SINGLE-BUCKET EXCAVATOR TWO-FLOW HYDRAULIC DRIVE Russian patent published in 2004 - IPC

FIELD: earth-moving machinery.

SUBSTANCE: invention relates to quarry, construction, road-building and other machines, particularly, to single-bucket excavators. Proposed two-flow hydraulic drive of single-bucket excavator consists of pumps connected with directed opposite to each other through channels of multiple spool hydraulic device including hydraulic distributors with lands in housing of multiple-spool hydraulic device, and control spools with grooves, return and safety-makeup valves and pressure and drain hydraulic lines. Control spools of hydraulic distributors of bucket, arm and boom or any separate, for instance, boom moving hydraulic distributor control spool, are made with grooves increased by length of spool travel to one side. Total length of grooves complies with following dependence: L=H+2S+b where H is travel of control spool to one side; 2S is summary length of through ports of through channel: b is length of housing land.

EFFECT: increased capacity of excavator, reduced nonproductive expenses, improved controllability of working equipment.

2 dwg