CN221509318U - Motor end cover insulation assembly for preventing bearing from being electrically corroded - Google Patents
Motor end cover insulation assembly for preventing bearing from being electrically corroded Download PDFInfo
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- CN221509318U CN221509318U CN202323644918.3U CN202323644918U CN221509318U CN 221509318 U CN221509318 U CN 221509318U CN 202323644918 U CN202323644918 U CN 202323644918U CN 221509318 U CN221509318 U CN 221509318U
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- Prior art keywords
- bearing
- end cover
- insulating sleeve
- pressing plate
- motor end
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- 238000009413 insulation Methods 0.000 title claims description 18
- 238000003825 pressing Methods 0.000 claims abstract description 36
- 238000005260 corrosion Methods 0.000 claims abstract description 18
- 230000007797 corrosion Effects 0.000 claims abstract description 18
- 229910010293 ceramic material Inorganic materials 0.000 claims description 3
- 230000006978 adaptation Effects 0.000 claims 1
- 238000005536 corrosion prevention Methods 0.000 abstract description 3
- 230000000670 limiting effect Effects 0.000 description 10
- 230000001681 protective effect Effects 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000020347 spindle assembly Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- Motor Or Generator Frames (AREA)
Abstract
The utility model discloses a motor end cover insulating assembly for preventing bearing electric corrosion, which relates to the technical field of driving motors and comprises an end cover, a bearing, an insulating sleeve and a pressing plate; the inner side of the end cover is provided with a bearing chamber for assembling the bearing, and the insulating sleeve is sleeved between the bearing chamber and the bearing and realizes limit through the pressing plate. The insulating sleeve of the motor end cover insulating assembly can insulate the bearing, so that shaft current is prevented from passing through the bearing, the problem of bearing electric corrosion is prevented, and the problems of short service life or high cost of the motor bearing electric corrosion prevention scheme in the prior art are effectively solved.
Description
Technical Field
The utility model relates to the technical field of driving motors, in particular to a motor end cover insulating assembly for preventing bearing electric corrosion.
Background
The permanent magnet synchronous motor has the characteristics of high torque density, high efficiency and good reliability, and is widely applied to new energy electric automobile driving systems. The motor has asymmetric magnetic flux, static accumulation and shaft current caused by common mode voltage of the controller, so that the problem of electric erosion is caused by bearing electric breakdown, and the greater the power of the motor is, the greater the risk of bearing overcurrent is relatively.
A currently common solution to this problem is to use brushes, through which the shaft current passes without passing through bearings. However, the brushes are easily worn out, and need to be replaced periodically, which is difficult. In the prior art, an insulating mode of a ceramic bearing is adopted to prevent shaft current from being generated by discharging between the inner ring and the outer ring of the bearing, but the ceramic bearing has high cost and is not suitable for popularization. Therefore, it remains a major challenge to find an effective solution to prevent galvanic corrosion of the bearings of motors over the life cycle.
Disclosure of Invention
The utility model provides a motor end cover insulating assembly for preventing bearing electric corrosion, which aims to solve the problems of short service life or high cost of the existing motor bearing electric corrosion prevention scheme.
The utility model adopts the following technical scheme:
An insulation component for preventing bearing from electric corrosion comprises an end cover, a bearing, an insulation sleeve and a pressing plate; the inner side of the end cover is provided with a bearing chamber for assembling the bearing, and the insulating sleeve is sleeved between the bearing chamber and the bearing and realizes limit through the pressing plate.
Further, the pressing plate is sleeved outside the insulating sleeve and connected to the end cover through bolts.
Further, the outer side wall of the insulating sleeve is provided with a plurality of first key teeth which are mutually abutted with the pressing plate, and the sum of the heights of the first key teeth and the pressing plate is equal to the height of the insulating sleeve.
Further, the outer side wall of the insulating sleeve is provided with a plurality of second key teeth, and the inner side wall of the pressing plate is provided with a plurality of first key grooves matched with the second key teeth.
