A multi-gear hub motor power unit for electric vehicles

By employing a layout of two planetary gears and three brakes in the hub motor of an electric vehicle, multi-speed output is achieved, solving the problem of low motor efficiency under complex road conditions caused by a single transmission ratio, and improving the power performance and safety of electric vehicles under different road conditions.

CN114940060BActive Publication Date: 2026-03-17HEFEI UNIV OF TECH
View PDF 5 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-04-20
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

The existing hub motors for electric vehicles have a single transmission ratio, which makes it difficult to maintain high efficiency under complex and ever-changing road conditions, and thus cannot meet the power requirements of electric vehicles under different road conditions.

Method used

It adopts a layout of two sets of planetary gears and three brakes to achieve multi-speed output. The gear shifting operation is performed through hydraulic control. Combined with an unconventional arrangement of planetary gears, it reduces the size and improves the bending moment resistance, thereby enhancing adaptability.

Benefits of technology

It enables flexible switching of the motor's transmission ratio under different road conditions, improving the power performance and safety of electric vehicles in complex road conditions, and providing the convenience and reliability of multi-gear operation.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN114940060B_ABST
    Figure CN114940060B_ABST
Patent Text Reader

Abstract

This invention discloses a multi-gear hub motor power unit for electric vehicles. It features a motor, a left planetary gear train, a right planetary gear train, a first brake, a second brake, a third brake, and a wheel hub. The first and second brakes are stationary relative to the housing, while the third brake is fixed to the shaft. The three brakes alternately apply pressure to achieve gear shifting. This invention provides three forward gears, one neutral gear, and one parking gear. It also features lightweight construction, compact structure, simple shifting method, high transmission efficiency, and low assembly precision requirements. It offers a new solution for the transmission structure of existing electric vehicle hub motors, demonstrating good practical value and application prospects.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Hub motor

    CN108075603A

  • Hub motor

    CN108242866A

  • Hub motor

    CN112383186A

  • Electric wheel assembly adopting drum brake

    CN109823163A

  • High-integration inner rotor hub motor two-gear speed change system and electric automobile

    CN110091704A