Classic Three Stage External Large Ratio Cylindrical Gear Reducer Compact

Product Specification

ZQ Series Large Ratio Cylindrical Gear Reducer very high overall transmission ratio

Introduction

The ZQ series reducer is a classic three-stage external engagement involute cylindrical gear reducer. It is a typical representative of the "horizontal base-mounted" reducers, often found under designations like ZSC or ZQA series. This series is renowned for its very high overall transmission ratio, robust cast iron housing structure, and high load-bearing capacity. Its input and output shafts are vertically oriented (non-concentric, vertical), and its base-mounted design makes it an extremely common and cost-effective solution in conveying and lifting machinery.

Advantages 

1. Extra-Large Transmission Ratio: As a three-stage reducer, it offers a very wide range of overall transmission ratios, enabling low-speed high-torque output without additional reduction stages.

2. Compact Structure, Saves Space: Despite being a three-stage reducer, its design is relatively compact, especially when mounted vertically, resulting in a small footprint.

3. High Load Capacity & Durability: Gears are made of high-strength alloy steel, hardened and tempered. The cast iron housing provides sufficient rigidity and good damping properties, capable of withstanding harsh conditions and impact loads.

4. Versatility & Cost-Effectiveness: It is a highly mature and standardized product series, easy to source, offers good interchangeability, and has relatively low manufacturing costs, providing high value for money.

5. Easy Installation: Standardized base mounting hole design facilitates easy installation and commissioning on site.

Main Parameters

• Series Models: Usually indicated by center distance or specification number, e.g., ZQ350, ZQ400, ZQ500, ZQ650, ZQ750, ZQ850, ZQ1000 (the number often represents the final stage center distance or a size code).

• Transmission Ratio: Very wide range of overall ratios, typically from ~40:1 to 200:1, or even higher. Specific values depend on gear tooth combinations (e.g., 48.57, 50.41, 59.17, 60.17, 78.17).

• Input Power: Covers a wide range, from a few kW to over a hundred kW (e.g., ~5kW to 200kW+), depending on the size.

• Output Torque: High output torque, ranging from several thousand to hundreds of thousands of Newton-meters (e.g., ~4,000 Nm to 180,000 Nm+).

• Input Speed: Typically matched with standard 4-pole or 6-pole motors. Common input speeds are 1500 rpm or 1000 rpm.

• Mounting Form: Primarily base-mounted. The output shaft can be oriented vertically upwards or downwards.

Lubrication Method: Typically splash lubrication (oil bath lubrication).

Applications

The ZQ series reducer is a classic choice for achieving low-speed, heavy-duty, high-torque transmission in heavy industries, particularly widely used in:

• Lifting Machinery (Core Application): The gantry travel mechanism and trolley travel mechanism of overhead cranes and gantry cranes. This is its most classic application.

• Conveying Equipment: Drive units for belt conveyors, apron conveyors, and screw conveyors.

• Metallurgical & Mining Machinery: Auxiliary steel rolling equipment (e.g., cooling beds, pulling machines), mine hoists, feeders.

• Building Material Equipment: Drum dryers/mixers, mixing equipment, dischargers.

• Ports & Terminals: Travel mechanisms in ship unloaders, stackers, and reclaimers.