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Date：
2025-06-30
Provide solutions for high-end agricultural machinery core gear transmission devices such as high-power combine harvesters
Gearbox industry: With a scale of over 100 billion yuan in China, it is widely used in downstream industries and faces fierce market competition.
In response to the demand for core gear transmission devices in high-end agricultural machinery such as high-power combine harvesters, combined with industry technology trends and practical application cases, the following systematic solutions are provided.
Design and Material Technology of High Performance Gearbox
1. Structural optimization of high torque gearbox
Multi stage planetary gear transmission: Adopting a composite transmission structure combining planetary gear sets and parallel shaft gears, such as the gearbox design in X technology patent, it can withstand a maximum input torque of 1670N · m and is suitable for 30-40 ton combine harvesters. By utilizing the power splitting characteristics of planetary gears, the transmission efficiency is improved (>95%) and vibration and noise are reduced.
Hydraulic power shifting system: Drawing on the 8-stage power shifting technology of Case New Holland, it adopts a wet clutch and hydraulic damping track design to achieve uninterrupted power shifting with a shifting time of less than 400ms. At the same time, pressure fluctuations are controlled within ± 0.2MPa through a three-stage hydraulic damping structure, significantly improving smoothness.
2. Breakthrough in Materials and Coating Technology
Application of Ultra Pure Gear Steel: High temperature carburizing gear steel (such as sulfur-containing and aluminum containing non calcium treated steel) developed by Nangang is used. Through narrow hardenability control technology, mixed crystals are avoided under 1000 ℃ carburizing conditions, and contact fatigue strength is increased by 30%. It can replace imported materials.
Wear resistant coating strengthening: tungsten carbide thermal spraying technology (porosity<3%) is used on the gear tooth surface, with a surface hardness of HV1200 or above, and the wear resistance life is extended by 2-3 times; Alternatively, MoS ₂/C composite multilayer coating can be used, with a wear rate as low as 4.5 × 10 ⁻¹⁶ m ³/N · m under high load of 80N, suitable for high dust field environments.
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