CN213270754U

CN213270754U - Bearing lantern ring for preventing motor bearing from being electrically corroded and motor

Info

Publication number: CN213270754U
Application number: CN202021679610.6U
Authority: CN
Inventors: 陈明昌; 梁其军; 张霄霆; 李志华; 王银
Original assignee: Chongqing Jinkang Power New Energy Co Ltd
Current assignee: Chongqing Jinkang Power New Energy Co Ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-05-25
Anticipated expiration: 2030-08-13

Abstract

The utility model belongs to the technical field of the motor, concretely relates to prevent bearing lantern ring of motor bearing galvanic corrosion, include: the lantern ring body is in a cylindrical shape with openings at two sides; the lantern ring body is provided with an insulating layer formed by hard anodic oxidation treatment; the insulating layer covers at least the inside surface or the outside surface of the collar body. Compare with the scheme that has adopted insulating cover or spraying insulating layer now, the utility model discloses a carry out stereoplasm anodic treatment to the lantern ring body, make insulating layer direct molding on the lantern ring, partly cover the surface of lantern ring body of insulating layer, inside another part infiltration advanced lantern ring body. The insulating layer and the lantern ring body are high in connection strength and not easy to fall off; the insulating layer subjected to hard anodizing has high hardness, good wear resistance, high heat conductivity coefficient, good heat dissipation performance and long service life.

Description

Bearing lantern ring for preventing motor bearing from being electrically corroded and motor

Technical Field

The utility model relates to the technical field of electric machines, concretely relates to prevent motor bearing electric corrosion's bearing lantern ring and motor.

Background

The motor structurally comprises a cylindrical shell with an opening on one side, a rotating shaft arranged in the shell and an end cover for plugging the shell. One end of the rotating shaft is fixed on a bearing seat at the bottom of the shell through a first bearing, and the other end of the rotating shaft is fixed in a bearing hole in the end cover through a second bearing. The motor rotor generates induced potential due to electromagnetic induction, and the induced potential forms a current closed loop through the rotor core, the rotating shaft, the first bearing, the shell, the end cover and the second bearing. In the bearing structure, because the rolling bodies with charges are in line contact or point contact with the inner ring and the outer ring of the bearing, a large amount of charges are easily accumulated at the contact positions to form point discharge, and the bearing is easily corroded electrically and fails.

In order to solve the problem of electric corrosion of the bearing, the traditional scheme is to use insulating materials with high hardness such as ceramics to manufacture the ball, so as to avoid the electric corrosion, but the scheme has high cost and poor economic benefit. Or the generated current is guided to the outside of the motor by arranging the brush or the conducting rod, but the structure of the motor needs to be redesigned by additionally arranging the brush or the conducting rod, and an installation space for installing the brush or the conducting rod is reserved.

Therefore, the scheme of arranging the lantern ring on the motor in the prior art is that the lantern ring with the insulating layer is installed on the bearing to separate the current closed loop and prevent electric corrosion. However, in the prior art, the insulating layer is usually formed by installing the insulating sleeve on the metal lantern ring body or spraying insulating paint, the connection strength between the insulating layer and the lantern ring body is not high, and when the torque of the motor is large, the insulating layer is easy to wear and drop, so that the insulating effect is poor, and the service life is short. In addition, the new energy motor needs to have an excellent heat dissipation performance, and if the heat dissipation performance of the motor is not good, balls in the bearing deform due to overheating. And most of insulating coatings or insulating sleeves have poor heat conductivity, so that the heat dissipation performance of the whole lantern ring can be seriously influenced, and the lantern ring can not meet the heat dissipation requirement of a new energy motor.

Disclosure of Invention

To the problem that above-mentioned current insulating layer is worn and torn easily and drops, the utility model provides a prevent motor bearing galvanic corrosion's bearing lantern ring forms the insulating layer through adopting stereoplasm anodic oxidation to handle on the lantern ring body, can guarantee that the insulating layer is wear-resisting and difficult for dropping, guarantees life. And has high thermal conductivity and strong heat dissipation capability.

