CN209823554U

CN209823554U - Conductive framework oil seal structure

Info

Publication number: CN209823554U
Application number: CN201920782109.3U
Authority: CN
Inventors: 刘蕾; 高正斐; 江青松
Original assignee: Hefei JEE Power System Co Ltd
Current assignee: Hefei JEE Power System Co Ltd
Priority date: 2019-05-28
Filing date: 2019-05-28
Publication date: 2019-12-20
Anticipated expiration: 2029-05-28

Abstract

The utility model discloses a conductive framework oil seal structure, which comprises a casing, an end cover, a stator and a rotor, wherein the casing is of a hollow structure, and the two ends of the casing are respectively matched with the end cover; the stator is arranged in the shell; the rotor is arranged in the shell and is coaxially arranged with the stator; the end cover comprises a front end cover and a rear end cover; the front end cover is provided with a shaft hole; a mandrel of the rotor is matched in the shaft hole and matched with the shaft hole through a bearing; an oil seal is also arranged at the orifice of the shaft hole; the oil seal is a conductive oil seal; the charges on the machine shell and the rotor are transmitted to the machine shell through the conductive oil seal; the housing is provided with a connection to ground. This structure is integrated as electrically conductive oil blanket with oil blanket and carbon brush structure for the oil blanket not only can dustproof and waterproof, can also play electrically conductive effect, and the bearing of protection motor reduces the galvanic corrosion and inefficacy promotes the life of bearing.

Description

Conductive framework oil seal structure

Technical Field

The utility model relates to a motor seal structure field, especially a skeleton oil blanket structure that can electrically conduct.

Background

The output shaft end of the motor generally adopts an oil seal or shaft seal structure, and is waterproof and dustproof. The motor adopts a brush structure to release electric charge between the motor shell and the shaft, or the motor does not use a brush, and abnormal sound or failure of a bearing caused by electric corrosion can exist. Moreover, the installation, replacement and replacement of the electric brush are complicated.

The conductive oil seal can play a role in dust prevention and water prevention, and can release charges between the shell and the shaft to protect the bearing. At present, the oil seal or the shaft seal structure is made of rubber or polytetrafluoroethylene, and both the rubber and the polytetrafluoroethylene cannot play a role in electric conduction. The conducting ring and the electric brush are independently installed, and the waterproof, dustproof and oilproof effects cannot be achieved.

The prior art is realized oil blanket and conductive brush separately, and prior art's shortcoming lies in: the oil seal and the electric brush are respectively installed, grinding dust exists between the carbon brush and the rotating shaft, and the carbon brush is not easy to detach.

Disclosure of Invention

The utility model aims at providing a skeleton oil blanket structure that can electrically conduct has solved the problem of carbon brush and oil blanket structural separation.

The technical scheme of the utility model is that: the utility model provides a skeleton oil blanket structure that can electrically conduct, includes casing, end cover, stator, rotor, its characterized in that: the shell is of a hollow structure, and two ends of the shell are respectively matched with an end cover; the stator is arranged in the shell; the rotor is arranged in the shell and is coaxially arranged with the stator; the end cover comprises a front end cover and a rear end cover; the front end cover is provided with a shaft hole; a mandrel of the rotor is matched in the shaft hole, and the mandrel is matched with the shaft hole through a bearing; an oil seal is also arranged at the orifice of the shaft hole; the oil seal is a conductive oil seal; the electric charges on the shell and the rotor are conducted to the shell through the conductive oil seal; the housing is provided with a grounded connection.

Preferably, the rear end cover is fixed to the casing by bolts.

Preferably, the front end of the mandrel is provided with a spline, and the rear end of the mandrel is matched with the rear end cover through a sealing element and a bearing assembly.

The utility model has the advantages that: combine oil blanket and carbon brush structure, integrated electrically conductive oil blanket for the oil blanket not only can be dustproof and waterproof, can also play electrically conductive effect. Therefore, the bearing of the motor is protected, the failure caused by electric corrosion is reduced, and the service life of the bearing is prolonged.

Drawings

The invention will be further described with reference to the following drawings and examples:

FIG. 1 is a cross-sectional view of an electrically conductive backbone oil seal configuration;

FIG. 2 is a structural view of a conductive oil seal

Wherein: 1. a housing; 2. a front end cover; 3. a conductive oil seal; 4. a bearing; 5. a stator; 6. and a rotor.

