electron, Fis, Fis ondas threshold frequency; – de utilizacion/ing meca operating veh smooth hraking freno m alto, ing meca hrake, meca drag, veh hrake; – de de pie m alto, veh foothrake; – de Prony m alto, veh Prony hrake; – del remolque. PROM — memoria programable de solo lectura. prony brake — a simple friction brake dynamometer. freno prony — un dinamometro para los frenos de friccion. Conducción por pulso y deslizamiento—técnica de conducción de un vehículo freno prony—un dinamómetro para los frenos de fricción simple. propane.

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The difference between the two readings multiplied by the radius of the driven drum is equal to the torque. The friction is increased by tightening the belt until the frequency of rotation of the shaft is reduced.

Prony brake – Wikipedia

If the engine speed is measured with a tachometerthe brake horsepower is easily calculated. Power is calculated by multiplying torque by rotational speed. When the engine is running, the frictional force between pronyy drum and the band will increase the force reading on one balance and decrease it on the other. The Prony Brake is a simple device invented by Gaspard de Prony to measure the torque produced by an engine.


An alternate mechanism is to clamp a lever to the shaft and measure using a single balance. By using this site, you agree to the Terms of Use and Privacy Policy. This technology-related article is a stub.

The torque is then related to the lever length, shaft diameter and measured force. A friction band is wrapped around half the drum’s circumference and each end attached to a separate spring balance.

File:Prony brake.svg

In its simplest form an engine is connected to a rotating drum by means of an output shaft. Power output in SI units may be calculated as follows:.

You can help Wikipedia by expanding it. This page was last edited on 23 Octoberat The device is ve used over a range of engine speeds to obtain power and torque curves for the engine, since there is a non-linear relationship between torque and engine speed for most engine types. A substantial pre-load is then applied to the ends of the band, so that each spring balance has an initial and identical reading.


Essentially the measurement is made by wrapping a cord or belt around the output shaft of the engine and measuring the force transferred to the belt through friction. Retrieved from ” https: The term ” brake horsepower ” is one measurement of power derived from this method of measuring torque. Views Read Edit View history.

In practice more engine power can then be applied until the limit of the engine is reached. From Wikipedia, the free encyclopedia.