Device and method for manufacturing wheel bearing assembly
The present invention relates to device and method for manufacturing a wheel bearing assembly that reduces an error rate by reducing stress concentrated on rolling elements in manufacturing processes of the wheel bearing assembly. The device for manufacturing a wheel bearing assembly may include: a base, on which a hub is mounted, supporting the hub in a case of orbital-forming; a forming tool mounting portion mounted above the base; a rotating portion rotatably connected to an outer ring and rotating or pivoting the outer ring about a hub axis in a case of the orbital-forming; and a forming tool mounted at the forming tool mounting portion, rotating on a first axis slanted to the hub axis by a predetermined angle, and simultaneously orbiting about a second axis parallel with the hub axis.
1. A device for manufacturing a wheel bearing assembly, which has a hub provided with one end engaged to a wheel of a vehicle and the other end forming a stepped portion and an end portion, an inner ring mounted on the stepped portion of the hub, an outer ring mounted at a vehicle body, and rolling elements interposed between the outer ring and the hub and the inner ring and orbital-forming the end portion of the hub radially outwardly toward the inner ring, the device comprising:
a base, on which the hub is mounted, supporting the hub in a case of orbital-forming;
a forming tool mounting portion mounted above the base;
a rotating portion rotatably connected to the outer ring and rotating or pivoting the outer ring about a hub axis in a case of the orbital-forming; and
a forming tool mounted at the forming tool mounting portion, rotating on a first axis slanted to the hub axis by a predetermined angle, and simultaneously orbiting about a second axis parallel with the hub axis.
2. The device of claim 1 , wherein the forming tool has a cylindrical shape, and a central axis of the forming tool is the same as the first axis.
3. The device of claim 1 , wherein a forming groove is formed at a lower end of the forming tool,
wherein the forming groove contacts the end portion of the hub in a case of the orbital-forming so as to form the end portion of the hub radially outwardly toward the inner ring.
4. The device of claim 1 , wherein the hub is provided with a flange protruded radially outwardly from one end of the hub and a bolt hole bored on the flange and engaging the wheel of the vehicle with the hub,
wherein the base is provided with a guiding hollow corresponding to the bolt hole, and
wherein a guiding pin is inserted in the bolt hole and the guiding hollow and guides the hub to have a predetermined movement in a case of the orbital-forming so as to reduce stress concentrated on the rolling elements.
5. The device of claim 4 , wherein the predetermined movement of the hub is caused by rotation of the guiding pin in the bolt hole.
6. The device of claim 4 , wherein the predetermined movement of the hub is upward or downward reciprocal motion of the hub within a predetermined range.
7. The device of claim 6 , wherein, in a case that the hub moves upwardly or downwardly, the forming tool also moves upwardly or downwardly.
8. The device of claim 1 , wherein the rotating portion comprises:
a driving unit generating torque;
a rotatable plate connected to and rotated by the driving unit; and
a driving link eccentrically connected to the rotatable plate, and rotatably connected to the rotatable plate and the outer ring so as to rotate or pivot the outer ring about the hub axis according to rotation of the rotatable plate.