A steer-by-wire system with a fail-safe mechanism is disclosed in which a clutch
for the steer-by-wire system installed between a first shaft connected to a steering
wheel and a second shaft connected to a steering gear is formed as a mechanism
for bringing about wedgelike engagement of taper rollers by simple operation of
turning an operating lever, so that when an abnormality detection sensor detects
a defect in the steer-by-wire system, the clutch is operated through a clutch switching
actuator to interconnect the first and second shafts and so as to make it possible
to directly steer the steering gear.
