CN119218413B

CN119218413B - Pitch-variable propeller, thrust assembly and aircraft

Info

Publication number: CN119218413B
Application number: CN202411776000.0A
Authority: CN
Inventors: 郭亮; 李清; 王武先; 李航
Original assignee: Sichuan Wofei Changkong Technology Development Co ltd; Zhejiang Geely Holding Group Co Ltd
Current assignee: Sichuan Wofei Changkong Technology Development Co ltd; Zhejiang Geely Holding Group Co Ltd
Priority date: 2024-12-05
Filing date: 2024-12-05
Publication date: 2025-03-04
Anticipated expiration: 2044-12-05
Also published as: CN119218413A

Abstract

The present invention discloses a variable pitch propeller, a thrust assembly and an aircraft, and relates to the technical field of aircraft. The variable pitch propeller includes a hub and blades; the fixed end of the linear drive assembly is arranged in the hub, and the output end of the linear drive assembly extends to the outside of the hub in a direction away from the electric engine; the variable pitch push plate is located on the side of the hub away from the electric engine and is connected to the variable pitch push plate, so as to reciprocate along the axial direction of the hub under the drive of the linear drive assembly; at least two variable pitch transmission assemblies correspond to at least two blades one by one, the variable pitch transmission assembly is located on the radial outer side of the hub, and the variable pitch transmission assembly is 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 present invention places the variable pitch push plate directly above the hub, so that the structural size of the variable pitch motor is not restricted and the structural strength is improved.

Description

Pitch-variable propeller, thrust assembly and aircraft

Technical Field

The invention relates to the technical field of aircrafts, in particular to a variable-pitch propeller, a thrust component and an aircraft.

Background

The pitch-variable propeller is a propeller capable of changing the blade angle through a pitch-variable assembly in flight. In the related art, the pitch-changing assembly comprises a pitch-changing push disc which is arranged in the hub and moves up and down along the axial direction of the main shaft of the propeller under the action of a pitch-changing motor. The variable-pitch pushing disc is respectively connected with a plurality of paddles through a plurality of connecting rods, so that the corresponding paddles are driven to swing relative to the hub through the connecting rods when the variable-pitch pushing disc moves up and down.

However, because the space in the hub is limited, the size of the pitch-changing pushing disc is limited to influence the structural strength of the pitch-changing pushing disc, so that the stress of each pitch-changing transmission assembly is uneven, and the pitch-changing consistency of the blade is required to be improved.

Disclosure of Invention

The invention mainly aims to provide a variable-pitch propeller, a thrust assembly and an aircraft, and aims to solve the technical problem that the variable-pitch consistency of blades is to be improved due to the fact that a variable-pitch pushing disc in the related art is arranged in a hub.

In order to achieve the above object, the present invention provides a variable pitch propeller, comprising:

a hub adapted to be connected with an outer rotor of the electric motor;

at least two blades rotatably connected to the peripheral wall of the hub about the pitch axis of the blades;

The fixed end of the linear driving assembly is arranged in the hub, and the output end of the linear driving assembly extends to the outside of the hub along the direction away from the motor;

a variable-pitch pushing disc which is positioned on one side of the hub away from the motor and is connected with the output end so as to reciprocate along the axial direction of the hub under the drive of the linear driving assembly, and

The pitch-changing transmission assemblies are in one-to-one correspondence with the at least two paddles, are positioned on the radial outer side of the hub, and are respectively connected with the pitch-changing pushing disc and the paddles so that the pitch-changing pushing disc drives the paddles to swing through the pitch-changing transmission assemblies.

In an embodiment, the variable pitch propeller further comprises:

At least two stable subassembly, stable subassembly are suitable for along the axial flexible of oar hub, and stable subassembly's one end is articulated with the outer fringe of displacement pushing disc, and stable subassembly's the other end is articulated with the oar hub, and at least two stable subassemblies set up along the even interval of the circumferencial direction of displacement pushing disc.

In an embodiment, at least two blades are provided with stabilizing assemblies uniformly spaced in the circumferential direction of the hub in a number consistent with the number of blades and in one-to-one correspondence with each other.

In one embodiment, the stabilizing assemblies and the pitch drive assemblies alternate with each other in the circumferential direction of the pitch push plate.

In one embodiment, the stabilizing assembly comprises:

a first connecting arm, one end of which is hinged with the outer edge of the variable-pitch pushing disc, and

A second connecting arm, one end of which is hinged with the other end of the first connecting arm, the other end of which is hinged with the paddle hub, and an included angle exists between the first connecting arm and the second connecting arm, and

The elastic piece is arranged between the first connecting arm and the second connecting arm.

In an embodiment, on a plane of the variable-pitch pushing disc, the projection of the first connecting arm and the projection of the second connecting arm are located radially outside the variable-pitch pushing disc.

In an embodiment, 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.

In one embodiment, the linear drive assembly includes:

The variable-pitch motor is arranged in the propeller hub, and the variable-pitch motor is configured to be a fixed end;

A screw rod extending in the axial direction of the hub, one end of the screw rod being connected to the output shaft of the variable-pitch motor in the hub and the other end of the screw rod extending out of the hub in a direction away from the motor, and

A moving member threadedly coupled to a portion of the lead screw extending outside the hub to form an output end, and

One end of the telescopic piece is connected with the body of the pitch-changing motor, the other end of the telescopic piece is connected with the moving piece, and the telescopic piece is suitable for extending and retracting along the axial direction of the propeller hub.

In one embodiment, a blade includes:

The paddle handle is rotatably arranged on the paddle hub, and one end of the paddle handle extends out of the paddle hub along the radial direction of the paddle hub;

the paddle blade is fixedly connected with one end of the paddle handle, and the paddle blade is spaced from the peripheral wall of the paddle hub so that part of the paddle handle is exposed;

one end of the variable-pitch transmission assembly is connected with the exposed part of the paddle handle.

In one embodiment, the pitch-varying transmission assembly comprises a pitch-varying connecting rod and a pitch-varying pin, one end of the pitch-varying connecting rod is hinged with the pitch-varying push disc, the other end of the pitch-varying connecting rod is hinged with one end of the pitch-varying pin, and the other end of the pitch-varying pin is fixedly connected with the blade so as to rotate around the pitch-varying axis of the blade;

wherein, the length of the variable-pitch connecting rod is adjustable.

In one embodiment, a pitch link includes:

A fixing section with two open ends in the axial direction, wherein the fixing section is internally limited with a containing cavity communicated with the two openings;

the first moving section extends into the accommodating cavity from an opening at one end of the fixed section and can move along the axial direction of the fixed section;

a second moving section, part of which extends into the accommodating cavity from the other end opening of the fixed section and can move along the axial direction of the fixed section, and

The distance adjusting structure is partially arranged in the accommodating cavity and is respectively connected with the first moving section and the second moving section to adjust the distance between the first moving section and the second moving section;

The locking piece is matched with the fixed section and the distance adjusting structure respectively so as to lock the distance adjusting structure.

In one embodiment, the distance adjusting structure comprises:

A knob part rotatably arranged on the outer peripheral wall of the fixed section;

The matching part is arranged in the accommodating cavity and fixedly connected with the knob part, and a cam groove is formed in the end face of one side, away from the knob part, of the matching part;

Wherein, the first movable section includes first bulge, and first bulge stretches into in the cam groove and with the slidable cooperation of cam groove, and the second movable section includes the second bulge, and the second bulge stretches into in the cam groove and with the slidable cooperation of cam groove.

In one embodiment, the first moving section further comprises a first rod body, a first elastic layer and a second rod body which are sequentially connected along the axial direction of the fixed section, wherein the first rod body and/or the second rod body moves along the axial direction of the fixed section in the fixed section, and/or

The second moving section further comprises a third rod body, a second elastic layer and a fourth rod body which are sequentially connected along the axial direction of the fixed section, and the third rod body and/or the fourth rod body move along the axial direction of the fixed section in the fixed section.

In an embodiment, the pitch propeller further comprises at least two angle sensors, the at least two angle sensors are in one-to-one correspondence with the at least two blades, and the angle sensors are arranged at the portions of the blades extending into the hub.

In addition, the invention also provides a thrust assembly comprising:

A variable pitch propeller as above, and

And the motor is connected with the hub of the variable-pitch propeller.

In addition, the invention also provides an aircraft, which comprises:

aircraft body, and

At least one thrust assembly as above, the thrust assembly being disposed on the aircraft body.

In one embodiment, the aircraft is an electric vertical takeoff and landing aircraft.

One or more technical schemes provided by the invention have at least the following technical effects:

Compared with the space of the variable-pitch pushing disc arranged in the propeller hub in a limited manner, in the technical scheme of the variable-pitch propeller, the linear driving assembly for driving the variable-pitch pushing disc to reciprocate along the axial direction of the propeller hub is arranged in the propeller hub, and the variable-pitch pushing disc is positioned on one side of the propeller hub, which is away from the motor, i.e. the variable-pitch pushing disc is arranged right above the propeller hub, so that the structural size of the variable-pitch motor is not limited by the size of the propeller hub, the structural strength of the variable-pitch pushing disc is improved, the structural strength uniformity of the variable-pitch pushing disc is improved, and the variable-pitch consistency is improved.

