| 摘要 |
A motor vehicle seat belt retractor is provided with a force limiting device with at least two stages and with a switching device switchable by means of a pyrotechnic drive for setting a different force level for the force limiting device. A shaft ring is provided as a switching device which controls coupling elements serving to determine the force level, which can be displaced axially in the direction of the shaft axis between a holding position for the coupling elements and a release position of the pyrotechnic drive. The pyrotechnic drive for the shaft ring is in the form of an annular piston which is located in a housing bordering the shaft ring on an end thereof, which can be displaced in the axial direction and which lies against the shaft ring, which in case of activation is urged by the gas generated by a pyrotechnic charge and introduced into the housing and displaced in the axial direction.
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