PLH Series Planetary Reducer: Helical Hard Tooth Surface & Low Backlash Precision Solution
I. Product Overview
Weigao PLH Series Planetary Reducers, covering models PLH60, PLH90, PLH120, PLH160, and PLH200, are high-precision transmission devices integrating helical hard tooth surface planetary gear trains and multi-installation mode design. Tailored for scenarios demanding low backlash, stable operation, and flexible layout such as automated production lines, precision machine tools, and intelligent handling equipment, this series overcomes the shortcomings of traditional reducers such as large backlash, single installation form, and poor compatibility in precision transmission fields. Compliant with ISO 6336 gear standards and ISO 9001 certification, with IP65 protection grade, it features integral helical gear sets, high-strength aluminum alloy (small models) and cast iron (large models) housing, and optimized backlash adjustment structure. Boasting advantages of low backlash precision, multi-installation adaptation, smooth helical transmission, and wide torque coverage, it operates stably at -20℃ to +95℃, serving as a core component for precision industrial equipment worldwide.
II. Core Advantages
1. Hard Tooth Surface Planetary Structure, High Torque Density
Adopting integrated helical hard tooth surface planetary structure, the PLH series achieves superior precision transmission through meshing of integral forged sun gears, planetary gears, and inner gear rings. Gears are crafted from 20CrMnTi alloy steel, undergoing deep carburizing, quenching, and precision grinding to ISO 5-level accuracy (GB/T 10095.1-2008 equivalent), with tooth surface hardness up to HRC 62-64 and roughness ≤Ra 0.03μm. Detailed precision parameters: sun/planet gear tooth profile tolerance (f) ≤0.008mm, tooth direction tolerance (f) ≤0.006mm, cumulative pitch error (F) ≤0.020mm; inner gear ring ISO 6-level accuracy, with f ≤0.012mm. Helical gear design enhances meshing重合度 by 40% versus straight teeth, reducing noise and ensuring smooth transmission. Equipped with pre-tightened bearing structure, backlash is controlled within ≤3arcmin (precision grade optional ≤1arcmin), torque density reaches 16Nm/cm³, single-stage efficiency hits 97%-99%, speed ratio 3:1-100:1 (multi-stage extendable to 3000:1), fully meeting precision transmission demands.
2. Shaft-Mounted Direct-Drive Design, Compact Installation
The series features multi-installation mode compatibility, supporting B3底脚安装, B5/B14 flange installation, and hollow shaft with flat key connection, adapting to horizontal, vertical, and inclined spatial layouts without additional adapters. PLH60-PLH200 form a complete matrix: PLH60-PLH120 (aluminum alloy housing) cover 0.5kW-45kW power and 300Nm-5000Nm torque for light-medium precision load; PLH160-PLH200 (cast iron housing) cover 55kW-120kW power and 6000Nm-25000Nm torque for heavy-duty precision scenarios. Housing structure optimized via finite element simulation enhances rigidity and shock absorption, with reinforced ribs reducing deformation under 1.2 times rated load. Equipped with adjustable torque arm and anti-vibration gaskets, it minimizes installation deviation and ensures coaxiality accuracy ≤0.02mm, perfectly matching precision equipment's installation requirements.
3. Enhanced Sealing Protection, Harsh Environment Adaptation
Integrated precision protection design ensures stable operation in precision industrial environments. Input/output ends adopt double-lip fluorine rubber oil seals combined with labyrinth sealing, achieving IP65 protection to prevent dust and light oil intrusion. Small models (PLH60-PLH120) adopt anodized anti-corrosion treatment, large models (PLH160-PLH200) electrophoretic treatment (C3 grade), adapting to indoor precision workshops and general industrial environments. Integrated cooling fins and optimized oil circuit design enhance heat dissipation efficiency by 20%, avoiding overheating during long-term high-speed operation. High-precision tapered roller bearings reduce radial runout to ≤0.01mm, operating noise ≤55dB at 1m, ensuring no interference to precision equipment operation, service life extended to over 35000 hours under normal conditions.
4. Extreme Pressure Lubrication, Low Maintenance Cost
The lubrication system adopts ISO VG 150 precision gear oil, featuring low viscosity, excellent anti-wear, and anti-oxidation performance, matching low backlash transmission to reduce friction resistance. Oil bath lubrication with splash optimization ensures uniform oil supply to meshing parts, forming a stable oil film. The housing is equipped with a high-precision oil level sensor, visual oil level window, and quick oil change port, facilitating real-time monitoring and maintenance. Recommended oil change cycle: 15000 hours for continuous operation, 8000 hours for high-frequency precision scenarios. Modular design allows quick disassembly of gear sets and bearings, with standardized precision accessories reducing maintenance difficulty and ensuring backlash accuracy after overhaul.
III. Typical Application Fields
- Precision Machine Tools: CNC machining centers, precision lathe feeding mechanisms, low backlash ensuring processing accuracy (PLH60-PLH120 for small machines, PLH160-PLH200 for large gantry machines)
- Automated Production: Intelligent assembly lines, robotic arm transmission systems, multi-installation mode adapting to layout and low noise meeting workshop requirements
- Intelligent Handling: AGV/AMR drive systems, precision stacking equipment, compact structure and low backlash ensuring positioning accuracy
- Electronic Manufacturing: Semiconductor equipment, component precision testing machines, ultra-low backlash matching micron-level operation needs
- Packaging Machinery: High-speed precision packaging lines, printing equipment, smooth helical transmission ensuring stable material conveying and processing quality
IV. Key Technical Parameters
| Model | Installation Mode | Rated Torque | Backlash | Housing Material |
|---|
| PLH60 | B3/B5, Hollow Shaft (Flat Key) | 300Nm-800Nm | ≤3arcmin (Optional ≤1arcmin) | Aluminum Alloy |
| PLH90 | B3/B5/B14, Hollow Shaft (Flat Key) | 900Nm-2000Nm | ≤3arcmin (Optional ≤1arcmin) | Aluminum Alloy |
| PLH120 | B3/B5/B14, Hollow Shaft (Flat Key) | 2200Nm-5000Nm | ≤3arcmin (Optional ≤1.5arcmin) | Aluminum Alloy |
| PLH160 | B3/B5/B14, Hollow Shaft (Flat Key) | 6000Nm-15000Nm | ≤5arcmin (Optional ≤2arcmin) | Cast Iron |
| PLH200 | B3/B5/B14, Hollow Shaft (Flat Key) | 16000Nm-25000Nm | ≤5arcmin (Optional ≤2arcmin) | Cast Iron |
V. Installation & Maintenance
Select models based on rated torque, transmission ratio, installation space, and backlash requirements (refer to the specification table). Ensure coaxiality error ≤0.02mm during installation, fasten bolts with specified torque (30-60N·m for PLH60-PLH90, 70-120N·m for PLH120-PLH200) in diagonal sequence, and install anti-vibration gaskets for precision equipment. Use ISO VG 150 precision gear oil, replace every 8000-15000 hours based on operating frequency. Regularly inspect sealing performance, backlash value (calibrate every 6 months), and oil quality. Avoid impact load operation, and entrust maintenance to professional technicians to ensure precision after overhaul.
Weigao PLH Series adheres to the philosophy of "precision transmission, flexible adaptation, and stable durability". Its helical hard tooth surface and low backlash design break through traditional reducers' precision limitations, ensuring reliable operation in high-precision industrial scenarios. Backed by strict quality control and professional after-sales service, it provides high-performance solutions for machine tools, automation, and electronic manufacturing, establishing itself as a trusted global partner in precision planetary transmission.
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