges or two-link rods. Figure 1 The telescopic member 440 is constructed as a two-link hinge structure, and the hinge axes of the two links are perpendicular to the axial direction of the hub 200, so that the length of the two links in the axial direction of the hub 200 changes with the change of the angle between the two links.

[0108] In one embodiment, the outer peripheral surface of one end of the moving member 430 close to the hub 200 has a radial protrusion 432, and the pitch change bearing 800 is arranged on the side of the radial protrusion 432 away from the hub 200; the thrust assembly also includes an end cover 900, and the end cover 900 is arranged on the side of the pitch change bearing 800 away from the radial protrusion 432; the pitch change push plate 300 is sleeved on the radial outer side of the pitch change bearing 800, and the end cover 900 is fixedly connected to the pitch change push plate 300.

[0109] Specifically, see Figure 3 After the moving member 430 is installed on the lead screw 420, the outer circumferential surface of the moving member 430 includes two parts in the axial direction of the hub 200: a radial protrusion 432 and an equal diameter portion 431. Among them, the radial protrusion 432 is close to the hub 200, and the equal diameter portion 431 is far away from the hub 200. And the outer contour of the equal diameter portion 431 is circular, so that the variable pitch bearing 800 is sleeved on the equal diameter portion 431. At least part of the radial protrusion 432 protrudes from the equal diameter portion 431 in the radial direction of the moving member 430, thereby constraining and supporting the variable pitch bearing 800 in the axial direction of the hub 200. In one example, the radial protrusion 432 is configured as an annular protrusion to uniformly constrain and support the variable pitch bearing 800.

[0110] The other side of the pitch-changing bearing 800 is constrained by the end cover 900. The embedded portion 910 of the end cover 900 extends into the pitch-changing push plate 300 and stops at the end surface of the pitch-changing bearing 800 that is away from the radial protrusion 432. In addition, the end cover outer edge 920 of the end cover 900 is attached to the end surface of the pitch-changing push plate 300 that is away from the hub 200 and is fixedly connected to the pitch-changing push plate 300 by fasteners such as bolts, so as to move with the pitch-changing push plate 300.

[0111] Alternatively, the end cover 900 may also be fixed to the equal-diameter portion 431 of the moving member 430 by means of a locking nut or other structure, and move along with the moving member 430 , which is not limited in this embodiment.

[0112] Of course, for the propeller, the thrust assembly also includes at least two blades 600 and at least two pitch-changing transmission assemblies 500. The blades 600 are rotatably connected to the peripheral wall of the hub 200 around the pitch-changing axis of the blades 600, and at least two blades 600 are evenly spaced along the circumferential direction of the hub 200; at least two pitch-changing transmission assemblies 500 correspond one-to-one to at least two blades 600, and the pitch-changing transmission assemblies 500 are respectively connected to the pitch-changing push plates 300 and the blades 600, so that the pitch-changing push plates 300 drive the blades 600 to swing through the pitch-changing transmission assemblies 500.

[0113] The blade 600 is not completely fixed in the hub 200, but is rotatably connected to the outer peripheral wall of the hub 200, that is, one end of the blade 600 is inserted into the hub 200 and can rotate around its own pitch axis to change the angle of attack of the blade 600. The pitch transmission assembly 500 is used to convert the linear movement of the pitch push plate 300 into the rotational movement of the blade 600, so that when the pitch push plate 300 moves back and forth, the blade 600 is driven to swing.

[0114] The variable pitch transmission assembly 500 can be arranged in the hub 200, that is, one end of the variable pitch transmission assembly 500 is connected to one end of the blade extending into the hub 200, and the other end of the variable pitch transmission assembly 500 extends to the outside of the hub 200 in a direction away from the electric motor 100 until it is connected to the variable pitch push plate 300.

[0115] Alternatively, in another embodiment, the blade includes: a propeller handle 610 and a propeller blade 620, the propeller handle 610 is rotatably disposed on the hub 200, and one end of the propeller handle 610 extends radially to the outside of the hub 200; the propeller blade 620 is fixedly connected to one end of the propeller handle 610, and the propeller blade 620 is spaced apart from the outer peripheral wall of the hub 200 so that a portion of the propeller handle 610 is exposed; wherein the variable pitch transmission assembly 500 is located radially outside the hub 200, and one end of the variable pitch transmission assembly 500 is connected to the exposed portion of the propeller handle 610.

[0116] Specifically, see Figure 1 The propeller handle 610 is a shaft-shaped member, which includes a hidden section and an exposed section. The hidden section is inserted into the propeller hub 200 and rotates around its own central axis (i.e., the pitch change axis of the propeller blade), and the exposed section extends to the radial outer side of the propeller hub 200 to be exposed. The propeller blade 620 is fixedly mounted on the exposed section and is spaced from the outer peripheral wall of the propeller hub 200, so that at least part of the exposed section is still exposed. The pitch change transmission assembly 500 is located radially outside the propeller hub 200, one end of which is connected to the pitch change push plate 300, and the other end is connected to the exposed part of the exposed section.

[0117] It is not difficult to see that compared with the variable pitch transmission assembly 500 being installed inside the hub 200, the variable pitch transmission assembly 500 is arranged outside the hub 200, so that the variable pitch transmission assembly 500 is not limited by the internal size of the hub 200, thereby obtaining higher structural strength through a larger size.

[0118] In addition, after the variable pitch push disk 300 is placed on top, due to factors such as the complexity of the flight environment and manufacturing errors, different blades 600 will generate overturning moments of different sizes on the variable pitch push disk 300, resulting in the variable pitch push disk 300 being difficult to maintain plane stability during the rotation of the variable pitch push disk 300, and it may tilt toward the side of some blades, thereby affecting the pitch consistency of the blades 600. Therefore, in one embodiment, the thrust assembly further includes: at least two stabilizing assemblies 700, the stabilizing assemblies 700 are suitable for axial expansion and contraction along the hub 200, one end of the stabilizing assemblies 700 is hinged to the outer edge of the variable pitch push disk 300, and the other end of the stabilizing assemblies 700 is hinged to the hub 200, and at least two stabilizing assemblies 700 are evenly spaced along the circumferential direction of the variable pitch push disk 300.

