Insulating sleeve, bearing assembly and motor cover assembly

Abstract

The utility model discloses an insulating sleeve, bearing assembly and motor cover assembly relates to bearing technical field, wherein, the insulating sleeve is used for bearing, the insulating sleeve includes first main part, the inside of first main part is used for bearing installation, the outside of first main part is used for with installation medium connection, the material quality of insulating sleeve is configured as ceramic. The utility model provides technical scheme has improved the heat dissipation performance of bearing assembly and the service life of bearing grease, has reduced bearing wear, has improved the insulation reliability of bearing.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, and in particular to an insulating sleeve, a bearing assembly, and a motor end cover assembly. Background Technology

[0002] In specialized applications such as motors, rail transportation, and high-voltage equipment, bearings require external insulation to prevent electrolytic corrosion damage caused by current flowing through them. Currently, the industry primarily employs an insulating coating sprayed onto the outer ring of the bearing. However, this coating is prone to peeling off due to mechanical wear or thermal stress, resulting in low long-term reliability. Utility Model Content

[0003] The main objective of this invention is to provide an insulating sleeve, a bearing assembly, and a motor cover assembly, which aim to improve the insulation reliability of the bearing.

[0004] To achieve the above objectives, the present invention proposes an insulating sleeve for bearings. The insulating sleeve includes a first main body, the inner side of which is used for bearing installation, and the outer side of which is used for connection with an installation medium. The insulating sleeve is made of ceramic.

[0005] In one embodiment, the ceramic is silicon nitride.

[0006] In one embodiment, the thickness of the insulating sleeve is 2mm-3mm; and / or

[0007] The insulating sleeve has a thermal conductivity of 20-40 W / mK and a coefficient of thermal expansion of 2.5-3.5 (*10). -6 / K).

[0008] In one embodiment, the first main body is provided with a first anti-rotation structure, which is used to cooperate with the installation medium.

[0009] In one embodiment, the first anti-rotation structure is configured as an anti-rotation lug located on the outer side of the first main body and extending outward, the anti-rotation lug being used to connect with the mounting medium.

[0010] In one embodiment, one axial end of the first main body extends inward to form a first limiting platform, which is used to limit the axial movement of the bearing.

[0011] This utility model also proposes a bearing assembly, comprising:

[0012] The aforementioned insulating sleeve; and

[0013] The bearing has an insulating sleeve disposed on the outside of the outer ring of the bearing.

[0014] In one embodiment, the bearing assembly further includes a limiting ring disposed within the insulating sleeve. The limiting ring includes a second main body portion and a second limiting platform extending inward at one end along the axial direction of the second main body portion. The second main body portion is disposed inside the first main body portion, and the second limiting platform is disposed at one end near the axial direction of the insulating sleeve and is used to limit the axial movement of the bearing.

[0015] In one embodiment, the bearing assembly further includes a buffer pad, the two ends of which abut against the second limiting platform and the outer ring of the bearing, respectively.

[0016] This utility model also proposes a motor cover assembly, comprising:

[0017] The cover body is provided with mounting holes;

[0018] A steel sleeve is installed in the mounting hole; and

[0019] The bearing assembly is mounted on the steel sleeve.

[0020] In one embodiment, the steel sleeve is provided with a second anti-rotation structure, which cooperates with the insulating sleeve to restrict the rotation of the insulating sleeve.

[0021] In one embodiment, one axial end of the cover body extends inward to form a mounting platform, which is used to abut against one end of the insulating sleeve.

[0022] The technical solution of this utility model includes an insulating sleeve comprising a first main body portion. The inner side of the first main body portion is used for bearing installation, and the outer side of the first main body portion is used for connection with the installation medium. The insulating sleeve is made of ceramic. Thus, on the one hand, compared to the prior art where an insulating coating is sprayed onto the outer ring of the bearing, the insulating sleeve in this utility model is directly fitted over the bearing, thereby avoiding peeling of the coating due to mechanical wear or thermal stress, and thus improving the reliability of bearing insulation. On the other hand, compared to the use of polymer materials, the insulating sleeve in this utility model is made of ceramic, which ensures that the insulating sleeve achieves insulation while also guaranteeing the heat dissipation effect of the bearing, improving the heat dissipation performance of the bearing assembly, extending the service life of the bearing grease, reducing bearing wear, and improving the reliability of bearing insulation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 An exploded structural diagram of an embodiment of the motor cover assembly provided by this utility model.

