Polyurethane Star Coupling Cushion

Our Polyurethane Star Coupling Cushion (commonly known as a polyurethane jaw coupling spider) is a premium power transmission component engineered to deliver reliable torque transfer, vibration damping, and mechanical protection for industrial machinery. Designed as the core flexible element in jaw-type couplings, this cushion plays a critical role in connecting two shafts while compensating for misalignment, reducing operational stress, and extending the lifespan of coupled equipment.

Crafted from high-grade industrial polyurethane, the star coupling cushion boasts exceptional mechanical properties tailored to demanding power transmission applications. The material is carefully formulated to offer optimal balance between flexibility and rigidity—providing sufficient elasticity to absorb shocks, dampen vibrations, and accommodate angular, parallel, and axial misalignments (up to 0.5° angular and 0.2mm parallel offset) without compromising torque transfer efficiency. Unlike rubber cushions that degrade over time due to oil, heat, or fatigue, polyurethane exhibits superior wear resistance, tear strength, and compression set resistance, ensuring consistent performance even under prolonged heavy loads, high rotational speeds, and harsh operating conditions.

The unique star-shaped design features multiple evenly spaced lobes that fit precisely into the corresponding jaws of the coupling hubs, creating a secure, backlash-free connection. This structural design ensures uniform torque distribution across all lobes, minimizing stress concentration and enhancing overall coupling stability. The polyurethane material’s inherent damping characteristics effectively reduce noise and vibration generated during machinery operation, protecting sensitive components such as motors, pumps, gearboxes, and bearings from damage caused by torsional shocks or resonant vibrations. Additionally, the cushion acts as a mechanical buffer, absorbing impact loads from start-stop cycles or sudden load changes, further safeguarding the entire power transmission system.

Engineered for durability and versatility, our polyurethane star coupling cushion offers excellent resistance to oils, greases, chemicals, solvents, and extreme temperatures (operating range: -40°C to 120°C), making it suitable for use in diverse industrial environments—including manufacturing plants, mining operations, wastewater treatment facilities, agricultural machinery, and power generation systems. It is available in a wide range of standard sizes (compatible with bore diameters from 10mm to 80mm and torque ratings from 5N·m to 500N·m) and custom formulations, with shore hardness options (Shore A 60 to 90) to match specific application requirements: softer cushions for enhanced vibration damping, harder cushions for higher torque capacity.

Installation and maintenance are straightforward: the star cushion can be easily inserted or replaced without disassembling the entire coupling, reducing downtime and maintenance costs. Its lightweight design ensures minimal rotational inertia, contributing to efficient power transmission and energy savings. Each cushion undergoes rigorous quality control testing, including torque capacity, flex fatigue, abrasion resistance, and dimensional accuracy checks, to meet international industrial standards (such as DIN, ISO) and ensure reliable performance in critical applications.

Whether you’re looking to replace worn coupling cushions, upgrade to a more durable solution, or customize a component for specific machinery requirements, our Polyurethane Star Coupling Cushion delivers uncompromising performance, longevity, and value. It is the ideal choice for businesses seeking to enhance the reliability, efficiency, and lifespan of their power transmission systems—where precision engineering meets industrial-grade durability.