Further, the inner side wall of the bearing chamber is provided with a plurality of second key grooves matched with the first key teeth and the second key teeth.
Further, the plurality of first key teeth and the plurality of second key teeth are arranged in a staggered manner.
Further, the end cover is provided with a plurality of first mounting holes, the pressing plate is provided with a plurality of second mounting holes corresponding to the first mounting holes, and the bolts penetrate through the first mounting holes and the second mounting holes from the outer side of the end cover, so that the insulating sleeve and the pressing plate are locked in the bearing chamber.
Further, an annular flange which is abutted against the bearing is arranged at the inner end part of the insulating sleeve.
Further, the insulating sleeve is made of ceramic materials.
Further, the end cap is hot sleeved outside the insulating sleeve, and the bearing is cold pressed inside the insulating sleeve.
As can be seen from the above description of the structure of the present utility model, compared with the prior art, the present utility model has the following advantages:
1. The insulating sleeve of the motor end cover insulating assembly can insulate the bearing so as to prevent shaft current from passing through the bearing, thereby preventing the bearing from being corroded electrically, and effectively solving the problems of short service life or high cost of the motor bearing electric corrosion prevention scheme in the prior art
2. The motor end cover insulating assembly comprises an end cover, an insulating sleeve and a pressing plate, wherein key teeth and key groove structures which are matched with each other are arranged among the end cover, the insulating sleeve and the pressing plate, so that axial limiting and radial limiting can be realized, and firm and reliable assembly is ensured. In addition, the insulating sleeve and the pressing plate are locked in the bearing chamber from the outer side of the end cover through the bolts, so that the assembly process is simplified, and the replacement of parts is facilitated.
Drawings
FIG. 1 is a schematic cross-sectional view of the present utility model.
FIG. 2 is a schematic cross-sectional view of a spindle assembly according to the present utility model.
Fig. 3 is a schematic structural view of the tail shaft in the present utility model.
Fig. 4 shows a motor end cap according to the present utility model the insulating assembly is schematically illustrated in cross-section.
Fig. 5 is a schematic structural view of a front end cover in the present utility model.
Fig. 6 is a schematic structural view of an insulating sleeve according to the present utility model.
FIG. 7 is a schematic view of a platen according to the present utility model.
Fig. 8 shows a motor end cap according to the present utility model the conductive assembly is schematically illustrated in cross-section.
Fig. 9 is a schematic structural view of a conductive ring in the present utility model.
In the figure:
1-a shell;
2-a spindle assembly; 21-a rotating shaft; 211-annular protrusion; 212-bearing position; 213-limit teeth; 22-front bearing; 23-rear bearings; 24-tail shaft; 241-inner circular hole; 242-limit grooves; 243-boss;
3-motor end cap insulation assembly; 31-front end cap; 311-front bearing chamber; 312-second keyway; 313-a first mounting hole; 32-insulating sleeves; 321-first key teeth; 322-second key teeth; 323-an annular flange; 33-pressing plate; 331-first keyway; 332-a second mounting hole;
4-a motor end cap conductive assembly; 41-a rear end cap; 411-rear bearing chamber; 412-an annular boss; 413-an annular groove; 42-conducting rings; 421-conductive ring body; 422-bundles of conductive fibers; 423-radial mounting holes; 424-mounting a counter bore; 43-a protective cover; 431-yielding recess; 432-annular step surface.
Detailed Description
Specific embodiments of the present utility model will be described below with reference to the accompanying drawings. Numerous details are set forth in the following description in order to provide a thorough understanding of the present utility model, but it will be apparent to one skilled in the art that the present utility model may be practiced without these details.
