Stator structure, motor and compressor

Abstract

The invention provides a stator structure, a motor and a compressor, the stator structure comprises a stator iron core and a shell, the stator iron core is arranged in the shell, an iron core cage is arranged on the stator iron core, and the stator iron core is connected with the shell through the iron core cage. According to the compressor, the technical problem that the iron core loss of the motor is obviously increased due to the fact that the stator iron core and the compressor shell are in interference fit in the prior art can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and in particular relates to a stator structure, a motor and a compressor. Background Art

[0002] See also Figure 1 As shown, the existing compressor motor assembly (see Figure 1 ) all adopt the method of shrink-fitting the stator core and the compressor housing. The stator core and the compressor housing are interference fit, and the interference fit will cause the compressor housing to generate radial compressive stress on the stator core. The direction of this compressive stress is the same as the magnetization direction of the stator core silicon steel sheet, which will cause the magnetic domains inside the silicon steel sheet parallel to the magnetic field direction to become fewer, and ultimately lead to a significant increase in the core loss of the motor. The loss of motor efficiency is very obvious. The test results show that the overall efficiency of the motor is reduced by nearly 1% after shrink-fitting, and it is reduced more at high frequencies; while the use of silicon steel sheet materials with smaller iron loss and higher cost alone can only improve the motor efficiency by less than 0.5%, that is, the effect of improving the efficiency of the compressor and solving the loss of motor efficiency is far more obvious than using better silicon steel sheet materials, and the cost is also lower.

[0003] The existing technologies all adopt the method of slotting the outer circle of the stator core to ensure the oil and gas flow requirements of the compressor. The straight up and down flow channels in the existing technologies are not conducive to the oil return of the compressor. The oil in the oil-gas mixture returns to the compressor oil pool, which easily causes the oil and gas to be discharged from the compressor together, resulting in reduced compressor performance and poor lubrication. At the same time, the outer circle slotting will reduce the width of the stator core yoke, increase the iron loss of the motor itself, and reduce the motor efficiency. The stator core is rigidly connected to the compressor housing, and the noise and vibration transmission are obvious.

[0004] Since the stator core and the compressor housing are interference fit in the prior art, there are technical problems such as significantly increased core loss of the motor, so the present invention studies and designs a stator structure, a motor, and a compressor. Summary of the invention

[0005] Therefore, the present invention provides a stator structure, a motor, and a compressor, which can solve the technical problem in the prior art that the stator core and the compressor housing are interference fit, resulting in a significant increase in the core loss of the motor.

[0006] In order to solve the above problems, the present invention provides a stator structure, including: a stator core and a shell, the stator core is arranged in the shell, a core cage is arranged on the stator core, and the stator core is connected to the shell through the core cage.

[0007] In some embodiments, the core cage includes an end plate, a plurality of axial ribs and a cover plate, the end plate and the cover plate are connected by a plurality of axial ribs, the axial ribs are arranged along the axial direction of the stator core, one end of the axial rib is connected to the end plate, and the other end of the axial rib is connected to the cover plate, the end plate is located at one end of the stator core, and the cover plate is located at the other end of the stator core.

[0008] In some embodiments, a plurality of first grooves are provided on the outer peripheral wall of the stator core along the axial direction of the stator core, the axial ribs correspond to the first grooves one by one, and the first grooves pass through both ends of the stator core.

[0009] In some embodiments, the axial rib has a clearance fit with the bottom surface of the first groove, the axial rib has a transition fit with the side wall of the first groove, and the core cage has a transition fit or a clearance fit with the inner wall of the shell.

[0010] In some embodiments, along the radial outward direction of the stator core, the axial rib is located on the outside of the end plate and the cover plate, one side of the axial rib is connected to the cover plate, and the other side of the axial rib is connected to a mounting ring, the mounting ring is located at the other end of the axial rib, and along the axial direction of the stator core, the inner circumferential wall of the mounting ring is provided with a plurality of second grooves.

[0011] In some embodiments, the inner diameter of the end plate is smaller than the outer diameter of the stator core, the outer diameter of the end plate is smaller than the inner diameter of the shell, the inner diameter of the mounting ring is not less than the outer diameter d1 of the stator core, and the axial rib has a middle part located between the end plate and the cover plate, and the outer circle d2 of the middle part is not larger than the shell.

[0012] In some embodiments, the distance between the mounting ring and the end plate is L1, the height of the stator core is L, and the thickness of the cover plate is L2, which satisfies L1≥L+L2.

