Measuring and testing – Dynamometers – Responsive to torque
Patent
1982-12-27
1984-11-20
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to torque
188264B, G01L 316
Patent
active
044832044
ABSTRACT:
An improved power absorption device of the general Prony brake design is capable of either applying to a rotating shaft either a fixed force or a force proportional to its rotational speed or for measuring mechanical power transferred to a rotating shaft by a prime mover. A stator shaft aligned with the rotating shaft is sealed within a cylindrical drum which is coupled to the rotating shaft and rotated thereby. A hydraulic system actuates a plurality of pistons in radially outward directions so as to frictionally engage the inner surface of the rotating drum. The resulting heat build-up is transferred through the finned, high-heat transfer lateral walls of the drum to water in a tank in which the rotating drum is located. Brake lubrication is provided by a closed lubricant circulation system within the rotating drum capable of providing efficient, uniform lubrication of the brake surfaces. The drum is sealed to prevent the loss of lubricant therefrom as well as water contamination therein while the level of lubricant in the brake cell is easily checked by visual means. The closed lubricant circulation system protects the friction material from wear and lubricant glazing and permits the brake to operate at high temperatures without lubricant loss due to "cook off". Means are provided for continuously filtering the brake lubricant for removing "slough off" friction material therefrom.
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