Motor and motor end cover

Abstract

The utility model discloses a motor and a motor end cover, the motor end cover comprises an end cover body and a gland, and the end cover body is provided with a limiting hole which is axially arranged in a penetrating manner; the peripheral side face of the gland is provided with a limiting structure matched with the limiting hole, the limiting hole is provided with at least two limiting positions in the axial direction, the gland is provided with a through hole formed in an axial penetrating mode, and the through hole is used for a rotating shaft of the motor to pass through. The side, facing the bearing of the motor rotor, of the gland is also provided with an abutting part, and the abutting part is used for abutting against the bearing of the motor rotor. The gland and the end cover body are assembled in a matched mode through the limiting structure and the limiting hole, the gland abuts against the bearing through the abutting portion on the gland, the axial installation position of the gland can be freely adjusted, then it can be ensured that the abutting portion abuts against the bearing, the axial tolerance of parts and the bearing clearance are eliminated, axial movement of a rotor is prevented, and the service life of the rotor is prolonged. According to the matching mode, gluing treatment between the end cover body and the bearing is not needed, and then the gland can be rapidly detached.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine and an electric machine end cover. BACKGROUND

[0002] In the related art, in an electric machine composed of a stator and a rotor, a rotating shaft of the rotor is rotatably installed in a receiving cavity inside the stator through a bearing, and a wave-shaped elastic pad is usually arranged between the stator and the bearing in the axial direction of the rotating shaft of the rotor to provide pre-tightening force to the bearing, offset the axial tolerance of the parts and the bearing play, and avoid axial movement of the rotor. In general, a sealing glue is applied at the installation position of the wave-shaped elastic pad so that it can be positioned between the stator and the bearing. If the electric machine needs to be disassembled due to poor detection or use, it is difficult to disassemble due to the solidification of the sealing glue. SUMMARY

[0003] The present application aims to provide an electric machine and an electric machine end cover, which can eliminate axial tolerance and facilitate disassembly of the end cover, thereby facilitating disassembly of the rotor.

[0004] According to a first aspect of the present application, the present application provides an electric machine end cover, comprising:

[0005] an end cover body having a limiting hole arranged axially through;

[0006] a gland having a limiting structure on the outer circumferential side of the gland, the limiting structure being adapted to the limiting hole to limit the cooperation of the limiting hole, and the limiting hole having at least two limiting positions in the axial direction, the gland having a through hole arranged axially through, the through hole being used for the rotating shaft of the electric machine to pass through; the side of the gland facing the bearing of the rotor of the electric machine is further provided with an abutting portion, and the abutting portion is used for abutting with the outer ring of the bearing of the rotor of the electric machine.

[0007] In an embodiment, the limiting hole is a threaded hole, and the limiting structure is an external thread structure, which is used for limiting cooperation with the threaded hole.

[0008] In an embodiment, the limiting hole includes at least two limiting grooves arranged on the inner wall of the limiting hole, and the limiting structure is an elastic buckle, which is used for clamping and fixing with the limiting groove.

[0009] In an embodiment, the side of the gland opposite to the abutting portion is further provided with an oil seal groove, and the oil seal groove is arranged on the inner wall of the through hole around the rotating shaft of the electric machine.

[0010] In an embodiment, further comprising a sealing member arranged between the side of the gland facing the bearing of the rotor of the electric machine and the end cover body.

[0011] In an embodiment, the sealing member is a sealing ring, the gland further has a ring-shaped groove on a side of the gland facing the bearing of the motor rotor, and the ring-shaped groove is arranged on an outer circumferential side of the gland, and the sealing ring is installed in the ring-shaped groove and located between the gland and the end cover body.

[0012] In an embodiment, the abutting portion is a ring-shaped protrusion arranged on an end face of the gland on a side of the gland close to the bearing of the motor rotor.

[0013] In an embodiment, an outer circumferential side of the gland is further provided with a ring-shaped glue storage groove for storing sealing glue, and the glue storage groove is in communication with an outside of a side of the gland away from the bearing of the motor rotor when the abutting portion abuts against the bearing.

