Structure and method for coupling wheel bearings

1. A structure for coupling a wheel bearing comprising:

a wheel hub formed of a flange for mounting a vehicle wheel;

a hollow inner ring press-fitted onto an end portion of the wheel hub;

an annular outer ring disposed at an outside of the wheel hub and the inner ring;

at least one rolling elements disposed between the wheel hub or the inner ring and the outer ring; and

a hollow pin splined to an interior circumference of the wheel hub and an interior circumference of the inner ring.

2. The structure of claim 1 , wherein a first spline is formed at the interior circumference of the wheel hub, a second spline is formed at an exterior circumference of the hollow pin, and a third spline is formed at the interior circumference of the inner ring, and

wherein the second spline is splined simultaneously with the first spline and the third spline.

3. The structure of claim 1 , wherein a first facial spline is formed radially at an end surface of the inner ring, and

wherein the structure further comprises a joint member formed of a second facial spline engaged with the first facial spline; and

a bolt penetrating through the hollow pin and coupling the joint member with the wheel hub.

4. The structure of claim 1 , wherein an end of the hollow pin is bent radially outwardly so as to form a supporting portion.

5. The structure of claim 4 , wherein the other end of the hollow pin is bent radially outwardly so as to form a bending portion.

6. The structure of claim 5 , wherein the bending portion is formed by orbital forming process.

7. The structure of claim 1 , wherein the end portion of the wheel hub has an interior circumference stepped radially outwardly so as to form a stepped portion, and the inner ring is formed of a press-fitted portion protruded in an axial direction so as to be press-fitted into the stepped portion.

8. The structure of claim 7 , wherein a diameter of an interior circumference of the stepped portion is smaller than that of an exterior circumference of the press-fitted portion.

9. A structure for coupling a wheel bearing comprising:

a wheel hub formed of a flange for mounting a vehicle wheel;

a hollow inner ring penetrating through and press-fitted into an interior circumference of the wheel hub;

an annular outer ring disposed at an outside of the wheel hub and the inner ring; and

at least one rolling element disposed between the wheel hub or the inner ring and the outer ring,

wherein a part of the inner ring penetrating through the wheel hub is splined to an interior circumference of the wheel hub,

wherein a first facial spline is formed radially at an end surface of the inner ring, and

wherein the structure further comprises a joint member formed of a second facial spline engaged with the first facial spline; and

a bolt penetrating through the inner ring and coupling the joint member with the wheel hub.

10. The structure of claim 9 , wherein a first spline is formed at an interior circumference of the wheel hub, a second spline splined to the first spline is formed at a part of the inner ring, a press-fitted portion protruded in an axial direction so as to be press-fitted into the wheel hub is formed at other portion than the second spline of the inner ring.

11. The structure of claim 9 , wherein a boundary portion where an exterior circumference of the inner ring and the interior circumference of the wheel hub contacts with each other is welded such that preload applied to the wheel hub is maintained.

12. A method for coupling a wheel bearing comprising:

forming a stepped portion stepped radially outwardly at an interior circumference of an end portion of a hollow wheel hub having a flange for mounting a vehicle wheel;

forming a press-fitted portion at an inner ring, the press-fitted portion being protruded in an axial direction so as to be press-fitted into the stepped portion;

forming a first spline at an interior circumference of the wheel hub, forming a second spline at an exterior circumference of a hollow pin inserted into the wheel hub and the inner ring, and forming a third spline at an interior circumference of the inner ring;

coupling the inner ring to the wheel hub by press-fitting the press-fitted portion into the stepped portion; and

inserting the hollow pin into the wheel hub and the inner ring so as for the second spline to be splined to the first spline and the third spline simultaneously.

13. The method of claim 12 , further comprising:

forming a first facial spline radially at an end surface of the inner ring and forming a second facial spline engaging with the first facial spline at a joint member;

mounting the joint member to the inner ring so as to engage the first facial spline and the second facial spline; and

inserting a bolt into the hollow pin and coupling the bolt to an engaging groove of the joint member.

14. A method for coupling a wheel bearing comprising:

forming a first spline at a part of an interior circumference of a hollow wheel hub having a flange for mounting a vehicle wheel;

forming an inner ring to penetrate through the wheel hub, wherein a second spline splined to the first spline is formed at a part of the inner ring;

forming a press-fitted portion at other part of the inner ring, the press-fitted portion being protruded in an axial direction so as to be press-fitted into the wheel hub; and

assembling the inner ring and the wheel hub by press-fitting the press-fitted portion into the wheel hub and splining the first spline with the second spline.

15. The method of claim 14 , further comprising:

forming a first facial spline radially at an end surface of the inner ring and forming a second facial spline engaging with the first facial spline at a joint member;

mounting the joint member to the inner ring so as to engage the first facial spline and the second facial spline; and

inserting a bolt into a hollow space of the inner ring and coupling the bolt to an engaging groove of the joint member.