Cassette-Based Power Meter
First Claim
1. A bicycle comprising:
- a frame;
a pair of wheels including a driven wheel mounted to the frame;
a rotatable pedal assembly mounted to the frame;
a chain drive associated with the rotatable pedal assembly and configured to cause rotation of the driven wheel in response to rotation of the rotatable pedal assembly;
a drive gear arrangement drivingly interconnected with the driven wheel and driven by the chain drive during operation of the rotatable pedal assembly, wherein the drive gear arrangement includes an internal cavity; and
a torque sensing arrangement positioned within the internal cavity of the drive gear arrangement for measuring torque applied by a user to the drive gear arrangement through the chain drive and the pedal assembly.
2 Assignments
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Accused Products
Abstract
A cassette-based power measuring apparatus includes a power sensing arrangement mounted within a cavity defined by a hollow bicycle cassette. The power sensing arrangement includes a torque sensing assembly including torque sensing elements configured to measure a user applied torque. The torque sensing elements are in communication with an electronics assembly configured to process the measured data and transmit it to a receiver. The torque sensing assembly may comprise a torque tube or a series of bending beams secured between a rear plate of the cassette and a freehub. The torque tube or bending beams may include strain gauges bonded thereto for measuring strain induced by application of forces in response to user-applied power.
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Citations
22 Claims
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1. A bicycle comprising:
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a frame; a pair of wheels including a driven wheel mounted to the frame; a rotatable pedal assembly mounted to the frame; a chain drive associated with the rotatable pedal assembly and configured to cause rotation of the driven wheel in response to rotation of the rotatable pedal assembly; a drive gear arrangement drivingly interconnected with the driven wheel and driven by the chain drive during operation of the rotatable pedal assembly, wherein the drive gear arrangement includes an internal cavity; and a torque sensing arrangement positioned within the internal cavity of the drive gear arrangement for measuring torque applied by a user to the drive gear arrangement through the chain drive and the pedal assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power sensing assembly for use with an apparatus powered by a user applied force to a pedal assembly and including a gear arrangement for driving a wheel of the apparatus, the power sensing assembly comprising:
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a torque sensing assembly mounted within an internal cavity defined by the gear arrangement having a plurality of torque sensing elements in communication therewith, wherein the torque sensing assembly is configured to measure the torque applied by a user to the pedal assembly; a velocity sensor that detects rotation of a wheel of the apparatus; and a processor that determines power associated with the applied force to the pedal assembly from the torque measured by the torque sensing assembly and angular velocity information provided by the velocity sensor. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A bicycle wheel, comprising:
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a rim; an inner hub area; a drive gear arrangement drivingly interconnected with the inner hub area, wherein the drive gear arrangement includes an internal cavity; and a torque sensing arrangement positioned within the internal cavity of the drive gear arrangement for measuring torque applied by a user to the drive gear arrangement. - View Dependent Claims (22)
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Specification