CN222147284U

CN222147284U - Motor and equipment

Info

Publication number: CN222147284U
Application number: CN202420725716.7U
Authority: CN
Inventors: 姚佑平; 蒋其松; 廖伟康; 魏然
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd
Priority date: 2024-04-09
Filing date: 2024-04-09
Publication date: 2024-12-10
Anticipated expiration: 2034-04-09

Abstract

The utility model discloses a motor and equipment, wherein the motor comprises a stator assembly, the stator assembly has a housing; a rotor assembly, the rotor assembly is rotatably arranged in the stator assembly, and the rotor assembly has a rotating shaft; wherein one end of the rotating shaft extends out of the housing, the housing is provided with a first sealing member for sealing the gap between the rotating shaft and the housing, and the housing is provided with an airtight hole for checking airtightness. The technical solution of the utility model effectively isolates the possibility of external water vapor and dust entering the interior of the motor by providing a first sealing member in the gap between the rotating shaft and the housing, thereby improving the protection level of the motor and further ensuring the service life of the motor in harsh environments.

Description

Motor and equipment

Technical Field

The utility model relates to the field of motors, in particular to a motor and equipment.

Background

In the automobile, energy storage and other working environments with high requirements on the motor, gaps at the joint of the two end covers of the motor and the shell are easy to be invaded by dust and water vapor.

Disclosure of utility model

The utility model mainly aims to provide a motor, which aims to reduce the possibility of dust and water vapor invading into the motor and ensure the service life of the motor

To achieve the above object, the present utility model provides an electric motor comprising

A stator assembly having a housing;

The rotor assembly is rotationally arranged in the stator assembly and is provided with a rotating shaft;

One end of the rotating shaft extends out of the shell, a first sealing piece for sealing a gap between the rotating shaft and the shell is arranged on the shell, and an airtight hole for checking air tightness is formed in the shell.

Alternatively/in an embodiment, the end of the housing is provided with a mounting member, the shaft is rotatably connected to the mounting member, and the first seal member is disposed within the mounting member.

Alternatively/in an embodiment, the side wall of the rotating shaft is provided with a first bearing, and a first bearing groove is formed on one side of the mounting member, and the first bearing is disposed in the first bearing groove.

Optionally/in an embodiment, a first sealing groove is formed on a side, facing away from the first bearing groove, of the mounting piece, the first sealing piece is fixedly arranged in the first sealing groove, and the rotating shaft penetrates through the first sealing piece and extends out of the housing.

Alternatively/in an embodiment, the first seal comprises a body, an inner wall of the body protruding towards the shaft forming an extension with a first lip that abuts the shaft.

Alternatively/in one embodiment, the extension is further provided with a second lip that abuts the shaft.

Alternatively/in an embodiment, an oil storage cavity is formed between the first lip and the second lip.

Alternatively/in one embodiment, the outer periphery of the second lip is provided with a resilient fastener for maintaining the interference of the second lip with the spindle.

Alternatively/in an embodiment, the body is ring-shaped.

Alternatively/in an embodiment, a support is provided between the body and the extension.

Alternatively/in an embodiment, the housing includes a shell and an end cover, the first sealing member is disposed at one end of the shell, the other end of the shell is opened and provided with a plurality of connecting members, the connecting members are used for installing the end cover, and one end of the rotating shaft is rotatably connected to the end cover.

Alternatively/in an embodiment, the end cap has an annular boss cooperating with the housing, a second seal being provided between the annular boss and the housing.

Alternatively/in an embodiment, the end of the shaft is provided with a second bearing groove, and the end cap has a second bearing groove, and the second bearing is disposed in the second bearing groove.

Alternatively/in an embodiment, the outer circumference of both the first bearing and the second bearing is provided with at least one friction ring for increasing friction between the first bearing and the first bearing groove, the second bearing and the second bearing groove.

Alternatively/in an embodiment, the airtight hole is provided in the end cap, which communicates with the interior of the housing, and the end cap is further provided with a third seal for sealing the airtight hole.

