Rotor assembly and unmanned aerial vehicle

Abstract

A rotor assembly and an unmanned aerial vehicle. The rotor assembly comprises a propeller (2) and a driving member (3) for driving the propeller to rotate, the propeller being mounted on an output shaft of the driving member by means of a propeller clamp assembly (5). A guide gap (10) is provided between the propeller clamp assembly and a housing (30) of the driving member, a cutting member (4) is provided in the guide gap, and the cutting member is used for cutting off wire-like articles wound within the guide gap.

Description

Rotor assembly and unmanned aerial vehicle TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of unmanned aerial vehicles, in particular, to a rotor assembly and unmanned aerial vehicle. BACKGROUND

[0002] During flight, the unmanned aerial vehicle usually uses an internal sensor to identify and avoid kites and other objects to prevent the unmanned aerial vehicle from being damaged by the winding of the line. However, the kite line is usually thin and semi-transparent, and the sensor may not be able to identify it, so it is not possible to effectively avoid the unmanned aerial vehicle from being damaged by the winding of the line. SUMMARY

[0003] The purpose of the present disclosure is to provide a rotor assembly and unmanned aerial vehicle that can effectively solve the problem of damage caused by the winding of the line.

[0004] In order to achieve the above-mentioned purpose, the present disclosure provides a rotor assembly, which comprises a propeller and a driving member for driving the rotation of the propeller, the propeller being mounted on the output shaft of the driving member through a propeller clamp assembly, wherein a guide gap is provided between the propeller clamp assembly and the housing of the driving member, and a cutting member is provided in the guide gap, the cutting member being used to cut the line object wound in the guide gap.

[0005] In a possible implementation, the propeller clamp assembly comprises an upper propeller clamp and a lower propeller clamp, the center of the propeller being clamped between the upper propeller clamp and the lower propeller clamp, the lower propeller clamp and the housing being arranged in a spaced-apart manner to form the guide gap, and the cutting member being mounted on the surface of the lower propeller clamp facing the housing.

[0006] In a possible implementation, the lower propeller clamp comprises a body portion and a protruding portion provided on the surface of the body portion facing the housing, the projection of the body portion in the axial direction covering the projection of the protruding portion in the axial direction, and the line object being wound on the protruding portion.

[0007] In a possible implementation, a slot is provided on the outer peripheral wall of the protruding portion, and the cutting member is detachably mounted at the slot by means of a fastener.

[0008] In a possible implementation, the cutting member has a fixed end for mounting on the protruding portion and a cutting end away from the fixed end, the cutting end extending out of the slot and the projection of the cutting end in the axial direction being covered by the projection of the body portion in the axial direction.

[0009] In an embodiment, the outer peripheral wall of the protruding portion has a first side wall and a second side wall which are at an angle to each other, the bottom surface of the body portion, the first side wall and the second side wall together define the slot, and the cutting member is a blade which is attached to the first side wall and extends beyond the first side wall.

[0010] In an embodiment, the cutting edge of the blade is an arc-shaped cutting edge which gradually decreases in thickness from inside to outside along the radial direction.

[0011] In an embodiment, the first side wall and the second side wall are connected to each other at an angle, and the side edge of the cutting member is located in the clearance groove.

[0012] In an embodiment, the bottom surface of the body portion is provided with a limiting groove, and the upper edge of the cutting member is located in the limiting groove.

[0013] In an embodiment, the propeller includes a plurality of blades which are arranged radially relative to the center, and the peripheral direction of the protruding portion is provided with a plurality of slots which are arranged at intervals, and each of the slots is provided with the cutting member.

[0014] In an embodiment, the driving member is an electric motor, and the housing includes a motor base, a motor stator housing and a motor rotor housing which are coaxially arranged on the motor base, and the motor rotor housing and the blade holder assembly form the guide gap.

[0015] According to a second aspect of the present disclosure, there is provided a UAV, including an arm and the above-mentioned rotor assembly which is arranged on the arm.

