WO2018064802A1

WO2018064802A1 - Motor, pan-tilt-zoom having motor, and unmanned aerial vehicle having pan-tilt-zoom

Info

Publication number: WO2018064802A1
Application number: PCT/CN2016/101459
Authority: WO
Inventors: 李卫东; 赵岩崇; 刘国尧
Original assignee: 深圳市大疆灵眸科技有限公司
Priority date: 2016-10-08
Filing date: 2016-10-08
Publication date: 2018-04-12
Also published as: CN106688163B; CN106688163A

Abstract

Provided is a motor (100), comprising: a housing and a drive shaft assembly disposed in said housing; said drive shaft assembly comprises: a drive shaft (4) and a first bearing (51) and a second bearing (52); the drive shaft (4) comprises a drive end (41) and a fixed end (43); said drive end (41) is used for connecting to an external component and driving said external component to rotate; said fixed end (43) extends into the housing; the first bearing (51) and the second bearing (52) are arranged around the drive end (41) and the fixed end (43), respectively; the peripheral dimension of the cross-section of the drive end (41) is larger than the peripheral dimension of the cross section of the fixed end (43), so as to prevent the first bearing (51) and the second bearing (52) from slipping off of the drive end (41).

Description

Motor, pan/tilt with motor and drone with pan/tilt

Technical field

The invention relates to the technical field of electric motors, in particular to an electric machine, a cloud platform with a motor and a drone with a cloud platform.

Background technique

A motor is a device that converts electrical energy into mechanical energy that can be applied to many devices (eg, pan/tilt) to provide a power source.

Existing electric machines generally include a drive shaft for connecting an external component and driving the rotation of the external component, and two bearings sleeved on the drive shaft. However, when the existing motor is installed, two bearings need to be sleeved on the drive shaft from different directions, which makes the installation inconvenient. In addition, the drive shaft on the existing motor is relatively slender and cannot be made short and thick, resulting in poor stability of the motor during operation.

Summary of the invention

The invention provides a motor, a cloud platform with a motor and a drone with a cloud platform.

According to a first aspect of the embodiments of the present invention, there is provided an electric machine comprising: a housing and a drive shaft assembly mounted in the housing; the drive shaft assembly comprising: a drive shaft and first and second bearings The drive shaft includes a driving end for connecting an external component and driving the external component to rotate, the fixing end extending into the housing, the first bearing and the first Two bearings are respectively sleeved on the driving end and the fixed end, and a peripheral dimension of a cross section of the driving end is larger than a peripheral dimension of a cross section of the fixed end to block the first bearing and the second bearing Detach from the drive end.

According to a second aspect of the embodiments of the present invention, there is provided a pan/tilt head for carrying a load, the pan/tilt head comprising a motor and at least one support arm assembly driven by the motor, the motor comprising: a housing and a mounting a drive shaft assembly in the housing; the drive shaft assembly includes: a drive shaft and a first bearing and a second bearing, the drive shaft including a drive end and a fixed end, the drive end for connecting an external component and Driving the external component to rotate, the fixed end extends into the housing, and the first bearing and the second bearing are respectively sleeved on the driving end and the fixed end, and the driving end is horizontal The outer peripheral dimension of the cross section is larger than the outer peripheral dimension of the cross section of the fixed end to prevent the first bearing and the second bearing from coming off the driving end.

According to a third aspect of the embodiments of the present invention, a drone includes a body and a pan/tilt for carrying a load, the pan/tilt is coupled to the body, the pan/tilt includes a motor, The motor includes: a housing and a drive shaft assembly mounted in the housing; the drive shaft assembly includes: a drive shaft and a first bearing and a second bearing, the drive shaft including a drive end and a fixed end, a driving end for connecting an external component and driving the external component to rotate, the fixing end extending into the housing, the first bearing and the second bearing being respectively sleeved on the driving end and the fixing In the end, the outer peripheral dimension of the cross section of the driving end is larger than the outer peripheral dimension of the cross section of the fixed end to prevent the first bearing and the second bearing from coming off the driving end.

