INDUSTRY COMPONENT

Center Hub

Precision central hub component for starwheel body assemblies in rotary indexing machines

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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
  • 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
Standards
ISO 286-2, DIN 7184, ISO 1101

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Center Hub.

center hub starwheel hub rotary index hub transfer machine component precision hub indexing mechanism industrial automation parts Center Hub in Machinery and Equipment Manufacturing

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

Interchangeable Parts

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

Buyer Feedback

★★★★☆ 4.6 / 5.0 (39 reviews)

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Center Hub so far."

"Testing the Center Hub now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

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Frequently Asked Questions

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.

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.

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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Center Central Drive Shaft