Patent ID: 7661663

Claim:
A vibration damper comprising: a damper tube filled with a damping medium; a piston rod which can move in an oscillating and reciprocal manner in the damper tube, and the piston rod having one end which protrudes into the damper tube and which comprises at said one end a piston rod extension and a shoulder; a piston which divides an interior of the dumper tube into a working chamber remote from the piston rod and a piston rod-side working chamber and which is disposed coaxially with respect to the piston rod extension, the piston defining restrictor openings communicating with the working chamber and the piston rod-side working chamber; at least one spring washer adjacent the restrictor openings and disposed in the piston rod-side working chamber; a buffer spring disposed in the piston rod-side working chamber; and a spring collar which is disposed in the piston rod-side working chamber and has a first support surface supporting the buffer spring and a second support surface for the spring washer disposed in the piston rod-side working chamber, the spring collar comprising a stepped bore which has a first bore section having a small diameter and a second bore section having a larger diameter, wherein the first bore section is allocated to the piston rod extension and the second bore section is allocated to the end of the piston rod, and the spring collar is rigidly connected to the piston rod in a fixed manner in a first axial direction from the piston rod to the piston rod extension so that a force exerted by the buffer spring onto the spring collar in the first axial direction is introduced directly into the piston rod without transmission through the piston.