⚙ Key Features
1. Self-Aligning Design
The spherical outer surface of the bearing and matching spherical bore of the housing allow ±2–5° angular misalignment compensation. Eliminates stress concentrations caused by shaft deflection or installation errors.
2. Sealing Options
· Standard Seals: Triple-lip contact seals (e.g., 2RS type) for dust/moisture resistance.
· Enhanced Seals: Multi-layer labyrinth seals for harsh environments (e.g., wastewater treatment).
· Grease Retention: Seals retain lubricant and exclude contaminants.
3. Clamping Mechanisms
· Set Screw Type (e.g., UC series): Two set screws lock the bearing onto the shaft.
· Eccentric Collar Type (e.g., UE series): Eccentric collar provides secure shaft locking.
· Adapter Sleeve Type (e.g., UK series): Tapered adapter sleeve for easy mounting/dismounting.
4. Housing Materials
· Cast Iron Housings: High rigidity and impact resistance (e.g., SN series).
· Stamped Steel Housings: Lightweight and cost-effective (e.g., SD series).
· Stainless Steel Housings: For corrosive environments (e.g., SS series).
🔩 Product Structure
Bearing Component
Wide inner ring for secure shaft locking. Heat-treated chromium steel rings and balls.
Housing Component
Base with mounting holes (bolt or slot types). Reinforced ribs for structural stability.
Sealing System
Triple-lip rubber seals (standard) or PTFE seals for high temperatures.
Lubrication
Pre-greased with lithium-based grease (standard). Grease nipple for relubrication (optional).
📐 Technical Specifications
Shaft Diameter Range
20 mm to 100 mm (common sizes)
Operating Temperature
-30°C to +120°C (standard seals)
Limiting Speed
50–80% of deep groove ball bearings due to seals
Load Capacity
Primarily radial loads; limited axial capacity
✔ Selection Guidelines
1. Shaft Fixation Method
Choose set screw type for simplicity; eccentric collar for high-vibration environments.
2. Housing Material
Cast iron for heavy loads; stamped steel for lightweight applications.
3. Sealing
Use triple-lip seals for dusty/moist conditions; PTFE seals for high temperatures.
4. Lubrication
Relubrication options required for continuous operation or high temperatures.
? Frequently Asked Questions
Q
What angular misalignment can a pillow block bearing unit compensate?
Standard pillow block bearing units with a spherical outer surface can compensate for angular misalignment of ±2–5°. This self-aligning capability effectively eliminates stress concentrations caused by shaft deflection or installation errors, extending the service life of the bearing assembly.
Q
What shaft diameter sizes are available for pillow block bearing units?
The common shaft diameter range covers 20 mm to 100 mm, accommodating a wide variety of industrial applications. Custom or extended size ranges may be available — please consult product datasheets or contact our technical team for specific requirements.
Q
Which clamping mechanism is recommended for high-vibration environments?
The eccentric collar type (e.g., UE series) is preferred for high-vibration conditions. Unlike set screws, which can loosen under continuous vibration, the eccentric collar locks securely around the shaft and maintains its grip throughout demanding operating cycles.
Q
Are pillow block bearing units suitable for food processing or washdown environments?
Yes. Stainless steel housing variants (SS series) are specifically engineered for corrosive and high-moisture environments such as food processing plants. They resist rust, withstand frequent washdowns, and comply with hygiene standards required in food-grade applications.
Q
What is the operating temperature range for standard pillow block bearing units?
Standard units with rubber seals operate reliably between -30°C and +120°C. For applications that exceed this range, PTFE seals are available as an upgrade, offering improved thermal stability and extended performance at elevated temperatures.
Q
Do pillow block bearing units require regular relubrication?
Standard units come pre-filled with lithium-based grease and are sealed for maintenance-free operation under normal conditions. For continuous-duty or high-temperature applications, units with optional grease nipples allow periodic relubrication to replenish the lubricant and maximize bearing service life.