[0013] In some embodiments, a first thread is provided on the axial rib, and a second thread is provided on the outer peripheral wall of the cover plate. The axial rib is threadedly connected to the cover plate through the first thread and the second thread. The rotation direction of the threaded connection between the axial rib and the cover plate is opposite to the rotation direction of the motor rotor.

[0014] In some embodiments, the shell and the axial ribs are connected by welding, and a plurality of the axial ribs are evenly arranged along the circumference of the stator core.

[0015] The present invention also provides a motor, comprising the above-mentioned stator structure.

[0016] The present invention also provides a compressor, comprising the above-mentioned motor.

[0017] In some embodiments, the compressor has an oil pool. When the axial rib is located on the outside of the end plate and the cover plate in the radial outward direction along the stator core, one side of the axial rib is connected to the cover plate, and the other side of the axial rib is connected to a mounting ring, the mounting ring is arranged close to the oil pool relative to the end plate.

[0018] A stator structure, a motor, and a compressor provided by the present invention have the following beneficial effects:

[0019] The stator core is separated from the shell by the core cage, so that the stator core will not be affected by radial compressive stress when the motor is assembled in the compressor, and the motor efficiency will not be lost, which can greatly improve the efficiency of the compressor. The test results show that the overall efficiency of the motor is reduced by nearly 1% after shrink-fitting, and it is reduced more at high frequencies; while the use of silicon steel sheet materials with lower iron loss and higher cost alone can only improve the motor efficiency by less than 0.5%. When the stator structure of the present invention is applied to a compressor, the effect of the stator structure of the present invention on improving the efficiency of the compressor is much higher than that of using new materials; the width of the stator yoke can also be increased to further reduce the iron loss of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] Figure 1 It is an assembly structure diagram of a stator core and a compressor housing in the prior art;

[0022] Figure 2 is an assembly structure diagram of the stator structure of the present invention;

[0023] Figure 3 The structure of the stator structure of the present invention is schematically shown in FIG. Figure 1 ;

[0024] Figure 4 Schematic diagram of the structure of the stator core in the stator structure of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the iron core cage in the stator structure of the present invention;

[0026] Figure 6 The structure of the stator structure of the present invention is schematically shown in FIG. Figure 2 ;

[0027] Figure 7 The structure of the stator structure of the present invention is schematically shown in FIG. Figure 3 ;

[0028] Figure 8 The structure of the stator structure of the present invention is schematically shown in FIG. Figure 4 ;

[0029] Fig. 9 is a partial enlarged view of the stator structure of the present invention;

[0030] Fig.10 The structure of the stator structure of the present invention is schematically shown in FIG. Figure 5 ;

[0031] Fig.11 The structure of the stator structure of the present invention is schematically shown in FIG. Figure 6 .

[0032] The accompanying drawings are marked as follows:

[0033] 1. stator core; 2. core cage; 3. housing; 4. welding hole; 5. end plate; 6. axial rib; 7. cover plate; 8. mounting ring; 9. first groove; 10. second thread; 11. first thread; 12. second groove. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0036] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0037] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0038] See also Figure 2-11 As shown, according to an embodiment of the present invention, a stator structure is provided, comprising: a stator core 1 and a housing 3, wherein the stator core 1 is arranged in the housing 3, and a core cage 2 is arranged on the stator core 1, and the stator core 1 is connected to the housing 3 through the core cage 2. In this technical solution, the stator core 1 is separated from the housing 3 by the core cage 2, so that the stator core will not be affected by radial compressive stress when the motor is assembled in the compressor, and the motor efficiency will not be lost, which can greatly improve the efficiency of the compressor. The test results show that the comprehensive efficiency of the motor is reduced by nearly 1% after the shrink sleeve, and the high frequency is reduced more; while the use of silicon steel sheet materials with lower iron loss and higher cost alone, the motor efficiency is improved by less than 0.5%. When the stator structure of the present invention is applied to the compressor, the effect of the stator structure of the present invention on the compressor efficiency is much higher than that of the new material; the width of the stator yoke can also be increased to further reduce the iron loss of the motor.

[0039] In some embodiments, the core cage 2 includes an end plate 5, a plurality of axial ribs 6 and a cover plate 7, the end plate 5 and the cover plate 7 are connected by a plurality of axial ribs 6, the axial ribs 6 are arranged along the axial direction of the stator core 1, one end of the axial rib 6 is connected to the end plate 5, the other end of the axial rib 6 is connected to the cover plate 7, the end plate 5 is located at one end of the stator core 1, and the cover plate 7 is located at the other end of the stator core 1. In this technical solution, the core cage 2 is formed by the end plate 5, the plurality of axial ribs 6 and the cover plate 7, which can not only separate the stator core 1 from the housing 3, so that the stator core will not be affected by radial compressive stress when the motor is assembled in the compressor, but also form a flow channel between the inner circumferential wall of the housing 3 and the stator core 1. When the stator structure of the present invention is applied to a compressor, the oil channel flow area of ​​the compressor is greatly increased, and the oil return and lubrication efficiency of the compressor are improved.

