Integrated bearing unit of motor

Abstract

The utility model discloses an integrated bearing unit of a motor, which relates to the technical field of motor bearings and comprises a bearing inner ring, a bearing outer ring and a bearing inner ring, the bearing outer ring is arranged on the circumferential outer side of the bearing inner ring, a bearing flange is integrated on the bearing outer ring, and the bearing flange is connected with the motor end cover through a bolt; the inner side part of the grease storage cover plate is connected with the bearing inner ring, the outer side part of the grease storage cover plate is connected with the bearing outer ring, and a grease storage chamber is formed among the bearing inner ring, the bearing outer ring and the grease storage cover plate. The integrated bearing unit solves the technical problems that an existing motor open type bearing is provided with a large number of parts, installation and disassembly are complex, the occupied axial space size of the motor is large, and the weight of the motor is heavy. The bearing inner ring, the bearing outer ring, the grease storage cover plate and the bearing flange are integrated, so that the bearing is simple and compact in overall structure and simple and convenient to mount, dismount and maintain, the axial space of the motor is effectively saved, the space size and weight of the motor are reduced, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor bearing technical field, especially relate to a motor integrated bearing unit. BACKGROUND

[0002] Bearing is an important component of motor, it is mainly used for supporting motor rotor to ensure its normal smooth high speed rotation, and bearing operation state is directly influenced the normal use of motor. However, with the development of motor towards high power density, long life, maintenance free, open bearing configuration has been unable to meet the development needs, becomes the key factor restricting its development.

[0003] At present, the motor bearing configuration disclosed by prior art is all open bearing configuration, generally is composed of bearing seat, sealing gasket, inner grease storage chamber, outer grease storage chamber, inner oil seal and outer oil seal and other parts, involves many parts, and when installing and disassembling, it is relatively complex, and the occupied motor axial space size is relatively large, resulting in large motor space size and weight, high production cost. On the other hand, the existing motor bearing is a single component, that is, the transmission end and non transmission end bearing unit of motor is open bearing configuration, needs to supplement lubricating grease to bearing through grease supplementing channel regularly, so as to realize good lubrication of bearing, and lifelong maintenance free of bearing cannot be realized. Therefore, the motor integrated bearing unit for solving the above problems is proposed. UTILITY MODEL CONTENTS

[0004] The main purpose of the utility model is to provide a motor integrated bearing unit, which solves the technical problems of the existing motor parts, complex installation and disassembly, large occupied motor axial space size, large motor space size and weight, and high production cost.

[0005] To achieve the above purpose, the utility model provides a motor integrated bearing unit, which comprises:

[0006] Motor rotating shaft;

[0007] Bearing inner ring, which is sleeved and arranged on the circumferential outer side of the motor rotating shaft, and the bearing inner ring is in interference fit with the motor rotating shaft;

[0008] Bearing outer ring, which is arranged on the circumferential outer side of the bearing inner ring, and the bearing outer ring is provided with a rolling track at the connection position of the bearing inner ring, the rolling track is provided with an insulating rolling body, and the circumferential outer side of the bearing outer ring is integrally provided with a bearing flange, and the bearing flange is connected with a motor end cover through a plurality of first bolts;

[0009] A grease storage cover plate, an inner side of the grease storage cover plate is connected with the bearing inner ring, the bearing inner ring is rotatable relative to the grease storage cover plate, an outer side of the grease storage cover plate is connected with the bearing outer ring, a grease storage chamber is formed among the bearing inner ring, the bearing outer ring and the grease storage cover plate, the grease storage chamber is filled with lubricating grease, and the grease storage chamber is communicated with the rolling track.

[0010] Preferably, the end face of the bearing outer ring is arranged with a plurality of flange holes, the outer side of the grease storage cover plate is arranged with a plurality of through holes, and a second bolt passes through the through holes to connect the flange holes, so as to connect the grease storage cover plate to the end face of the bearing outer ring.

[0011] Preferably, the inner circumferential side of the bearing outer ring is provided with a first annular stepped groove, and the side of the outer side of the grease storage cover plate facing the bearing inner ring is provided with an annular connecting portion, and the outer circumferential side of the annular connecting portion is in interference fit with the inner circumferential side of the first annular stepped groove.

