Abstract: A tool spindle for a drilling tool may include a drive shaft for driving the drilling tool, a chuck connected rigidly to the drive shaft along a rotation axis directed longitudinally with respect to the drive shaft for receiving a clamping shank of the drilling tool, and at least one radial bearing radially enclosing at least a portion of the drive shaft for radially mounting the drive shaft, configured such that the radial bearing may mount the drive shaft to be rotatable about the rotation axis. The radial bearing may be an active magnetic bearing and may be configured such that it mounts the drive shaft to be pivotable about at least one pivot axis extending perpendicularly to the rotation axis through a fixed point, wherein the fixed point may be located in a centering countersink of the drilling tool when the drilling tool is clamped in the tool spindle.

Abstract: A tool spindle for a drilling tool may include a drive shaft for driving the drilling tool, a chuck connected rigidly to the drive shaft along a rotation axis directed longitudinally with respect to the drive shaft for receiving a clamping shank of the drilling tool, and at least one radial bearing radially enclosing at least a portion of the drive shaft for radially mounting the drive shaft, configured such that the radial bearing may mount the drive shaft to be rotatable about the rotation axis. The radial bearing may be an active magnetic bearing and may be configured such that it mounts the drive shaft to be pivotable about at least one pivot axis extending perpendicularly to the rotation axis through a fixed point, wherein the fixed point may be located in a centering countersink of the drilling tool when the drilling tool is clamped in the tool spindle.

Abstract: Pin bosses of a piston for an internal combustion engine each have a pin bore for supporting a piston pin. In order to reduce the tangential stresses in the zenith area of the pin bores, and thus to extend the service life of the piston, the inner areas of the pin bores as viewed in the direction of the bore axis have areas on both sides of the zenith that have a greater distance from the bore axis than the zenith of the pin bore, and the outer areas of the pin bores, as viewed in the direction of the bore axis, are transversely oval relative to the piston axis.

Abstract: The invention relates to pin bosses (1) of a piston (2) for an internal combustion engine, each comprising a pin bore (3) for supporting a piston pin (14). In order to reduce the tangential stresses in the zenith area of the pin bores and thus to extend the service life of the piston, the inner areas (16) of the pin bores (3) as viewed in the direction of the bore axis (13) have areas on both sides of the zenith (4) that have a greater distance from the bore axis (13) than the zenith (4) of the pin bore (3), and the outer areas (17) of the pin bores (3) as viewed in the direction of the bore axis (13) are transversely oval relative to the piston axis (7).

Abstract: An assembled two-part piston, comprising: a piston upper part and a piston lower part, wherein a screw thread connects the piston upper part to the piston lower part.

Abstract: A device for machining and assembling a piston, comprising, a piston upper part; and a piston lower part; an upper work spindle and a lower work spindle, wherein the upper and lower work spindles are arranged coaxially to one another and are at least one of -actuated independently of one another and actuated together, such that one work spindle supports the piston upper part and the other work spindle supports the piston lower part; and a first and second tool carriage, wherein the tool carriages are actuated independently of one another, such that one tool carriage supports a tool for machining the piston upper part and the other tool carriage supports a tool for machining the piston lower part, wherein the device is configured such that both of the piston upper and lower parts are machined independently of one another, aligned with regard to one another, and joined to one another such that the piston parts remain clamped to the tool carriages in the interim.

Abstract: The invention relates to a piston (1), which is comprised of an approximately circular cylindrical upper area (5) and of a lower area (6), having two hubs (7), which are set back toward the piston central axis (8) so that, in the upper area (5), recesses (12, 12?) can be made, which are open toward the lower area (6), in the vicinity of the hubs (7). In order to make relief cuts (13, 13?) in the area between the hubs (7) and the upper area (5), a salt mold part (15) is placed on the respective window insert (14). The salt mold part (15) serves to produce the recesses (12, 12?) as well as the relief cuts (13, 13?) when casting the piston (1) and is washed out after the piston (1) has been cast.

Abstract: The invention relates to a piston (1), which is comprised of an approximately circular cylindrical upper area (5) and of a lower area (6), having two hubs (7), which are set back toward the piston central axis (8) so that, in the upper area (5), recesses (12, 12?) can be made, which are open toward the lower area (6), in the vicinity of the hubs (7). In order to make relief cuts (13, 13?) in the area between the hubs (7) and the upper area (5), a salt mold part (15) is placed on the respective window insert (14). The salt mold part (15) serves to produce the recesses (12, 12?) as well as the relief cuts (13, 13?) when casting the piston (1) and is washed out after the piston (1) has been cast.