[0016] According to the above technical solution, in the rotor assembly provided by the present disclosure, the guide gap is formed between the blade holder assembly and the housing of the driving member, the wound wire-like object can be stably located at the guide gap and cut off by the cutting member at the guide gap, thus realizing the anti-winding function, effectively eliminating the problem of UAV explosion caused by the wound wire-like object, and improving the safety of UAV flight.

[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings are included to provide a further understanding of the present disclosure and constitute a part of the specification, and are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation of the present disclosure. In the drawings:

[0019] FIG. 1 is a structural schematic view of a UAV arm according to an example embodiment of the present disclosure.

[0020] Fig. 2 is a structural schematic diagram of a propeller of a UAV according to an exemplary embodiment of the present disclosure.

[0021] Figs. 3 and 4 are partial enlarged views of a propeller mounting position according to an exemplary embodiment of the present disclosure.

[0022] Figs. 5 and 6 are structural schematic diagrams of a propeller clamp assembly according to an exemplary embodiment of the present disclosure.

[0023] BRIEF DESCRIPTION OF THE DRAWINGS 1- arm; 10- guide gap; 2- propeller; 20- propeller blade; 3- driving member; 30- housing; 301- motor base; 302- motor stator housing; 303- motor rotor housing; 4- cutting member; 40- cutting edge; 5- propeller clamp assembly; 51- upper propeller clamp; 52- lower propeller clamp; 521- body portion; 522- protruding portion; 523- slot; 524- limiting slot; 525- avoiding slot; 6- fastener. DETAILED DESCRIPTION

[0024] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0025] In the present disclosure, the orientation words such as "upper" and "lower" are generally defined in the normal installation of the UAV provided by the present disclosure, "axial" and "radial" are defined with respect to the rotation axis of the propeller, and "inner" and "outer" are defined with respect to the inner and outer contours of the respective components. In addition, in the following description, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0026] The present disclosure provides a rotor assembly, as shown in Figs. 1 and 2, which includes a propeller 2 and a driving member 3 for driving the rotation of the propeller 2, the propeller 2 being mounted on the output shaft of the driving member 3 through a propeller clamp assembly 5, wherein a guide gap 10 is provided between the propeller clamp assembly 5 and the housing 30 of the driving member 3, and a cutting member 4 is provided in the guide gap 10, the cutting member 4 being used to cut the line-like object wound at the guide gap 10. The rotor assembly can be applied to a UAV, an aircraft, etc. During flight, when a line-like object such as a kite string cannot be avoided, the rotating propeller 2 can wind the line-like object at the guide gap 10 and cut the line-like object through the cutting member 4.

[0027] The propeller clamp assembly 5 is used to install the propeller 2 on the output shaft of the driving member 3 to ensure that the propeller 2 is safely and stably connected to the power system of the UAV. In an exemplary embodiment provided in the present disclosure, as shown in FIG. 3, the propeller clamp assembly 5 includes an upper propeller clamp 51 and a lower propeller clamp 52, and the center of the propeller 2 is clamped between the upper propeller clamp 51 and the lower propeller clamp 52. The driving member 3 can be a motor, and the housing 30 includes a motor base 301, a motor stator shell 302 coaxially installed on the motor base 301, and a motor rotor shell 303 coaxially installed on the motor stator shell 302. The lower propeller clamp 52 and the top surface of the motor rotor shell 303 are arranged in a spaced manner and form a guide gap 10. The cutting member 4 can be a cutter, and the cutting edge of the cutter can be arranged outward to cut the line-like object wound in the guide gap 10. In other embodiments, the propeller clamp assembly 5 can only include the lower propeller clamp 52, and the center of the propeller 2 is fixed to the top surface of the lower propeller clamp 52. The driving member 3 can include a housing 30 and an output shaft extending out of the housing 30, and the guide gap 10 is formed between the lower propeller clamp 52 and the housing 30.