[0014] In an embodiment, a side of the gland away from the abutting portion is further provided with an auxiliary groove for adjusting the axial position of the gland by external force.

[0015] According to a second aspect of the present application, the present application provides a motor comprising the motor end cover.

[0016] According to the motor and the motor end cover of the above-mentioned embodiments, the gland and the end cover body are assembled by the limiting structure and the limiting hole, the axial installation position of the gland can be freely adjusted, thereby ensuring that the abutting portion abuts against the bearing, eliminating the axial tolerance of the parts and the bearing play, thereby preventing the axial movement of the rotor, the cooperation mode does not need to be glued between the end cover body and the bearing, thereby the gland can be quickly and detachably removed, so that when the stator or the rotor is detected to be defective during production or the stator or the rotor is faulty during use, the rotor can be easily removed. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 An exploded view of the motor provided by the present application;

[0018] Figure 2 A schematic view of the assembly of the gland in the motor end cover of the motor provided by the present application;

[0019] Figure 3 A perspective view of the motor provided by the present application;

[0020] Figure 4 A sectional view of the cooperation between the motor and the motor end cover in the first embodiment of the motor provided by the present application;

[0021] Figure 5 A sectional view of the cooperation between the motor and the motor end cover in the second embodiment of the motor provided by the present application;

[0022] Figure 6 A Figure 5 A local enlarged schematic view of position A in FIG. 8.

[0023] Figure 7 A cross-sectional view of the motor provided in the present application and the motor end cover in the third embodiment;

[0024] Figure 8 A cross-sectional view of the motor provided in the present application and the motor end cover in the fourth embodiment. Figure 7 A local enlarged view at B in the middle;

[0025] Figure 9 A cross-sectional view of the motor provided in the present application and the motor end cover in the fourth embodiment.

[0026] Reference signs:

[0027] End cover body 10, limiting hole 11, gland 20, auxiliary groove 201, limiting structure 21, via hole 22, abutting portion 23, oil seal groove 24, annular groove 25, glue storage groove 26, sealing member 30;

[0028] Motor 100, stator 101, installation cavity 1010, front end cover 1011, rotor 102, rotating shaft 1021, bearing 103, rear end cover 104, rear end cover body 1041, rear gland 1042. DETAILED DESCRIPTION

[0029] The present application will be further described in details through specific embodiments in combination with the drawings. In different embodiments, similar elements are marked with similar element reference numbers. In the following embodiments, many details are described in order to make the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different cases, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and it is not necessary to describe these related operations in detail for those skilled in the art according to the description in the specification and the general technical knowledge in the art.

[0030] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate way to form various embodiments, and the operation steps involved in each embodiment can also be sequentially adjusted or adjusted in a manner that can be easily apparent to those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing one embodiment, and do not mean that the composition and / or order is necessary.

[0031] The serial numbers of the components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified.

[0032] Reference Figures 1-4 As shown in the figure, in the related art, the motor 100 includes a stator 101, a rotor 102, two bearings 103, and a rear end cover 104, wherein the stator 101 has an installation cavity 1010 in the inside, the installation cavity 1010 is closed at one end and has an opening at the other end, the closed end of the stator 101 is formed as a front end cover 1011, the rotor 102 includes a rotating shaft 1021 and a rotor core sleeved on the side wall of the rotating shaft 1021, both ends of the rotating shaft 1021 extend out of the rotor core, the two bearings 103 are respectively installed at both ends of the rotating shaft 1021, the rotor 102 is installed in the installation cavity 1010 of the stator 101, and the rear end cover 104 is fixed at the opening of the installation cavity 1010 of the stator 101 by locking bolts 105.

