Center Hub: Bore Size 40-80 mm, Diameter 150-300 mm

Q: What is the primary function of a Center Hub in starwheel assemblies?

The Center Hub serves as the central rotating element that provides precise angular positioning, transmits torque, and maintains alignment between the drive system and starwheel segments during indexing operations.

Q: How does material selection affect Center Hub performance?

Material selection determines wear resistance, load capacity, and corrosion resistance. Case-hardened alloy steels provide optimal strength and durability for most applications, while stainless steels offer better corrosion resistance in harsh environments.

Q: What maintenance is required for Center Hubs?

Regular inspection for wear, lubrication of bearings, checking of mounting bolt torque, and verification of runout tolerances. Replacement is typically required when runout exceeds 0.05 mm or when surface wear affects indexing accuracy.

Component Specifications

Definition

The Center Hub is a critical rotating component in starwheel body assemblies that provides the central axis for starwheel rotation, ensures precise angular positioning during indexing operations, and transmits torque from the drive system to the starwheel segments. It maintains concentricity and radial alignment while supporting radial and axial loads during high-speed indexing cycles.

Working Principle

The Center Hub operates as the central pivot point in a starwheel assembly, converting rotational input from the drive mechanism into precise intermittent motion. It utilizes precision bearings and mounting surfaces to maintain positional accuracy while distributing mechanical loads evenly across the starwheel structure during indexing and dwell phases.

Materials

Case-hardened alloy steel (typically AISI 8620 or 4140) with surface hardness of 58-62 HRC, core hardness of 28-32 HRC. Alternative: Stainless steel (17-4PH) for corrosive environments.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Weight	5-25 kg
Max RPM	60-120
Diameter	150-300 mm
Bore Size	40-80 mm
Axial Runout	<0.015 mm
Radial Runout	<0.02 mm
Mounting Holes	6-12 equally spaced
Surface Finish	Ra 0.8 μm

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

Standards

ISO 286-2, DIN 7184, ISO 1101

Parent Products

This component is used in the following industrial products

Starwheel Body

The main structural component of a container infeed starwheel that provides mounting points for starwheel arms and guides containers during transfer.

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Engineering Analysis

Risks & Mitigation

Bearing failure due to inadequate lubrication
Fatigue cracking from cyclic loading
Wear-induced positional inaccuracy
Corrosion in humid environments
Thermal expansion affecting tolerances

FMEA Triads

Trigger: Insufficient lubrication
Failure: Increased friction and premature bearing wear
Mitigation: Implement automated lubrication systems and regular maintenance schedules

Trigger: Cyclic loading beyond design limits
Failure: Fatigue cracks in hub body
Mitigation: Install load monitoring sensors and enforce operational speed limits

Trigger: Corrosive environment exposure
Failure: Surface degradation and dimensional changes
Mitigation: Use corrosion-resistant materials or protective coatings

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.01 mm for critical dimensions, geometric tolerances per ISO 1101

Test Method

Coordinate measuring machine (CMM) verification, runout testing with dial indicators, hardness testing per ISO 6508

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Center Hub

Manufacturer profiles associated with Center Hub.

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Frequently Asked Questions

What is the primary function of a Center Hub in starwheel assemblies?