| 摘要 |
The invention relates to a piston device for a vehicle brake system, in particular for a pedal simulation apparatus of a vehicle brake system, having a piston shank extending in the direction of a longitudinal axis and having a radially extending piston disk formed on said piston shank, wherein the piston disk has a radially outer region, in which an outwardly open radial groove is formed, and wherein sealing means are or may be accommodated in the radial groove. In the invention it is further provided that the sealing means comprise a flexible sealing ring, which is or may be accommodated with axial and radial clearance in the radial groove, that the outside diameter of the sealing ring exceeds the outside diameter of the piston disk and that the piston disk is provided with at least one vent hole opening into the radial groove.
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