CN110972473A

CN110972473A - Protective housing, power device and unmanned aerial vehicle

Info

Publication number: CN110972473A
Application number: CN201880041694.XA
Authority: CN
Inventors: 王建伟; 吴晓龙; 卢绰莹
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2018-11-20
Filing date: 2018-12-19
Publication date: 2020-04-07

Abstract

The invention discloses a protective shell, a power device and an unmanned aerial vehicle, wherein the protective shell (400) is used for protecting a motor (200) of the unmanned aerial vehicle, and the protective shell (400) comprises: a protector (410) for covering the upper end surface of the motor (200); the fixing part (420) is arranged on the protection piece (410) and is detachably connected with the motor (200); the shaft hole (430) is formed in the protection piece (410) and is used for being matched with the driving shaft (211) of the motor (200); the penetrating part (440) is arranged on the protection piece (410) and used for allowing the locking piece (600) to penetrate through so as to fix the propeller (300) and the motor (200) of the unmanned aerial vehicle (100); and a plurality of heat dissipation teeth (450), wherein the heat dissipation teeth (450) are arranged on one side of the protection piece (410) at intervals and extend from one side of the protection piece (410) to the upper end surface of the motor (200). The protective shell provided by the invention is convenient to disassemble and assemble, can facilitate the cleaning of the interior of the motor, prolongs the service life of the motor and improves the working reliability.

Description

Protective housing, power device and unmanned aerial vehicle

Technical Field

The invention relates to the field of motor protection shells, in particular to a protection shell, a power device and an unmanned aerial vehicle.

Background

At present, the power of mechanical motion equipment such as an unmanned aerial vehicle is realized by a mode of driving a propeller by a motor. The motor generally includes a motor main body and an output shaft for connecting with the propeller, and an upper surface of the motor main body (i.e., an end surface of the motor main body facing the propeller) is generally an open structure having an opening through which heat generated when the motor operates is radiated to the air, thereby achieving heat dissipation. And plant protection unmanned aerial vehicle's operational environment is comparatively abominable, when field or field operation, debris such as particulate matter, liquid get into the motor inside from motor main part upper surface easily, therefore the motor often need wash just can continue to use. And the protective housing and the motor external rotor integrated into one piece of traditional motor, the user wants to wash motor inside must dismantle the motor is whole get off, washs again, and not only inefficiency influences user's use moreover and experiences.

Disclosure of Invention

The invention provides a protective shell, a power device and an unmanned aerial vehicle, and aims to facilitate motor cleaning, prolong the service life of a motor and improve the working reliability.

A protective case for protecting a motor of a drone, the protective case comprising:

a protector for covering an upper end surface of the motor;

the fixing part is arranged on the protection piece and is used for being detachably connected with the motor;

the shaft hole is formed in the protection piece and is used for being matched with a driving shaft of the motor;

the penetrating part is arranged on the protection piece and used for allowing the locking piece to penetrate through so as to fix the propeller and the motor of the unmanned aerial vehicle; and

the heat dissipation teeth are arranged on one side of the protection piece at intervals and extend from one side of the protection piece to the upper end face of the motor.

In the protective housing of the present invention, the fixing portion is a hole structure for a connecting member to pass through, so that the fixing portion can be mounted on or dismounted from the motor.

In the protective case of the present invention, the number of the fixing portions is plural, and the plural fixing portions are provided at intervals in the circumferential direction of the protector.

In the protective case of the present invention, the fixing portion is a screw through hole or a snap structure.

In the protective case of the present invention, the shaft hole is surrounded by the protector.

In the protective shell, the penetrating parts are two penetrating holes symmetrically arranged on two sides of the shaft hole, and the centers of the two penetrating holes and the center of the shaft hole are on the same straight line.

In the protective case of the present invention, the heat radiation teeth are arranged radially in the radial direction of the protector.

In the protective shell of the invention, the heat dissipation teeth are linearly extended.

