Patent ID: 6702055
Filing Date: 2004-03-09
Classification: F16H

Abstract:
Hydrostatic drive (1) with a first hydraulic pump (4) and with a first hydraulic motor (12) which is connected to the first hydraulic pump (4) in a closed hydraulic circuit (6) via a forward-flow line (7) and a return-flow line (8) an drives at least one first vehicle wheel (14, 15, 18, 19), characterized by a second hydraulic pump (5) and a second hydraulic motor (22) which is connected to the second hydraulic pump (5) in an open hydraulic circuit (9) via a supply line (11) and drives at least one second vehicle wheel (23), the return of the hydraulic fluid from the second hydraulic motor (22) to the second hydraulic pump (5) taking place via a hydraulic fluid tank (10), a control valve (21) which supplies the second hydraulic motor (22) with a variable volumetric flow dependent on a control signal controlling the control valve (21) being arranged in the supply line (11) of the open hydraulic circuit (9), said first hydraulic motor (12) driving the vehicle wheels (14, 15) of at least one first vehicle axle (17), wherein besides the second hydraulic motor (22) a third hydraulic motor (25) is connected to the control valve (21), the second hydraulic motor (22) and the third hydraulic motor (24) driving opposite vehicle wheels (23, 25) of a second vehicle axle (36), and the control valve (21) supplying the second hydraulic motor (22) and the third hydraulic motor (23) with separate, variable volumetric flows in dependence on the control signal.