[0025] Explanation of icon numbers:

[0026] 100. Insulating sleeve; 110. First main body; 111. First anti-rotation structure; 112. Anti-rotation lug; 120. First limiting platform;

[0027] 200. Bearing assembly; 210. Limiting ring; 211. Second main body; 212. Second limiting platform;

[0028] 300. Motor cover assembly; 310. Cover body; 311. Mounting hole; 312. Mounting platform; 320. Steel sleeve; 321. Second anti-rotation structure; 322. Anti-rotation groove.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] In specialized applications such as motors, rail transportation, and high-voltage equipment, bearings require external insulation to prevent electrolytic corrosion damage caused by current flowing through them. Currently, besides ceramic ball bearings, the industry primarily uses insulation solutions such as spraying insulating coatings, insulating sheaths, or insulating sleeves made of polymer materials like PEEK onto the outer ring of the bearing. However, these coatings or sheaths are prone to peeling off due to mechanical wear or thermal stress, resulting in low long-term reliability. Poor heat dissipation from polymer insulating sleeves can also affect the lifespan of bearings, especially lubricating grease, as well as bearing wear and reliability.

[0034] This utility model proposes an insulating sleeve 100 for being fitted over the bearing.

[0035] Please see Figure 1 In one embodiment of the present invention, the insulating sleeve 100 is used for a bearing. The insulating sleeve 100 includes a first main body 110. The inner side of the first main body 110 is used for bearing installation, and the outer side of the first main body 110 is used for connection with the installation medium. The insulating sleeve 100 is made of ceramic.

[0036] Understandably, bearings can be used in many applications, such as motors and high-voltage equipment. Taking a motor as an example, a motor includes a motor housing and a rotor. The rotor is housed within the motor housing, with a portion of the rotor shaft extending out to transmit power to other structural components. Specifically, the end cover of the motor housing has mounting holes 311 for installing the rotor shaft. A bearing is fitted onto the rotor shaft and installed in the mounting holes 311. In this way, the bearing supports and positions the rotor while reducing frictional resistance during rotor rotation.

[0037] To prevent axial corrosion, bearings require insulation. Therefore, this invention proposes an insulating sleeve 100 that can be fitted over the bearing. Specifically, the insulating sleeve 100 includes a first main body 110. Along the radial direction of the first main body 110, the direction closer to the center of the first main body 110 is the inner side, and the direction farther from the center of the first main body 110 is the outer side. The inner side of the first main body 110 is used for bearing installation, and the outer side of the first main body 110 is used for connection with the installation medium. Thus, compared to providing an insulating coating on the outer ring of the bearing, this invention provides an insulating sleeve 100 that can be fitted over the bearing, thereby improving the reliability of bearing insulation. The installation medium varies depending on the bearing's application scenario. The installation medium can be an end cover of a motor, an end cover of a fan, the base of a food processing machine, etc. No limitation is made on the installation medium here; the following explanation uses an electrode end cover as an example.

[0038] In one embodiment, the insulating sleeve 100 is made of ceramic, meaning the entire insulating sleeve 100 is made of ceramic. Ceramic has excellent insulation properties and also excellent thermal conductivity. Thus, the ceramic insulating sleeve 100 not only provides insulation but also ensures effective heat dissipation of the bearing, thereby improving the heat dissipation performance of the bearing assembly 200 and extending the bearing's service life.

[0039] The technical solution of this utility model includes an insulating sleeve 100 comprising a first main body 110. The inner side of the first main body 110 is used for bearing installation, and the outer side of the first main body 110 is used for connection with the installation medium. The insulating sleeve 100 is made of ceramic. Thus, on the one hand, compared to the prior art where an insulating coating is sprayed onto the outer ring of the bearing, the insulating sleeve 100 of this utility model is directly fitted onto the outside of the bearing, thereby avoiding peeling of the coating due to mechanical wear or thermal stress, and thus improving the reliability of bearing insulation. On the other hand, compared to the use of polymer materials, the insulating sleeve 100 of this utility model is made of ceramic, which allows the insulating sleeve 100 to achieve insulation while also ensuring the heat dissipation effect of the bearing, improving the heat dissipation performance of the bearing assembly 200, extending the service life of the bearing grease, reducing bearing wear, and improving the reliability of bearing insulation.