[0033] Generally, both ends of the rotating shaft 1021 also respectively penetrate the rear end cover 104 and the front end cover 1011 to extend to the outside of the motor 100, facilitating assembly with other motion mechanisms such as gears, and the rear end cover 104 and the front end cover 1011 abut against the outer rings of the corresponding bearings 103. In the related art, a wave washer is also arranged between the corresponding bearing 103 and the rear end cover 104 and the front end cover 1011, which offsets the axial tolerance of the parts and the bearing play to prevent the rotor 102 from axially moving, improve the precision of the motor 100, and reduce noise. The wave washer is usually glued after installation to fix the wave washer at the corresponding installation position.

[0034] However, when the stator or the rotor is detected to be defective during production or fails during use, the rotor 102 needs to be disassembled, but the glue on the wave washer is difficult to remove after solidification, and the rotor 102 is inconvenient to disassemble.

[0035] To solve the above problems, the present application provides a motor and a motor end cover. The motor end cover includes an end cover body and a gland. The gland is fast-disassembly assembled with the end cover body, and abuts against the outer ring of the bearing by means of the abutting portion on the gland. The axial installation position of the gland can be freely adjusted, thereby ensuring that the abutting portion abuts against the bearing to offset the axial tolerance and the bearing play, thereby preventing the rotor from axially moving. This assembly method does not require gluing between the end cover body and the bearing, and the gland can be fast-disassembly removed, thereby facilitating the disassembly of the rotor when the stator or the rotor is detected to be defective during production or fails during use.

[0036] In the following embodiments, the motor end cover can be the front end cover 1011 or the rear end cover 103 of the motor 100, wherein the front end cover 1011 of the motor is an integral structure with the stator 101. Embodiment one

[0037] Referring to Figures 1-4 As shown in the drawings, the motor end cover provided by the present application comprises an end cover body 10 and a gland 20, wherein the end cover body 10 is located at the end of the stator 101 along the axial direction of the rotating shaft 1021 of the rotor 102 of the motor 100, and when the front end cover 1011 is adopted, the end cover body 10 is of an integrated structure with the stator 101, while when the rear end cover 103 is adopted, the end cover body 10 is installed at the opening of the installation cavity 1010 of the stator 101.

[0038] In the embodiment, the end cover body 10 is provided with an axial through limiting hole 11, which is preferably arranged at the middle part of the end cover body 10. The outer circumferential side of the gland 20 is provided with a limiting structure 21 matched with the limiting hole 11, which is used to limit the cooperation with the limiting hole 11. In the product assembly process, the gland 20 is fixedly connected to the end cover body 10 through the cooperation of the limiting structure 21 and the limiting hole 11.

[0039] It should be noted that the cooperation between the limiting structure 21 and the limiting hole 11 can realize the quick disassembly connection between the gland 20 and the end cover body 10, so as to facilitate the assembly and disassembly of the gland 20. For example, the two can be connected in a threaded connection, clamping or other ways, which will be described in subsequent embodiments.

[0040] The gland 20 is towards the bearing 103 installed on the rotating shaft 1021, and in order to enable one end of the rotating shaft 1021 to extend through the gland 20, in the embodiment, the gland 20 is provided with an axial through via hole 22, which is preferably arranged at the middle part of the gland 20, and the via hole 22 is used for the rotating shaft 1021 of the motor 100 to pass through, so that the rotating shaft 1021 extends to the outside of the motor 100 through the via hole 22.

[0041] After the product is assembled, as shown in Figure 4 The gland 20 is further provided with an abutting portion 23, which is arranged at the side of the gland 20 towards the bearing 103 of the rotor 102 of the motor 100, and the abutting portion 23 is used to abut against the outer ring of the bearing 103 of the rotor 102 of the motor 100.

[0042] The rotating shaft 1021 and the end cover have axial tolerance in the axial direction, and the bearing itself has bearing play. In the present application, the limiting hole 11 has at least two limiting positions in the axial direction, and when it is necessary to adjust the installation position of the bearing 103, the limiting structure 21 and the limiting hole 11 are matched on different limiting positions, so as to adjust the position of the gland 20, so that the gland 20 can change the position along the axial direction of the rotating shaft 1021, and then offset the axial tolerance of the parts and the bearing play by pushing the bearing 103, so as to prevent the rotor 102 from moving axially, improve the precision of the motor 100, and reduce the noise.

