Yamaha KN5-M1821-004 Robot Harmonic Drive Assembly

Description:

The Yamaha KN5-M1821-004 is a harmonic drive assembly used in Yamaha SCARA robot systems as a precision speed reduction unit for robotic joint motion, commonly installed in YK-series robots (X/R axis assemblies), and purchased by maintenance teams, OEMs, and integrators for replacement of worn reducers and restoration of accurate robotic positioning and torque transmission.

Applications:

The Yamaha KN5-M1821-004 harmonic drive is used in industrial automation environments where high precision, zero backlash, and compact torque transmission are required. It is commonly deployed in SCARA robots for pick-and-place systems, assembly lines, and semiconductor equipment where repeatability and smooth motion are critical. This unit specifically functions as a speed reduction gear within robot axes, enabling accurate positioning and controlled movement.

Technical Specifications:

• Manufacturer: Yamaha / Harmonic Drive type assembly
• Model: KN5-M1821-004
• Product Type: Harmonic drive assembly (strain wave gear reducer)
• Function: Speed reduction and torque multiplication
• Application: Yamaha SCARA robots (YK700X, YK800X, YK1000X R-axis series)
• Gear Type: Strain wave (flexspline/circular spline mechanism)
• Backlash: Near-zero (precision robotic motion)
• Design: Compact, high torque-to-size ratio
• Integration: Mounted within robot joint assembly
• Components: Wave generator, flexspline, circular spline
• Lubrication: Requires specified Yamaha grease for longevity
• Duty Cycle: Continuous industrial robotic operation
• Application Class: Robotics / semiconductor / precision automation
• Status: OEM robotic component / legacy support

Common Replacements:

• Yamaha KN5-M1821-001
• Yamaha KN4-M1821-007
• Harmonic Drive SHF-20-50 equivalent