Abstract: A device for compensating for the tooth backlash between two toothed gears in engagement with one another, with a toothed disk, which is connected in parallel with one of the toothed gears and provided with the same gear pitch, and which is held such that it can be hydraulically adjusted relative thereto until it bears against the non-force-transmitting tooth flanks of the mating toothed gear. In order to achieve a design that is as simple as possible and requires little mounting space, there must be provided at least one hydraulic adjusting element, which exerts an adjusting force in circumferential direction on the toothed gear and which is equipped with a steel piston held adjustably in a housing and urged by a spring as well as by pressurized fluid supplied via a check valve.

Abstract: In order to achieve less deformation under gas pressure load and also under thermal load, the bottom piece of a piston with ring-carrying barrel is configured as a supporting cone tapering towards the piston pin and connected with the piston pin bosses by means of supporting elements. Cone, bosses and supporting elements are made in one piece. The supporting elements comprise walls extending essentially parallel to the axis of the piston pin. First distance (A) to the outer perimeter of the piston in the direction of the piston pin axis (Y--Y) are greater than the corresponding second distances (B) normal to this axis. The end parts of the walls are curved inwardly and leave open an area around an axis (X--X) normal to the piston pin axis.