Driving unit of steering apparatus
The present disclosure provides a driving unit of a steering apparatus configured to provide an auxiliary torque of a steering apparatus and including a driving housing having an installation region formed therein, and the driving unit includes a worm shaft disposed in the installation region and having a worm gear formed therein, a first bearing rotatably supporting one side of the worm shaft, a damper penetrating and supporting one side of the worm shaft supported by the first bearing, and a stopper penetrating and supporting one side of the worm shaft passing through the damper, one end of the stopper being spaced apart from the damper so that a movement of the damper is limited in an axial direction of the worm shaft.
1 . A driving unit of a steering apparatus configured to provide an auxiliary torque of a steering apparatus and including a driving unit housing having an installation region formed therein, the driving unit comprising:
a worm shaft disposed in the installation region and having a worm gear formed therein;
a first bearing rotatably supporting one side of the worm shaft;
a damper having a damper support through hole into which the one side of the worm shaft supported by the first bearing is inserted; and
a stopper having a stopper through hole into which the one side of the worm shaft passing through the damper is inserted, one end of the stopper being spaced apart from the damper so that a movement of the damper is limited in an axial direction of the worm shaft,
wherein the damper includes:
a first damper support supporting a side surface of the bearing and having the damper support through hole; and
a buffer section disposed between the first damper support and the stopper to relieve an impact of the worm shaft in the axial direction and having a buffer section through hole into which the one side of the worm shaft is inserted, and
wherein the stopper includes:
an annular body formed in an annular shape and having the stopper through hole; and
a protrusion having one end disposed to be spaced apart from the first damper support and extending from the annular body toward the bearing, wherein the protrusion surrounds a region of an outer peripheral surface of the buffer section, and a plurality of the protrusions are formed on the annular body.
2 . The driving unit of claim 1 , further comprising a snap ring configured to support the stopper by the driving unit housing.
3 . The driving unit of claim 2 , wherein the driving unit housing includes a snap ring groove formed concavely so that a portion of an outer periphery of the snap ring is inserted and supported.
4 . The driving unit of claim 1 , wherein the damper is disposed between the bearing and the stopper.
5 . The driving unit of claim 1 , wherein one region of the protrusion facing an inner peripheral surface of the installation region has a curved surface.
6 . The driving unit of claim 1 , wherein a length of the protrusion parallel to the axial direction of the worm shaft is shorter than the length of the buffer section parallel to the axial direction of the worm shaft.
7 . The driving unit of claim 1 , further comprising:
a second bearing rotatably supporting an other side of the worm shaft; and
an auxiliary damper disposed between the driving unit housing and the second bearing to cushion an axial impact of the worm gear.