Motor bearing structure and motor
By setting up spacer components and elastic parts in the motor bearing structure, the problem of heat transfer between paired bearings is solved, the heat dissipation effect and support strength are improved, and the service life of the motor is extended.
Patent Information
- Application Number
- CN202420603643.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-03-26
AI Technical Summary
The heat is transferred between the paired motor bearings, resulting in poor heat dissipation effect and increased temperature, which affects the service life of the motor.
A motor bearing structure is designed to provide displacement to reduce axial load by providing a spacer assembly between the first bearing assembly and the second bearing assembly, separate the two bearings, reduce heat transfer, and provide elastic members and partitions between the bearings.
It effectively reduces the temperature rise of the bearing, improves the heat dissipation effect, extends the service life of the motor, and enhances the overall support strength of the rotor.
Smart Images
Figure CN222763698U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of motor technology, and in particular to a motor bearing structure and a motor. Background Art
[0002] At present, when paired bearings are used at both ends of a motor with a high rotational linear speed on the bearing surface, the temperature rise of the paired bearings is relatively high. The reasons are: on the one hand, since the paired bearings are close together, during the high-speed operation of the motor, the heat generated by the two close bearings will be transferred to each other, resulting in poor heat dissipation effect; on the other hand, when the motor is working, the temperature of the motor rotor is much higher than the temperature of the motor base, resulting in the axial thermal expansion of the shaft being greater than the axial thermal expansion of the base, and the outer ring area of the paired bearings is larger, and the contact friction between the bearing and the bearing seat is large. In this process, affected by the axial friction of the shaft, the axial load of the two bearings increases, thereby causing the temperature rise of the bearings. Utility Model Content
[0003] The main purpose of the present application is to provide a motor bearing structure and a motor to solve the problem that the heat generated between the bearings used in pairs in the motor will be transferred to each other, resulting in poor heat dissipation effect.
[0004] According to one aspect of the present application, a motor bearing structure is provided, comprising:
[0005] A rotating shaft, wherein a first bearing assembly and a second bearing assembly are sleeved at opposite ends of the rotating shaft along the axis direction of the rotating shaft, wherein the first bearing assembly and the second bearing assembly each include two bearings, and a first gap is formed between the two bearings;
[0006] A spacer sleeve assembly, wherein the spacer sleeve assembly is arranged in the first gap, and the spacer sleeve assembly includes a first spacer sleeve and a second spacer sleeve, wherein the first spacer sleeve is sleeved on the rotating shaft and abuts against the inner rings of the two bearings, and the second spacer sleeve is sleeved outside the first spacer sleeve and forms a second gap with the outer peripheral surface of the first spacer sleeve, and the second spacer sleeve abuts against the outer rings of the two bearings.
[0007] Furthermore, the second spacer is provided with a plurality of mounting grooves, the plurality of mounting grooves are arranged at intervals along the circumferential direction of the rotating shaft and are recessed along the axial direction of the rotating shaft;
[0008] The motor bearing structure also includes a plurality of elastic members, which are arranged in a one-to-one correspondence in the plurality of mounting grooves, and one end of the elastic member abuts against the inner wall surface of the mounting groove, and the other end of the elastic member abuts against the outer ring of one of the two bearings.
[0009] Furthermore, the elastic member includes a spring.
[0010] Furthermore, the motor bearing structure also includes a partition, which is arranged between the second spacer sleeve and the bearing, and there is a predetermined gap D1 between the partition and the second spacer sleeve along the axial direction of the rotating shaft, and one end of the elastic member abuts against the inner wall surface of the mounting groove, and the other end of the elastic member abuts against the partition.
[0011] Furthermore, the rotating shaft has an axial expansion amount L, and the predetermined gap D1 and the axial expansion amount L satisfy the relationship: 1.18*L<D1<1.22*L.
[0012] Furthermore, the elastic member and the partition plate are provided between the two bearings of at least one of the first bearing assembly and the second bearing assembly.
