Sealing Excellence, Securing Industry

CFKS Jaw Coupling Spider GR 5 Polyurethane Spider Gearbox Flexible Insert

The CFKS GR 5 Polyurethane Spider is a high-performance flexible insert designed to transmit torque safely while protecting sensitive gearbox components from destructive shock loads. Engineered for jaw-style elastomeric couplings, this star-shaped element acts as a critical mechanical cushion, ensuring smooth and reliable power transmission between driving and driven shafts in industrial automation.

  • Superior Torsional Damping: Absorbs dynamic shock loads and significantly reduces operational noise in high-torque drivetrains.

  • Misalignment Compensation: Intelligently accommodates angular, parallel, and axial shaft deviations without imposing heavy bearing loads.

  • Exceptional Wear Resistance: Premium Polyurethane construction resists degradation from gearbox oils, ozone, and continuous mechanical fatigue.

Find your sealing solution with CFKS — contact us for a quote.

Brand Name CFKS OEM  Accpetable
Material NBR FKM Silicone  Features  wear resistance
Dimensions Customized Certificate  ISO9001/TS16949
Type Coupling Spider  Packing 1 pc per bag

 

1️⃣ NBR Jaw Type Coupling Spider for Stable Power Transmission

The fundamental engineering role of the CFKS GR 5 spider is to facilitate torsionally flexible power transmission. Placed between two interlocking metallic hubs, the elastomeric spider transmits torque purely through compression, rather than shear forces. As the driving motor initiates rotation or experiences torque spikes, the involute-shaped lobes of the spider compress. This compression converts kinetic energy into minimal thermal energy, effectively dampening torsional resonance and preventing shock waves from traveling down the driveline and fracturing expensive gearbox internals.

2️⃣ Wear Resistant & Oil Resistant Performance

In demanding mechanical power transmission, standard rubber (NBR) inserts frequently fail due to low shear strength and rapid aging. Our GR 5 spiders are injection-molded from a highly engineered Polyurethane (PU) elastomer. Depending on your application’s torque requirements, these are typically formulated in distinct Shore hardness levels (e.g., 92 Shore A for maximum damping, or 98 Shore A for higher torque capacity). This PU matrix provides a load-bearing capacity that rivals some plastics, while retaining the elasticity of rubber. Furthermore, it boasts near-total immunity to the synthetic lubricants, hydraulic fluids, and petroleum-based contaminants commonly found in industrial gearbox environments.

3️⃣Standard Size for Easy Installation

From a plant maintenance perspective, the jaw coupling design offers unmatched operational security. The CFKS GR 5 spider allows for simple “blind assembly”—meaning the motor and gearbox can be pushed together without requiring precise visual alignment of the internal components. It is a strictly dry-running system, eliminating the need for periodic grease lubrication. Crucially, the system features a “fail-safe” geometry: if the polyurethane spider is completely destroyed under a catastrophic overload, the interlocking metal jaws of the hubs will continue to drive the load. While this generates immediate audible noise to alert operators, it prevents a sudden loss of power in critical lifting or pumping applications.

Frequently Asked Questions (FAQ)

Why does my CFKS oil seal fail prematurely? Common causes and prevention tips2025-06-26T15:44:39+08:00

Premature oil seal failure can result from improper installation, poor shaft finish, incorrect material selection, or excessive pressure. To prevent this, ensure the shaft surface is smooth and within tolerance, use correct tools during installation, and choose seals made from materials compatible with your media and temperature.

How to correctly install a CFKS industrial oil seal to avoid leakage2025-06-26T16:04:32+08:00

Always clean the shaft and bore before installation. Use appropriate seal drivers to avoid deformation. Lubricate the lip before fitting to reduce friction during the first rotation. Ensure the seal is seated evenly and not tilted to avoid leaks.

What to do when your CFKS hydraulic seal is leaking under pressure2025-05-20T16:33:14+08:00

Check if the pressure exceeds the seal’s rated limit. Examine for wear, hardening, or improper installation. Replace the seal if damaged, and consider upgrading to a high-pressure CFKS seal variant. Also, verify that the housing and shaft are properly aligned.

How to choose the right CFKS oil seal for extreme operating environments2025-05-20T16:34:39+08:00

For high temperatures, aggressive chemicals, or abrasive environments, choose CFKS seals made of FKM, PTFE, or high-performance elastomers. Consider using seals with protective dust lips or metal casing. Our team can recommend the best fit for your application.

 

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