High Elastic Coupling for Torsional Vibration Damping

A high elastic coupling is a flexible shaft coupling specifically engineered to transmit torque while compensating for misalignments and absorbing shocks and torsional vibrations. It integrates a highly elastic, non-metallic element between metal hubs to achieve a combination of flexibility, damping, and mechanical reliability, making it suitable for dynamic or vibration-sensitive systems.

Working Principle:
The high elastic coupling functions by transmitting torque through an elastic element made of rubber or other synthetic elastomers. When torque is applied, the elastic component deforms slightly, absorbing shocks and reducing the amplitude of torsional vibrations. This principle allows it to compensate for angular, axial, and radial misalignments between connected shafts without generating excessive reaction forces.

Structure and Components:
Typical high elastic couplings consist of the following main components:
Two metal hubs: Usually made of cast iron, steel, or aluminum alloy, connected to driving and driven shafts.
Elastic element: A replaceable high-elasticity rubber ring or molded elastomer bonded or bolted between the hubs.
Fixing bolts or flanges: Secure the elastic element and ensure reliable torque transmission.
Optional spacer: Used in pump systems or other installations requiring shaft separation.
Depending on the model, the elastic element may be integral, segmental, or buffer type, allowing different damping and alignment capabilities.

Key Features and Advantages:
Excellent Vibration Damping: Effectively suppresses torsional vibrations and noise, protecting connected machinery.
High Elasticity: Accommodates significant shaft misalignments (radial, angular, and axial) without damage.
Shock Absorption: Reduces impact loads during startup, shutdown, and operation.
Fail-Safe Design: Maintains torque transmission even if the elastic element deteriorates (in some models).
Easy Maintenance: Elastic elements are replaceable without disassembling connected equipment.
Corrosion and Wear Resistance: Elastomeric materials resist oil, chemicals, and aging.

Applications:
High elastic couplings are ideal for power transmission systems that require vibration isolation and flexibility. Common applications include:
Diesel engine and generator sets
Marine propulsion systems
Pumps and compressors
Fans and blowers
Textile and printing machinery
Heavy-duty industrial drives

They are particularly favored in systems where dynamic loads, alignment deviations, or vibration sensitivity are present.