[0013] Furthermore, the motor bearing structure also includes:
[0014] A bearing seat, wherein the bearing seats include two, and the first bearing assembly and the second bearing assembly are respectively arranged on the two bearing seats;
[0015] An end cover assembly, the end cover assembly comprising a first end cover and a second end cover, the first end cover being arranged on a side of the first bearing assembly close to the second bearing assembly, and the second end cover being arranged on a side of the second bearing assembly close to the first bearing assembly;
[0016] A locking assembly, the locking assembly comprising a first locking member and a second locking member, the first locking member being arranged on a side of the first bearing assembly away from the first end cover and abutting against an inner ring of the bearing in the first bearing assembly, the second locking member being arranged on a side of the second bearing assembly away from the second end cover and abutting against an inner ring of the bearing in the second bearing assembly.
[0017] Further, a third gap is provided between the first end cover and the first bearing assembly, and a fourth gap is provided between the second end cover and the second bearing assembly.
[0018] Further, a fifth gap is provided between the first locking member and the first bearing assembly, and a sixth gap is provided between the second locking member and the second bearing assembly.
[0019] On the other hand, the present application also provides a motor, which includes the above-mentioned motor bearing structure.
[0020] Compared with the structure of the motor bearing in the prior art, the present application can separate two closely adjacent bearings by setting a spacer assembly between the two bearings of the first bearing assembly and between the two bearings of the second bearing assembly. At this time, the presence of the spacer assembly can reduce the heat transfer between the two bearings, thereby reducing the temperature rise of the bearings, thereby improving the heat dissipation effect of the bearings, and extending the service life of the motor to a certain extent. At the same time, the first bearing assembly and the second bearing assembly in the present application both adopt a paired bearing structure, which improves the support stiffness of the first bearing assembly and the second bearing assembly, thereby enhancing the overall support strength of the rotor. In addition, during the operation of the motor, the rotation of the shaft will drive the inner ring of the bearing to rotate. Therefore, the present application sets the second spacer on the outside of the first spacer and forms a second gap with the outer peripheral surface of the first spacer. The presence of the second gap can ensure the normal rotation of the inner ring of the bearing, thereby ensuring the normal operation of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0022] Figure 1 A cross-sectional view of a motor bearing structure disclosed in an embodiment of the present application;
[0023] Figure 2 The attached embodiment disclosed in this application Figure 1 A magnified schematic diagram of area A in the middle.
[0024] The above drawings include the following reference numerals:
[0025] 10. Rotating shaft; 20. First bearing assembly; 30. Second bearing assembly; 40. Spacer assembly; 41. First spacer; 42. Second spacer; 421. Mounting groove; 422. Second gap; 50. Elastic member; 60. Partition; 70. Bearing seat; 80. End cover assembly; 81. First end cover; 810. Third gap; 82. Second end cover; 820. Fourth gap; 90. Locking assembly; 91. First locking member; 910. Fifth gap; 92. Second locking member; 920. Sixth gap. DETAILED DESCRIPTION
[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.
[0029] As mentioned in the background technology, when the existing motor uses bearings used in pairs, since the bearings used in pairs are close together, during the high-speed operation of the motor, the heat generated by the two close bearings will be transferred to each other, resulting in a higher temperature rise of the bearings used in pairs, thereby resulting in poor heat dissipation effect of the bearings. Therefore, in order to improve the heat dissipation effect between the bearings used in pairs, the inventor of the present application has designed a new motor bearing structure, which will be described in detail below.
[0030] See also Figure 1 to Figure 2 As shown, the present application provides a motor bearing structure, which includes a rotating shaft 10, a first bearing assembly 20, a second bearing assembly 30 and a spacer assembly 40.
[0031] Among them, along the axial direction of the rotating shaft 10, the first bearing assembly 20 and the second bearing assembly 30 are sleeved at the opposite ends of the rotating shaft 10, and the first bearing assembly 20 and the second bearing assembly 30 each include two bearings, and there is a first gap between the two bearings (the first gap is not shown in the accompanying drawings); the spacer assembly 40 is arranged in the first gap, and the spacer assembly 40 includes a first spacer 41 and a second spacer 42. The first spacer 41 is sleeved on the rotating shaft 10 and abuts against the inner rings of the two bearings, and the second spacer 42 is sleeved on the outside of the first spacer 41 and forms a second gap 422 with the outer peripheral surface of the first spacer 41, and the second spacer 42 abuts against the outer rings of the two bearings.
