SELF-OSCILLATORY HYDRAULIC DRIVE Russian patent published in 2012 - IPC F15B21/12 F15B11/15 F15B13/16 F15B3/00 

FIELD: machine building.

SUBSTANCE: drive comprises a double-acting piston-cylinder, the main control quadrilinear hydraulic distributor with hydraulic control, two control three-directional hydraulic distributors and additional start-up four-way two-position hydraulic distributor with hydraulic control. The spool of the hydraulic distributor is spring-loaded on the part of one of its ends by a spring with adjustable preload force. The output channel and spring chamber of the start-up control of the hydraulic distributor are connected to the drain hydraulic lines of the drive, the input channel and the hydraulic distributor control chamber, opposite to the spring chamber are connected to pressure hydraulic lines of the hydraulic power source, and each of the two executive channels is connected to a respective chamber of the working cylinder. In the initial position of the spool of the start-up hydraulic distributor all its channels are closed, and in the working position of the spool one of the executive control channels of the hydraulic distributor is connected to its input channel, and another executive channel is connected to the output channel of the hydraulic distributor.

EFFECT: increased reliability of starting operation of self-oscillatory hydraulic drive.

2 cl, 1 dwg