[0119] Specifically, see Figure 1 and Figure 4 , the stabilizing assembly 700 relies on its own structural characteristics, and its size in the axial direction of the hub 200 is adjustable, so that it can adapt to the reciprocating movement of the variable pitch push plate 300 in the axial direction of the hub 200. In addition, the stabilizing assembly 700 relies on the structural characteristics of the stabilizing assembly 700 itself to provide a stabilizing force in the radial direction of the variable pitch push plate 300, thereby also providing a stabilizing torque to the variable pitch push plate 300. At least three stabilizing assemblies 700 are evenly arranged along the circumferential direction of the variable pitch push plate 300, so that when the variable pitch push plate 300 overturns to one side, at least part of the stabilizing assemblies 700 can rely on the structural rigidity of the stabilizing assembly 700 itself to provide a stabilizing force in the radial direction of the variable pitch push plate 300, so as to resist the overturning deformation of the variable pitch push plate 300 and ensure the plane stability of the variable pitch push plate 300 during the rotation process.

[0120] It can be understood that since the blades include at least two, that is, the overturning moment applied to the variable pitch push plate 300 includes at least two, the number of the stabilizing components 700 includes at least two, so as to resist the overturning deformation of the variable pitch push plate 300 and ensure the plane stability of the variable pitch push plate 300 during the rotation process. Of course, since three points determine a plane, the number of the stabilizing components 700 preferably includes at least three, and the three stabilizing components 700 cooperate with each other to ensure the plane stability of the variable pitch push plate 300 during the rotation process. Of course, since the number of blades of some propellers is greater than three, in order to further improve the plane stability of the variable pitch push plate 300, the number of the stabilizing components 700 should be as large as possible. For example, in order to balance the overturning moments of different sizes between different blades 600 as much as possible, in one embodiment, the number of the stabilizing components 700 is consistent with the number of blades 600 and corresponds to each other one by one. That is, the number of the stabilizing components 700 is consistent with the number of blades 600, and each blade has a corresponding stabilizing component 700 to balance its overturning moment.

[0121] It can be seen that a plurality of variable pitch transmission assemblies 500 and a plurality of stabilizing assemblies 700 are connected to the outer edge of the variable pitch push plate 300. Since the variable pitch push plate 300 is placed outside the hub 200, the layout of the variable pitch transmission assemblies 500 and the stabilizing assemblies 700 will affect the aerodynamic shape of the variable pitch propeller. In one embodiment, in the circumferential direction of the variable pitch push plate 300, at least three stabilizing assemblies 700 and at least two variable pitch transmission assemblies 500 are alternately arranged.

[0122] Specifically, since the variable pitch transmission assembly 500 is used to drive the blades to swing around their variable pitch axis, the variable pitch transmission assembly 500 is generally arranged eccentrically relative to the variable pitch axis of the blades. At this time, the stabilizing assembly 700 can be arranged directly opposite to the variable pitch axis of the corresponding blade 600, so that the variable pitch transmission assembly 500 and the stabilizing assembly 700 are arranged alternately with each other in the circumferential direction of the variable pitch push plate 300, that is, the variable pitch transmission assembly 500 and the stabilizing assembly 700 are arranged staggered with each other in the circumferential direction to avoid interference between the two in the radial direction of the variable pitch push plate 300, which leads to an increase in the overall size of the propeller. Of course, it is also beneficial to use a cover body with a size as small as possible to cover the variable pitch push plate 300, the variable pitch transmission assembly 500 and the stabilizing assembly 700 as a whole, so as to improve the aerodynamic shape of the variable pitch propeller.

[0123] The aforementioned stabilizing assembly 700 includes but is not limited to a linear guide rod, a telescopic cylinder, etc. Alternatively, in one embodiment, the stabilizing assembly 700 includes: a first connecting arm 710, a second connecting arm 720, and an elastic member 730. Among them, one end of the first connecting arm 710 is hinged to the variable pitch push plate 300; one end of the second connecting arm 720 is hinged to the other end of the first connecting arm 710, and the other end of the second connecting arm 720 is hinged to the hub 200, and there is an angle between the first connecting arm 710 and the second connecting arm 720; the elastic member 730 is arranged between the first connecting arm 710 and the second connecting arm 720.

[0124] Specifically, see Figure 3 and Figure 4, the first connecting arm 710 and the second connecting arm 720 are hinged to each other to form a "V"-shaped two-link structure. When the variable pitch push plate 300 is away from the hub 200, the angle between the first connecting arm 710 and the second connecting arm 720 becomes larger, and when the variable pitch push plate 300 is close to the hub 200, the angle between the first connecting arm 710 and the second connecting arm 720 becomes smaller. This V-shaped structure can fully adapt to the tensile and compressive loads of the variable pitch push plate 300 in its axial and radial directions through the swing of the first connecting arm 710 compared to the variable pitch push plate 300, the swing of the second connecting arm 720 compared to the hub 200, and the change of the angle between the first connecting arm 710 and the second connecting arm 720. In addition, when the variable pitch push plate 300 approaches or moves away from the hub 200, the angles of the multiple two-link structures of the "V"-shaped two-link structure change together, and the variable pitch push plate 300 is guided together to ensure that the variable pitch push plate 300 reciprocates along the axial direction of the hub 200. The V-shaped two-link structure forms a triangular unit, and the stability principle of the triangular unit is used to fully exert the strength of the manufacturing materials of the first connecting arm 710 and the second connecting arm 720 at each angle state.

[0125] In addition, an elastic member 730 is installed between the first connecting arm 710 and the second connecting arm 720. When the variable-pitch push plate 300 overturns and causes the angle between the first connecting arm 710 and the second connecting arm 720 to change, the elastic member 730 uses its own deformation to provide a balancing torque, thereby jointly resisting the overturning torque of the variable-pitch push plate 300 through the balancing torque provided by the elastic members 730 of all stabilizing components 700 to maintain the stability of the variable-pitch push plate 300.