[0043] It should be noted that the at least two limiting positions of the limiting hole 11 arranged along the axial direction of the limiting hole 11 can change the position of the gland 20 along the axial direction of the limiting hole 11 when the limiting hole 11 cooperates with the limiting structure 21, and then the gland 20 can be moved towards the bearing 103 or away from the bearing 103, and when the gland 20 is moved towards the bearing 103, the axial tolerance of the parts and the bearing play can be offset in the manner of pushing the bearing 103, and when the gland 20 is moved away from the bearing 103, the gland 20 can be disassembled.

[0044] In an embodiment of the present application, the limiting hole 11 is a threaded hole arranged on the end cover body 10, and the limiting structure 21 is an external thread structure arranged on the outer circumferential side of the gland 20. The external thread structure and the threaded hole are screwed to cooperate to limit the gland 20.

[0045] In a specific embodiment, the gland 20 is moved towards the bearing 103 by screwing, so that the abutting portion 23 limits the bearing 103, and the bearing 103 is positioned at the corresponding position, that is, the axial tolerance of the parts and the bearing play can be offset under the action of the gland 20 to prevent the rotor 102 from moving axially.

[0046] It should be noted that the bearing 103 is positioned at the corresponding position, which is a position that can prevent the rotor 102 from moving axially, and the gland 20 abuts against the bearing 103 through the abutting portion 23 to position the corresponding position of the bearing 103, thereby preventing the rotor 102 from moving axially.

[0047] In another embodiment of the present application, the limiting hole 11 includes at least two limiting grooves arranged on the inner wall of the limiting hole 11, and the limiting structure 21 is an elastic buckle used for clamping and fixing with the limiting grooves. The at least two limiting grooves are arranged on the inner wall of the limiting hole 11 along the axial direction of the limiting hole 11, and when the gland 20 is installed, the elastic buckle can adjust the position of the gland 20 towards the bearing 103 or away from the bearing 103 by pushing and pulling the gland 20 along the axial direction of the limiting hole 11 according to the clamping cooperation with different limiting grooves.

[0048] It should be noted that the arrangement of the at least two limiting grooves can make the abutting portion 23 of the gland 20 abut against the outer ring of the bearing 103, and the positions of different limiting grooves make the installation positions of the gland 20 towards the bearing 103 different. When the elastic buckle is clamped and fixed with the limiting groove closest to the bearing 103, the abutting portion 23 of the gland 20 can be pressed on the outer ring of the bearing 103, thereby offsetting the axial tolerance of the parts and the bearing play to prevent the rotor 102 from moving axially.

[0049] In the present application, the abutment portion 23 usually abuts against the outer ring of the bearing 103, and in order to increase the contact area with the outer ring of the bearing 103, the abutment portion 23 is an annular protrusion, which is arranged on the end face of the pressure cover 20 on the side of the bearing 103 close to the rotor 102 of the motor 100. The abutment portion 23 of the annular protrusion can completely contact the outer ring of the bearing 103 to increase the contact area with the outer ring of the bearing 103.

[0050] When the rotating shaft 1021 extends to the outside of the motor 100 through the hole 22, there is a gap or clearance between the rotating shaft 1021 and the hole wall of the through hole 22. In this way, impurities such as water and debris can enter the installation cavity 1010 through the gap or clearance and affect the normal use of the rotor 102 and the stator 101. Therefore, it is necessary to seal the gap or clearance between the rotating shaft 1021 and the through hole 22. At the same time, it is necessary to ensure that the sealing effect is not affected when the rotating shaft 1021 rotates. The practice of this application is to use an oil seal on the rotating shaft 1021 and install the oil seal between the gap or clearance and the rotating shaft 1021.

[0051] In a specific embodiment, Figure 4 As shown, an oil seal groove 24 is further provided on the side of the pressure cover 20 facing away from the abutment portion 23. The oil seal groove 24 is arranged on the inner wall of the through hole 22 around the rotating shaft 1021 of the motor 100, and is preferably connected to the through hole 22 to form a step shape. The oil seal is installed in the oil seal groove 24 to seal the gap or clearance between the rotating shaft 1021 and the hole wall of the through hole 22.

