Thermoplastic jounce bumpers

An automotive vehicle suspension system, comprising a jounce bumper installed on a suspension rod of a vehicle, wherein the jounce bumper is made of a copolyetherester, and wherein the jounce bumper comprises:

• 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 the peak and the trough, is greater than or equal to 1.5, and wherein the trough is defined by a wall arc having end points at said 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.