The invention relates to a steer-by-wire steering system comprising a
hydraulic control unit that acts on the steerable wheels (1, 20), the
control unit having at least one cradle (4, 23), which is displaceably
mounted on at least one guide rod (5, 24) that passes through the
respective cradle (4, 23). The respective cradle (4, 23) and the
corresponding guide rod(s) (5, 24) form working chambers (A.sub.11,
A.sub.12, A.sub.21, A.sub.22) of a piston-cylinder system, whereby each
respective guide rod (5, 24) has at least one channel (KA.sub.11,
KA.sub.12, KA.sub.21, KA.sub.22), each terminating in the vicinity of a
working chamber (A.sub.11, A.sub.12, A.sub.21, A.sub.22). The cradle or
cradles (4, 23) adjust the steerable wheels (1, 20) directly or by means
of steering tie rods (2, 21).