HYDRAULIC DRIVE OF PNEUMATIC WHEELED EXCAVATOR Russian patent published in 2018 - IPC E02F9/22 

FIELD: machine engineering.

SUBSTANCE: in the known hydraulic drive of the pneumatic wheeled excavator, an additional circuit is included in the servo control system consisting of two pedal control units and enabling execution by each of them, at least two functions of hydro-valve EITHER with two inputs and one output branch and two electro-hydraulic distributors with two outputs and one input branch each. The first pedal control unit is connected to the first input branch of hydraulic valve OR the second pedal control unit is connected to the second input branch of the OR hydraulic valve, the stroke hydraulic motor and the switching distributor, the output branch of the OR hydraulic valve is connected to the input taps of both electro-hydraulic distributors, the output taps of the first electro-hydraulic distributor are connected to the address spool of the stroke, the output taps of the second electro-hydraulic distributor are connected to the address spool of blade supports.

EFFECT: reduced fatigue, increased comfort and safety for the operator, increased the functionality of the excavator.

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