Sealing part structure of hydraulic power steering apparatus
Disclosed is a sealing part structure of a cylinder tube disposed in a hydraulic power steering apparatus. The sealing part structure includes an oil seal for preventing leakage of power steering oil; a DU bushing for guiding a reciprocal movement of a rack bar in a leftward and rightward direction; a rack bush for absorbing a shock from a piston disposed in the rack bar; a stop ring for fixing the rack bush to a cylinder tube. According to the present invention, the number of parts is reduced, thereby simplifying an assembling process as well as reducing a manufacturing cost thereof so as to improve productivity.
1 . A sealing part structure of a cylinder tube disposed in a hydraulic power steering apparatus, the sealing part structure comprising:
an oil seal for preventing leakage of power steering oil;
a DU bushing for guiding a reciprocal movement of a rack bar in a leftward and rightward direction;
a rack bush for absorbing a shock from a piston disposed in the rack bar; and
a stop ring for fixing the rack bush to a cylinder tube.
2 . The sealing part structure as claimed in claim 1 , wherein the rack bush has a groove formed in an outer circumferential surface of the rack bush, so as to enable the stop ring to be inserted into the rack bush.
3 . The sealing part as claimed in claim 2 , wherein the rack bush has an opening formed in a part of the outer circumferential surface in which the groove is formed, so as to assemble/separate the stop ring in/from the groove.