Damper for electric power steering
A damper for electric power steering disposed on each of opposite ends of a worm shaft includes a rubber unit made of a rubber material, and a damper frame disposed on each of opposite sides of the rubber unit. The rubber unit includes a concave part which is concavely formed by forming a groove on an outer circumference thereof, and a convex part which is a convex remaining part.
1. A damper for electric power steering, the damper comprising:
a rubber unit made of a rubber material; and
a damper frame disposed on each of opposite sides of the rubber unit,
wherein the rubber unit comprises a concave part which is concavely formed by forming a groove on an outer circumference thereof, and a convex part which is a convex remaining part,
wherein the damper is disposed on each of opposite ends of a worm shaft,
wherein a direction in which the opposite ends of the worm shaft are extending is defined as an axial direction, and
wherein a width of the concave part in the axial direction is smaller than a width of the convex part in the axial direction.
2. The damper of claim 1 , wherein the concave part of the rubber unit is formed to be parallel to the damper frame.
3. The damper of claim 2 , wherein the concave part is formed in plural number.
4. The damper of claim 1 , wherein the concave part of the rubber unit includes a thread having a whirlwind shape.
5. The damper of claim 1 , wherein the concave part is first compressed and deformed when load is applied thereto.
6. The damper of claim 5 , wherein a compressive deformation amount is reduced according to an increase in load after neighboring convex parts contact each other as the applied load increases.