SunUs / Sunus Drive — Precision Planetary Gearboxes for Servo Systems
Global sourcing of precision planetary gear reducers manufactured by SunUs Tech Co., Ltd. (Taiwan). Featuring PG universal, AG economic, UM high-torque, DG compact, and DMU backlash-free planetary drives for CNC machine tools through SpareX.
Universal Precision Planetary Gearboxes PG Series
SunUs PG series planetary reducers are engineered for CNC servo drives and feed axes. The housing and internal ring gear form a rigid single-piece alloy steel structure. Precision ground nickel-chromium-molybdenum alloy gears undergo deep carburizing and surface hardening.
- One-piece alloy steel housing with integrated precision internal ring gear
- Nickel-chromium-molybdenum alloy gears with deep carburizing treatment
- Filled with premium German synthetic gear oil requiring no scheduled changes
- Modular input bushings and adaptable mounting flanges for any servo motor
Economic Precision Planetary Reducers AG Series
The SunUs AG series delivers high output torque and smooth operation within constrained spaces. Single-stage backlash ranges from under 1 to 5 arcmin, while two-stage units achieve 3 to 7 arcmin. Transmission efficiency reaches 97% with minimal thermal dissipation.
- Single-stage backlash under 1 to 5 arcmin for precise motion profiles
- High mechanical transmission efficiency reaching 97% in single-stage models
- Compact space-saving envelope engineered for high operational torque
- Wear-resistant heat-tolerant oil seals maintaining dependable airtightness
Heavy-Duty High-Torque Planetary Gearboxes UM Series
SunUs UM series gearboxes are engineered for heavy gantry milling machines and horizontal boring mills. Heavy-duty taper roller bearings on the output shaft support massive axial and radial forces. An enlarged mounting flange guarantees maximum torsional rigidity under peak torque loads.
- Heavy-duty taper roller bearings supporting extreme axial and radial thrust
- Enlarged flange architecture delivering high torsional rigidity on heavy mills
- Reduced backlash option reaching 1 to 2 arcmin for precision gantry axes
- Output options including solid keyed shaft, hollow bore, and splined design
Compact Plate-Design Planetary Reducers DG Series
The SunUs DG series features a shorter axial housing profile tailored for tight machine compartments. Precision ground gearing keeps rotational backlash under 1 arcmin for sensitive feed mechanisms. The architecture suits tube benders, automated packaging units, and textile machines.
- Shortened axial profile designed for narrow machinery installation envelopes
- High gear mesh precision maintaining backlash at 1 arcmin or below
- Carburized and ground gear geometry minimizing operating noise and vibration
- Direct flange mounting interface eliminating bulky intermediate adaptors
Mechanical Backlash-Free Planetary Gearboxes DMU Series
SunUs DMU series reducers incorporate a mechanical preloading mechanism driven by a single servo motor. The design eliminates clearances within the gear train and between the drive pinion and rack. This avoids dual-motor electrical preload configurations while stabilizing tool paths.
- Mechanical preload system driven by a single motor eliminating gear clearance
- Complete backlash elimination across pinion-and-rack drive interfaces
- Sustained preloading force maintained throughout long operating lifespans
- Significant cost savings by replacing twin-motor electronic preload setups
Hollow-Shaft Precision Planetary Reducers HG Series
The HG series planetary reducers feature a through-hole hollow output shaft architecture. Electrical power cabling, laser optical paths, and pneumatic lines route directly through the center bore. The configuration suits indexing rotary tables, robotic joints, and semiconductor machinery.
- Through-hole hollow output bore accommodating utility cables and hoses
- High torsional rigidity suited for dynamic reversing rotary indexing cycles
- Tight dust-excluding seals protecting inner components from external debris
- Standardized mounting interface for direct indexing table integration
Precision Planetary Gearbox Portfolio of SunUs
Taiwanese manufacturer SunUs Tech Co., Ltd. (SunUs / Sunus Drive) possesses over 60 years of gear engineering background and more than two decades of dedicated planetary reducer development.
The product line delivers high torsional stiffness, smooth velocity profiles, and minimal backlash for CNC machine tools and robotics.
The product ecosystem spans universal PG units with integral ring gears, economical AG series with backlash under 1 arcmin, heavy-duty UM reducers for massive gantry mills, short-profile DG models, mechanical backlash-free DMU units, and hollow-shaft HG rotary platforms.
Engineering Selection and Servo Motor Matching Criteria
Selecting an optimal SunUs planetary reducer requires aligning continuous and acceleration torque profiles, reduction ratios, allowable radial thrust, and required positioning precision across machine feed axes.
For dynamic gantry drives and precision automation joints, backlash-free DMU and compact DG platforms deliver rigid motion transfer. SpareX provides engineering review of motor mounting adaptors for Fanuc, Siemens, Yaskawa, and Mitsubishi drives, ensuring seamless drive integration.
SunUs and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of SunUs and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.
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Documents and sources
- Official SunUs catalog — precision planetary gearboxes for servo drives
- Universal PG series planetary reducers — specifications and one-piece housing
- Economic AG series — compact planetary gearboxes with low backlash ratings
- Heavy-duty UM series — taper roller bearings and high output torque capacity
- Compact DG series — short axial profile and precision flange mounting
- Backlash-free DMU series — mechanical preloading for pinion and rack drives
- SunUs manufacturing heritage — over 60 years of gear engineering expertise
- Chinese factory portal of SunUs — Jing Jie Precision Machinery profile