[0040] In this embodiment of the invention, the ceramic is configured as silicon nitride. It is understood that silicon nitride has good thermal conductivity, which is beneficial for heat dissipation in the bearing, and also has good thermal stability, preventing deformation under high-temperature conditions. Of course, in other embodiments, the insulating sleeve 100 can also be made of ceramic materials such as alumina.

[0041] In this embodiment of the invention, the thickness of the insulating sleeve 100 is 2mm-3mm. It can be understood that the thickness of the insulating sleeve 100 refers to the distance between the inner and outer walls of the insulating sleeve 100 along the radial direction of the first main body 110, which is 2mm-3mm. This helps to ensure the structural strength of the insulating sleeve 100 and its service life.

[0042] In one embodiment, the insulating sleeve 100 has a thermal conductivity of 20-40 W / mK and a coefficient of thermal expansion of 2.5-3.5 (*10) -6 / K). Understandably, a higher thermal conductivity indicates better heat dissipation. A lower coefficient of thermal expansion indicates better thermal stability. In this invention, the insulating sleeve 100 is made of ceramic material with a thermal conductivity of 20-40 W / mK and a coefficient of thermal expansion of 2.5-3.5 (*10). -6 / K), thus ensuring both heat dissipation performance and thermal stability of the ceramic insulating sleeve 100. In one embodiment, the thermal conductivity of silicon nitride is 20 W / mK, and the coefficient of thermal expansion is 3 (*10) -6 / K).

[0043] In an embodiment of this utility model, a first anti-rotation structure 111 is provided on the first main body 110, and the first anti-rotation structure 111 is used to cooperate with the installation medium.

[0044] Understandably, when using the insulating sleeve 100, it needs to be installed on the motor end cover, and the bearing needs to be installed inside the insulating sleeve 100. To prevent the insulating sleeve 100 from rotating during rotor shaft rotation, a first anti-rotation structure 111 is provided on the first main body 110 of the insulator. Correspondingly, a second anti-rotation structure 321 is provided on the mounting medium, i.e., the motor end cover. The first anti-rotation structure 111 and the second anti-rotation structure 321 cooperate to fix the insulating sleeve 100 on the motor end cover, thereby preventing the insulating sleeve 100 from rotating.

[0045] In an embodiment of this utility model, the first anti-rotation structure 111 is configured as an anti-rotation lug 112 located on the outside of the first main body 110 and extending outward, the anti-rotation lug 112 being used to connect with the mounting medium.

[0046] Specifically, in the embodiment shown in the figures of this utility model, the first anti-rotation structure 111 is configured as an anti-rotation lug 112 located on the outer side of the first main body 110 and extending outward. The anti-rotation lug 112 cooperates with the second anti-rotation structure 321 on the motor end cover, thereby restricting the rotation of the insulating sleeve 100. It is understood that "outer side" refers to the direction radially away from the center of the first main body 110. In one embodiment, the cross-section of the anti-rotation lug 112 is rectangular. Of course, in other embodiments, the cross-section of the anti-rotation lug 112 can also be trapezoidal, elliptical, etc., and is not limited here. In one embodiment, multiple anti-rotation lugs 112 are provided, and the multiple anti-rotation lugs 112 are evenly spaced along the circumference of the first main body 110. The number of anti-rotation lugs 112 is not limited here.

[0047] In an embodiment of the present invention, one axial end of the first main body 110 extends inward to form a first limiting platform 120, which is used to limit the axial movement of the bearing.

[0048] Specifically, the insulating sleeve 100 also includes a first limiting platform 120, with one axial end of the first main body 110 extending inward to form the first limiting platform 120. Understandably, "inner side" refers to the direction along the radial direction of the first main body 110, close to its center. During operation, the rotor shaft may experience axial movement due to external forces or installation tolerances, causing axial movement of the bearings on the rotor shaft. The first limiting platform 120 is used to limit the axial displacement of the bearings, preventing further axial displacement and thus restricting the axial movement of the rotor shaft.

[0049] This utility model also proposes a bearing assembly 200, which includes a bearing (not shown) and an insulating sleeve 100. The specific structure of the insulating sleeve 100 is as described in the above embodiments. Since this bearing assembly 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The bearing includes an outer ring, an inner ring, rolling elements, and a cage. The insulating sleeve 100 is sleeved on the outside of the outer ring of the bearing. Thus, the bearing and the insulating sleeve 100 are divided into two relatively independent structural components. Compared with the scheme of setting the bearing as an insulated bearing, that is, setting the rolling elements in the bearing as ceramic, this utility model provides a ceramic insulating sleeve 100 on the outer ring of the bearing, thereby significantly reducing the cost of the bearing assembly 200 and simplifying the bearing assembly process. At the same time, compared with the scheme of coating the bearing with an insulating coating, which has the problem of easy peeling off, the insulating sleeve 100 provided by this utility model ensures the reliability of the insulation effect.