As shown in fig. 1, the present embodiment provides a motor for preventing electric corrosion of bearings at both ends, comprising a housing 1, a rotary shaft assembly 2, and a motor end cover insulating assembly 3. The rotating shaft assembly 2 comprises a rotating shaft 21 and a bearing sleeved outside the rotating shaft 21; the motor end cover insulation assembly 3 comprises an end cover, an insulation sleeve 32 and a pressing plate 33; the end cover is detachably arranged at the end part of the casing 1 through bolts, a bearing chamber for assembling a bearing is arranged on the inner side of the end cover, and an insulating sleeve 32 is sleeved between the bearing chamber and the bearing and realizes limit through a pressing plate 33. The insulating sleeve 32 of the present utility model is capable of insulating the bearing to prevent shaft current from passing through the bearing, thereby preventing problems of galvanic corrosion of the bearing.
As shown in fig. 1, in the present embodiment, the motor end cover insulating assembly 3 is disposed at the front end of the casing 1, so that the end cover is a front end cover 31 disposed at the front end of the casing 1, the bearing chamber disposed inside is a front bearing chamber 311, and the bearing is a front bearing 22 disposed at the front end of the rotating shaft 21. Of course, in other embodiments, the motor end cover insulating assembly 3 may be disposed at the rear end of the housing.
As shown in fig. 4 to 7, the outer side wall of the insulating bush 32 is alternately provided with a plurality of first key teeth 321 and second key teeth 322. The pressing plate 33 is sleeved outside the insulating sleeve 32, and the end part of the pressing plate 33 is mutually abutted with the first key gear 321, so that the pressing plate 33 plays a role in axially limiting the insulating sleeve 32, and in order to ensure that the end part of the pressing plate 33 is mutually flush with the end part of the insulating sleeve 32, the sum of the heights of the pressing plate 33 and the first key gear 321 is equal to the height of the insulating sleeve 32. The inner side wall of the pressing plate 33 is provided with a plurality of first key grooves 331 matched with the second key teeth 322, so that the pressing plate 33 plays a radial limiting role on the insulating sleeve 32. The inner side wall of the front bearing chamber 311 is provided with a plurality of second key grooves 312 matched with the first key teeth 321 and the second key teeth 322, so that the front end cover 31 can also play a role in radial limiting on the insulating sleeve 32. As a preferred solution, the plurality of first key teeth 321 and the plurality of second key teeth 322 are staggered with each other, so that the insulation sleeve 32 can be ensured to be more firmly matched with the front end cover 31 and the pressing plate 33, thereby improving the reliability and stability of the motor end cover insulation assembly 3.
As shown in fig. 1 and 4 to 7, the pressing plate 33 is connected to the front cover 31 by bolts, specifically, the front cover 31 is provided with a plurality of first mounting holes 313, the pressing plate 33 is provided with a plurality of second mounting holes 332 corresponding to the first mounting holes 313, and the bolts penetrate from the outer side of the front cover 31 to the first mounting holes 313 and the second mounting holes 332, thereby locking the insulating bush 32 and the pressing plate 33 in the front bearing chamber 311. The first mounting hole 313 is designed as a counter bore for aesthetic purposes on the outside of the front end cover 31. Based on the installation mode, when the motor end cover insulating assembly 3 is dismounted, the motor end cover insulating assembly can be operated only by the outer part of the front end cover 31, and the assembly process is greatly simplified. When the insulating sleeve 32 or the pressing plate 33 is damaged, only the single pair needs to be replaced, the whole front end cover 31 does not need to be replaced, and the production cost is effectively reduced.
As shown in fig. 1 and 8, the motor end cover conductive assembly 4 is further disposed at the rear end of the casing 1, the motor end cover conductive assembly 4 includes a rear end cover 41, a conductive ring 42 and a rear bearing 23 disposed at the rear end of the rotating shaft 21, the rear end cover 41 is detachably disposed at the rear end of the casing 1 through bolts, a rear bearing chamber 411 for assembling the rear bearing 23 is disposed at the inner side of the rear end cover 41, and the conductive ring 42 is detachably disposed in the rear bearing chamber 411 and is mutually communicated with the rotating shaft 21. In this embodiment, the conductive ring 42 of the conductive assembly 4 of the motor end cover conducts the rotating shaft 21 with the casing 1, so as to drain the shaft current to the ground, thereby further achieving the purpose of eliminating the shaft current and preventing the bearing from being corroded electrically.
