Rack bar supporting device of steering apparatus for vehicle

1. A rack bar supporting device of a steering apparatus for a vehicle, comprising:

a support yoke configured to be inserted into a cylinder of a gear box to support a rack bar;

a first cam member configured to have a front surface supporting the support yoke toward the rack bar and to have a rear surface provided with a first cam surface inclined in a circumferential direction thereof;

a second cam member configured to have a front surface provided with a second cam surface inclined in a circumferential direction thereof to correspond to the first cam surface, to have a rear surface to which one end of a torsion spring is supported and coupled, and to have an outer circumferential surface provided with an outer circumferential groove formed in an axial direction thereof;

a yoke plug configured to have an inner front surface to which the other end of the torsion spring is supported and coupled to be coupled to the cylinder and to be provided with an insertion hole communicating with the outer circumferential groove; and

an elastic pin configured to be inserted into the outer circumferential groove and the insertion hole so that the torsion spring is maintained in a compressed state.

2. The rack bar supporting device of claim 1 , wherein a first engagement portion to which the one end of the torsion spring is supported and coupled is provided on the rear surface of the second cam member, and a second engagement portion to which the other end of the torsion spring is supported and coupled is provided on the inner front surface of the yoke plug.

3. The rack bar supporting device of claim 1 , wherein the second cam member, the torsion spring, and the yoke plug are integrally coupled by the elastic pin coupled to the outer circumferential groove and the insertion hole, to form a first module.

4. The rack bar supporting device of claim 3 , wherein an elastic member for elastically supporting the support yoke is provided on the front surface of the first cam member.

5. The rack bar supporting device of claim 4 , wherein the elastic member is formed in an annular shape tapered from an inner diameter portion thereof toward an outer diameter portion thereof, and is disposed on the front surface of the first cam member.

6. The rack bar supporting device of claim 5 , wherein a supporting member for supporting the elastic member is provided on the front surface of the elastic member, and a coupling hole is provided at central portions of the supporting member and the first cam member so that the first cam member, the elastic member, and the supporting member are integrally coupled by a coupling member coupled to the coupling hole, to form a second module.

7. The rack bar supporting device of claim 6 , wherein an insertion groove into which a head portion of the coupling member is inserted is provided on the rear surface of the support yoke.

8. The rack bar supporting device of claim 7 , wherein the first cam member is provided with a communication hole which passes through the front surface and the rear surface and communicates with the outer circumferential groove, so that the elastic pin is coupled to the insertion hole, the outer circumferential groove, and the communication hole to combine the first module and the second module.

9. The rack bar supporting device of claim 1 , wherein the elastic pin is provided with an elastic damping member between pin members provided on both sides in a radial direction thereof so as to be elastically deformable in the radial direction.

10. The rack bar supporting device of claim 1 , wherein a guide protrusion formed in the axial direction is provided on an inner surface of an end of the yoke plug, and a guide groove inserted into the guide protrusion is provided on the outer circumferential surface of the first cam member.

11. A rack bar supporting device of a steering apparatus for a vehicle, comprising:

a support yoke configured to be inserted into a cylinder of a gear box to support a rack bar;

a first cam member configured to have a front surface supporting the support yoke toward the rack bar and to have a rear surface provided with a first cam surface inclined in a circumferential direction thereof;

a second cam member configured to have a front surface provided with a second cam surface inclined in a circumferential direction thereof to correspond to the first cam surface, to have a rear surface to which one end of a torsion spring is supported and coupled, and to have a through-hole passing through the front surface and the rear surface;

a yoke plug configured to have an inner front surface to which the other end of the torsion spring is supported and coupled to be coupled to the cylinder and to be provided with an insertion hole communicating with an outer circumferential groove; and

an elastic pin configured to be inserted into the through-hole and the insertion hole so that the torsion spring is maintained in a compressed state.

12. The rack bar supporting device of claim 11 , wherein the elastic pin is provided with an elastic damping member between pin members provided on both sides in a radial direction thereof so as to be elastically deformable in the radial direction.

13. The rack bar supporting device of claim 1 , wherein at least one end of the torsion spring extends in a radial direction which is perpendicular to the elastic pin.

14. The rack bar supporting device of claim 11 , wherein at least one end of the torsion spring extends in a radial direction which is perpendicular to the elastic pin.

15. The rack bar supporting device of claim 1 , wherein the rear surface of the second cam member has a stepped shape coupled to the one end of the torsion spring.

16. The rack bar supporting device of claim 11 , wherein the rear surface of the second cam member has a stepped shape coupled to the one end of the torsion spring.