Patent ID: 6991303

Claim:
A hydraulic braking system operated by an external force, for vehicles, in particular motor vehicles, having at least two axles, comprising a low-pressure-side hydraulic reservoir ( 3 ), at least one primary pressure source ( 2 ′, 2 ″) which is operated by external energy and which is connected to the hydraulic reservoir ( 3 ) for the supply of a hydraulic medium, an auxiliary pressure source ( 10 ) which is independent of said primary pressure source ( 2 ′, 2 ″) and can be actuated by an operator and which is connected to the hydraulic reservoir ( 3 ) for the supply of hydraulic medium and the delivery side of which communicates with the hydraulic reservoir ( 3 ) in the non-actuated state off the auxiliary pressure source ( 10 ), displacer assemblies ( 5 ) each being assigned to a wheel brake for independent actuation of the latter, normally closed controllable inlet valves ( 6 ) which are assigned each separately to the displacer assembly ( 5 ) for the controllable connection of the latter to the primary pressure source or to one of the primary pressure sources ( 2 ′, 2 ″), normally open connecting valves ( 7 ) which are assigned each to the displacer assembly ( 5 ) and in parallel to the respective inlet valve ( 6 ) and which are interconnected with one another, axle by axle, on their side facing away from the assigned displacer assembly ( 5 ), a normally closed outlet valve ( 8 ) which is assigned each to an axle and arranged in each case between the hydraulic reservoir ( 3 ) and the interconnected sides of the connecting valves ( 7 ) of the respective axle, and normally open separating valves ( 9 ) which are assigned each to an axle and are arranged in each case parallel to the outlet valve ( 8 ) of the respective axle between the auxiliary pressure source ( 10 ) and the interconnected sides of the connecting valves ( 7 ) of this axle, other axles including further outlet valves ( 8 ) between the hydraulic reservoir ( 3 ) and the interconnected sides of the connecting valve ( 7 ) of these axles and further separating valves ( 9 ) being arranged between the delivery side of the auxiliary pressure source ( 10 ) and the interconnected sides of the connecting valves ( 7 ) of these axles, the outlet valves ( 8 ) forming a series connection, in which the connecting valves ( 7 ) of a second axle are connected in each case between the outlet valves of the first and of the second axle.