Abstract: Known oscillating motors have inter alia starting difficulties resulting from the fact that the sliding seal ring is subject to pressures applied within said ring, even at a standstill. According to the invention, an oscillating motor is provided, comprising a sliding seal ring capable of axially sliding on a journal (8) of the output shaft (7) and which rests on an internal surface of the cover (4) with a sliding and sealing surface. Annular rings which are located on the cover side of the sliding seal ring (23) are connected through pressure compensation bores (34) and pressure compensation channels (38) to the side of the sliding seal ring (23) oriented towards the pressure chamber (13) or the discharge chamber (14). Static pressure in the housing (27) of the diagonal seal ring (28) and dynamic pressure in the pressure chambers (13) can thus be compensated.

Abstract: Known oscillating motors tend to present scaling problems; in particular they are often inadequately sealed in relation to the outside. The scaling elements also have a short service life as a result of the considerable strains to which they are subjected. The invention therefore provides an oscillating motor whose annular sealing ring consists of a sliding sealing ring (23) and a soft sealing ring, said rings being positioned next to each other on a common axis. The soft sealing ring is configured as a diagonal sealing ring (28) and is located on the sides of the pressure or discharge chambers (13, 14). The sliding sealing ring (23) is configured so that it is torsionally rigid in relation to the rotor (2). For this purpose, it preferably has two axial grooves (32), said grooves being arranged so that they are parallel and in pairs. The grooves (32) correspond to driver elements (31) located on the rotor wings (10).

Abstract: Radial oscillating motors are generally fitted with an outer overflow oil line in order to protect sealing elements. This requires an over large amount of devices and system expenditure. Large amounts of installation space are also required for oscillating motors of this kind. The invention provides a radial oscillating motor wherein each bearing (29) is hydraulically connected to a discharge chamber (14) via a main duct (30) in addition to radial ducts (31, 15, 16, 35, 37, 38) and axial ducts (32, 36) in a driven shaft (7). A non-return valve opening out in the direction of the discharge chamber (14) is inserted into the ducts (31, 32, 37, 38).