| 摘要 |
A piston arrangement for a shock absorber. A piston rod has a piston mounted on it, the piston being axially non-displaceable with respect to the piston rod. The piston has flow channels through which a damping medium may flow when the piston is axially displaced in the shock absorber. There are two valves for controlling the flow of medium when the piston is moved in opposite axial directions, respectively, each of which valves has a valve element that opens against a spring force, depending on the direction of axial movement of the piston and therefore on the direction of flow of the medium. This closure element of one of the valves includes a disc while the closure element of the other valve includes a sleeve which surrounds the piston rod. The sleeve has a flange which is exposed to the pressure of the medium when the valve is opened. This piston rod itself has a region of reduced diameter, part of which region is in axial alignment with the disc. The sleeve and disc form a space between themselves. The sleeve extends overlappingly through at least the reduced-diameter region of the piston. The one valve itself has a valve element associated with the disc and a spring which acts on this valve element. The valve element tightly surrounds the sleeve but permits axial movement relative thereto. The valve element has a second valve seat near its inner circumference and, under the influence of the spring, presses the disc near its outer circumference against a step of the piston.
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