ZDY Single-Stage Gear Reducer: Basic Parameters & Industrial Applications
ZDY single-stage industrial gearbox reducer: complete specifications and industrial applications
| Parameter | Typical Range |
| Center distance | 80–560 mm |
| Nominal ratio (i) | 1.25–6.3 (common engineering range 1.25–5.6) |
| Rated input power | 5–6,666 kW (series-dependent) |
| Output torque | 450–130,000 N·m |
| Input speed (max) | ≤1,500 rpm |
| Single-stage efficiency | ≥96.5% |
| Tooth surface hardness | HRC 58–62 (carburized, quenched, ground) |
| Operating temperature | −40 °C to +45 °C (preheat below 0 °C) |
| Governing standard | JB/T 8853-2001 |
1. What “ZDY” Actually Tells You About the Reducer
The model code is not arbitrary. In the ZDY designation:
Z = cylindrical gear ( 圆柱齿轮 )
D = single-stage ( 单级 )
Y = hard tooth surface ( 硬齿面）
A complete model string such as ZDY 280-5-I decodes as follows: center distance 280 mm, nominal ratio 5:1, and assembly form I. The center distance is the single most useful sizing dimension because it correlates directly with the load-bearing capacity of the housing and gear pair.
2. ZDY Performance Envelope: Power, Torque, and Ratio
The table below summarizes the relationship between ratio, input speed, and nominal power for representative ZDY frame sizes. Use it for first-pass screening, not final selection—thermal rating and service factor must be verified separately.
ZDY Nominal Input Power P₁ (kW) – Selected Frames and Ratios
| Ratio (i) | Input speed (r/min) | ZDY80 | ZDY125 | ZDY200 | ZDY280 | ZDY355 | ZDY450 |
| 1.25 | 1500 | 57 | 205 | 633 | |||
| 1.4 | 1500 | 53 | 194 | 616 | |||
| 1.6 | 1500 | 49 | 180 | 587 | 1,473 | 2,766 | |
| 2.0 | 1500 | 39 | 158 | 526 | 1,339 | 2,536 | 4,793 |
| 2.5 | 1500 | 32 | 127 | 447 | 1,154 | 2,264 | |
| 3.15 | 1000 | 19 | 77 | 271 | 701 | 1,377 | 2,605 |
| 4.0 | 1000 | 15 | 61 | 214 | 552 | 1,086 | 2,054 |
| 5.0 | 1000 | 12 | 48 | 169 | 438 | 862 | 1,630 |
| 6.3 | 750 | 9 | 36 | 127 | 328 | 646 | 1,221 |
Key engineering reading of the table:
Small frames (ZDY80–ZDY125) concentrate in low-power, low-torque duties—light conveyors, small agitators, and auxiliary drives.
Mid frames (ZDY200–ZDY355) cover the bulk of general industrial demand: 500–2,500 kW at ratios 1.6–5.0, matching belt conveyor head drives and bucket elevator service.
Large frames (ZDY450–ZDY560) are selected for high-power, moderate-ratio applications where a two-stage unit would be oversized in ratio but a single-stage is still viable.
Efficiency advantage. Single-stage ZDY efficiency is ≥96.5%, compared with ≥93% for two-stage and ≥90% for three-stage units. Over a 6,000-hour annual operating profile, that 3–6 percentage-point efficiency gap translates into measurable energy savings—a strong argument for ZDY when the required ratio falls within its range.
Please send your required power, output speed, torque and installation space drawing, our engineer will recommend the suitable gear model for you for free. CAD 2D / 3D STEP files available upon request.
Contact：Daniel
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