Patent ID: 8657271

Claim:
A jounce bumper made of elastomeric thermoplastic material, comprising: a hollow elongated tubular body having a wall, the tubular body having at least two bellows, each bellow being defined by a peak and a trough, the peak having a fillet radius of rs, the trough having a fillet radius of rc and a maximum wall thickness in the trough of Tmax; wherein rc is greater than rs, and wherein the ratio of Tmax, the maximum thickness of the wall in a trough to Tm, the thickness of the wall at intermediate points between peaks and troughs, is greater than or equal to 1.5, wherein the trough is defined by a wall arc having end points at said intermediate points where the wall thickness is Tm; wherein each of said intermediate points is a point of tangency between a circle of radius rc and a circle of radius rs, or if rs and rc are not tangent, Tm is the wall thickness wherein each of said intermediate points is a midpoint of a line drawn tangent to circles rs and rc; and wherein the force required to compress said jounce bumper to 50 percent relative deformation is at least 14 percent greater than the force required to compress a jounce bumper to 50 percent relative deformation which does not have a ratio of Tmax to Tm of greater than or equal to 1.5.