| 主权项 |
1. A seat belt pretensioner comprising:
a housing, a belt shaft (10), a load limiting device (70) connected with the belt shaft (10), a pretensioner drive wheel (20) coupled to the belt shaft (10) in a rotationally fixed manner, a coupling element (60) located on the pretensioner drive wheel (20), which is fixed in the circumferential direction via a detachable connection and can be locked in a housing-fixed manner in the belt webbing extraction direction by a blocking device (90), and an engagement wheel (50) is provided for connecting the belt shaft (10) with the pretensioner drive wheel (20) having axially directed conical engagement portions (51) engages into corresponding recesses (12) on the belt shaft (10) or on the pretensioner drive wheel (20) and is fixed in the circumferential direction on the pretensioner drive wheel (20) by the coupling element (60), the detachable connection between the coupling element (60) and the pretensioner drive wheel (20) can be disconnected by the housing-fixed locking of the coupling element (60) and a rotation of the belt shaft (10) in the belt webbing extraction direction, and, thereby, the engagement wheel (50) is enabled to undergo a relative rotational movement in relation to the pretensioner drive wheel (20) or in relation to the belt shaft (10), which relative rotational movement is superimposed with an axial movement by the conical engagement portions (51), whereby the engagement portions (51) disengage from the recesses (12) and the form-closed connection between the pretensioner drive wheel (20) and the belt shaft (10) can be released, wherein the coupling element (60) is connected with the pretensioner drive wheel (20) via a snap-off lug (22) which connects the coupling element from the pretensioner drive wheel. |
