| 摘要 |
<p>In a device for measuring the power of a crank drive in which the torque is transmitted from the crank (1) to a drive disk (2), for example to the face of the bottom bracket ball bearing of a bicycle, the mechanical parameters, torque and angular speed of the crank are converted to electric signals. The force (K) exerted on the crank via a deformation element (3), for example a flexible element, is transmitted to the drive disk (2) and the deformation of the deformation element (3), which is a measure of the force (K), is converted to an electric signal by elongation gauges (6), inductive displacement sensors, or piezoelectric crystals. The angular speed of the crank (1) is measured by a reed contact, a light barrier, an induction loop, or a mechanical tachometer. When this type of power measurement is applied to a bicycle, the pedalling power is not converted to braking heat as in the case of stationary ergometers, but can be converted to forward movement of the bicycle.</p> |
