| 摘要 |
A belt brake is described for a safety belt for protecting occupants in a vehicle, which belt can be wound onto and unwound from a belt drum mounted rotationally about a belt shaft. A method for locking a safety belt is also described. The invention comprises at least one braking means is mounted to enable displacement thereof along the belt shaft, is connected in a rotationally fixed manner to the belt shaft, and is located between a first and a second thrust bearing. A means is provided which is actively connected to at least the first thrust bearing and according to the winding up or unwinding of the safety belt onto or from the belt drum, the first thrust bearing is forcibly guided along the belt shaft, thereby enabling the first thrust bearing to be transferred from a first position, in which the safety belt is wound on the belt drum and in which an axial distance a, exists between the braking means and at least one thrust bearing, and to a second position, in which the safety belt is at least partially unwound from the belt drum and in which an axial distance a<SUB>2 </SUB>exists between the braking means and at least one thrust bearing where a<SUB>2</SUB><1<SUB>1</SUB>. At least one actuator element is actuated in the second position to generate a braking force which acts along the belt shaft between the first and second thrust bearings and which is orientated towards the at least one braking means.
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