Boxin · Hengzhen · Botrust
Precision Manufacturing・Powering the World
CSF-25
The CSF-25 is a cup‑type standard harmonic drive with a maximum rated output torque of 60 N·m and a backlash as low as ≤20 arcsec. Featuring a harmonic transmission architecture and an integrated crossed roller bearing design, it delivers high precision, lightweight construction, and high torque density. It is widely used in joints of small to medium‑payload industrial robots, rotary tables for precision automation equipment, and other applications. A domestically produced compatible model is also available for cost‑effective substitution.
- Product Description
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I. Product Overview
The CSF-25 is a standard cup‑type harmonic reducer in the CSF series, serving as a core high‑precision transmission component for industrial robot joints, precision rotary tables, and other equipment. It is also one of the classic models in the field of harmonic drive technology, renowned for its exceptionally high positioning accuracy, compact and lightweight design, and high torque density.
II. Core Technical Parameters (using the mainstream CSF-25-100-2UH/2A model as an example)
Project Parameter value Model Series CSF-25 (Cup-Type Standard Harmonic Reducer) Standard reduction ratio 50 / 80 / 100 / 120 / 160 Rated Output Torque (Continuous) 39 N·m (gear ratio 50) / 60 N·m (gear ratio 100/120) Instantaneous maximum allowable torque 190 N·m (reduction ratio 100) Repetitive Peak Allowable Torque 100 N·m (reduction ratio 100) Allowable average input speed 3500 rpm Maximum permissible input speed 6000 rpm Backlash ≤ 20 arcseconds (for high-precision grade, ≤ 10 arcseconds) Transmission efficiency ≥ 80% (under rated operating conditions) Allowable overturning moment 156 N·m Standard weight Approximately 1.3–1.6 kg (varies slightly depending on the reduction ratio) External dimensions Flange diameter approximately 100 mm, overall length approximately 55–65 mm.
III. Structure and Core Features
- Classical cup-type harmonic drive structure
- It consists of three core components—the flexspline, the circular spline, and the wave generator—and leverages elastic deformation to achieve a high reduction ratio and high-precision transmission. It features backlash-free meshing, minimal backlash, and outstanding positioning accuracy.
- Integrated Cross-Roller Bearing Design
- The 2UH model is equipped with a high-rigidity cross-roller bearing that can directly withstand radial and axial loads as well as overturning moments, eliminating the need for additional support structures, thereby significantly simplifying equipment design and reducing installation costs.
- Lightweight, compact design
- Small in size and lightweight, with a wide transmission ratio range and high torque density, it is well suited for industrial robot joint applications where space and weight are critical, effectively reducing the equipment’s dead load.
- High rigidity and impact resistance
- The flexspline is made from a high-strength alloy and undergoes specialized heat treatment, providing excellent fatigue strength and impact resistance, making it well-suited for robotic joint applications involving frequent start–stop cycles.
- Long life, low maintenance
- The transmission components exhibit extremely low wear, eliminating the need for periodic backlash adjustments, resulting in low maintenance costs. With a design life exceeding 10,000 hours, it is well-suited to meet the demands of long-term automated operation.
IV. Typical Application Scenarios
- Industrial Robots: Small- and Medium-Sized Payload Articulated 6-Axis Industrial Robots (with payloads in the approximately 10–20 kg range)
- Precision Automation Equipment: High-Precision Rotary Mechanisms for CNC Turntables, Semiconductor Equipment, Optical Instruments, and Medical Devices
- Aerospace: Positioning and drive systems for satellite antennas, precision radars, and aviation equipment.
- Industrial Automation: Precision Drive Systems for Automated Production Lines, AGV Vehicles, and Packaging Equipment
V. Model Naming Conventions
Complete model format:
CSF-25-Reduction Ratio-Type-Additional CodeExample:
CSF-25-100-2UHCSF: Cup-type standard harmonic reducer series designation25: Specification code (corresponds to the gear pitch circle diameter and is related to torque and dimensions)100: Reduction ratio (optional: 50/80/100/120/160)2UH: Integrated bearing unit type (with built-in output support bearing, direct flange mounting);2AFor component-type (without bearings; users must design the supporting structure themselves)
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