[0028] The line-like object herein can be a kite string, fishing line, engineering line, etc., and the line-like object that can be cut off by the cutting member 4 belongs to the protection scope of the present disclosure, and the kite string will be taken as an example for introduction below. Through multiple simulations and tests, the kite string will eventually stabilize at the position of the guide gap 10 after being wound for a period of time, and the principle is similar to that when there is an electric wire between the rotating fan blades, the electric wire will be wound at the position of the center of the electric fan provided with a motor. When winding a new round of kite string, the previously wound kite string will be tightened and cut off at the position of the cutting member 4, thereby realizing the anti-winding function. The cutting member 4 can be fixed at the guide gap 10, and the cutting action is realized by the force of tightening the kite string acting on the cutting member 4. In other embodiments, the cutting member 4 can also be designed to be radially retractable, and the wound kite string is cut off by the movement in the radial direction.

[0029] In the rotor assembly provided in the present disclosure, the guide gap 10 is formed between the propeller clamp assembly 5 and the housing 30 of the driving member 3, the wound line-like object can be stabilized at the guide gap 10, and is cut off by the cutting member 4 at the guide gap 10, thereby realizing the anti-winding function, effectively eliminating the problem of UAV engine explosion caused by the wound line-like object, and improving the safety of UAV flight.

[0030] In the present disclosure, the top surfaces of the lower propeller clamp 52 and the motor rotor shell 303 are arranged in a spaced manner to form the guide gap 10, and the spacing therebetween can be designed according to the size of the cutting member 4, and the cutting member 4 can be installed on the surface of the lower propeller clamp 52 facing the housing 30. In other embodiments, the cutting member 4 can also be installed on the top surface of the housing 30, which is not limited in the present disclosure.

[0031] As shown in FIG. 4, the lower propeller clamp 52 comprises a body part 521 and a protruding part 522 provided on the surface of the body part 521 facing the shell 30, the projection of the body part 521 in the axial direction covers the projection of the protruding part 522 in the axial direction, the top surface of the body part 521 and the shell 30 form a guide gap 10, and the line article is wound on the protruding part 522. The propeller 2 comprises a plurality of blades 20 arranged radially relative to the center, in the embodiment shown in the figure, three blades 20 are provided, the upper propeller clamp 51 and the lower propeller clamp 52 are respectively provided with a plurality of petal parts protruding outward corresponding to the number of blades 20, and the line article can be guided between the adjacent two petal parts. In the process of driving the propeller 2 to rotate, the propeller clamp assembly 5 rotates synchronously, and in the process of rotation, the kite line can be guided to the area between the adjacent two petal parts, so as to wind the kite line on the protruding part 522.

[0032] As to the number of cutting members 4, it can be no less than the number of blades 20, in the embodiment, the number of cutting members 4 is equal to the number of blades 20, the circumferential direction of the protruding part 522 is provided with a plurality of spaced-apart grooves 523, each groove 523 is provided with a cutting member 4, and the cutting member 4 corresponds to the blade 20. In the embodiment shown in the figure, three blades 20 are provided, the protruding part 522 is provided with three grooves 523 spaced apart along the circumferential direction corresponding to the positions of the three blades 20, and three cutting members 4 are correspondingly provided, which can be designed according to the needs, and the kite line wound on the protruding part 522 can be cut at the same time to ensure smooth cutting and improve the reliability of the anti-winding function of the unmanned aerial vehicle.

[0033] As shown in FIGS. 5 and 6, the outer peripheral wall of the protruding part 522 is provided with a groove 523, and the cutting member 4 is detachably installed at the groove 523 through a fastener 6. The cutting member 4 is installed on the lower propeller clamp 52 in a replaceable manner, and after a long time of use, the cutting member 4 can be replaced with a new and sharp one to ensure smooth cutting of the kite line. In other embodiments, the cutting member 4 can also be installed at the groove 523 in a clamping, plugging, threaded connection or other manner.

