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Henan San Kuang Machinery Technology Co., Ltd. – your reliable partner for precision slewing rings – proudly introduces our Solar Tracker Slewing Ring Low Speed Rotary Support Bearing. As a specialized manufacturer operating a 10,000–30,000 m² factory in Luoyang, China, we have engineered this slewing ring to deliver exceptional durability and smooth rotation under the demanding conditions of photovoltaic tracking systems. With an annual export value of US$2.5–5 million and a dedicated team of 51–100 skilled workers, we combine modern machinery with rigorous quality control to produce bearings that extend the service life of your solar tracker and reduce maintenance costs.
This low-speed rotary support bearing is designed specifically for the continuous tilt and azimuth movements required by solar trackers. It features a robust four-point contact ball design, hardened raceways, and optional gear teeth that integrate seamlessly with your drive system. The bearing’s compact cross-section and high load capacity make it ideal for both single-axis and dual-axis tracker configurations. Every unit is sealed with high-grade double lip seals to prevent dust, moisture, and sand ingress, ensuring reliable performance in harsh outdoor environments.
Key Features & Technical Specifications
- High Load Capacity – Four-point contact ball design supports axial, radial and moment loads simultaneously.
- Low Friction & Smooth Rotation – Precision-ground raceways and optimized internal clearance minimize starting torque and ensure consistent low-speed movement.
- Customizable Gear Options – Available with external gear, internal gear, or no gear; gear teeth can be hardened for wear resistance.
- Excellent Sealing Performance – Double-lip nitrile rubber seals (standard) or labyrinth seals (optional) provide IP54 level protection.
- Corrosion Protection – Zinc phosphate or hot-dip galvanized coating available; stainless steel balls optional for coastal installations.
- Easy Integration – Mounting holes, locating faces, and wiring grooves can be machined according to your tracker interface.
| Parameter | Value Range | Notes |
|---|---|---|
| Inner Diameter (mm) | 500 – 3000 | Custom sizes available upon request |
| Outer Diameter (mm) | 600 – 3500 | Standard matching inner/outer ratio |
| Height (mm) | 50 – 200 | Can be customized for space constraints |
| Rated Dynamic Axial Load (kN) | 100 – 2000 | Depends on size and material |
| Maximum Speed (rpm) | ≤ 10 | Optimized for slow tracking rotation |
| Operating Temperature (°C) | -30 to +80 | High-temp grease available for desert projects |
| Gear Module | 4 – 20 (optional) | Hobbing or shaping according to DIN/ISO |
Why choose our low-speed rotary support bearing for your solar tracker? The bearing’s specially designed raceway curvature and hardened 42CrMo steel rings ensure a long service life even under continuous oscillation. Field tests demonstrate that our slewing rings maintain consistent rotational accuracy within 0.05 mm after 100,000 cycles. For customers requiring additional corrosion resistance, we offer hot-dip galvanized raceways and stainless steel balls as upgrade options. The integrated mounting flange holes come pre-drilled according to your tracker drawing, saving you assembly time. With low friction torque (starting torque ≤ 5% of rated moment load), your tracker actuator can be sized smaller, reducing overall system cost.
Our manufacturing process follows strict quality control procedures: raw material chemical analysis, ultrasonic testing for forging defects, CNC machining with tolerances down to IT7, 100% dimensional inspection, and a complete functional run test before shipment. Each bearing is supplied with a lubrication nipple and filled with lithium-based grease. We can also supply the slewing ring with a pre-installed pinion for direct motor coupling.
We serve a global customer base across North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and many other regions. Our products are shipped from major ports including Shanghai, Lianyungang, Qingdao, and Tianjin, ensuring efficient logistics. With US$2.5–5 million annual export value and a responsive after-sales team, we deliver reliable support worldwide. Whether you are developing a utility-scale solar farm or a distributed tracking system, our slewing ring bearing offers the performance and longevity you need.
Contact us today for a detailed quotation and engineering drawing. We are ready to provide you with a robust solution that maximizes your energy yield while minimizing total cost of ownership.
Frequently Asked Questions
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Q: What is the typical delivery time for this slewing ring?
A: Standard sizes (inner diameter 500-1500mm) can be delivered in 15-20 working days after order confirmation. Custom sizes may require 25-35 working days depending on complexity. -
Q: Can the bearing be used for horizontal or vertical trailer mounting?
A: Yes, our four-point contact ball design supports both axial and radial loads, making it suitable for both horizontal (azimuth) and vertical (tilt) tracker applications. Please specify the mounting orientation when ordering so we can confirm the internal clearance class. -
Q: Do you provide warranty?
A: We provide a standard 12-month warranty from the date of shipment against manufacturing defects. Extended warranty options are available upon request. -
Q: What type of grease should I use?
A: We recommend a lithium-complex grease with NLGI grade 2 for normal settings. For high-temperature environments (above 60°C), we suggest a synthetic oil-based grease. Each bearing is supplied pre-greased, but periodic re-lubrication intervals depend on the duty cycle; we can provide a maintenance schedule with your order. -
Q: Can I get a sample before mass production?
A: Yes, we accept sample orders. The lead time for a sample is roughly 20 days. The cost of the sample and shipping can be deducted from your first mass order if the sample meets your approval. -
Q: How do you ensure the bearing’s quality?
A: Our QC covers raw material certification, heat treatment hardness testing, raceway surface roughness measurement (Ra ≤ 0.4 μm), gear tooth inspection with a coordinate measuring machine, and a full static load test. Each batch is accompanied by an inspection report. -
Q: Do you offer customized gear teeth?
A: Yes, we can produce external or internal gear teeth with modules from 4 to 20. We can also machine custom tooth profiles, backlash adjustment features, and retention ring grooves per your drawing. -
Q: Is the bearing suitable for coastal solar farms with high salt spray?
A: Absolutely. For coastal use, we recommend the optional hot-dip galvanized raceway and stainless steel ball configuration. The standard nitrile double-lip seal already provides good salt spray resistance. We can also supply an additional protective bellows if needed.
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