[0040] In some embodiments, along the axial direction of the stator core 1 , a plurality of first grooves 9 are provided on the outer peripheral wall of the stator core 1 , the axial ribs 6 correspond to the first grooves 9 one by one, and the first grooves 9 pass through both ends of the stator core 1 .

[0041] In the stator structure of the present invention, the core cage 2 is divided into a cover plate 7, an axial rib 6, an end plate 5, and a mounting ring 8. The end plate 5 and the mounting ring 8 are connected by the axial rib. The outer circle of the cover plate 7 is provided with a thread, and the inner side of the axial rib 6 at the end of the mounting ring 8 is provided with a thread matching the outer circle of the cover plate 7; a first groove 9 matching the axial rib 6 is provided at the outer circle of the stator core 1, one end of the stator core 1 is placed on the end plate 5, the first groove 9 cooperates with the axial rib 6, and the other end of the stator core 1 is pressed by the cover plate 7, and is tightened by threads after being pressed; the core cage 2 is assembled and welded to the inner circle of the compressor housing only at the outer circle parts at both ends.

[0042] In some embodiments, the axial rib 6 has a clearance fit with the bottom surface of the first groove 9, the axial rib 6 has a transition fit with the side wall of the first groove 9, and the core cage 2 has a transition fit or a clearance fit with the inner wall of the housing 3. In this technical solution, the inner circle of the axial rib 6 has a clearance fit with the bottom of the first groove 9, so that the axial rib 6 will not generate compressive stress on the stator core 1 in the radial direction, and the side wall of the axial rib 6 and the side wall of the first groove 9 have a transition fit to ensure that there is no skewing in the circumferential direction of the stator; the outer circle of the core cage has a transition fit or a clearance fit with the inner circle of the compressor housing, further ensuring that the housing will not generate compressive stress on the stator core in the radial direction.

[0043] In some embodiments, along the radial outward direction of the stator core 1, the axial rib 6 is located on the outer side of the end plate 5 and the cover plate 7, one side of the axial rib 6 is connected to the cover plate 7, and the other side of the axial rib 6 is connected to a mounting ring 8, and the mounting ring 8 is located at the other end of the axial rib 6. Along the axial direction of the stator core 1, a plurality of second grooves 12 are provided on the inner circumferential wall of the mounting ring 8. In this technical solution, through the second grooves 12, when the stator structure of the present invention is applied to a compressor, the outer circle of the axial rib 6 is assembled with the inner circle of the compressor housing 3, so that a flow channel is formed between the second grooves 12, the end plate 5 and the housing 3; the outer circle d2 of the middle part of the axial rib 6 is not larger than the inner diameter of the compressor housing 3, so that the flow area between the middle section of the motor and the compressor housing 3 can be adjusted by adjusting the size of d2. Compared with the flow of only axial fixed area in the prior art, the radial flow area can be adjusted here.

[0044] In some embodiments, the inner diameter of the end plate 5 is smaller than the outer diameter of the stator core 1, the outer diameter of the end plate 5 is smaller than the inner diameter of the housing 3, the inner diameter of the mounting ring 8 is not smaller than the outer diameter d1 of the stator core 1, and the axial rib 6 has a middle part located between the end plate 5 and the cover plate 7, and the outer circle d2 of the middle part is not larger than the housing 3. In this technical solution, the end plate 5 is located on the inner side of the axial rib 6, the inner diameter of the end plate 5 is smaller than the outer diameter of the stator core 1, so that the end plate 5 can support the stator core 1, the outer diameter of the end plate 5 is smaller than the inner diameter of the compressor housing 3, the outer circle of the axial rib 6 is assembled with the inner circle of the compressor housing 3, so that a flow hole is formed between the end plate 5 and the housing 3; the stator is assembled with the housing 3 through the outer circle of the axial rib 6 on the side of the end plate 5 and the outer circle of the side ring of the mounting ring 8, so that the installation of the motor and the housing is completed. The outer circle d2 of the middle section of the axial rib 6 is not larger than the inner diameter of the compressor housing 3. In this way, the flow area between the middle section of the motor and the compressor housing can be adjusted by adjusting the size of d2. Compared with the existing technology that only has a fixed axial flow area, the radial flow area can be adjusted here.