The scheme of the utility model is as follows:

a bearing collar to prevent electrical corrosion of a motor bearing, comprising: a collar body having an insulating layer formed by hard anodizing; the insulating layer covers at least the inside surface or the outside surface of the collar body.

Preferably, the insulating layer includes:

an outer cover layer covering at least an inside surface or an outside surface of the collar body;

an inner permeable layer that permeates into the interior of the collar body.

Preferably, the retainer ring is a flanging structure formed by one end of the lantern ring body facing inwards or outwards.

Preferably, the insulating layer integrally wraps the collar body and the retainer ring.

Preferably, a machining allowance is left on one side of the lantern ring body, which forms the insulating layer.

Preferably, the material of the lantern ring body is aluminum alloy.

An electric machine comprising:

the shell is in a cylindrical shape with an opening at one side, and a bearing seat is arranged at the bottom of the shell;

an end cap for sealing the housing; the end cover is provided with a bearing hole;

the rotating shaft is arranged in the shell, one end of the rotating shaft is connected with the bearing seat through a first bearing, and the other end of the rotating shaft is connected with the bearing hole through a second bearing;

the first bearing or the second bearing is provided with the lantern ring.

Preferably, the collar is arranged between the outer ring of the first bearing and the bearing seat; the insulating layer is formed on at least an inner side surface or an outer side surface of the collar body.

Preferably, the lantern ring is arranged between the outer ring of the second bearing and the bearing hole; the insulating layer is formed on at least an inner side surface or an outer side surface of the collar body.

Preferably, the sleeve ring is arranged between the rotating shaft and the first bearing or between the rotating shaft and the second bearing; the insulating layer is formed on at least an inner side surface or an outer side surface of the collar body.

Compare with the scheme that has adopted insulating cover or spraying insulating layer now, the utility model discloses a carry out stereoplasm anodic oxidation to the aluminum alloy lantern ring body and handle, make insulating layer direct forming on the lantern ring, partly cover the surface of lantern ring body of insulating layer, it is internal that another part permeates into the lantern ring body. The insulating layer and the lantern ring body form an integral structure, so that the connecting strength is high, and the insulating layer is not easy to fall off; the insulating layer processed by hard anodic oxidation has high hardness, good wear resistance and high insulativity, can meet the requirements of impact resistance and wear resistance of a large-torque motor, and has long service life. And the insulating layer formed by hard anodic oxidation contains a compact uniform and ordered crystal structure or charge carriers required by heat transfer, and has high heat conductivity and good heat dissipation performance.

Drawings

FIG. 1 is a schematic structural view of a collar body being flanged inward to form a retainer ring;

FIG. 2 is a schematic structural view of the collar body being flanged outward to form a retainer ring;

FIG. 3 is a schematic view of the structure of the collar with insulating layers formed on the inner and outer sides;

FIG. 4 is a schematic structural diagram of an insulating layer formed on the outer surface of the collar;

FIG. 5 is a schematic view of an insulating layer formed on the inner surface of the collar;

FIG. 6 is a schematic view showing the structure of the collar installation position in the first embodiment;

FIG. 7 is a schematic structural view showing a mounting position of a grommet according to a second embodiment;

FIG. 8 is a schematic structural view of a mounting position of a grommet in the third embodiment.

In the figure, a collar 1, a collar body 11, a retainer ring 12, an insulating layer 13, an outer covering layer 131, an inner permeable layer 132, a housing 2, a bearing seat 21, an end cover 3, a bearing hole 31, a rotating shaft 4, a first bearing 5 and a second bearing 6.

Detailed Description

The following is further detailed by the specific embodiments:

example one

As shown in fig. 1 and 2, a lantern ring 1 for preventing electric corrosion of a motor bearing comprises a tubular lantern ring body 11, wherein the lantern ring body 11 is of a tubular structure made of metal, and both sides of the lantern ring body 11 are provided with openings, so that the lantern ring body is conveniently sleeved on parts of a motor. An insulating layer 13 is formed on the collar body 11 by hard anodizing on the collar body 11.

