Abstract: A shiftable toothed-belt drive, containing an engagement and disengagement device, in order alternately to mesh radially and demesh radially a toothed belt, which is guided around at least two gearwheels, with and from at least one of the two gearwheels. A disengager in the form of two externally profiled pulleys is urged axially along the shaft of one of the gearwheels supporting the toothed belt for radially raising the belt and demeshing the belt from the gearwheel. An engager engages the outside of the belt for tensioning the belt sufficiently to counter the effect of the disengager, move the pulleys apart and mesh the belt with the one gearwheel.

Abstract: A pump for supplying fluid, in particular hydraulic oil, comprises a drive shaft extending into the interior of the pump housing and the shaft is mounted on at least one bearing device lubricated by a partial flow of the fluid supplied. A sealing device seals the radial gap between the housing of the pump and the drive shaft. The sealing device comprises a sealing ring of substantially U-shape cross-section. One arm of the U forms a first sealing portion resting against the drive shaft under pre-stress. The other arm of the U forms a second sealing portion resting under pre-stress against a sealing face of the housing surrounding the drive shaft. The sealing ring has a sealing area connecting the first and second sealing portions and forming the base of the U and facing the interior of the pump so that the first and second sealing portions extend from the sealing area in a direction away from the interior of the pump.