[0032] In this embodiment, the first bearing assembly 20 and the second bearing assembly 30 each include two bearings, and the spacer assembly 40 includes a first spacer 41 and a second spacer 42. When the motor bearing structure is actually processed, the first bearing assembly 20 and the second bearing assembly 30 can be sleeved on opposite ends of the rotating shaft 10, and the two bearings in the first bearing assembly 20 are spaced so that there is a first gap between the two bearings. At the same time, the two bearings in the second bearing assembly 30 are spaced so that there is also a first gap between the two bearings, and then the spacer assembly 40 is arranged in both first gaps. At this time, the first spacer 41 is sleeved on the rotating shaft 10 and abuts against the inner rings of the two bearings, and the second spacer 42 is sleeved outside the first spacer 41 and abuts against the outer rings of the two bearings, and there is a second gap 422 between the first spacer 41 and the second spacer 42. In this way, when the motor runs at high speed, the spacer assembly 40 can separate the two bearings in the first bearing assembly 20 and the second bearing assembly 30, reduce heat accumulation, and effectively avoid the mutual transfer of heat between the two bearings, thereby reducing the temperature rise of the bearings, and then the heat dissipation effect of the bearings, thereby improving and extending the service life of the motor to a certain extent.
[0033] That is to say, compared with the structure of the motor bearing in the prior art, the present embodiment can separate the two closely adjacent bearings by setting the spacer assembly 40 between the two bearings of the first bearing assembly 20 and between the two bearings of the second bearing assembly 30. At this time, the presence of the spacer assembly 40 can reduce the heat transfer between the two bearings, thereby reducing the temperature rise of the bearings, thereby improving the heat dissipation effect of the bearings, and extending the service life of the motor to a certain extent. At the same time, the first bearing assembly 20 and the second bearing assembly 30 in the present embodiment both adopt a paired bearing structure, which improves the support stiffness of the first bearing assembly 20 and the second bearing assembly 30, thereby enhancing the overall support strength of the rotor. In addition, during the operation of the motor, since the rotation of the shaft 10 will drive the inner ring of the bearing to rotate, the present embodiment sets the second spacer 42 on the outside of the first spacer 41 and forms a second gap 422 with the outer peripheral surface of the first spacer 41. The presence of the second gap 422 can ensure the normal rotation of the inner ring of the bearing, thereby ensuring the normal operation of the motor.
[0034] Further, see Figure 2As shown, in this embodiment, a plurality of mounting grooves 421 are arranged on the second spacer 42, and the plurality of mounting grooves 421 are arranged at intervals along the circumferential direction of the rotating shaft 10 and are recessed along the axial direction of the rotating shaft 10; the motor bearing structure also includes a plurality of elastic members 50, and one end of the elastic member 50 abuts against the inner wall surface of the mounting groove 421, and the other end of the elastic member 50 abuts against the outer ring of one of the two bearings. Specifically, the first spacer 41 and the second spacer 42 in this embodiment are both annular structures, and along the axial direction of the rotating shaft 10, the width of the first spacer 41 is greater than the width of the second spacer 42, that is, there is a gap between the second spacer 42 and the bearing, and a part of the elastic member 50 is located in the gap. In this way, when the outer ring of the bearing applies a force to the elastic member 50, the elastic member 50 can shrink toward the mounting groove 421, and when the outer ring of the bearing does not apply a force to the elastic member 50, the elastic member 50 can extend from the mounting groove 421.
