Insert Bearings with Housing (Pillow Block Units)
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).
Types & Series
1. Pillow Block Housings (SN, SNU series)
· Most common type for general industrial use.
2. Flange Housings (F, FC series)
· For vertical or side-mounted applications.
3. Take-Up Housings (T, NAT series)
· Adjustable for belt tensioning in conveyor systems.
4. Two-Bolt Housings (SB, SBD series)
· Compact design for space-constrained applications.
Applications
· Conveyor Systems: Roller supports, drive shafts.
· Agriculture: Grain augers, irrigation systems.
· Food Processing: Washdown environments (stainless steel variants).
· Textile Machinery: Low-noise, high-speed operations.
· Ventilation Systems: Fan and blower shafts.
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.
Advantages
· Easy Installation: Pre-assembled unit reduces mounting time.
· Reduced Maintenance: Sealed and pre-lubricated for long service life.
· Misalignment Tolerance: Compensates for shaft/housing misalignment.
· Interchangeability: Standard dimensions per ISO 3228 and ANSI/ABMA standards."