High-Quality Long Lasting Bearing Housings from China Suppliers | Reliable Factory Solutions
Key Functions
1. Bearing Support
▸Secure bearing outer rings to transfer loads to machine structures.
2. Misalignment Compensation
▸Self-aligning designs (e.g., spherical housings) tolerate shaft/housing misalignment.
3. Contamination Protection
▸Integrated seals guard against dust, moisture, and debris.
4. Lubrication Management
▸Grease fittings/oil ports enable efficient relubrication.
Common Types
1. Pillow Block Housings SN/SNU Series
▸Material: Cast iron (SN), stamped steel (SD), or stainless steel.
▸Applications: Conveyors, agricultural machinery.
2. Flange Block Housings F/FC Series
▸Mounting: Vertical or side-facing bolt patterns.
▸Applications: Motors, pumps.
3. Take-Up Housings T/NAT Series
▸Adjustability: Sliding design for belt/chain tensioning.
4. Two-Bolt Housings SB/SB2 Series
▸Compactness: Space-saving design for light-duty applications.
Materials & Coatings
●Cast Iron: High strength and damping properties (e.g., ASTM A48).
●Stamped Steel: Lightweight and cost-effective.
●Stainless Steel: Corrosion resistance (e.g., AISI 304/316).
●Coatings: Zinc plating or epoxy paint for environmental protection.
Sealing Options
●Rubber Seals (RS): Contact seals for moderate environments.
●Labyrinth Seals: Non-contact, high-temperature resistance.
●V-Ring Seals: For shaft-mounted protection.
Applications
●Material Handling: Conveyor rollers, pulley systems.
●Food & Beverage: Washdown environments (stainless steel units).
●Mining & Construction: Heavy-duty equipment with reinforced designs.
●HVAC Systems: Fan and blower assemblies.
Selection Criteria
1. Bearing Compatibility
▸Match housing bore to bearing outer diameter (e.g., SN series for 62/63 bearings).
2. Load Direction
▸Pillow blocks for radial loads; flange blocks for axial/radial combinations.
3. Environmental Conditions
▸Choose seals and materials accordingly (e.g., FDA-approved grease for food processing).
4. Shaft Fixation
▸Eccentric collars or set screws for secure shaft locking.
Advantages
●Simplified Maintenance: Pre-aligned and pre-lubricated units reduce downtime.
●Interchangeability: Standardized dimensions per ISO/ANSI standards.
●Durability: Robust construction for shock and vibration resistance.
Frequently Asked Questions
QWhat is the difference between a pillow block housing and a flange block housing?
Pillow block housings (SN/SNU series) mount horizontally and are best suited for radial loads, commonly used in conveyors and agricultural machinery. Flange block housings (F/FC series) feature vertical or side-facing bolt patterns, making them ideal for axial and radial load combinations in motors and pumps.
QWhich bearing housing material is best for corrosive or washdown environments?
Stainless steel housings (AISI 304/316) are the preferred choice for corrosive or washdown environments, such as food & beverage processing facilities. They can be paired with FDA-approved grease and appropriate seals for full compliance with hygiene standards.
QHow do I select the correct sealing option for my bearing housing?
Selection depends on your operating environment. Rubber seals (RS) work well in moderate conditions with contact sealing. Labyrinth seals are non-contact and suited for high-temperature applications. V-ring seals provide additional shaft-mounted protection where axial sealing is needed.
QWhat does self-aligning mean in the context of bearing housings?
Self-aligning housings, typically featuring spherical outer surfaces, allow the bearing to automatically compensate for minor shaft or housing misalignment. This reduces stress on the bearing and extends service life, especially in applications where perfect alignment is difficult to achieve during installation.
QAre bearing housings interchangeable between different manufacturers?
Yes, in most cases. Bearing housings are manufactured to ISO and ANSI standardized dimensions, which means units from different manufacturers within the same series (e.g., SN 505, F 205) are generally interchangeable. Always verify bore size, bolt pattern, and series designation before substituting.
QHow are bearings secured inside the housing to prevent shaft movement?
Bearings are typically secured using eccentric locking collars or set screws, both of which grip the shaft to prevent axial movement. Eccentric collars offer a more secure and vibration-resistant lock, while set screws are simpler and suitable for lighter-duty applications.