MHI HASEG Planetary Traction Drive Units TRDF S Series

The MHI HASEG TRDF S Series Planetary Traction Drive Units are compact, high-precision reducers designed for applications requiring ultra-smooth operation, minimal backlash, and high rotational accuracy. As a part of the acclaimed TR DRIVE product line, the S Series incorporates MHI HASEG’s patented rolling traction drive technology, offering superior control and efficiency in a space-saving configuration.

Key Features

• ✅ High Rotational Accuracy
  
  The TRDF S Series achieves exceptional precision with rotational transmission error as low as 0.05% per revolution, making it ideal for indexing and positioning systems.
  
  

• ✅ Ultra-Low Backlash
  
  The advanced roller mechanism and elastic ring structure ensure non-backlash transmission, delivering precise bidirectional motion without mechanical play.
  
  

• ✅ Compact & Lightweight Design
  
  The S Series is built for tight installation spaces, featuring small frame sizes (E25, E31.5, E40) and a lightweight aluminum body without compromising strength.
  
  

• ✅ Low Noise & Vibration
  
  The rolling contact design ensures silent and vibration-free operation, even at high speeds or under varying loads, making it suitable for sensitive environments.
  
  

• ✅ Pre-Filled Lubrication (S Series Exclusive)
  
  The TRDF S Series comes pre-filled with lubricating oil, simplifying installation and reducing initial setup time and risk of lubrication failure.
  
  

Construction & Mechanism

The TRDF S Series uses a roller-to-roller traction mechanism involving:

• Sun roller (central input)

• Planetary rollers

• Elastic ring with U-shaped cross-section
  
  

This configuration allows for smooth torque transmission through rolling contact, avoiding the sliding friction and gear meshing noise typical of conventional gear drives.

Specifications Overview

• Frame Sizes: E25, E31.5, E40

• Reduction Ratios: i = 5, 10, 25, 50, 100

• Input Speed (n₁): Max 3,000 rpm

• Efficiency: Up to 98%

• Torque Range: 0.05 Nm to 5.4 Nm (rated); max torque up to 11.2 Nm

• Backlash: Practically zero

• Noise Level: 2 μp-p at 1,800 rpm (no load)
  
  

Typical Applications

The TRDF S Series is ideal for precision-driven compact systems, such as:

• Semiconductor handling machines

• Engraving and photo-processing systems

• High-speed inspection equipment

• Medical instruments

• XY precision positioning tables

• Precision cutters and mini actuators
  
  

Model Example

TRDF25H-50RZ

• TRDF: TR Drive, planetary traction drive

• 25: Frame size

• H: Horizontal mounting

• 50: Reduction ratio (50:1)

• RZ: High-precision, standard type
  
  

Why Choose the TRDF S Series?

•  Compact, precise, and pre-lubricated for easy setup

•  Exceptionally quiet and low-vibration

•  Perfect for servo-driven applications requiring repeatable accuracy

•  Maintenance-friendly design with long service life

•  Patented in multiple countries for trusted performance

MHI HASEG Planetary Traction Drive Units: TRDF S Series（H: Horizontal）

MHI HASEG Planetary Traction Drive Units: TRDB S Series（V: Vertical ）

MHI HASEG Planetary Traction Drive Units: TRDB S Series（W: Vertical ）