China helical pinion shaft factory and manufacturers

Helical Pinion Shaft used in Helical Gearbox Featured Image

Short Description:

The helical pinion shaft is the core power transmission component in high-performance helical gearboxes. With a precision-engineered length of 354mm, our pinion shafts are designed to bridge the gap between high-speed motor inputs and heavy-duty torque outputs, ensuring smooth, quiet, and efficient energy transfer.

Material: 18CrNiMo7-6

Heat Treat: Carburizing plus Tempering

Hardness: 56-60HRC at surface

Core hardness: 30-45HRC

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The helical pinion shaft is the critical high-speed input component within a helical gearbox, responsible for transmitting torque while ensuring smooth, quiet operation. At Belon Gear, we specialize in engineering pinion shafts that balance extreme surface hardness with core toughness, specifically designed to withstand the axial and radial loads typical of heavy-duty industrial reducers.

Leveraging our position as one of China’s top ten gear enterprises, we provide vertically integrated manufacturing—from raw material forging to final tooth grinding—ensuring that every shaft, such as our 354mm long series, meets the highest standards of the global power transmission industry.

Processing a 354mm helical pinion shaft requires specialized equipment to maintain concentricity and pitch accuracy over a long span.

CNC Hobbing & Grinding: We utilize high-speed CNC hobbing for initial tooth formation, followed by precision grinding to achieve ISO 6 or ISO 7 accuracy grades.
Micro-Geometry Modification: To compensate for potential shaft deflection in 354mm applications, our engineers apply tooth crowning and lead modification. This ensures an optimal contact pattern under load, reducing NVH (Noise, Vibration, and Harshness).

Production Process:

At Belon Gear, we follow a rigorous 6-stage manufacturing protocol to ensure our spline shafts meet the high-torque and wear-resistance requirements of automotive and industrial applications. Utilizing 8620 alloy steel, known for its excellent carburizing properties, we transform raw material into high-precision transmission components.

1. Precision Forging: From 8620 Ingot to Bar Stock

The process begins with the controlled forging of 8620 raw material. Unlike simple casting, our forging process refines the internal grain structure of the steel, aligning it with the shaft's geometry.

2. Pre-Heat Treatment (Normalizing or Quenching)

Before machining, the forged bars undergo a specialized pre-heat treatment—typically Normalizing or Quenching & Tempering.

3. CNC Lathe Turning: Establishing Rough Dimensions

Using high-speed CNC lathes, the forged bar is turned to its rough dimensions.

4. Spline Hobbing: High-Efficiency Tooth Cutting (If you want to know more about this procedure, click to watch the video: https://youtube.com/shorts/80o4spaWRUk)

This is the core stage where the mechanical interface is formed. We utilize advanced Hobbing Machines to cut the spline profile (Involute, Parallel, or Serrated).

5. Carburizing Heat Treatment: The "Hard Shell, Tough Core"

8620 is a premier carburizing steel. We subject the hobbed shafts to a controlled carbon-rich atmosphere at high temperatures.

6. Rigorous Testing & Metrology

No shaft leaves Belon Gear without passing our "Digital Audit."

Dimensional & Spline Accuracy: Verified via Brown & Sharpe CMM and Klingelnberg P-series measurement centers.

Metallurgical Integrity: We perform hardness profile testing and grain analysis to ensure the carburizing depth meets your exact specifications.

Surface Finish: Japanese roughness testers confirm the Ra values meet the low-friction requirements of high-speed rotation.

Manufacturing Plant :

As one of top-ten enterprises in the gear manufacturing industry in china, with 1200 specialists, Belon has achieved total 31 inventions and 9 patents. Belon has professional manufacturing equipment, heat treat equipment, and inspection equipment.

All processes starting from raw material to finished product are finished in house, and the strong engineering team and quality team aim to meet and beyond customer’s requirement.