In addition, the pitch drive assembly is disposed outside the hub, as compared to when the pitch drive assembly is mounted within the hub, the pitch drive assembly is not limited by the internal dimensions of the hub, thereby achieving higher structural strength through a larger dimension.

In addition, in the invention, the control module for providing electric energy for the variable-pitch motor and transmitting control signals is integrated in the inner stator, so that the assembly of the thrust component can be facilitated, the assembly process is reduced, and the assembly efficiency is improved. In addition, the control module of the variable-pitch motor and the motor controller of the motor engine are integrated in the inner stator, and through a unified control framework, the system design is simplified, the control efficiency is improved, the development and maintenance cost is reduced, and meanwhile, the maintainability of the thrust component is improved. Of course, both redundant configurations can be facilitated, thereby improving safety. In addition, the control module of the variable-pitch motor is arranged in the inner stator, the integration level is high in a limited installation space, and a better cooling effect can be obtained by using the cooling assembly of the electric engine.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a thrust assembly provided by the invention, wherein a variable-pitch motor is fixedly connected with an outer rotor of an electric engine;

FIG. 2 is a schematic view of an electric motor of the thrust assembly of the present invention, wherein the electric motor includes a drive shaft;

FIG. 3 is a schematic structural view of a thrust assembly according to the present invention, wherein a variable-pitch motor is fixedly connected with an inner stator of an electric motor;

FIG. 4 is a schematic view of an electric motor of the thrust assembly of the present invention, wherein the electric motor includes an eccentric shaft;

FIG. 5 is a schematic cross-sectional view of the thrust assembly of the present invention at the support cap;

FIG. 6 is a schematic exploded view of the structure at the support cap of the thrust assembly provided by the present invention;

FIG. 7 is a schematic view of a stabilizing assembly of the thrust assembly provided by the present invention;

FIG. 8 is a gain schematic of a stabilization assembly of a thrust assembly provided by the present invention;

FIG. 9 is a schematic view of the fit of the lead screw nut structure of the thrust assembly provided by the present invention;

FIG. 10 is a schematic diagram of an embodiment of a torque transmission assembly of a thrust assembly according to the present invention;

FIG. 11 is a schematic view of the internal structure of a pitch link of the thrust assembly provided by the present invention;

FIG. 12 is a schematic view of a pitch adjustment structure of a thrust assembly provided by the present invention;

FIG. 13 is a schematic view of another embodiment of a torque transmission assembly of a thrust assembly provided by the present invention.

Reference numerals illustrate:

100. An electric motor; 110, conductive slip rings, 111, slip ring rotors; 112, slip ring stator, 101, outer rotor, 1012, rotating shaft, 1011, through hole, 102, inner stator, 103, rear cover, 104, cooling module, 1051, transmission shaft, 1052, eccentric shaft, 1061, inner gear ring, 1062, mating gear, 1071, supporting lower cover, 10711, lower protruding portion, 1072, supporting upper cover, 10721, upper protruding portion, 1073, wiring hole, 200, hub, 300, variable-pitch thrust plate, 400, linear driving module, 410, variable-pitch motor, 420, lead screw, 430, moving member, 440, telescoping member, 500, variable-pitch transmission module, 510, fixed section, 520, first moving section, 521, first rod, 522, second rod, 523, first elastic layer, 524, first protruding portion, 530, second moving section, 531, fourth rod, 532, third rod, 533, second elastic layer, 534, second protruding portion, 40, pitch adjusting structure, knob, 542, mating portion, 5421, 550, rotating pin, 560, rotating arm, 720, bearing, 720, 700, bearing, 720, and steady arm, 720, and shaft.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear are referred to in the embodiments of the present invention), the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture, and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The pitch-variable propeller is a propeller capable of changing the blade angle through a pitch-variable assembly in flight.

In the related art, the pitch-changing assembly comprises a pitch-changing push disc which is arranged in the hub and moves up and down along the axial direction of the main shaft of the propeller under the action of a pitch-changing motor. The variable-pitch pushing disc is respectively connected with a plurality of paddles through a plurality of connecting rods, so that the corresponding paddles are driven to swing relative to the hub through the connecting rods when the variable-pitch pushing disc moves up and down.

In addition, when the displacement pushing disc is arranged in the propeller hub, a linear guide rod is usually arranged on the displacement pushing disc and used for guiding and stabilizing the displacement pushing disc, but because the space in the propeller hub is limited, the stabilizing effect of the linear guide rod is greatly limited, the stability of the displacement pushing disc movement is difficult to ensure, and the displacement pushing disc is highly likely to incline to one side, so that the consistency of the blade displacement cannot be well ensured.

Therefore, the invention provides the variable-pitch propeller, the linear driving component for driving the variable-pitch pushing disc to reciprocate along the axial direction of the propeller hub is arranged in the propeller hub, and the variable-pitch pushing disc is positioned on one side of the propeller hub, which is away from the motor, i.e. the variable-pitch pushing disc is propped against the upper part of the propeller hub, so that the structural size of the variable-pitch motor is not limited by the size of the propeller hub, the structural strength of the variable-pitch pushing disc is further improved, the structural strength uniformity of the variable-pitch pushing disc is improved, and the variable-pitch consistency is improved.

Referring to fig. 1, the present embodiment provides a pitch propeller, which includes a hub 200, at least two blades 600, a pitch-shifting disk 300, a linear driving assembly 400, and at least two pitch-shifting transmission assemblies 500.

The variable-pitch propeller comprises a hub 200, a variable-pitch transmission assembly 500, a variable-pitch propeller 300, a variable-pitch propeller disc 300, at least two variable-pitch transmission assemblies 500 and at least two blades 600, wherein the hub 200 is suitable for being connected with an outer rotor of an electric motor 100, the blades 600 are rotatably connected to the peripheral wall of the hub 200 around a variable-pitch shaft of the blade 600, a fixed end of the linear driving assembly 400 is arranged in the hub 200, an output end of the linear driving assembly 400 extends out of the hub 200 along a direction away from the electric motor 100, the variable-pitch propeller disc 300 is positioned at one side of the hub 200 away from the electric motor 100 and is connected with the output end so as to be driven by the linear driving assembly 400 to reciprocate along the axial direction of the hub 200, the variable-pitch transmission assemblies 500 are positioned at the radial outer side of the hub 200, and the variable-pitch transmission assemblies 500 are respectively connected with the variable-pitch propeller disc 300 and the blades 600 so that the variable-pitch propeller disc 300 can drive the blades 600 to swing through the variable-pitch transmission assemblies 500.

Specifically, the propeller includes a hub 200 and blades 600, wherein the hub 200 mounts a joint portion for each blade 600, and a plurality of blades 600 are uniformly mounted on an outer circumferential wall of the hub 200. The hub 200 itself is connected to the mechanical coupling end of the motor-generator 100, so that the hub 200 rotates about its own axis of rotation under the drive of the motor-generator 100. Hub 200 is the entire rotor axis of the pitch propeller about its own axis of rotation. The number of blades 600 includes at least 2, but may be more.

Since the propeller provided in this embodiment is a pitch-variable propeller, the blade 600 is not completely fixed in the hub 200, but is rotatably connected to the outer peripheral wall of the hub 200, i.e., can rotate around its own pitch-variable axis, thereby changing the angle of attack of the blade 600.

Hub 200 is a hollow structure with an interior space configured to receive a bore. The receiving hole has a linear driving assembly 400 mounted therein. The output end of linear drive assembly 400 extends upwardly in a direction away from motor 100 and out of hub 200. It will be appreciated 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 disc 300 such that the variable-pitch push disc 300 reciprocates in the axial direction of the hub 200, i.e., approaches or moves away from the hub 200 above the hub 200, on the side of the hub 200 facing away from the motor 100 (above the hub 200), under the drive of the output end. The pitch-varying push disc 300 is connected with each blade 600 through the pitch-varying transmission assembly 500, so as to drive each blade 600 to swing together around its own pitch-varying axis.

As can be seen, compared with the space of the pitch-shifting disc 300 inside the hub 200 being limited, the present embodiment places the linear driving assembly 400 driving the pitch-shifting disc 300 to reciprocate along the axial direction of the hub 200 inside the hub 200, and the pitch-shifting disc 300 is located at one side of the hub 200 away from the motor 100, i.e. the pitch-shifting disc 300 is disposed directly above the hub 200, so that the structural size of the pitch-shifting motor 410 is not limited by the size of the hub 200, and the structural strength of the pitch-shifting disc 300 is improved, so as to improve the uniformity of the structural strength of the pitch-shifting disc 300 and the pitch uniformity.

In addition, the variable-pitch pushing disc 300 is arranged on the top, and enough space is provided around the variable-pitch pushing disc 300 for installing other variable-pitch auxiliary structures, so that the variable-pitch reliability is further facilitated.

In addition, the linear drive assembly 400 is mounted within the hub 200, which may be relatively stationary with respect to the hub 200. In an embodiment, referring to fig. 1 and 2, an electric engine 100 includes an outer rotor 101 and an inner stator 102, the outer rotor 101 is provided with a through hole 1011, a central axis of the through hole 1011 is collinear with a central axis of the outer rotor 101, a control module is disposed in the inner stator 102, a fixed end of a linear driving assembly 400 is adapted to be fixedly connected with the outer rotor 101, and a variable-pitch thrust plate 300 is fixedly connected with an output end, the electric engine 100 further includes an electrically conductive slip ring 110, the electrically conductive slip ring 110 is disposed at the through hole 1011, and a central axis of the electrically conductive slip ring 110 and a rotation axis of a hub 200 are both collinear with a central axis (rotor axis) of the variable-pitch propeller, a slip ring stator 112 of the electrically conductive slip ring 110 is fixedly connected with the inner stator 102 and electrically connected with the control module, and a slip ring rotor 111 of the electrically conductive slip ring 110 is fixedly connected with the fixed end and electrically connected with an electrically connected portion of the fixed end.