As shown in fig. 3 to 5, the insulating layer 13 may be molded at least on the inner surface or the outer surface of the ferrule body 11 depending on the mounting position of the ferrule 1, and it is needless to say that the metal ferrule body 11 may be insulated by wrapping the ferrule body 11 with the insulating layer 13. When the lantern ring 1 is installed on a bearing of a motor, a current closed loop formed among the shell 2, the end cover 3, the bearing and the rotating shaft 4 can be isolated, so that current cannot form a loop on the motor. The ball in the bearing can not generate point discharge effect because of point contact, and the ball is prevented from being electrically corroded.

An insulating layer 13 is formed on the collar body 1 by hard anodizing, and a portion of the insulating layer 13 penetrates into the collar body 11, so that the insulating layer 13 forms an outer covering layer 131 covering the collar body 11 and an inner penetration layer 132 penetrating into the collar body 11. Compare with the mode of spraying the insulating layer or addding the insulating cover on the lantern ring 1 among the prior art, the internal permeation layer 132 of this scheme guarantees that the joint strength of lantern ring body 1 and insulating layer is higher, can adapt to great moment of torsion, and insulating layer 13 can not drop from lantern ring body 11 easily to the hardness through stereoplasm anodic oxidation treatment's outside overburden 131 is high, difficult wearing and tearing, long service life, in addition, the insulating layer has good heat conductivity, and heat dispersion is good.

In the present embodiment, an aluminum alloy is preferably used as the molding material of the collar body 11. Taking the lantern ring body 11 made of 6061Al as an example, the surface of the lantern ring body is degreased and cleaned, and then the lantern ring body 11 is put into electrolyte. Then, the collar body 11 is used as an anode, an aluminum plate is used as a cathode, and oxidation voltage is applied to perform hard anodic oxidation treatment to form an oxide film layer. The crystal structure of the oxide film layer is ordered, the heat conductivity coefficient is high, the heat dissipation performance is good, and the hardness of the surface of the lantern ring can effectively meet the requirements of a new energy motor. If it is only necessary to form an oxide film layer on the inner surface or the outer surface of the collar body 11, it is necessary to shield a surface portion of the collar body 11 where the oxide film layer is not necessary to be formed.

As shown in fig. 1 and 2, a retainer ring 12 is further disposed on the collar body 11 to separate the bearing seat 21 from the end surface of the bearing, the retainer ring 12 is a flange formed inward or outward at one end of the collar body 11, and the insulating layer 13 on the retainer ring 12 is identical to the insulating layer 13 on the collar body 11.

In the prior art, there are two bearings installed on the rotating shaft 4, one end of the rotating shaft 4 is connected with the bearing seat 21 at the bottom of the housing 2 through the first bearing 5, and the other end is installed in the bearing hole 31 on the end cover 3 through the second bearing 6. As shown in fig. 6, the collar 1 in the present embodiment is mounted on the outer race of the first bearing 5 to block a current loop formed between the rotating shaft 4, the first bearing 5, the housing 2, the end cap 3, and the second bearing 6. And the insulating layer 13 is formed at least on the inner side surface or the outer side surface of the collar body 11.

As shown in fig. 3, when the insulating layer 13 wraps the collar body 11, the insulating effect of the collar 1 can be effectively ensured. However, when the collar body 11 is treated by hard anodizing, the insulating layer 13 formed causes a change in the size of the collar body 11, and therefore, it is necessary to provide a machining margin for the insulating layers 13 located on the inner and outer side surfaces of the collar body 11. When the bearing sleeve is installed, the insulating layers 13 on the inner side surface and the outer side surface of the sleeve ring 1 need to be polished, so that the inner side surface and the outer side surface of the sleeve ring 1 respectively meet the matching sizes with the bearing outer ring and the bearing seat 21. Since the insulating layer 13 subjected to the hard anodizing treatment has high hardness, it is necessary to perform processing by grinding, which makes processing difficult. And the grinding time of the inner and outer side surfaces of the collar 1 is long, which affects the production efficiency. Therefore, in the actual production process, it is preferable to provide the insulating layer 13 only on the inner side surface or the outer side surface of the grommet 1.

