CN212063784U

CN212063784U - Motor end cover conductive brush structure for protecting bearing

Info

Publication number: CN212063784U
Application number: CN202020752779.3U
Authority: CN
Inventors: 付红玲; 李金春; 朱巍巍
Original assignee: Jiangsu Yunyi Electric Co Ltd
Current assignee: Jiangsu Yunyi Electric Co Ltd
Priority date: 2020-05-09
Filing date: 2020-05-09
Publication date: 2020-12-01
Anticipated expiration: 2030-05-09

Abstract

The utility model discloses a motor end cover of protection bearing electrically conducts brush structure. The motor comprises a conductive brush assembly (3) arranged on a rear end cover (2) of the motor and a conductive screw (7) axially arranged at the end part of a rotating shaft (1) of the motor; the conductive brush assembly (3) comprises a rotary transformer stator pressing plate (31), a conductive brush bracket (32) and a conductive brush (34); the conductive brush (34) is formed by compressing conductive brush fibers (341) through an OT terminal (342); the tail part of the conductive brush fiber (341) is attached to the surface of a conductive screw (7) arranged on the rotating shaft (1). The utility model discloses can prevent effectively that axle current from circulating the bearing, avoid the bearing to appear the galvanic corrosion phenomenon, can effectively protect the bearing, reduce the maintenance cost in later stage, and electrically conductive brush assembly simple structure is reliable, and is small, low cost, and it is very convenient to install and dismantle, can not influence the dismouting and the normal operation of motor itself, also can not influence the assembly of motor and whole car.

Description

Motor end cover conductive brush structure for protecting bearing

Technical Field

The utility model relates to a motor brush structure specifically is a motor end cover of protection bearing leads electric brush structure.

Background

With the rapid development of economy and science in recent years, serious environmental pollution problems are brought along with the rapid development of the economy and the science, and the traditional energy is continuously reduced, so that the problems are caused by the traditional automobile, and therefore, China strengthens the development of new energy automobiles, can relieve the environmental pollution on one hand, and can promote the transformation of the automobile industry on the other hand. However, with the rapid development of the new energy automobile market, the problem of motor exposure in the core components is increasing day by day. Because of the variable frequency motor under the action of higher power voltage pulse, the voltage difference between the rotor and the stator in the motor can generate shaft voltage on the motor rotating shaft, when the shaft voltage reaches a certain value, a lubricating oil film of a motor bearing can be punctured, a conductive loop is formed between the rotor (communicated with the motor rotating shaft), the bearing inner ring, the bearing ball, the bearing outer ring and the stator (communicated with a rear end cover of the motor) in sequence instantly, high-temperature electric sparks are generated, the high-temperature electric sparks can melt the bearing inner ring and the bearing outer ring or generate a plurality of tiny grooves and other electric corrosion phenomena on the bearing ball, and finally abnormal sound and failure of the bearing can be caused, and the motor is scrapped.

The scheme for solving the electric corrosion of the bearing in the prior art comprises the following steps:

1) an insulating bearing is used, but the price is high and is about 8 times of that of a common bearing;

2) the insulating rubber is added on the inner surface of the bearing chamber of the end cover, so that on one hand, the rubber is inconvenient to install, and on the other hand, the rubber can influence the coaxiality among the shaft, the end cover and the bearing and the normal operation of the motor;

3) a conductive device is added in the motor, but the assembly and disassembly are inconvenient, and the maintenance cost is high;

4) by using the insulating end cover, on one hand, the processing cost and the installation cost (bolt installation insulation and the like) are increased, and on the other hand, the coaxiality of the end cover and the bearing cannot be ensured when the end cover is installed;

5) use the plastic motor body to insulate, on the one hand the cost is too high, and on the other hand only is fit for the minimotor of miniwatt, and electric automobile is complicated because of the service condition, and plastics intensity can't reach the requirement.

SUMMERY OF THE UTILITY MODEL

To the problem that above-mentioned prior art exists, the utility model provides a motor end cover of protection bearing electrically conducts brush structure can prevent effectively that axle current from circulating the bearing, avoids the bearing to appear the galvanic corrosion phenomenon, can effectively protect the bearing, reduces the maintenance cost in later stage. The conductive brush assembly is simple and reliable in structure, small in size, low in cost, convenient to mount and dismount, free of influence on the mounting and dismounting and normal operation of the motor and free of influence on the assembly of the motor and the whole vehicle.

In order to achieve the purpose, the motor end cover conductive brush structure comprises a conductive brush assembly arranged on a rear end cover of a motor and a conductive screw axially arranged at the end part of a rotating shaft of the motor;

the conductive brush assembly comprises a rotary transformer stator pressing plate, a conductive brush bracket and a conductive brush;

the conductive brush is formed by compressing conductive brush fibers through an OT terminal;

the fiber tail part of the conductive brush is attached to the surface of a conductive screw arranged on the rotating shaft.

Further comprises a bearing and a bearing retainer ring which are sequentially arranged on the motor rotating shaft,

the rear side of the motor rotating shaft penetrates through the bearing and the bearing retainer ring and is provided with a motor rear end cover, the bearing and the motor rear end cover are installed together in a transition fit mode, and the motor rear end cover and the motor shell are fixed together through screws.

