ZFY Series Hard-Faced Cylindrical Gear Reducer ultra-low output speed and ultra-high output torque

I. Product Introduction

The ZFY series reducer is a parallel shaft, hard-faced, four-stage reduction cylindrical gear reducer. It is an extension of the ZLY (two-stage) and ZSY (three-stage) series, designed to meet the demand for ultra-low output speed and ultra-high output torque. This series complies with the Chinese Machinery Industry Standard JB/T 8853-2001 (same as ZSY and ZLY). Its gears are made from high-quality alloy steel and undergo precision processes like case carburizing, quenching, and grinding, resulting in extremely high load capacity, transmission accuracy, and service life. The ZFY series represents the top-tier solution in the field of ultra-high ratio general-purpose cylindrical gear reducers.

II. Main Technical Parameters

1. Model Designation: ZFY XXX - XX - XX (XXX represents the center distance in mm).

2. Center Distance (mm): Common sizes include: 280, 320, 360, 400, 450, 500, 560, 630, 710. Center distances are typically large to withstand the enormous output torque.

3. Number of Stages: Four-stage reduction. This is its most distinctive feature, achieving an extremely high total ratio through four gear pairs.

4. Ratio Range (i): Extremely wide range, typically from 100 to 1000+.

5. Input Power (kW): Covers a range from tens of kW to over 1000 kW.

6. Output Torque (N·m): Provides extremely high output torque, reaching millions of Newton-meters, making it a true ultra-heavy-duty reducer.

7. Gear Accuracy: Extremely high gear precision, typically achieving Grade 6 or better per GB/T 10095.1-2008 (comparable to ISO 1328).

8. Gear Material: Gears are made from high-quality alloy steel (e.g., 20CrMnTi, 17CrNiMo6, 42CrMo), treated by case carburizing, quenching, and grinding. Tooth surface hardness reaches HRC 58-62.

9. Efficiency: Efficiency is lower than reducers with fewer stages due to more meshing points. However, the hard-faced grinding process ensures high per-stage efficiency (>98%). Overall efficiency is typically 92% - 95%.

III. Key Advantages & Features

1. Ultra-High Ratio & Torque: The four-stage reduction structure is its core advantage, providing ultra-low output speed and ultra-high output torque that cannot be achieved by single, double, or triple-stage reducers.

2. High Load Capacity: Hard-faced technology and gear grinding provide extremely high contact and bending strength, capable of handling extremely severe loads.

3. Compact Structure (Relatively): Although it is a large unit itself, compared to traditional solutions using a "three-stage reducer + an additional open gear stage", the ZFY integrates four stages into one housing, offering a more compact structure and easier maintenance.

4. Smooth Transmission & High Reliability: All gears are helical or herringbone, providing high contact ratio, smooth operation, low vibration and noise, and exceptionally high reliability.

5. Long Service Life: Premium materials, advanced heat treatment, and manufacturing processes ensure a very long service life under harsh operating conditions.

6. Strong Design Commonality: As an extension of the ZLY/ZSY series, it boasts a high degree of modularity and parts commonality.

IV. Primary Application Fields

The ZFY series reducer is designed for extreme heavy-duty applications requiring ultra-low speed and massive torque:

• Mining & Metallurgy: Main drive for large ball mills, rod mills, and rotary kilns. This is its most classic application.

• Ports & Terminals: Drive for the boom conveyor and slewing mechanism of large stackers and reclaimers.

• Building Materials Industry: Drive for large tube mills, cement mills, and raw material mills.

• Paper Industry: Power transmission for giant drums (Yankee cylinders), pulpers, etc.

• Shipbuilding & Heavy Industry: Drive for marine winches, windlasses, and large thruster transmissions.

• Water Conservancy Projects: Drive for giant gate hoists.

• Any application requiring ultra-heavy-duty transmission with speeds below 10 rpm and output torque in the millions of Newton-meters.