The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

Since the drive shaft of the motor includes a drive end and a fixed end, the outer peripheral dimension of the cross section of the drive end is larger than the outer peripheral dimension of the cross section of the fixed end, such that the first bearing and the second bearing are not easily driven from the drive The end is out. Moreover, with such a drive shaft structure, the drive shaft of the motor can be made short and thick to improve the stability of the motor during rotation. In addition, during the installation of the motor, the first bearing and the second bearing can be sleeved on the drive shaft from the same direction, so that the assembly of the motor is easier and the assembly efficiency is higher.

DRAWINGS

1 is an exploded view of a motor according to an embodiment of the present invention;

2 is a schematic view of an assembled motor according to an embodiment of the present invention;

Figure 3 is a cross-sectional view of the motor taken along line A-A of Figure 2;

4 is a perspective view of a pan/tilt head according to an embodiment of the invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 1 to FIG. 3, an electric motor 100 according to an embodiment of the present invention includes a housing, a stator base 31 fixed to the housing, and a stator 3 received in the stator base 31. The rotor 2 and the drive shaft assembly that rotate on the stator 3. In an embodiment, the motor 100 is an inner rotor motor. The stator 3 includes a stator core and windings provided in the stator core, and the rotor 2 is formed with a plurality of pairs of magnets to generate a magnetic field, thereby realizing rotation of the rotor 2 with respect to the stator 3. The drive shaft assembly includes a drive shaft 4 and a first bearing 51 and a second bearing 52 that are sleeved from the same direction on the drive shaft 4. The first bearing 51 and the second bearing 52 function to support the drive shaft 4 in the radial direction of the drive shaft 4.

In this embodiment, the housing includes a first housing 11 and a second housing 12 that cooperates with the first housing 11. The first housing 11 and the second housing 12 can pass bolts. For assembly, the second housing 12 is provided with an opening 121 through which the drive shaft 4 passes. The first housing 11 is coupled to a support arm 8 for supporting the motor 100. Of course, the components and the manner of cooperation of the housing are not limited thereto.

The second housing 12 is provided with a mounting space for arranging the first bearing 51. The stator seat 31 is provided with a mounting space for arranging the second bearing 52.

In this embodiment, the drive shaft 4 may include a driving end 41 for connecting an external component and driving the external component to rotate, and the fixing end 43 extends into the housing. The first bearing 51 and the second bearing 52 are respectively sleeved on the driving end 41 and the fixed end 43 . The outer peripheral dimension of the cross section of the driving end 41 is larger than the cross section of the fixed end 43 . Peripheral size. With such a drive shaft structure, the first bearing 51 and the second bearing 52 can be sleeved on the drive shaft 4 from the same direction, and the first bearing 51 and the second bearing 52 can be prevented from being The drive end 41 is disengaged. The driving end 41 and the fixed end 43 may have a circular or other shape in cross section.

Further, the drive shaft 4 further includes a connecting portion 45 connected to the driving end 41 and located outside the second housing 12, and the connecting portion 45 is for performing with a device (such as a camera) that is required to be driven. Connected, when the drive shaft 4 rotates, the device can be rotated by the connecting portion 45. The diameter of the connecting portion 45 is larger than the diameter of the driving end 41 to achieve the limitation of the driving shaft 4 by abutting the connecting portion 45 against the housing; and, by making the diameter of the connecting portion 45 Larger, the stability of the motor 100 during rotation can be made better.

In this embodiment, the diameter of the connecting portion 45 may be larger than the diameter of the opening 121, thereby improving the stability of the motor, and also ensuring that people cannot see the components located in the housing through the opening 121, and the lifting motor Aesthetics.

