| 摘要 |
An hydraulic power braking system (10) for a tractor vehicle (11) and trailer (12) has an automatic electro-hydraulic disengagement brake for the trailer. Brake lights (71), the magnet (35) of a valve (21) on the trailer (12), and a charging indicator light (63) are connected in current circuits which only pass through three contacts (45, 46, 47) of a multi-pole electrical plug-in coupling (43). All the circuits of the three loads (71, 35, 63) are associated, at least periodically, with the contact (47), whereas the remaining contact (46) not associated with the earth conductor can be connected to both poles (52, 49) of a battery (51) through a double switch (55) actuated by a brake pedal (13). Whereas the brake lights (71) illuminate with each actuation of the brake pedal (13), the charging indicator light (63) is only switched on during the various operating conditions when the hydraulic accumulator (25) is being relieved. The usual standard seven pole plug-in coupling used on tractors can be retained with the present disengagement brake. <IMAGE> |