In the present embodiment, the bearing is a standard component, and its size is well defined, so during the installation process, it is necessary to consider the matching of the bearing and the collar 1, and as shown in fig. 4, it is preferable to dispose the insulating layer 13 on the outer side surface of the collar body 11. When the insulating layer 13 is formed on the outer side surface of the lantern ring body 11, the hardness of the inner side surface of the lantern ring body 11 is low, the processing is convenient, and the insulating layer can be effectively matched with the bearing outer ring. And machining allowance is reserved on the insulating layer 13 on the outer side surface of the lantern ring body 11, so that the installation size of the lantern ring 1 and the bearing seat 21 is ensured. Alternatively, as shown in fig. 5, the insulating layer 13 may be provided on the inner surface of the collar body 11, and the collar 1 may be preferentially attached to the bearing housing 21. And machining allowance is reserved on the insulating layer 13 on the inner side surface of the lantern ring body 11, so that the inner side surface of the lantern ring 1 is matched with the bearing outer ring.

In this embodiment, because the bearing is the standard component, consequently, need carry out reaming processing to current bearing frame 21, process out the space that is used for installing lantern ring 1 on bearing frame 21, lantern ring 1 occupies the space of the original bearing frame 21 of casing 2, compares with the scheme that sets up brush and conducting rod, need not to set up in addition installation space and holds lantern ring 1.

When the bearing is mounted on the bearing housing 21, the outer race of the first bearing 5 can be insulated from the inner side surface of the bearing housing 21, but the end surface of the first bearing 5 may come into contact with the bottom surface of the bearing housing 21. In this embodiment, the retainer ring 12 is a flanged structure formed inward at one end of the collar body 11 to block the end surface of the first bearing 5 extending into the bearing seat 21, so as to prevent the end surface of the first bearing 5 from contacting the bearing seat 21. Because the retainer ring 12 is a flanging formed by the lantern ring body 11, the insulating layer 13 on the retainer ring 12 is consistent with the insulating layer 13 on the lantern ring body 11, and when the insulating layer 13 on the lantern ring body 11 is arranged on the inner side surface, the insulating layer 13 on the retainer ring 12 is also formed on the same side surface; an insulating layer 13 is arranged on the outer side surface of the lantern ring body 11, or the insulating layer 13 wraps the lantern ring body 11, and the retainer ring 12 is also arranged in the same way.

Example two

The embodiment is the same as the embodiment that the lantern ring 1 is arranged on the bearing outer ring; except that the collar 1 in this embodiment is mounted on a second bearing 6 which connects the shaft 4 to the end cap 3, as shown in figure 7.

In locating the bearing hole 31 on second bearing 6 and end cover 3 with lantern ring 1, form insulating between second bearing 6 and end cover 3, avoid forming current loop between pivot 4, first bearing 5, casing 2, end cover 3 and second bearing 6, prevent that the ball in first bearing 5 and the second bearing 6 from forming point discharge effect because of the point contact, can not take place the galvanic corrosion, guarantee the life of bearing.

The insulating layer 13 in this embodiment is provided at least on the inside surface or the outside surface of the collar body 11. When insulating layer 13 covers whole lantern ring body 11, can effectively guarantee the insulating effect of lantern ring 1, but need leave the processing allowance on the insulating layer 13 of lantern ring 1 both sides, need process the insulating layer 13 of the surface of lantern ring body 11 inside and outside during the installation, lead to production efficiency low.