[0126] In addition, by providing the elastic member 730, the stabilizing assembly 700 can also play a role in reducing vibration and load. The elastic member 730 includes but is not limited to a tension spring, a compression spring or a torsion spring. For example, in one embodiment, the elastic member 730 is a torsion spring, and the torsion spring is sleeved on the hinge shaft between the first connecting arm 710 and the second connecting arm 720. It should be noted that the torsion spring is sleeved on the hinge shaft, so compared with the tension spring and the compression spring, the torsion spring does not occupy the space outside the first connecting arm 710 and the second connecting arm 720, which is not only conducive to a simpler aerodynamic shape of the variable pitch propeller, but also avoids occupying the space in the variable pitch push plate 300 and the hub 200 to affect the reciprocating movement of the variable pitch push plate 300.

[0127] It is worth mentioning that compared with other configurations of the stabilizing assembly 700, the triangular structure is also suitable for the dynamic load scenario of bearing overturning moment. The "V"-shaped two-link structure with more than three members combined with the elastic member 730 enables the variable pitch push plate 300 to have a strong ability to resist overturning moment, thereby ensuring the pitch consistency of each blade.

[0128] In addition, in this embodiment, please refer to Figure 5 , shows the change of the spring gain of the elastic member 730 and the motor load (torque value) of the electric motor 100 with the pneumatic variable pitch load from hovering to tilting (wherein the elastic force of the elastic member 730 approximately conforms to Hooke's law, and its elastic force value changes with the length of the elastic member 730). The existence of the elastic member 730 reduces the driving load of the variable pitch motor 410 on average, and the integrated spring has a considerable power gain.

[0129] In addition, when the variable pitch propeller is subjected to unsteady variable pitch load fluctuations (such as gusts, oblique flows, etc.), the elastic member 730 will also provide a balancing torque to quickly reduce the interference, thereby improving the anti-interference ability of the variable pitch push plate 300.

[0130] It can be understood that, as an option of this embodiment, the V-shaped structure formed by the first connecting arm 710 and the second connecting arm 720 is located in the lower inner area of ​​the variable pitch push plate 300, that is, on the plane where the variable pitch push plate 300 is located, the projection of the first connecting arm 710 and the projection of the second connecting arm 720 are both located on the variable pitch push plate 300. Alternatively, as another option of this embodiment, on the plane where the variable pitch push plate 300 is located, the projection of the first connecting arm 710 and the projection of the second connecting arm 720 are both located radially outside the variable pitch push plate 300.

[0131] It is not difficult to see that compared with the V-shaped structure formed by the first connecting arm 710 and the second connecting arm 720 located in the lower inner area of ​​the variable pitch push plate 300, the V-shaped structure formed by the first connecting arm 710 and the second connecting arm 720 is located on the outer side of the variable pitch push plate 300 and will not occupy the space between the variable pitch push plate 300 and the hub 200 in the axial direction of the hub 200, thereby avoiding increasing the distance between the variable pitch push plate 300 and the hub 200 and causing the overall axial size of the variable pitch propeller to increase.

[0132] Also, see Figure 6 , the elastic member 730 will also add a preload force to the pitch-changing push plate 300. The preload force provided by the stabilizing assembly 700 in the axial direction of the hub 200 can eliminate the matching clearance between the lead screw 420 and the moving member 430, thereby improving the pitch-changing accuracy. If the preload force provided by the stabilizing assembly 700 is a thrust force, the teeth between the lead screw 420 and the moving member 430 are all meshed on the upper surface, and when the preload force provided by the elastic force is a tension force, the teeth between the lead screw 420 and the moving member 430 are all meshed on the lower surface.

[0133] It is worth mentioning that the stabilizing assembly 700 can also be constructed as an elastic damper, a shock absorber or the like, so that on the basis of achieving anti-overturning through structural rigidity, the vibration reduction and load reduction effects provided by the aforementioned elastic parts can also be achieved.

[0134] In one embodiment, the pitch change transmission assembly 500 includes a pitch change connecting rod and a pitch change pin 550, one end of the pitch change connecting rod is hinged to the pitch change push plate 300, the other end of the pitch change connecting rod is hinged to one end of the pitch change pin 550, the other end of the pitch change pin 550 is fixedly connected to the blade 600 to rotate around the pitch change axis of the blade 600, and the length of the pitch change connecting rod is adjustable.

[0135] Specifically, the pitch pin 550 extends in the radial direction of the propeller handle 610 so as to protrude from the peripheral side wall of the blade 600, so that the pitch pin 550 can swing around the pitch axis of the blade 600. It is worth mentioning that when the pitch transmission assembly 500 is located in the hub 200, the pitch pin 550 can be fixed to the end surface of the blade extending into the hub 200, and extends in the radial direction of the propeller handle 610 so as to protrude from the peripheral side wall of the blade. Alternatively, when the pitch transmission assembly 500 is located outside the hub 200, the pitch pin 550 can be fixed to the peripheral side wall of the propeller handle 610.

[0136] The pitch-changing connecting rod generally extends upward along the axis of the hub 200, and one end of the pitch-changing push plate 300 is hinged to the pitch-changing push plate 300 above the hub 200, and the other end is hinged to the pitch-changing pin 550 on the radial side of the hub 200, so that the pitch-changing push plate 300, the pitch-changing connecting rod and the pitch-changing pin 550 together constitute a crank-connecting rod structure, so that the linear movement of the pitch-changing push plate 300 can be transmitted to the pitch-changing pin 550, and then the pitch-changing pin 550 drives the blade to swing, thereby adjusting the angle of attack of the blade.

[0137] After the blade is installed on the hub 200, in order to achieve fine adjustment of the installation angle of the blade 600, it can be achieved by adjusting the length of the pitch change connecting rod or the pitch change pin 550. In this embodiment, the length of the pitch change connecting rod is adjustable, so after the blade is installed on the hub 200, in this embodiment, the blade angle of attack can be finely adjusted by adjusting the length of the pitch change connecting rod.

