Anti-lock hydraulic braking system, in particular for motorized two-wheel vehicles

An anti-lock hydraulic braking system for two-wheel vehicles, comprising:

• a wheel brake circuit which comprises a main brake cylinder, at least one wheel brake cylinder and a switching valve therebetween;
• and
• an auxiliary pressure circuit which is connected in parallel between the switching valve and the wheel brake cylinder on the wheel brake circuit via first and second hydraulic connection points and which comprises a hydraulic pump for producing a volume flow, a throttle device arranged downstream of the hydraulic pump, and a volume equalization device that is connected between the hydraulic pump and the throttle device on the auxiliary pressure circuit;
• said first hydraulic connection point being located downstream of the hydraulic pump between the switching valve and the second hydraulic connection point, said second hydraulic connection point being located upstream of the hydraulic pump on the auxiliary pressure circuit between the first hydraulic connection point and the wheel brake cylinder, and said wheel brake circuit being free of any electromagnetic operated switching valve between said first hydraulic connection point and said wheel brake cylinder;
• the braking system being provided with an anti-lock operating phase;
• the switching valve being positioned upstream from the first hydraulic connection point on the wheel brake circuit, having a basic position, in which it hydraulically connects the main brake cylinder and the wheel brake cylinder, and a switched position, into which it switches from the basic position in the anti-lock operating phase and in which it prevents a build-up of a braking pressure on the wheel brake cylinder via the main brake cylinder, while the braking pressure on the wheel brake cylinder can be modulated by the auxiliary pressure circuit;
• the wheel brake circuit downstream of said first hydraulic connection point and the auxiliary pressure circuit both being free of any electromagnetically operated switching valve;
• and
• wherein the hydraulic pump is constructed to vary the volume flow so that by changing in a defined manner the conveying power of the hydraulic pump which, in the anti-lock operating phase, is operated continuously, hydraulic fluid can be withdrawn from the wheel brake circuit in a defined manner and thus the brake pressure can be modulated in the anti-lock operating phase without any electromagnetically operated switching valve.