High Torque Flexible Shaft Coupling GIICL Drum Gear Coupling (Narrow Type)

The GIICL coupling is a drum-shaped gear coupling that transmits torque between two rotating shafts using meshed internal and external teeth. The "narrow type" (GIICL) features a reduced outside diameter compared to standard types, making it suitable for compact installations without compromising torque capacity or alignment flexibility. It conforms to Chinese standard JB/T 8854.2-2001, and its design is widely accepted in power transmission equipment across heavy industries.

Working Principle
The GIICL coupling operates through the meshing of crowned external teeth on the hub with internal teeth in the sleeve. As torque is applied, it is transferred through the tooth contact surfaces. The crowned shape of the gear teeth allows the coupling to accommodate angular displacement and slight axial movement, while still maintaining a high torque transmission capability. This friction-and-engagement mechanism ensures continuous and efficient power delivery even under misalignment or load fluctuation.

Structure and Composition
The GIICL narrow type gear coupling is composed of:
Two Hubs with External Drum-Shaped Gear Teeth: Each mounted on the shaft, featuring crowned teeth for better angular compensation.
Two Internal Sleeves (Outer Shells): House the external teeth of the hubs and maintain axial positioning.
Sealing Rings: Installed at both ends to retain lubricant and prevent contamination.
Fastening Bolts: Used to connect the sleeves securely, forming a closed system.
High-Quality Steel Construction: Typically forged alloy steel, surface treated for wear and corrosion resistance.
Lubrication Ports: Provide a means for periodic grease or oil application to reduce wear and extend service life.

Key Features and Advantages
Compact Size: Narrow outer diameter allows installation in restricted spaces without sacrificing performance.
High Torque Capacity: Designed to transmit large torques with minimal backlash and vibration.
Misalignment Compensation: Effectively handles angular and limited axial misalignments.
Drum Tooth Profile: Reduces stress concentration on teeth, improves contact area, and increases lifespan.
Smooth Transmission: Minimizes shock and torsional vibration, promoting smooth mechanical operation.
Grease Lubrication: Reduces maintenance intervals and ensures long-term reliable performance.
Customizable Design: Available in various bore sizes, keyway options, and materials upon request.

Typical Applications
The GIICL narrow type drum gear coupling is widely used in various heavy industrial applications where high torque and compact design are both required:
Rolling Mills and Metallurgical Equipment
Cement and Mining Machinery
Heavy-Duty Conveyors
Industrial Gearboxes
Pumps and Compressors
Paper Machines
Marine Drive Systems
Thermal Power Generation Equipment
It is particularly suitable for horizontal installations with limited space, frequent start-stop conditions, and fluctuating load scenarios.