Abstract: A cutting ring assembly for a tunnel boring machine includes a fixed axle, an inner ring rotationally fixed to the axle and having an inner raceway on a radially outer surface, a cutting ring having a radially inner surface forming an outer raceway, and a plurality of rolling elements between the inner raceway and the outer raceway supporting the cutting ring on the inner ring for rotation relative to the axle.

Abstract: Disclosed is an apparatus for heating plastic preforms, having a transport device which transports the plastic preforms along a predetermined transport path, the transport device having a circulating transport and a plurality of holding devices for holding the plastic preforms, having a plurality of heating devices which are arranged stationarily along the transport path, in such a way that the plastic preforms transported along the transport path are heated by these heating devices, the heating devices each having a plurality of heating lamps, and the apparatus having a detection device which is configured to detect a failure of the heating lamps, wherein the apparatus has a control device which is configured to control the apparatus in dependence on a number of heating lamps detected having failed.

Abstract: A cutting-ring assembly configured for use in a tunnel boring machine includes a cutting ring, an axle, and a bearing unit. The cutting ring is rotatably supported on the axle via the bearing unit, and the bearing unit includes at least one rotating outer ring having a first raceway and a second raceway, at least one fixed inner ring having a first raceway and a second raceway, and rolling elements between the raceways. Either the at least one inner ring or the at least one outer ring includes a first ring having an elongated axially extending shoulder and a second ring having an elongated axially extending shoulder abutting against the elongated axially extending shoulder of the first ring.

Abstract: A bearing system for supporting components that are movable relative to one another includes at least one bearing and a preload mechanism for changing a preload of the at least one bearing based on an operating state of the bearing system, where the preload mechanism includes, for example, a piezoelectric element, a Peltier element, an expansion material or a micromechanical element.