Knowledge about high-torque planetary gearbox and SGR’s high-torque planetary gearbox

Planetary gear reducers are the "all-round players" in the industrial world. They transmit power through the meshing of planetary gears, have high transmission efficiency, long life and simple maintenance.

For planetary gear reducers, torque is the core indicator to measure their transmission capacity and load-bearing performance. It directly determines whether the reducer can effectively drive the load, cope with shock conditions and ensure long-term stable operation of the equipment. In the industrial field and mechanical equipment, we often hear "the equipment cannot start" and "the equipment cannot be driven".

In fact, these are manifestations of insufficient torque of the planetary gear reducer. At this time, high-torque planetary gear reducers can be of great use. So, what are the main application scenarios of high-torque planetary gear reducers?

(1) Sugarcane pressing equipment

In the sugar industry, the sugarcane pressing unit is the key link in extracting sugarcane juice. This equipment is continuously fed, has large load fluctuations, and the raw material contains high fiber content, which is prone to instantaneous overload. In addition, the working environment is high temperature, high humidity and highly corrosive. In the sugarcane pressing machine, the assistance of high-torque planetary gear reducers is indispensable. As the main drive of the squeezing roller, the high-torque planetary gear reducer can provide a smooth, continuous, high-torque output, effectively coping with impact conditions such as sugarcane block jamming and fiber winding. For example, the N series high-torque planetary gear reducer of Hezong Heavy Industry adopts 20CrMnTi carburized and quenched + precision ground gears, with high surface hardness and strong corrosion resistance. Combined with the forced lubrication system and a torque of 2000-8000 Nm, it ensures that the sugarcane squeezing equipment can operate stably for a long time in a harsh environment with humidity and sugar splashing, significantly reducing maintenance frequency and downtime.

(2) Roller press In cement, mining, metallurgy and other industries

Roller presses are widely used in the pre-grinding and final grinding systems of materials, squeezing and crushing the materials through two high-pressure rollers. The roller press requires the planetary gear reducer to have an extremely high output torque to generate sufficient roller pressure. It also requires the planetary gear reducer to withstand strong vibration and periodic impact loads and have a stable transmission capacity to avoid roller gap offset or equipment damage due to torque fluctuations. For example, Hezong Heavy Industry's high-torque planetary gear reducer, as the main transmission device of the roller press, can efficiently convert the speed of the high-speed motor into low-speed high-torque output, driving the roller shaft to operate stably. At the same time, the high mechanical efficiency (≥96%) of the high-torque planetary gear reducer can significantly reduce the system energy consumption, helping enterprises achieve energy conservation and consumption reduction goals.

(3) Mining crushing and conveying equipment

In large open-pit mines and underground mining operations, jaw crushers, cone crushers, scraper conveyors, belt conveyors and other equipment operate for a long time under high dust, heavy loads, and frequent start-stop conditions, which puts extremely high demands on the load capacity and reliability of the reducer.

Therefore, high-torque planetary gear reducers are also widely used in the main drive of crushers, providing high starting torque to overcome material blockage and instantaneous overload; for long-distance conveyor drives: to achieve multi-point synchronous drive and ensure uniform belt tension; for transfer machines and hoists: to ensure smooth start-stop of heavy loads and prevent "reversal" or "slipping".

It's worth noting that Hezong Heavy Industry's high-torque planetary gear reducers, thanks to their high-strength alloy steel materials, optimized heat treatment processes, and full-power testing, have been widely used in numerous large-scale coal and iron ore mining projects, becoming a trusted transmission solution for mining customers.

Of course, high-torque planetary gear reducers are also used in rolling mills, continuous casting machines, blast furnace charging systems, tower cranes, gantry cranes, winches, and other equipment.

(4)Features of SGR’s high torque planetary gearbox

As a leading manufacturer of high-torque transmission solutions, SGR has engineered its N-series high-torque planetary gearboxes to meet the most demanding industrial requirements. These gearboxes are not merely mechanical components—they are precision-engineered power transmission systems designed for maximum reliability, efficiency, and longevity in the harshest operating environments.

Exceptional torque density and high Load capacity

SGR’s planetary gearboxes utilize a multi-stage planetary configuration with optimized gear geometry and load distribution. This design enables the transmission of output torques ranging from 2,000 Nm to over 500,000 Nm, depending on the model and application. The use of multiple planet gears per stage ensures effective load sharing, minimizing stress concentration and significantly enhancing fatigue resistance. This makes SGR gearboxes ideal for applications involving heavy shock loads, such as mining crushers and cement roller presses.

Precision manufacturing with 20CrMnTi alloy steel

All critical gear components—including sun gears, planet gears, and ring gears—are forged from high-purity 20CrMnTi alloy steel. This material is selected for its excellent hardenability, toughness, and wear resistance. The gears undergo carburizing and quenching heat treatment, achieving a surface hardness of HRC 58–62 while maintaining a ductile core to absorb impact energy.

High mechanical efficiency and energy savings

SGR’s planetary gearboxes achieve single-stage efficiency of ≥97% and overall efficiency of ≥94% in multi-stage configurations. This high efficiency translates into lower energy consumption and reduced heat generation—critical advantages in enclosed or high-temperature environments like sugarcane mills or underground mines. The optimized gear meshing and low-friction bearings further contribute to long-term operational economy.

Robust design for harsh industrial environments

Housed in high-strength cast iron or welded steel casings, SGR gearboxes are built to withstand vibration, dust, moisture, and thermal cycling. Optional features include forced lubrication systems, oil cooling circuits, and integrated condition monitoring sensors (temperature, vibration, oil level).

Advanced R&D and quality assurance

Backed by a PhD-led R&D team, SGR employs proprietary design software for dynamic load simulation and thermal analysis. Every gearbox is validated on a full-power performance test bench, simulating real-world load, speed, and thermal conditions. Quality control is reinforced with CNC coordinate measuring machines (CMM) and 100% final inspection, ensuring every unit meets stringent reliability standards.

In summary, SGR’s high-torque planetary gearboxes deliver superior power density, durability, and efficiency, making them the preferred choice for mission-critical industrial applications where downtime is not an option.(Author,SGR, Angie Zhang)

Email: export@sgr.com.cn

WhatsApp: +86 188 1807 0282

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