In the protective shell of the invention, the heat dissipation teeth are arranged in a bent extending manner.

In the protective case of the present invention, the heat radiating tooth includes a heat radiating tooth body and an inclined portion connected to the heat radiating tooth body, the inclined portion having an inclined surface extending outward from an end near the middle portion of the protector in such a manner that a distance from the protector gradually increases.

In the protective case of the present invention, the protector includes:

the covering part is used for covering the upper end face of the motor, and the shaft hole is formed in the covering part;

the guide part extends outwards from the periphery of the covering part and is used for guiding the moisture or the solid on the surface of the covering part to the side part of the motor.

In the protective shell of the invention, an included angle between the covering part and the guide part is an obtuse angle.

The power device comprises a propeller, a motor and the protective shell, wherein the motor is detachably connected with the protective shell, and the propeller is arranged on the motor and the protective shell.

The utility model provides an unmanned aerial vehicle, includes fuselage, horn and as above power device, power device set up in horn one end is used for doing unmanned aerial vehicle provides flight power.

The embodiment of the invention provides a protective shell, a power device and an unmanned aerial vehicle. When the user needs to wash or overhaul the inside of the motor, the protective shell can be quickly detached from the motor, so that convenience is brought to the user to wash or overhaul the inside of the motor, the washing or overhauling efficiency of the motor is improved, and the use experience of the user can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an unmanned aerial vehicle according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the power plant of FIG. 1;

FIG. 3 is an exploded schematic view of the power plant of FIG. 2;

FIG. 4 is a schematic cross-sectional view of a portion of the components of the power plant of FIG. 2 showing the protective housing and the rotor housing and drive shaft of the motor;

FIG. 5 is an angled view of the protective housing of FIG. 2;

FIG. 6 is a schematic view of the protective shell of FIG. 2 at another angle;

FIG. 7 is a schematic cross-sectional view of the protective shell of FIG. 5;

fig. 8 is an enlarged partial schematic view at a of fig. 7.

Description of reference numerals:

100. an unmanned aerial vehicle; 110. a body; 120. a horn; 121. a motor mounting seat; 200. a motor; 210. a motor main body; 211. a drive shaft; 220. a rotor case; 221. a first opening; 300. a propeller; 400. a protective shell; 410. a protective member; 411. a covering part; 412. a guide part; 420. a fixed part; 430. a shaft hole;

440. a penetration part; 450. a heat dissipating tooth; 451. a heat dissipating tooth body; 452. an inclined portion; 4521. a bevel; 500. performing crack filling; 600. and a locking member.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

Referring to fig. 1, an unmanned aerial vehicle 100 according to an embodiment of the present invention is used for carrying loads, such as a video camera, a spraying device, a water tank, a medicine box, a seeding box, and a carrier. The drone 100 may be specifically a multi-rotor drone, a fixed wing drone, or an unmanned helicopter, among others. The drone 100 includes a fuselage 110, a horn 120, and a power plant, the horn 120 extending from the fuselage 110.

The power device may be located at any suitable location on the horn 120. For example, the power unit may be provided at an end of the horn 120, or may be provided near an end of the horn 120. In some embodiments, the drone 100 includes at least two arms 120, the at least two arms 120 being disposed symmetrically or asymmetrically about the fuselage 110. Each horn 120 may support one power plant or may support multiple power plants. Each horn 120 may carry a different number of power units or the same number of power units.

In this embodiment, four power devices are provided on one drone 100 and are respectively provided on four arms 120 of the drone 100. It will be appreciated that other suitable numbers, types or arrangements of power plants may be implemented.

Referring to fig. 2 to 4, the power device includes a motor 200, a propeller 300 and a protective casing 400, and the motor 200 is detachably connected to the protective casing 400.