[0050] In an embodiment of the present invention, the bearing assembly 200 further includes a limiting ring 210 disposed within the insulating sleeve 100. The limiting ring 210 includes a second main body 211 and a second limiting platform 212 extending inward at one end along the axial direction of the second main body 211. The second main body 211 is disposed inside the first main body 110, and the second limiting platform 212 is disposed near one end of the insulating sleeve 100 along the axial direction and is used to limit the axial movement of the bearing.

[0051] Specifically, the bearing assembly 200 further includes a retaining ring 210 disposed within the insulating sleeve 100. The retaining ring 210 includes a second main body portion 211 and a second retaining platform 212. The second main body portion 211 extends axially and is disposed on the inner sidewall of the first main body portion 110. The second retaining platform 212 is located at one axial end of the second main body portion 211 and extends radially toward the center of the second main body portion 211. It is understood that, axially, the axial length of the retaining ring 210 is less than the axial length of the first main body portion 110. The retaining ring 210 is installed within the insulating sleeve 100 and near one axial end of the insulating sleeve 100. In the axial direction, the retaining ring 210 is located at the end of the insulating sleeve 100 furthest from the bearing. Thus, the second retaining platform 212 of the retaining ring 210 is installed inside the first retaining platform 120 of the insulating sleeve 100. In one embodiment, the radial widths of the second limiting platform 212 and the first limiting platform 120 are the same to facilitate the installation of the limiting ring 210 and the insulating sleeve 100. Along the axial direction, the second limiting platform 212 is located at one end of the bearing to limit the axial displacement of the bearing, preventing further axial displacement and thus limiting the axial movement of the rotor shaft.

[0052] In an embodiment of this utility model, the bearing assembly 200 further includes a buffer pad (not shown), the two ends of which abut against the second limiting platform 212 and the outer ring of the bearing, respectively.

[0053] Understandably, when the rotor shaft experiences axial movement, the bearings on the rotor shaft also experience axial movement. To prevent the bearings from directly colliding with the limiting ring 210 during this movement, thus avoiding damage to the bearings, a buffer pad is provided between the outer ring of the bearing and the second limiting platform 212 of the limiting ring 210. In this way, the buffer pad not only prevents axial movement of the bearings but also avoids damage. In one embodiment, the buffer pad is configured as a multi-layered wave pad. Of course, in other embodiments, the buffer pad can also be other types of spring pads, etc.

[0054] Understandably, when installing the bearing assembly 200, the outer ring of the bearing is located on the side of the first main body 110 of the insulating sleeve 100 away from the first limiting platform 120. Understandably, the rotor shaft cannot have excessive axial movement during motor operation; however, in one embodiment, to ensure normal motor operation, the rotor shaft needs to have a certain preset axial movement. Here, the specific value of the preset axial movement of the rotor shaft is not limited. In one embodiment, the bearing and the insulating sleeve 100 are clearance-fitted to satisfy the preset axial movement of the rotor shaft. The size of the clearance between the bearing and the insulating sleeve 100 is adapted to the size of the preset axial movement of the rotor shaft and is not limited here.

[0055] This utility model also proposes a motor cover assembly 300, which includes a cover body 310, a steel sleeve 320, and a bearing assembly 200. The specific structure of the bearing assembly 200 is as described in the above embodiments. Since this motor cover assembly 300 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The cover body 310 is provided with a mounting hole 311, the steel sleeve 320 is installed in the mounting hole 311, and the bearing assembly 200 is installed in the steel sleeve 320. Specifically, the cover body 310 is generally made of aluminum to facilitate the lightweighting and heat dissipation of the motor. The bearing is generally made of steel. Steel and aluminum have different coefficients of thermal expansion, that is, different thermal stability performance. To avoid the influence of the aluminum cover body 310 on the thermal stability performance of the bearing, a steel sleeve 320 is provided between the cover body 310 and the bearing. The steel sleeve 320 is made of the same material as the bearing and has the same thermal stability performance, thereby ensuring the service life of the bearing. In one embodiment, the steel sleeve 320 and the cover body 310 are formed by injection molding.