[0034] As shown in FIG. 5, the cutting member 4 has a fixed end for installation on the protruding part 522 and a cutting end away from the fixed end, the cutting end extends out of the groove 523, and the projection of the body part 521 in the axial direction covers the projection of the cutting end in the axial direction. In this way, the cutting end of the cutting member 4 extends out of the groove 523 to ensure smooth completion of the cutting action, the cutting end does not extend to the outside of the body part 521 and will not exceed the body part 521, and can be hidden inside the propeller clamp without hurting the user to ensure the safety of the unmanned aerial vehicle.

[0035] The slot 523 can have various forms. In the present disclosure, as shown in FIG. 6, the outer peripheral wall of the protruding portion 522 has a first side wall and a second side wall that are at an included angle, and the bottom surface of the body portion 521, the first side wall and the second side wall jointly enclose the slot 523. The cutting member 4 can be a blade that is attached to the first side wall. The blade extends beyond the first side wall. In the embodiment shown in the figure, the cutting member 4 is vertically arranged. By being attached to the first side wall, the contact area with the first side wall can be increased, and the reliability and stability of the connection can be ensured. At the same time, the width direction of the blade is the axial direction, and the multiple turns of the kite line wound in the circumferential direction can be simultaneously cut. The blade does not need to be designed to be very thick, and is more compact and convenient. In other embodiments, the cutting member 4 can also be horizontally arranged. At this time, the thickness of the blade can be increased to ensure the cutting action on the wound kite line. The above embodiments all belong to the protection scope of the present disclosure.

[0036] As shown in FIG. 6, the connection between the first side wall and the second side wall is provided with an avoiding groove 525 extending in the axial direction, and the side edge of the cutting member 4 is located in the avoiding groove 525. The bottom surface of the body portion 521 is provided with a limiting groove 524, and the upper edge of the cutting member 4 is located in the limiting groove 524. By designing the structure of the slot 523, the cutting member 4 can be stably and reliably installed on the lower paddle clamp 52. The avoiding groove 525 and the limiting groove 524 can play a certain pre-positioning role on the cutting member 4, and the operation difficulty during the installation of the fastener 6 can be reduced. In other embodiments, the slot 523 can be a slot with an open outer end, and one end of the cutting member 4 is inserted into the slot.

[0037] The blade of the blade can be an arc-shaped blade with a thickness gradually decreasing from the inside to the outside in the radial direction. In this way, the cutting end of the blade is more sharp, and by designing the structure of the blade, the arc-shaped blade can quickly cut the kite line wound on the protruding portion 522. In other embodiments, the cutting member 4 can also be scissors and the like.

[0038] In the rotor assembly provided in the present disclosure, by designing the paddle clamp assembly 5 and the paddle 20, the wound kite line is stably positioned at the position of the guide gap 10. By arranging multiple cutting members 4 in the circumferential direction of the lower paddle clamp 52, the multiple cutting members 4 are respectively and stably installed at the corresponding slots 523, and the kite line wound on the protruding portion 522 can be timely cut, the anti-winding function is realized, and the phenomenon of unmanned aerial vehicle explosion is avoided. At the same time, the multiple cutting members 4 are hidden inside the lower paddle clamp 52 and the housing 30 at the positions of the slots 523, and do not extend out of the guide gap 10, so as not to cut the user, and are more safe and reliable.

[0039] According to a second aspect of the present disclosure, there is provided a UAV, comprising an arm 1 and a rotor assembly mounted on the arm 1, the rotor assembly being the rotor assembly as described above, the UAV having all the beneficial effects of the rotor assembly as described above, which will not be repeated here.

[0040] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details of the above-described embodiments. Various simple modifications can be made to the technical solutions of the present disclosure within the technical concept of the present disclosure, and all these simple modifications shall fall within the protection scope of the present disclosure.

[0041] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not describe various possible combinations again.

[0042] In addition, various different embodiments of the present disclosure can also be combined in any appropriate manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A rotor assembly, characterized by, The propeller is mounted on an output shaft of a driving member for driving the propeller to rotate, and a propeller clamp assembly is arranged between the propeller and the driving member.

2. The rotor assembly of claim 1, wherein, The propeller clamp assembly comprises an upper propeller clamp and a lower propeller clamp, and the center of the propeller is clamped between the upper propeller clamp and the lower propeller clamp.

