ZFZ Series Medium-Hard Gear Reducer Flexible applicability with Horizontal (W), Vertical (L)

1. Introduction

The ZFZ series reducer is a parallel shaft, medium-hardened cylindrical gear reducer. It represents a significant achievement in the standardization and modular design of China's reducer industry, with its design typically conforming to national standards such as JB/T 8853-2001 (Cylindrical Gear Reducers). This series utilizes high-quality alloy steel forged gears, which are carburized, quenched (achieving a high tooth surface hardness of HRC 58-62), and precision ground. Its core design philosophy emphasizes high load capacity, high efficiency, low noise, and long service life, making it an extremely widely used universal component in modern industrial drives.

2. Key Parameters

• Models: Usually denoted by center distance and nominal transmission ratio. E.g., ZFZ-160, ZFZ-180, ZFZ-200, ZFZ-224, ZFZ-250, ZFZ-280, ZFZ-315, ZFZ-355 (the number represents the center distance or a size code).

• Transmission Stages: Primarily double and triple stage reduction.

• Ratio Range (i): Wide range. Double-stage typically from 8:1 to 50:1; triple-stage can reach 100:1 or higher.

• Center Distance (a): Covers sizes from 160mm to 710mm or larger, forming a complete serialized product line.

• Input Power: Ranges from a few kW to several thousand kW, meeting various power requirements.

• Output Torque: Provides output torque from thousands of N·m to hundreds of thousands of N·m.

• Gear Design:

  • Tooth Profile: Involute cylindrical gears, with profile modification for smooth meshing.

  • Surface Hardness: Hardened (HRC 58-62), combining a tough core with an extremely hard, wear and impact-resistant surface.

  • Precision: High gear precision, usually up to Grade 6 per GB/T10095.

• Mounting Position: Flexible applicability with Horizontal (W), Vertical (L), and other mounting forms.

• Lubrication: Usually splash lubrication (natural cooling). Larger power models can be equipped with cooling devices (fans, water-cooling coils) or forced lubrication systems.

3. Product Advantages

• Standardization & High Universality: Strict adherence to national standards ensures good interchangeability between products from different manufacturers, facilitating procurement and maintenance.

• High Load Capacity: The hardened gear design results in a compact size and light weight, while the load capacity per unit volume is much higher than that of soft-gear reducers.

• High Transmission Efficiency: High efficiency per stage (≥98% single, ≥97% double, ≥96% triple), leading to significant energy savings.

• Smooth Operation & Low Noise: Precision gear grinding and scientific housing structure design ensure low vibration and quiet operation.

• Long Service Life: Excellent resistance to pitting and wear ensures a service life of over 10 years with proper maintenance.

• Easy Maintenance: The rational housing design simplifies maintenance tasks such as hoisting, inspection, and oil changes.

4. Typical Applications

The ZFZ series is a truly "universal" reducer, with applications covering almost all industrial sectors requiring power transmission.

• Material Handling: Belt conveyors, bucket elevators, screw conveyors, scraper conveyors.

• Lifting & Transportation: Hoisting and travel mechanisms of overhead/gantry cranes, port ship loaders/unloaders, stackers and reclaimers.

• Metallurgy & Mining: Auxiliary drives for steel rolling equipment, straighteners, wire drawing machines, mine hoists, crushers.

• Building Materials & Chemicals: Ball mills, rotary kilns, agitators, extruders.

• Light Industry & Paper: Paper machinery, printing machinery, food processing machinery.