Power steering apparatus of vehicle

1. A power steering apparatus of a vehicle, comprising:

a rack housing configured to surround a rack bar and having an opening portion formed at one side thereof through which a steering shaft passes, wherein a fastening portion protrudes from the outer circumferential surface of the opening portion and has a fastening hole formed therein to which a fastening member is screw-coupled;

a torque sensor cover that has a torque sensor therein and has a communicating hole formed therein through which the steering shaft passes and a first penetration portion having a first through-hole formed therein through which the fastening member passes, wherein the first penetration portion is provided to correspond to the fastening hole; and

a cover connecting member that has an insertion portion and a second penetration portion in order to connect the rack housing and the torque sensor cover, the insertion portion having an insertion hole formed therein where the opening portion is inserted and coupled and the second penetration portion having a second through-hole that is formed therein to correspond to the fastening hole and through which the fastening member passes, wherein the cover connecting member has the outer periphery formed in a shape corresponding to the outer periphery of the torque sensor cover and protrudes toward the torque sensor cover such that the torque sensor cover is coupled thereto.

2. The power steering apparatus of the vehicle of claim 1 , wherein two or more fastening portions protrude from the outer circumferential surface of the opening portion, each of which has the fastening hole formed therein, and two or more first penetration portions, second penetration portions, first through-holes, and second through-holes are formed to correspond to the fastening portions and the fastening holes.

3. The power steering apparatus of the vehicle of claim 1 , wherein the rack housing has a pinion opening portion formed on an opposite side thereof through which a pinion shaft passes.

4. The power steering apparatus of the vehicle of claim 1 , wherein a housing sealing member is coupled between the outer circumferential surface of the opening portion and the inner circumferential surface of the insertion portion while being compressed.

5. The power steering apparatus of the vehicle of claim 4 , wherein a groove is concavely formed on the outer circumferential surface of the opening portion, or on the inner circumferential surface of the insertion portion, in the circumferential direction such that the housing sealing member is coupled to the groove.

6. The power steering apparatus of the vehicle of claim 1 , wherein the second penetration portion and the insertion portion protrude toward the rack housing, a first stepped mounting portion is formed around the fastening hole on the distal end portion of the fastening portion, and a second stepped mounting portion is formed on the end portion of the fastening portion, which is directed toward the opening portion, around the opening portion.

7. The power steering apparatus of the vehicle of claim 1 , wherein the fastening portion has a first reinforcing portion having a gradually increasing width and a second reinforcing portion having a gradually increasing thickness from the distal end of the fastening portion toward the opening portion.

8. The power steering apparatus of the vehicle of claim 1 , wherein the second through-hole is formed larger than the fastening hole such that the fastening member easily passes through the second through-hole.