[0045] In some embodiments, the distance between the mounting ring 8 and the end plate 5 is L1, the height of the stator core 1 is L, and the thickness of the cover plate 7 is L2, which satisfies L1≥L+L2. In this technical solution, the distance between the mounting ring 8 and the end plate 5 is L1, the height of the stator core 1 is L, and the thickness of the cover plate 7 is L2, which satisfies L1≥L+L2, thereby ensuring that an adjustable flow area is formed between the mounting ring 8 and the cover plate 7 in the axial direction.

[0046] In some embodiments, the axial rib 6 is provided with a first thread 11, and the outer peripheral wall of the cover plate 7 is provided with a second thread 10. The axial rib 6 and the cover plate 7 are threadedly connected through the first thread 11 and the second thread 10, and the rotation direction of the threaded connection between the axial rib 6 and the cover plate 7 is opposite to the direction of rotation of the motor rotor. In this technical solution, when viewed from the core cage ring side, the tightening direction of the cover plate 7 is opposite to the direction of rotation of the motor rotor. When the motor rotor rotates, the stator will be subjected to a force in the opposite direction. The tightening direction of the cover plate 7 is opposite to the direction of rotation of the rotor and the same as the force direction of the stator. The direct static friction between the stator core 1 and the cover plate 7 is the same as the tightening direction of the cover plate. In this way, the static friction force on the cover plate 7 can make the cover plate tighten tighter and will not fail. Furthermore, the assembly method of the cover plate 7 and the axial rib 6 can also be changed to a method in which the cover plate 7 is pressed and welded to the axial rib 6.

[0047] In some embodiments, the housing 3 is connected to the axial ribs 6 by welding, and the plurality of axial ribs 6 are evenly arranged along the circumference of the stator core 1. In this technical solution, a plurality of welding holes 4 are provided on the housing 3, each welding hole 4 corresponds to a welding spot, the welding spot on the side of the end plate 5 is located outside the axial ribs 6, the welding spot on the side of the mounting ring 8 is located on the outer circle of the mounting ring 8 corresponding to the axial ribs 6, and the welding spots are all higher than the stator core 1 in the axial direction, that is, d3>0, d4>0, that is, in the axial direction, the position of the welding spot is ensured to be staggered with the stator core 1, reducing the influence of welding on the stator core, and the number of welding spots on each side is equal to the number of axial ribs 6; both ends of the core cage 2 have first grooves 9 on the inner diameter side of the welding spot, and the number of the first grooves 9 is equal to the number of welding spots, so that each welding spot can be ensured to have an air groove inside, further reducing the high temperature generated by welding from being transmitted to the core, because the motor and the housing are only in contact at the welding spot position, the elastic connection at the air groove can reduce the vibration and noise of the motor from being transmitted to the compressor.

[0048] The stator structure of the present invention is not subject to radial compressive stress, and there will be no efficiency loss after the motor is installed in the compressor, and the efficiency of the compressor is significantly improved; there is no need to open a large groove on the outer circle of the stator core, and the outer diameter of the stator core is smaller than the inner diameter of the shell, the flow area can be designed to be larger, and the yoke of the stator core can be more uniform and wider, the iron loss of the motor itself is reduced, and the efficiency is improved; the three-dimensional flow hole with adjustable flow area can effectively improve the oil return capacity of the compressor and realize low-cost adjustment of the flow area to meet the flow area requirements of the compressor as needed; the rigidity of the motor and the compressor is improved, and the vibration and noise of the compressor are effectively reduced from the transmission path.

[0049] The present invention also provides a motor, comprising the above-mentioned stator structure.

[0050] The motor of the present invention can increase the width of the stator yoke and further reduce the iron loss of the motor; the designed funnel-shaped three-dimensional flow channel can not only increase the flow area of ​​the motor, but also adjust the flow area without changing the iron core, and can also effectively reduce the lubricating oil discharged from the compressor with the gas, improve the oil return capacity of the compressor, and help improve the performance and reliability of the compressor; after the motor and the compressor housing are assembled, the welding point has an elastic connection design, which can effectively reduce the transmission of motor vibration to the compressor as a whole, and reduce the vibration and noise of the compressor. It can also greatly reduce the efficiency loss of the compressor motor and improve the energy efficiency of the compressor; increase the width of the stator core yoke, reduce the iron loss of the motor itself, and improve the efficiency of the motor; the new adjustable flow channel effectively improves the performance and reliability of the compressor; and effectively reduces the vibration and noise of the compressor.