Specifically, the motor engine 100 in the present embodiment is an external rotor motor. The rotor of the outer rotor motor forms an outer rotor 101 in the outer shape, while the stator forms an inner stator 102 in the inner. The stator 102 includes a stator housing, a stator core and a winding, the stator core is disposed in the stator housing, and the winding is embedded in a stator slot of the stator core. At this time, the shaft hole of the stator housing is formed as a central shaft hole of the inner stator 102, that is, a central axis of the central shaft hole is collinear with a central axis of the inner stator 102. It will be appreciated that the center axis of the inner stator 102 and the center axis of the outer rotor 101 are both collinear with the center axis of the motor 100. The internal stator 102 also has a control module therein to output a control signal and provide electric power.

One side of the outer rotor 101 is an open end from which the inner stator is mounted into the outer rotor 101. The other side of the outer rotor 101 is a mechanical coupling end, which is connected to the hub 200 to transmit force, motion and torque so that the propeller generates lift and thrust required for flight. As such, motor 100 may be considered to be located below hub 200.

For the linear motion provided by the linear drive assembly 400, the fixed end is the stationary portion and the output end is the portion that moves linearly, i.e., the output end moves linearly with respect to the fixed end. Since the fixed end is connected with the outer rotor 101, the fixed end also continuously rotates along with the outer rotor 101 during the operation of the variable pitch propeller. At this time, power supply and communication to the fixed end can be achieved through the conductive slip ring 110. The conductive slip ring 110 mainly consists of two parts, namely a rotating part and a stationary part. The rotating part is connected to the fixed end and rotates with the fixed end to form a slip ring rotor 111, and the stationary part is connected to an inner stator 102 of the motor 100, which is called a slip ring stator 112. And in order that the rotational movement of the conductive slip ring 110 does not affect the rotation of the hub 200, the central axis of the conductive slip ring 110 is collinear with the rotational axis of the hub 200. Of course, in order to achieve power supply and control of the linear driving assembly 400, the slip ring stator 112 may be electrically connected with the control module in the inner stator 102, and the slip ring rotor 111 is simultaneously electrically connected with the electrical connection part of the fixed end, thereby achieving power supply and communication control of the variable-pitch motion.

In one embodiment, the electric engine 100 further includes a rear cover 103, a cooling assembly 104, and a transmission shaft 1051. The rear cover 103 is arranged on one side of the inner stator 102, which is away from the variable pitch propeller, the cooling component 104 is arranged on one side of the rear cover 103, which is away from the inner stator 102, the transmission shaft 1051 is rotatably arranged in a central shaft hole of the inner stator 102 around the central axis of the transmission shaft 1051, the central axis of the transmission shaft 1051 is collinear with the central axis of the central shaft hole, one end of the transmission shaft 1051 is in transmission connection with the cooling component 104, and the other end of the transmission shaft 1051 is in transmission connection with the outer rotor 101, so that the outer rotor 101 drives the cooling component 104 through the transmission shaft 1051.

The cooling assembly 104 may include an air cooling assembly (e.g., a radiator fan), a liquid cooling assembly (e.g., a heat exchanger and a pumping assembly that pumps a cooling fluid into the motor to cause the cooling fluid to flow through the interior of the motor), or a combination of an air cooling assembly and a liquid cooling assembly.

Since the central shaft hole inside the inner stator 102 is communicated with the two axial ends of the inner stator 102, and the outer rotor 101 and the cooling assembly 104 are respectively located at the two axial ends of the inner stator 102, in this embodiment, the transmission shaft 1051 is disposed in the central shaft hole, one end extends to the mechanical connection end and is in transmission connection with the outer rotor 101, and the other end extends to the cooling assembly 104 through the rear cover 103 and is in transmission connection with the cooling assembly 104, so that the rotation motion of the outer rotor 101 is transmitted to the cooling assembly 104, and the air cooling assembly and/or the liquid cooling assembly of the cooling assembly 104 are driven to start to operate.

It can be seen that, in this embodiment, a transmission shaft 1051 is disposed in a coaxial manner in the existing space in the inner stator 102 of the outer rotor motor, that is, in the central shaft hole penetrating the inner stator 102 along the axial direction of the inner stator 102 in the inner stator 102, and the transmission shaft 1051 is used for driving and connecting the outer rotor 101 with the cooling assembly 104 that takes away the heat generated during the operation of the motor, so that the cooling assembly 104 is driven by the outer rotor 101 in the motor 100, and the independent electric driving assembly and the required circuit wiring structure required by the cooling assembly 104 are omitted, thereby optimizing the overall weight of the motor 100. In addition, the outer rotor 101 drives the cooling assembly 104 through a transmission shaft of a mechanical transmission structure, which is more reliable and safer than a separate electric driving assembly.

It should be noted that, since the transmission shaft 1051 is disposed at the central axis of the inner stator 20, the transmission shaft 1051 may be directly fixedly connected with the rotation shaft 1012. Referring to fig. 2, one end of the transmission shaft 1051 extends into the shaft hole of the shaft 1012 and is fixedly connected with the inner peripheral wall of the shaft 1012 through the first mating portion. The first fitting portion may be configured as a plurality of arms which are arranged uniformly and at intervals in the circumferential direction of the driving shaft 1051, the arms extending to be fixedly coupled with the inner circumferential wall of the rotation shaft 1012. In one example, the plurality of arms are configured in a cross-shaped configuration. Or alternatively the first mating portion may be configured as a disc member.

It is apparent that, in the present embodiment, the arrangement of the drive shaft 1051 at the central axis of the inner stator 102 can make the drive shaft 1051 less interfering with the operation of the inner stator 20 and the outer rotor 101, and can also make the weight distribution of the motor-generator 100 symmetrical. In addition, most of the transmission shaft 1051 in this embodiment is disposed in the central shaft hole in the inner stator 102, and the existing structure and layout of the motor and cooling assembly 104 in the motor assembly are not changed, so that the popularization and use in existing products are facilitated. In addition, the present embodiment eliminates the need for a separate electric drive assembly for the cooling assembly 104, and may also circumvent the heat dissipation problem and heat dissipation risk of the separate drive motor.

In one embodiment, one end of the drive shaft 1051 is fixedly coupled to the shaft 1012 through the slip ring stator 112. Specifically, referring to fig. 2, both the conductive slip ring 110 and the transmission shaft 1051 are located on the central axis of the inner stator 102, so that the overall structure is more compact in order to reduce the space occupied by both the conductive slip ring 110 and the transmission shaft 1051 on the central axis of the inner stator 102, and thus, one end of the transmission shaft 1051 passes through the slip ring stator 112 and is fixedly connected with the rotation shaft 1012. Of course, the conductive slip ring 110 may be located in the rotation shaft hole, may be located at the junction of the central shaft hole of the inner stator 102 and the rotation shaft hole, or may be located at the position of the central shaft hole of the inner stator 102 near the rotation shaft hole, which is not limited in this embodiment.

Or the linear driving assembly 400 may further rotate in the hub 200 relative to the hub 200, for example, in another embodiment, the motor 100 includes an outer rotor 101 and an inner stator 102, the outer rotor 101 is provided with a through hole 1011 penetrating through the outer rotor 101 along the axial direction of the hub 200, the central axis of the through hole 1011 is collinear with the rotation axis of the hub 200, a control module is disposed in the inner stator 102, the fixed end of the linear driving assembly 400 is adapted to be fixedly connected with the inner stator 102 through the through hole 1011, the pitch propeller further includes a connecting cable (not shown) and a pitch bearing 800, one end of the connecting cable is connected with the fixed end, and the other end of the connecting cable passes through the through hole 1011 and extends into the inner stator 102 to be connected with the control module, and the pitch pushing disc 300 is rotatably connected with the output end through the pitch bearing 800.

Specifically, referring to fig. 4, a through hole 1011 is formed along the axial direction of the motor 100 at the center axis of the mechanical coupling end of the outer rotor, and the through hole 1011 communicates with the space inside the outer rotor 101, thereby providing a passage for connecting the fixed end with the inner stator 102. At this time, the fixed end is fixedly connected with the inner stator 102 through a connection structure additionally provided in the through hole, or the fixed end is fixedly connected with the inner stator 102 through the through hole in order to reduce the overall weight of the thrust assembly, so that the linear driving assembly 400 does not rotate in the hub 200 following the hub 200. At this time, referring to fig. 3, the pitch disc 300 is engaged with the output end through the pitch bearing 800, so that the linear driving assembly 400 is kept relatively stationary while the pitch disc 300 follows the rotation of the hub 200. It will be appreciated that since the linear driving assembly 400 is fixedly connected to the inner stator 102, no relative movement occurs between the two, and thus, the connection between the fixed end and the control module can be achieved through a connection cable. Of course, the connection cable may be a power supply cable, a communication cable, or a power supply communication cable, which is not limited in this embodiment.

