A power-assisted steering system for the self-steering wheels of one or more rear axles of a motor vehicle such as a truck, trailer and semi-trailer for steering the vehicle during backing

摘要

A system for steering, during backing, the self-steering wheels (3, 4) of at least a rear axle (27) of a motor vehicle equipped with power-assisted steering on a front axle (7), comprising a double-action hydraulic actuator (31) which acts on the self-steering rear wheels (3, 4) and is connected to a hydraulic pressure source (37, 38) by a servocontrolled distributor (44) which is actuated by a traction element of the flexible-cable type (47), which is connected to the steering system (13-15) of the front axle (7) so as to direct the rear wheels (3, 4) in the steering direction and by the desired extent in proportion to the steering of the front wheels (1, 2).