[0138] It is easy to understand that since the length of the pitch change link is longer than the length of the pitch change pin 550 and most of the pitch change link is exposed to the outside compared to the pitch change pin 550, it is convenient for maintenance personnel to adjust the pitch of the pitch change link, thereby achieving fine-tuning of the angle of attack.

[0139] As an option of this embodiment, the variable pitch connecting rod includes: a fixed section 510 with openings at both ends of the axial direction, a first movable section 520, a second movable section 530, and a distance adjustment structure. A receiving cavity connected to both openings is defined in the fixed section 510; a portion of the first movable section 520 extends from an opening at one end of the fixed section 510 into the receiving cavity and can move along the axial direction of the fixed section 510; a portion of the second movable section 530 extends from an opening at the other end of the fixed section 510 into the receiving cavity and can move along the axial direction of the fixed section 510; at least a portion of the distance adjustment structure 540 is disposed in the receiving cavity and is respectively connected to the first movable section 520 and the first movable section 520 to adjust the distance between the first movable section 520 and the second movable section 530; a locking member (not shown) cooperates with the fixed section 510 and the distance adjustment structure 540 respectively to lock the distance adjustment structure.

[0140] Specifically, see Figure 7 The variable pitch connecting rod is generally composed of three parts, namely, a fixed section 510, a first movable section 520 and a second movable section 530. The fixed section 510 is generally constructed as a hollow tubular structure with openings at both ends, so that a portion of the first movable section 520 extends from the opening at one axial end of the fixed section 510 into the fixed section 510, and a portion of the second movable section 530 extends from the other axial end of the fixed section 510 into the fixed section 510, and the first movable section 520 and the second movable section 530 can both move along the axial direction of the fixed section 510 in the fixed section 510, thereby changing the length of the portions of the first movable section 520 and the second movable section 530 exposed from the fixed section 510, thereby achieving that the overall length of the fixed section 510, the first movable section 520 and the second movable section 530 in the axial direction of the fixed section 510 is adjustable, that is, the length of the variable pitch connecting rod is adjustable.

[0141] It should be noted that the cross-sectional shape of the fixed section 510 can be circular, polygonal, etc., and this embodiment does not limit this. In addition, in order to prevent the first movable section 520 and the second movable section 530 from detaching from the fixed section 510 when moving, the first movable section 520 and the second movable section 530 are both variable diameter structures, and the outer diameter of the first movable section 520 or the second movable section 530 located inside the fixed section 510 is larger than the outer diameter of the first movable section 520 or the second movable section 530 located outside the fixed section 510, and the aperture of the openings at both axial ends of the fixed section 510 matches the outer diameter of the first movable section 520 or the second movable section 530 located outside the fixed section 510 and is smaller than the outer diameter of the first movable section 520 or the second movable section 530 located inside the fixed section 510. In one example, refer to Figure 8 The portion of the first movable section 520 or the second movable section 530 located inside the fixed section 510 is connected to the portion located outside the fixed section 510 via threads.

[0142] At least a portion of the distance adjustment structure 540 is disposed in the accommodating cavity and is connected to the first movable section 520 and the second movable section 530 respectively, so as to adjust the distance between the first movable section 520 and the second movable section 530 in the fixed section 510 .

[0143] The distance adjustment structure 540 may include a knob and a cam fixedly connected to each other, the cam being rotatably arranged in the accommodating cavity, and the knob being located outside the fixed section 510, and the cam being forced to rotate by rotating the knob. The first moving section 520 and the second moving section 530 are respectively located on the opposite sides of the cam, and both are against the cam surface. At this time, as the cam rotates, the first moving section 520 and the second moving section 530 slide relative to the cam on the cam surface, thereby changing the distance between the first moving section 520 and the second moving section 530.

[0144] Alternatively, in one embodiment, the distance adjustment structure 540 includes: a knob portion 541 and a matching portion 542. The knob portion 541 is rotatably disposed on the outer peripheral wall of the fixed section 510; the matching portion 542 is disposed in the accommodating cavity and fixedly connected to the knob portion 541, and a cam groove 5421 is provided on the end surface of the matching portion 542 facing away from the knob portion 541. The first movable section 520 includes a first protruding portion 524, which extends into the cam groove 5421 and slidably matches with the cam groove 5421, and the second movable section 530 includes a second protruding portion 534, which extends into the cam groove 5421 and slidably matches with the cam groove 5421.

[0145] Specifically, a mounting hole connected to the accommodating cavity is provided on the side wall of the fixed section 510, and the rotating post of the knob portion 541 extends into the mounting hole so that the knob portion 541 as a whole rotates around the central axis of the mounting hole. The matching portion 542 is located in the accommodating cavity, and the end surface of the matching portion 542 facing the knob portion 541 is fixedly connected to the rotating post of the knob portion 541, so that when the knob portion 541 is rotated, the matching portion 542 can be forced to rotate around the central axis of the mounting hole. A cam groove 5421 is provided on the end surface of the matching portion 542 away from the knob portion 541. On the end surface of the matching portion 542 away from the knob portion 541, the cam groove 5421 has a farthest point farthest from the central axis of the mounting hole and a closest point closest to the central axis of the mounting hole.