[0035] Specifically, when the motor is working, since the temperature of the rotor is much higher than the temperature of the motor base, during this process, the rotating shaft 10 is elongated due to thermal expansion, thereby increasing the axial load of the bearing. Therefore, in this embodiment, multiple elastic members 50 are arranged in a one-to-one correspondence in multiple installation grooves 421, and the opposite ends of the elastic member 50 are respectively abutted against the inner wall surface of the installation groove 421 and the outer ring of the bearing. At this time, since there is a gap between the second spacer 42 and the bearing, the elastic member 50 performs telescopic movement under the action of the outer ring of the bearing, thereby providing a relative displacement for the outer rings of the two bearings, thereby reducing the axial load of the bearing, and further reducing the temperature rise between the two bearings to a certain extent. The multiple installation grooves 421 are arranged on the second spacer 42, which is conducive to the stable assembly of the elastic member 50, effectively ensuring the stable operation of the motor, and at the same time, the displacement provided by the elastic member 50 can solve the problem of large axial load of the bearing.
[0036] Specifically, the installation groove 421 in the present application may include one, two, three, four or more than four, and the elastic member 50 may include one, two, three, four or more than four. The present application does not specifically limit the number of the installation groove 421 and the elastic member 50, and can be designed according to actual processing requirements.
[0037] Specifically, the elastic member 50 in this embodiment includes a spring. Of course, in other embodiments of the present application, the elastic member 50 can also be set as an elastic gasket, an elastic sleeve and other structures. As long as it is other deformation methods under the conception of the present application, it is within the protection scope of the present application.
[0038] Specifically, the first spacer 41 and the second spacer 42 in this embodiment are made of steel material, preferably 45 grade steel.
[0039] Further, see Figure 2As shown, the motor bearing structure in this embodiment also includes a partition 60, which is arranged between the second spacer sleeve 42 and the bearing. Along the axial direction of the rotating shaft 10, there is a predetermined gap D1 between the partition 60 and the second spacer sleeve 42, and one end of the elastic member 50 abuts against the inner wall surface of the mounting groove 421, and the other end of the elastic member 50 abuts against the partition 60. In this embodiment, the partition 60 is arranged between the second spacer sleeve 42 and the bearing, which reduces the gap between the second spacer sleeve 42 and the bearing, effectively preventing the outer ring of the bearing from having a large deflection when the motor is working, and ensuring the stable operation of the motor. At the same time, there is a predetermined gap D1 between the partition 60 and the second spacer sleeve 42 in this embodiment, which can provide a relative displacement for the outer rings of the two bearings, thereby reducing the bearing load of the bearing, and further reducing the temperature rise between the two bearings. And because the elastic member 50 abuts against the partition 60, during the operation of the motor, the pressure on the elastic member 50 can be transmitted to the partition 60, and then evenly transmitted to the bearing.
[0040] Furthermore, the shaft 10 in this embodiment has an axial expansion amount L, and the relationship between the predetermined gap D1 and the axial expansion amount L satisfies the formula: 1.18*L<D1<1.22*L. In order to control the displacement of the two bearing outer rings, this embodiment is achieved by controlling the width of the predetermined gap D1 along the axial direction of the shaft 10. It can be understood that this embodiment does not specifically limit the axial expansion amount L of the shaft 10, and the predetermined gap D1 between the partition 60 and the second spacer 42 can be adjusted according to the expansion amount detected during actual operation.
[0041] Specifically, the predetermined gap D1 of this embodiment and the axial expansion amount L satisfy the relationship: D1 = 1.2*L.
[0042] Further, in this embodiment, an elastic member 50 and a partition plate 60 are disposed between two bearings of at least one of the first bearing assembly 20 and the second bearing assembly 30. That is, the elastic member 50 and the partition plate 60 can be disposed between the two bearings of the first bearing assembly 20 and between the two bearings of the second bearing assembly 30, and can also be disposed between the two bearings of the first bearing assembly 20 or between the two bearings of the second bearing assembly 30. Figure 2 The figure shows the situation when the elastic member 50 and the partition 60 are arranged between the second bearing assembly 30. This is because the two bearings of the first bearing assembly 20 in this embodiment are fixed end bearings for axial positioning and fixing, and the two bearings of the second bearing assembly 30 are floating end bearings for bearing radial loads. At this time, the elongation of the rotating shaft 10 due to thermal expansion occurs at the floating end bearing, not the fixed end bearing. Therefore, in this embodiment, the elastic member 50 and the partition 60 are arranged at the floating end bearing, which can reduce the axial load of the bearing, thereby reducing the temperature rise between the two bearings, and effectively ensuring the normal operation of the motor.
