ZS, ZSH, ZSSH Series Cylindrical Gear Reducers Ratio Range (i): Very wide range, typically from 10 to 500

I. Product Introduction

The ZS, ZSH, and ZSSH series are involute cylindrical gear, three-stage, horizontally mounted reducers. This is a traditional and extremely widely used standard reducer series, designed in accordance with the Chinese Machinery Industry Standard JB/T 8853-2001.

• ZS Series: Three-stage reduction, all stages use helical gears. This is the basic model.

• ZSH Series: Three-stage reduction, with the first stage helical and the second and third stages spur gears (H likely denotes mixed gearing). This is an economical variant.

• ZSSH Series: Three-stage reduction, with the first and second stages helical and the third stage spur gear (SSH denotes double-helical, single-spur). Its performance is between ZS and ZSH.

This series typically features soft-faced or medium-hardened gears (primarily soft-faced in earlier designs) and uses a expanded layout structure. Known for simple structure, low cost, and easy maintenance, it has been the workhorse of power transmission in many traditional industries.

II. Main Technical Parameters

1. Model Designation: ZS XXX - XX - XX, ZSH XXX - XX - XX, ZSSH XXX - XX - XX (XXX represents the center distance in mm).

2. Center Distance (mm): Common sizes include: 150, 170, 190, 210, 230, 250, 280, 320, 360, 400, 450, 500, 560.

3. Number of Stages: All are three-stage reduction.

4. Ratio Range (i): Very wide range, typically from 10 to 500.

5. Input Power (kW): Covers a range from fractional kW to several hundred kW.

6. Output Torque (N·m): Ranges from several thousand N·m to hundreds of thousands of N·m.

7. Gear Type:

   • ZS: All Helical Gears

   • ZSH: Helical + Spur + Spur Gears

   • ZSSH: Helical + Helical + Spur Gear

8. Gear Hardness: Traditionally mostly soft-faced (HB ≤ 350), though modern variants may have medium-hardened gears (e.g., quenched & tempered + surface hardened, HRC 40-50).

9. Efficiency: Relatively lower efficiency due to the number of stages. Overall efficiency for soft-faced versions is typically 92% - 94%. The ZS series (all helical) is slightly more efficient than the ZSH series (more spur gears).

III. Key Advantages & Features

1. High Cost-Effectiveness: Simple structure and relatively mature manufacturing processes result in lower acquisition and maintenance costs compared to hard-faced reducers, making them the首选 for cost-driven applications.

2. Extremely Wide Ratio Range: Three-stage reduction allows for very high total ratios, meeting demands for low speed and high torque output.

3. Simple Structure & Easy Maintenance: The expanded layout makes the housing easy to disassemble and assemble. Components are easy to inspect and replace, requiring relatively lower skill levels for maintenance.

4. Mature Application Technology: Boasts the longest history and widest range of application cases, with extensive experience in selection, installation, and use.

5. Multiple Options: ZS, ZSH, ZSSH offer flexibility in choosing between performance (smoothness, noise) and cost. ZS offers the best performance, ZSH the best economy, and ZSSH a compromise.

IV. Primary Application Fields

This series is the "standard configuration" for many traditional industrial machines, widely used in:

• Conveying Equipment: Drive unit for belt conveyors, drag chain conveyors, screw conveyors.

• General Machinery: Drive systems for wire drawing machines, winders, packaging machinery and other light industrial machinery.

• Building Materials Industry: Drive for small mixers, feeders.

• Mining & Metallurgy: Drives for some auxiliary equipment, such as feeders, small rolling mills.

• Chemical Equipment: Some low-speed mixing equipment.

• Any application where cost sensitivity is high, speed is low, torque requirements are moderate, and noise/size are not primary concerns.

Note: In applications requiring high load capacity, high efficiency, compact size, and long life, this series is gradually being replaced by hard-faced cylindrical gear reducers like ZSY, ZLY, and ZFY.