English
QY series gear reducers are specialized hardened-tooth surface cylindrical gear reducers designed primarily for use in cranes and hoists. They are engineered to handle high-load, high-precision operations, these reducers are widely applied in industries like construction, ports, steel mills, metallurgy, mining, and manufacturing.
QY3S and QY3D Nominal transmission ratio & Actual transmission ratio
QY4S、QY34S and QY4D QY34D Nominal transmission ratio & Actual transmission ratio
QY4S
QY3D
QY4D
QY34S
QY34D
High Load Capacity: Made of high-strength alloy steel, carburized, quenched, and ground, this gearbox boasts a load capacity 2-4 times greater than reducers with soft or medium-hard gear surfaces, making it suitable for heavy-duty cranes (up to 550 tons).
Long Life and Durability: High-precision gear machining (GB/T 10095-88 Grade 6) and wear-resistant materials extend service life and reduce maintenance frequency, making it suitable for high-load environments such as ports and steel mills.
Efficient Transmission: Each gear stage boasts an efficiency of 0.98, minimizing energy loss and optimizing power transmission for lifting, traveling, and rotating mechanisms.
Low Noise and Vibration:The multi-stage design reduces single-stage ratios, increases center distance, reduces vibration and noise, and improves operator comfort and equipment stability.
Compact and Lightweight Design:Small size, low height, and low weight make it suitable for space-constrained applications such as electric hoists and trolleys.
1. What is a QY type gear reducer?
A QY series reducer is a universal hard-tooth-surface gear reducer optimized for crane and hoist applications. It features high-precision helical or cylindrical gears made from alloy steel, processed via carburizing, quenching, and grinding to achieve GB/T 10095-88 accuracy level 6. The series includes QYS (three-point suspension) and QYD (base-mounted) types, providing coaxial input/output for vertical installation in hoisting systems.
2. What are the key features and advantages of QY reducers?
Compact and lightweight design: Small size with high load capacity, ideal for space-constrained hoist setups.
High efficiency: Up to 98% per stage, with smooth operation and low noise/vibration.
Durability: Long service life due to hardened gears; handles heavy loads in demanding environments.
Versatility: Flexible mounting options (foot, three-pivot) and easy disassembly/installation.
Reliability: Low backlash, high torque output, and resistance to wear for frequent start/stop cycles in cranes.
3. What applications are QY reducers used for?
Primarily for crane hoists, including overhead cranes, gantry cranes, and mobile hoists. They are also suitable for transportation, metallurgy, mining, chemical processing, and light machinery where vertical speed reduction is needed. Common uses include winches, bucket elevators, and material handling systems requiring high torque at low speeds.
4. How do you install a QY type gear reducer?
Ensure coaxial alignment between the input shaft (from motor), reducer, and output (hoist drum).
Use vertical mounting for hoist applications; secure with three-point suspension (QYS) or pedestal base (QYD).
Apply anti-vibration mounting to a flat, sturdy base plate.
Lubricate with VG460 synthetic gear oil (or equivalent) if ambient temperature exceeds 30°C; maximum oil temperature is 100°C.
For heavy motors, add a supporting set to prevent shaft bending. Avoid over-tightening during assembly to prevent rust.
5. What lubrication is required for QY reducers?
Use high-viscosity synthetic gear oil (e.g., VG460) for temperatures above 30°C. Standard mineral oils suffice for milder conditions. Check oil levels regularly, as these reducers operate in high-load environments. Change oil after the initial 200–300 hours of operation, then every 1000–2000 hours. Ensure seals are intact to prevent leaks.
6. What maintenance is needed for QY hoist gear reducers?
Daily: Inspect for unusual noise, vibration, or leaks.
Weekly: Check oil levels and temperature (should not exceed 100°C).
Monthly: Verify gear alignment and bolt tightness; clean external surfaces.
Annually: Full disassembly for gear inspection, tooth wear measurement, and re-lubrication.
Service life can exceed 10,000 hours with proper care. Address radial loads promptly to avoid bearing failure.
7. What are common troubleshooting issues with QY reducers?
Overheating: Caused by overload or insufficient lubrication; reduce load or check oil viscosity.
Noise/Vibration: Misalignment or worn gears; realign shafts or inspect for backlash.
Reduced Efficiency: Dirty oil or seal failure; flush and replace oil/seals.
Failure to Engage: Backstop issues (if equipped) or input speed exceeding 1500 RPM; verify motor compatibility. Consult manufacturer guidelines for warranty-covered repairs.
