Roll Bearing Housing for Pinch Rolls | Component Specifications

Product Specifications

Technical details and manufacturing context for Roll Bearing Housing

Definition

The roll bearing housing is a critical component within the pinch roll assembly that provides secure mounting, alignment, and protection for the bearings that support the pinch rolls. It ensures proper load distribution, maintains bearing positioning under operational stresses, and facilitates lubrication access while protecting bearings from contaminants in industrial environments. The housing is typically manufactured from cast iron, ductile iron, or cast steel, with material grades such as HT200–HT300 (per GB/T 9439) offering tensile strengths of 200–300 MPa and hardness values of 170–240 HB (per GB/T 231.1). Key dimensional parameters include a bore diameter of 100–500 mm (matching the bearing outer diameter, per ISO 286), an overall width of 50–200 mm, a center height of 80–300 mm (critical for shaft alignment), bolt hole spacing of 120–400 mm (per ISO 273), and bolt hole diameter of 12–30 mm (for M10–M24 bolts). The bore tolerance is H7 (per ISO 286), and surface roughness for sealing surfaces is Ra 1.6–3.2 μm (per ISO 1302). The housing operates within a temperature range of -20 to 80°C and weighs 20–150 kg, affecting handling and installation. These values are directory reference ranges and must be confirmed for the actual model and application with the legal manufacturer or supplier. The housing provides a rigid, precisely machined enclosure that positions bearings at optimal locations relative to the pinch rolls. It transfers radial and axial loads from the rotating rolls through the bearings to the machine frame, maintains bearing alignment under varying operational conditions, and often incorporates sealing systems to retain lubricants and exclude contaminants. Proper selection requires verifying bore diameter, center height, bolt hole spacing, and material grade against the specific bearing and mounting pattern. Maintenance signals include increased vibration, noise, or temperature, which may indicate bearing wear or misalignment. Failure boundaries include exceeding the operating temperature range, which can cause seal failure, or applying loads beyond the housing's structural capacity, leading to cracking or deformation. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The housing provides a rigid, precisely machined enclosure that positions bearings at optimal locations relative to the pinch rolls. It transfers radial and axial loads from the rotating rolls through the bearings to the machine frame, maintains bearing alignment under varying operational conditions, and often incorporates sealing systems to retain lubricants and exclude contaminants. The housing's bore is machined to H7 tolerance to ensure proper bearing fit, and its surface roughness on sealing surfaces is controlled to Ra 1.6–3.2 μm to support effective sealing. The housing also facilitates lubrication access, allowing grease or oil to reach the bearings while keeping out dirt and moisture. Under operational stresses, the housing maintains bearing positioning, preventing misalignment that could lead to premature wear or failure. The material's tensile strength and hardness, such as HT200–HT300 with 200–300 MPa and 170–240 HB, provide the necessary rigidity and damping to absorb shock and vibration. The operating temperature range of -20 to 80°C defines the limits within which the housing and its seals can function reliably. Beyond this range, seals may fail, and the housing's dimensional stability could be compromised. The housing's weight, ranging from 20 to 150 kg, affects handling and installation procedures.

Common Materials

Cast iron, Ductile iron, Cast steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bore Diameter	100–500 mm	Matches bearing outer diameterISO 286
Overall Width	50–200 mm	Depends on bearing width and housing design
Center Height	80–300 mm	Critical for shaft alignment
Bolt Hole Spacing	120–400 mm	Must match mounting patternISO 273
Bolt Hole Diameter	12–30 mm	For M10–M24 boltsISO 273
Material Grade	HT200–HT300	Cast iron for strength and dampingGB/T 9439
Tensile Strength	200–300 MPa	Minimum for structural integrityGB/T 9439
Hardness	170–240 HB	Ensures wear resistanceGB/T 231.1
Surface Roughness	Ra 1.6–3.2 μm	For sealing surfacesISO 1302
Bore Tolerance	H7	Ensures proper bearing fitISO 286
Operating Temperature	-20–80 °C	Beyond this, seals may fail
Weight	20–150 kg	Affects handling and installation

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Housing Body Part
Main structural element providing bearing enclosure and load transfer

Material: Cast iron or steel
Bearing Seat Part
Precisely machined surface for bearing outer ring fit and alignment

Material: Same as housing body
Sealing Grooves Part
Channels for installing seals to retain lubricant and exclude contaminants

Material: Same as housing body
Mounting Flange Part
Surface with bolt holes for securing housing to machine frame

Material: Same as housing body
Lubrication Port Part
Opening for introducing lubricant to bearings

Material: Same as housing body

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Pinch Roll Assembly

View system integration details

Manufacturers of Roll Bearing Housing

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Frequently Asked Questions

What materials are used for roll bearing housings?

According to the directory, roll bearing housings are typically made from cast iron, ductile iron, or cast steel. Material grades such as HT200–HT300 (per GB/T 9439) are listed, with tensile strengths of 200–300 MPa and hardness of 170–240 HB. Always confirm the specific material grade with the manufacturer for your application.

What are the key dimensional parameters to consider?

Key parameters include bore diameter (100–500 mm, matching bearing outer diameter, per ISO 286), overall width (50–200 mm), center height (80–300 mm), bolt hole spacing (120–400 mm, per ISO 273), and bolt hole diameter (12–30 mm). These are reference ranges; verify exact values for your model.

How does the housing ensure proper bearing alignment?

The housing is precisely machined to provide a rigid enclosure that positions bearings correctly relative to the pinch rolls. The bore tolerance is H7 (per ISO 286) to ensure a proper fit. It transfers loads to the machine frame and maintains alignment under operational stresses, preventing misalignment that could cause premature wear.

What are the operating limits for the housing?

The operating temperature range is -20 to 80°C. Beyond this range, seals may fail. The housing is designed for loads within its structural capacity, with tensile strength of 200–300 MPa. Always consult the manufacturer for specific load ratings and environmental limits.

Data Basis

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Preliminary Technical Classification

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pressure:	Max 10 MPa (100 bar) static, 5 MPa (50 bar) dynamic
other spec:	Max shaft speed: 3000 RPM, Load capacity: 50-500 kN depending on size, Sealing: IP65/IP67 standard
temperature:	-20°C to 150°C (standard), up to 200°C with high-temp seals/lubricants

Roll Bearing Housing

Product Specifications

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