As shown in fig. 1 to 3, the specifications of the conductive ring 42 and the rotating shaft 21 in the prior art need to be matched with each other, so that when the conductive ring 42 with different specifications is replaced, the conductive ring 42 needs to be replaced together with the whole rotating shaft 21, which not only is troublesome to operate, but also increases the cost of enterprises. The utility model therefore proposes the design concept of the tail shaft 24, a detachable tail shaft 24 being provided at the other end of the rotary shaft 21, and the rotary shaft 21 being in communication with the conductive ring 42 via the tail shaft 24. When the conducting rings 42 with different specifications are required to be replaced, only the tail shaft 24 matched with the conducting rings is required to be replaced, and the whole rotating shaft 21 is not required to be replaced, so that the operation process is effectively simplified, and the production cost is reduced.
As shown in fig. 1 to 3, the tail shaft 24 is provided with an inner circular hole 241 for connecting with the rotating shaft 21, and the side wall of the inner circular hole 241 is provided with at least one limit groove 242; the other end of the rotating shaft 21 is provided with an annular protruding part 211 for installing the tail shaft 24, and the annular protruding part 211 is provided with a limiting tooth 213 matched with a limiting groove 242. The tail shaft 24 is sleeved on the annular protruding portion 211, and the limiting teeth 213 and the limiting grooves 242 are matched with each other, so that radial and axial limiting between the tail shaft 24 and the rotating shaft 21 is achieved, and firm connection between the tail shaft 24 and the rotating shaft 21 is ensured. The end of the tail shaft 24 is provided with a boss 243 inserted in the conducting ring 42, and the structure of the boss 243 can be matched and designed according to the specification of the conducting ring 42, so that the structural design of the tail shaft 24 is more flexible and the adaptability is higher.
As shown in fig. 1 and 8, a window is provided in the middle of the rear cover 41, and a shield 43 for closing the window is provided. The shield 43 is provided with a recess 431 for mounting the conductive ring 42 inside, and the conductive ring 42 is disposed in the recess 431 by a bolt. When the conductive ring 42 or the tail shaft 24 needs to be replaced, only the protective cover 43 needs to be disassembled, so that the operation is simpler and more convenient, and the installation process is simplified. In order to improve the sealing performance between the protective cover 43 and the rear end cover 41, the rear end cover 41 is provided with an annular boss 412 at the peripheral edge of the window, and an annular step surface 432 adapted to the annular boss 412 is provided on the inner side of the protective cover 43. In addition, the outer side wall of the rear cover 41 is further provided with an annular groove 413, and the shield 43 is detachably disposed in the annular groove 413 by bolts.
As shown in fig. 1, 8 and 9, the conductive ring 42 includes a conductive ring body 421 and a conductive fiber bundle 422, a plurality of radial mounting holes 423 are provided on a sidewall of the conductive ring body 421, the conductive fiber bundle 422 is fusion welded in the radial mounting holes 423, and the conductive fiber bundle 422 is reliable and wear-resistant, and can be conducted with the tail shaft 24, so as to guide the shaft current to the grounding point of the rear end cover 41. The upper body of the conductive ring 42 is further provided with a plurality of mounting counter bores 424, and bolts pass through the mounting counter bores 424 and are connected to the relief recesses 431 of the protective cover 43.
As shown in fig. 1, 3, 4, 6 and 8, the adjacent components are connected by hot sheathing or cold pressing. Specifically: bearing positions 212 for installing a front bearing 22 and a rear bearing 23 are arranged at two ends of the rotating shaft 21, and the front bearing 22 and the rear bearing 23 are thermally sleeved on the bearing positions 212 of the rotating shaft 21; the front bearing chamber 311 of the front end cover 31 is thermally sleeved outside the insulating sleeve 32, and the rear bearing chamber 411 of the rear end cover 41 is thermally sleeved outside the rear bearing 23; the tail shaft 24 is thermally sleeved on the annular convex part 211 of the rotating shaft 21. The inner end of the insulating sleeve 32 is provided with an annular flange 323 abutting against the front bearing 22, and the front bearing 22 is cold-pressed inside the insulating sleeve 32.