In this embodiment, the first bearing 51 is mounted in the second housing 12 , and the second bearing 52 is mounted in the stator housing 31 . The first bearing 51 and the second bearing 52 respectively have an inner ring, an outer ring and balls embedded between the inner ring and the outer ring, and the inner ring of the first bearing 51 can be fixed with the drive shaft 4 to Rotating together with the drive shaft 4, the outer ring of the first bearing 51 can be fixed with the second housing 12; the inner ring of the second bearing 52 can be fixed with the drive shaft 4 to rotate together with the drive shaft 4 The outer ring of the second bearing 52 can be fixed to the stator base 31. It should be noted that the inner ring of the bearing and the drive shaft, the outer ring of the bearing and the housing or the stator seat can be fixed by gluing.

In this embodiment, the motor 100 further includes a lock for mounting on the drive shaft 4. a tightening member 7 in the axial direction of the drive shaft 4, the locking member 7 is located between the first bearing 51 and the second bearing 52, and the locking member 7 is for the drive shaft 4 And the first bearing 51 is fixed to the second housing 12.

Here, for convenience of description, the axial direction from the driving end 41 of the drive shaft 4 to the fixed end 43 may be defined as a first direction defining an axial direction from the fixed end 43 of the drive shaft 4 to the drive end 41. The direction is a second direction, and the first direction is a reverse direction of the second direction.

In this embodiment, the locking member 7 can be a nut having an internal thread, and the driving end 41 is formed with an external thread that cooperates with the internal thread, and the inner diameter of the nut can be larger than the fixed end 43. The diameter of the locking member 7 can be sleeved on the driving shaft 4 along the first direction, and the locking member 7 is fixed to the driving shaft 4 by the cooperation of internal and external threads. On the drive end 41. Of course, the locking member 7 and the drive shaft 4 can also be fixed by other fixing methods, such as a gluing method, a riveting method and the like.

Further, a shaft shoulder 44 is formed between the driving end 41 and the fixed end 43 . The locking member 7 can be located at a position of the driving end 41 near the shoulder 44. On the one hand, The assembly process can be made easier, and on the other hand, the length of the external thread formed on the drive end 41 can be made as short as possible and easy to process. It is a matter of course that in other embodiments, the locking member 7 can be disposed at other positions of the driving end 41 according to actual needs.

It should be noted that in other embodiments, the driving end 41 and the fixing end 43 of the driving shaft 4 may have the same diameter, and may form an external thread on the entire fixing end 43 and extend to the driving end 41, thereby The locking member 7 is screwed from one end of the fixed end 43 until it is fixed to a specified position on the driving end 41.

In this embodiment, in order to eliminate the existing play between the drive shaft and the bearing, the motor operation is more stable, and the drive shaft assembly may further include the lock member 7 and the second bearing 52. The pretensioning assembly 6 is for eliminating the presence of play between the drive shaft and the bearing by means of constant pressure preloading. The pretensioning assembly 6 includes a drive shaft 4 and is slidable An elastic member 61 of the shaft 4 that is compressed in the axial direction, one end of the elastic member 61 can abut against the locking member 7, and the other end applies a preload force to the second bearing 52. The elastic member may be a spring, a rubber or the like. In an alternative embodiment, one end of the resilient member 61 can abut the shoulder portion 44 and the other end applies a pre-tension to the second bearing 52. It is worth mentioning that in other embodiments, the play can also be eliminated by other means, such as positioning pre-tightening.

Further, the pretensioning assembly 6 further includes a spacer 63 sleeved on the drive shaft 4, and the spacer 63 is located on the elastic member 61 and the first in the axial direction of the drive shaft 4. Between the two bearings 52, the other end of the elastic member 61 abuts on the spacer 63. If the dimension of the end of the spacer 63 adjacent to the elastic member 61 in the radial direction of the drive shaft is defined as R1, and the dimension of the elastic member 61 in the radial direction of the drive shaft is defined as R2, then R1>R2. By the above-mentioned spacer 63, it is possible to prevent the elastic member 61 from directly abutting against the second bearing 52, preventing the ball from coming into contact with the ball of the second bearing 52 due to the sway, and eliminating the adverse effect on the rotational performance of the motor.

