Heavy-Duty Transmission: DJ-B & BJ-B Series Enlarged Bore Star Elastic Couplings

The DJ-B (also designated as BJ-B) Series Enlarged Bore Star-Shaped Elastic Coupling is engineered strictly in compliance with the industrial JB/T9147-2000 standard. Optimized for severe heavy-duty drive units, the DJ-B series shares the excellent damping DNA of standard XL/ML jaw couplings but features a specially re-engineered hub geometry designed to accommodate much larger shaft diameters (Enlarged Bores) without overscaling the overall coupling envelope. Forged from pure 45# carbon steel and paired with ultra-tough 98 ShA star elastomers, it delivers exceptional torque density and misalignment compensation for heavy industrial equipment.

Core Product Advantages

• Enlarged Shaft Bore Design: Specifically built for applications where motor or gearbox shafts have larger diameters. It delivers massive bore flexibility within a highly compact outer radius, reducing rotational inertia.

• Pure 45# Solid Steel Hubs: Machined from solid 45# round steel with zero casting defects, ensuring superior toughness, high yield strength, and massive resistance to structural deformation under sudden load spikes.

• 98 ShA High-Hardness Elastic Spider: Equipped with a premium 98 Shore A hardness elastomeric star element. This calibrated compound ensures maximum nominal torque ratings while acting as a structural shock absorber.

• Multi-Directional Arced Geometry: The specialized curved jaw interface enables the dual-hub mechanism to accept and correct significant installation misalignments (radial, angular, and axial) effortlessly.

• H7 Precision Keyway Bores: Internal shaft tunnels are CNC-turned to an H7 precision tolerance window and integrated with standard keyways, providing a rock-solid, non-slip mechanical lock.

• Anti-Corrosive Chemical Blackening: Finished with a professional thermal black oxide coating that shields the carbon steel components from humidity, grease, and rust in harsh outdoor environments.

• Heavy Engineering Standard: The ultimate drivetrain choice for high-stress setups including industrial hoists, lifts, construction machinery, and heavy fluid blending pumps.

Technical Specifications Table