[0012] Preferably, the end face of the bearing outer ring is integrally provided with an annular protrusion, and the side of the outer side of the grease storage cover plate facing the bearing inner ring is provided with an annular connecting portion, and the inner circumferential side of the annular connecting portion is in interference fit with the outer circumferential side of the annular protrusion.

[0013] Preferably, the two end faces of the bearing inner ring are provided with a plurality of labyrinth grooves, and the side of the inner side of the grease storage cover plate facing the bearing inner ring is provided with a clamping portion, and the clamping portion is rotatably connected with the labyrinth grooves.

[0014] Preferably, the inner side of the grease storage cover plate is integrated with a sealing lip, the outer circumferential side of the bearing inner ring is provided with a second annular stepped groove, the outer side of the sealing lip abuts against the second annular stepped groove to form a light-contact lip seal, and the sealing lip is rotatably connected with the second annular stepped groove.

[0015] Preferably, the inner circumferential side of the bearing outer ring is provided with a first assembly groove, and the outer circumferential side of the bearing inner ring is provided with a second assembly groove, and the first assembly groove and the second assembly groove are combined to form the rolling track.

[0016] Preferably, the insulating rolling body is in one of a spherical shape, a cylindrical shape or a conical shape.

[0017] Preferably, a retainer is arranged in the rolling track, and the insulating rolling body is arranged on the retainer.

[0018] Preferably, the outer circumferential side of the motor rotating shaft is provided with a shaft shoulder and a plurality of positioning nuts, and the shaft shoulder and the plurality of positioning nuts respectively abut against the two end faces of the bearing inner ring to axially position the bearing inner ring.

[0019] With respect to the prior art, the motor integrated bearing unit has the following beneficial effects: the bearing inner ring, the bearing outer ring, the insulating rolling body, the retainer, the grease storage cover plate, the bearing flange and the lubricating grease are integrated, the bearing has a simple and compact overall structure, the bearing can be directly assembled to the motor end cover, the axial space of the motor is effectively saved, the space size and weight of the motor are reduced, and thus the production cost of the motor is reduced, the bearing is more convenient to install and disassemble, and bearing maintenance and replacement can be realized in a disassembly-free state of the motor. On the other hand, the grease storage cover plate is arranged at both ends of the bearing, the grease storage chamber is formed by the bearing inner ring, the bearing outer ring and the grease storage cover plate, the lubricating grease filled in the grease storage chamber can be provided in real time to the connecting position of the bearing inner ring and the bearing outer ring, so that the bearing is well lubricated, the lubricating grease does not need to be supplemented to the bearing regularly, the insulating rolling body has good anti-electric corrosion capability, the electric corrosion phenomenon of the bearing during operation can be effectively prevented, the service life of the bearing is further prolonged, and lifelong maintenance-free of the bearing is realized. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0021] Figure 1 A perspective view of the motor integrated bearing unit provided by the preferred embodiment of the present application is shown in the figure.

[0022] Figure 2 A side view of the motor integrated bearing unit provided by the preferred embodiment of the present application is shown in the figure.

[0023] Figure 3 A partial cross-sectional view of the motor integrated bearing unit provided by the preferred embodiment of the present application is shown in the figure.

[0024] Figure 4 A partial cross-sectional view of the motor integrated bearing unit provided by the second embodiment of the present application is shown in the figure.

[0025] Figure 5 A partial cross-sectional view of the motor integrated bearing unit provided by the third embodiment of the present application is shown in the figure.

[0026] Figure 6 A partial cross-sectional view of the motor integrated bearing unit provided by the fourth embodiment of the present application is shown in the figure.

[0027] Figure 7The utility model discloses a partial section schematic view of the motor integrated bearing unit provided by the fifth embodiment of the utility model.

[0028] Figure 8 The utility model discloses a partial section schematic view of the motor integrated bearing unit provided by the sixth embodiment of the utility model.