3. The rotor assembly of claim 2, wherein, The lower propeller clamp comprises a body portion and a protruding portion arranged on a surface of the body portion facing the housing, and the projection of the body portion in the axial direction covers the projection of the protruding portion in the axial direction.

4. The rotor assembly of claim 3, wherein, The outer peripheral wall of the protruding portion is provided with a slot, and the cutting member is detachably mounted at the slot by a fastener.

5. The rotor assembly of claim 4, wherein, The cutting member has a fixed end for mounting on the protruding portion and a cutting end away from the fixed end, and the cutting end extends out of the slot and the projection of the body portion in the axial direction covers the projection of the cutting end in the axial direction.

6. The rotor assembly of claim 5, wherein, The outer peripheral wall of the protruding portion has a first side wall and a second side wall intersecting at an angle, and the bottom surface of the body portion, the first side wall and the second side wall together form the slot.

7. The rotor assembly of claim 6, wherein, The connecting portion of the first side wall and the second side wall is provided with an avoidance slot extending in the axial direction, and the side edge of the cutting member is located in the avoidance slot.

8. The rotor assembly of claim 6, wherein, The bottom surface of the body portion is provided with a limiting slot, and the upper edge of the cutting member is located in the limiting slot.

9. The rotor assembly of claim 6, wherein, The cutting edge of the blade is an arc-shaped cutting edge with gradually decreasing thickness from inside to outside in the radial direction.

10. The rotor assembly of any one of claims 4-9, wherein, The propeller comprises a plurality of blades arranged radially relative to the center, and the circumferential direction of the protruding portion is provided with a plurality of spaced apart slots, and each slot is provided with a cutting member.

11. The rotor assembly of claim 1, wherein, The driving member is a motor, and the housing comprises a motor base and a motor stator housing and a motor rotor housing coaxially mounted on the motor base, and the motor rotor housing and the propeller clamp assembly form the guide gap.

12. A drone, characterized in that, The propeller clamp assembly comprises an upper propeller clamp and a lower propeller clamp, and the center of the propeller is clamped between the upper propeller clamp and the lower propeller clamp. The lower propeller clamp comprises a body portion and a protruding portion arranged on a surface of the body portion facing the housing, and the projection of the body portion in the axial direction covers the projection of the protruding portion in the axial direction. The outer peripheral wall of the protruding portion is provided with a slot, and the cutting member is detachably mounted at the slot by a fastener. The cutting member has a fixed end for mounting on the protruding portion and a cutting end away from the fixed end, and the cutting end extends out of the slot and the projection of the body portion in the axial direction covers the projection of the cutting end in the axial direction. The outer peripheral wall of the protruding portion has a first side wall and a second side wall intersecting at an angle, and the bottom surface of the body portion, the first side wall and the second side wall together form the slot. The connecting portion of the first side wall and the second side wall is provided with an avoidance slot extending in the axial direction, and the side edge of the cutting member is located in the avoidance slot. The bottom surface of the body portion is provided with a limiting slot, and the upper edge of the cutting member is located in the limiting slot. The cutting edge of the blade is an arc-shaped cutting edge with gradually decreasing thickness from inside to outside in the radial direction. The propeller comprises a plurality of blades arranged radially relative to the center, and the circumferential direction of the protruding portion is provided with a plurality of spaced apart slots, and each slot is provided with a cutting member. The driving member is a motor, and the housing comprises a motor base and a motor stator housing and a motor rotor housing coaxially mounted on the motor base, and the motor rotor housing and the propeller clamp assembly form the guide gap. The propeller clamp assembly comprises an upper propeller clamp and a lower propeller clamp, and the center of the propeller is clamped between the upper propeller clamp and the lower propeller clamp. The lower propeller clamp comprises a body portion and a protruding portion arranged on a surface of the body portion facing the housing, and the projection of the body portion in the axial direction covers the projection of the protruding portion in the axial direction.

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