Alternatively/in an embodiment, the third sealing member has a head portion and a connecting portion coaxially provided at one side of the head portion, the connecting portion being fixedly connected to the airtight hole, the head portion having a diameter larger than that of the airtight hole.

Optionally/in an embodiment, a second sealing groove is formed in a concave manner on a side surface, connected with the connecting portion, of the head portion, and a sealing ring is arranged in the second sealing groove and abuts against between the head portion and the end cover.

The utility model also provides equipment comprising the motor.

According to the technical scheme, the first sealing piece is arranged in the gap between the rotating shaft and the shell, so that the possibility that external water vapor and dust enter the motor is effectively isolated, the protection level of the motor is improved, and the service life of the motor in a severe environment is further guaranteed.

Drawings

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

FIG. 1 is a schematic diagram of the overall structure of a motor according to the present utility model;

FIG. 2 is an exploded view of the overall structure of the motor of the present utility model;

FIG. 3 is a schematic cross-sectional view of a motor according to the present utility model;

FIG. 4 is a schematic cross-sectional view of a stator assembly of an electric motor according to the present utility model;

FIG. 5 is a schematic view of a bottom view of a stator assembly of an electric motor according to the present utility model;

FIG. 6 is a schematic structural view of an end cap of the motor of the present utility model;

FIG. 7 is a schematic view of the motor mounting structure of the present utility model;

FIG. 8 is a schematic view of the first seal of the motor of the present utility model;

FIG. 9 is a cross-sectional view of the first seal of the motor of the present utility model;

FIG. 10 is a schematic view of the structure of the motor connector according to the present utility model;

Fig. 11 is a structural cross-sectional view of a third seal of the motor of the present utility model.

Reference numerals illustrate:

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

Detailed Description

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

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

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

The motor is a common device and is applied in various fields, the motor can convert electric energy into mechanical energy so as to drive related parts to operate, and the motor has better reliability and longer service life, so that the motor also has various application environments.

For example, a new energy automobile is driven by a motor to drive wheels so as to complete running, and an electric window, an electric seat, an electric fan, an electric pump, an electric power steering system, and the like in the automobile are all completed by means of the motor, the motor is arranged in equipment such as an electric fan, a refrigerator, a washing machine, a smoke exhaust ventilator, a dust collector, and the like in the field of household appliances, the motor is used for driving various mechanical equipment such as a machine tool, a conveyor belt, a fan, a pump, a compressor, and the like in the field of industrial manufacturing so as to support manufacturing and production processes, and the motor is used for driving an engine, a flap, a landing gear, and avionics of an airplane in the field of aerospace. It can be seen that the motor has various application ways and various working environments.

The motor generally comprises a rotor assembly and a stator assembly, wherein the stator assembly is fixedly arranged, a space for accommodating a rotor is formed in the stator assembly, the rotor is rotatably arranged in the stator, in short, when the motor is electrified, the rotor and the stator generate magnetic fields, the rotor can rotate in the stator due to mutual exclusion of the magnetic fields between the rotor and the stator, and further, electric energy is converted into mechanical energy, in particular, the rotor is provided with a rotating shaft, the rotating shaft is connected with related external parts, and accordingly, when the rotor rotates, the rotating shaft rotates along with the rotating shaft, and further, the external parts are driven to do work.

The stator assembly generally comprises a stator iron core and a stator winding, wherein the stator winding is arranged on the stator iron core and is used for electrifying and generating a magnetic field, the stator iron core and the stator winding are fixedly arranged, namely, the stator iron core and the stator winding do not move after the stator winding is electrified, correspondingly, the rotor assembly comprises a rotating shaft, the rotor iron core and the rotor winding, the rotating shaft coincides with the central shaft of the stator assembly, the rotor iron core is arranged on the rotating shaft in a surrounding manner, the rotor winding is arranged on the rotor iron core, and when the rotor winding and the stator winding are electrified, the rotor winding and the stator winding generate the magnetic field, and then the rotor assembly starts to rotate under the action of the magnetic field, so that the motor can convert electric energy into mechanical energy.

However, since the motor is in various application scenes, when the motor is in a high humidity environment or a high dust environment, the motor may be short-circuited or excessively worn due to moisture or dust entering therein, thereby affecting the service life of the motor.

