HYDRAULIC DRIVE Russian patent published in 2002 - IPC

FIELD: load-lifting facilities; hydraulic drives. hydraulic drive has one side-action hydraulic motor with plunger and auxiliary spaces for extending the plunger, and step-action hydraulic motor provided with at least one space for forced displacement of corresponding plunger. It has also controlled hydraulic distributor for connecting above-indicated hydraulic motors to pressure and drain lines. One side-action hydraulic motor is provided with ram-pipeline. Step-action hydraulic motor plunger is rigidly coupled with one side-action hydraulic motor plunger, plunger space of the latter being placed in communication with plunger space of step-action hydraulic motor by hydraulic line. Controlled hydraulic distributor has two two-position distributors Connected with plunger and auxiliary spaces of one side-action hydraulic motor. EFFECT: improved operating characteristics. 2 cl, 1 dwg