Further, the conductive brush is locked on the conductive brush bracket through a first screw hole by a short screw; the conductive brush bracket is locked on the rotary transformer stator pressing plate through a second screw hole by a long screw; and the rotary transformer stator pressing plate is locked on the rear end cover of the motor through a third screw hole by using a screw.

Further, the conductive brush fibers are conductive carbon fibers or conductive stainless steel fibers.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the motor end cover conductive brush assembly of the utility model has very simple and reliable structure, small volume and low cost;

2. the motor end cover conductive brush assembly of the utility model is fixed on the rear end cover of the motor by screws, the assembly and disassembly are very convenient, the disassembly and assembly and the normal operation of the motor can not be influenced, and the assembly space of the motor and the whole vehicle can not be influenced;

3. the utility model discloses a conductive brush assembly structure of motor end cover can prevent effectively that axle current from circulating the bearing, avoids the bearing the galvanic corrosion phenomenon to appear, can effectively protect the bearing, reduces the maintenance cost in later stage.

Drawings

FIG. 1 is a sectional view of a motor structure with a motor end cap brush assembly according to the present invention;

FIG. 2 is an exploded view of the motor structure with the motor end cap brush assembly of the present invention;

fig. 3 is an exploded view of the structure of the electric brush assembly of the motor end cover of the present invention.

In the figure: 1. the motor comprises a motor rotating shaft, 2, a motor rear end cover, 3, a conductive brush assembly, 31, a rotary variable stator pressing plate, 311, a second screw hole, 32, a conductive brush support, 321, a first screw hole, 33, a long screw, 34, a conductive brush, 341, conductive brush fibers, 342, an OT terminal, 35, a short screw, 4, a bearing, 5, a bearing retainer ring, 6, a third screw hole, 7, a conductive screw, 8 and a motor shell.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1 to 3, the specific embodiment of the structure of the end cover conductive brush of the motor is as follows:

firstly, a motor rear end cover 2 is installed on a motor rotating shaft 1 with a bearing 4 and a bearing retainer ring 5, the bearing 4 and the motor rear end cover 2 are in transition fit, and then the motor rear end cover 2 and a motor shell 8 are fixed together by screws.

Secondly, the conductive brush 34 is locked on the conductive brush bracket 32 through the first screw hole 321 by a short screw 35 and is installed in place;

the conductive brush holder 32 with the conductive brush 34 mounted thereon is then locked to the rotary transformer stator pressing plate 31 by the long screw 33 through the second screw hole 311.

And then the assembled conductive brush assembly 3 is mounted on the rear end cover 2 of the motor through a third screw hole 6 by using a screw.

Finally, the conductive screw 7 is arranged on the motor rotating shaft 2.

Conductive brush fibre 341 afterbody and the conductive screw 7 surface laminating of installing on motor shaft 2 on the conductive brush 34 after whole installations finish, the axle current will loop through motor shaft 1, conductive screw 7, conductive brush fibre 341, OT terminal 342, conductive brush support 32, become stator clamp plate 31 soon, motor rear end cap 2, form the conductive loop, can form the equipotential between the inner circle (with motor shaft 1 contact UNICOM) and the outer lane (with motor rear end cap 2 contact UNICOM) of motor bearing 4 promptly, the axle current just can not circulate bearing 4 again, thereby can prevent that the electric corrosion phenomenon from appearing in the motor bearing, reach the purpose that the protection bearing reduces the later maintenance.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A motor end cover conductive brush structure for protecting a bearing is characterized in that,

the motor comprises a conductive brush assembly (3) arranged on a rear end cover (2) of the motor and a conductive screw (7) axially arranged at the end part of a rotating shaft (1) of the motor;

the conductive brush assembly (3) comprises a rotary transformer stator pressing plate (31), a conductive brush bracket (32) and a conductive brush (34);

the conductive brush (34) is formed by compressing conductive brush fibers (341) through an OT terminal (342);

the tail part of the conductive brush fiber (341) is attached to the surface of a conductive screw (7) arranged on the rotating shaft (1).

2. The structure of claim 1, wherein the conductive brush is a conductive brush for protecting the end cover of the motor,

also comprises a bearing (4) and a bearing retainer ring (5) which are sequentially arranged on the motor rotating shaft (1),

the rear side of the motor rotating shaft (1) penetrates through the bearing (4) and the bearing retainer ring (5) and is provided with the motor rear end cover (2), the bearing (4) and the motor rear end cover (2) are installed together in a transition fit mode, and the motor rear end cover (2) and the motor shell (8) are fixed together through screws.

3. The structure of claim 1, wherein the conductive brush is a conductive brush for protecting the end cover of the motor,

the conductive brush (34) is locked on the conductive brush bracket (32) through a first screw hole (321) by a short screw (35); the conductive brush support (32) is locked on the rotary transformer stator pressing plate (31) through a second screw hole (311) by a long screw (33); and the rotary transformer stator pressing plate (31) is locked on the rear end cover (2) of the motor through a third screw hole (6) by using a screw.

4. The structure of claim 1, wherein the conductive brush is a conductive brush for protecting the end cover of the motor,

the conductive brush fibers (341) are conductive carbon fibers or conductive stainless steel fibers.