Abstract: A tensioning and damping element for endless chain drives, especially for roller chain drives, can be used for endless chain drives, which are to be tensioned diametrically. The material is an elastic plastic. All told, the known tensioning and damping elements, in conjunction with the wear of the chain, the load changing phases, as well as the reversing according to the degree of deformation, have the disadvantage of a phased running irregularity, an increased running noise and of wear-intensive areas in the toothed rim. An element with a ring part and a toothed rim of arc-shaped teeth with, in each case, axially opposite bulges in the roller-seating and, between these, roller-seating depressions, grooves, which are disposed peripherally between the ring part and the bulges, an extended pitch and extended roller-seatings with the advantageous profile shape similar to a semielliptical curve lying on the root circle.

Abstract: A tensioning and damping element for endless chain drives, especially for roller chain drives, can be used for endless chain drives, which are to be tensioned diametrically. The material is an elastic plastic. All told, the known tensioning and damping elements, in conjunction with the wear of the chain, the load changing phases, as well as the reversing according to the degree of deformation, have the disadvantage of a phased running irregularity, an increased running noise and of wear-intensive areas in the toothed rim. An element with a ring part and a toothed rim of arc-shaped teeth with, in each case, axially opposite bulges in the roller-seating and, between these, roller-seating depressions, grooves, which are disposed peripherally between the ring part and the bulges, an extended pitch and extended roller-seatings with the advantageous profile shape similar to a semielliptical curve lying on the root circle.

Abstract: An automatic tensioning and damping element for endless chain drives includes an elastically deformable which automatic tensioning and damping element (3) exhibits a on its outer surface a guide profile matching the profile of the chain with a guide play and which automatic tensioning and damping element (3) is disposed pretensioned between the load strand (1) and the loose strand (2). The automatic tensioning and damping element (3) supports itself slidingly in the loose strand angle and is thus automatically controlling and self-adjusting in its distance relative to the chain wheels.

Abstract: A communication element for a hierarchical management network enhances the reliability of such a network. The communication element features at least 2 interfaces (2, 3) each having an assigned port (7, 8). A connection to communication elements of a higher hierarchical level of the management network can be established via each interface. A further variant of such a communication element features by at least two interfaces (4, 5) to which is assigned a shared port (11) and via each of which a connection to communication elements of a lower hierarchical level can be established. A further variant of a communication element includes features which can be formed from a combination of all the features of the two first variants. Structures of management networks are made possible with the communication elements presented, are explained.