As shown in FIG. 3, in the present embodiment, the rotor 2 includes a rotor main body 21 and a pipe wall 22 connected to the rotor main body 21. The tube wall 22 is located between the locking member 7 and the first bearing 51 in the axial direction of the drive shaft 4, and the locking member 7 abuts the tube wall 22 and the first The shaft 51 is supported on the housing. The tube wall 22 is used for the drive shaft 4 to pass through, and the rotor 2 and the drive shaft 4 are fixed to each other by the tube wall 22. Further, the tube wall 22 and the drive shaft 4 can be fixedly connected by means of glue.

Further, the size of the locking member 7 in the radial direction of the drive shaft 4 can be large The tube wall 22 is sized in the radial direction of the drive shaft 4 such that the drive shaft 4 and the tube wall 22 are more securely fixed.

Further, a step portion 47 is further formed between the connecting portion 45 and the driving portion 41, and the first bearing 51 is abutted against the step portion 47 such that the first bearing 51 is mounted on the first bearing 51. When the stator 2 and the first bearing 51 are fixed to the second casing 12 through the locking member 7, the first bearing 51 can be restricted by the step portion 47, and is convenient. installation.

Continuing with the reference to FIGS. 1 and 3, the assembly process of the motor 100 is roughly as follows:

First, the stator 3 and the second bearing 52 are respectively mounted in the first casing 11. Then, the drive shaft 4 is passed through the opening 121 of the second housing 12 (the connecting portion 45 is located outside the opening 121), and the first bearing 51 is sleeved on the driving end 41 of the drive shaft 4 in the second direction. And disposed in the installation space on the second casing 12. Next, the tube wall 22 of the rotor 2 is sleeved on the drive end 41 of the drive shaft 4 in the second direction, during which glue can be applied to the designated position of the tube wall 22 or the drive shaft 4. Subsequently, the locking member 7 is sleeved on the drive shaft 4 in the second direction, and the locking member 7 is tightened to be fixed to the driving end 41 of the drive shaft 4. Wherein, after the locking member 7 is tightened, the tube wall 22 abuts against the locking member 7 and the inner ring of the first bearing 51, respectively. Then, the elastic member 61 and the spacer 63 are sleeved on the drive shaft 4 in the second direction, and the drive shaft 4 as a whole is pressed into the first housing 11. In the process, the second bearing 52 is sleeved on the fixed end 43 of the drive shaft 4 in the second direction. Finally, the first housing 11 and the second housing 12 are fixed, and thus the motor 100 is assembled.

It can be seen that since the motor 100 includes a locking member 7 for mounting on the drive shaft 4, the locking member 7 is located between the first bearing 51 and the second bearing 52, and can be passed through when the motor 100 is mounted. The locking member 7 fixes the drive shaft 4 and the first bearing 51 to the housing of the motor 100, and the first bearing 51 and the second bearing 52 can be sleeved on the drive shaft from the same direction. 4, this can make the assembly of the motor 100 easier and the assembly efficiency higher than that of the first bearing 51 and the second bearing 52 being sleeved on the drive shaft 4 from two different directions.

In addition, the present invention can fix the rotor shaft 2 and the drive shaft 4 by fixing the drive shaft 4 and the rotor 2 to the housing by means of the locking member 7 as compared with fixing the rotor 2 and the drive shaft 4 by gluing. More robust, the axial limit of the drive shaft 4 is better; and, the internal structure of the motor is more compact, and the space utilization in the housing is higher. Further, since it is no longer necessary to form a portion for axially limiting on the drive shaft 4, the diameter of the drive end 41 on the drive shaft 4 is made larger and larger, and the machining difficulty of the drive shaft 4 can be reduced to some extent.

In addition to the fixing of the drive shaft 4 and the rotor 2 to the housing, the locking member 7 can also be used to limit the elastic member 61 in the pretensioning assembly 6, that is, the one end of the elastic member 61 is abutted. Connected to the locking member 7. The elastic member 61 is restrained by the shoulder formed on the drive shaft 4, and since the locking member 7 increases the size of the shoulder portion of the drive shaft 4 to a certain extent, a shorter and thicker one can be used. The elastic member 61 is used to enhance the pre-tightening effect, so that the motor has better rotation performance.