[0052] The oil seal is typically an annular structure. After the oil seal is installed in the oil seal groove 24, the rotating shaft 1021 is inserted into the inner ring of the oil seal. The inner ring of the oil seal has an interference fit with the rotating shaft 1021, thereby achieving a sealing effect between the inner ring of the oil seal and the rotating shaft 1021. While ensuring rotation relative to the oil seal, it can also move axially relative to the oil seal. The outer ring of the oil seal has an interference fit with the oil seal groove 24, further achieving a sealing effect between the outer ring of the oil seal and the oil seal groove 24.

[0053] In the present application, the pressure cover 20 is installed on the end cover body 10 through the cooperation of the limiting structure 21 and the limiting hole 11. In order to facilitate the operation of the pressure cover 20 to achieve the cooperation between the limiting structure 21 and the limiting hole 11, an auxiliary groove 201 is also provided on the side of the pressure cover 20 facing away from the abutment 23. The auxiliary groove 201 is used to operate the pressure cover 20 with the help of external force so that the limiting structure 21 cooperates with the limiting hole 11, and the pressure cover 20 is fixedly installed on the end cover body 10.

[0054] In an embodiment, the limiting hole 11 and the limiting structure 21 are a threaded hole and an external threaded structure respectively, the gland 20 is mounted on the end cover body 10 in a way that the limiting structure 21 is screwed in the limiting hole 11, and the auxiliary groove 201 can be used to conveniently rotate the gland 20 by external force, so that the gland 20 can be locked on the end cover body 10 in a screwed way, or the gland 20 can be removed from the end cover body 10.

[0055] In some embodiments, two auxiliary grooves 201 are arranged on the side of the gland 20 away from the abutting portion 23, and the two auxiliary grooves are symmetrically arranged on the gland 20, a tool with two clamping protrusions can be clamped in the two auxiliary grooves, and the tool can be rotated to operate the rotation of the gland 20.

[0056] In another embodiment, the limiting hole 11 and the limiting structure 21 are a limiting slot and an elastic buckle respectively, the auxiliary groove 201 can be used to push and pull the gland 20 along the axial direction of the limiting hole 11 by external force, so that the elastic buckle can be clamped in different limiting slots, or the gland 20 can be removed from the end cover body 10.

[0057] In some embodiments, two auxiliary grooves 201 can also be arranged on the side of the gland 20 away from the abutting portion 23, so that the index finger and the thumb can be inserted into the two auxiliary grooves 201 to hold the gland 20, and the hand force can be used to push and pull the gland 20 along the axial direction of the limiting hole 11.

[0058] Compared with the way of adjusting the axial tolerance by using a wave washer in the related art, the way of using a threaded connection or a buckle connection has a larger range of adjusting the axial tolerance. Embodiment two

[0059] After the gland 20 is connected to the end cover body 10 in a way that the limiting structure 21 cooperates with the limiting hole 11, there is a certain gap between the gland 20 and the end cover body 10, which can make water and other impurities enter the installation cavity 1010 of the stator 101 through the gap, and then affect the normal use of the stator 101 and the rotor 102.

[0060] To solve the above problems, the motor end cover provided in the embodiment can seal the gap between the gland and the end cover body by using a sealing member.

[0061] Referring to FIGS. 1, 2 and 3, Figure 5 and Figure 6 The motor end cover provided in the embodiment further includes a sealing member 30 arranged between the side of the gland 20 facing the bearing 103 of the rotor 102 of the motor 100 and the end cover body 10.

[0062] In some embodiments, the cover 20 is connected to the cover body 10 by the cooperation of the limiting structure 21 and the limiting hole 11, and in order to avoid damage to the seal 30 when connecting, and because the abutting portion 23 is protruding on the cover 20, the seal 30 is arranged between the abutting portion 23 protruding on the cover 20 and the limiting hole 11 of the cover body 10.

