Patent ID: 9689454
Date: 2017-06-27
CPC Classifications: F16F

Claim:
1. A frequency tuned damper being attached to a vibrating surface, vibrations of which are to be dampened and comprise different vibration frequencies in two different directions of the vibrating surface, said damper comprising: a vibration body; and at least one elastic element by which the vibration body is attached to the vibrating surface, wherein: the elastic element has a wide portion and a narrow portion disposed at different locations along a longitudinal axis of the elastic element which is substantially parallel with the normal of the vibrating surface, the elastic element is attached to the vibration body by one of said wide portion and said narrow portion and attached to the vibrating surface by the other one of said wide portion and said narrow portion, the wide portion has a cavity, the elastic element includes: the first circumferential mounting groove extends in a closed loop in a plane parallel with the vibrating surface along an elongated path, such that the closed loop deviates from a circular shape and has different extensions in two perpendicular directions in said plane, said elastic element has different resonant frequencies in said two perpendicular directions, said first mounting groove is fitted in an opening having a shape that corresponds to the first mounting groove for correctly orienting the elastic element around said longitudinal axis, and the elastic element further includes a transition portion defining a wall which interconnects the wide portion and the narrow portion of the elastic element, and the thickness of the wall of the transition portion varies along the circumferential periphery of the elastic element at a given location of the longitudinal axis for adjusting said resonant frequencies of the frequency tuned damper to said different vibration frequencies of the vibrating surface.