The FHD Series harmonic reducer employs an ultra-short top-hat flexspline design, designed for applications demanding extreme compactness and lightweight performance.The FHD Combined Type pursues the ultimate flat-profile design. Compared to the FHG series, its axial length is reduced by approximately 50%. Equipped with high-rigidity cross roller bearings on the output side, it is ideally suited for applications requiring space-constrained designs.

The FSD series harmonic gear adopts an ultra-short cup-type flexspline structural design, achieving approximately 50% shorter axial length compared to the FSG series. It is specifically designed for applications requiring extreme compactness and weight reduction.
In recent years, emerging fields such as humanoid robots, aerospace systems, along with LCD panel and semiconductor manufacturing equipment, have been pursuing ultra-thin solutions under the strict spatial limitations of production line systems.
Building on the lightweight and compact features of harmonic gear transmissions, the FSD series meets market demands by retaining the proven performance of traditional products while implementing bold structural innovations.

The differential gear FDS series is divided into the combined type and the component type. The combined type aims to integrate the differential mechanism into a single unit for easy assembly into equipment, and its housing allows direct mounting of transmission gears, pulleys, etc. The component type pursues a flat and thin design, enabling customers to design their own encapsulation housing and optimize device space according to their structural requirements.
Utilizing Harmonic Drive's unique operating principle, it is an ultra-compact differential device capable of performing phase and timing fine-tuning during operation.
The combined type of the FDS series shares the same four core components as the pancake component type, except that the combined type includes additional front and rear sealing flanges and support bearings. The FDS series operates on the same working principle as the cup-type FSG series. The shape of the pancake flexspline is identical to the cross-section of the cup flexspline's base, and the wave generator bearings are arranged in two rows, with the tooth width of the circular spline and flexspline increased to handle higher torque capacity. Additionally, the pancake type incorporates an extra circular spline with the same number of teeth as the flexspline for connection to the output shaft.