HYDRAULIC SYSTEM OF WHEEL EXCAVATOR Russian patent published in 2010 - IPC E02F9/22 

FIELD: construction.

SUBSTANCE: invention refers to the field of machine building, namely to wheel excavator with hydraulic system. Hydraulic system of wheel excavator comprises pumps, stroke hydraulic motors, hydraulic distributor with address travel spool, power hydraulic lines including discharge power hydraulic line and power hydraulic lines of stroke hydraulic motors, servocontrol hydraulic lines, hydraulic switch of speeds with tap to connection of the second gear, unit of address travel spool control with tap to start excavator movement "forward". Hydraulic system comprises additional power circuit connected into power hydraulic lines between stroke hydraulic motors and discharge power hydraulic line, and additional circuit of servocontrol connected into hydraulic lines of servocontrol between hydraulic switch of speeds and unit of address travel spool control. Additional power circuit includes three-position spool with normally closed inlet, two outlets and two cavities of servocontrol, two-position spool with two inlets, four outlets and cavity of servocontrol, hydraulic lines that connect outlets of three-position spool to according inlets of two-position spool, and also hydraulic lines that connect the first and second outlets of two-position spool with power hydraulic lines of stroke hydraulic motors, the third and fourth outlets of which are arranged with the possibility to connect additional hydraulic set to them, for instance hydraulic hammer. Additional circuit of servocontrol consists of three-position spool control unit, having two taps, valve OR with tap and two feeds, valve AND with tap and two feeds.

EFFECT: invention provides for displacement of excavator under severe road conditions at the second gear, and also expanded functionality.

3 dwg