[0043] Further, see Figure 1 As shown, the motor bearing structure in this embodiment further includes a bearing seat 70 , an end cover assembly 80 and a locking assembly 90 .
[0044] Among them, the bearing seats 70 include two, and the first bearing assembly 20 and the second bearing assembly 30 are respectively arranged on the two bearing seats 70; the end cover assembly 80 includes a first end cover 81 and a second end cover 82, the first end cover 81 is arranged on the side of the first bearing assembly 20 close to the second bearing assembly 30, and the second end cover 82 is arranged on the side of the second bearing assembly 30 close to the first bearing assembly 20; the locking assembly 90 includes a first locking member 91 and a second locking member 92, the first locking member 91 is arranged on the side of the first bearing assembly 20 away from the first end cover 81, and abuts against the inner ring of the bearing in the first bearing assembly 20, and the second locking member 92 is arranged on the side of the second bearing assembly 30 away from the second end cover 82, and abuts against the inner ring of the bearing in the second bearing assembly 30. Among them, the bearing seat 70 can support the first bearing assembly 20 and the second bearing assembly 30, so that the first bearing assembly 20 and the second bearing assembly 30 can bear axial loads and radial loads, and at the same time, it can also support the rotating shaft 10; the first end cover 81 and the first locking member 91, as well as the second end cover 82 and the second locking member 92 can fix the first bearing assembly 20 and the second bearing assembly 30 respectively.
[0045] Specifically, the first locking member 91 and the second locking member 92 in this embodiment are both locking nuts.
[0046] Specifically, the bearing seat 70 in this embodiment is connected to the outer rings of the two bearings of the first bearing assembly 20 and the outer rings of the two bearings of the second bearing assembly 30 by means of transition fit.
[0047] Further, see Figure 1 As shown, in this embodiment, there is a third gap 810 between the first end cover 81 and the first bearing assembly 20, and there is a fourth gap 820 between the second end cover 82 and the second bearing assembly 30. Since the first bearing assembly 20 and the second bearing assembly 30 generate heat during the operation of the motor, the existence of the third gap 810 and the fourth gap 820 can provide heat dissipation space for the first bearing assembly 20 and the second bearing assembly 30 in this process, and on the basis of providing the spacer assembly 40, the heat dissipation capacity of the first bearing assembly 20 and the second bearing assembly 30 is further improved.
[0048] Further, see Figure 1As shown, in this embodiment, there is a fifth gap 910 between the first locking member 91 and the first bearing assembly 20, and there is a sixth gap 920 between the second locking member 92 and the second bearing assembly 30. Since the first bearing assembly 20 and the second bearing assembly 30 generate heat during the operation of the motor, the existence of the fifth gap 910 and the sixth gap 920 can provide heat dissipation space for the first bearing assembly 20 and the second bearing assembly 30 in this process. On the basis of providing the spacer assembly 40, the third gap 810 and the fourth gap 820, the heat dissipation capacity of the first bearing assembly 20 and the second bearing assembly 30 is further improved.
[0049] In summary, the motor bearing structure of the present application has the following advantages:
[0050] (1) The spacer assembly can separate the two bearings, reduce the accumulation of heat generated by the bearings, and effectively avoid the transfer of heat between the bearings, thereby improving the heat dissipation capacity of the bearings;
[0051] (2) The arrangement of the elastic member and the partition plate can provide the two bearings with a displacement along the axial direction of the rotating shaft, thereby reducing the axial load of the bearings and further reducing the temperature rise between the two bearings to a certain extent;
[0052] (3) The use of a paired bearing structure improves the supporting strength of the first bearing assembly and the second bearing assembly;
[0053] (4) By providing a bearing seat and installing the first bearing assembly and the second bearing assembly in the bearing seat, the bearing seat can support the bearing and ensure stable operation of the motor.
[0054] On the other hand, the embodiment of the present application further provides a motor, which includes the above motor bearing structure, and thus the motor includes all the technical effects of the above motor bearing structure. Since the technical effects of the motor bearing structure have been described in detail above, they will not be repeated here.
[0055] 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.