It will be appreciated that in this embodiment, the linear drive assembly 400 is separated from the motion of the hub 200 by the pitch bearing 800, and the linear drive assembly 400 can be directly electrically connected to the control module on the inner stator 102 of the motor 100 by a connection cable, so as to achieve stable and reliable power supply and signal transmission.

In one embodiment, electric motor 100 further includes rear cover 103, cooling assembly 104, and eccentric shaft 1052. The rear cover 103 is arranged on one side of the inner stator 102, which is away from the variable pitch propeller, the cooling assembly 104 is arranged on one side of the rear cover 103, which is away from the inner stator 102, the eccentric shaft 1052 is rotatably arranged in a central shaft hole of the inner stator 102 around the central axis of the eccentric shaft 1052, the central axis of the eccentric shaft 1052 is parallel to and spaced from the central axis of the central shaft hole, one end of the eccentric shaft 1052 is in transmission connection with the cooling assembly 104, and the other end of the eccentric shaft 1052 is in transmission connection with the outer rotor 101, so that the outer rotor 101 drives the cooling assembly 104 through the eccentric shaft 1052.

Referring to fig. 4, since the central shaft hole inside the inner stator 102 communicates with the two axial ends of the inner stator 102, and the outer rotor 101 and the cooling assembly 104 are respectively located at the two axial ends of the inner stator 102, in this embodiment, a part of the eccentric shaft 1052 is disposed in the central shaft hole, one end extends to the mechanical coupling end and is in driving connection with the outer rotor 101, and the other end extends to the cooling assembly 104 and is in driving connection with the cooling assembly 104, so that the rotational motion of the outer rotor 101 is transmitted to the cooling assembly 104, so as to drive the air cooling assembly and/or the liquid cooling assembly of the cooling assembly 104 to start to operate.

It can be seen that in this embodiment, in the existing space in the inner stator 102 of the motor of the outer rotor 101, that is, in the central shaft hole penetrating through the inner stator 102 along the axial direction of the inner stator 102 in the inner stator 102, an eccentric shaft 1052 is additionally arranged, and the eccentric shaft 1052 drives and connects the outer rotor 101 with the cooling component 104 that takes away the heat generated during the operation of the motor, so that the cooling component 104 is driven by the outer rotor 101 in the motor assembly, and the independent electric driving component and the required circuit wiring structure are omitted, thereby optimizing the overall weight of the motor assembly. In addition, outer rotor 101 drives cooling assembly 104 via mechanically driven eccentric shaft 1052, which is more reliable and safer than a separate electric drive assembly. In addition, most of the eccentric shaft 1052 in this embodiment is disposed in the central shaft bore in the inner stator 102 without changing the existing structure and layout of the motor and cooling assembly 104 in the motor assembly, thereby facilitating the promotion and use in existing products. In addition, the present embodiment eliminates the need for a separate electric drive assembly for the cooling assembly 104, and may also circumvent the heat dissipation problem and heat dissipation risk of the separate drive motor.

In addition, since the eccentric shaft 1052 rotates about its own central axis, and the central axes of the eccentric shaft 1052 and the rotating shaft 1012 are offset from each other, a corresponding transmission structure is also required to connect the rotating shaft 1012 and the eccentric shaft 1052 to transmit the rotational movement of the rotating shaft 1012 to the eccentric shaft 1052. It will be appreciated that eccentric shaft 1052 and shaft 1012 are driven between different shafts and thus may be implemented using gear sets or belts, etc. But the transmission belt and other structures may occupy the space in the rotation shaft hole, thereby affecting the layout of the connection cable. Therefore, in an embodiment, the electric engine further includes an inner gear ring 1061 and a mating gear 1062, the inner gear ring 1061 is fixedly connected to an end face of the rotating shaft 1012 near the inner stator 102, and a central axis of the inner gear ring 1061 is collinear with a central axis of the outer rotor 101, the mating gear 1062 is fixedly sleeved on the other end of the eccentric shaft 1052, and the mating gear 1062 is meshed with the inner gear ring 1061.

Specifically, referring to fig. 5 and 6, the ring gear 1061 is fixed to an end surface of the rotating shaft 1012 near the inner stator 102 by means of fasteners such as screws or welding, and a central axis of the ring gear 1061 is collinear with a central axis of the rotating shaft 1012. The mating gear 1062 is engaged with the ring gear 1061 in the ring gear 1061, and the mating gear 1062 is fixedly sleeved on one end of the eccentric shaft 1052 near the rotating shaft 1012. Thus, when shaft 1012 rotates, it also rotates ring gear 1061, and rotation of ring gear 1061 will rotate mating gear 1062 about the central axis of eccentric shaft 1052, i.e., rotate eccentric shaft 1052 about its own central axis.

It can be seen that, in this embodiment, since the ring gear 1061 is a ring-shaped member and is hollow, the ring gear 1061 does not occupy the front and rear spaces of the shaft hole in the axial direction, so that enough space is provided for the connection cable arrangement. In this manner, the connection cable may extend out of the motor assembly through the ring gear 1061 and the through-hole 1011 in sequence.

It should be noted that, in order to further avoid the ring gear 1061 from affecting the cable layout, the inner diameter of the ring gear 1061 may be larger than the inner diameter of the rotating shaft 1012, that is, the inner edge of the projection of the ring gear 1061 on the plane where the end face of the rotating shaft 1012 is located radially outside the inner edge of the rotating shaft 1012.

It will be appreciated that the mating gear 1062 will rotate at high speed while the motor is running, resulting in cable damage if the connecting cable touches the mating gear 1062. Therefore, in one embodiment, the motor-driven engine further comprises a supporting cover disposed in the through hole 1011 and fixedly connected with the inner stator 102, a part of the surface of one side end surface of the supporting cover is protruded to form a protrusion, and the protrusion is provided with a routing hole 1073 penetrating the supporting cover in the axial direction of the inner stator 102, wherein the protrusions are located at the radial outer side of the mating gear 1062 and spaced apart from each other.

Specifically, the support cover is positioned in the rotation shaft hole but is not fixedly connected with the rotation shaft 1012 but is fixedly connected with the inner stator 102, and an eccentric shaft bearing is mounted on the support cover, and the eccentric shaft bearing is matched with the eccentric shaft 1052 so as to rotate the eccentric shaft 1052 relative to the support cover. A part of the surface of one side end surface of the support cover protrudes outside the mating gear 1062 in the radial direction to form a protruding portion, and a routing hole 1073 through which the connection cable passes is formed in the protruding portion. The routing holes 1073 provide a separate routing space. Thus, when the connecting cable passes near the mating gear 1062, the connecting cable is restrained and protected by the hole wall of the routing hole 1073, so that the connecting cable is prevented from being damaged by the mating gear 1062 rotating at a high speed.

Referring to fig. 5 and 6, the support cover includes a support upper cover 1072 and a support lower cover 1071, and the support lower cover 1071 is fixed on an end surface of the inner stator 102 near the rotating shaft 1012. A part of the surface of the side end surface of the support lower cover 1071 near the rotation shaft 1012 is projected in a direction away from the inner stator 102 to form a lower projection 10711. The supporting upper cover 1072 is located in the rotating shaft 1012 and is not connected with the rotating shaft 1012, a part of the surface of one side end surface of the supporting upper cover 1072 close to the inner stator 102 protrudes and extends along the direction close to the inner stator 102 to form an upper protruding portion 10721, and the upper protruding portion 10721 abuts against the lower protruding portion 10711 and is fixedly connected with each other to form a protruding portion. At this time, the supporting upper cover 1072 and the supporting lower cover 1071 define a receiving space in which the mating gear 1062 and the eccentric shaft bearing are located. It is easy to see that, in this embodiment, two axial ends of the mating gear 1062 are covered by the supporting upper cover 1072 and the supporting lower cover 1071 respectively, so as to further avoid that foreign matters enter the electric engine from the hole of the rotating shaft, or avoid that electronic components in the inner stator 102 fall and move to the mating gear 1062 to affect the engagement of the mating gear 1062 and the inner gear ring 1061, and further improve the mating reliability of the mating gear 1062 and the inner gear ring 1061. In addition, the length of the connecting cable is always left, that is, the connecting cable is not a straight line but curved in the motor, so that the two axial ends of the mating gear 1062 are covered by the supporting upper cover 1072 and the supporting lower cover 1071 respectively, the connecting cable in the wiring hole 1073 is protected by the wall of the wiring hole 1073, and the connecting cable near the outside of the wiring hole 1073 is protected by the supporting upper cover 1072 and the supporting lower cover 1071, so that the connecting cable is jointly prevented from being damaged by the mating gear 1062 rotating at high speed.

The cross-sectional shape of the routing hole 1073 may be circular, or the like, however, since the mating gear 1062 occupies a part of the space defined by the spindle hole, in order to make the routing hole 1073 occupy more space in the remaining space to arrange more cables, in an embodiment, referring to fig. 6, the cross-section of the routing hole 1073 is arc-shaped and partially surrounds the mating gear 1062.