Therefore, in practical use, the insulating layer 13 may be disposed on the inner side surface or the outer side surface of the collar body 11 according to the installation requirement in the first embodiment. For example, the insulating layer 13 is provided on the outer side surface of the collar body 11, and the fitting between the collar 1 and the second bearing 6 is prioritized. Or the insulating layer 13 is provided on the inner side surface of the collar body 11, taking priority to the fitting of the collar 1 to the bearing hole 31. For the installation of the collar 1, the bearing hole 31 of the existing end cap 3 needs to be reamed.

EXAMPLE III

As shown in fig. 8, the collar 1 in this embodiment is provided on the inner race of the bearing. The collar 1 may be disposed between the shaft 4 and the first bearing 5 or between the shaft 4 and the second bearing 6 depending on the mounting position. In addition, the retainer ring 12 in this embodiment is a flanged structure formed at one end of the collar body 11 outward to prevent the end surface of the bearing from contacting the shoulder of the rotating shaft 4.

Note that the insulating layer 13 may be provided in the manner described in the first and second embodiments. For example, an insulating layer 13 is provided on both the inner and outer side surfaces of the collar body 11 and the retainer ring 12.

Alternatively, the fitting of the collar 1 to the first bearing 5 or the second bearing 6 is prioritized such that the outer side surface of the collar body 11 directly fits the inner race of the first bearing 5 or the second bearing 6. An insulating layer 13 is arranged on the inner side surface of the lantern ring body 11, and machining allowance is reserved so as to meet the installation requirement of the rotating shaft 4. The insulating layer 13 on the collar 12 is now also provided on the inside surface.

Alternatively, an insulating layer 13 is provided on the outer side surface of the collar body 11, and the collar body 11 is preferentially mounted on the rotating shaft 4; the outer surface insulation layer 13 of the collar body 11 is then machined again to form a fit with the inner race of the first bearing 5 or the second bearing 6. The insulating layer 13 on the stopper 12 is now provided on the outer side surface, facilitating the integral molding of the insulating layer 13.

In this embodiment, the first bearing 5 and the second bearing 6 are standard parts, so for the mounting of the collar 1, journals need to be provided on the bearings to meet the mounting requirements.

The invention is not limited solely to that described in the specification and the embodiments, and additional advantages and modifications will readily occur to those skilled in the art, and it is not intended to be limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.

Claims

1. A bearing collar to prevent electrical corrosion of a motor bearing, comprising: the lantern ring body is characterized by comprising an insulating layer formed by hard anodizing, wherein the insulating layer at least covers the inner side surface or the outer side surface of the lantern ring body.

2. A bearing collar to prevent electrical corrosion of a motor bearing as claimed in claim 1, wherein: the insulating layer includes:

an inner permeable layer that permeates into the interior of the collar body.

3. A bearing collar to prevent electrical corrosion of a motor bearing as claimed in claim 2, wherein: the retainer ring is a flanging structure formed by inward or outward one end of the lantern ring body.

4. A bearing collar to prevent electrical corrosion of a motor bearing as claimed in claim 3, wherein: the insulating layer wraps the lantern ring body and the check ring integrally.

5. A bearing collar to prevent galvanic corrosion of a motor bearing according to claim 3 or 4, wherein: and machining allowance is reserved on one side of the lantern ring body, which forms the insulating layer.

6. A bearing collar to prevent galvanic corrosion of a motor bearing according to claim 5, wherein: the lantern ring body is made of aluminum alloy.

7. An electric machine comprising:

characterised in that the first bearing or the second bearing is provided with a collar according to any one of claims 1 to 6.

8. The electric machine of claim 7, wherein: the lantern ring is arranged between the outer ring of the first bearing and the bearing seat; the insulating layer is formed on at least an inner side surface or an outer side surface of the collar body.

9. The electric machine of claim 7, wherein: the lantern ring is arranged between the outer ring of the second bearing and the bearing hole; the insulating layer is formed on at least an inner side surface or an outer side surface of the collar body.

10. The electric machine of claim 7, wherein: the lantern ring is arranged between the rotating shaft and the first bearing or between the rotating shaft and the second bearing; the insulating layer is formed on at least an inner side surface or an outer side surface of the collar body.