Braking system for electrically driven vehicles

In an electrically driven vehicle equipped with a front and a rear axle (14), two front wheels (8), two rear wheels (9), an electric motor (17) on each wheel (8,9), a combined electric-hydraulic brake system for regulating a braking action which comprises:

• disc brakes (16) located on said front and rear axles, corresponding to each of said front and rear wheels, pads (6,7) located on each of said disc brakes, a hydraulic control cylinder (1), having a pedal (2) for activating said control cylinder, said pedal having a switch (3) for lighting stop lights;
• said hydraulic control cylinder (1) forming a hydraulical front brake circuit (4) and a rear brake circuit (5), each of said circuits (4) and (5) connecting said control cylinder (1) to said pads (6,7);
• a delay valve (10) located on each of said hydraulic circuits (4,5), said control cylinder (1) exerting pressure through said pedal (2) on side delay valve (10), an electric bypass valve (11) located on each of said hydraulic circuits (4,5), said electric bypass valve being connected to said delay valve (10), electronic control units (13) connected to said electric motors and operating said electric motors units, said electronic control units actuating said electric bypass valves (11), a pressure sensor (12) connected to said hydraulic control cylinder (1) for detecting the pressure applied to said pedal (2) and signaling said electronic control units (13) in proportion to the pressure sensed to control the electric motors (17) to act as brakes on said wheels (8,9), a proportioning valve (19) located on said rear hydraulic circuit (5), said proportioning valve reducing the pressure to said rear circuit (5) whereby said pressure on the rear hydraulic circuit (5) differs from the pressure applied to said front hydraulic circuit (4).