What Is a Planetary Cycloid Reducer?
A Planetary Cycloid Reducer or a Planetary Cycloidal Pinwheel Reducer is an advanced mechanical transmission system that combines the accuracy of planetary gears and the load efficiency of the cycloidal mechanism. This hybrid gearbox gives exceptional torque density, small size, and great dependability which makes it perfect for the robots, CNC machinery, automation, and even the most precise industrial equipment. At Senotay (Hebei OuTai Environmental Protection Equipment Co., Ltd.), our Planetary Cycloid Reducers are made using the latest technology to deliver 40% higher torque density and <1 arcmin backlash which in turn means smooth, steady, and efficient motion control across critical applications.
Why Choose the Senotay Planetary Cycloid Reducer?
When you choose a Senotay Cycloidal Reducer, you don’t just get an innovative product but also the best engineering, durability, and technology. Besides, here are the reasons why industries trust our Planetary Cycloid Gearbox solutions:
Hybrid Technology Advantage – Fuses a planetary input stage (98.5% efficiency) with a cycloidal output stage (18-point contact) for the strongest torque transmission.
Space-Efficient Design – Up to 30% less space is required compared with traditional reducers in the same torque class.
Ultra-Precision Performance – Guarantees ≤1 arcmin backlash and also provides optional configurations for high-precision.
Long Lifespan & Reliability – 3× nominal load testing and 80,000 operational hours rating..
Smart Monitoring – Comes with IoT-ready vibration and thermal monitoring ports for predictive industrial maintenance..
Certified Quality – Compliant with ISO 9001:2015, AGMA, ATEX, and DNV GL Marine standards.
Product Description, Material & Mechanical Properties
The Senotay Planetary Cycloid Reducer features a hybrid three-stage reduction system that integrates planetary and cycloidal motion principles.
Constructed with high‑strength, precision‑ground materials, every component undergoes stringent quality control to ensure optimal efficiency and durability.
Component | Material & Treatment | Properties | Standard |
Main Body | EN‑GJS‑700‑2 Ductile Iron | High tensile strength, vibration damping | ASTM E802 |
Cover | A356‑T6 Aluminum Alloy | Lightweight, corrosion-resistant | ISO 2768‑fH |
Sun Gear | 20MnCr5 (case‑hardened) | Surface HRC 62±1, Core HRC 38±2 | ISO 1328‑1 Grade 5 |
Planet Gears | 18CrNiMo7‑6 (nitrided) | Superior wear and fatigue resistance | DIN 3967 Class 5 |
Cycloidal Discs | SV30 Steel (vacuum‑treated) | Exceptional load endurance | ISO 6336:2021 |
Bearings | Cross Roller (preloaded) | Zero axial play | ISO 10816‑3 Class A+ |
Sealing System | Magnetic Fluid Seal + Gas Purge Labyrinth | IP68 • Optional IP69K | MIL‑STD‑810H |
Planetary Cycloid Reducer – Model and Specification Table
Model Type | Reduction Ratio (1: ) | Input Power (kW) | Output Torque (Nm) | Backlash (arcmin) | Efficiency (%) | Weight (kg) |
PCR‑XT‑25‑60 | 25 | 0.75 | 500 | ≤ 1 | 96 | 18 |
PCR‑XT‑40‑75 | 40 | 1.5 | 800 | ≤ 1 | 95 | 25 |
PCR‑XT‑87‑100 | 87 | 3.0 | 1,800 | ≤ 1 (optional 0.3) | 95 | 42 |
PCR‑XT‑128‑125 | 128 | 5.5 | 3,200 | ≤ 2 | 94 | 65 |
PCR‑XT‑192‑140 | 192 | 7.5 | 5,000 | ≤ 2 | 95 | 95 |
PCR‑XT‑256‑160 | 256 | 11 | 8,000 | ≤ 3 | 94 | 150 |
PCR‑XT‑320‑180 | 320 | 15 | 12,500 | ≤ 3 | 94 | 210 |
PCR‑XT‑384‑200 | 384 | 22 | 20,000 | ≤ 3 | 95 | 315 |
PCR‑XT‑448‑210 | 448 | 30 | 32,000 | ≤ 3 | 95 | 480 |
PCR‑XT‑512‑220 | 512 | 55 | 65,000 | ≤ 3 | 94 | 720 |
(All models tested per ISO 6336 and AGMA 6123-D20 standards.)