The part of the arm 120 far away from the body 110 is provided with a motor mounting seat 121 for mounting the motor 200. The motor 200 is fixedly arranged on the motor mounting seat 121 and is fixedly connected with the motor mounting seat through a fastener or a clamping piece. The motor 200 is generally a brush motor or a brushless motor, and in this embodiment, the motor is mainly a brushless motor.

In the present embodiment, the number of the motors 200 is four, and four motors 200 are provided in the arm 12, respectively. It will be appreciated that in other embodiments, the number of motors 200 may be provided in any other suitable number, such as one, two, three, five, six, or more, depending on the particular design requirements.

The motor 200 includes a motor body 210 and a rotor case 220 fixed to an upper portion of the motor body 210. The motor main body 210 has a rotor, a stator, and a driving shaft 211, and the driving shaft 211 penetrates the rotor case 220 and is connected to the propeller 300. The rotor can be rotatory around drive shaft 211 under the electromagnetic field effect that the stator circular telegram back produced to drive screw 300 and produce the rotation, thereby drive unmanned aerial vehicle 100 and accomplish operations such as take-off, landing, hover.

It should be noted that the terms of orientation such as up, down, bottom, top, etc. appearing in the description of the embodiment of the present invention refer to the normal operation attitude of the drone 100 after the protection case 400 is mounted on the motor 200 and the motor 200 is mounted on the drone 100, and should not be considered as limiting.

During operation, motor 200 generates a large amount of heat. In order to improve the working efficiency and the working stability of the motor 200, it is necessary to rapidly dissipate heat generated from the motor 200. The heat generated by the motor 200 may be dissipated in at least two ways:

the first heat dissipation mode: the rotor case 220 and the motor main body 210 form a heat radiation structure, and heat exchange, heat radiation, and the like are performed through the case of the motor main body 210 and the rotor case 220.

In a second heat dissipation manner, the rotor case 220 and the motor main body 210 form a heat dissipation channel, and the air inside the motor main body 210 can exchange heat with the outside air through the heat dissipation channel, so as to dissipate heat.

It should be noted that the heat dissipation manner inside the motor 200 is not limited to the above two manners, and any manner capable of dissipating the heat generated by the operation of the motor 200 should be within the protection scope of the present embodiment.

Propeller 300 is located on a side of motor 200 facing away from motor mount 121. The propeller 300 may be a positive or negative propeller. The positive pitch is a propeller that rotates counterclockwise to generate lift when viewed from the tail of the motor 200 to the head of the motor 200. The counter-blade is a propeller that rotates clockwise when viewed from the tail of the motor 200 to the head of the motor 200 to generate lift.

The number and the structure of the propellers 300 and the angle relative to the fuselage 110 are not limited, and the unmanned aerial vehicle can be driven to start or stop under the driving of the motor 200. In particular, the number of propellers 300 may be any suitable number, such as one or more (two, three, or more). The propeller 300 may be disposed horizontally, vertically, or at any other angle relative to the fuselage 110.

In this embodiment, the rotor casing 220 is provided with a first opening 221 communicated with the interior of the motor main body 210, and the bottom of the motor main body 210 is provided with a second opening (not shown) communicated with the interior of the motor main body 210. During the operation of the motor main body 210, the external air flows into the motor main body 210 from the first opening 221 and exchanges heat with the motor main body 210, and the air inside the motor main body 210 can be discharged outwards from the second opening to reduce the temperature of the motor main body 210 during the operation, so that the motor main body 210 is in a proper working temperature range, and the heat exchange efficiency is high.

In other embodiments, the first opening 221 and the second opening may be disposed at any suitable positions of the rotor case 220 or the motor main body 210 according to actual requirements. When the first opening 221 is used as an air inlet, that is, when the external air enters the motor main body 210 through the first opening 221, the second opening is correspondingly used as an air outlet; when the first opening 221 is used as an exhaust port, i.e., the gas in the motor main body 210 is exhausted through the first opening 221, the second opening is correspondingly used as an intake port.