Referring to fig. 1 and 2, in order to solve the above-mentioned problems, the present utility model provides a motor, which comprises a stator assembly 1 and a rotor assembly 2, wherein the stator assembly 1 has a housing 11, the rotor assembly 2 is rotatably disposed in the stator assembly 1, the rotor assembly 2 has a rotating shaft 21, one end of the rotating shaft 21 protrudes from the housing 11 to drive the external related components to connect, in the present utility model, the rotating shaft 21 protrudes from the outer circumferential side wall of the end of the housing 11 to have a first bearing 22, so that the rotor assembly 2 can rotate compared with the stator assembly 1, and in order to reduce the possibility of the motor failure caused by the water vapor or dust entering into the motor, a first sealing member 33 for sealing the gap between the rotating shaft 21 and the housing 11 is disposed on the housing 11, so that the possibility of the external related components from entering into the motor is effectively isolated by the first sealing member 33 while the rotating shaft 21, thereby improving the protection level of the motor and further guaranteeing the service life of the motor under severe environment.

Referring to fig. 1 to 3, in particular, in the present utility model, the housing 11 is approximately cylindrical, so that the housing 11 has two ends, it is necessary to select other three-dimensional shapes of the housing 11 according to factors such as actual design requirements, in addition to the cylindrical, so as to satisfy driving principles of the motor, on the basis of the above, the first sealing member 33 is mounted, the mounting member 3 is disposed on the housing 11, the mounting member 3 is coaxially disposed with the housing 11, and the mounting member 3 is coaxially disposed with the rotating shaft 21, thereby providing good coaxiality between the mounting member 3, the housing 11 and the rotating shaft 21, so that stable operation of the rotor assembly 2 in the housing 11 can be ensured, and accordingly, the rotating shaft 21 is rotatably connected to the mounting member 3, and the first sealing member 33 is disposed in the mounting member 3 and seals the rotating shaft 21.

Referring to fig. 3 to 7, specifically, a first bearing groove 31 is formed on a side of the mounting member 3 facing the rotor assembly 2, a first sealing groove 32 is formed on a side of the mounting member 3 facing away from the rotor assembly 2, and the first bearing 22 is disposed in the first bearing groove 31, so that during the mounting process, an end portion of the rotating shaft 21 sequentially passes through the first bearing groove 31 and the first sealing groove 32 until the first bearing 22 is mounted in the first bearing groove 31, that is, the end portion of the rotating shaft 21 passes through the mounting member 3 to be connected with external parts, so that the rotating shaft 21 rotates to drive the external parts to move, and a first sealing member 33 is disposed in the first sealing groove 32, so that the first sealing member 33 seals the rotating shaft 21, thereby reducing the possibility that water vapor or dust enters into the motor through a gap between the rotating shaft 21 and the mounting member 3.

Referring to fig. 8 and 9, in the present utility model, the first sealing member 33 includes a main body 331, in which the main body 331 is in a ring shape, and the outer side wall of the main body 331 is fixedly connected in the first sealing groove 32, it should be noted that the main body 331 may be embedded in the first sealing groove 32 by an interference fit manner, or the main body 331 may be fixed in the first sealing groove 32 by an adhesive bonding manner, and other fixing methods may be provided, and the main body 331 may be fixed in the first sealing groove 32, and the inner wall of the main body 331 protrudes to the rotating shaft 21 along the radial direction of the main body 331 to form an extension portion 332, and the extension portion 332 has a first lip 333 that abuts against the rotating shaft 21, when the rotating shaft 21 rotates, the first lip 333 keeps an abutting state with the rotating shaft 21 at all times to complete dynamic sealing, so as to reduce the possibility that water vapor and dust enter into the motor through a gap between the rotating shaft 21 and the mounting member 3, and ensure the service life of the motor.

