HYDRAULIC FLOW BOOST ARRANGEMENT AND HYDRAULIC SYSTEM

A hydraulic system with a flow boost arrangement (10) comprising a first port (21), a second port (22) and a tank (25) for a working fluid and a first displacement-type ring gear machine (11) and a second displacement-type ring gear machine (12) is described. The flow boost arrangement (10) and the hydraulic system allow an individually adaptable working area having wide range of torque or fluid flow in connection with low cost and low space requirements. In the flow boost arrangement (10) an inlet port (11a) of the first ring gear machine (11) is connected to the first port (21) and an outlet port (12b) of the second ring gear machine (12) is connected to the second port (22), wherein the tank (25) is in fluid communication to a first tank connection line (20) for the working fluid, wherein a first shaft (15) of a first internal gear of the first ring gear machine (11) and a second shaft (16) of a second internal gear of the second ring gear machine (12) are connected such that the first shaft (15) and the second shaft (16) rotate with the same rotational speed, wherein a first displacement volume (V1) of the first ring gear machine (11) is different from a second displacement volume (V2) of the second ring gear machine (12), wherein an inlet port (12a) of the second ring gear machine (12) is connected to an outlet port (11b) of the first gear machine (11) and the first tank connection line (20).