Referring to fig. 5 to 8, the protective shell 400 includes a protection member 410, a fixing portion 420, a shaft hole 430, a penetrating portion 440, and a plurality of heat dissipation teeth 450.

Referring to fig. 2 and 3 again, the protecting member 410 is located above the rotor casing 220 and covers the first opening 221, and can be detachably connected to the motor 200. During normal operation of the drone, moisture and solids, such as liquid, dust, and suspended solid particles, above the motor 200 will be blocked by the protection member 410, preventing the moisture and solids from entering the interior of the motor body 210 through the first opening 221. Even inside steam and solid entering motor main part 210, when needing to wash motor 200, because protection piece 410 can dismantle with motor 200 and be connected, therefore protective housing 400 also can be dismantled from motor 200 fast, and convenience of customers washs motor 200's inside, can improve motor 200's cleaning efficiency to improve motor 200's life has guaranteed the reliability of unmanned aerial vehicle 100 work.

The protection member 410 includes a covering portion 411 and a guiding portion 412, the covering portion 411 covers the first opening 221, and the guiding portion 412 extends outward from the periphery of the covering portion 411 to guide moisture or solids on the upper surface of the covering portion 411 to the side of the motor main body 210, so as to prevent moisture and solids from entering the interior of the motor main body 210 from the first opening 221.

An included angle is formed between the guiding portion 412 and the covering portion 411, and the guiding portion 412 inclines towards the rotor shell 220, and the included angle can be an obtuse angle, an acute angle or a right angle, and can play a certain protection role. In one embodiment, the included angle is an obtuse angle to effectively guide the moisture and solids on the upper surfaces of the guiding portion 412 and the covering portion 411 to the side portion of the motor main body 210, so that the weight of the unmanned aerial vehicle can be kept low when the unmanned aerial vehicle operates in the air, especially in severe environments such as rainstorm or pesticide spraying.

As for the specific shape of the protection member 410, the protection member 410 may be designed to have a substantially circular shape, a substantially oval shape, a substantially square shape, a substantially parallelogram shape, a trapezoidal shape, and other regular or irregular shapes according to actual applications, and may be designed in various sizes according to different applications, as long as it is possible to effectively secure the covering of the first opening 221.

In the present embodiment, the shape of the protector 410 is adapted to the shape of the rotor case 220. Since the motor main body 210 is generally substantially cylindrical, the upper end surface of the rotor case 220 has a substantially circular profile, and in the present embodiment, the protector 410 has a substantially circular profile.

When the protector 410 is substantially circular, the diameter of the protector 410 is equal to the diameter of the upper end surface of the rotor case 220, and may be larger than the upper end surface of the rotor case 220. Specifically, the maximum circumferential dimension of the guide portion 412 is larger than the circumferential dimension of the upper end surface of the rotor casing 220, so as to prevent moisture or solids guided by the guide portion 412 from falling onto the upper end surface of the rotor casing 220. It is understood that in other embodiments, the maximum circumferential dimension of the guide portion 412 may be equal to the circumferential dimension of the upper end surface of the rotor case 220.

Referring to fig. 2 and 3, in the present embodiment, in view of minimizing the influence on the air flow, the maximum circumferential dimension of the guide portion 412 is slightly larger than the circumferential dimension of the upper end surface of the rotor casing 220, and the diameter difference between the protector 410 and the upper end surface of the motor main body 210 is approximately within 1 cm.

