INDUSTRY COMPONENT

Gear Hub

Gear hub is the central mounting component of polypropylene injection molded gear wheels, providing structural support and torque transmission.

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Component Specifications

Definition
A gear hub is the central cylindrical component of an injection molded gear wheel that serves as the interface between the gear teeth and the shaft. In polypropylene injection molded gears, the hub is integrally molded with the gear body, featuring precise bore dimensions, keyways or splines for torque transmission, and mounting features. It distributes rotational forces from the shaft to the gear teeth while maintaining alignment and minimizing stress concentrations.
Working Principle
The gear hub operates by transmitting torque from the rotating shaft to the gear teeth through mechanical interference (press-fit), keyways, splines, or set screws. It converts shaft rotation into gear movement while maintaining concentricity and load distribution across the gear profile. In polypropylene gears, the hub's design accommodates material flexibility and thermal expansion characteristics.
Materials
Polypropylene (PP) homopolymer or copolymer, typically with 20-40% glass fiber reinforcement (PP-GF20 to PP-GF40) for enhanced stiffness and dimensional stability. Material specifications include ISO 1873-1, ASTM D4101.
Technical Parameters
ParameterTypical rangeNotes & selection driver
Hub Length10-40 mm
Spline TypeInvolute splines per ISO 4156
Keyway Width3-12 mm (ISO 773)
Bore Diameter8-50 mm (standard range)
Surface FinishRa 1.6-3.2 μm
Wall Thickness3-8 mm
Runout Tolerance0.05-0.1 mm

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 1328-1, ISO 4156, DIN 5480, DIN 5482

Parent Products

This component is used in the following industrial products

Polypropylene Injection Molded Gear Wheel

Precision plastic gear component manufactured via injection molding for mechanical power transmission.

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Helical/Bevel Gears

Gear components in a main drive gearbox that transmit power and motion between non-parallel shafts.

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Main Reduction Gear

The primary gear component within an elevation gear assembly responsible for achieving the main speed reduction and torque multiplication.

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Engineering Analysis

Risks & Mitigation
  • Stress cracking from improper interference fits
  • Thermal expansion mismatch with metal shafts
  • Creep deformation under continuous load
  • Wear from abrasive contaminants
FMEA Triads
Trigger: Excessive interference fit between hub and shaft
Failure: Hub cracking or splitting during assembly or operation
Mitigation: Optimize interference fit using FEA analysis, implement controlled press-fit procedures, add stress relief features in hub design
Trigger: Thermal cycling in operating environment
Failure: Loss of interference fit due to differential expansion between PP hub and metal shaft
Mitigation: Select materials with compatible thermal expansion coefficients, use retaining compounds, implement temperature-controlled environments
Trigger: Inadequate keyway or spline design
Failure: Shearing of torque transmission features under peak loads
Mitigation: Follow ISO/DIN standards for keyway/spline dimensions, implement proper fillet radii, consider splined hubs for higher torque applications

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
ISO 2768-mK for general dimensions, ISO 286 for bore fits (typically H7 for PP hubs)
Test Method
Dimensional inspection per ISO 1328-1, torque testing per ISO 6336-1, thermal cycling per IEC 60068-2-14

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
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Gear Hub

Manufacturer profiles associated with Gear Hub.

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Frequently Asked Questions

What are the advantages of polypropylene for gear hubs?

Polypropylene offers excellent chemical resistance, low moisture absorption, good fatigue resistance, and cost-effectiveness. Glass fiber reinforcement improves stiffness, dimensional stability, and heat deflection temperature.

How do you prevent hub cracking in polypropylene gears?

Prevent hub cracking through proper design with adequate fillet radii, uniform wall thickness, appropriate interference fits, and controlled assembly procedures. Material selection with proper glass fiber content and additives also helps.

What lubrication is required for polypropylene gear hubs?

Polypropylene gears typically require minimal lubrication. When needed, use silicone-based or synthetic lubricants compatible with plastics. Avoid petroleum-based oils that may cause swelling or degradation.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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