As shown in FIG. 4, in an embodiment, the motor 100 described above can be applied to a pan/tilt head for carrying a load (eg, a camera). The pan/tilt includes one or more electric machines 100, and

support arm assemblies

400, 500, 600 that are driven by respective electric machines 100. The driving end of the motor 100 is used to connect the above-described

support arm assemblies

400, 500, 600, and can drive the

support arm assemblies

400, 500, 600 to rotate.

In an embodiment, the pan/tilt can be applied to a drone, and the drone can include a fuselage, a pan/tilt for carrying a load, and the pan/tilt is connected to the fuselage. Of course, the field of application of the motor 100 is not limited.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included in the present invention. Within the scope of protection.

The motor provided by the embodiment of the present invention is described in detail above. The principle and the embodiment of the present invention are described in the following. The description of the above embodiment is only used to help understand the method and core idea of the present invention. At the same time, for the average person in the field In the above, the description of the present invention is not limited to the scope of the present invention.

Claims

An electric motor comprising: a housing and a drive shaft assembly mounted in the housing; wherein the drive shaft assembly includes: a drive shaft and a first bearing and a second bearing, the drive shaft including a drive And a fixed end, the driving end is configured to connect an external component and drive the external component to rotate, the fixed end extends into the housing, and the first bearing and the second bearing are respectively sleeved On the driving end and the fixed end, the outer peripheral dimension of the cross section of the driving end is larger than the outer peripheral dimension of the cross section of the fixed end to prevent the first bearing and the second bearing from coming off the driving end.
The motor according to claim 1, wherein said motor further comprises a rotor and a locking member fixed to said drive shaft, said locking member abutting said rotor and said first bearing On the shell.
The motor according to claim 2, wherein a shoulder portion is formed between the driving end and the fixed end, and the locking member is fixed to the driving end.
The motor according to claim 2, wherein a shoulder portion is formed between the driving end and the fixed end, and the locking member is located at a position of the driving end close to the shoulder portion.
The motor according to claim 2, wherein said locking member is a nut having an internal thread, and said driving end is formed with an external thread that cooperates with said internal thread.
The electric machine according to claim 2, wherein said drive shaft assembly further comprises a pretensioning assembly between said locking member and said second bearing; said pretensioning assembly comprising said drive An elastic member on the shaft and capable of being compressed in the axial direction of the drive shaft, one end of the elastic member abuts against the locking member, and the other end applies a preload force to the second bearing.
The electric machine according to claim 4, wherein said drive shaft assembly further comprises a pretensioning assembly between said shoulder portion and said second bearing; said pretensioning assembly comprising said drive An elastic member on the shaft and compressible in an axial direction of the drive shaft, one end of the elastic member abuts against the shoulder portion, and the other end applies a preload force to the second bearing.
The motor according to claim 6 or 7, wherein said pretensioning assembly further comprises a gasket disposed on the drive shaft, the gasket being located between the elastic member and the second bearing in an axial direction of the drive shaft, the other end of the elastic member abutting On the spacer.
The motor according to claim 8, wherein a dimension of an end of said spacer adjacent said elastic member in a radial direction of said drive shaft is larger than a dimension of said elastic member in a radial direction of said drive shaft.
The motor according to claim 6 or 7, wherein the elastic member is a spring.
The motor according to claim 2, wherein said rotor comprises a rotor body and a pipe wall connected to said rotor body; said pipe wall being located in said locking member and in an axial direction of said drive shaft Between the first bearings, the locking member abuts the tube wall and the first bearing on the housing.
The motor according to claim 11, wherein said tube wall is fixedly coupled to said drive shaft by an adhesive.
The motor according to claim 2, wherein the housing comprises a first housing and a second housing that cooperates with the first housing, and the first housing is provided with a stator seat. The stator seat is for receiving a stator, the second bearing is mounted in the stator seat, and the locking member is for fixing the drive shaft and the first bearing to the second housing .