In order to maintain the sealing effect of the first lip 333 on the rotating shaft 21, the first lip 333 is made of rubber, but in the dynamic sealing process of the first lip 333 and the rotating shaft 21, the first lip 333 is rubbed with the peripheral wall of the rotating shaft 21 all the time, so that the first lip 333 is rubbed all the time to generate heat in the running process of the motor, the first lip 333 is subjected to the stress brought by the rotation of the rotating shaft 21, the first lip 333 is easy to age and loses the sealing effect on the rotating shaft 21, in order to solve the aging problem of the first lip 333, the second lip 334 is additionally formed on the extending part 332 and is made of rubber, an included angle is formed between the second lip 334 and the first lip 333, and a space is formed between the first lip 333 and the second lip 334, so that lubricating oil or lubricating grease can be filled in the space, namely, a lubricating oil storage cavity 335 is formed between the first lip 333 and the second lip 334 and is used for storing lubricating oil, the lubricating grease storage cavity 335 is designed, the first sealing element 33 and the rotating shaft 21 are greatly aged, meanwhile, the aging effect of the first sealing element 33 and the rotating shaft 21 is greatly improved, the first sealing element 33 and the sealing gap 33 can be greatly sealed, and the sealing effect of the first sealing element 33 and the rotating shaft 33 is further improved, and the gap 11 is further sealed.

In order to further improve the sealing effect of the first sealing member 33 on the gap between the rotating shaft 21 and the housing 11, the periphery of the second lip 334 is provided with an elastic fastener 336, and in the utility model, the elastic fastener 336 is in a ring shape, and the elastic fastener 336 is arranged to enable the second lip 334 to keep the abutting state with the rotating shaft 21 all the time, so that the sealing effect of the first sealing member 33 on the gap between the rotating shaft 21 and the housing 11 is further improved.

Accordingly, from the viewpoint of the service life of the first sealing element 33, considering that an included angle exists between the extending portion 332 and the main body 331, in order to reduce the possibility of deformation between the extending portion 332 and the main body 331 due to stress during long-time operation, a supporting frame 337 is disposed between the main body 331 and the extending portion 332, in this embodiment, the supporting frame 337 is in an L shape, two sides of the supporting frame 337 are respectively attached to the main body 331 and the extending portion 332, so as to provide support between the main body 331 and the extending portion 332, it is to be noted that other supporting frames 337 may also be employed, in this embodiment, the extending portion 332 extends along an end surface of the main body 331, so that an included angle formed by a right angle is naturally formed between the main body 331 and the extending portion 332, and in other cases, for example, a change in material selection of rubber materials, the included angle between the extending portion 332 and the main body 331 may change, so that the lengths of the first lip 333 and the second lip 334 may also change, and the shape of the supporting frame 337 may need to be rearranged, and the shape of the supporting frame 337 may change according to the actual design requirements, and the concept of the supporting frame 337 may change according to the actual design requirements, and the design requirements may not change according to the design requirements, but may change the design requirements of the extending portion 332 and the first lip 332 and the utility model.

It should be noted that, the above description describes the case where the first bearing groove 31 on the mounting member 3 is disposed in the housing 11, and the first sealing groove 32 faces the outside of the housing 11, in this case, the first sealing member 33 is convenient to be mounted, and the operations of replacing, repairing, adding grease and the like are convenient to be performed on the first sealing member 33, but under certain requirements, the first bearing groove 31 may also face the outside of the housing 11, so that the first sealing groove 32 is disposed in the housing 11, and the possibility that the first sealing member 33 is disabled due to the influence of the external environmental condition may be reduced.

Referring to fig. 3 and 7, in addition, the housing 11 is generally made of plastic, and the mounting member 3 is made of metal in order to ensure structural strength between the rotating shaft 21 and the housing 11, so that the housing 11 can be made by injection molding, and the mounting member 3 is arranged on the end of the housing 11 in the injection molding process, so that the mounting member 3 is directly integrally formed with the housing 11, and in order to improve connection strength between the mounting member 3 and the housing 11, a plurality of connection protrusions 34 are uniformly arranged on the periphery of the mounting member 3, and the connection protrusions 34 are arranged so that a larger contact area is provided between the housing 11 and the mounting member 3, so that the possibility that the mounting member 3 falls off from the housing 11 can be reduced, and connection strength between the mounting member 3 and the housing 11 is improved.

