Internal magnetic control device, flywheel assembly and fitness equipment

A flywheel assembly, comprising:

• a flywheel having a flywheel disc, a flywheel ring and a flywheel space, wherein the flywheel ring is integrally extended along a periphery of the flywheel disc and the flywheel ring are provided to surround the flywheel space;
• and
• an internal magnetic control device provided in the flywheel space, wherein the internal magnetic control device comprises a housing unit having a periphery opening, two swing arms, a driving unit for driving the two swing arms to swing respectively and two sets of magnetic elements, wherein the driving unit is provided at the housing unit, wherein the two swing arms are respectively arranged in the periphery opening and each of the two swing arms has a pivoting end and a driven end, wherein the pivoting end is pivotably mounted at the housing unit, the driven end is pivotably connected to the driving unit, so that each of the two swing arms is capable of being driven to swing with respect to the flywheel ring, wherein the two sets of the magnetic elements are arranged at the two swing arms to provide a magnetic field in the periphery opening and provided to swing synchronously with the two swinging arms, respectively, wherein the driving unit further comprise a driving motor, a driving ring and two connecting arms, wherein the driving ring is capable of being driven to rotate around a central axis, wherein one end of each of the connecting arms is pivotably mounted at the driving ring, and another end of each of the two connecting arms is pivotably mounted at the driven end of corresponding swing arm, wherein the driving ring is rotatably mounted at an output shaft of the driving motor so that the driving motor is capable of being driven to rotate around the central axis to drive the two swing arms to swing with respect the flywheel ring through the two connecting arms, respectively, wherein the driving unit further comprises a transmission gear assembly, the driving ring has a column of first ring teeth, wherein the transmission gear assembly comprises a plurality of gears engaged with each other in sequence, wherein one gear of the plurality of gears is engaged with the output shaft of the driving motor, another gear of the plurality of gears is engaged with the driving ring through the first ring teeth, wherein the driving unit further comprises at least one auxiliary gear, the driving ring has a column of second ring teeth, which the at least one auxiliary gear is rotatably engaged with the driving ring through the second ring teeth to ensure the driving ring stably and reliably to rotate around the center axis with respect to the housing unit.