As shown in fig. 1, the insulating cover 32 is preferably made of a ceramic material such as alumina, and thus has a good insulating effect.
As shown in fig. 1, as a preferable scheme: the tail shaft 24 is made of conductive metal such as copper rod, and thus has good conductivity, and can be conducted with the conductive ring 42 as an extension of the rotating shaft 21.
The foregoing is merely illustrative of specific embodiments of the present utility model, but the design concept of the present utility model is not limited thereto, and any insubstantial modification of the present utility model by using the design concept shall fall within the scope of the present utility model.
Claims (10)
1. An insulating subassembly of motor end cover that prevents bearing electric corrosion, its characterized in that: comprises an end cover, a bearing, an insulating sleeve and a pressing plate; the inner side of the end cover is provided with a bearing chamber for assembling the bearing, and the insulating sleeve is sleeved between the bearing chamber and the bearing and realizes limit through the pressing plate.
2. A motor end cap insulation assembly for preventing galvanic corrosion of a bearing as recited in claim 1, wherein: the pressing plate is sleeved outside the insulating sleeve and connected to the end cover through bolts.
3. A motor end cap insulation assembly for preventing galvanic corrosion of a bearing as recited in claim 2, wherein: the outer side wall of the insulating sleeve is provided with a plurality of first key teeth which are mutually abutted with the pressing plate, and the sum of the heights of the first key teeth and the pressing plate is equal to the height of the insulating sleeve.
4. A motor end cap insulation assembly for preventing galvanic corrosion of a bearing according to claim 3, wherein: the outer side wall of insulating cover is equipped with a plurality of second key teeth, the inside wall of clamp plate be equipped with a plurality of with second key tooth looks adaptation first keyway.
5. A motor end cap insulation assembly for preventing galvanic corrosion of a bearing as recited in claim 4, wherein: the inner side wall of the bearing chamber is provided with a plurality of second key grooves matched with the first key teeth and the second key teeth.
6. A motor end cap insulation assembly for preventing galvanic corrosion of a bearing as recited in claim 4, wherein: the plurality of first key teeth and the plurality of second key teeth are arranged in a staggered mode.
7. A motor end cap insulation assembly for preventing galvanic corrosion of a bearing as recited in claim 2, wherein: the end cover is provided with a plurality of first mounting holes, the pressing plate is provided with a plurality of second mounting holes corresponding to the first mounting holes, and the bolts penetrate through the first mounting holes and the second mounting holes from the outer side of the end cover, so that the insulating sleeve and the pressing plate are locked in the bearing chamber.
8. A motor end cap insulation assembly for preventing galvanic corrosion of a bearing as recited in claim 1, wherein: an annular flange which is abutted with the bearing is arranged at the inner end part of the insulating sleeve.
9. A motor end cap insulation assembly for preventing galvanic corrosion of a bearing as recited in claim 1, wherein: the insulating sleeve is made of ceramic materials.
10. A motor end cap insulation assembly for preventing galvanic corrosion of a bearing as recited in claim 1, wherein: the end cover is hot sleeved outside the insulating sleeve, and the bearing is cold-pressed inside the insulating sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323644918.3U CN221509318U (en) | 2023-12-29 | 2023-12-29 | Motor end cover insulation assembly for preventing bearing from being electrically corroded |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323644918.3U CN221509318U (en) | 2023-12-29 | 2023-12-29 | Motor end cover insulation assembly for preventing bearing from being electrically corroded |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221509318U true CN221509318U (en) | 2024-08-09 |
Family
ID=92130793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323644918.3U Active CN221509318U (en) | 2023-12-29 | 2023-12-29 | Motor end cover insulation assembly for preventing bearing from being electrically corroded |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221509318U (en) |
-
2023
- 2023-12-29 CN CN202323644918.3U patent/CN221509318U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |