TWO-FLOW HYDRAULIC DRIVE OF SINGLE-BUCKET EXCAVATOR Russian patent published in 1997 - IPC

FIELD: mechanical engineering; earth moving machinery; hydraulic drive of construction and road building machines. SUBSTANCE: two-flow hydraulic drive of single- bucket excavator has two pumps connected by flow-through channels of multiple- spool hydraulic distributor which has housing with bridges and spools to control hydraulic motors of working members, and also pressure and return hydraulic lines. Spools directing working liquid to hydraulic motors are provided with additional grooves. The latter are located on each first control spool at pump side at different flow-through channels. Length of grooves depend on thickness of bridge in flow through channel housing, summary displacement of control spool and summary width of slots of flow-through channel. EFFECT: improved reliability of operation. 4 dwg