[0029] Specifically, 1-motor rotating shaft;2-bearing inner ring;3-bearing outer ring;4-insulating rolling body;5-lip storage cover plate;6-lip storage chamber;7-retainer;8-first annular stepped groove;9-annular connecting portion;10-annular protrusion;11-labyrinth groove;12-clamping portion;13-sealing lip;14-second annular stepped groove;15-bearing flange;16-motor end cover;17-positioning nut;18-shoulder. Specific embodiments

[0030] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the utility model.

[0031] In order to make those skilled in the art better understand the utility model scheme, the utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0032] As Figure 1 And Figure 2 As shown in the utility model provides a kind of motor integrated bearing unit to achieve the above-mentioned purpose, it include: bearing inner ring 2, bearing outer ring 3 and lip storage cover plate 5, insulating rolling body 4, retainer 7 and lubricating grease.

[0033] Wherein, bearing inner ring 2 is sleeved and is arranged at the circumferential outside of motor rotating shaft 1, bearing inner ring 2 rotates synchronously with motor rotating shaft 1, and bearing inner ring 2 is interference fit with motor rotating shaft 1, to ensure that motor rotating shaft 1 and bearing inner ring 2 between mutual friction phenomenon does not appear, to protect motor rotating shaft 1.

[0034] The bearing inner ring 2 is provided with a bearing outer ring 3 on the outer side in the circumferential direction, the bearing outer ring 3 can rotate freely relative to the bearing inner ring 2, the bearing outer ring 3 is provided with a rolling track at the joint position with the bearing inner ring 2, the rolling track is provided with an insulating rolling body, and the two end faces of the bearing inner ring 2 and the two end faces of the bearing outer ring 3 are connected with a grease storage cover plate 5. Specifically, the outer side of the grease storage cover plate 5 is connected with the bearing outer ring 3, a grease storage chamber 6 is formed between the bearing inner ring 2, the bearing outer ring 3 and the grease storage cover plate 5, the grease storage chamber 6 is filled with lubricating grease, and the grease storage chamber 6 is communicated with the rolling track. The lubricating grease filled in the grease storage chamber 6 is provided in real time at the joint position of the bearing inner ring 2 and the bearing outer ring 3, so as to realize good lubrication of the bearing, and the lubricating grease does not need to be supplemented to the bearing regularly. At the same time, the insulating rolling body 4 has good anti-electric corrosion capability, so as to effectively prevent the electric corrosion phenomenon of the bearing during operation, further prolong the service life of the bearing, and realize lifelong maintenance-free of the bearing.

[0035] The bearing flange 15 is integrally arranged on the outer side in the circumferential direction of the bearing outer ring 3, the side surface of the bearing flange 15 is arrayed with a plurality of bolt holes, the bolt holes are threadedly connected with first bolts, the bearing outer ring 3 is assembled on the motor end cover 16 through the first bolts, and the bearing outer ring 3 is fixed and stationary relative to the motor end cover 16. At the same time, the bearing inner ring 2 and the bearing outer ring 3 are connected with the grease storage cover plate 5, and the bearing inner ring 2 is rotatably connected with the grease storage cover plate 5. By integrating the bearing inner ring 2, the bearing outer ring 3, the insulating rolling body 4, the retainer 7, the grease storage cover plate 5 and the bearing flange 15, the bearing can be directly assembled on the motor end cover, compared with the existing motor bearing, the bearing seat, the sealing gasket, the inner oil seal, the outer oil seal and other components are omitted, so that the overall structure of the bearing is simple and compact, the axial space of the motor is effectively saved, the space size and weight of the motor are reduced, the production cost of the motor is reduced, and the bearing is more convenient to install and disassemble, so that the bearing maintenance and replacement can be realized under the condition that the motor is not disassembled.

[0036] Preferably, the grease storage cover plate 5 is in a C shape as a whole, and the opening of the grease storage cover plate 5 faces the bearing inner ring 2, so as to maximize the volume of the grease storage chamber 6 formed by the grease storage cover plate 5, the bearing inner ring 2 and the bearing outer ring 3, thereby storing more lubricating grease and further improving the service life of the bearing. On the other hand, the side surface of the grease storage cover plate 5 away from the bearing inner ring 2 is concave to the end face of the bearing inner ring 2, so as to ensure that the arrangement of the grease storage cover plate 5 does not increase the overall axial length of the bearing, and further makes the overall structure of the bearing simple and compact, thereby saving the axial space of the motor.

