| 摘要 |
PURPOSE: A tube-type dynamic damper is provided to increase the efficiency of a fixing work by fixing the damper to a driving shaft with pressure expanded and generated by the pressure of air and fluid injected into a space unit in the damper and to minimize resonance phenomenon with optimally adjusting weight or mass to the changed RPM(Revolution per Minute) and rotational speed by moving the gas and fluid injected into the space unit in proportion to the centrifugal force generated in rotating the driving shaft. CONSTITUTION: A tube-type dynamic damper(600) includes a damper body with a doughnut-shape space unit(620) of which a side gets narrower inward and closely contacted and fixed to a driving shaft(400) by the pressure of gas(650) and fluid(640) injected through an injection port(630) into the space unit and increases and decreases mass by moving outward the fluid injected in the space unit by the centrifugal force of the driving shaft. The injection port has a leakage preventing valve unit, which is integrally inserted into a side of the outer periphery of the damper body.
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