Fixed High And Low Gears

These Fixed High and Low Gears remain in constant mesh. They are used in auxiliary gearboxes or two-speed reduction systems. Gear changes occur by moving a sliding gear or clutch sleeve. Yancheng Botu Transmission Machinery manufactures these gears from 20CrMnTi steel. We carburize and quench them, then grind them to precise specifications. The tooth shape achieves DIN 7 grade accuracy, ensuring smooth high and low range shifts and efficient power transfer. Quality Fixed High and Low Gears make range shifting effortless.

We use precision gear grinding to achieve DIN 7 tooth shape accuracy. The carburized layer is 0.8–1.2 mm deep, with a surface hardness of HRC58–62. This gives the gears excellent wear resistance, even under long-term use. Tooth root radii are optimized to reduce stress, improving fatigue life. These Fixed High and Low Gears are engineered for the toughest range-shifting demands.

With 8 years of experience producing transmission components, we understand that constant-mesh gears face wear as the main challenge. We optimize case depth and tooth surface finish to extend gear life by 30% or more. Full CNC equipment-including CNC gear hobbing and grinding machines-is used to ensure accuracy. Machines are regularly calibrated. Orders start at 50 pieces. OEM and custom work is supported: you can provide a CAD drawing or sample, with custom samples taking about 60 days.