Bicycle trainer
A bicycle trainer including folding legs and a vertically adjustable frame member supporting an axle and cassette where a rider mounts the rear frame, such as dropouts, of a conventional bicycle with the rear wheel removed. The trainer includes a flywheel with a magnetic brake assembly controlled through an open protocol and configured to receive wireless transmitted signals from an app running on a smart phone or other such applications. The flywheel assembly also includes a bracket coupling the magnetic brake with a frame. A strain gauge is mounted on the bracket to detect torque, which is used to calculate a rider's power while using the trainer.
1. A bicycle trainer comprising:
a frame assembly supporting an axle to which a bicycle with a rear wheel removed may be connected to operably connect the bicycle to the bicycle trainer;
a flywheel assembly comprising a magnetic brake assembly and a flywheel member including a flywheel axle, the flywheel assembly supported on the frame assembly, the magnetic brake assembly rotationally fixed and coupled with a tubular member coaxial with the flywheel axle, the flywheel member coupled with the axle such that the flywheel member spins relative to the rotationally fixed magnetic brake assembly when a rider is pedaling a bicycle connected with the axle.
2. The bicycle trainer of claim 1 wherein the frame assembly comprises:
a main frame member pivotally coupled with a bracket, the main frame member supporting the axle;
a center frame member extending from the main frame member;
a member pivotally connected with the main frame member and configured to adjustably connect with the center frame member along a length of the center frame member;
whereby the axle may be vertically adjusted by connecting the member at different positions of the center frame member which thereby supports the main frame member at different pivot positions corresponding to different heights of the axle.
3. The bicycle trainer of claim 2 wherein the frame assembly comprises:
a first leg and a second leg, each of the first and second legs being pivotally mounted on the frame assembly to pivot inwardly toward the center frame member or outwardly from the center frame member.
4. The bicycle trainer of claim 1 further comprising a reversible spacer coupled with the axle, the reversible spacer having a first portion defining a first width and a second portion defining a second width, the first width corresponding with a first dropout spacing of a bicycle and the second width corresponding with a second dropout spacing wider than the first dropout spacing.
5. The bicycle trainer of claim 3 , wherein the frame assembly further comprises a mounting bracket including a first arcuate surface adjacent to which the first leg is pivotally mounted, the bracket including a second arcuate surface adjacent to which the second leg is pivotally mounted; and
the arcuate surface defining a first notch along the first arcuate surface and a second notch along the second arcuate surface, the first notch receiving a first spring loaded pin to secure the first leg in an outwardly pivoted position, the second receiving a second spring loaded pin to secure the second leg in an outwardly pivoted position.
6. The bicycle trainer of claim 1 wherein:
the frame assembly comprising a main frame member supporting the axle, the flywheel axle rotatably supported at the main frame member.
7. The bicycle trainer of claim 6 wherein the magnetic brake assembly is an electromagnetic brake assembly further comprising a plurality of electromagnetic members mounted on a core, the electromagnetic members controllable to generate a magnetic field that magnetically couples with the flywheel member.
8. The bicycle trainer of claim 7 wherein the plurality of electromagnetic members are each equidistantly spaced about the core.
9. The bicycle trainer of claim 7 wherein the plurality of electromagnetic members comprise a T-shaped portion of the core extending radially from an annular main body and a conductor is wound about the T-shaped portion.
10. The bicycle trainer of claim 9 wherein there are six electromagnetic members.
11. The bicycle trainer of claim 1 wherein a first pulley is coupled with the axle, the first pulley interconnected with a second pulley coupled with the flywheel axle, and wherein a cassette is coupled with the axle whereby a chain from the bicycle engaging the cassette may drive the first pulley and through the interconnection between the first pulley with the second pulley drive the flywheel member.
12. The bicycle trainer of claim 1 wherein the magnetic brake assembly and the flywheel member are rotationally supported relative to a common axis, and further comprising a member coupled between the magnetic brake assembly and the frame assembly, the member rotationally fixing the magnetic brake assembly relative to the flywheel member.
13. The bicycle trainer of claim 12 further comprising a strain gauge mounted on the member that detects torque imparted on the member when a rider is pedaling.
14. A bicycle trainer comprising:
a frame assembly supporting an axle to which a bicycle with a rear wheel removed may be connected to operably connect the bicycle to the bicycle trainer;
a flywheel assembly comprising a magnetic brake assembly and a flywheel member including a flywheel axle, the flywheel assembly supported on the frame assembly, the magnetic brake assembly rotationally fixed and axially aligned with the flywheel axle, the flywheel member coupled with the axle such that the flywheel spins relative to the magnetic brake assembly when a rider is pedaling a bicycle connected with the axle.
15. The bicycle trainer of claim 14 further comprising a tubular member coaxial with the flywheel axle to provide the axial alignment, the magnetic brake assembly operably coupled with the tubular member.
16. The bicycle trainer of claim 15 further comprising a member coupled between the magnetic brake assembly and the frame assembly, the member rotationally fixing the magnetic brake assembly.
17. The bicycle trainer of claim 16 further comprising a strain gauge mounted on the member that detects torque from a rider is pedaling.
18. The bicycle trainer of claim 17 wherein the magnetic brake assembly is an electromagnetic brake assembly further comprising a plurality of electromagnetic members mounted on a core, the electromagnetic members controllable to generate a magnetic field that magnetically couples with the flywheel member.
19. The bicycle trainer of claim 18 wherein the frame assembly comprises:
a main frame member pivotally coupled with a bracket, the main frame member supporting the axle;
a center frame member extending from the main frame member;
a member pivotally connected with the main frame member and configured to adjustably connect with the center frame member along a length of the center frame member, whereby the axle may be vertically adjusted by connecting the member at different positions of the center frame member which thereby supports the main frame member at different pivot positions corresponding to different heights of the axle; and
a first leg and a second leg, each of the first and second legs being pivotally mounted on the frame assembly to pivot inwardly toward the center frame member or outwardly from the center frame member.