[0063] In this embodiment, the seal 30 is a seal ring, for example, made of silica gel material, and the cover 20 is further provided with an annular groove 25 on the side facing the bearing 103 of the rotor 102 of the motor 100, and the annular groove 25 is arranged on the outer circumferential side of the cover 20, the seal ring 30 is installed in the annular groove 25 and located between the cover 20 and the cover body 10, thereby sealing the gap between the cover 20 and the cover body 10.

[0064] As shown in Figure 5 and Figure 6 , the abutting portion 23 is located in the inner ring of the annular groove 25. In a preferred embodiment, the abutting portion 23 of the annular protruding structure abuts the outer ring of the bearing 103 cooperating with the rotating shaft 1021 of the motor 100, and the annular groove 25 is arranged around the abutting portion 23 of the annular protruding structure. Embodiment Three

[0065] This embodiment provides a motor cover, which is different from the second embodiment in that the sealing method of the gap between the limiting structure 21 on the outer periphery of the cover 20 and the limiting hole 11 of the cover body 10 is different.

[0066] As shown in Figure 7 and Figure 8 , the outer circumferential side of the cover 20 is further provided with a circumferential storage groove 26 for storing sealant, which can be waterproof sealant. In other words, after the cover 20 is installed on the cover body 10 by the cooperation of the limiting structure 21 and the limiting hole 11, the sealant can be filled in the storage groove 26, and after the sealant solidifies, the gap between the limiting structure 21 on the outer periphery of the cover 20 and the limiting hole 11 of the cover body 10 can be sealed.

[0067] Here, it should be noted that the position of the storage groove 26 is away from the limiting structure 21 arranged on the outer periphery of the cover 20.

[0068] In this embodiment, the storage groove 26 is in communication with the outside of the side of the cover 20 away from the bearing 103 of the rotor 102 of the motor 100 when the abutting portion 23 abuts the bearing 103, wherein the outside of the side of the cover 20 away from the bearing 103 of the rotor 102 of the motor 100 is the outside of the motor 100, so that the sealant can be conveniently filled into the storage groove 26 from the outside of the motor 100. Embodiment Four

[0069] This embodiment provides a motor end cover, which is different from the above-mentioned embodiments 1 to 3 in that the motor end cover in this embodiment is the rear end cover of the motor.

[0070] See also Figure 9 As shown, the motor end cover includes a rear end cover body 1041 and a rear pressure cover 1042, wherein the rear end cover body 1041 is equivalent to the end cover body 10 in Examples 1 to 3, and the rear pressure cover 1042 is equivalent to the pressure cover 20 in Examples 1 to 3. The rear end cover body 1041 and the rear pressure cover 1042 are connected by screwing. For the specific structural features of the rear end cover body 1041 and the rear pressure cover 1042, please refer to the description in Examples 1 to 3, which will not be repeated here. Example 5

[0071] This embodiment provides a motor 100, including the motor end cover of the above-mentioned embodiment 1 to embodiment 4, see Figures 1-9 As shown, the motor 100 also includes a stator 101 and a rotor 102. The rotor 102 includes a rotating shaft 1021, a rotor core and two bearings 103. The stator 101 has an installation cavity 1010 inside. One end of the installation cavity 1010 is closed and the other end has an opening. The motor end cover provided in this embodiment can be formed as the closed end of the stator 101, or installed at the open end of the stator 101. The two bearings 103 are respectively installed at both ends of the rotating shaft 1021, and the rotor 102 with the bearings 103 installed at both ends is installed in the installation cavity 1010 of the stator 101. Both ends of the rotating shaft 1021 extend out of the rotor 102.

[0072] To sum up, in the motor and motor end cover provided by the present application, the pressure cover and the end cover body are assembled through the limiting structure and the limiting hole, and the abutment portion on the pressure cover is used to abut against the outer ring of the bearing to offset the axial tolerance of the parts and the bearing clearance, thereby preventing the axial movement of the rotor. This matching method does not require gluing between the end cover body and the bearing, and the pressure cover can be quickly removed or installed, so that when the stator or rotor is poorly detected during the production process or the stator or rotor fails during use, the rotor can be easily removed.

