1. Basic Information and Positioning

• Target Audience : Dongfeng Liuzhou Automobile’s new-energy vehicles (pure electric and hybrid models) are equipped with a transmission secondary shaft drive system.
• Component Role The core driven gear component of the transmission’s countershaft meshes with the driving gear to transmit torque and convert rotational speed. It is a critical part for power splitting and speed reduction with torque multiplication in the transmission, directly impacting the vehicle’s transmission efficiency and dynamic response.
• Supply Attribute : Specialized gear components supplied to Dongfeng Liuzhou Motor, designed to meet the mounting dimensions, fit tolerances, and performance requirements of its new‑energy vehicle transmissions. These parts can directly replace original equipment, ensuring optimal compatibility and consistency within the drivetrain.

2. Material and Process Characteristics

• Materials ：20CrMnTi Low-carbon alloy carburizing steel is a classic material for heavy-duty gear components.

3. Structural Features

• Overall structure : A disc-shaped external gear with an outer ring featuring uniformly distributed involute teeth and an inner ring equipped with a splined bore and mounting flange, representing a typical secondary-shaft driven gear configuration.
• Tooth Design The external teeth are involute cylindrical gear profiles that mesh with the transmission’s driving gear to transmit power. The tooth geometry parameters are directly matched to the transmission’s gear ratio and load-carrying capacity, ensuring reliable high-torque transmission.
• Installation Structure The inner ring features a splined bore designed to engage with the transmission’s countershaft and transmit torque. The flange surface is equipped with multiple evenly spaced bolt holes for secure attachment to the countershaft or other components. Precision‑machined, the flange ensures coaxial alignment with the countershaft, thereby preventing vibration and axial movement during high‑speed operation.

4. Performance and Application Value

• Core Advantages : The 20CrMnTi material and carburizing‑quenching process enable this gear to withstand the high torque, cyclic loads, and impact forces typical of new‑energy vehicle transmissions, while resisting wear, pitting, and fracture. Precision‑machined tooth profiles and mounting surfaces ensure low noise and high‑efficiency operation, enhancing ride smoothness and powertrain performance.
• Compatible Scenarios The secondary shaft assembly for Dongfeng Liuzhou Automobile’s new‑energy vehicle transmissions can also be adapted to the transmission components of certain hybrid models, serving as a critical core component that ensures the stable operation of the vehicle’s power‑train system.