Variable turbines - / compressor geometry offers one popular possibility

摘要

The present invention relates to a variable turbines - / compressor geometry offers one popular possibility (1) with a vane bearing ring (2) in each case via a guide vane trunnions (4) rotatably supported guide vanes (3), which in each case two end faces (6, 7), wherein one of the end faces (6) facing the vane bearing ring (2), and the other end face (7) a cover plate (5) is facing. The invention is characterized in that at least one of the end faces (6, 7) at least in some areas along a transverse axis (9) of the end faces (6, 7) towards the vane bearing ring (2) or towards the cover disk (5) is tapered. As a result, in particular in the case of a closed state of the guide vanes (3) or of the variable turbines - / compressor geometry offers one popular possibility (1), a bypass flow past the guide vanes (3) is prevented or at least reduced. Furthermore, the invention relates to a guide blade (3) for such a variable turbines or compressor geometry offers one popular possibility (1). The present invention also relates to a charging device, in particular an exhaust gas turbocharger of an internal combustion engine, with such a variable turbines - / compressor geometry offers one popular possibility (1).