Boxin · Hengzhen · Botrust
Precision Manufacturing・Powering the World
Engine input gear
This is an engine input gear shaft supplied as a component for Dongfeng Liuzhou Motor’s new‑energy vehicles. Made from 20CrMnTi alloy carburizing steel, it serves as a critical driving element in the engine–transmission power‑train, offering high strength, excellent wear resistance, and superior fatigue resistance. It is designed to meet the heavy‑load, cyclic operating conditions of hybrid and new‑energy vehicle platforms, ensuring stable and reliable power transmission.
- Product Description
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1. Basic Information and Positioning
- Target Audience : Dongfeng Liuzhou Automobile’s new-energy vehicles (hybrid and plug-in hybrid models) are used in the power‑input stage between the engine and the transmission.
- Component Role The core active component of the drivetrain—the input gear shaft—serves as the engine’s power‑receiving end, transmitting torque to the transmission and the overall drivetrain. It represents the critical starting point of the powertrain and directly influences the vehicle’s transmission efficiency, power response, and operational reliability.
- Supply Attribute : A specialized shaft component designed to support Dongfeng Liuzhou Motor, it matches the installation dimensions, fit tolerances, and performance requirements of its new‑energy vehicle models. It can directly replace the original equipment, ensuring compatibility and consistency with the drivetrain.
2. Material and Process Characteristics
- Materials ：20CrMnTi Low-carbon alloy carburizing steel is a classic material for heavy-duty gear shaft components.
- Heat treatment process: Employed Carburizing and quenching + low-temperature tempering Treatment: The hardness of critical areas such as the gear tooth surface, journal, and bearing seat 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 vehicles—high rotational speeds, high torque, and cyclic loading.
- Manufacturing Process: Precision gear hobbing and grinding, turning, grinding, and dynamic balancing are employed. Gear accuracy can reach Grade 6 or higher, with tight tolerances for journal coaxiality and runout, ensuring high‑precision meshing and fit with bearings and gearbox gears, reducing transmission noise and vibration, and enhancing operational efficiency and service life.
3. Structural Features
- Overall structure : An integrated shaft–gear design that integrates the involute gear section, the journal section, and the mounting hole structure, making it a typical active gear‑shaft component.
- Functional Segmentation ：
- One end features a helical gear section that meshes with the transmission’s driven gear, transmitting engine torque. The gear teeth are precision‑machined for smooth engagement and low noise, enabling efficient power transmission.
- Intermediate journal section: Designed to house bearings, support the shaft, and ensure coaxial alignment; its surface undergoes high-precision grinding to meet the fit requirements of high-speed bearings, thereby reducing friction and wear. The stepped transition design effectively prevents stress concentrations, enhancing fatigue resistance.
- The other end features a connecting hole/keyway structure: it is used to interface with the engine’s output shaft or clutch, receiving engine power and ensuring continuous, stable power transmission.
4. Performance and Application Value
- Core Advantages : The 20CrMnTi material and carburizing‑quenching process enable this shaft to withstand cyclic loads, impact loads, and torsional stresses under the hybrid operating conditions of new‑energy vehicles, minimizing deformation, fracture, and wear. Precision gear machining and dynamic balancing ensure low‑vibration, low‑noise operation of the transmission system, thereby enhancing transmission efficiency and the vehicle’s overall power performance.
- Compatible Scenarios The engine input gear shaft and transmission input shaft for Dongfeng Liuzhou Motor’s hybrid and plug-in hybrid models, as well as the motor input gear shaft used in certain all-electric vehicles, are critical core components that ensure the stable operation of the vehicle’s powertrain.
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