The protector 410 is spaced apart from the rotor case 220. That is, there is a gap between the protection member 410 and the rotor casing 220, so that a gap 500 is formed between the protection member 410 and the rotor casing 220, and the gap 500 may allow air to circulate, thereby reducing the temperature of the motor body 210, extending the service life of the motor 200, and improving the operational reliability of the motor 200. External air may enter between the protection member 410 and the motor 200 through the slit 500 and enter the motor body 210 through the first opening 221. It is understood that the air in the motor body 210 can also flow out from the first opening 221 to between the protection member 410 and the motor 200, and is discharged out through the gap 500

The material of the protection member 410 may be a high-strength material such as thermoplastic, thermosetting plastic, or metal. The thermoplastic may be a phenolic, epoxy, or the like. The thermosetting plastic may be polyphenylsulfone (PPS), Polysulfone (PSF), Polyethersulfone (PES), Polyimide (PI), Polyamideimide (PAI), Polyetherimide (PEI), Polyetheretherketone (PEEK), Polybenzimidazole (PBI), and the like. The metal can be aluminum, aluminum magnesium alloy, stainless steel, titanium alloy. It is understood that the protection member 410 is not limited to the above-mentioned material composition, but may be any other suitable material.

The protector 410 is detachably coupled to the rotor case 220, so that the protective case 400 and the motor 200 are conveniently disassembled and assembled. When a user needs to overhaul or maintain the inside of the motor 200, for example, when cleaning, the protective shell 400 can be quickly detached from the motor 200, so that the overhaul efficiency or the maintenance efficiency of the motor 200 can be improved, and the use experience of the user can also be improved.

It is understood that the detachable connection manner is not limited to one, and for example, the protector 410 and the rotor case 220 may be connected by a connector, such as a snap structure or a screw. In the present embodiment, the fixing portion 420 has a hole structure, and a connecting member, such as a screw, is inserted into the hole structure to fix the protection member 410 to the rotor casing 220. When the connecting piece is a screw, the hole structure is a threaded through hole. It is understood that the connector is not limited to the screw, and any other connector that can achieve the detachable connection between the protector 410 and the rotor case 220 is within the scope of the present embodiment.

In other embodiments, the fixing portion 420 may be a snap structure by which the protection member 410 is detachably connected with the rotor case 220. The buckle structure can be designed according to actual needs, for example, the buckle structure is set to include a hook arranged on the protection member 410 and a slot arranged on the rotor housing 220, or other buckle modes, as long as the protection member 410 can be locked and separated from the rotor housing 220.

The number of the fixing portions 420 may be one, or may be plural, for example, two, three, or four. In the present embodiment, the number of the fixing portions 420 is plural, and the plural fixing portions 420 are provided at intervals in the circumferential direction of the protector 410. In order to ensure stable and fixed connection of the protector 410 and the rotor case 220, a plurality of fixing portions 420 are provided at equal intervals in the circumferential direction of the protector 410. It is understood that the arrangement of the fixing portion 420 is not limited to the above arrangement, and any other suitable arrangement may be adopted.

The protector 410 is provided with a shaft hole 430 and a penetration portion 440. Specifically, the shaft hole 430 is formed by enclosing the covering portion 411, that is, the shaft hole 430 is directly formed on the covering portion 411, and the driving shaft 211 of the motor main body 210 is inserted through the shaft hole 430 and connected to the propeller 300.

The power device further comprises a locking member 600, wherein the locking member 600 penetrates through the rotor shell 220, the penetrating portion 440 and the propeller 300 and locks the rotor shell 220, the penetrating portion 440 and the propeller 300. The number of the through-holes 440 is plural, for example, two or more, so long as it is ensured that the propeller 300 can normally and stably work after the motor 200, the protecting member 410 and the propeller 300 are locked by the locking member 600. In the present embodiment, the plurality of penetrating portions 440 and the plurality of fixing portions 420 are provided at intervals in the circumferential direction of the protector 410.

In order to ensure the installation stability of the propeller 300, the through holes 440 are two through holes symmetrically disposed on two sides of the shaft hole 430, and the centers of the two through holes and the center of the shaft hole 430 are on the same straight line, i.e., the center of the shaft hole 430 is located on the connecting line of the centers of the two through holes.

In an embodiment, a plurality of heat dissipating teeth 450 are disposed on a side of the protection member 410 facing the rotor casing 220, and the heat dissipating teeth 450 can enhance mechanical properties of the protection member 410, and can achieve a space arrangement between the protection member 410 and the rotor casing 220 to perform a flow guiding function.

