ELECTRIC TILT STEERING APPARATUS FOR VEHICLE
An electric tilt steering apparatus for a vehicle can reduce the vibration and noise generated by the axial and radial clearance between a tilt screw and surrounding parts supporting the tilt screw, so as to maintain the rigidity and improve the durability. Further, the electric tilt steering apparatus according to the present invention can simplify the assembling process, reduce the assembling steps, and provide a driver with a comfortable operation feeling during the tilt operation.
1 . An electric tilt steering apparatus comprising:
a tilt housing in which a worm wheel reducer and a tilt screw for tilt operation are mounted, the tilt housing being assembled with an electric motor;
a supporting member having an inner circumference coupled with the tilt screw and an outer circumference supported by an inner side of the tilt housing;
a first bearing disposed between a first side of the worm wheel reducer and the supporting member;
a second bearing tightly fitted around the tilt screw at a second side of the worm wheel reducer; and
a fastening member supporting an end of the second bearing and coupled with an inner part of the tilt housing.
2 . An electric tilt steering apparatus comprising:
a tilt housing in which a worm wheel reducer and a tilt screw for tilt operation are mounted, the tilt housing being assembled with an electric motor;
a first bearing having a first side surface supported by an outer side of the tilt housing and coupled with an outer circumference of the tilt housing;
a holding member supporting a second side surface of the first bearing and coupled with an end part of the tilt screw;
a supporting member disposed between the first bearing and the worm wheel reducer and having an inner circumference coupled with the tilt screw and an outer circumference supported by an inner side of the tilt housing;
a second bearing tightly fitted around the tilt screw at one side of the worm wheel reducer opposite to the first bearing; and
a fastening member supporting an end of the second bearing and coupled with an inner part of the tilt housing.
3 . The electric tilt steering apparatus as claimed in claim 2 , wherein the holding member is screw-assembled with the tilt screw, so as to adjust a supporting force for supporting the second side surface of the first bearing.
4 . The electric tilt steering apparatus as claimed in claim 1 or 2 , wherein the first bearing is a thrust bearing.
5 . The electric tilt steering apparatus as claimed in claim 1 or 2 , wherein the second bearing is a ball bearing.
6 . The electric tilt steering apparatus as claimed in claim 1 or 2 , wherein the fastening member has a shape of a partly-cutout ring, and is in tight contact with and coupled with an inside of the tilt housing by an elastic force in a radial direction of the ring-shaped fastening member.