Abstract: A burner for an exhaust gas system of an internal combustion engine includes a combustion chamber formed by a chamber element where a mixture of air as a first fluid and fuel as a second fluid is ignitable such that a component of the exhaust gas system and/or exhaust gas of the internal combustion engine that is flowable through the exhaust gas system is heatable. A channel through which at least one of the fluids is flowable opens into the combustion chamber and via the channel the at least one of the fluids is introducible into the combustion chamber. A closure element is moveable relative to the chamber element between a closed position fluidically separating the channel from the combustion chamber and a release position fluidically connecting the channel to the combustion chamber. The chamber element has a recess in which the closure element is received in the release position.

Abstract: 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.

Abstract: The invention relates to a belt retractor (10) for a seat belt, with 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). According to the invention, it is provided that the switchable fixing device (50) has 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).