SGR ：Your trusted multi-stage planetary gearbox supplier

In the demanding world of heavy industrial machinery, where reliability, torque density, and operational continuity are non-negotiable, the multi-stage planetary gearbox has emerged as the transmission solution of choice.

Unlike single-stage designs, multi-stage planetary gearboxes deliver ultra-high reduction ratios, exceptional load-carrying capacity, and compact power density—all while maintaining smooth, quiet, and highly efficient operation. These attributes make them indispensable in applications ranging from deep-earth drilling to high-torque material processing.For over 15 years, SGR has stood at the forefront of China’s heavy-duty transmission industry as a leading multi-stage planetary gearbox supplier. Our gearboxes are engineered for the toughest environments and trusted across global markets in trenchless construction, mining, petrochemicals, metallurgy, crane systems, and mud pump operations. Built on rigorous quality standards and deep application expertise, SGR delivers not just components—but mission-critical power solutions.

 What is a multi-stage planetary gearbox?

A multi-stage planetary gearbox integrates two or more planetary gear sets in series within a single housing to achieve high reduction ratios (typically 40:1 to 300:1 or more) without sacrificing efficiency or compactness. Each stage consists of a sun gear, multiple planet gears mounted on a carrier, and an internal ring gear. Power flows through successive stages, multiplying torque while reducing speed incrementally.

Key advantages of a multi-stage planetary gearbox include:

• Multi-tooth load sharing: Torque is distributed across multiple meshing teeth simultaneously, drastically reducing stress on individual components.
• High mechanical efficiency: Even with multiple stages, efficiency remains above 94% per stage due to low sliding friction and precision manufacturing.
• High torsional stiffness and low backlash: Critical for precise motion control in slewing or positioning systems.
• Compact, coaxial design: Saves space and simplifies integration into complex machinery.

At SGR, every multi-stage planetary gearbox is built using 20CrMnTi alloy steel gears, subjected to carburizing, quenching, and precision grinding is high, ensuring durability under extreme cyclic and shock loads.

SGR’s multi-stage planetary gearbox portfolio

SGR offers five core N-type multi-stage planetary gearbox series, each tailored to specific industrial challenges:

Non-Excavation HDD rig gearbox

Designed for horizontal directional drilling rigs, this series of multi-stage planetary gearbox powers thrust-pullback and rotary drive systems with output torque from 2,000 to 80,000 Nm. Its robust design withstands continuous high-load operation in abrasive underground conditions.

Slewing planetary gearbox

Integrated with slewing bearings in construction cranes, wind turbine yaw systems, and port machinery, this series of multi-stage planetary gearbox delivers speed ratios from 40:1 to 300:1 with ultra-low backlash and high rotational accuracy—ensuring safe, stable load handling.

Lead-acid battery plate rolling mill gearbox

Engineered for the precision and consistency required in battery plate production lines, this series of multi-stage planetary gearbox provides 5,500–30,000 Nm of smooth, vibration-free torque to maintain uniform plate thickness and surface quality.

Crusher/Shredder Gearbox

Built for extreme impact environments in mining and recycling, this heavy-duty series of multi-stage planetary gearbox handles peak torques up to 100,000 Nm. Reinforced carriers and oversized bearings absorb sudden load spikes without failure.

Mud Pump Gearbox

Optimized for compatibility with permanent magnet motors in oilfield applications,this series of multi-stage planetary gearbox delivers 4,000–50,000 Nm of continuous torque with excellent thermal stability and sealing performance—even in high-pressure, corrosive slurry environments.

All series feature ductile iron housings for superior rigidity and damping, along with good sealing and integrated lubrication systems for long service life with minimal maintenance.

Besides, the multi-stage planetary gearboxes supplier SGR has its own factory with the area of 15000 square meters, SGR can provide large quantities of production. SGR can also customize multi-stage planetary gearboxes according to your requirements.

Real-world applications of multi-stage planetary gearboxes

SGR’s multi-stage planetary gearboxes are not just engineered—they’re field-proven:

• In horizontal directional drilling projects across Southeast Asia, SGR HDD gearboxes have operated continuously for over 18 months in rocky terrain, achieving zero unplanned downtime.
• A major European crane manufactureradopted SGR slewing gearboxes for its offshore pedestal cranes, citing 30% higher torsional stiffness compared to legacy suppliers—enhancing safety during load rotation in high winds.
• In a Chinese lead-acid battery plant, replacing standard reducers with SGR rolling mill gearboxes reduced plate thickness variation by 40%, directly improving battery cycle life.
• North American shale gas operatorsnow specify SGR mud pump gearboxes paired with permanent magnet drives, benefiting from rapid delivery (4–6 weeks) and seamless integration with modern VFD systems.

Backed by ISO 9001 certification, DNV type approval, and a global after-sales support network, SGR ensures every gearbox performs reliably—from first installation to end-of-life.

As a seasoned multi-stage planetary gearbox supplier, SGR combines 15+ years of heavy-industry insight, precision manufacturing, and application-specific innovation to solve the toughest power transmission challenges. Our gearboxes don’t just meet specifications—they exceed expectations in durability, efficiency, and total cost of ownership.When your operation demands uncompromising performance under extreme conditions, choose SGR—where every tooth, bearing, and housing is engineered for the long haul.（Author, SGR, Angie Zhang）

Email: export@sgr.com.cn

WhatsApp: +86 188 1807 0282

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