Tilt fixing device of vehicular steering column

1. A tilt fixing device of a vehicular steering column, comprising:

a tilt bracket having a tilt hole formed in a tilt support formed on an outer side of a distance bracket, a first threaded portion being formed on a first side surface of the tilt hole, a stepped portion being formed to protrude from a second side surface of the tilt hole, which faces the first side surface, so as to have a level difference with regard to the tilt support, and a second threaded portion being formed on the stepped portion;

a lever bolt coupled to an adjustment lever so as to rotate while interworking with the adjustment lever, the lever bolt being installed to penetrate the distance bracket and the tilt hole; and

a movable gear having an insertion hole formed to be penetrated by the lever bolt and having a movable threaded portion famed on an outer peripheral surface so as to be inserted into the tilt hole such that the movable threaded portion meshes with the first threaded portion and the second threaded portion and becomes fixed during tilt locking of the adjustment lever and, during tilt unlocking of the adjustment lever, the movable gear is spaced from the first threaded portion, meshes with the second threaded portion, and makes a rotational movement in a tilting direction.

2. The tilt fixing device of a vehicular steering column of claim 1 , wherein the movable threaded portion has threads and troughs foamed in a direction parallel with an axial direction of the lever bolt.

3. The tilt fixing device of a vehicular steering column of claim 2 , wherein the first threaded portion has threads and troughs foamed to mesh with a side of an outer peripheral surface of the movable threaded portion, and the second threaded portion has threads and troughs famed to mesh with a different side of the outer peripheral surface of the movable threaded portion while the first threaded portion and the movable threaded portion mesh with each other.

4. The tilt fixing device of a vehicular steering column of claim 3 , wherein the first threaded portion is foamed on a side of a post-shaped first member, and the first member is coupled to the first side surface of the tilt hole.

5. The tilt fixing device of a vehicular steering column of claim 3 , wherein the second threaded portion is fouled on a side of a post-shaped second member, and the second member is coupled to the stepped portion on the second side surface.

6. The tilt fixing device of a vehicular steering column of claim 3 , further comprising a support member installed on an outer side of the movable gear such that the lever bolt penetrates and is coupled to the support member, an end of the support member is supported on the tilt support, and a different end of the support member is coupled to the lever bolt by a lever nut.

7. The tilt fixing device of a vehicular steering column of claim 6 , wherein the support member has a first protruding end and a second protruding end provided to protrude from both ends of an inner surface of the support member toward the tilt support, respectively, the first protruding end is supported on an outer surface of the tilt support, and the second protruding end is supported on the stepped portion.

8. A tilt fixing device of a vehicular steering column, comprising:

a tilt bracket having an incision hole formed in a tilt support formed on an outer side of a distance bracket;

a gear member coupled to the incision hole, the gear member having a tilt hole formed in an inner side, an end of the gear member having a first threaded portion formed on a first side surface of the tilt hole, a stepped portion being formed to protrude from a second side surface of the tilt hole so as to have a level difference with regard to the tilt support, and a second threaded portion being fanned on the stepped portion;

a lever bolt coupled to an adjustment lever so as to rotate while interworking with the adjustment lever, the lever bolt being installed to penetrate the distance bracket and the tilt hole; and

a movable gear having an insertion hole formed to be penetrated by the lever bolt and having a movable threaded portion formed on an outer peripheral surface so as to be inserted into the tilt hole such that the movable threaded portion meshes with the first threaded portion and the second threaded portion and becomes fixed during tilt locking of the adjustment lever and, during tilt unlocking of the adjustment lever, the movable gear is spaced from the first threaded portion, meshes with the second threaded portion, and makes a rotational movement in a tilting direction.

9. The tilt fixing device of a vehicular steering column of claim 8 , wherein the movable threaded portion has threads and troughs formed in a direction parallel with an axial direction of the lever bolt.

10. The tilt fixing device of a vehicular steering column of claim 9 , wherein the first threaded portion has threads and troughs famed to mesh with a side of an outer peripheral surface of the movable threaded portion, and the second threaded portion has threads and troughs famed to mesh with a different side of the outer peripheral surface of the movable threaded portion while the first threaded portion and the movable threaded portion mesh with each other.

11. The tilt fixing device of a vehicular steering column of claim 10 , further comprising a support member installed on an outer side of the movable gear such that the lever bolt penetrates and is coupled to the support member, an end of the support member is supported on the tilt support, and a different end of the support member is coupled to the lever bolt by a lever nut.

12. The tilt fixing device of a vehicular steering column of claim 11 , wherein the support member has a first protruding end and a second protruding end provided to protrude from both ends of an inner surface of the support member toward the tilt support, respectively, the first protruding end is supported on an outer surface of the tilt support, and the second protruding end is supported on the stepped portion.