MHI HASEG Planetary Traction Drive Units TRDB P Series (Triple-Stage Type)

The MHI HASEG TRDB P Series (Triple-Stage Type) Planetary Traction Drive Units are engineered for applications requiring ultra-high reduction ratios, zero backlash, and extremely smooth, quiet torque transmission. Built with MHI HASEG’s patented TR DRIVE rolling contact mechanism, the triple-stage configuration multiplies reduction performance while maintaining exceptional precision and durability.

Key Features

• ✅ Triple-Stage Ultra-Precision Design
  
  By integrating three traction stages, the unit achieves very high reduction ratios (typically 250:1 and above)—ideal for slow, controlled motion or large-torque servo applications.
  
  

• ✅ Non-Backlash Operation
  
  Using a multi-stage roller preload system with elastic rings, the TRDB P Series triple-stage design eliminates backlash and maintains stable, accurate motion in both rotational directions.
  
  

• ✅ Outstanding Rotational Accuracy
  
  The unit offers rotational transmission error as low as 0.05%, supporting high-precision control in critical applications such as medical equipment, metrology, and robotics.
  
  

• ✅ Low Noise & Vibration
  
  Designed for sensitive environments, the triple-stage P Series operates with minimal vibration and noise across all speeds and torque ranges—significantly quieter than gear-based systems.
  
  

• ✅ High Efficiency in Multi-Stage Design
  
  Despite its triple-stage structure, it maintains high mechanical efficiency (approx. 95–96%), thanks to optimized rolling traction and carefully regulated contact pressure.
  
  

Technical Highlights

• Type: Triple-stage planetary traction drive

• Reduction Ratios: Nominal i = 125, 250, 500

• Efficiency: 95–96%

• Backlash: Practically zero

• Rotational Precision: ±0.05% or better

• Lubrication: Oil bath (user-specified or pre-filled on request)

• Mounting Styles: Horizontal (H), Vertical (V/W)
  
  

Typical Applications

The TRDB P Series (Triple-Stage Type) is ideal for:

• Semiconductor wafer and mask alignment systems

• Precision robotics and actuator systems

• Ultra-slow drive test benches and inspection units

• Optical equipment and metrology machines

• Gravure and high-density coating systems

• Laser etching and medical scanning systems
  
  

Model Example

TRDB160P-500RX

• TRDB: Planetary traction drive

• 160: Frame size

• P: Triple-stage P Series

• 500: Nominal reduction ratio

• R: Horizontal mount

• X: High-precision, backlash-free version
  
  

Why Choose TRDB P Series (Triple-Stage Type)?

•  Triple-stage design for ultra-high reductions

•  Unmatched backlash-free control for servo systems

•  Exceptionally quiet, smooth, and efficient operation

•  Built for compact integration in precision machinery

•  Globally patented traction technology by MHI HASEG

MHI HASEG Planetary Traction Drive Units: TRDB P Series（Triple-Stage Type）