[0056] 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. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.
[0057] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A motor bearing structure, characterized in that: include: A rotating shaft (10), wherein a first bearing assembly (20) and a second bearing assembly (30) are sleeved on opposite ends of the rotating shaft (10) along the axial direction of the rotating shaft (10), wherein the first bearing assembly (20) and the second bearing assembly (30) each include two bearings, and a first gap is formed between the two bearings; A spacer sleeve assembly (40), wherein the spacer sleeve assembly (40) is arranged in the first gap, and the spacer sleeve assembly (40) includes a first spacer sleeve (41) and a second spacer sleeve (42), wherein the first spacer sleeve (41) is sleeved on the rotating shaft (10) and abuts against the inner rings of the two bearings, and the second spacer sleeve (42) is sleeved outside the first spacer sleeve (41) and forms a second gap (422) with the outer peripheral surface of the first spacer sleeve (41), and the second spacer sleeve (42) abuts against the outer rings of the two bearings.
2. The motor bearing structure according to claim 1, characterized in that: The second spacer (42) is provided with a plurality of mounting grooves (421), the plurality of mounting grooves (421) are arranged at intervals along the circumferential direction of the rotating shaft (10) and are recessed along the axial direction of the rotating shaft (10); The motor bearing structure further comprises a plurality of elastic members (50), wherein the plurality of elastic members (50) are arranged in a one-to-one correspondence in the plurality of mounting grooves (421), and one end of the elastic member (50) abuts against an inner wall surface of the mounting groove (421), and the other end of the elastic member (50) abuts against an outer ring of one of the two bearings.
3. The motor bearing structure according to claim 2, characterized in that: The elastic member (50) comprises a spring.
4. The motor bearing structure according to claim 2, characterized in that: The motor bearing structure also includes a partition plate (60), which is arranged between the second spacer sleeve (42) and the bearing. Along the axial direction of the rotating shaft (10), there is a predetermined gap D1 between the partition plate (60) and the second spacer sleeve (42), and one end of the elastic member (50) abuts against the inner wall surface of the mounting groove (421), and the other end of the elastic member (50) abuts against the partition plate (60).
5. The motor bearing structure according to claim 4, characterized in that: The rotating shaft (10) has an axial expansion amount L, and the predetermined gap D1 and the axial expansion amount L satisfy the relationship: 1.18*L<D1<1.22*L.
6. The motor bearing structure according to claim 4, characterized in that: The elastic member (50) and the partition plate (60) are arranged between the two bearings of at least one of the first bearing assembly (20) and the second bearing assembly (30).
7. The motor bearing structure according to claim 1, characterized in that: The motor bearing structure also includes: A bearing seat (70), wherein the bearing seat (70) comprises two, and the first bearing assembly (20) and the second bearing assembly (30) are respectively arranged on the two bearing seats (70); an end cover assembly (80), the end cover assembly (80) comprising a first end cover (81) and a second end cover (82), the first end cover (81) being arranged on a side of the first bearing assembly (20) close to the second bearing assembly (30), and the second end cover (82) being arranged on a side of the second bearing assembly (30) close to the first bearing assembly (20); A locking assembly (90), wherein the locking assembly (90) comprises a first locking member (91) and a second locking member (92), wherein the first locking member (91) is arranged on a side of the first bearing assembly (20) away from the first end cover (81), and abuts against an inner ring of the bearing in the first bearing assembly (20), and the second locking member (92) is arranged on a side of the second bearing assembly (30) away from the second end cover (82), and abuts against an inner ring of the bearing in the second bearing assembly (30).
8. The motor bearing structure according to claim 7, characterized in that: A third gap (810) is provided between the first end cover (81) and the first bearing assembly (20), and a fourth gap (820) is provided between the second end cover (82) and the second bearing assembly (30).
9. The motor bearing structure according to claim 7, characterized in that: A fifth gap (910) is provided between the first locking member (91) and the first bearing assembly (20), and a sixth gap (920) is provided between the second locking member (92) and the second bearing assembly (30).
10. A motor, characterized in that: The motor comprises the motor bearing structure according to any one of claims 1 to 9.