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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When the engine is running, the frictional force between the drum and the band will increase the force reading on one balance and decrease it on the other.

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File:Prony brake.svg

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


If the engine speed is measured with a freothe brake horsepower is easily calculated. By using this site, you agree to the Terms of Use and Privacy Policy.

Prony brake – Wikipedia

This page was last edited on 23 Octoberat The term ” brake horsepower ” is one measurement of power derived from this method of measuring torque. The difference between the two readings multiplied by the radius of the driven drum is equal to the torque.

This technology-related article is a stub. The device is generally 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.

File:Prony – Wikimedia Commons

A substantial pre-load is then applied to the ends of the band, so that each spring balance has an initial and identical reading. Power is calculated by multiplying torque by rotational speed.

In its simplest form an engine is connected to a rotating drum by means of an output shaft. Views Read Edit View history.


An alternate mechanism is to clamp a lever to the shaft and measure using a single balance. Retrieved from ” https: The Prony Brake is a simple device invented by Gaspard de Prony to measure the torque produced by an engine.

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. Power output in SI units may be calculated as follows:.

The friction is increased by tightening the belt until the frequency of rotation of the shaft is reduced. In practice more engine power can then be applied until the limit of the engine is reached. From Wikipedia, the free encyclopedia.