Harmonic Drive Gearbox

Strain Wave Harmonic Drive Gearbox Working Principle

Assunmotor's harmonic drive gearbox is engineered for precision, efficiency, and compact performance. Unlike conventional gear systems, it uses a flexible strain wave mechanism that enables high torque transmission, zero backlash, and exceptional positioning accuracy. This technology ensures smooth motion control, making it ideal for robotics, automation, and semiconductor industries.

The gearbox consists of three core components: the wave generator, flex spline, and circular spline, working together to achieve high reduction ratios in a lightweight and space-saving design. With its innovative engineering and durable construction, Assunmotor’s harmonic drive solutions provide reliable and precise motion control for demanding applications.

How Does a Harmonic Drive Work?

A harmonic drive system consists of three main components:

• Wave Generator – An elliptical cam enclosed in a flexible bearing that deforms the flexspline.
• Flexspline – A thin-walled, flexible gear that adapts to the motion of the wave generator.
• Circular Spline – A rigid outer ring with internal teeth that engage with the flexspline.

When the wave generator rotates, it deforms the flexspline, causing it to mesh with the circular spline in a specific pattern, achieving precise motion control with a high reduction ratio in a single stage.

Components of Harmonic Drive Gearboxes

1. Wave Generator

The Wave Generator is a key component that drives the motion of a harmonic gearbox. It consists of a specially designed ball bearing fitted onto an elliptical hub. When connected to the motor shaft, it acts as a high-efficiency torque converter, shaping the movement of the gearbox.

2. Flexspline

The Flexspline is a lightweight, cylindrical component made from high-strength alloy steel. It features external teeth on its open end and has the flexibility to adapt to the shape of the wave generator. While it is flexible radially, it remains stiff in the torsional direction. When the wave generator is inserted, the flexspline takes on an elliptical shape, transmitting power from the input to the output. The Flexspline is responsible for delivering rotational motion to the output flange.

3. Circular Spline

The Circular Spline is a rigid, internally toothed ring that works in conjunction with the flexspline. When the gearbox is assembled, the circular spline meshes with the flexspline's teeth along the major axis of the wave generator’s elliptical shape. It contains two additional teeth compared to the flexspline and remains fixed to the gear housing, ensuring precise motion control.

Key Advantages of Assun Motor's Harmonic Drive Gearboxes

Our harmonic drive gearboxes are engineered for performance, efficiency, and durability, offering:

• Zero Backlash – Ensures high-precision positioning and repeatability.
• High Torque Capacity – Delivers superior output in a compact design.
• Compact & Lightweight – Ideal for applications where space is limited.
• High Efficiency – Smooth and accurate power transmission with minimal energy loss.
• Minimal Wear & Tear – Designed for durability and long-term use.

Applications of Harmonic Drive Gearboxes

Assun Motor’s harmonic drive gearboxes are widely used across multiple industries due to their precision and reliability:

• Robotics & Automation – Enables smooth and precise movement in robotic arms and automation systems.
• Semiconductor Manufacturing – Essential for accurate positioning in semiconductor processing machines.
• Aerospace & Defense – Used in satellite positioning systems and high-precision instruments.
• Medical Equipment – Plays a crucial role in surgical robots and diagnostic machines.
• Optical & Photographic Systems – Provides controlled motion for high-precision optical devices.

Why Choose Assun Motor’s Harmonic Drive Gearboxes?

At Assun Motor, we specialize in delivering high-performance, precision-engineered harmonic drive gearboxes. Our expertise ensures top-tier quality, exceptional durability, and cutting-edge technology.

• Customizable Solutions – We offer tailored solutions based on your industry requirements.
• Stringent Quality Control – Each gearbox undergoes rigorous testing for reliability and precision.
• Expert Support – Our team provides in-depth consultation and technical support.