English
The BWD Series is a popular model within the cycloidal pinwheel (or cycloidal pin gear) speed reducer family, commonly used in industrial applications for precise speed reduction and torque multiplication. These reducers operate on the principle of planetary transmission with cycloidal meshing, where an input shaft drives an eccentric cam that causes a cycloidal disc to roll and engage with fixed pins, producing smooth, high-ratio reduction in a compact form. The "BWD" designation typically refers to a horizontal foot-mounted configuration with a double shaft output and standard motor coupling, distinguishing it from variants like BLD (flange-mounted vertical) or BW (single shaft).
| Item | Parameters |
| Power | 0.12-90kW |
| Speed Ratio | 7-650000 |
| Maximum Output Torque(kN.m) | 30kN.m |
Compact and Lightweight: Achieves high ratios in a small footprint, ideal for space-constrained setups.
High Shock Load Capacity: Can handle overloads 5–10 times rated torque without damage, thanks to distributed contact points.
Low Noise and Vibration: Smooth cycloidal motion results in quiet operation (<70 dB typical).
Long Service Life: Reduced wear from rolling (not sliding) contact; often 10,000+ hours with proper lubrication.
Versatile: Handles harsh environments; available in hardened tooth surface for durability.
1. What is the BWD series cycloidal pinwheel speed reducer?
The BWD series is a horizontal, foot-mounted cycloidal reducer with direct-coupled ordinary motor. It features a novel structure using planetary transmission and cycloidal pinwheel meshing, replacing traditional cylindrical or worm gear reducers in many cases. It's compact, with high efficiency (up to 93% in single-stage) and low backlash, ideal for applications requiring high torque in limited space.
2. What are the main advantages of the BWD series over other reducers?
Compact Size: Achieves high ratios (up to 300:1 in a single stage) without multiple gear stages, making it smaller and lighter than helical or planetary alternatives.
Low Noise and Vibration: More meshed teeth and high overlap coefficient ensure smooth, stable operation with minimal noise.
High Durability: Rolling contact (not sliding) reduces wear; main parts use high-carbon chrome steel for long service life.
Low Backlash: Approaches zero, ideal for precision applications like robotics or conveyors.
Shock Resistance: Handles overloads 3–5 times rated torque without damage, outperforming spur gear planetaries (typically 250%).
3. What applications is the BWD series suitable for?
Commonly used in mining, metallurgy, chemicals, environmental protection, paper making, printing, lifting/transport, food processing, textiles, and pharmaceuticals. It's also applied in electric vehicles, marine equipment, agricultural machinery, and automation systems requiring reliable speed reduction and torque multiplication.
4. How does the BWD series achieve speed reduction?
The input shaft drives an eccentric cam, causing the cycloidal disc to wobble eccentrically inside a ring-gear housing with fixed pins. The disc's lobes (one fewer than pins) mesh with the pins, creating a hypocycloid path. Output pins in the disc holes transfer motion to the output shaft at reduced speed. The ratio is calculated as: Reduction = (Number of pins) / (Number of disc lobes).
