Abstract: The invention relates to a compressor (1) for an internal combustion engine of a motor vehicle, comprising an input shaft (2) which drives the compressor (2) and via a switchable electromagnetic clutch can be coupled to a pulley (10) which can be driven by the internal combustion engine. The clutch comprises a friction surface (10′) which is positioned at the face end of the pulley (10), a disk carrier (12) mounted in a non-rotating manner on the input shaft (2) and an annular magnet or toroidal coil system (6) housed in an annular gap (11) or annular recess of the pulley (10) for pressing a disk (15) mounted in a non-rotating manner on the disk carrier (12) against the friction surface (10′). A sleeve (8) is mounted in a non-rotating manner on the input shaft (2), the pulley (10) is rotationally mounted on the sleeve (8) and the disk carrier (12) is flanged to the face end of the sleeve (8).

Abstract: A multipart, extremely low weight tire rim for high-speed vehicles wherein the interior part of the rim or wheel spider is made of titanium for strength purposes, while the exterior rim parts holding the tire and forming the tire bed consist of aluminum or another easily workable material and wherein the interior part of the rim or wheel spider may be constructed to be disk-shaped or of an arched shape that is manufactured by deformation of titanium sheet metal in the superplastic state.