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US 12,496,504 B2Granted
Bicycle trainer torque measurement device
AssigneeSram, LLC
InventorOwen Britton
Life of this patent
Estimating the term…
Abstract
A bicycle trainer having a device for direct measurement of torque through a stator of a generator style resistance unit of a bicycle trainer is provided. The direct measurement may be accomplished through the disposition of strain gauges on a device positioned at the intersection of a stator and rigid frame attachment of the generator style resistance unit. The strain gauges may be disposed on radially extending spokes of the stator, or a carrier therefore.
Claims11
A bicycle trainer comprising:
- a base defining a rotation axis;
- a carrier having an inner portion non-rotatably fixed to the base, an outer portion radially spaced from the inner portion and a first face member extending radially between the inner portion and the outer portion;
- a stator connected to the outer portion of the carrier and comprising a plurality of circumferentially spaced electromagnets radially spaced from the rotation axis;
- a rotor rotatably mounted to the base, wherein the rotor comprises at least one magnet disposed radially outward of the electromagnets and a second face member axially spaced from the first face member, and wherein the rotor is rotatable relative to the stator about the rotation axis;
- and
- at least one strain measurement device disposed on one of the first face member and/or the second face member;
- wherein the at least one strain measurement device comprises at least one shear strain gauge disposed on the first face member.
4 more elements
A bicycle trainer comprising:
- a base defining a rotation axis;
- a carrier having an inner portion non-rotatably fixed to the base, an outer portion radially spaced from the inner portion and a first face member extending radially between the inner portion and the outer portion;
- a stator connected to the outer portion of the carrier and comprising a plurality of circumferentially spaced electromagnets radially spaced from the rotation axis;
- a rotor rotatably mounted to the base, wherein the rotor comprises at least one magnet disposed radially outward of the electromagnets and a second face member axially spaced from the first face member, and wherein the rotor is rotatable relative to the stator about the rotation axis;
- and
- at least one strain measurement device disposed on one of the first face member and/or the second face member;
- wherein the at least one strain measurement device comprises at least one shear strain gauge including a conductive strip defining parallel grid lines, wherein the grid lines are oriented at an acute angle between 30 and 60 degrees relative to a line extending radially from the rotation axis.
4 more elements
A bicycle trainer comprising:
- a base comprising a frame and an axle, the axle comprising a first hub, wherein the axle defines a rotation axis and the axle is non-rotatably fixed to the frame;
- a carrier connected to the axle having an inner portion non-rotatably fixed to the base, an outer portion radially spaced from the inner portion and a first face member extending radially between the inner portion and the outer portion, wherein the inner portion of the carrier comprises a second hub non-rotatably connected to the first hub;
- a stator connected to the outer portion of the carrier and comprising a plurality of circumferentially spaced electromagnets radially spaced from the rotation axis;
- a rotor rotatably mounted to the base and rotatably supported by the axle, wherein the rotor comprises at least one magnet disposed radially outward of the electromagnets and a second face member axially spaced from the first face member, and wherein the rotor is rotatable relative to the stator about the rotation axis;
- and
- at least one strain measurement device disposed on one of the first face member and/or the second face member.
3 more elements
Dependencies are inferred from the claim text.