Safety belt retractor having a rotation dampener

A safety belt retractor as a safety system in motor vehicles, comprising:

• a U-shaped housing;
• a belt shaft mounted in the U-shaped housing and serving as a carrier for a belt strap wound thereon;
• a rotation dampener, as a force limiting element, that acts upon said belt shaft, wherein said rotation dampener comprises:
• a) a cylindrical housing filled with a highly viscous medium;
• b) at least one apertured disk fixedly disposed in said cylindrical housing;
• and
• c) at least one disk piston disposed in said cylindrical housing parallel to said apertured disk, wherein said at least one disk piston is fixedly connected to said belt shaft the rotation of which is to be dampened, and wherein at least one disk piston is provided with a radially extending piston ring that rotates upon rotation of said at least one disk piston.