[0037] As shown in FIG. 1, the bearing inner ring 2 is provided with a plurality of rolling tracks 4, and the rolling tracks 4 are arranged in the circumferential direction of the bearing inner ring 2. Figure 3 and Figure 4As shown, in one embodiment of this utility model, the end face of the bearing outer ring 3 is provided with a plurality of flange holes, and the outer side of the grease reservoir cover 5 is provided with a plurality of through holes. Each second bolt passes through the through hole and connects to the flange hole to connect the grease reservoir cover 5 to the end face of the bearing outer ring 3. In addition, the two end faces of the bearing inner ring 2 are provided with a plurality of labyrinth grooves 11. Preferably, the two end faces of the bearing inner ring 2 are provided with one labyrinth groove 11. The inner side of the grease reservoir cover 5 facing the bearing inner ring 2 is provided with a snap-fit ​​part 12. The snap-fit ​​part 12 is rotatably connected to the labyrinth groove 11. The grease reservoir cover 5 is sealed to the bearing inner ring 2 by the cooperation of the snap-fit ​​part 12 and the labyrinth groove 11. The bearing inner ring 2 is rotatable relative to the grease reservoir cover 5. The grease reservoir cover 5 is used to seal the bearing outer ring 3, forming a grease reservoir 6, and effectively sealing the grease in the grease reservoir 6. It should be noted that the inner part of the grease reservoir cover 5 is located on the outer periphery of the grease reservoir cover 5 near its axial center, while the inner part of the grease reservoir cover 5 is located on the inner periphery of the grease reservoir cover 5 away from its axial center. By creating grooves in the bearing's inner ring components, a labyrinth seal is formed with the grease reservoir cover, eliminating the need for additional components to form a seal. This further simplifies and compacts the overall bearing structure, saving axial space in the motor.

[0038] Of course, two or more labyrinth grooves 11 can also be provided on both end faces of the inner ring 2 of the bearing, such as... Figure 8 As shown, the inner side of the grease reservoir cover 5 facing the inner ring 2 of the bearing is provided with a snap-fit ​​part 12 corresponding to the number of labyrinth grooves 11. Each snap-fit ​​part 12 is rotatably connected to a labyrinth groove 11. The corresponding labyrinth grooves 11 are sealed and connected by multiple snap-fit ​​parts 12, which further enhances the sealing strength between the grease reservoir cover 5 and the inner ring 2 of the bearing. At the same time, it cooperates with the grease reservoir cover 5 to seal and connect the outer ring 3 of the bearing, forming a grease reservoir 6, which seals the grease in the grease reservoir 6.

[0039] It should be noted that the engagement part 12 and the labyrinth groove 11 are used to assemble the bearing inner ring 2 and the grease reservoir cover 5 to form a non-contact gap labyrinth seal. On the one hand, this can prevent grease leakage and contaminants from entering the bearing. On the other hand, it can reduce bearing friction and heat generation and improve the bearing's high-speed operation performance.

[0040] like Figure 5 As shown, in one embodiment of the present invention, a first annular stepped groove 8 is provided on the inner circumferential side of the outer ring 3 of the bearing, and an annular connecting part 9 is provided on the outer side of the grease reservoir 5 facing the inner ring 2 of the bearing. The outer circumferential side of the annular connecting part 9 is interference-fitted with the inner circumferential side of the first annular stepped groove 8 to connect the grease reservoir 5 to the end face of the outer ring 3 of the bearing. The grease reservoir 5 seals the inner ring 2 of the bearing to form a grease reservoir 6, which seals the grease in the grease reservoir 6. The inner ring 2 of the bearing is rotatable relative to the grease reservoir 5.

[0041] likeFigure 6 As shown in the utility model, one embodiment of the utility model, the end surface of bearing outer ring 3 integral setting annular protruding 10, the outer side of grease storage cover plate 5 towards the side of bearing inner ring 2 setting annular connecting portion 9, the inner circumferential side surface of annular connecting portion 9 and the outer circumferential side surface of annular protruding 10 interference fit, to connect grease storage cover plate 5 in the end surface of bearing outer ring 3, cooperate grease storage cover plate 5 sealed connection bearing inner ring 2, form grease storage chamber 6, seal the lubricating grease in grease storage chamber 6, wherein, bearing inner ring 2 relative grease storage cover plate 5 rotatable.

