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

The MHI HASEG TRDB P Series (Double-Stage Type) Planetary Traction Drive Units are high-precision, dual-stage transmission systems that combine the benefits of ultra-high reduction ratios, smooth torque transmission, and zero-backlash performance. Built on MHI HASEG’s proprietary TR DRIVE rolling contact technology, the double-stage P Series delivers exceptional efficiency and stability across a wide range of motion control and automation applications.

Key Features

• ✅ Double-Stage Precision Traction Mechanism
  
  This model utilizes two sets of planetary roller systems, enabling higher reduction ratios while preserving compactness and rotational accuracy.
  
  

• ✅ Ultra-Low Backlash and High Torsional Rigidity
  
  Like all TR DRIVE units, the double-stage P Series provides practically zero backlash, making it ideal for high-precision servo motor control and indexing.
  
  

• ✅ Exceptional Rotational Accuracy
  
  With a rotational transmission error as low as 0.05% per revolution, this unit ensures extremely precise positioning even in dynamic motion profiles.
  
  

• ✅ Low Noise and Vibration
  
  Thanks to its rolling contact and elastic ring structure, the P Series double-stage unit achieves quiet and vibration-free operation—critical for cleanroom, medical, and semiconductor environments.
  
  

• ✅ High Efficiency in Multi-Stage Configuration
  
  Even as a double-stage reducer, the unit maintains efficiency rates up to 96–97%, thanks to precise roller preload control and oil-film based power transmission.
  
  

Technical Highlights

• Transmission Type: Dual-stage planetary traction drive

• Reduction Ratios: Nominal i = 31.5, 40, 50, 63, 80

• Efficiency: Up to 97%

• Backlash: Practically zero

• Noise/Vibration: Extremely low across full torque range

• Lubrication: Oil bath (lubricant specified by MHI HASEG)
  
  

Applications

The TRDB P Series (Double-Stage Type) is especially suitable for:

• Semiconductor handling and inspection systems

• Robotic arms and multi-axis positioning tables

• Laser marking and high-precision engraving machines

• Printing and photoengraving systems

• Reverse roll and gravure coating machines

• Medical imaging and diagnostics equipment
  
  

Typical Model Example

TRDB80H-31.5RZ

• TRDB: Planetary traction drive unit

• 80: Frame size

• 2: P Series double-stage

• 31.5: Reduction ratio

• R: Horizontal mount

• X: High precision, non-backlash design
  
  

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

•  High reduction ratios in a compact footprint

•  Designed for advanced servo-driven systems

•  Whisper-quiet and ultra-smooth torque delivery

•  Engineered for dynamic positioning and high-speed indexing

•  Trusted in high-tech industries with global patents

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