Specifically, the heat dissipation teeth 450 are sequentially spaced along the circumferential direction of the protection member 410, and are radially arranged along the radial direction of the protection member 410, and a fan-shaped heat dissipation area is formed between two adjacent heat dissipation teeth 450, which is the aforementioned crack 500, and thus the overall heat dissipation area of the protection shell 400 can be increased, the heat dissipation radiation space can be increased, and the air circulation effect of the convection air can be increased. When the motor body 210 is operated, the protection member 410 rotates, and the heat dissipation teeth 450 also rotate accordingly. At this time, the heat dissipation teeth 450 can accelerate the air flow speed around the heat dissipation teeth, thereby accelerating the heat dissipation effect generated by the operation of the motor main body 210.

The extension direction of the fan-shaped heat dissipation area formed by the plurality of heat dissipation teeth 450 is substantially perpendicular to the extension direction of the first opening 221. At this time, the flow direction of the air passing through the fan-shaped heat dissipation area is substantially perpendicular to the flow direction of the air passing through the first opening 221.

The heat dissipation teeth 450 may be protruded from the surface of the protector 410, or may be formed by being recessed from the protector 410 toward a side away from the rotor case 220. In one embodiment, the heat dissipation teeth 450 and the protection member 410 may be provided as separate members. It is understood that in other embodiments, the heat dissipating teeth 450 and the protecting member 410 may be integrally formed to enhance the mechanical performance of the protective case 400.

In one embodiment, the heat dissipation teeth 450 linearly extend along the radial direction of the protection member 410, so that the gap 500 formed between the protection member 410 and the rotor shell 220 can be better adapted to the first opening 221, thereby ensuring effective air intake or exhaust and accelerating the heat dissipation effect generated by the operation of the motor body 210.

In another embodiment, the heat dissipating teeth 450 extend in a curved shape along the radial direction of the protector 410 to increase the overall heat dissipating specific surface area of the heat dissipating teeth 450 to a greater extent, thereby achieving a better heat dissipating effect.

It is understood that the heat dissipation teeth 450 are not limited to the above-mentioned arrangement, and may be designed to be substantially S-shaped, or other regular or irregular arrangement according to practical applications.

The heat dissipation tooth 450 includes a heat dissipation tooth body 451 and an inclined portion 452 connected to the heat dissipation tooth body 451. The heat radiating tooth body 451 is formed to extend inward from the periphery of the protector 410. The inclined portion 452 is located at an end of the heat dissipation tooth body 451 facing the shaft hole 430, and is inclined and extends inward from a side of the heat dissipation tooth body 451 facing away from the protector 410 toward the protector 410. Specifically, the inclined portion 452 has an inclined surface 4521, and the inclined surface 4521 extends from one end facing the shaft hole 430 to the heat dissipation tooth body 451 with a gradually increasing distance from the protector 410.

During assembly, the protective housing 400 is placed on the rotor housing 220 of the motor, the driving shaft 211 of the motor 200 is inserted into the shaft hole 430, the locking member 600 is inserted into the rotor housing 220 and the insertion portion 440, and the fixing portion 420 is fastened to or corresponds to the protective housing mounting portion of the rotor housing 220 through the connecting member. Driving shaft 211 is coupled to propeller 300, locker 600 is coupled to propeller 300, and locker 600 locks propeller 300, protector 400 and motor 200. At this time, the rotor case 220 of the motor 200 is located below the protective case 400 (with reference to the time of normal flight of the drone 100), and the protective case 400 covers the first opening 221 of the rotor case 220. The rotor case 220 and the motor main body 210 are assembled, and the power unit is assembled.

