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Heavy-Duty Drum Gear Coupling | Crowned Tooth Design · Angular Misalignment 1.5° · AGMA Interchangea
Drum gear couplings are particularly suitable for low-speed, heavy-load conditions and are widely used in shaft transmissions for metallurgy, mining, crane transport, petroleum, chemical, and general machinery.
Core Design Advantages:
Higher load capacity: 15–20% higher than straight-tooth couplings at same outer diameter
Greater angular misalignment compensation: Up to 1°30', 50% better than straight-tooth types
Superior contact conditions: Crowned tooth profile improves contact, eliminates edge loading and stress concentration found in straight teeth under angular misalignment
Transmission efficiency: Up to 99.7%
Easy assembly/disassembly: Bell-mouthed tooth ends on outer sleeve
Crowned tooth refers to a tooth profile with curved tooth trace in the working cross-section, improving contact conditions. ISO standard crowning amount: 10–40μm.
Manufacturing Methods:
Tooth modification method: Gear blank rotates while moving forward/backward relative to tool; hob feeds vertically
Envelope machining method (currently more common): Gear blank only rotates; hob center moves in arc for vertical and horizontal feeds
Process Route: Forged blank → normalizing → rough turning → semi-finish turning → gear hobbing (crowned tooth tooling) → carburizing + hardening → finish turning → gear grinding → tooth profile inspection (CMM/gear tester) → assembly → dynamic balancing.
Material: 42CrMo or 45# carbon steel forgings, tooth surface HRC 58–62, core HRC 30–35.
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