Patent ID: 6996979

Claim:
A hydraulic circuit for a hydraulic excavator having at least two motor drives, each of which acts on at least two closed drive circuits which are connected in parallel and each has a hydraulic pump and a hydraulic motor, in each case two drive circuits forming a drive circuit group and all the drive circuit groups being connected in parallel and operating on a common output drive, connecting lines being provided between the hydraulic pumps and hydraulic motors of each drive circuit group, wherein the connecting lines (L 111 , L 112 ; L 121 , L 122 ; L 211 , L 212 ; L 221 , L 222 ) of each drive circuit group (AKG 1 , AKG 2 ) are arranged only between the hydraulic pumps (P 11 , P 12 ; P 21 , P 22 ) and the hydraulic motors (HM 11 , HM 12 ; HM 21 , HM 22 ) of the respective drive circuit group (AKG 1 , AKG 2 ), in such a way that there is no hydraulic connection between the different drive circuit groups (AKG 1 , AKG 2 ), the respective drive circuit group (AKG 1 , AKG 2 ) each having its own control valve (S 1 , S 2 ) connected to it.