[0146] The first movable section 520 has a first protrusion 524 that extends into the cam groove 5421 and slides in the cam groove 5421. Similarly, the second movable section 530 has a second protrusion 534 that extends into the cam groove 5421 and slides in the cam groove 5421. It should be noted that the first movable section 520, the matching portion 542 and the second movable section 530 can be arranged in sequence in the axial direction of the fixed section 510, so that the first protrusion 524 can protrude from the first movable section 520 in the axial direction of the fixed section 510, and bend and extend in a direction close to the matching portion 542, so as to extend into the cam groove 5421, and the second protrusion 534 can protrude from the second movable section 530 in the axial direction of the fixed section 510, and bend and extend in a direction close to the matching portion 542, so as to extend into the cam groove 5421. Alternatively, please refer to Fig. 9 The first movable section 520 and the second movable section 530 can be spaced apart from each other in the axial direction of the fixed section 510, and the matching portion 542 is located on the side of the first movable section 520 and the second movable section 530, and a portion of the surface of the side wall of the first movable section 520 close to the matching portion 542 protrudes into the cam groove 5421 to form a first protrusion 524, and a portion of the surface of the side wall of the second movable section close to the matching portion 542 protrudes into the cam groove 5421 to form a second protrusion 534.

[0147] Therefore, when the maintenance personnel rotates the matching part 542 through the knob part 541, the cam groove 5421 on the end face of the matching part 542 is also forced to rotate. Since the first movable section 520 and the second movable section 530 are constrained by the fixed section 510, the first protrusion 524 and the second protrusion 534 can only move axially along the fixed section 510. Therefore, when the first protrusion 524 and the second protrusion 534 slide in the cam groove 5421, the rotation of the cam groove 5421 will force the first protrusion 524 and the second protrusion 534 to approach or move away from each other, thereby finally achieving the adjustment of the blade installation angle.

[0148] Alternatively, in another embodiment, the mating portion 542 of the distance adjustment structure 540 is constructed as an external gear, the first moving section 520 has a first rack portion, the second moving section 530 has a second rack portion, and the first rack portion and the second rack portion are respectively meshed with the mating portion 542 on opposite sides of the external gear.

[0149] Therefore, when the maintenance personnel rotates the matching part 542 through the knob part 541, since the first movable section 520 and the second movable section 530 are constrained by the fixed section 510, the first rack section and the second rack section can only move axially along the fixed section 510. In addition, the first rack section and the second rack section are located on opposite sides of the matching part 542. The rotation of the matching part 542 will force the first movable section 520 and the second movable section 530 to move closer to or away from each other, thereby finally achieving the adjustment of the blade installation angle.

[0150] Of course, the distance adjustment structure 540 is not limited to the above-mentioned implementation manner, and can still be implemented by a rotational motion to linear motion method such as a thread pair.

[0151] The locking member in this embodiment can be configured as a locking pin or other structure, which has a locking state. After the blade installation angle is adjusted, the locking member switches to the locking state to lock knob portion 541 to prevent knob portion 541 from rotating, thereby maintaining the current blade installation angle. Of course, the locking member can also be configured as other structures that can lock the knob and prevent the knob from rotating, and this embodiment does not limit this.

[0152] Alternatively, as another option of this embodiment, the variable pitch transmission assembly 500 further includes: a rotating member 560, a connecting rod body 580 and a locking member 570, wherein the rotating member 560 is rotatably connected to the peripheral side wall of the variable pitch push plate 300, and the rotation axis of the rotating member 560 extends along the radial direction of the variable pitch push plate 300. One end of the connecting rod body 580 is rotatably connected to the side wall of the rotating member 560 away from the variable pitch push plate 300, the rotation axis between one end of the connecting rod body 580 and the rotating member 560 is parallel to and spaced from the rotation axis of the rotating member 560, and the other end of the connecting rod body 580 is hinged to one end of the variable pitch pin 550. The locking member 570 cooperates with the rotating member and the variable pitch push plate 300 respectively to lock the rotating member and the variable pitch push plate 300.

[0153] Specifically, see Fig.10 The rotating member 560 can be constructed in a cylindrical shape. In the direction from the radial inside to the radial outside of the variable pitch push plate 300, the rotating member 560 and the connecting rod body 580 are arranged in sequence, and the rotating member 560 rotates relative to the variable pitch push plate 300 around its central axis (parallel to the radial direction of the variable pitch push plate 300). One end of the connecting rod body 580 is rotatably connected to the end surface of the rotating member 560 that is away from the variable pitch push plate 300, and the rotation axis between one end of the connecting rod body 580 and the rotating member 560 is parallel to and spaced from the rotation axis of the rotating member 560, so that the connecting rod body 580 is eccentrically arranged compared to the rotating member 560. Therefore, as the rotating member 560 rotates, the distance between one end of the connecting rod body 580 and the plane where the variable pitch push plate 300 is located also changes, that is, the distance between the hinge axis between the variable pitch pin 550 and the other end of the connecting rod body 580 and the plane where the variable pitch push plate 300 is located changes. When this distance changes, the variable pitch pin 550 drives the blade to be forced to swing, thereby changing the installation angle of the blade.

[0154] In addition, the locking member 570 is used to lock the rotatable rotating member 560 to prevent it from rotating relative to the variable pitch push plate 300. Specifically, the circumferential side wall of the rotating member 560 is configured with threads, and the locking member 570 can be configured as a screw. In the axial direction of the screw, the screw has a threaded portion and a smooth portion, and the threaded portion and the rotating member 560 form a "worm gear" matching relationship. In this way, the self-locking property of the "worm gear" is used to lock the rotating member 560 to prevent it from rotating relative to the variable pitch push plate 300.

[0155] Of course, the locking member 570 can also be constructed as other structures that can lock the rotating member 560, a component that rotates around its own rotation axis, such as a locking pin, etc., which will not be described in detail here.

[0156] It is not difficult to see that the blade installation angle can be adjusted at the pitch-changing connecting rod. Since the pitch-changing connecting rod is long and generally exposed to the outside, it is convenient for maintenance personnel to operate. In addition, the blade installation angle can also be adjusted at the pitch-changing push plate. In this embodiment, since the pitch-changing push plate 300 is placed on top, there is no need for maintenance personnel to disassemble and assemble the pitch-changing propeller, and there is enough space for maintenance personnel to operate, which improves maintenance efficiency and convenience.

