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 a first axle, the first axle adapted to be connected to a pair of drop-outs from a bicycle with a rear wheel removed from the pair of drop-outs to operably connect the bicycle to the bicycle trainer;
a flywheel assembly comprising a magnetic brake assembly and a flywheel member, the flywheel assembly rotatably supported on the frame assembly along a common axis such that the magnetic brake assembly and the flywheel member are permitted to rotate in a common direction and about the common axis, the magnetic brake assembly rotationally fixed by a member coupled between the magnetic brake assembly and the frame assembly, and the flywheel member coupled with the first axle such that the flywheel spins relative to the rotationally fixed magnetic brake assembly when a rider is pedaling a bicycle connected with the first axle; and
a strain gauge mounted on the member that detects torque imparted on the member when a rider is pedaling.
2. The bicycle trainer of claim 1 wherein the frame assembly is vertically adjustable.
3. 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 first axle;
a center frame member extending from the main frame member;
an adjustment bracket 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 vertical height of the first axle may be adjusted by connecting the adjustment bracket 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.
4. The bicycle trainer of claim 3 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.
5. The bicycle trainer of claim 1 further comprising a reversible spacer coupled with the first 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.
6. The bicycle trainer of claim 4 , wherein the frame assembly further comprises a mounting bracket including:
a first arcuate surface adjacent to which the first leg is pivotally mounted;
a second arcuate surface adjacent to which the second leg is pivotally mounted; and
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 notch receiving a second spring loaded pin to secure the second leg in an outwardly pivoted position.
7. The bicycle trainer of claim 1 wherein:
the frame assembly comprising a main frame member supporting the first axle;
the magnetic brake assembly comprising a plate coupled with a tubular member coaxial with a flywheel axle, the flywheel axle rotatably supported at the main frame member; and
the member coupled between the main frame member and the plate whereby the member prohibits rotation of the magnetic brake assembly about the flywheel axle.
8. The bicycle trainer of claim 7 wherein a pin is coupled between the main frame member and the member, the pin supported in a bushing within an aperture of the member.
9. The bicycle trainer of claim 8 wherein the strain gauge is mounted on the member to measure tension or compression.
10. The bicycle trainer of claim 9 wherein the member defines a neck portion on which the strain gauge is mounted to measure deflection of the member.
11. The bicycle trainer of claim 1 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.
12. The bicycle trainer of claim 1 wherein a first pulley is coupled with the first axle, the first pulley interconnected with a second pulley coupled with a flywheel axle rotatably supporting the flywheel member, and wherein a cassette is coupled with the first 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.
13. A bicycle trainer comprising:
a frame assembly including an electromagnetic brake assembly rotatably mounted on the frame assembly along an axis, and a flywheel member configured to be driven by a bicycle removably connectable with the frame assembly and the flywheel member, the flywheel member supported along the axis; and
a means for measuring torque and for rotationally fixing the electromagnetic brake assembly, the means operably coupled between the electromagnetic brake assembly and the flywheel member,
wherein the electromagnetic brake assembly comprises a plurality of electromagnets circumferentially distributed about the axis.
14. A bicycle trainer comprising:
a frame assembly supporting an axle, the axle adapted to be connected to a pair of drop-outs from a bicycle with a rear wheel removed from the pair of drop-outs to operably connect the bicycle to the frame assembly;
a flywheel member supported on the frame assembly;
a magnetic brake assembly rotatably supported on the frame assembly along an axis of rotation, the magnetic brake assembly also rotationally fixed to the frame assembly such that the flywheel member spins about the axis of rotation relative to the rotationally fixed magnetic brake assembly when a rider is pedaling a bicycle connected with the axle; and
a torque measurement device operably supported between the magnetic brake assembly and the flywheel member to detect torque when a rider is pedaling,
wherein the magnetic brake assembly comprises a plurality of electromagnets circumferentially distributed about the axis.
15. The bicycle trainer of claim 14 wherein the torque measurement device comprises a member coupled between the brake assembly and the frame assembly, the member rotationally fixing the magnetic brake assembly, the torque measurement device further comprising at least one strain gauge mounted on the member that detects torque imparted on the member when a rider is pedaling.
16. The bicycle trainer of claim 14 wherein the frame assembly is vertically adjustable.
17. The bicycle trainer of claim 16 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;
an adjustment bracket 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 vertical height of the axle may be adjusted by connecting the adjustment bracket 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.
18. The bicycle trainer of claim 17 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.
19. A bicycle trainer comprising:
a frame assembly supporting an axle to which a bicycle may be operably connected to drive a flywheel member supported on the frame assembly;
a magnetic brake assembly rotatably supported on the frame assembly, and fixed to the frame assembly 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;
a torque measurement device operably supported between the magnetic brake assembly and the flywheel member to detect torque when a rider is pedaling;
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; and
an aperture in the frame assembly configured to receive the first portion and the second portion, the aperture having a depth at least as deep as the width of the second width.
20. The bicycle trainer of claim 1 wherein the magnetic brake assembly is coupled with a second axle along the common axis, and the flywheel is coupled with a third axle also along the common axis.
21. The bicycle trainer of claim 20 wherein the second axle is a tubular member through which the third axle extends, the third axle co-axial with the tubular member.
22. The bicycle trainer of claim 14 wherein the magnetic brake assembly is rotationally supported on the frame assembly coaxially with the flywheel member, the magnetic brake assembly also fixed to the frame assembly 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.
23. The bicycle trainer of claim 22 wherein the magnetic brake assembly is coupled with a tubular member through which a second axle coupled to the flywheel extends, the tubular member supported to rotate relative to the second axle and rotationally fixed by a member coupled between the frame assembly and the magnetic brake assembly, the torque measurement device operably coupled with the at least one member.