It should be noted that, in this embodiment, the control module for providing the electric energy and transmitting the control signal to the linear driving assembly 400 is integrated in the inner stator, so that the assembly of the thrust assembly can be facilitated, the assembly process is reduced, and the assembly efficiency is improved. In addition, the control module of the linear driving assembly 400 and the motor controller of the motor engine are integrated in the inner stator together, and through a unified control architecture, the system design is simplified, the control efficiency is improved, the development and maintenance costs are reduced, and meanwhile, the maintainability of the thrust assembly is improved. Of course, both redundant configurations can be facilitated, thereby improving safety. In addition, the control module of the linear driving assembly 400 is disposed in the inner stator, so that the integration level is high in a limited installation space, and a better cooling effect can be obtained by using the cooling assembly of the electric engine.

It will be appreciated that, after the pitch horn 300 is set up, due to factors such as complexity of the flight environment and manufacturing errors, different blades 600 may generate different overturning moments on the pitch horn 300, so that during rotation of the pitch horn 300, the pitch horn 300 is difficult to keep stable in a plane, and may tilt towards a part of the blades 600, thereby affecting pitch uniformity of the blades 600. Thus, in one embodiment, the pitch propeller further comprises at least two stabilizing assemblies 700, the stabilizing assemblies 700 are adapted to telescope in the axial direction of the hub 200, one end of each stabilizing assembly 700 is hinged to the outer edge of the pitch trimmer 300, the other end of each stabilizing assembly 700 is hinged to the hub 200, and the at least two stabilizing assemblies 700 are evenly spaced in the circumferential direction of the pitch trimmer 300.

In particular, referring to fig. 1,3 and 7, the stabilizing assembly 700 is adjustable in dimension in the axial direction of the hub 200 depending on its own structural characteristics, so as to accommodate the reciprocal movement of the pitch push plate 300 in the axial direction of the hub 200. In addition, the stabilizing assembly 700 provides a stabilizing force in the radial direction of the variable-pitch pusher disc 300 depending on the structural characteristics of the stabilizing assembly 700 itself, thereby also providing a stabilizing moment to the variable-pitch pusher disc 300. At least two stabilizing assemblies 700 are uniformly arranged along the circumferential direction of the pitch-push plate 300, so that when the pitch-push plate 300 is overturned to one side, at least part of the stabilizing assemblies 700 can provide stabilizing force on the radial direction of the pitch-push plate 300 by means of deformation of the stabilizing assemblies 700, so as to resist the overturned deformation of the pitch-push plate 300 and ensure plane stability during the rotation of the pitch-push plate 300.

It will be appreciated that since the blade 600 includes at least two, i.e., the overturning moment applied to the pitch horn 300 includes at least two, the number of stabilizing assemblies 700 includes at least 2, thereby resisting the overturning deformation of the pitch horn 300 and ensuring the planar stability during rotation of the pitch horn 300. Of course, since three points define a plane, the number of stabilizing assemblies 700 preferably includes at least 3, and the 3 stabilizing assemblies cooperate with each other to ensure that the plane of the variable-pitch pusher 300 is stable during rotation. Of course, since the number of blades 600 of a part of the propeller is more than 3, the number of stabilizing assemblies 700 should be as large as possible in order to further improve the planar stability of the pitch horn 300. As to balance as much as possible the overturning moment that varies in magnitude between different blades 600, in one embodiment the number of stabilizing assemblies 700 corresponds to the number of blades 600 and one to one with each other. Of course, at this time, at least two blades 600 are uniformly spaced apart in the circumferential direction of the hub 200. I.e. the number of stabilizing assemblies 700 corresponds to the number of blades 600, each blade 600 having a corresponding stabilizing assembly 700 to balance its overturning moment.

It can be seen that a plurality of pitch drive assemblies 500 and a plurality of stabilizing assemblies 700 are connected to the outer edge portion of the pitch push plate 300. Since pitch push plate 300 is positioned overhead of hub 200, the layout of pitch drive assembly 500 and stabilizing assembly 700 will affect the aerodynamic profile of the pitch propeller. In one embodiment, at least three stabilizing assemblies 700 and at least two pitch drive assemblies 500 alternate with each other in the circumferential direction of pitch push plate 300.

In particular, because pitch drive assembly 500 is used to drive blade 600 in oscillation about its pitch axis, pitch drive assembly 500 is generally disposed off-center relative to the pitch axis of blade 600. At this time, the stabilizing assemblies 700 may be disposed opposite to the pitch axis of the corresponding blade 600 such that the pitch drive assemblies 500 and the stabilizing assemblies 700 are alternately disposed with each other in the circumferential direction of the pitch-varying push plate 300, i.e., the pitch drive assemblies 500 and the stabilizing assemblies 700 are staggered from each other in the circumferential direction, avoiding the overall size increase of the pitch propeller caused by the interference of the two in the radial direction of the pitch-varying push plate 300. Of course, it is also advantageous to use a cover of as small a size as possible to entirely encase the pitch horn 300, the pitch drive assembly 500 and the stabilizing assembly 700 to improve the aerodynamic profile of the pitch propeller.

The aforementioned stabilizing assemblies 700 include, but are not limited to, linear guides, telescoping cylinders, and the like. Or in an embodiment, the stabilizing assembly 700 includes a first connecting arm 710, a second connecting arm 720, and a resilient member 730. One end of the first connecting arm 710 is hinged to the variable-pitch pushing disc 300, one end of the second connecting arm 720 is hinged to the other end of the first connecting arm 710, the other end of the second connecting arm 720 is hinged to the hub 200, an included angle exists between the first connecting arm 710 and the second connecting arm 720, and the elastic piece 730 is arranged between the first connecting arm 710 and the second connecting arm 720.

Specifically, referring to fig. 7, the first connecting arm 710 and the second connecting arm 720 are hinged to each other to form a V-shaped two-bar structure. The angle between the first connection arm 710 and the second connection arm 720 becomes larger when the pitch trimmer 300 is away from the hub 200, and the angle between the first connection arm 710 and the second connection arm 720 becomes smaller when the pitch trimmer 300 is close to the hub 200. The V-shaped structure can fully adapt to the pulling and pressing load of the variable-pitch push disc 300 in the axial direction and the radial direction thereof through the change of the included angle between the first connecting arm 710 and the second connecting arm 720 compared with the swing of the variable-pitch push disc 300 and the swing of the second connecting arm 720 compared with the swing of the hub 200. In addition, when the pitch-changing push plate 300 approaches or departs from the hub 200, the included angles of the two link structures are changed together, so that the pitch-changing push plate 300 is guided together, and the pitch-changing push plate 300 is ensured to reciprocate along the axial direction of the hub 200. In addition, the V-shaped two-bar structure forms a triangle unit, and the stability principle of the triangle unit is utilized to make the strength of the materials for manufacturing the first connecting arm 710 and the second connecting arm 720 fully play under each included angle state.

An elastic member 730 is installed between the first connecting arm 710 and the second connecting arm 720, and the elastic member 730 is configured to provide a balancing moment by using the deformation of the elastic member 730 when the pitch-changing push plate 300 is tilted to change the included angle between the first connecting arm 710 and the second connecting arm 720, so that the balancing moment provided by the elastic members 730 of all the stabilizing assemblies 700 resists the tilting moment of the pitch-changing push plate 300 together to maintain the stability of the pitch-changing push plate 300.

In addition, the stabilizing assembly 700 may also function to dampen vibration and reduce load through the provision of the elastic member 730. The elastic member 730 includes, but is not limited to, an extension spring, a compression spring, a torsion spring, or the like. 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 that compared with the extension 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 beneficial to simplifying the aerodynamic profile of the pitch propeller, and also avoids occupying the space inside the pitch changing push disc 300 and the hub 200 to influence the reciprocating movement of the pitch changing push disc 300.

It should be noted that, compared with other configurations of stabilizing components, the triangle structure is also suitable for the situation of bearing the overturning moment, and the combination of more than 3V-shaped two-link structures and the elastic member 730 enables the variable-pitch pushing disc 300 to have strong anti-overturning moment capability, so as to ensure the pitch consistency of each blade 600.

Further, in the present embodiment, referring to fig. 8, a change in spring gain of the elastic member 730 and motor load (torque value) of the motor engine 100 with the aerodynamic torque load from a hover to a tilt condition is shown (in which the spring gain of the elastic member 730 approximately conforms to hooke's law, and its elastic value is changed with the length of the spring). The presence of the spring 730 causes the drive load of the pitch motor 410 to be reduced on average, with the integrated spring 730 having a considerable power gain.

In addition, when the pitch propeller is subjected to unsteady pitch load fluctuation (such as gusts, diagonal flows, etc.), the elastic member 730 also provides a balancing moment so that the disturbance is rapidly reduced, and the disturbance resistance of the pitch-push plate 300 is improved.

It will be appreciated that, as an alternative to 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 pitch horn 300, that is, on the plane of the pitch horn 300, the projection of the first connecting arm 710 and the projection of the second connecting arm 720 are both located on the pitch horn 300. Alternatively, the projection of the first connecting arm 710 and the projection of the second connecting arm 720 are located radially outside the pitch horn 300 on the plane of the pitch horn 300.

It is apparent that, compared to the V-shaped structure formed by the first connecting arm 710 and the second connecting arm 720 being located in the lower inner area of the pitch propeller 300, the V-shaped structure formed by the first connecting arm 710 and the second connecting arm 720 being located outside the pitch propeller 300 does not occupy the space between the pitch propeller 300 and the hub 200 in the axial direction of the hub 200, and the increase of the space between the pitch propeller 300 and the hub 200 resulting in the increase of the overall axial dimension of the pitch propeller is avoided.