[0157] In addition, in the actual flight process, the blade load may be inconsistent, which may cause the actual flight direction to deviate. Therefore, in one embodiment, the first moving section 520 further includes a first rod 521, a first elastic layer 523, and a second rod 522 connected in sequence along the axial direction of the fixed section 510, and the first rod 521 and / or the second rod 522 move in the fixed section 510 along the axial direction of the fixed section 510.

[0158] Specifically, see Fig. 9 , the first movable section 520 includes three parts connected in sequence in the axial direction of the fixed section 510, wherein the first rod body 521 is connected to the variable pitch push plate 300, at least part of the second rod body 522 extends into the fixed section 510 to slide with the fixed section 510, and the first rod body 521 and the second rod body 522 are connected through the first elastic layer 523. It should be noted that the first elastic layer 523 can be arranged in the fixed section 510, in which case part of the first rod body 521 extends into the fixed section 510, and the second rod body 522 is entirely located in the fixed section 510; or the first elastic layer 523 can be located outside the fixed section 510, in which case the first rod body 521 is located outside the fixed section 510, and part of the second rod body 522 extends into the fixed section 510.

[0159] Alternatively, the second movable section 530 includes three parts connected in sequence in the axial direction of the fixed section 510: a third rod 532, a second elastic layer 533 and a fourth rod 531, wherein at least a portion of the third rod 532 extends into the fixed section 510 to slide with the fixed section 510, the fourth rod 531 is connected to the variable pitch pin 550, and the third rod 532 and the fourth rod 531 are connected through the second elastic layer 533. Similarly, the second elastic layer 533 can be arranged in the fixed section 510, in which case a portion of the fourth rod 531 extends into the fixed section 510, and the third rod 532 is entirely located in the fixed section 510; or the second elastic layer 533 can be located outside the fixed section 510, in which case the fourth rod 531 is located outside the fixed section 510, and a portion of the third rod 532 extends into the fixed section 510.

[0160] Of course, the first elastic layer 523 and the second elastic layer 533 may be provided at the same time, which will not be described in detail here.

[0161] In this way, when the tiltrotor aircraft undergoes a transitional mode conversion resulting in inconsistent load on the blades, the load is transferred to the pitch-changing link, and the first elastic layer 523 and / or the second elastic layer 533 can be elastically deformed to enable the blade pitch angle to start changing in the direction of aerodynamic unloading, thereby achieving adaptive adjustment of the pitch angle and improving the uneven load condition of the hub 200 and the pitch-changing push plate 300.

[0162] It is worth mentioning that the materials of the first elastic layer 523 and the second elastic layer 533 include but are not limited to rubber, elastomeric plastics, etc.

[0163] Also, see Fig. 9 , the second rod 522 may have the aforementioned first protrusion 524, and the third rod 532 may have the aforementioned second protrusion 534. In a specific embodiment, both the first protrusion 524 and the second protrusion 534 are connected to the body (the first rod 521 or the fourth rod 531) of the first moving section 520 or the second moving section 530 through an elastic material (the first elastic layer or the second elastic layer).

[0164] As before, in this embodiment, after the variable pitch push plate 300 is placed on top to leave space in the hub 200, in one embodiment, the variable pitch propeller further includes at least two angle sensors, the at least two angle sensors correspond to at least two blades one by one, and the angle sensors are arranged at the portion where the blades extend into the hub 200. In this way, angle sensors equal to the number of blades can be added in the hub 200, so that the angle of attack of each blade can be directly collected through the angle sensors, thereby improving the accuracy of angle measurement.

[0165] See also Figure 2In one embodiment, the electric engine 100 further includes: a rear cover 130, a cooling assembly 140, and an eccentric shaft 150. The rear cover 130 is disposed on a side of the inner stator 120 away from the hub 200; the cooling assembly 140 is disposed on a side of the rear cover 130 away from the inner stator 120; the eccentric shaft 150 is rotatably disposed in the central axis hole of the inner stator 120 around its own central axis, the central axis of the eccentric shaft 150 is parallel to the central axis of the central axis hole and spaced apart from each other, and one end of the eccentric shaft 150 is transmission-connected to the cooling assembly 140, and the other end of the eccentric shaft 150 is transmission-connected to the outer rotor 110, so that the outer rotor 110 drives the cooling assembly 140 through the eccentric shaft.

[0166] The cooling component 140 may include an air cooling component (such as a cooling fan), a liquid cooling component (such as a heat exchanger and a pumping component that pumps coolant into the motor so that the coolant flows through the inside of the motor) or a combination of an air cooling component and a liquid cooling component.

[0167] Since the central shaft hole inside the inner stator 120 is connected to the axial ends of the inner stator 120, and the outer rotor 110 and the cooling assembly 140 are respectively located at the axial ends of the inner stator 120, in this embodiment, part of the eccentric shaft 150 is arranged in the central shaft hole, and one end extends to the mechanical connection end to be transmission-connected with the outer rotor 110, and the other end extends to the cooling assembly 140 to be transmission-connected with the cooling assembly 140, thereby transmitting the rotational motion of the outer rotor 110 to the cooling assembly 140 to drive the air cooling assembly and / or liquid cooling assembly of the cooling assembly 140 to start operation.

[0168] It is not difficult to see that in this embodiment, an eccentrically arranged eccentric shaft 150 is added to the existing space in the inner stator 120 of the outer rotor 110 motor, that is, the central axis hole in the inner stator 120 that penetrates the inner stator 120 along the axial direction of the inner stator 120. The eccentric shaft 150 drives the outer rotor 110 to the cooling component 140 that takes away the heat generated when the motor is running, so that the cooling component 140 is driven by the outer rotor 110 in the motor assembly, eliminating the independent electric drive component and the required circuit wiring structure, thereby optimizing the overall weight of the motor assembly. In addition, the outer rotor 110 drives the cooling component 140 through the eccentric shaft of the mechanical transmission structure, which is more reliable and safer than the independent electric drive component.

[0169] In addition, most of the eccentric shaft in this embodiment is arranged in the central shaft hole in the inner stator 120, and the existing structure and layout of the motor and cooling component 140 in the motor assembly are not changed, which is conducive to promotion and use in existing products.

