The present invention relates to a rack assist type electric power steering
system, and in particular to an improved rack assist type electric power
steering system which is capable of decreasing a processing section of a
ball screw by improving an installation position and structure of a ball
screw, protecting a connector and sensor of a motor assembly from a heat
source and preventing any interference of parts due to a drooping of a
rack bar. The system according to the present invention includes a rack
bar, an input shaft, a rack housing, a torque sensor which surrounds an
upper surrounding portion of the input shaft and is fixed to an upper
portion of the rack housing; a second rack housing which surrounds the
straight line section of the rack bar and contacts by a bush inserted into
an inner diameter portion of the same, and a motor assembly.
