Abstract: An outer plate for a chain is disclosed, the outer plate having two bores each adapted to receive an end of a pin. Each one of the bores has an inner wall with a layer of imbedded abrasive material. A chain assembled from the outer plates and the pins is also provided.

Abstract: The toothed chain employs tracks of inner plates, a track of middle plates and tracks of outer plates. At least one track of inner plates or the track of middle plates has teeth projecting in both a first direction and a second direction and a pair of pin holes. The teeth are mirrored along a centerline of each link plate. The outer plates also contain pin holes, and can have a symmetrical shape such that the lower portion and the upper portion have the same shape. The outer plates are fixed to the two tracks of inner plates and track of middle plates by pins that are fitted into the pin holes of the plates, forming an endless loop.

Abstract: Tensioning device (1) for a traction element drive, such as a belt or chain drive, with a tensioning arm (4), which can pivot relative to a body (2) about a pivot axle (3) and on whose distal end a roller (5) supported rotatably is arranged for tensioning the traction element, for the purpose of which there is a torsion spring (6) acting between the pivot axle (3) of the tensioning arm (4) and the body (2), and the pivot axle (3) is supported so that it can slide by at least one radial-bearing arrangement (7) and at least one axial-bearing arrangement (8), wherein the axial-bearing arrangement (8) comprises a friction disk (9) arranged concentric to the pivot axle (3), wherein the friction disk (9) has an axial stop surface (11), which comprises at least one radial circumferential key groove (12) and that at least one radial circumferential friction spring, which extends into the key groove (12), is constructed in the surface adjacent to the stop surface (11) of the friction disk (9).

Abstract: A friction wheel drive, especially for driving an auxiliary unit of an internal combustion engine in a frictionally engaging manner is provided. The friction wheel drive includes an adjustable friction wheel (3, 3?) which can be pressed at least against a contact disk (7, 9) of an output member (8) and/or an input member (10). In order to create a particularly simple, mechanically operating friction wheel (3, 3?), the friction wheel is provided with a running disk (5) which is mounted on a rolling bearing (19) that is fixed to the engine. The running disk (5) includes a tapered annular groove (24) having a width that can be varied by axially movable, spring-force impinged sidewalls (21). Further, a friction ring (4, 4?) having a diameter that is larger than that of the tapered annular groove (24) is inserted into the groove such that the friction ring (4, 4?) is disposed eccentric to the same, is guided in a radially movable fashion, and is spring mounted.

Abstract: Tensioning device (1) for a traction element drive, such as a belt or chain drive, with a tensioning arm (4), which can pivot relative to a body (2) about a pivot axle (3) and on whose distal end a roller (5) supported rotatably is arranged for tensioning the traction element, for the purpose of which there is a torsion spring (6) acting between the pivot axle (3) of the tensioning arm (4) and the body (2), and the pivot axle (3) is supported so that it can slide by at least one radial-bearing arrangement (7) and at least one axial-bearing arrangement (8), wherein the axial-bearing arrangement (8) comprises a friction disk (9) arranged concentric to the pivot axle (3), wherein the friction disk (9) has an axial stop surface (11), which comprises at least one radial circumferential key groove (12) and that at least one radial circumferential friction spring, which extends into the key groove (12), is constructed in the surface adjacent to the stop surface (11) of the friction disk (9).

Abstract: Tensioning device (1) for a traction mechanism drive, such as a belt or a chain drive, with a tensioning arm (4), which can pivot about a pivot axle (3) relative to a body (2) and on whose distal end there is a roller (5) supported so that it can rotate for tensioning the traction mechanism, for the purpose of which there is a torsion spring (6) acting between the pivot axle (3) of the tensioning arm (4) and the body (2). The pivot axle (3) is supported in a sliding manner by at least one radial bearing arrangement (7) and at least one axial bearing arrangement (8) separated from this radial bearing arrangement, and the axial bearing (8) is constructed as a cone friction bearing and includes a cone bearing disk (9), which is locked in rotation with the pivot axle (3) and is guided subjected to friction on the end against a cone bearing surface (10) formed in the hub section of the tensioning arm (4).

Abstract: A friction drive is provided, in particular for frictionally engaged driving of an auxiliary unit of an internal combustion engine, with an adjustable friction wheel (3), which can be brought into pressure contact with at least one contact disk (4, 6) of a drive element (5) and/or a driven element (7). A need-dependent drive of the auxiliary unit is achieved by a switchable coupling, which is used for need-dependent separation of the drive element (5) and auxiliary unit.