Abstract: The invention concerns a variable pump or hydraulic motor with a drive axis with a first axis of rotation and first plungers connected to the drive axis and rotatable around the first axis of rotation. A port plate mounted in the housing can rotate around an axis intersecting the first axis, for adjusting the stroke volume. The port plate positioning drive comprises two counter-acting hydraulic actuators acting on the port plate in the direction of the first plungers.

Abstract: The invention relates to a hydraulic device having, in a housing, a rotor, which can rotate about a first axis, with pistons and chambers on both sides of the rotor, which can rotate about a second axis and are formed by a cylindrical wall and a piston. The cylindrical walls are rotatable about a second axis (m1 and m2) and the first axis, such that, during rotation of the rotor, the volumes of the rotor chambers on one side of the rotor and the rotor chambers on the other side of the rotor alternatively have a minimum value.

Abstract: The invention relates to a hydraulic device having, in a housing, a rotor, which can rotate about a first axis, with pistons, drum sleeves, which can rotate about a second axis and have a chamber formed by a cylindrical wall and a piston. Between the housing and the drum sleeves there is a face plate. The chamber is connected to a line connection via a first passage, of which a face-plate port forms part. Between the face plate and the drum sleeve there is a drum plate which can rotate with the drum sleeves and has drum ports which form part of the first passage.

Abstract: The invention relates to a hydraulic device having, in a housing, a rotor, which can rotate about a first axis, with pistons, chambers, which can rotate about a second axis and are formed by a cylindrical wall and a piston. The chamber is connected to a line connection via a first passage, of which a face-plate port forms part. On the side remote from the first face plate, the rotor is provided with rotor ports and with a second passage through each piston for connecting each chamber to a rotor port, it being possible for the rotor ports to rotate along the housing or along a second face plate, which is positioned in the housing, in such a manner as to form a seal. As a result, the rotor can be balanced in the axial direction, so that the axial load is independent of the pressure in the chambers.

Abstract: The invention concerns a hydraulic device with a housing and a rotor which can rotate in the housing and has fixedly mounted pistons. Around the piston there are drum sleeves which each, together with a piston, form a chamber of variable volume and which are supported by a drum plate with an axis which intersects the axis of the rotor at an angle. Clamping means hold the drum sleeve against the drum plate and the clamping means are designed in such a manner that the drum sleeves can make a movement along the drum plate which is double of the radial movement which occurs in the event of synchronous rotation between the drum plate and a drum sleeve.