[0051] The present invention also provides a compressor, comprising the above-mentioned motor.

[0052] In some embodiments, the compressor has an oil pool, and when the axial rib 6 is located outside the end plate 5 and the cover plate 7 in the radially outward direction along the stator core 1, one side of the axial rib 6 is connected to the cover plate 7, and the other side of the axial rib 6 is connected to the mounting ring 8, the mounting ring 8 is arranged close to the oil pool relative to the end plate 5. In this technical solution, one side of the mounting ring 8 is close to the compressor oil pool, and the end plate 5 side is far away from the compressor oil pool, so that a funnel-shaped flow hole with adjustable lower part will be formed in the motor part, so that the oil in the oil-gas mixture discharged by the compressor pump can return to the oil pool more easily and it is difficult to flow out of the compressor against the funnel-shaped flow hole, thereby improving the oil return capacity of the compressor.

[0053] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A stator structure, characterized in that: include: A stator core (1) and a housing (3), wherein the stator core (1) is arranged in the housing (3), an iron core cage (2) is arranged on the stator core (1), and the stator core (1) is connected to the housing (3) via the iron core cage (2).

2. The stator structure according to claim 1, characterized in that: The core cage (2) comprises an end plate (5), a plurality of axial ribs (6) and a cover plate (7); the end plate (5) and the cover plate (7) are connected via the plurality of axial ribs (6); the axial ribs (6) are arranged along the axial direction of the stator core (1); one end of the axial rib (6) is connected to the end plate (5); the other end of the axial rib (6) is connected to the cover plate (7); the end plate (5) is located at one end of the stator core (1); and the cover plate (7) is located at the other end of the stator core (1).

3. The stator structure according to claim 2, characterized in that: Along the axial direction of the stator core (1), a plurality of first grooves (9) are arranged on the outer peripheral wall of the stator core (1), the axial ribs (6) correspond to the first grooves (9) one by one, and the first grooves (9) pass through both ends of the stator core (1).

4. The stator structure according to claim 3, characterized in that: The axial rib (6) has a clearance fit with the bottom surface of the first groove (9), the axial rib (6) has a transition fit with the side wall of the first groove (9), and the core cage (2) has a transition fit or a clearance fit with the inner wall of the shell (3).

5. The stator structure according to claim 2, characterized in that: Along the radial outward direction of the stator core (1), the axial rib (6) is located on the outer side of the end plate (5) and the cover plate (7); one side of the axial rib (6) is connected to the cover plate (7); the other side of the axial rib (6) is connected to a mounting ring (8); the mounting ring (8) is located at the other end of the axial rib (6); and along the axial direction of the stator core (1), a plurality of second grooves (12) are provided on the inner circumferential wall of the mounting ring (8).

6. The stator structure according to claim 5, characterized in that: The inner diameter of the end plate (5) is smaller than the outer diameter of the stator core (1), the outer diameter of the end plate (5) is smaller than the inner diameter of the housing (3), the inner diameter of the mounting ring (8) is not smaller than the outer diameter d1 of the stator core (1), and the axial rib (6) has a middle portion located between the end plate (5) and the cover plate (7), and the outer circle d2 of the middle portion is not larger than the housing (3).

7. The stator structure according to claim 5, characterized in that: The distance between the mounting ring (8) and the end plate (5) is L1, the height of the stator core (1) is L, and the thickness of the cover plate (7) is L2, which satisfies the condition that L1≥L+L2.

8. The stator structure according to claim 2, characterized in that: The axial rib (6) is provided with a first thread (11), and the outer peripheral wall of the cover plate (7) is provided with a second thread (10); the axial rib (6) and the cover plate (7) are threadedly connected via the first thread (11) and the second thread (10); and the rotation direction of the threaded connection between the axial rib (6) and the cover plate (7) is opposite to the rotation direction of the motor rotor.

9. The stator structure according to claim 2, characterized in that: The housing (3) and the axial ribs (6) are connected by welding, and a plurality of the axial ribs (6) are evenly arranged along the circumference of the stator core (1).

10. A motor, characterized in that: The invention comprises the stator structure according to any one of claims 1 to 9.

11. A compressor, characterized in that: The motor comprising the motor described in claim 10.

12. The compressor according to claim 12, characterized in that: The compressor has an oil pool. When the axial rib (6) is located on the outside of the end plate (5) and the cover plate (7) in the radial outward direction along the stator core (1), one side of the axial rib (6) is connected to the cover plate (7), and the other side of the axial rib (6) is connected to a mounting ring (8), the mounting ring (8) is arranged close to the oil pool relative to the end plate (5).

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