Cylinders 2 are rigidly secured to shaft 1 and rotate together with it. Plate 3 is connected by a turning pair to shaft 1 and its pins a fit into holes in ring 5 which slides in fixed guide b. Connecting rods 6 are connected on each end by spherical pairs to ring 5 and to pistons 4. When shaft 1 rotates pistons 4 reciprocate with respect to cylinders 2 and their stroke depends upon the size of angle α.
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