It should be noted that the stabilizing assembly 700 may also be configured as an elastic damper, shock absorber, etc., so that the shock absorbing and load reducing effects provided by the aforementioned elastic member can be achieved on the basis of the anti-overturning effect achieved by the structural rigidity.

It is to be appreciated that the aforementioned linear drive assembly 400 includes, but is not limited to, an electric push rod, a linear motor, a pneumatic cylinder, a hydraulic cylinder, and the like. Or in an embodiment, the linear drive assembly 400 includes a variable pitch motor 410, a lead screw 420, a mover 430, and a retractor 440. The body of the variable-pitch motor 410 is disposed in the hub 200, the variable-pitch motor 410 is configured as a fixed end, the screw 420 extends along the axial direction of the hub 200, one end of the screw 420 is connected with an output shaft of the variable-pitch motor 410 in the hub 200, the other end of the screw 420 extends out of the hub 200 in a direction away from the motor 100, and the moving member 430 is in threaded connection with a portion of the screw 420 extending out of the hub 200 to configure an output end. One end of the telescopic member 440 is connected with the body of the pitch motor 410, the other end of the telescopic member 440 is connected with the moving member 430, and the telescopic member 440 is adapted to be telescopic in the axial direction of the hub 200.

Specifically, referring to fig. 1 and 3, the linear driving assembly 400 in the present embodiment is a combination of a motor and a screw nut structure for converting a rotational motion of an output shaft of the motor into a linear motion, thereby driving the moving member 430 to move in an axial direction of the hub 200 to be away from or close to the hub 200. In the embodiment, the screw nut has compact structure, stable transmission and high positioning precision, thereby being suitable for the use scene of the screw propeller.

Or 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, by connecting cables. In this way, the variable-pitch motor 410 is formed into a double winding structure, thereby forming a double redundancy configuration to improve safety. At this time, as the double winding design increases the volume of the variable-pitch motor and the space in the hub is limited, the control module can be arranged in the inner stator in order to arrange the control module corresponding to the variable-pitch motor.

Of course, in order to make the screw nut structure operate smoothly, the thrust assembly needs to add a bracket in the screw nut structure, that is, the moving member reciprocates on the bracket along the axial direction of the screw and limits the moving member 430 to rotate along with the screw 420 through the bracket. Since the pitch disc 300 will rotate with the hub 200, the bracket is adapted to be provided as a telescopic member 440 in this embodiment. One end of the expansion member 440 extends into the hub 200 to be connected to the variable motor 410, and the other end is connected to the moving member 430. Since the telescoping member 440 is configured to telescope in the axial direction of the hub 200, the displacement member 430 will also reciprocate only in the axial direction of the hub 200.

It will be appreciated that the number of telescoping members 440 may be set to one or more. Of course, since the pitch-shifting push plate 300 is subject to the pitch-shifting load of each blade, and thus has a tendency to topple and deflect, that is, the moving member 430 also has a tendency to topple and deflect, the plurality of telescopic members 440 are preferably included, and the plurality of telescopic members 440 are uniformly arranged along the circumferential direction of the moving member 430, so as to preferably resist the tendency to topple and deflect of the moving member 430, and ensure that the moving member 430 moves linearly in the axial direction of the hub 200 smoothly.

It should be noted that the telescopic member 440 includes, but is not limited to, a linear telescopic member such as a telescopic cylinder, and a hinge structure such as a hinge or a two-bar hinge. As shown in fig. 3, the telescopic member 440 is configured as a two-bar linkage, and the hinge axes of the two-bar linkage are perpendicular to the axial direction of the hub 200, such that the length of the two-bar linkage in the axial direction of the hub 200 changes with the change of the included angle of the two-bar linkage.

In addition, referring to fig. 9, the elastic member 730 further adds a pre-tightening force to the pitch-shifting disc 300, and the component force of the stabilizing assembly 700 in the axial direction of the hub 200 provides the pre-tightening force to eliminate the fit gap between the screw 420 and the moving member 430, thereby improving the pitch-shifting accuracy. The teeth between the screw 420 and the moving member 430 are engaged with the upper surface when the pre-tightening force provided by the stabilizing assembly 700 is a pushing force, and the teeth between the screw 420 and the moving member 430 are engaged with the lower surface when the pre-tightening force provided by the elastic force is a pulling force.

Additionally, in one embodiment, the blade 600 includes a handle 610 and a blade 620, the blade 600 being rotatably disposed on the hub 200 with one end of the handle 610 extending radially outward of the hub 200, the blade 620 being fixedly coupled to one end of the handle 610 with the blade 620 being spaced from the peripheral wall of the hub 200 to expose a portion of the handle 610, wherein one end of the pitch drive assembly 500 is coupled to the exposed portion of the handle 610.

Specifically, referring to fig. 1 and 3, the hub 610 is a shaft-like member that includes a hidden section that is inserted into the hub 200 and rotates about its central axis (i.e., the pitch axis of the blade 600) and an exposed section that protrudes radially outward of the hub 200 to be exposed. The paddle blades 620 are fixedly mounted to the exposed section and are spaced from the outer peripheral wall of the hub 200 such that at least a portion of the exposed section remains exposed. The pitch drive assembly 500 is radially outward of the hub 200, with one end connected to the pitch push plate 300 and the other end connected to the exposed section.

It can be seen that pitch drive assembly 500 is disposed outside of hub 200, and pitch drive assembly 500 is not limited by the internal dimensions of hub 200, as compared to when pitch drive assembly 500 is mounted within hub 200, thereby achieving higher structural strength through a larger dimension.

In one embodiment, pitch drive assembly 500 includes a pitch link and a pitch pin 550, one end of the pitch link is hinged to pitch push plate 300, the other end of the pitch link is hinged to one end of pitch pin 550, the other end of pitch pin 550 is fixedly connected to blade 600 for rotation about the pitch axis of blade 600, and the length of the pitch link is adjustable.

Specifically, the pitch pins 550 extend in the radial direction of the blade handle so as to protrude from the circumferential side wall of the blade 600, so that the pitch pins 550 can swing around the pitch axis of the blade 600. It is worth mentioning that the pitch pins 550 may be fixed at the circumferential side wall of the paddle handle 610 when the pitch drive assembly 500 is located outside the hub 200.

The pitch link extends substantially along the axial direction of the hub 200, and one end of the pitch link is hinged to the pitch-variable push disc 300 above the hub 200, and the other end of the pitch link is hinged to the pitch-variable pin 550 on the radial side of the hub 200, so that the pitch-variable push disc 300, the pitch link and the pitch-variable pin 550 together form a crank link structure, linear movement of the pitch-variable push disc 300 can be transmitted to the pitch-variable pin 550, and the pitch-variable pin 550 drives the blade 600 to swing, thereby realizing adjustment of the attack angle of the blade 600.

After the blade 600 is mounted to the hub 200, fine adjustment of the mounting angle of the blade 600 may be achieved by adjusting the length of the pitch links or pitch pins 550. In this embodiment, the length of the pitch link is adjustable, so that fine adjustment of the attack angle of the blade 600 can be achieved by adjusting the length of the pitch link in this embodiment after the blade 600 is mounted to the hub 200.

It is easy to understand that, since the length of the pitch link is longer than the length of the pitch pin 550 and most of the pitch link is exposed to the outside compared to the pitch pin 550, it is convenient for maintenance personnel to implement a pitch adjustment operation on the pitch link, thereby achieving fine adjustment of the installation angle.

Alternatively, the pitch drive assembly 500 includes a fixed segment 510 that is open at both axial ends, a first movable segment 520, a second movable segment 530, and a pitch adjustment structure 540. The fixed section 510 defines a receiving cavity therein communicating with both openings, a portion of the first moving section 520 extends into the receiving cavity from an opening at one end of the fixed section 510 and is movable in an axial direction of the fixed section 510, a portion of the second moving section 530 extends into the receiving cavity from an opening at the other end of the fixed section 510 and is movable in an axial direction of the fixed section 510, at least a portion of the distance adjusting structure 540 is disposed in the receiving cavity and is connected with the first moving section 520 and the first moving section 520, respectively, to adjust a space between the first moving section 520 and the second moving section 530, and a locking member (not shown) is engaged with the fixed section 510 and the distance adjusting structure 540, respectively, to lock the distance adjusting structure 540.

Specifically, referring to fig. 10 and 11, the pitch link is generally composed of three parts, a fixed segment 510, a first moving segment 520, and a second moving segment 530. The fixed section 510 is generally configured as a hollow tubular structure, both ends of which have openings, so that a portion of the first moving section 520 extends into the fixed section 510 from an opening at one axial end of the fixed section 510, a portion of the second moving section 530 extends into the fixed section 510 from the other axial end of the fixed section 510, and the first moving section 520 and the second moving section 530 can move along the axial direction of the fixed section 510 in the fixed section 510, so that the lengths of the portions of the first moving section 520 and the second moving section 530 exposed out of the fixed section 510 are adjustable, and the overall lengths of the fixed section 510, the first moving section 520 and the second moving section 530 are adjustable, that is, the length of the variable-pitch link is adjustable in the axial direction of the fixed section 510.