The motor according to claim 13, wherein the second housing is provided with a seating space for arranging the first bearing, and an outer ring of the first bearing is fixed to the second housing. The inner ring of the first bearing is fixed to the drive shaft.
The motor according to claim 13, wherein said second housing is provided with an opening through which said drive shaft passes.
The motor according to claim 1, wherein said drive shaft further comprises a connecting portion connected to said driving end and located outside said housing, said connecting portion having a diameter larger than a diameter of said driving end.
The motor according to claim 16, wherein a step portion is further formed between the connecting portion and the driving portion, and the first bearing abuts against the step portion.
a pan/tilt head for carrying a load, the pan/tilt head comprising a motor and at least one support arm assembly driven by the motor, the motor comprising: a housing and a drive shaft assembly mounted in the housing; The drive shaft assembly includes a drive shaft and a first bearing and a second bearing, the drive shaft including a drive end and a fixed end, the drive end being configured to connect the support arm assembly and drive the support The arm assembly rotates, the fixed end projects into the housing, and the first bearing and the second bearing are respectively sleeved on the driving end and the fixed end, and the outer circumference of the cross section of the driving end The outer dimension of the cross section of the fixed end is larger than the outer end of the fixed end to prevent the first bearing and the second bearing from coming off the drive end.
The platform according to claim 18, wherein said motor further comprises a rotor and a locking member fixed to said drive shaft, said locking member abutting said rotor and said first bearing On the housing.
The platform according to claim 19, wherein a shoulder portion is formed between the driving end and the fixed end, and the locking member is fixed to the driving end.
The platform according to claim 19, wherein a shoulder portion is formed between the driving end and the fixed end, and the locking member is located at a position of the driving end near the shoulder portion .
The platform according to claim 19, wherein the locking member is a nut having an internal thread, and the driving end is formed with an external thread that cooperates with the internal thread.
The pan/tilt head according to claim 19, wherein said drive shaft assembly further comprises a pretensioning assembly between said locking member and said second bearing; said pretensioning assembly comprising said An elastic member on the drive shaft and capable of being compressed in the axial direction of the drive shaft, one end of the elastic member abuts against the lock member, and the other end applies a preload force to the second bearing.
The pan/tilt head according to claim 21, wherein said drive shaft assembly further comprises a pretensioning assembly between said shoulder portion and said second bearing; said pretensioning assembly comprising said An elastic member on the drive shaft and compressible in an axial direction of the drive shaft, one end of the elastic member abuts against the shoulder portion, and the other end applies a preload force to the second bearing.
A platform according to claim 23 or 24, wherein said pretensioning assembly Further comprising a spacer sleeved on the drive shaft, the spacer being located between the elastic member and the second bearing in an axial direction of the drive shaft, the other end of the elastic member abutting On the spacer.
The platform according to claim 25, wherein a dimension of an end of said spacer adjacent said elastic member in a radial direction of said drive shaft is larger than a dimension of said elastic member in a radial direction of said drive shaft.
A platform according to claim 23 or 24, wherein the elastic member is a spring.
The platform according to claim 19, wherein said rotor comprises a rotor body and a pipe wall connected to said rotor body; said pipe wall being located in said locking member in an axial direction of said drive shaft Between the first bearing and the first bearing, the locking member abuts the tube wall and the first bearing on the housing.
A platform according to claim 28, wherein said tube wall is fixedly coupled to said drive shaft by an adhesive.
The pan/tilt head according to claim 19, wherein the housing comprises a first housing and a second housing that cooperates with the first housing, and the first housing is provided with a stator seat The stator seat is for receiving a stator, the second bearing is mounted in the stator seat, and the locking member is for fixing the drive shaft and the first bearing to the second housing on.
The platform according to claim 30, wherein the second housing is provided with a seating space for arranging the first bearing, and an outer ring of the first bearing is fixed to the second housing. The inner ring of the first bearing is fixed to the drive shaft.
The platform according to claim 30, wherein said second casing is provided with an opening through which said drive shaft passes.
