Patent ID: 8757303

Claim:
A suspension unit comprising: a resilient arrangement comprising: a chamber having a primary volume arranged to contain a primary fluid; jounce and rebound variable volumes arranged to contain jounce and rebound fluids respectively; a piston slidably disposed in the chamber so as to act on the primary fluid; a jounce moveable member which separates the primary and jounce volumes and which is moveable so as to alter the jounce variable volume; a rebound moveable member which separates the primary and rebound volumes and which is moveable so as to alter the rebound variable volume; a jounce abutment member arranged to limit the movement of the jounce moveable member so as to define the maximum volume of the jounce variable volume; and a rebound abutment member spaced apart from a fixed end wall defining the rebound variable volume, said rebound abutment member being arranged to limit the movement of the rebound moveable member so as to define the minimum volume of the rebound variable volume; wherein when in use and the piston is in a static position the jounce moveable member abuts the jounce abutment member and the rebound moveable member abuts the rebound abutment member over a temperature range; and wherein the primary volume contains a primary fluid and the jounce and rebound volumes contain jounce and rebound fluids respectively, and wherein the pressures of the fluids are set such that when the piston is in the static position, the force generated by the static pressure of the primary fluid acting on the rebound moveable member is higher than the force generated by the pressure of the rebound fluid acting on the rebound moveable member and the force generated by the static pressure of the primary fluid acting on the jounce moveable member is lower than the force generated by the pressure of the jounce fluid acting on the jounce moveable member over a temperature range.