A gear machine comprises a housing, at least two gearwheels positioned within the housing, and a bearing body defining a circular-cylindrical outer surface segment and a bearing bore. The traction drive system of this embodiment also comprises an inner ring rotatable about the longitudinal axis adapted to contact the inner contact surface of each of the planet rollers, and a case ring adapted to contact the case contact surface of each of the planet rollers. In addition, the method may include etching the semiconductor layer to form a trench extending through the isolation structure and at least part of the semiconductor layer. When the lower portion is pivoted away from the upper portion, the vortex is interrupted.