Electric drive assembly, four-wheel drive system and vehicle

By employing a differential system and engagement components with a planetary gear reduction mechanism in the four-wheel drive system, the problems of difficulty and low efficiency in controlling the torque consistency of the left and right wheels are solved, enabling efficient switching of multiple working modes and improved stability.

CN116890633BActive Publication Date: 2026-06-09BYD CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BYD CO LTD
Filing Date
2022-03-31
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In existing four-wheel drive systems with four motors driving independently, it is difficult to control the torque consistency of the left and right wheels, and the operating efficiency is low.

Method used

The system employs first and second planetary gear reduction mechanisms. By fixing the first intermediate element and the second intermediate element together, a differential system is formed, which enables passive differential speed of the left and right wheels, absorbs fluctuations in speed and torque, and achieves multiple working modes by combining the connecting parts, including single motor drive, dual motor centralized drive and independent drive.

Benefits of technology

It improves the working efficiency of the four-wheel drive system, achieving a balance between power and economy. It has advantages such as low reverse drag, high safety redundancy, and seamless switching of working modes, thereby enhancing the vehicle's handling performance and stability.

✦ Generated by Eureka AI based on patent content.

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    Figure CN116890633B_ABST
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Abstract

The application relates to an electric drive assembly, a four-wheel drive system and a vehicle, the electric drive assembly comprising a first motor, a first planetary gear deceleration mechanism, a second motor and a second planetary gear deceleration mechanism; the first planetary gear deceleration mechanism comprises a first input element, a first output element and a first intermediate element, and the second planetary gear deceleration mechanism comprises a second input element, a second output element and a second intermediate element; the first motor is connected with the first input element, and the second motor is connected with the second input element; and the first intermediate element is fixedly connected with the second intermediate element. The electric drive assembly solves the problem that the existing four-wheel independent drive system has a large control difficulty of left and right torque consistency.
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