The protective housing 400, the power device and the unmanned aerial vehicle 100 provided by the embodiment can be quickly detached from the motor 200 when being cleaned or overhauled, so that convenience is brought to users for cleaning or overhauling the inside of the motor 200, the cleaning or overhauling efficiency of the motor 200 is improved, and the use experience of the users is also improved.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a protective housing for protect unmanned aerial vehicle's motor, its characterized in that, the protective housing includes:

a protector for covering an upper end surface of the motor;

2. The protective case of claim 1, wherein the fixing portion is a hole structure for a connector to pass through so that the fixing portion can be mounted on or dismounted from the motor.

3. The protective case of claim 1, wherein the number of the fixing portions is plural, and the plural fixing portions are provided at intervals in a circumferential direction of the protector.

4. A protective casing according to claim 3 wherein the fixing portion is a threaded through hole or a snap-fit arrangement.

5. The protective case of claim 1, wherein the shaft hole is enclosed by the protective member.

6. The protective shell according to claim 1, wherein the through holes are two through holes symmetrically arranged on two sides of the shaft hole, and centers of the two through holes and the center of the shaft hole are on the same straight line.

7. The protective case of claim 1, wherein the heat dissipating teeth are arranged radially in a radial direction of the protective member.

8. A protective casing according to claim 7 wherein the heat dissipating teeth extend linearly.

9. The protective case of claim 8, wherein the heat dissipating teeth extend in a curved configuration.

10. The protective case of claim 9, wherein the heat dissipating teeth comprise a heat dissipating tooth body and an inclined portion connected to the heat dissipating tooth body, the inclined portion having an inclined surface extending outwardly from an end near the middle of the protective member at a gradually increasing distance from the protective member.

11. The protective case of any one of claims 1 to 10, wherein the protective member comprises:

a guide portion extending outward from a periphery of the covering portion.

12. The protective case of claim 11, wherein the angle between the cover portion and the guide portion is an obtuse angle.

13. A power device is characterized by comprising a propeller, a motor and a protective shell,

the protective housing is used for protecting the motor, the protective housing includes: a protector for covering an upper end surface of the motor;

a plurality of heat dissipation teeth spaced apart from one side of the protector and extending from one side of the protector toward an upper end surface of the motor; wherein the content of the first and second substances,

the motor with the connection can be dismantled to the protective housing, the screw is installed the motor with on the protective housing.

14. The power device as claimed in claim 13, wherein the fixing portion is a hole structure for a connecting member to pass through so that the fixing portion can be mounted on or dismounted from the motor.

15. The power unit according to claim 13, wherein the number of the fixing portions is plural, and the plural fixing portions are provided at intervals in a circumferential direction of the protector.

16. The power unit of claim 15, wherein the securing portion is a threaded through hole or a snap-fit structure.

17. The power unit of claim 13, wherein said axial bore is defined by said guard member.

18. The power device according to claim 13, wherein the through holes are two through holes symmetrically arranged on two sides of the shaft hole, and the centers of the two through holes and the center of the shaft hole are on the same straight line.

19. The power unit according to claim 13, wherein the heat dissipation teeth are arranged radially in a radial direction of the protection member.

20. The power plant of claim 19, wherein the heat dissipating teeth extend linearly.

21. The power unit of claim 20, wherein the heat dissipating teeth are arranged to extend in a curved manner.

22. The power unit of claim 21, wherein the heat dissipating teeth include a heat dissipating tooth body and an inclined portion connected to the heat dissipating tooth body, the inclined portion having an inclined surface extending outwardly from an end near the middle portion of the protector at a gradually increasing distance from the protector.

23. The power unit of any one of claims 13-22, wherein the protective member comprises:

a guide portion extending outward from a periphery of the covering portion.

24. The protective case of claim 23, wherein the angle between the cover portion and the guide portion is obtuse.

25. An unmanned aerial vehicle, characterized in that, includes fuselage, horn and according to any one of claims 13 to 24 the power device, power device set up in horn one end for unmanned aerial vehicle provides flight power.