I. Core Perforce Parameters (Typical Values)

• Transmission Ratio: Usually in the range of 3.0–6.5 (e.g., 3.3–6.1 for heavy-duty trucks), realizing "speed reduction and torque increase" to adapt to climbing, acceleration and medium-high speed cruising.
• Torque Bearing Capacity: 1,300–2,200 N·m (for heavy-duty gearboxes), meeting the requirements of heavy-load starting and continuous climbing.
• Material & Process: 20CrMnTi/20MnCr5 carburized alloy steel, treated by carburizing and quenching + gear tooth precision grinding, with gear tooth hardness ofHRC 58–62 and strong core toughness.
• Precision Grade: ISO 5–6, with small tooth direction/tooth profile error, stable meshing and low noise.
• Lubrication Adaptation: Suitable for pressure lubrication (2–4 Bar), with strong heat dissipation and anti-wear capabilities under high-speed and heavy-load conditions.

II. Core Product Advantages

1. Power Transmission: Efficient, Stable and Impact-Resistant

• High Transmission Efficiency: Single-stage gear meshing, mechanical loss ≤ 2%, more energy-saving than multi-gear series transmission, and lower fuel consumption under medium-high speed conditions.
• Reasonable Torque Distribution: As the core gear of the intermediate shaft, it evenly distributes the load, reduces the fatigue of the shafting and bearings, and improves the overall service life.
• Strong Impact Resistance: Carburized layer depth is 0.8–1.2 mm, with optimized tooth root fillet, which can withstand frequent gear shifting and road impact, and is not easy to tooth breakage or pitting.

2. Structure & Adaptability: Compact, Reliable and Easy to Maintain

• Compact Structure: Integrated with the intermediate shaft or spline-fastened design, small axial size, adapting to the miniaturization needs of the gearbox.
• Strong Compatibility: Suitable for three-shaft/twin-intermediate-shaft gearboxes (e.g., 10/12-speed gearboxes for heavy-duty trucks), compatible with 240–380 HP engines, covering highway, engineering and special vehicle scenarios.
• Low Maintenance Cost: Modular design, can be replaced separately without disassembling the entire gearbox, reducing after-sales working hours and costs.

3. Operation Quality: Smooth, Low-Noise and Long-Lasting

• Smooth Gear Shifting: Gear profile modification + high-precision ufacturing, combined with synchronizer, speed difference controlled within ±50 rpm, no tooth striking and small impact.
• Low Noise: Helical gear meshing (contact ratio ≥ 1.4), stable operation, and noise is 5–8 dB(A) lower than that of spur gears.
• Long Service Life: Fatigue strength ≥ 450 MPa, design service life ≥ 500,000 km under normal working conditions, reducing replacement frequency.