How Does a Sumitomo Cycloidal Gearbox Work?

A Sumitomo cycloidal gearbox, also known as a cyclo drive, is a mechanical device that utilizes the principles of cycloidal motion to transmit high torque at low speeds. This gearbox is widely used in various industries due to its unique design, high efficiency, and durability.

The Operating Principle of a Sumitomo Cycloidal Gearbox

The Sumitomo Cycloidal Gearbox operates on the principle of cycloidal motion. This unique gearbox design offers high efficiency and excellent torque transmission with a compact footprint. Here’s how it works:

  1. Cycloidal Discs: At the core of the gearbox are one or more cycloidal discs. These discs have lobes (cycloidal profiles) that are slightly off-center from the axis of rotation.
  2. Input Shaft and Eccentric Cam: The input shaft is connected to an eccentric cam. When the input shaft rotates, the eccentric cam also rotates, causing the cycloidal discs to follow an eccentric, cycloidal path.
  3. Output Shaft with Rollers: The output shaft contains a series of rollers or pins arranged in a circle. These rollers fit into the cycloidal discs. As the cycloidal discs rotate and wobble, their lobes engage with the rollers on the output shaft.
  4. Reduced Speed and Increased Torque: The cycloidal motion of the discs results in a significant reduction in rotational speed from the input shaft to the output shaft, while simultaneously increasing the torque. This is due to the large number of contact points between the discs and the rollers, which spreads the load and allows for high torque transmission.
  5. High Overload Resistance and Low Backlash: The design inherently provides high resistance to overload and minimal backlash. This is because the load is evenly distributed over multiple rollers and the contact points between the lobes and the rollers change continuously during operation.
  6. Compact and Robust Design: Cycloidal gearboxes are known for their compact and robust design. They can fit into tight spaces while providing high torque and withstanding harsh operating conditions.

Sumitomo’s cycloidal gearboxes are widely used in applications requiring precise motion control and high torque, such as robotics, material handling, and industrial automation. Their design makes them suitable for applications where durability, precision, and compactness are critical.

Key Components of a Sumitomo Cycloidal Gearbox

A Sumitomo Cycloidal Gearbox consists of several primary components. These include the high-speed input shaft, an eccentric cam, a cycloidal disc, and the output shaft. All these components work together to ensure effective power transmission.

High-Speed Input Shaft

The high-speed input shaft is connected to the power source. It transfers the power from the source to the eccentric cam.

Eccentric Cam

The eccentric cam is attached to the high-speed input shaft. It rotates as the input shaft turns, pushing the cycloidal disc into a series of specific movements.

Cycloidal Disc

The cycloidal disc is the heart of the gearbox. It follows a cycloidal path due to the rotation of the eccentric cam, which in turn moves the output shaft.

Output Shaft

The output shaft is connected to the cycloidal disc. It rotates at a slower speed but higher torque than the input shaft, providing the necessary power for the application.

Applications of Sumitomo Cycloidal Gearboxes

Sumitomo Cycloidal Gearboxes are used in a wide range of applications ranging from robotics to conveyors. Their high torque and low speed make them ideal for heavy-duty applications in various industries.

Why Choose Sumitomo Cycloidal Gearboxes?

Sumitomo Cycloidal Gearboxes are known for their durability, efficiency, and reliability. They offer unparalleled performance, making them the preferred choice for many applications.

About Ever-Power

Ever-Power is a leading provider of high-quality gearboxes, including Sumitomo Cycloidal Gearboxes. We are committed to providing our customers with products that meet the highest standards of quality, reliability, and durability.

At Ever-Power, we continually monitor the consumer market and customer needs for gearboxes and make technical adjustments accordingly. Our expertise in the field and innovative approach ensures that our customers always receive the best solutions for their requirements.


We offer customization and flexibility, ensuring that our customers’ unique needs are met. Our team is ready to respond to your messages within 24 hours, providing you with customized solutions based on your specific requirements. We welcome customers to provide custom drawings for a truly personalized experience.

Ever-Power takes pride in its certifications and compliance with industry standards. This commitment to quality is reflected in every product we offer, ensuring optimal performance and longevity.


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