Referring to fig. 2, 3 and 6, in the present utility model, the housing 11 includes a case 111 and an end cap 112, one end of the case 111 is opened, so that the rotor assembly 2 can be mounted to the stator assembly 1, the end cap 112 is used to close the opening of the case 111, in order to mount the end cap 112, the end of the case 111 is provided with a plurality of connection members 1111 (see fig. 10), similar to the mounting member 3, in order to secure the connection strength between the end cap 112 and the case 111, the connection members 1111 are also metal members and can be directly disposed on the end of the case 111 during the injection molding of the case 111, bolts can be disposed on the end cap 112, so that the end cap 112 can be fixed to the case 111 by the engagement of the bolts with the connection members 1111, thereby, considering that the connection members 1111 are cylindrical, and the connection members 1111 are subjected to torsion force during the connection with the bolts, in order to reduce the possibility of the connection members 1111 rotating during the connection with the bolts, the outer circumference of the connection members 1111 are provided with a limit plane 1112, so that the connection members 1111 are formed to be easily blocked by the rotation of the connection members 1112 during the injection molding, and the connection members 1111 can be designed not to be rotated, namely, in the connection between the connection members and the connection members 1111 can be designed to be rotated.

Correspondingly, the end cover 112 is provided with a second bearing slot 1121, the end part of the rotating shaft 21 is provided with a second bearing 23, and the second bearing 23 is arranged in the second bearing slot 1121, so that the end cover 112 and the mounting piece 3 can provide support for the rotating shaft 21 together, and it should be noted that one end of the rotating shaft 21 can extend out of the end cover 112, the other end of the rotating shaft 21 can be arranged in the shell 111, in other words, the mounting piece 3 can be arranged in the end cover 112, and the second bearing slot 1121 is arranged on the end part of the shell 111 far away from the end cover 112, and the specific arrangement can be selected according to practical design requirements.

In order to stably fix the first bearing 22 and the second bearing 23 in the first bearing groove 31 and the second bearing groove 1121, at least one friction ring 24 is disposed on the outer circumferences of the first bearing 22 and the second bearing 23, in this embodiment, two friction rings 24 are disposed on the first bearing 22 and the second bearing 23, and friction between the first bearing 22 and the first bearing groove 31 and between the second bearing 23 and the second bearing groove 1121 can be increased, so that relative sliding between the first bearing 22 and the first bearing groove 31, between the second bearing 23 and the second bearing groove 1121 is not easy to occur, and stability in the operation process of the whole structure is ensured.

Referring to fig. 3 and 6, in the present utility model, the end cap 112 has an annular boss 1122 matched with the housing 111, and a second sealing member 1123 is further provided between the annular boss 1122 and the housing 111 in order to seal between the end cap 112 and the housing 111, and in particular, the second sealing member 1123 may be a rubber ring which abuts therebetween when the end cap 112 is mounted to the housing 111 to provide a seal between the end cap 112 and the housing 111. In addition, a sealant may be applied around the annular boss 1122 before the end cap 112 is attached to the case 111, and the effect of sealing the gap between the end cap 112 and the housing 11 may be achieved.

Referring to fig. 6 and 11, it should be noted that, the casing 11 is provided with an airtight hole 113, the airtight hole 113 is communicated with the interior of the casing 111, so that the overall air tightness of the motor can be detected through the airtight hole 113, the airtight hole 113 can be formed on the casing 111, but in this embodiment, the airtight hole 113 is formed on the end cover 112, the end cover 112 is further provided with a third sealing member 114 for sealing the airtight hole 113, and the possibility that external water vapor and dust enter the motor through the airtight hole 113 is reduced due to the arrangement of the third sealing member 114, so that the service life of the motor is further ensured.

Specifically, the third sealing member 114 has a head 1141 and a connecting portion 1142, the connecting portion 1142 is disposed on one side of the head 1141, the connecting portion 1142 is disposed coaxially with the head 1141, the connecting portion 1142 is fixedly connected to the airtight hole 113, and after the connecting portion 1142 is connected to the airtight hole 113, the head 1141 is required to seal the airtight hole 113, so that the diameter of the head 1141 is larger than that of the airtight hole 113, for example, the connecting portion 1142 is screwed to the airtight hole 113, after the connecting portion 1142 is connected to the airtight hole 113, the head 1141 completely seals the airtight hole 113 to prevent water vapor and dust from entering the motor through the airtight hole 113, and optionally, the connecting portion 1142 and the airtight hole 113 are fixed by interference fit and riveting.