The platform according to claim 18, wherein said drive shaft further comprises a connecting portion connected to said driving end and located outside said housing, said connecting portion having a diameter larger than a diameter of said driving end.
The platform according to claim 33, wherein a step portion is further formed between the connecting portion and the driving portion, and the first bearing abuts against the step portion.
An unmanned aerial vehicle includes a fuselage and a cloud platform for carrying a load, the pan/tilt head being coupled to the fuselage, the pan/tilt head comprising a motor and at least one support arm assembly driven by the motor, The motor includes: a housing and a drive shaft assembly mounted in the housing; wherein the drive shaft assembly includes: a drive shaft and a first bearing and a second bearing, the drive shaft including a drive end and a fixed end, the driving end is configured to connect the support arm assembly and drive the support arm assembly to rotate, the fixed end extends into the housing, and the first bearing and the second bearing are respectively sleeved On the driving end and the fixed end, a peripheral dimension of a cross section of the driving end is larger than a peripheral dimension of a cross section of the fixed end to prevent the first bearing and the second bearing from the driving end Come out.
The drone according to claim 35, wherein said motor further comprises a rotor fixed to said drive shaft and a locking member, said locking member abutting said rotor and said first bearing On the housing.
The drone according to claim 36, wherein a shoulder portion is formed between the driving end and the fixed end, and the locking member is fixed to the driving end.
The drone according to claim 36, wherein a shoulder portion is formed between the driving end and the fixed end, and the locking member is located at a position of the driving end near the shoulder portion At the office.
The drone according to claim 36, wherein said locking member is a nut having an internal thread, and said driving end is formed with an external thread that cooperates with said internal thread.
The drone according to claim 36, wherein said drive shaft assembly further comprises a pretensioning assembly between said locking member and said second bearing; said pretensioning assembly comprising a mounting portion An elastic member on the drive shaft and capable of being compressed in the axial direction of the drive shaft, one end of the elastic member abuts against the lock member, and the other end applies a preload force to the second bearing.
A drone according to claim 38, wherein said drive shaft assembly further comprises a pretensioning assembly between said shoulder portion and said second bearing; said pretensioning assembly comprising a mounting portion An elastic member on the drive shaft and compressible in the axial direction of the drive shaft, one end of the elastic member abuts against the shoulder portion, and the other end applies a preload force to the second bearing.
The drone according to claim 40 or 41, wherein said pretensioning assembly further comprises a spacer sleeved on said drive shaft, said spacer being located in an axial direction of said drive shaft Between the elastic member and the second bearing, the other end of the elastic member abuts on the gasket.
The drone according to claim 42, wherein a dimension of an end of said spacer adjacent said elastic member in a radial direction of said drive shaft is larger than a dimension of said elastic member in a radial direction of said drive shaft.
The drone according to claim 40 or 41, wherein the elastic member is a spring.
The drone according to claim 36, wherein said rotor includes a rotor body and a pipe wall connected to said rotor body; said pipe wall being located in said axial direction of said drive shaft Between the piece and the first bearing, the locking member abuts the tube wall and the first bearing on the housing.
The drone according to claim 45, wherein said tube wall and said drive shaft are fixedly coupled by an adhesive.
The drone according to claim 36, wherein said housing comprises a first housing and a second housing mated with said first housing, said first housing having a stator a stator seat for receiving a stator, the second bearing being mounted in the stator seat, the locking member for fixing the drive shaft and the first bearing to the second shell Physically.
The drone according to claim 47, wherein said second casing is provided with a seating space for arranging said first bearing, and said outer ring of said first bearing is fixed to said second casing The inner ring of the first bearing is fixed to the drive shaft.
The drone according to claim 47, wherein said second casing is provided with an opening through which said drive shaft passes.
The drone according to claim 35, wherein said drive shaft further comprises a connecting portion connected to said driving end and located outside said housing, said connecting portion having a diameter larger than a diameter of said driving end.
The drone according to claim 50, wherein a step portion is further formed between the connecting portion and the driving portion, and the first bearing abuts against the step portion.