Boxin · Hengzhen · Botrust
Precision Manufacturing・Powering the World
New energy vehicle motor shaft
This is an electric motor shaft supplied as a component for Dongfeng Liuzhou Motor’s new‑energy vehicles. Made from 20CrMnTi alloy carburized steel, it serves as the core rotor shaft of the drive motor, offering high strength, excellent wear resistance, and superior fatigue resistance. It is designed to meet the high‑speed, high‑torque operating conditions of new‑energy vehicle motors, ensuring stable and reliable power transmission.
- Product Description
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1. Basic Information and Positioning
- Target Audience : New-energy vehicles (pure electric and hybrid models) manufactured by Dongfeng Liuzhou Motor are equipped with vehicle drive motor systems.
- Component Role : The core component of the drive motor—the motor rotor shaft—serves as the critical interface for power transmission. It supports both the rotor core and the permanent magnets while transmitting the motor’s output torque, directly influencing the motor’s power density, efficiency, and reliability. As such, it is a pivotal part ensuring the stable operation of the powertrain in new‑energy vehicles.
- Supply Attributes : A specialized shaft component designed to support Dongfeng Liuzhou Automobile, it matches the installation dimensions, fit tolerances, and performance requirements of the drive motor in its new‑energy vehicle models. It can directly replace the original equipment, ensuring compatibility and consistency with the motor system.
2. Material and Process Characteristics
- Materials ：20CrMnTi Low-carbon alloy carburizing steel is the classic material for new-energy motor shafts.
- Heat treatment process: Employed Carburizing and quenching + low-temperature tempering Treatment: The hardness of critical areas such as journal necks, bearing seats, and mating surfaces can reach HRC58-63 The core maintains high toughness while exhibiting excellent wear resistance, contact fatigue strength, and impact resistance, making it well-suited to the demanding operating conditions of new‑energy vehicle motors—high rotational speeds, frequent start‑stop cycles, and alternating loads.
- Manufacturing Process: The journal and mating surfaces are machined using precision turning, grinding, and dynamic balancing techniques. Dimensional accuracy, coaxiality, and runout tolerances are tightly controlled to ensure high‑precision fits with bearings, the rotor core, and permanent magnets, thereby reducing motor vibration and noise while enhancing operational efficiency and service life.
3. Structural Features (with accompanying diagram)
- Overall structure : The stepped shaft design features multiple sections of varying diameters, including journal and mating sections, to accommodate the installation and positioning of bearings, rotor cores, permanent magnets, end covers, and other components, thereby providing support, precise alignment, and power transmission.
- Functional Segmentation ：
- One end serves as the power output section: it connects to the reducer or gearbox to transmit motor torque, and certain shaft sections feature splines or keyways to ensure reliable high-torque transmission.
- Intermediate mating section: Designed for mounting the rotor core and permanent magnets, the shaft features locating shoulders and keyways to ensure coaxial alignment and secure fixation, thereby preventing displacement during high-speed rotation.
- Bearing journal sections at both ends: designed to mount bearings, support the shaft, and ensure coaxial alignment; their surfaces undergo high-precision grinding to meet the fit requirements of high-speed bearings, thereby reducing friction and wear.
- Some shaft sections are equipped with flanges or shoulder features: these are used to axially locate components, prevent axial movement during high-speed rotation, and enhance the stability of the shaft system.
4. Performance and Application Value
- Core Advantages : The 20CrMnTi material and carburizing‑quenching heat treatment enable this shaft to withstand the demanding operating conditions of new‑energy vehicle motors—high rotational speeds, high torque, and cyclic loading—while resisting deformation, fracture, and wear. Precision machining and dynamic balancing ensure low‑vibration, low‑noise operation, enhancing motor efficiency and the overall vehicle’s powertrain performance.
- Compatible Scenarios The rotor shaft of Dongfeng Liuzhou Automobile’s new‑energy vehicles can also be adapted to the motor shaft components of certain hybrid models, serving as a critical core component for the stable operation of the new‑energy vehicle powertrain.
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