Stationary exercise apparatus for indoor cycling
The present disclosure relates to a stationary exercise apparatus for indoor cycle training ( 1 ), i.e. a stationary exercise bicycle, preferably provided with a magnetic resistance unit ( 15 ). One embodiment relates to a stationary exercise bike comprising a flywheel ( 10 ) defining a radial gap ( 25 ) in the periphery wherein at least the periphery of the flywheel ( 10 ) has ferromagnetic properties, and wherein a magnetic resistance unit ( 15 ) is configured to controllably insert one, two or more magnets into said radial gap.
1. A stationary exercise bike comprising: a lower frame housing a flywheel drivable by a rotatable crankshaft, wherein the flywheel comprises two parallel plates mounted in parallel on a flywheel shaft with a distance there between thereby forming a radial gap, and wherein each parallel plate comprises one or more rings mounted near a periphery of the parallel plates, and wherein the one or more rings have at least one of conductive or ferromagnetic properties.
2. The stationary exercise bike according to claim 1 , wherein at least a periphery of the flywheel has one or more of conductive or ferromagnetic properties, and wherein a magnetic resistance unit is configured to controllably insert one or more magnets into the radial gap.
3. The stationary exercise bike according to claim 1 , wherein the two parallel plates are metallic plates.
4. The stationary exercise bike according to claim 1 , wherein the one or more rings comprise a material with ferromagnetic properties.
5. The stationary exercise bike according to claim 4 , wherein the one or more rings are comprised of steel.
6. The stationary exercise bike according to claim 1 , wherein the one or more rings have stronger ferromagnetic properties than the parallel plates.
7. The stationary exercise bike according to claim 1 , wherein each of the parallel plates has a width and an outside facing away from the radial gap, wherein the one or more rings are attached on each outside and, wherein one or more magnets is positioned in the gap such that the width separates the one or more magnets from the one or more rings.
8. The stationary exercise bike according to claim 7 , wherein the one or more magnets are permanent magnets.
9. The stationary exercise bike according to claim 8 , wherein the permanent magnets are rare-earth magnets.
10. The stationary exercise bike according to claim 8 , wherein the permanent magnets are neodymium magnets.
11. The stationary exercise bike according to claim 1 , wherein the flywheel comprises a first driving wheel, and wherein the radial gap is located centrally in the periphery of the flywheel and extends to the first driving wheel, the stationary exercise bike further comprising:
a pedaling unit having a second driving wheel displaced from and parallel to the first driving wheel; and
a driving element connecting the first and second driving wheels through the radial gap in the flywheel.
12. The stationary exercise bike according to claim 11 , wherein the first driving wheel has between 10-20 teeth and the second driving wheel has between 60-110 teeth for providing a gearing between the first driving wheel and the second driving wheel that is one or more of at least 3, at least 4, or at least 5.
13. The stationary exercise bike according to claim 11 , wherein the first driving wheel is a gearwheel or the second driving wheel is a gearwheel.
14. The stationary exercise bike according to claim 11 , wherein the driving element is an endless belt.
15. The stationary exercise bike according to claim 14 , further comprising a magnet holder comprising two contact surfaces on opposite sides of a plate, each contact surface formed to hold a predefined permanent magnet, the plate formed such that the permanent magnets attract each other when mounted in the magnet holder.
16. The stationary exercise bike according to claim 15 , further comprising a magnetic resistance unit configured to controllably insert one or more magnets into the radial gap and a step motor, wherein the step motor and the magnetic resistance unit are configured such that each step of the step motor corresponds to less than 0.05 mm, 0.04 mm, or 0.03 mm of linear translation of the magnet holder.
17. The stationary exercise bike according to claim 1 , further comprising:
a pedaling unit wherein the crankshaft is mounted in a freewheeling mechanism; and
a driving element connecting the flywheel and the crankshaft such that the crankshaft is separated from the flywheel shaft, such that the flywheel can be driven in a freewheel arrangement where the freewheeling mechanism is provided in the crankshaft by a freewheel bearing between a front toothed wheel and the crankshaft.
18. The stationary exercise bike according to claim 1 , further comprising an upper frame comprising a seat post for attaching a saddle and a head tube for attaching a handlebar, wherein the upper frame is detachable from the lower frame such that different types of upper frames with different configurations of the seat post and head tube can be attached to the lower frame.
19. The stationary exercise bike according to claim 1 , wherein the two parallel plates are aluminum plates.
20. A stationary exercise bike comprising: a lower frame housing a flywheel drivable by a rotatable crankshaft, the flywheel having a radial gap between outer surfaces of the flywheel, wherein at least a periphery of the flywheel has conductive or ferromagnetic properties, and wherein a magnetic resistance unit is configured to controllably insert one or more magnets into the radial gap, wherein the magnetic resistance unit comprises a stepper motor, a threaded guide bolt, a slide seat, and a magnet holder for holding the one or more magnets, such that the magnet holder can be translated inside the radial gap of the flywheel in a linear fashion.