Note that the cross-sectional shape of the fixing section 510 may be circular, polygonal, or the like, which is not limited in this embodiment. In addition, in order to prevent the first moving section 520 and the second moving section 530 from being separated from the fixed section 510 during movement, the first moving section 520 and the second moving section 530 are both of a variable diameter structure, the outer diameter of the portion of the first moving section 520 or the second moving section 530 located in the fixed section 510 is larger than the outer diameter of the portion of the first moving section 520 or the second moving section 530 located outside the fixed section 510, and the aperture of the openings at the two ends in the axial direction of the fixed section 510 is matched with the outer diameter of the portion of the first moving section 520 or the second moving section 530 located outside the fixed section 510 and smaller than the outer diameter of the portion of the first moving section 520 or the second moving section 530 located inside the fixed section 510. In an example, referring to fig. 11, a portion of the first moving section 520 or the second moving section 530 located inside the fixed section 510 is screwed with a portion located outside the fixed section 510.

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

The distance adjustment structure 540 may include a knob and a cam fixedly coupled to each other, the cam rotatably disposed within the receiving cavity, and the knob located outside the fixed segment 510, the cam being forced to rotate by rotating the knob. And the first moving section 520 and the second moving section 530 are respectively located at opposite sides of the cam and are both abutted against the cam surface. At this time, as the cam rotates, the first moving section 520 and the second moving section 530 slide with respect to the cam at the cam surface, thereby changing the interval between the first moving section 520 and the second moving section 530.

Or in an embodiment, the distance adjusting structure 540 includes a knob portion 541 and a mating portion 542. The knob portion 541 is rotatably disposed on the outer peripheral wall of the fixed section 510, the mating portion 542 is disposed in the accommodating cavity and fixedly connected to the knob portion 541, and a side end surface of the mating portion 542 facing away from the knob portion 541 is provided with a cam groove 5421. Wherein the first moving section 520 includes a first protrusion 524, the first protrusion 524 extends into the cam slot 5421 and slidably engages the cam slot 5421, and the second moving section 530 includes a second protrusion 534, the second protrusion 534 extends into the cam slot 5421 and slidably engages the cam slot 5421.

Specifically, referring to fig. 11 and 12, a mounting hole communicating with the receiving cavity is formed in a sidewall of the fixing section 510, and a rotation column portion of the knob portion 541 extends into the mounting hole, so that the knob portion 541 integrally rotates around a central axis of the mounting hole. The fitting portion 542 is located in the accommodation chamber, and one side end surface of the fitting portion 542 facing the knob portion 541 is fixedly connected with the column portion of the knob portion 541, so that the fitting portion 542 can be forced to rotate around the central axis of the mounting hole when the knob portion 541 is rotated. The engaging portion 542 is provided with a cam groove 5421 on a side end surface thereof remote from the knob portion 541. On the side end surface of the fitting portion 542 remote 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.

The first moving section 520 has a first projection 524 that extends into the cam slot 5421 and is a sliding fit within the cam slot 5421, and similarly the second moving section 530 has a second projection 534 that extends into the cam slot 5421 and is a sliding fit within the cam slot 5421. It should be noted that, the first moving section 520, the mating portion 542 and the second moving section 530 may be sequentially arranged in the axial direction of the fixed section 510, so that the first protruding portion 524 may protrude from the first moving section 520 in the axial direction of the fixed section 510 and extend in a bending direction near the mating portion 542 so as to extend into the cam slot 5421, and the second protruding portion 534 may protrude from the second moving section 530 in the axial direction of the fixed section 510 and extend in a bending direction near the mating portion 542 so as to extend into the cam slot 5421. Alternatively, referring to fig. 12, the first moving section 520 and the second moving section 530 may be spaced apart from each other in the axial direction of the fixed section 510, and the engaging portion 542 is located at a side of the first moving section 520 and the second moving section 530, a portion of a surface of a side wall of the first moving section 520 adjacent to the engaging portion 542 protrudes into the cam groove 5421 to form the first protruding portion 524, and a portion of a surface of a side wall of the second moving section 530 adjacent to the engaging portion 542 protrudes into the cam groove 5421 to form the second protruding portion 534.

Thus, when the maintenance person rotates the fitting portion 542 through the knob portion 541, the cam groove 5421 on the end surface of the fitting portion 542 is also forced to rotate, and since the first moving section 520 and the second moving section 530 are restrained by the fixed section 510, the first projecting portion 524 and the second projecting portion 534 can move only in the axial direction of the fixed section 510, so that the rotation of the cam groove 5421 forces the first projecting portion 524 and the second projecting portion 534 to approach or separate from each other during the sliding of the first projecting portion 524 and the second projecting portion 534 in the cam groove 5421, and finally, the adjustment of the installation angle of the blade 600 is achieved.

Or in another embodiment, the mating portion 542 of the distance adjusting structure 540 is configured 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 engaged with the mating portion 542 at opposite sides of the external gear.

Thus, when the maintenance personnel rotates the matching portion 542 through the knob portion 541, since the first moving section 520 and the second moving section 530 are constrained by the fixed section 510, the first rack portion and the second rack portion can only move along the axial direction of the fixed section 510, and in addition, the first rack portion and the second rack are located at opposite sides of the matching portion 542, the rotation of the matching portion 542 forces the first rack portion and the second rack to move in opposite directions, and further forces the first moving section 520 and the second moving section 530 to approach or separate from each other, and finally, adjustment of the installation angle of the paddle 600 is achieved.

Of course, the distance adjusting structure 540 is not limited to the above embodiment, and may be realized by a rotation motion to linear motion mode such as a screw pair.

The locking member in this embodiment may be configured as a lock pin or the like having a locking state, and after the blade mounting angle adjustment is completed, the locking member is switched to the locking state to lock the knob portion 541, preventing the knob portion 541 from rotating, thereby maintaining the current blade 600 mounting angle. Of course, the locking member may be configured to lock the knob and prevent the knob from rotating, which is not limited in this embodiment.

Alternatively, the torque transmission assembly 500 further includes a rotating member 560, a link body 580, and a locking member 570, wherein the rotating member 560 is rotatably connected to the circumferential side wall of the torque plate 300, and the rotation axis of the rotating member 560 extends in the radial direction of the torque plate 300. One end of the link body 580 is rotatably connected to a side wall of the rotating member 560 facing away from the variable-pitch push plate 300, a rotation axis between one end of the link body 580 and the rotating member 560 and a rotation axis of the rotating member 560 are parallel to each other and spaced apart from each other, and the other end of the link body 580 is hinged to one end of the variable-pitch pin 550. The locking member 570 cooperates with the rotating member 560 and the variable pitch drive 300, respectively, to lock the rotating member 560 and the variable pitch drive 300.

Specifically, referring to fig. 13, the rotating member 560 may be configured in a cylindrical shape, and the rotating member 560 and the link body 580 are sequentially arranged in a direction from a radially inner side to a radially outer side of the pitch horn 300, the rotating member 560 rotating relative to the pitch horn 300 about a central axis thereof (substantially parallel to the radial direction of the pitch horn 300). And one end of the link body 580 is rotatably connected to an end surface of a side of the rotating member 560 facing away from the variable-pitch push disc 300, and a rotation axis between the one end of the link body 580 and the rotating member 560 and a rotation axis of the rotating member 560 are parallel to each other and spaced apart from each other, so that the link body 580 is eccentrically disposed compared with the rotating member 560. Thus, as the rotating member 560 rotates, the distance between one end of the link body 580 and the plane of the pitch-varying push plate 300 changes, that is, the distance between the hinge axis between the pitch-varying pin 550 and the other end of the link body 580 and the plane of the pitch-varying push plate 300 changes, and when the distance changes, the pitch-varying pin 550 drives the blade 600 to be forced to swing, thereby changing the installation angle of the blade 600.

In addition, the locking member 570 serves to lock the rotatable member 560 from rotating relative to the torque plate 300. Specifically, the circumferential side wall of the rotating member 560 is configured with threads, and the locking member 570 may be configured as a screw having a threaded portion and a smooth portion in the axial direction of the screw, the threaded portion and the rotating member 560 forming a "worm gear" mating relationship. In this way, the rotation member 560 is locked by the self-locking property of the worm gear, so as to prevent the rotation of the rotation member 560 relative to the variable-pitch pushing disc 300.

Of course, the locking member 570 may be configured as other structures, such as a locking pin, that can lock the rotating member 560 about its rotation axis, and will not be described herein.

It will be appreciated that adjustment of the mounting angle of blade 600 may be performed at the pitch links, which are relatively convenient for maintenance personnel to operate due to their longer length, which is typically exposed. In addition, the adjustment of the installation angle of the blade 600 can be performed at the position of the variable-pitch pushing disc 300, in this embodiment, since the variable-pitch pushing disc 300 is arranged at the top, maintenance personnel are not required to disassemble and assemble the variable-pitch propeller, the variable-pitch propeller also has enough space to be convenient for the maintenance personnel to operate, and the maintenance efficiency and convenience are improved.

In addition, in the actual flight, there is sometimes a case where the loads of the blades 600 are not uniform, and the actual flight direction is deviated due to the non-uniform loads of the blades 600. Thus, in an embodiment, the first moving section 520 further includes a first rod 521, a first elastic layer 523, and a second rod 522 sequentially connected in the axial direction of the fixed section 510, and the first rod 521 and/or the second rod 522 moves in the axial direction of the fixed section 510 within the fixed section 510.