[0073] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art of the present invention can make some simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. An electric machine end cap characterized in that, The motor end cover comprises: an end cover body having an axial through limiting hole; a gland having a limiting structure on the outer circumferential surface thereof, which is adapted to the limiting hole and used to limit the position of the limiting hole, and the limiting hole has at least two limiting positions in the axial direction, the gland has an axial through through hole for the motor shaft to pass through, and the side of the gland facing the bearing of the motor rotor is further provided with an abutting portion used to abut against the outer ring of the bearing of the motor rotor.

2. The motor endshield of claim 1, wherein The limiting hole is a threaded hole, and the limiting structure is an external thread structure used to limit the position of the threaded hole.

3. The motor end cover according to claim 1, characterized in that: The limiting hole comprises at least two limiting grooves provided on the inner wall of the limiting hole, and the limiting structure is an elastic buckle used to be clamped and fixed with the limiting grooves.

4. The motor endshield of any one of claims 1-3, wherein, The side of the gland opposite to the abutting portion is further provided with an oil seal groove, which is arranged on the inner wall of the through hole around the motor shaft.

5. The motor endshield of any one of claims 1-3, wherein, Further comprising a sealing element arranged between the side of the gland facing the bearing of the motor rotor and the end cover body.

6. The motor endshield of claim 5, wherein the first and second endshield portions are formed from a single piece of material. The sealing element is a sealing ring, the side of the gland facing the bearing of the motor rotor is further provided with an annular groove, and the annular groove is arranged on the outer circumferential surface of the gland, the sealing ring is installed in the annular groove and located between the gland and the end cover body.

7. The motor endshield of any one of claims 1-3, wherein The abutting portion is an annular protrusion provided on the end face of the side of the gland close to the bearing of the motor rotor.

8. The motor endshield of any one of claims 1-3, wherein The outer circumferential surface of the gland is further provided with a surrounding storage groove for storing sealant, and the storage groove is in communication with the outside of the side of the gland opposite to the bearing of the motor rotor when the abutting portion abuts against the bearing.

9. The motor endshield of any one of claims 1-3, wherein The side of the gland opposite to the abutting portion is further provided with an auxiliary groove used to adjust the axial position of the gland by external force.

10. An electric machine characterized by The motor end cover comprises: an end cover body having an axial through limiting hole; a gland having a limiting structure on the outer circumferential surface thereof, which is adapted to the limiting hole and used to limit the position of the limiting hole, and the limiting hole has at least two limiting positions in the axial direction, the gland has an axial through through hole for the motor shaft to pass through, and the side of the gland facing the bearing of the motor rotor is further provided with an abutting portion used to abut against the outer ring of the bearing of the motor rotor. The limiting hole is a threaded hole, and the limiting structure is an external thread structure used to limit the position of the threaded hole. The limiting hole comprises at least two limiting grooves provided on the inner wall of the limiting hole, and the limiting structure is an elastic buckle used to be clamped and fixed with the limiting grooves. The side of the gland opposite to the abutting portion is further provided with an oil seal groove, which is arranged on the inner wall of the through hole around the motor shaft. Further comprising a sealing element arranged between the side of the gland facing the bearing of the motor rotor and the end cover body. The sealing element is a sealing ring, the side of the gland facing the bearing of the motor rotor is further provided with an annular groove, and the annular groove is arranged on the outer circumferential surface of the gland, the sealing ring is installed in the annular groove and located between the gland and the end cover body. The abutting portion is an annular protrusion provided on the end face of the side of the gland close to the bearing of the motor rotor. The outer circumferential surface of the gland is further provided with a surrounding storage groove for storing sealant, and the storage groove is in communication with the outside of the side of the gland opposite to the bearing of the motor rotor when the abutting portion abuts against the bearing. The side of the gland opposite to the abutting portion is further provided with an auxiliary groove used to adjust the axial position of the gland by external force.

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