[0042] As shown in the utility model, one embodiment of the utility model, the inner side of grease storage cover plate 5 integrates sealing lip 13, the outer circumferential side surface of bearing inner ring 2 sets up second annular stepped groove 14, and second annular stepped groove 14 replaces labyrinth groove 11, and the outer side of sealing lip 13 abuts against second annular stepped groove 14 to form light contact type lip seal, and sealing lip 13 is rotatably connected with second annular stepped groove 14, and sealing lip 13 cooperates with bearing inner ring 2 to form light contact type lip seal, so that the sealing effect is better, and the lubricating grease leakage and the contamination into the bearing interior are better prevented, and the service life of the bearing is improved. Figure 7

[0043] The inner circumferential side surface of bearing outer ring 3 is provided with a first assembly groove, and the outer circumferential side surface of bearing inner ring 2 is provided with a second assembly groove, and the first assembly groove and the second assembly groove are combined to form a rolling track, the rolling track is annular in shape, and the lubricating grease in the grease storage chamber 6 enters the rolling track to lubricate the insulating rolling body 4, ensuring the use effect of the bearing, preferably, the insulating rolling body 4 is made of ceramic material, and the advantage that the ceramic material has good anti-electric corrosion ability is fully utilized.

[0044] In addition, a matching groove is arranged in the first assembly groove and the second assembly groove, and the matching groove is used for positioning and installing the insulating rolling body 4, so that the insulating rolling body 4 always stably operates in the rolling track, and it should be noted that the insulating rolling body 4 is in any one of a spherical shape, a cylindrical shape or a conical shape, and the matching groove is designed according to the shape of the insulating rolling body 4, so that the matching groove and the insulating rolling body 4 are stably matched.

[0045] In one embodiment of the utility model, a retainer 7 is arranged in the rolling track, and the insulating rolling bodies 4 are arrayed on the retainer 7, the retainer 7 can disperse the rotating bodies, the insulating rolling bodies 4 are equally spaced, are uniformly distributed on the circumference of the rolling track to prevent adjacent two insulating rolling bodies 4 from colliding and rubbing with each other when the bearing outer ring 3 and the bearing inner ring 2 relatively rotate, guide the rotating bodies to rotate on the rolling track and work uniformly, limit and correct the position and posture of the insulating rolling body 4 in the rolling track, and prevent the insulating rolling body 4 from falling.

[0046] ​It needs to be explained that the shaft shoulder 18 and the plurality of locating nuts 17 are arranged on the outer circumferential side of the motor rotating shaft 1, and the shaft shoulder 18 and the plurality of locating nuts 17 top the two end faces of the bearing inner ring 2 respectively. Figure 3 And Figure 4 As shown in the drawings, the shaft shoulder 18 tops the right end face of the bearing inner ring 2, and the locating nut 17 tops the left end face of the bearing inner ring 2, so as to axially position the bearing inner ring 2 and prevent the bearing inner ring 2 from being separated from the motor rotating shaft 1 during operation, thereby effectively improving the stability of the bearing during operation.

[0047] During assembly, the bearing outer ring 3 is assembled on the motor end cover 16 through the first bolt connecting bolt hole, the bearing outer ring 3 is fixed and stationary relative to the motor end cover 16, the bearing inner ring 2 is sleeved and arranged on the circumferential outer side of the motor rotating shaft 1, the bearing inner ring 2 is in interference fit with the motor rotating shaft 1, the motor rotating shaft 1 drives the bearing inner ring 2 to rotate synchronously, and the lubricating grease in the grease storage chamber 6 provides lubricating grease to the rolling track in real time.