Detailed Description

The utility model discloses a preferred embodiment:

a conductive framework oil seal structure comprises a machine shell 1, an end cover, a conductive oil seal 3, a bearing 4, a stator 5, a rotor 6 and other related structures. The conductive oil seal 3 is arranged in the end cover, and can play a role in dust prevention and water prevention firstly, the second point can play a role in leading the motor to run, the electric charge gathered by the shell 1 and the rotor 6 is conducted from the rotating shaft to the shell, and the shell is grounded again, so that the potential difference between the shell 1 and the rotor 6 is ensured to be very small, and the bearing is prevented from being failed due to the fact that the electric charge gathered by the shell 1 and the rotor 6 is discharged in the bearing 4.

The electric drive motor of the new energy automobile generally meets the requirement of IP67, namely the motor is waterproof and dustproof, so that the output shaft of the motor rotates and needs an oil seal or a shaft seal to meet the requirement.

The motor runs under the power-on state, and a layer of oil film exists between the balls of the bearing 4 and the inner and outer rings in the process, and the bearing is similar to a capacitor due to the gap of the oil film. The balls in the bearing 4 and the bearing outer ring have opposite charges, and when the charges are accumulated more, the voltage can break through an oil film to discharge; repeated operation can cause electrical corrosion of the bearing 4 over time, causing the bearing to fail.

In order to extend the life of the bearing 4, there are two general types of protection: firstly, insulating treatment in bearing department, the motor can choose ceramic bearing or ceramic ball bearing for use to block the production of axle current, but ceramic bearing ceramic ball bearing is comparatively expensive. Or resin type parts with insulation added in the end cap. The other way is that the shell of the motor 1 is connected with the shaft by a conductive device. The electric motor is generally characterized in that a brush is in contact with a shaft, and a lead-out wire is connected with a shell, so that charges on the shell can form a passage with the shaft, and the electric corrosion of a bearing can be reduced. However, a special brush holder structure is designed, a brush is mounted, the space for designing a general motor is narrow, and a special brush needs to be customized. In addition, the friction between the brush and the shaft can generate powder, and the powder enters the motor to generate serious problems of insufficient insulation, stator burning and the like. And the installation of brush is generally inside the motor, and the installation is comparatively loaded down with trivial details with the change.

The conductive oil seal 3 is arranged at the original motor oil seal, namely in the front end cover 2, and the oil seal structure can ensure the waterproof and dustproof sealing requirements of the motor; and the potential difference generated by the shell and the shaft is directly conducted through the carbon brush on the conductive oil seal 3 in the running process of the motor, and electric charges are released. The casing 1 is grounded, so that the motor shaft, the casing and the inner and outer rings of the bearing are grounded, the potential is basically 0, and the electric corrosion of the bearing is greatly reduced.

To sum up, this structure can the structure of integrated oil blanket and electric brush, forms a structure. The conductive oil seal is simple in structure, is arranged at the shaft extension end of the motor, and is easy to replace and disassemble. The conductive oil seal can not play a role in sealing and waterproofing, and can reduce the abnormal sound or failure of the bearing caused by electric corrosion and prolong the service life of the bearing.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical concepts of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a skeleton oil blanket structure that can electrically conduct, includes casing, end cover, stator, rotor, its characterized in that: the shell is of a hollow structure, and two ends of the shell are respectively matched with an end cover; the stator is arranged in the shell; the rotor is arranged in the shell and is coaxially arranged with the stator; the end cover comprises a front end cover and a rear end cover; the front end cover is provided with a shaft hole; a mandrel of the rotor is matched in the shaft hole, and the mandrel is matched with the shaft hole through a bearing; an oil seal is also arranged at the orifice of the shaft hole; the oil seal is a conductive oil seal; the electric charges on the shell and the rotor are conducted to the shell through the conductive oil seal; the housing is provided with a grounded connection.

2. The electrically conductive framework oil seal structure of claim 1, wherein: the rear end cover is fixed on the shell through bolts.

3. The electrically conductive framework oil seal structure of claim 1, wherein: the front end of the mandrel is provided with a spline, and the rear end of the mandrel is matched with the rear end cover through a sealing piece and a bearing assembly.