Overview of ZOKECRANE Crane Coupling Systems
Manufactured by Henan Zoke Crane Co., Ltd., ZOKECRANE crane couplings are forged from high-tensile alloy steel (such as 42CrMo, 35CrMo, and 45# forged steel) and heat-treated to ensure maximum wear resistance and fatigue strength. Engineered in strict compliance with DIN, AGMA, ISO, and GB standards, our product lineup includes crowned gear couplings, flexible pin couplings, elastic spider couplings, drum couplings, and integrated brake drum/disc couplings for all types of industrial cranes.
Key Technical Specifications & Parameters
| Technical Parameter | Crane Coupling Specification |
|---|---|
| Product Type | Crowned Gear Coupling / Elastic Pin Coupling / Drum Coupling / Brake Drum Coupling |
| Nominal Torque Range | 800 N·m to 800,000+ N·m (Custom heavy-duty torque designs available) |
| Allowable Shaft Bore Diameter | Ø25 mm to Ø500+ mm (Keyway, spline, or shrink-fit options) |
| Manufacturing Material | Forged Alloy Steel: 42CrMo, 35CrMo, 45# forged steel, 60CrMoV |
| Allowable Angular Misalignment | Up to ±1.5° (Crowned tooth gear geometry design) |
| Special Features | Integrated brake drum / brake disc, heavy-duty O-ring grease sealing |
| Heat Treatment | Quenched & tempered, induction-hardened tooth surfaces (HRC 45–55) |
| Manufacturing Standard | DIN 740, AGMA 9008, ISO 10441, GB/T 6069, GB/T 5272 |
| Certifications & Compliance | ISO 9001 Quality System, CE Certified, SGS Verified |
Core Product Advantages & Engineering Features
- Crowned Gear Tooth Geometry: Features precision spherical gear teeth that optimize contact area, increase load capacity, and allow smooth power transmission under angular misalignment.
- High Torque & Impact Resistance: Forged monolithic alloy steel bodies withstand frequent motor reversals, heavy starting torque, and sudden braking forces without structural deformation.
- Integrated Brake Wheel Options: Available with integrated brake drums or brake discs, compacting the drive mechanism footprint and simplifying motor-reducer alignment.
- Superior Grease Sealing: Heavy-duty synthetic rubber O-rings retain lubricant internally while preventing ambient dust, steel scale, and moisture ingress.
Industrial Applications of Crane Couplings
ZOKECRANE heavy-duty shaft couplings are essential power transmission components utilized across diverse lifting machinery and industrial drive systems worldwide:
1. Overhead & Gantry Crane Hoisting Drives
Connects the main hoisting motor, hydraulic thruster brake, gearbox shaft, and rope drum in double girder trolleys and heavy winches.
2. Crane Travel & Bridge Drives
Transmits rotary power along long drive shafts connecting motor-reducers to crane end carriages and wheel block assemblies.
3. Metallurgical & Foundry Steel Mill Cranes
Heat-resistant forged gear couplings operating in high-temperature melt shops, ladle cranes, and heavy ingot handling equipment.
4. Port Marine Cranes & Heavy Mining Winches
Corrosion-resistant shaft couplings installed in ship-to-shore (STS) quay cranes, portal cranes, and heavy mining hoists.
Frequently Asked Questions (Product FAQs)
What is the difference between a Gear Coupling and a Flexible Pin Coupling for cranes?
Crowned Gear Couplings deliver ultra-high torque capacity and handle higher angular misalignments, making them the industry standard for main hoisting mechanisms and heavy-duty crane drives. Flexible Pin Couplings use elastomeric pins to absorb shock and vibration, suitable for medium-duty crane travel drives and motor connections.
Why is a crowned gear profile better than a straight gear tooth profile in crane couplings?
Straight gear teeth concentrate loads on the tooth edges when shafts are slightly misaligned, causing rapid wear and tooth breakage. Crowned gear teeth distribute contact pressure across the center of the tooth profile, accommodating up to 1.5 degrees of misalignment while increasing service life by up to 300%.
How often should crane gear couplings be lubricated?
Gear couplings require continuous grease lubrication to prevent metal-to-metal tooth wear. Under normal crane operation, grease should be inspected every 3 to 6 months and replenished using high-pressure lithium-base grease with EP (extreme pressure) additives.
Can ZOKECRANE supply replacement couplings according to old crane drawings?
Yes. Our engineering department can custom-machine replacement couplings directly from your original CAD drawings, shaft dimensions, keyway profiles, or worn sample parts for old cranes.
Export & Logistics FAQs for International Buyers
Which international markets does ZOKECRANE export crane couplings to?
ZOKECRANE power transmission components and crane parts are supplied globally, serving crane builders, gear motor integrators, and industrial users in Russia, Uzbekistan, the Philippines, Bangladesh, Australia, Qatar, Tanzania, Singapore, Saudi Arabia, Brazil, Nigeria, and many other international markets.
How are crane couplings packaged to prevent rust and damage during ocean freight?
All machined bores, teeth, keyways, and brake drum surfaces receive heavy anti-rust oil coatings and protective plastic wrapping. Complete coupling assemblies are vacuum-sealed in anti-corrosion film and packed in heavy-duty export-standard fumigated wooden cases.
What quality test reports and certifications accompany ZOKECRANE couplings?
Every shipment is accompanied by complete quality assurance documentation, including ISO 9001 compliance, European CE certificates, EN 10204 3.1 Material Test Reports (MTR), dynamic balancing certificates, tooth hardness inspection sheets, and SGS verification upon request.
What shipping terms and manufacturing lead times do you offer?
We support standard international commercial terms including FOB, CIF, CFR, DDU, and DDP. Standard coupling models (gear couplings, pin couplings) are kept in stock or semi-finished with fast lead times of 10 to 15 business days; custom heavy-tonnage or special bore size couplings take 20 to 30 business days.
Does ZOKECRANE provide technical support for coupling selection and installation?
Yes. Our engineering team assists buyers with torque calculations, dynamic factor selection, and shaft bore clearance matching. We also provide comprehensive installation manuals and 24/7 remote video technical support to ensure smooth mounting and alignment on site.