Specifically, referring to fig. 12, the first moving section 520 includes three parts connected in sequence in the axial direction of the fixed section 510, wherein the first rod 521 is connected to the variable-pitch pushing disc 300, at least part of the second rod 522 extends into the fixed section 510 to slidingly engage with the fixed section 510, and the first rod 521 and the second rod 522 are connected by the first elastic layer 523. It should be noted that the first elastic layer 523 may be disposed in the fixed section 510, where a portion of the first rod 521 extends into the fixed section 510, and the second rod 522 is integrally disposed in the fixed section 510, or the first elastic layer 523 may be disposed outside the fixed section 510, where the first rod 521 is disposed outside the fixed section 510, and a portion of the second rod 522 extends into the fixed section 510.

Similarly, the second moving section 530 includes three parts sequentially connected in the axial direction of the fixed section 510, wherein at least part of the third rod 532 extends into the fixed section 510 to slidably fit with the fixed section 510, the fourth rod 531 is connected to the distance-varying 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 may be disposed in the fixed section 510, where a portion of the fourth rod 531 extends into the fixed section 510, and the third rod 532 is integrally disposed in the fixed section 510, or the second elastic layer 533 may be disposed outside the fixed section 510, where a portion of the fourth rod 531 extends into the fixed section 510, and the fourth rod 531 is disposed outside the fixed section 510.

Of course, the first elastic layer 523 and the second elastic layer 533 may be disposed simultaneously, which is not described herein.

In this way, when the load of the blade 600 is inconsistent due to the transitional mode conversion of the tiltrotor, the load is transferred to the pitch link, the first elastic layer 523 and/or the second elastic layer 533 can elastically deform, so that the pitch angle of the blade 600 starts to change towards the direction of aerodynamic unloading, and the adaptive adjustment of the pitch angle is achieved, thereby improving the uneven load condition of the hub 200 and the pitch-changing push plate 300.

It should be noted that the materials of the first elastic layer 523 and the second elastic layer 533 include, but are not limited to, rubber, elastomer, and the like.

In addition, referring to fig. 12, in an embodiment, the second rod 522 may have the first protrusion 524, and the third rod 532 may have the second protrusion 534, that is, 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 the elastic material (the first elastic layer 523 or the second elastic layer 533).

As before, in this embodiment, after the space in the hub 200 is reserved by the top of the pitch-changing push disc 300, in this embodiment, the pitch-changing propeller further includes at least two angle sensors, where the at least two angle sensors correspond to the at least two blades 600 one by one, and the angle sensors are disposed at the portions of the blades 600 extending into the hub 200. In this way, the angle of attack of each blade 600 can be directly collected by the angle sensor, and the accuracy of angle measurement is improved.

In addition, in order to achieve the aim, the invention also provides a thrust assembly which comprises the variable-pitch propeller and an electric engine, wherein the electric engine is connected with a hub of the variable-pitch propeller.

The specific structure of the variable pitch propeller refers to the above embodiments, and because the thrust component adopts all the technical solutions of all the embodiments, the variable pitch propeller has at least all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein. In addition, the present invention may also increase the torque density of the thrust assembly due to the reduced weight.

In addition, the invention also provides an aircraft, which comprises an aircraft body and at least one thrust assembly, wherein the thrust assembly is arranged on the aircraft body.

The specific structure of the thrust assembly refers to the above embodiments, and because the aircraft adopts all the technical solutions of all the embodiments, the thrust assembly at least has all the beneficial effects brought by the technical solutions of the embodiments, and the detailed description is omitted herein. In addition, the present invention may also increase the torque density of the thrust assembly due to the reduced weight.

Wherein the aircraft may be an unmanned aerial vehicle or an electric vertical takeoff and landing aircraft eVTOL.

The foregoing is merely exemplary embodiments of the present invention and are not intended to limit the scope of the present invention, and all equivalent structural changes made by the present specification and drawings or direct/indirect application in other related technical fields are included in the scope of the present invention under the technical concept of the present invention.

Claims

1. A variable pitch propeller, comprising:

a hub adapted to be connected with an outer rotor of an electric motor;

the fixed end of the linear driving assembly is arranged in the hub, and the output end of the linear driving assembly extends out of the hub along the direction away from the motor;

the variable-pitch pushing disc is positioned on one side of the hub, which is away from the motor, and is connected with the output end so as to reciprocate along the axial direction of the hub under the driving of the linear driving assembly;

At least two variable-pitch transmission assemblies, at least two variable-pitch transmission assemblies are in one-to-one correspondence with at least two paddles, the variable-pitch transmission assemblies are positioned at the radial outer sides of the hubs and are respectively connected with the variable-pitch pushing disc and the paddles so that the variable-pitch pushing disc drives the paddles to swing through the variable-pitch transmission assemblies, and

The at least two stabilizing assemblies are suitable for extending and contracting along the axial direction of the hub, one end of each stabilizing assembly is hinged to the variable-pitch pushing disc, the other end of each stabilizing assembly is hinged to the hub, and the at least two stabilizing assemblies are arranged along the circumferential direction of the variable-pitch pushing disc.

2. The variable pitch propeller of claim 1 wherein one end of said stabilizing assembly is hinged to the outer edge of said variable pitch thrust plate;

at least two stabilizing components are uniformly arranged at intervals along the circumferential direction of the variable-pitch pushing disc.

3. The variable pitch propeller of claim 2, wherein the blades are uniformly spaced along the circumferential direction of the hub, and the number of the stabilizing assemblies is identical to the number of the blades and corresponds to each other one by one.

4. A variable pitch propeller according to claim 3, wherein the stabilizing assemblies and the variable pitch drive assemblies alternate with each other in the circumferential direction of the variable pitch thrust plate.

5. The variable pitch propeller of claim 4 wherein said stabilizing assembly comprises:

6. The variable pitch propeller of claim 5 wherein the projection of the first connecting arm and the projection of the second connecting arm are radially outward of the variable pitch pushing disc on a plane in which the variable pitch pushing disc lies.

7. The variable pitch propeller of claim 6 wherein 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.

8. The variable pitch propeller of claim 1, wherein the linear drive assembly comprises:

The variable-pitch motor is arranged in the hub, and the variable-pitch motor is configured to be the fixed end;

A screw rod extending along the axial direction of the hub, one end of the screw rod being connected with the output shaft of the variable-pitch motor in the hub, and the other end of the screw rod extending to the outside of the hub along the direction deviating from the motor engine, and

A moving member threadedly coupled to a portion of the lead screw extending outside the hub to configure the output end, and

The telescopic piece, the one end of telescopic piece with the body coupling of displacement motor, the other end of telescopic piece with the moving part is connected, just the telescopic piece is suitable for along the axial of oar hub stretches out and draws back.

9. The variable pitch propeller of claim 4 wherein said blades comprise:

a paddle fixedly connected to one end of the paddle handle, the paddle being spaced from the peripheral wall of the hub to expose a portion of the paddle handle;

10. The pitch propeller of claim 1 wherein the pitch drive assembly comprises a pitch link and a pitch pin, one end of the pitch link being hinged to the pitch push plate, the other end of the pitch link being hinged to one end of the pitch pin, the other end of the pitch pin being fixedly connected to the blade for rotation about the pitch axis of the blade;

wherein, the length of the variable-pitch connecting rod is adjustable.

11. The variable pitch propeller of claim 10, wherein the variable pitch link comprises:

a fixing section with two open ends in the axial direction, wherein an accommodating cavity communicated with both openings is defined in the fixing section;

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

A second moving section, part of which extends into the accommodating cavity from the opening at the other end of the fixed section and can move along the axial direction of the fixed section, and

And the locking piece is matched with the fixed section and the distance adjusting structure respectively so as to lock the distance adjusting structure.

12. The variable pitch propeller of claim 11, wherein the pitch structure comprises:

A knob portion rotatably provided to an outer peripheral wall of the fixed section;

Wherein, the first movable section includes first bulge, first bulge stretches into in the cam groove and with the cam groove slidable cooperates, the second movable section includes the second bulge, the second bulge stretches into in the cam groove and with the cam groove slidable cooperates.

13. The variable pitch propeller of claim 11, wherein the first moving section further comprises a first rod, a first elastic layer, and a second rod connected in sequence along an axial direction of the fixed section, the first rod and/or the second rod moving within the fixed section along the axial direction of the fixed section, and/or

The second moving section further comprises a third rod body, a second elastic layer and a fourth rod body which are sequentially connected along the axial direction of the fixed section, and the third rod body and/or the fourth rod body moves along the axial direction of the fixed section in the fixed section.

14. The variable pitch propeller of claim 1 further comprising at least two angle sensors, at least two of said angle sensors being in one-to-one correspondence with at least two of said blades, and said angle sensors being disposed in portions of said blades extending into said hub.

15. A thrust assembly, comprising:

the variable pitch propeller of any one of claims 1 to 14, and

And the outer rotor of the motor is connected with the hub of the variable-pitch propeller.

16. An aircraft, characterized in that, the aircraft comprises:

aircraft body, and

At least one thrust assembly as claimed in claim 15, said thrust assembly being provided to said aircraft body.

17. The aircraft of claim 16, wherein the aircraft is an electric vertical takeoff and landing aircraft.