Measuring and testing – Dynamometers – Responsive to torque
Patent
1986-07-03
1988-01-12
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to torque
7386212, 7386217, G01L 320, G01L 318, G01L 322
Patent
active
047182865
ABSTRACT:
A dynamometer system for applying a controlled variable operating load against the blade of a rotary-type lawn mower while the mower is in stationary operation atop the system. The system includes a frame for supporting and securing the lawn mower thereupon, a dynamometer having an input shaft connected to the frame, the input shaft of the dynanometer including at its distal end a rotary-type blade engaging crossbar. By this arrangement, a controlled load may be applied by the dynanometer against the rotating blade and thus the motor of the lawm mower while it is operating in stationary position atop the frame to aid in testing, diagnosing problems, and adjusting the motor. The dynamometer is preferably hydraulic, although it may also be of the electric absorption or mechanical absorption type. The hydraulic dynamometer also includes a reservoir and filled with hydraulic fluid in fluid communication with a closed loop fluid circulating system whereby hydraulic fluid is drawn from the reservoir through the dynamometer and returned back to the reservoir for continual recycling. The hydraulic fluid exiting the dynamometer may be restricted by valve means in the closed loop fluid circuit which also includes fluid flow and pressure measuring means which produces information relative to motor horsepower output values. This restricting valve provides means for controlled variability of the power absorbed by the dynamometer.
REFERENCES:
patent: 3969931 (1976-07-01), Lanning
Prescott Charles J.
Ruehl Charles A.
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