Damper and driving unit of steering device having the same
An embodiment of the present invention relates to a damper installed in a driving unit of a steering device, and a damper which is installed in a driving unit of a steering device to buffer an impact of a worm shaft including a worm gear formed in one region and a bearing supporting a rotation of the worm shaft, including a first body including a first through hole formed therein through which the worm shaft passes, a second body coupled to the first body and including a second through hole through which the worm shaft passing through the first through hole passes, and a buffer member disposed between the first body and the second body.
1 . A damper which is installed in a driving unit of a steering device to buffer an impact of a worm shaft comprising a worm gear formed in one region and a bearing supporting a rotation of the worm shaft, the damper comprising:
a first body comprising a first through hole formed therein through which the worm shaft passes;
a second body coupled to the first body and comprising a second through hole through which the worm shaft passing through the first through hole passes; and
a buffer member disposed between the first body and the second body; and
a coupling portion comprising a first locking portion protruding toward the buffer member on the first body and a second locking portion formed on the second body to engage the first locking portion,
wherein the first locking portion comprises:
a first support member protruding toward the buffer member in a direction parallel to a central axis of the first through hole;
a first protrusion in which a region on the first support member protrudes toward a center of the first through hole; and
a first inclined portion formed to be inclined between one end of the first support member and the first protrusion.
2 . The damper according to claim 1 , wherein the second locking portion comprises:
a second support member protruding toward the buffer member in a direction parallel to a central axis of the second through hole; and
a second protrusion in which a region on the second support member protrudes in a direction away from a center of the second through hole and which is engageable with the first protrusion.
3 . The damper according to claim 2 , wherein the second locking portion further comprises a second inclined portion formed to be inclined between one end of the second support member and the second protrusion.
4 . The damper according to claim 1 , wherein one end of the first support member is spaced apart from the second body in a center direction of the first through hole.
5 . The damper according to claim 1 , wherein a length of the buffer member in a direction parallel to a longitudinal direction of the worm shaft is formed to be relatively longer than a length of the first support member from the first body in a direction parallel to a center direction of the first through hole.
6 . The damper according to claim 1 , wherein an outer diameter of the second body is formed to be relatively smaller than an outer diameter of the first body.
7 . A driving unit of a steering device which provides an auxiliary torque of the steering device and comprises a housing of the driving unit comprising an installation region formed therein, the driving unit of the steering device comprising:
a worm shaft disposed in the installation region and comprising a worm gear formed in one region;
a bearing rotatably supporting one side of the worm shaft; and
a damper comprising a first body comprising a first through hole formed therein so that the worm shaft passes through, a second body comprising a second through hole formed so that the worm shaft passing through the first through hole passes through, a buffer member disposed between the first body and the second body, and a coupling portion coupling the first body, the buffer member, and the second body to each other,
wherein the coupling portion comprises:
a first locking portion comprising a first support member protruding toward the buffer member in a direction parallel to a central axis of the first through hole, and a first protrusion in which a region on the first support member protrudes toward a center of the first through hole; and
a second locking portion comprising a second support member protruding toward the buffer member in a direction parallel to a central axis of the second through hole and a second protrusion in which a region on the second support member protrudes in a direction away from a center of the second through hole and which is engageable with the first protrusion.
8 . The driving unit of a steering device according to claim 7 , wherein the coupling portion is disposed so that an inner peripheral surface of the buffer member faces an outer periphery of the first support member.
9 . The driving unit of a steering device according to claim 7 , wherein a plurality of the first support members is disposed on the first body to be spaced apart from each other about the first through hole.
10 . The driving unit of a steering device according to claim 7 , wherein a plurality of the second support members is disposed on the second body to be spaced apart from each other around the second through hole.
11 . The driving unit of a steering device according to claim 7 , wherein in the coupling portion, the second protrusion is caught and engaged with the first locking portion in a direction parallel to a center of the first through hole.
12 . The driving unit of a steering device according to claim 11 , wherein the coupling portion maintains the coupling between the first body, the second body, and the buffer member even if the buffer member is varied in a direction parallel to a longitudinal direction of an axial direction of the worm shaft.
13 . A damper which is installed in a driving unit of a steering device to buffer an impact of a worm shaft comprising a worm gear formed in one region and a bearing supporting a rotation of the worm shaft, the damper comprising:
a first body comprising a first through hole formed therein through which the worm shaft passes;
a second body coupled to the first body and comprising a second through hole through which the worm shaft passing through the first through hole passes;
a buffer member disposed between the first body and the second body; and
a coupling portion comprising a first locking portion protruding toward the buffer member on the first body and a second locking portion formed on the second body to engage the first locking portion,
wherein the first locking portion comprises:
a first support member protruding toward the buffer member in a direction parallel to a central axis of the first through hole; and
a first protrusion in which a region on the first support member protrudes toward a center of the first through hole,
wherein the second locking portion comprises:
a second support member protruding toward the buffer member in a direction parallel to a central axis of the second through hole; and
a second protrusion in which a region on the second support member protrudes in a direction away from a center of the second through hole and which is engageable with the first protrusion.
14 . The damper according to claim 13 , wherein the first locking portion further comprises a first inclined portion formed to be inclined between one end of the first support member and the first protrusion.
15 . The damper according to claim 13 , wherein the second locking portion further comprises a second inclined portion formed to be inclined between one end of the second support member and the second protrusion.
16 . The damper according to claim 13 , wherein one end of the first support member is spaced apart from the second body in a center direction of the first through hole.
17 . The damper according to claim 13 , wherein a length of the buffer member in a direction parallel to a longitudinal direction of the worm shaft is formed to be relatively longer than a length of the first support member from the first body in a direction parallel to a center direction of the first through hole.