Electric motor vehicle and powertrain with protection against bearing galvanic corrosion

By designing an oil guide plate that combines electrical conductivity and oil guiding functions in the powertrain of electric vehicles, the problem of electro-corrosion of motor bearings and motor shafts has been solved, achieving space optimization and improved maintenance convenience of the powertrain.

CN122137159APending Publication Date: 2026-06-02HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUAWEI TECH CO LTD
Filing Date
2024-12-02
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing electric vehicle powertrains, with limited space, cannot simultaneously incorporate conductive and oil-conducting structures, resulting in oversized structures that affect the overall vehicle layout and powertrain compatibility. Additionally, motor bearings and shafts are susceptible to electro-corrosion, reducing their service life.

Method used

Design an oil guide plate that combines electrical conductivity and oil guiding function. The oil guide plate conducts the shaft current on the motor shaft to the housing to prevent electro-corrosion, and the coolant dissipates heat from the motor shaft, simplifying the powertrain structure.

Benefits of technology

It improves the service life of motor bearings and motor shafts, simplifies the structure of the powertrain, reduces maintenance costs, and enhances the convenience of assembly, disassembly, and maintenance.

✦ Generated by Eureka AI based on patent content.

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    Figure CN122137159A_ABST
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Abstract

In the powertrain and electric vehicle for preventing bearing electro-corrosion provided in this application, the powertrain housing is used to fix the stator of the drive motor in the powertrain and to house the rotor of the drive motor. The inner side of the housing includes a bearing groove, and the outer side of the housing includes a mounting groove. The housing includes a through hole for penetrating the bottom of the bearing groove and the bottom of the mounting groove along the axial direction of the drive motor. The bearing groove is used to fix the outer ring of the motor bearing of the drive motor, and the inner ring of the motor bearing is used to fit onto the motor shaft of the drive motor. One end of the motor shaft of the drive motor passes through the motor bearing and extends into the through hole. The mounting groove is used to fix an oil guide plate, which is used to deliver coolant to the axial flow channel of the motor shaft and to electrically connect the motor shaft and the powertrain housing. The powertrain is provided with an oil guide plate that is both conductive and conductive, which can dissipate heat for the powertrain and prevent electro-corrosion of structures such as motor bearings and drive shafts.
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