[0170] In addition, this embodiment eliminates the independent electric drive assembly required for the cooling assembly 140, and can also avoid the heat dissipation problem and heat dissipation risk of the independent drive motor.

[0171] In addition, since the eccentric shaft 150 rotates around its own central axis, and the central axis of the eccentric shaft 150 is staggered with the central axis of the rotating shaft 112, a corresponding transmission structure is also required to connect the rotating shaft 112 and the eccentric shaft 150 to transmit the rotational motion of the rotating shaft 112 to the eccentric shaft 150. It can be understood that the eccentric shaft 150 and the rotating shaft 112 belong to the transmission between different axes, so it can be realized by using a gear set or a transmission belt and other structures. However, structures such as transmission belts may occupy the space in the rotating shaft hole, thereby affecting the layout of the connecting cables. Therefore, in one embodiment, the electric engine also includes an inner ring gear 161 and a matching gear 162, the inner ring gear 161 is fixedly connected to the end face of the rotating shaft 112 of the outer rotor close to the inner stator 120, and the central axis of the inner ring gear 161 is colinear with the central axis of the outer rotor 110; the matching gear 162 is fixedly sleeved on the other end of the eccentric shaft 150, and the matching gear 162 is meshed with the inner ring gear 161.

[0172] Specifically, see Figure 2 , Fig.11 and Fig.12 The inner gear ring 161 is fixed to the end face of the rotating shaft 112 close to the inner stator 120 by means of screws or other fasteners or welding, and the central axis of the inner gear ring 161 is colinear with the central axis of the rotating shaft 112. The matching gear 162 is meshed with the inner gear ring 161 inside the inner gear ring 161, and the matching gear 162 is fixedly sleeved on the end of the eccentric shaft 150 close to the rotating shaft 112. Therefore, when the rotating shaft 112 rotates, it drives the inner gear ring 161 to rotate, and the rotation of the inner gear ring 161 will drive the matching gear 162 to rotate around the central axis of the eccentric shaft 150, that is, drive the eccentric shaft 150 to rotate around its own central axis.

[0173] It is not difficult to see that in this embodiment, since the inner gear ring 161 is an annular member and its interior is hollow, the inner gear ring 161 does not occupy the front and rear space in the axial direction of the shaft hole, thereby leaving enough space for cable routing. In this way, the connecting cable can pass through the inner gear ring 161 and the through hole 111 in sequence and extend to the outside of the motor assembly.

[0174] It is worth mentioning that in order to further prevent the inner gear ring 161 from affecting the cable routing, the inner diameter of the inner gear ring 161 can be larger than the inner diameter of the rotating shaft 112, that is, the inner edge of the projection of the inner gear ring 161 on the plane where the end face of the rotating shaft 112 is located is located radially outside the inner edge of the rotating shaft 112.

[0175] It is understandable that when the motor is running, the mating gear 162 will rotate at a high speed, and if the cable touches the mating gear 162, the cable will be damaged. Therefore, in one embodiment, the thrust assembly further includes: a support cover, the support cover is disposed in the through hole 111 and is fixedly connected to the inner stator 120, a portion of the surface of one side end surface of the support cover protrudes to form a protrusion, and the protrusion is provided with a wiring hole 173 that penetrates the support cover along the axial direction of the inner stator 120; wherein the protrusion is located radially outside the mating gear 162 and is spaced apart from each other.

[0176] Specifically, the support cover is located in the rotating shaft hole but is not fixedly connected to the rotating shaft 112, but is fixedly connected to the inner stator 120, and an eccentric shaft bearing is installed on the support cover, and the eccentric shaft bearing cooperates with the eccentric shaft 150 to allow the eccentric shaft 150 to rotate relative to the support cover. Part of the surface of one side end face of the support cover protrudes outward from the radial outside of the mating gear 162 to form a protrusion, and a wiring hole 173 for the cable to pass through is formed in the protrusion. The wiring hole 173 provides an independent wiring space. In this way, when the connecting cable passes near the mating gear 162, it is constrained and protected by the hole wall of the wiring hole 173, thereby preventing the connecting cable from being damaged by the mating gear 162 rotating at high speed.

[0177] See also Fig.11 and Fig.12The support cover includes a support upper cover 172 and a support lower cover 171. The support lower cover 171 is fixed to the end face of one side of the inner stator 120 close to the rotating shaft 112. A portion of the surface of the end face of one side of the support lower cover 171 close to the rotating shaft 112 protrudes in a direction away from the inner stator 120 to form a lower protrusion 1711. The support upper cover 172 is located inside the rotating shaft 112 and is not connected to the rotating shaft 112. A portion of the surface of the end face of one side of the support upper cover 172 close to the inner stator 120 protrudes and extends in a direction close to the inner stator 120 to form an upper protrusion 1721. The upper protrusion 1721 stops at the lower protrusion 1711 and is fixedly connected to each other to form a protrusion. At this time, the support upper cover 172 and the support lower cover 171 define an accommodation space, and the matching gear 162 and the eccentric shaft bearing are both located in the accommodation space. It is not difficult to see that in this embodiment, the axial ends of the matching gear 162 are covered by the support upper cover 172 and the support lower cover 171 respectively, so as to further prevent foreign matter from entering the electric motor from the rotating shaft hole, or prevent the electronic components in the inner stator 120 from falling and moving to the matching gear 162 to affect the meshing of the matching gear 162 and the inner gear ring 161, thereby improving the matching reliability of the matching gear 162 and the inner gear ring 161. In addition, when the connecting cable is laid, there is always a margin in the length, that is, the connecting cable is not a straight line in the motor assembly, but a curved shape. Therefore, the axial ends of the matching gear 162 are covered by the support upper cover 172 and the support lower cover 171 respectively, so that the cable in the wiring hole 173 is protected by the hole wall of the wiring hole 173, and the cable near the wiring hole 173 is protected by the support upper cover 172 and the support lower cover 171, which jointly prevents the cable from being damaged by the high-speed rotating matching gear 162.

