Patent ID: 8640835
Filing Date: 2014-02-04
Classification: F16F

Abstract:
1. A suspension unit comprising: a liquid-filled cylinder; a piston slidable within the liquid-filled cylinder; a piston rod having a gas-filled hollow interior, the piston being connected to the piston rod for displacement relative to the piston rod between extended and retracted end positions, and being resiliently biased towards one of the end positions; a moveable secondary piston slidably disposed within the gas-filled hollow interior of the piston rod, the piston being connected to the secondary piston such that the piston and the secondary piston are constrained to move together; and damping means for damping displacement of the piston relative to the piston rod towards at least one of the end positions, the damping means comprising a first damping chamber filled with liquid fluid defined within the liquid-filled cylinder between the piston and the piston rod, so as to vary in volume with relative movement between the piston and the piston rod, a second damping chamber filled with liquid fluid defined within the piston rod between the secondary piston and an end wall of the piston rod, and at least one restrictor controlling a flow rate of the liquid fluid between the first and second damping chambers.