| 摘要 |
The invention relates to a belt retractor for a seat belt having a belt reel for winding up and unwinding the seat belt and a torsion bar which is arranged outside the belt reel and is connected at one bar end to a switchable fixing device. The switchable fixing device keeps the bar end rotationally fixed in one state and permits rotation of the bar end in another state. The switchable fixing device has a displaceable piston which, with a piston portion, in a locking position, can secure the bar end against rotation and, in a release position displaced in relation to the locking position, releases the bar end. |
| 主权项 |
1. A belt retractor (10) for a seat belt comprising:
a belt reel (20) for winding up and unwinding the seat belt, and a torsion bar (30) which is arranged outside the belt reel (20) and is connected at one bar end (32) to a switchable fixing device (50), the switchable fixing device (50), in one state, keeping the bar end (32) rotationally fixed and, in another state, permitting rotation of the bar end (32), wherein the switchable fixing device (50) has a housing (60) and a displaceable piston (80) which, with a piston portion, in a locking position, can secure the bar end (32) against rotation and, in a release position displaced in relation to the locking position, releases the bar end (32), in an outer piston portion located outside the housing (60) the piston (80) has a slot-like depression or a slot-like hole (82) in which—in the locking position of the piston (80)—a locking pin (91) engages, the locking pin blocking or at least limiting an axial displacement of the piston (80) in the direction of the release position, and the locking pin (91) is of a size that when the gas generator (70) is activated, the locking pin is sheared off by the piston (80). |
