| 摘要 |
An energy absorbing device particularly adapted for automotive applications and functional in a first mode to damp the primary suspension spring of the vehicle and in a second mode to absorb the energy of impact on the bumper bar of the vehicle, the device including a composite tube assembly rigidly supported on the vehicle sprung mass portion, a support tube telescopically supported on the composite tube assembly and rigidly attached to the bumper bar, a double headed free piston slidably disposed in the composite tube assembly, and a link system connecting the unsprung mass portion of the vehicle to the piston. During compression and expansion deflections of the unsprung mass portion, the link system effects bodily movement of the piston which initiates throttled flow of a working medium between a pair of variable volume chambers to damp a primary suspension spring. When the bumper bar is impacted, the free piston is held fixed and the support tube collapses to effect throttled flow of the working medium through an orifice which traverses the length of a third chamber thereby to absorb the energy of impact on the bar.
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