[0056] In an embodiment of this utility model, a second anti-rotation structure 321 is provided on the steel sleeve 320. The second anti-rotation structure 321 cooperates with the insulating sleeve 100 to restrict the rotation of the insulating sleeve 100.

[0057] In the solution shown in the figure of this utility model, the steel sleeve 320 is provided with a second anti-rotation structure 321. It can be understood that the steel sleeve 320 is fixed on the cover body 310, and the second anti-rotation structure 321 cooperates with the first anti-rotation structure 111 on the insulating sleeve 100 to restrict the rotation of the insulating sleeve 100.

[0058] Specifically, the second anti-rotation structure 321 is configured as an anti-rotation groove 322 located at one end of the steel sleeve 320 along the axial direction. The anti-rotation groove 322 has a certain groove depth along the axial direction and a certain groove width along the circumferential direction. Correspondingly, the first anti-rotation structure 111 is configured as an anti-rotation lug 112 located on the first main body 110. The anti-rotation lug 112 extends into the anti-rotation groove 322, thereby achieving anti-rotation of the insulating sleeve 100. In one embodiment, the number, position, shape, etc. of the anti-rotation groove 322 are adapted to the anti-rotation lug 112, and are not limited here. Of course, in other embodiments, the first anti-rotation structure 111 may be configured as a groove and the second anti-rotation structure 321 may be configured as a lug, and are not limited here.

[0059] In an embodiment of this utility model, one axial end of the cover body 310 extends inward to form a mounting platform 312, which is used to abut against one end of the insulating sleeve 100.

[0060] Understandably, one axial end of the cover body 310 has a mounting platform 312, which is used to abut against the first limiting platform 120 of the insulating sleeve 100, thereby providing installation and support for the first limiting platform 120 and ensuring the installation stability of the insulating sleeve 100. In one embodiment, the radial width of the mounting platform 312 is greater than or equal to the radial width of the first limiting platform 120 in the radial direction.

[0061] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. An insulating sleeve for a bearing, characterized in that, The insulating sleeve includes a first main body portion, the inner side of which is used for bearing installation, and the outer side of which is used for connection with the installation medium. The insulating sleeve is made of ceramic.

2. The insulating sleeve as described in claim 1, characterized in that, The ceramic is silicon nitride.

3. The insulating sleeve as described in claim 1, characterized in that, The thickness of the insulating sleeve is 2mm-3mm; and / or The insulating sleeve has a thermal conductivity of 20-40 W / mK and a coefficient of thermal expansion of 2.5-3.5 (*10). -6 / K).

4. The insulating sleeve as described in claim 1, characterized in that, The first main body is provided with a first anti-rotation structure, which is used to cooperate with the installation medium.

5. The insulating sleeve as described in claim 4, characterized in that, The first anti-rotation structure is configured as an anti-rotation lug located on the outer side of the first main body and extending outward, the anti-rotation lug being used to connect with the mounting medium.

6. The insulating sleeve as described in claim 4, characterized in that, One axial end of the first main body extends inward to form a first limiting platform, which is used to limit the axial movement of the bearing.

7. A bearing assembly, characterized in that, include: The insulating sleeve as described in any one of claims 1 to 6; and The bearing has an insulating sleeve disposed on the outside of the outer ring of the bearing.

8. The bearing assembly as claimed in claim 7, characterized in that, The bearing assembly further includes a limiting ring disposed within the insulating sleeve. The limiting ring includes a second main body and a second limiting platform extending inward at one end along the axial direction of the second main body. The second main body is disposed inside the first main body, and the second limiting platform is disposed at one end near the axial direction of the insulating sleeve and is used to limit the axial movement of the bearing.

9. The bearing assembly as claimed in claim 8, characterized in that, The bearing assembly further includes a buffer pad, the two ends of which abut against the second limiting platform and the outer ring of the bearing, respectively.

10. A motor cover assembly, characterized in that, include: The cover body is provided with mounting holes; A steel sleeve is installed in the mounting hole; as well as The bearing assembly as described in any one of claims 7 to 9, wherein the bearing assembly is mounted on the steel sleeve.

11. The motor cover assembly as claimed in claim 10, characterized in that, The steel sleeve is provided with a second anti-rotation structure, which cooperates with the insulating sleeve to restrict the rotation of the insulating sleeve.

12. The motor cover assembly as claimed in claim 10, characterized in that, One axial end of the cover body extends inward to form a mounting platform, which is used to abut against one end of the insulating sleeve.

Images