[0178] The cross-sectional shape of the wiring hole 173 can be a circular shape or the like. Of course, since the mating gear 162 has already occupied a portion of the space defined by the shaft hole, in order to allow the wiring hole 173 to occupy more space in the remaining space to arrange more cables, in one embodiment, refer to Figure 4 The cross section of the wiring hole 173 is arc-shaped and partially surrounds the matching gear 162 .

[0179] In addition, the present invention also provides an aircraft, which includes an aircraft body; and at least one thrust assembly as described above, wherein the thrust assembly is arranged on the aircraft body.

[0180] The specific structure of the thrust assembly refers to the above-mentioned embodiments. Since the aircraft adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0181] The aircraft may be a drone or an electric vertical take-off and landing aircraft eVTOL.

[0182] The above are only exemplary embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A thrust assembly, characterized in that: include: an electric motor, the electric motor comprising an outer rotor; A propeller hub, wherein the propeller hub is fixedly connected to the outer rotor; A variable pitch push plate, the variable pitch push plate being located on a side of the hub facing away from the electric engine; At least two blades, the blades are rotatably connected to the peripheral wall of the hub around a pitch axis of the blades, and at least two blades are spaced apart along the circumferential direction of the hub; as well as At least two variable pitch transmission assemblies, at least two of the variable pitch transmission assemblies correspond one-to-one to at least two of the blades, the variable pitch transmission assemblies are respectively connected to the variable pitch push plate and the blade, so that the variable pitch push plate drives the blade to swing through the variable pitch transmission assembly, the variable pitch transmission assembly includes a variable pitch pin, the other end of the variable pitch pin is fixedly connected to the blade to rotate around the variable pitch axis of the blade, and the distance between one end of the variable pitch pin and the plane where the variable pitch push plate is located is adjustable to achieve fine adjustment of the blade angle of attack.

2. The thrust assembly according to claim 1, characterized in that The variable pitch transmission assembly also includes a variable pitch connecting rod, one end of which is hinged to the variable pitch push plate, the other end of which is hinged to one end of the variable pitch pin, and the length of the variable pitch connecting rod is adjustable.

3. The thrust assembly according to claim 2, characterized in that The variable pitch connecting rod comprises: A fixed section with openings at both axial ends, wherein a receiving cavity communicating with both openings is defined in the fixed section; A first movable section, a portion of which extends from an opening at one end of the fixed section into the accommodating cavity and is movable along the axial direction of the fixed section; A second movable section, a portion of which extends from the other end opening of the fixed section into the accommodating cavity and is movable along the axial direction of the fixed section; a distance adjustment structure, wherein a portion of the distance adjustment structure is disposed in the accommodating cavity and is respectively connected to the first moving segment and the second moving segment to adjust the distance between the first moving segment and the second moving segment; A locking member, wherein the locking member cooperates with the fixing section and the distance adjusting structure respectively to lock the distance adjusting structure.

4. The thrust assembly according to claim 3, characterized in that The distance adjustment structure comprises: A knob portion, the knob portion being rotatably disposed on the outer peripheral wall of the fixed section; A matching portion, the matching portion is arranged in the accommodating cavity and is fixedly connected to the knob portion, and a cam groove is formed on a side section of the matching portion away from the knob portion; Wherein, the first moving section includes a first protrusion, which extends into the cam groove and slidably cooperates with the cam groove, and the second moving section includes a second protrusion, which extends into the cam groove and slidably cooperates with the cam groove.

5. The thrust assembly according to claim 3, characterized in that: The first moving section further comprises a first rod body, a first elastic layer and a second rod body sequentially connected along the axial direction of the fixed section, and the first rod body and / or the second rod body moves in the fixed section along the axial direction of the fixed section; and / or The second moving section further comprises a third rod, a second elastic layer and a fourth rod which are sequentially connected along the axial direction of the fixed section. The third rod and / or the fourth rod moves in the fixed section along the axial direction of the fixed section.

6. The thrust assembly according to claim 1, wherein: The variable pitch transmission assembly also includes: A rotating member, the rotating member is rotatably connected to the peripheral side wall of the variable pitch push plate, and the rotating axis of the rotating member extends along the radial direction of the variable pitch push plate; A connecting rod body, one end of which is rotatably connected to a side wall of the rotating member that is away from the variable pitch push plate, and is eccentrically arranged relative to the rotating member; A locking member is used to lock the rotating member to prevent the rotating member from rotating relative to the variable pitch push plate.

7. The thrust assembly according to any one of claims 1 to 6, characterized in that: The thrust assembly further comprises: At least two stabilizing components are suitable for axial extension and retraction along the hub, one end of the stabilizing component is hinged to the variable pitch push plate, the other end of the stabilizing component is hinged to the hub, and at least two of the stabilizing components are spaced apart along the circumferential direction of the variable pitch push plate.

8. The thrust assembly according to claim 7, characterized in that One end of the stabilizing assembly is hinged to the outer edge of the variable pitch push plate; and / or At least two of the stabilizing assemblies are evenly spaced along the circumferential direction of the variable pitch push plate; and / or The number of the stabilizing components is consistent with the number of the blades and corresponds to each other one by one.

9. The thrust assembly according to claim 7, characterized in that: The stabilizing assembly comprises: A first connecting arm, one end of which is hinged to the outer edge of the variable pitch push plate; and A second connecting arm, one end of the second connecting arm is hinged to the other end of the first connecting arm, the other end of the second connecting arm is hinged to the hub, and an angle is formed between the first connecting arm and the second connecting arm.

10. The thrust assembly according to claim 9, characterized in that The stabilizing assembly further includes an elastic member disposed between the first connecting arm and the second connecting arm.

11. An aircraft, characterized in that: The aircraft comprises: Aircraft airframe; and At least one thrust assembly according to any one of claims 1 to 10, wherein the thrust assembly is arranged on the aircraft body, wherein the aircraft is an electric vertical take-off and landing aircraft.

Images