Planetary Cycloid Reducer — Technical Specification Table
Physical Dimensions | Performance Ratings | Material & Construction | Operational Data | Certifications & Lifecycle |
Model Range: PCR-40 to PCR-350 | Reduction Ratio: 10:1 – 200:1 | QT600-3 Ductile Cast Iron / Al-Alloy (≤PCR-110) | 3,000 rpm | ≥ 40,000 h |
Overall Length: 120–680 mm | Rated Output Torque: 120–18,000 Nm | 20CrMnTi, Carburized, HRC 58–62 | 5,000 rpm | ISO 9001:2015 |
Overall Height: 110–620 mm | Peak Torque: 300% of Rated | Forged 40CrNiMo | 97.0–98.5% | CE Certification |
Overall Width: 95–580 mm | Backlash: ≤ 1 arc-min | GCr15 Bearing Steel | 6,000–95,000 N | ISO 14001 |
Output Shaft Dia.: Φ18–Φ160 mm | Torsional Rigidity: ≥ 3.0 × 10⁶ Nm/rad | 42CrMo, Nitrided | 4,000–70,000 N | RoHS Compliant |
Input Flange Dia.: Φ60–Φ350 mm | Torque Density: 45–70 Nm/kg | SKF / NSK / FAG | ≤ 62 dB(A) | IP65 / IP67 |
(BCD): Φ70–Φ420 mm | Positioning Accuracy: ≤ 0.8 arc-min | Double-Lip NBR / Viton | Lifetime Grease / Oil Bath | ≥ 60,000 h |
Mounting Type: Inline / Flange / Foot | Input Power Range: 0.1–75 kW | Class 12.9 Alloy Steel | –30 to +120 °C | : Up to 20,000 h |
Unit Weight: 6–980 kg | Shock Load Capacity: Up to 500% | Epoxy-Powder Coated | Any | 24–36 months
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Working Mechanism of the Planetary Cycloid Reducer
Input Power Transmission:
The motor drives an eccentric bearing, creating oscillating motion in the cycloidal discs.
Cycloidal Motion Conversion:
The cycloidal discs roll against fixed pins, distributing torque over multiple contact points and minimizing stress concentration.
Planetary Integration & Output:
The slow, high-torque cycloidal motion is transmitted through the planetary stage to the output shaft, producing smooth rotary output with exceptional torque and stability.
This combined principle results in high reduction ratios (1:25 to 1:512) and torque outputs ranging from 500 to 65,000 Nm—with 94–96% overall system efficiency.
Key Features of the Senotay Planetary Cycloid Reducer
Compact hybrid gearbox design for high‑density torque output.
Shock resistance up to 250% overload capacity.
Thermal‑optimized housing for continuous 100% duty cycle operation.
Noise level as low as 50–58 dB(A).
Optional liquid cooling manifold for sustained heavy‑load use.
HVOF WC‑17Co surface coating for wear and corrosion protection.
Compatible servo adapter flanges for easy motor integration.
Core Components
Planetary gear stage (input).
Cycloidal disc assembly (output stage).
Cross roller bearings.
Ductile iron housing with heat‑pipe cooling.
Bi‑material output shaft (Steel‑Titanium).
Smart Sensor Interface (for vibration & temperature monitoring)
Installation Methods
Mounting Type | Designation | Description |
Direct Coupling Flange | FM7 | Compact inline mounting |
Anti-Torsion Base | FM8 | Rigid base for horizontal applications |
Torque Tube Mount | FM9 | For high‑load or offset installations |
Torque bolts should be preloaded to 90% of yield strength to maintain alignment and structural integrity.
Technical Advantages in Senotay Manufacturing
Senotay’s excellence lies in precision hybrid-drive manufacturing and custom engineering under strict international quality control:
3D‑scanned component verification (±2% tolerance).
Fully traceable laser‑etched QR coding for component tracking.
Optional cleanroom (ISO Class 5) and high‑temperature (up to 150°C) versions.
Advanced HVOF or DLC coatings for enhanced surface endurance.
Continuous R&D improvement under AGMA and ISO compliance.
IoT-Ready Smart Operation—supports predictive maintenance via sensor integration.
Frequently Asked Questions (FAQ)
Q1: What is the efficiency of a Senotay Planetary Cycloid Reducer?
A1: Up to 96% efficiency owing to our unique Hybrid Power Split Technology.
Q2: Can this reducer handle high‑shock or heavy‑load conditions?
A2: Yes—our reducers can withstand up to 250% overload for one minute without performance degradation.
Q3: Is it suitable for cleanroom or high‑temperature use?
A3: Absolutely. We offer ISO Class 5 cleanroom and 150°C‑rated models upon request.
Q4: How accurate is the backlash control?
A4: Backlash is typically ≤ 1 arcmin in precision models (as low as ± 0.3 arcmin in custom units).
Q5: Can Senotay provide customized gear ratios?
A5: Yes, we provide custom ratios within ± 2% tolerance to meet unique application demands.
Q6: What is the operational lifespan?
A6: Each reducer is rated for ≥ 80,000 hours @ 110% load with MTBF > 160,000 hours.
