In the rapidly evolving automotive landscape, the Transmission Spline Shaft serves as the critical link between the electric motor and the gearbox. At Belon Gear, we engineer spline shafts designed to withstand the high-torque, high-RPM environments characteristic of modern Electric Vehicles (EV) and Hybrid Electric Vehicles (HEV).

1. Advanced Metallurgy for High-Torque Durability

The integrity of an automotive motor depends on the fatigue resistance of its drivetrain components. We utilize premium alloy steels specifically chosen for their balance of core toughness and surface hardness.

• Material Selection: Standard options include 42CrMo, 20CrMnTi, and 8620H alloy steels. These materials are sourced from certified suppliers to ensure consistent chemical composition and grain structure.
• High Power Density: Our shafts are engineered to handle the instantaneous torque of electric motors, preventing spline shear or deformation during rapid acceleration.

2. Precision Spline Geometry & Custom Profiles

The interface between the motor and the transmission requires uncompromising accuracy to minimize NVH (Noise, Vibration, and Harshness).

• Custom Spline Profiles: We specialize in producing Involute Splines, Parallel Side Splines, and Serrated Splines tailored to your specific coupling requirements.
• Precision Standards: Operating at ISO 6 to ISO 8 accuracy levels, our shafts ensure a perfect fit with mating gears, reducing backlash and extending the lifespan of the entire drivetrain.
• Micro-Module Expertise: With capabilities ranging from M0.3 to M1.5 and beyond, we support compact motor designs that prioritize space and weight savings.

3. Specialized Heat Treatment for Wear Resistance

To thrive in high-speed automotive applications, a spline shaft must have a "hard shell" and a "resilient heart."

• Optimized Hardness: Through in-house Quenching & Tempering and Induction Hardening, we achieve precise surface hardness (typically 28-32 HRC or higher depending on specs) while maintaining the ductility needed to absorb shock loads.
• Distortion Control: Our advanced heat treatment processes are monitored in real-time to minimize thermal distortion, reducing the need for excessive post-treatment machining and preserving the material's structural integrity.