It should be noted that, in order to ensure the plugging effect of the head 1141 on the airtight hole 113, the side surface connected by the head 1141 and the connecting portion 1142 is concavely formed with a second sealing groove 1143, and a sealing ring 1144 is disposed in the second sealing groove 1143, when the head 1141 plugs the airtight hole 113, the sealing ring 1144 will be disposed between the head 1141 and the end cover 112 in a abutting manner, so that the possibility that water vapor and dust enter the motor through the airtight hole 113 is further reduced, and the service life of the motor is further ensured.

The utility model also provides a device, which comprises the motor, and the specific structure of the motor refers to the embodiment, and because the device adopts all the technical schemes of all the embodiments, the device at least has all the beneficial effects brought by the technical schemes of the embodiments, and the details are not repeated here.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. An electric machine, comprising

A stator assembly having a housing;

One end of the rotating shaft extends out of the shell, and the shell is provided with a first sealing piece used for sealing a gap between the rotating shaft and the shell.

2. The motor of claim 1, wherein the end of the housing is provided with a mounting member, the shaft is rotatably coupled to the mounting member, and the first seal member is disposed within the mounting member.

3. The motor of claim 2, wherein a side wall of the rotating shaft is provided with a first bearing, a first bearing groove is formed at one side of the mounting member, and the first bearing is disposed in the first bearing groove.

4. The motor of claim 3, wherein a first seal groove is formed in a side of the mounting member facing away from the first bearing groove, the first seal member is fixedly disposed in the first seal groove, and the rotating shaft extends out of the housing through the first seal member.

5. The motor of claim 4, wherein the first seal comprises a body having an inner wall projecting toward the shaft to form an extension having a first lip that abuts the shaft.

6. The motor of claim 5 wherein said extension is further provided with a second lip that abuts said shaft.

7. The motor of claim 6, wherein an oil reservoir is formed between the first lip and the second lip.

8. A motor as claimed in any one of claims 6 or 7, wherein the outer periphery of the second lip is provided with a resilient fastener for maintaining the interference of the second lip with the shaft.

9. An electric machine as claimed in any one of claims 5 to 7, characterized in that the body is in the form of a ring.

10. The motor of claim 5, wherein a support frame is disposed between the body and the extension.

11. The motor of claim 4, wherein the housing comprises a shell and an end cover, the first sealing member is disposed at one end of the shell, the other end of the shell is open and provided with a plurality of connecting members, the connecting members are used for mounting the end cover, and one end of the rotating shaft is rotatably connected to the end cover.

12. The motor of claim 11 wherein said end cap has an annular boss cooperating with said housing, a second seal being disposed between said annular boss and said housing.

13. The motor of claim 12, wherein the end of the shaft is provided with a second bearing groove, and the end cap has a second bearing groove, the second bearing being disposed in the second bearing groove.

14. The motor of claim 13, wherein the outer circumferences of the first bearing and the second bearing are each provided with at least one friction ring for increasing friction between the first bearing and the first bearing groove, and between the second bearing and the second bearing groove.

15. The motor of claim 11, wherein the end cover is provided with an airtight hole for checking airtightness, the airtight hole being in communication with the inside of the housing, and a third seal for sealing the airtight hole.

16. The motor of claim 15, wherein the third seal member has a head portion and a connecting portion coaxially provided at one side of the head portion, the connecting portion being fixedly connected to the airtight hole, and a diameter of the head portion being larger than a diameter of the airtight hole.

17. The motor of claim 16, wherein a second seal groove is formed in a recess in a side surface of the head portion connected to the connection portion, and a seal ring is disposed in the second seal groove, and the seal ring abuts between the head portion and the end cap.

18. An apparatus comprising the motor of any one of claims 1-17.