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Flexible Jaw Coupling
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Apex Coupling: Your OEM/ODM Partner for High-Performance Flexible Shaft Couplings. We provide custom-designed, durable couplings for various industries, ensuring perfect fit and reliable power transmission. Get your solution now!
What is flexible jaw coupling?
It is a mechanical device that connects two rotating shafts. It consists of three main components:
Two Aluminum or Steel Hubs: Each hub attaches to a shaft (e.g., a motor shaft and a pump shaft). Each hub has several “jaws” or lobes protruding from it.
An Elastomeric “Spider”: This is a flexible, star-shaped insert made of a material like NBR (Nitrile Rubber), Polyurethane, or Hytrel. It fits snugly between the jaws of the two hubs.
The spider is the heart of the coupling, providing all its flexibility and damping properties.
How It Works & Key Features
| Feature | How it Works & Why it Matters |
|---|---|
| Torque Transmission | Torque is transmitted from the first hub’s jaws, through the spider, to the second hub’s jaws. |
| Misalignment Compensation | The flexibility of the spider allows it to compress and deform, accommodating angular, parallel, and axial misalignment between the two shafts. |
| Vibration Damping & Shock Absorption | The elastomeric spider absorbs vibrations and softens shock loads from one shaft, preventing them from being transmitted to the other. This protects motors, bearings, and driven equipment. |
| Electrical Insulation | The non-metallic spider electrically isolates the two shafts, preventing the flow of stray electrical currents that can damage bearings. |
| Maintenance-Free & No Lubrication | Jaw couplings do not require any lubrication, making them a “fit-and-forget” component in many applications. |
| Backlash | Standard jaw couplings have a small amount of backlash (slight free movement) due to the clearances needed for the spider to function. Zero-backlash designs are available for precise applications. |
Advantages vs. Disadvantages
| Advantages | Disadvantages |
|---|---|
| ✔ Excellent Vibration Damping | ❌ Not True Zero-Backlash (standard types) |
| ✔ No Lubrication Needed | ❌ Spider Wears Over Time and Requires Replacement |
| ✔ Good Misalignment Capacity | ❌ Limited High-Temperature Capability (depends on spider material) |
| ✔ Easy to Install & Maintain | ❌ Not Ideal for Ultra-High-Precision Servos |
| ✔ Cost-Effective |
Common Applications
Jaw couplings are the go-to solution for a vast range of general industrial applications, including:
Pump Systems (The most common application)
Compressors and Fans
Conveyor Systems
Agitators and Mixers
General Machine Tools
In summary, a Flexible Jaw Coupling is a simple, robust, and cost-effective solution for connecting shafts in equipment where misalignment, vibration, and shock loads are primary concerns. Its replaceable spider makes maintenance quick and easy, minimizing downtime.
Customization options, customized on demand, sample processing, graphic processing.
Product Support traceability of raw materials
Quality control conducted on all production lines.
R&D engineer education levels3 graduate
Choose Confidence. Choose Safety.
Contact us today to discuss how our certified quality and safety standards can protect your operations. Request a quote and receive full technical data sheets for your evaluation.
Our Commitment to You:
We guarantee that every coupling leaving our facility is built to perform safely and reliably. Our quality is not just a promise—it’s a result of a systematic, verifiable process built into everything we do.
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