APPARATUS, SYSTEM AND METHOD FOR POWER MEASUREMENT AT A CRANK AXLE AND CRANK ARM
First Claim
1. A power measurement assembly comprising:
- a crank axle;
a first strain gauge mounted on an inner portion of the crank axle; and
a first circuit connected to the strain gauge and configured to provide a first output proportional to a force applied to the crank axle.
1 Assignment
0 Petitions
Accused Products
Abstract
A power measurement assembly mounted within an axle. In a specific example, the axle is a spindle that is interconnects the cranks of a bicycle, exercise, bicycle, or other fitness equipment. The power measurement assembly may include strain gauges connected with an appropriate circuit (e.g., Wheatstone bridge) that provides an output of the force on the axle by a rider pedaling the crank. In the case of an axle, the strain gauges measure the torsion due to the applied torque on the crank. The value is converted to a power value by a processor and that value is then wirelessly transmitted for display. The processor and/or the transmitter may be mounted within the axle. A separate power measurement assembly may be mounted on one of the cranks, which may include its own processor and transmitter or may take advantage of the processor and transmitter within the axle.
8 Citations
20 Claims
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1. A power measurement assembly comprising:
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a crank axle; a first strain gauge mounted on an inner portion of the crank axle; and a first circuit connected to the strain gauge and configured to provide a first output proportional to a force applied to the crank axle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A power measurement device comprising:
a crank axle defining a hollow inner portion supporting at least one strain gauge, the hollow inner portion further including a first circuit connected to the strain gauge and configured to provide a first output proportional to a force applied to the crank axle, the first circuit coupled with a processor configured to receive the first output from the first circuit and calculate a first force value, the inner portion further comprising a wireless transmitter in operable communication with the processor, the wireless transmitter configured to transmit information representative of the first force value. - View Dependent Claims (20)
Specification