[0048] In summary, by integrating the bearing inner ring 2, the bearing outer ring 3, the insulating rolling body 4, the retainer 7, the grease cover plate 5 and the bearing flange 15, the bearing can be directly assembled on the motor end cover, compared with the existing open bearing of the motor, the bearing seat, the sealing gasket, the inner oil seal, the outer oil seal and other components are omitted, the overall structure of the bearing is simple and compact, the axial space of the motor is effectively saved, the space and weight of the motor are reduced, and the production cost of the motor is reduced.

[0049] It needs to be explained that in the present specification, the relationship terms such as first and second are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between the entities.

[0050] The principle and implementation mode of the present application are described by using specific examples in the present application, and the above description of the embodiments is only used to help understand the method and its core idea. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principle of the present application, the present application can be improved and modified in many ways, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. An integrated bearing unit for electric motors, characterized in that, include: Motor shaft; The bearing inner ring is sleeved on the circumferential outer side of the motor shaft, and the bearing inner ring is interference-fitted with the motor shaft; The bearing outer ring is located circumferentially outside the bearing inner ring. A rolling track is provided at the connection position between the bearing outer ring and the bearing inner ring. An insulated rolling element is provided in the rolling track. A bearing flange is integrally provided circumferentially outside the bearing outer ring. The bearing flange is connected to the motor end cover by a number of first bolts. A grease reservoir cover is provided, the inner side of which is connected to the inner ring of the bearing, the inner ring of the bearing being rotatable relative to the grease reservoir cover. The outer side of the grease reservoir cover is connected to the outer ring of the bearing. A grease reservoir is formed between the inner ring of the bearing, the outer ring of the bearing, and the grease reservoir cover. The grease reservoir is filled with lubricating grease and is connected to the rolling track.

2. The integrated bearing unit for a motor according to claim 1, characterized in that, The bearing outer ring has several flange holes arranged in an array on its end face, and the grease reservoir cover has several through holes arranged in an array on its outer side. A second bolt passes through the through holes and connects to the flange holes to connect the grease reservoir cover to the end face of the bearing outer ring.

3. The integrated bearing unit for a motor according to claim 1, characterized in that, The inner circumferential side of the outer ring of the bearing is provided with a first annular stepped groove, and the outer side of the grease reservoir cover is provided with an annular connecting part on the side facing the inner ring of the bearing. The outer circumferential side of the annular connecting part is interference-fitted with the inner circumferential side of the first annular stepped groove.

4. The integrated bearing unit for a motor according to claim 1, characterized in that, The outer ring of the bearing has an integrally formed annular protrusion on its end face, and the outer side of the grease reservoir cover plate has an annular connecting part on the side facing the inner ring of the bearing. The inner circumferential side of the annular connecting part is interference-fitted with the outer circumferential side of the annular protrusion.

5. An integrated bearing unit for a motor according to any one of claims 1-4, characterized in that, The inner ring of the bearing has several labyrinth grooves on both ends. The inner side of the grease reservoir cover is provided with a snap-fit ​​part facing the inner ring of the bearing, and the snap-fit ​​part is rotatably connected to the labyrinth grooves.

6. An integrated bearing unit for a motor according to any one of claims 1-4, characterized in that, The inner side of the grease reservoir cover is integrated with a sealing lip, and the outer circumferential side of the bearing inner ring is provided with a second annular stepped groove. The outer side of the sealing lip abuts against the second annular stepped groove to form a light contact lip seal, and the sealing lip is rotatably connected to the second annular stepped groove.

7. An integrated bearing unit for a motor according to any one of claims 1-4, characterized in that, The bearing outer ring has a first mounting groove on its inner circumferential side surface, and the bearing inner ring has a second mounting groove on its outer circumferential side surface. The first mounting groove and the second mounting groove are combined to form the rolling track.

8. The integrated bearing unit for a motor according to claim 7, characterized in that, The insulating rolling element is in any one of the following shapes: spherical, cylindrical, or conical.

9. The integrated bearing unit for a motor according to claim 8, characterized in that, A retainer is provided inside the rolling track, and the array of insulated rolling elements is arranged on the retainer.

10. An integrated bearing unit for a motor according to any one of claims 1-4, characterized in that, The outer circumferential side of the motor shaft is provided with a shoulder and several positioning nuts. The shoulder and several positioning nuts respectively support the two end faces of the bearing inner ring to axially position the bearing inner ring.

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