INDUSTRY COMPONENT

Flexible Body/Spider

Flexible coupling component that transmits torque while accommodating misalignment and vibration in mechanical systems.

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Component Specifications

Definition
A flexible body/spider is a critical elastomeric or polyurethane element within flexible couplings that connects two shafts, allowing for angular, parallel, and axial misalignment while damping vibrations and absorbing shock loads. It provides torsional flexibility to protect connected equipment from torque spikes and reduces wear on bearings and seals.
Working Principle
Works through elastic deformation of its flexible material (typically polyurethane or rubber) when torque is applied, allowing it to twist slightly to accommodate shaft misalignment while maintaining torque transmission. The spider-shaped design with multiple legs distributes stress evenly and provides damping characteristics.
Materials
Polyurethane (most common), Nitrile rubber (NBR), Hytrel, Neoprene, or other engineered elastomers with specific hardness ratings (typically Shore A 92-98 for polyurethane).
Technical Parameters
  • Max RPM 5000-10000
  • Hardness Shore A 92-98
  • Bore Sizes 3-100 mm
  • Torque Capacity 0.5-5000 Nm
  • Temperature Range -40°C to +100°C
  • Misalignment Compensation Angular: 1-4°, Parallel: 0.2-3 mm, Axial: ±0.5-2 mm
Standards
ISO 9001, DIN 740, ISO 14691, AGMA 9000

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Flexible Body/Spider.

flexible coupling spider elastomeric coupling element polyurethane spider shaft coupling component misalignment compensation torque transmission vibration damping Flexible Body/Spider Flexible Body/Spider in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Coupling Element

A mechanical component within a precision gearbox or coupling system that transmits torque while accommodating misalignment between connected shafts.

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Engineering Analysis

Risks & Mitigation
  • Material degradation from oil/chemical exposure
  • Overheating from excessive misalignment
  • Premature failure from improper installation
  • Torsional resonance at certain RPM ranges
FMEA Triads
Trigger: Excessive misalignment beyond design limits
Failure: Premature cracking and tearing of spider legs
Mitigation: Regular alignment checks and use of laser alignment tools during installation
Trigger: Chemical exposure incompatible with material
Failure: Swelling, softening, or hardening leading to loss of flexibility
Mitigation: Select appropriate material (e.g., polyurethane for oils, NBR for chemicals) and implement protective covers
Trigger: Over-torque conditions
Failure: Permanent deformation or shearing of spider elements
Mitigation: Install torque limiters and regularly monitor operating conditions

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1 mm on bore dimensions, ±2° on angular positioning
Test Method
Dynamic torque testing per ISO 14691, hardness testing per ASTM D2240, fatigue testing with cyclic misalignment

Buyer Feedback

★★★★☆ 4.7 / 5.0 (30 reviews)

"The technical documentation for this Flexible Body/Spider is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Flexible Body/Spider so far."

"Testing the Flexible Body/Spider now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the main purpose of a flexible body/spider in couplings?

To transmit torque between shafts while accommodating misalignment (angular, parallel, axial), damping vibrations, and protecting equipment from shock loads through elastic deformation.

How often should flexible spiders be replaced?

Typically every 12-24 months depending on operating conditions, but inspect quarterly for cracks, hardening, or permanent deformation. High-torque or misaligned applications require more frequent replacement.

Can different material spiders be used interchangeably?

No, material properties affect torque capacity, temperature resistance, and chemical compatibility. Always use the manufacturer-specified material for your application requirements.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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