moved through passage openings 58 60 whereby subject to the pressure of the fluid the small spring plates 62 64 open damping openings 58 60 and enable the overflow of oil from first chamber 52 into second chamber 54 the oil moreover flows from first chamber 52 through the interior 70 of piston rod 48 as well as damping openings 90 and 92 into second chamber 54 upon rising gas pressure in chamber 30 control rod 76 moves increasingly toward first chamber 52 so that damping opening 90 is initially closed and in this position oil from first chamber 52 can only overflow into second chamber 54 through damping openings 58 60 as well as damping opening 92 upon relieving of spring damper system 1 upon the rebound damping of spring damper system 1 respectively the spring damper system slackens as schematically indicated by arrows 98 100 in so doing the volume in chamber 30 which had been decreased due to the pressure load now increases so that the gas pressure in chamber 30 drops upon this decreasing gas pressure control rod 76 is relieved such that especially due to the effect of spring 82 it moves in the direction opposite first chamber 52 and thus damping openings 90 92 are.