roundup for measuring the unbalance of motor vehicle engines

摘要

A cradle of inverted U shape is suspended from a frame and rockable on vertical and horizontal axes. With the cradle locked to the frame an engine to be tested is placed within the cradle and rigidly locked thereto at an exact predetermined location. The crankshaft is rotated by drive means so constructed as to add minimum dynamic unbalance to the engine. The cradle is unlocked from the frame and the dynamic unbalance of the engine is measured by seismic transducers engaging the engine or directly attached to the cradle.