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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.