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Cylindrical vibration isolating device

  • US 8,167,286 B2
  • Filed: 04/16/2008
  • Issued: 05/01/2012
  • Est. Priority Date: 04/17/2007
  • Status: Active Grant
First Claim
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1. A cylindrical vibration isolating device, comprising:

  • an inner cylinder defining a center point, the center point being coaxially located within the inner cylinder so as to be equally spaced from all points of a perimeter of the inner cylinder,an outer cylinder surrounding said inner cylinder,an elastic leg having a pair of right and left leg portions connecting said inner cylinder and said outer cylinder and, when viewed in the axial direction of the inner cylinder, forming a substantially inverted V-shape with an apex point where the left leg portion joins the right leg portion, wherein a bisecting line connects the center point of the inner cylinder and the apex point of the elastic leg,an inner restrained portion connecting said inner cylinder and said elastic leg together,an outer restrained portion connecting said elastic leg with said outer cylinder, anda mass projection being provided in said elastic leg such that said mass projection resonates in a frequency range that said elastic leg causes bending resonance,wherein said mass projection is provided radially outside of an inner restraint line, said inner restraint line passing through a radially outermost point of the inner restrained portion and being parallel to the bisecting line,and wherein said mass projection is provided entirely radially outside of an outer parallel line such that the outer parallel line is between said mass projection and said inner restraint line, said outer parallel line extending parallel to the inner restraint line and passing through a lowermost point of the outer restrained portion.

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