Vibration absorption device for a head-up display driving module
A vibration absorption device for a head-up display driving module, the device comprising: a power generation unit disposed at one end of the driving module and configured to generate rotational force using a motor fixed through a motor mount; and a cantilever-type dynamic absorber coupled to opposite ends of the motor mount to absorb vibration of the power generation unit.
1 . A vibration absorption device for a head-up display driving module, the vibration absorption device comprising:
a power generation unit disposed at one end of the head-up display driving module and configured to generate rotational force using a motor fixed through a motor mount; and
a cantilever-type dynamic absorber coupled to opposite ends of the motor mount to absorb vibration of the power generation unit,
wherein the cantilever-type dynamic absorber comprises a cantilevered extension portion of a fastening member, which extension portion extends in a cantilevered manner, beyond a location where the fastening member fastens a damper to the motor mount, to absorb vibration of the power generation unit.
2 . The vibration absorption device of claim 1 , further comprising:
a vibration damping unit including a damper mount disposed at an upper side of the motor mount and the damper fitted into an open hole formed in the damper mount,
wherein:
the damper mount and the damper are coupled to the upper side of the motor mount by the fastening member that includes a threaded portion which extends through the damper and the open hole formed in the damper mount;
the vibration damping unit includes a nut that is attached to the threaded portion of the fastening member so that the fastening member and the nut hold the damper mount to the upper side of the motor mount; and
the cantilever-type dynamic absorber comprises the cantilevered extension portion which extends from the threaded portion of the fastening member in a cantilevered manner by a predetermined distance L 1 , beyond a location where the nut is attached to the threaded portion.
3 . The vibration absorption device of claim 2 , wherein:
the motor mount includes an upper motor mount disposed at an upper side of the motor, and
the cantilever-type dynamic absorber is coupled to each of two or more through-holes formed in opposite end portions of the upper motor mount in a first direction.
4 . The vibration absorption device of claim 3 , comprising a plurality of the cantilever-type dynamic absorbers, and the through-holes are radially arranged with respect to a rotating shaft of the motor so that the cantilever-type dynamic absorbers are arranged at regular angular intervals.
5 . The vibration absorption device of claim 1 , wherein the cantilever-type dynamic absorber has a preset mass and a preset stiffness, and is formed to extend in a first direction so that a target frequency of the cantilever-type dynamic absorber corresponds to a natural frequency of the power generation unit.
6 . The vibration absorption device of claim 5 , wherein the cantilever-type dynamic absorber is coupled to the motor mount through a fastening member, and the target frequency is determined by varying a length of the fastening member.