Cyclo® Drives Speed Reducer

A history exceeding half a century

Since production started in 1939 the history of Cyclo® drives had been one of nurture by the requirements, trust and support of our customers.
Cyclo® drive is now "synonymous with reduction gears" and it is our mission to ensure that allmachinery keeps on moving correctly and safely.


Gear teeth that do not break

A curve plate is a component at the heart of a Cyclo® drive. Unlike involute gears, it features a unique smooth curvature (epitrochoid parallel curve). Furthermore, the unique circular teeth have also been adopted for the internal gears. A smooth rolling contact has been achieved with no damage to the teeth. Gaining a high reduction gear ratio with lower gears, in other words accomplishing both a high efficiency and a high reduction gear ratio, has been made possible.

Cyclo® drives feature a smooth rolling contact

Involute gears feature a sliding contact with smaller engagement ratios

Perfect after sales service system

At the SHI Group we believe it is our mission to ensure that our customers use our reduction gears with long term peace of mind.
In order to make this possible we provide repair and maintenance services promptly and with attention to detail, based on service sites (40 locations) networked throughout Japan.

Assortment of products

Take the direct motor drive type for example. Its capacity ranges between 0.1kW to 132kW and the reduction gear ratio has been standardized to between one-third to one-658503, with products delivered in a short time.Unlike ordinary gear motors, the service factor (margin of reduction gears in relation to motor ratings) can be selected freely, even with identical capacities and identical reduction gear ratios. Furthermore, the most suitable unit for a particular purpose can be selected from an overwhelming assortment of products available, including the F series of products for precision controls that feature a built in torque limiter, motor pulley, servo motor direct drive, and robots, etc.

International development

Various sites (production, assembly, hub, etc.) have been established in 50 countries around the world, including sales offices at 250 locations, in order to support the global business operations of our customers. Reliable sales and service activities are provided in Japan and around the world.

Sumitomo Drive Technologies deliver "Common global standards for quality and performance".

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Products & Solutions

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