The invention relates to an electric motor-driven motor-vehicle vacuum pump (1), having a drive shaft (3) which has, in particular, two bearings and extends with a shaft stub (5; 35; 45) into a rotor (8) which is connected fixedly to the shaft stub so as to rotate with it. In the rotor, the shaft stub has a centring region (26; 36; 46) which serves to center the rotor, without guiding the rotor in the axial direction.

It is intended to provide a vacuum pump so that without upsizing the vacuum pump, noise and vibration are reduced, heat dissipation property is secured, and the casing is downsized. Therefore, at least one turning part is provided in an exhausting path formed in a casing body. The casing body is formed of a material whose thermal conductivity is higher than that of a rotor and vanes, and a cylinder part where the vanes slide is press fitted in the casing body.

A rotor for a vane cell pumpin particular, for a vacuum pumpwith a base body that is made of plastic and can be driven by rotation, and that rotates about an axis of rotation during operation, wherein the base body comprises a guiding section for slidably receiving a pump vane and wherein the base body is flanked in the direction of the axis of rotation by a first bearing surface and a second bearing surface, wherein the second bearing surface comprises bearing sections that are at a distance from one another and that lie on a circular path that is arranged concentrically to the axis of rotation.

A vane cell machine includes a housing, rotor, curved ring, spring, and pressure piece. The rotor is configured to rotate about a rotation axis and includes a plurality of plate-like wings that are radially displaceable. The curved ring surrounds the rotor and delimits a movement path of the wings. Each pair of adjacent plate-like wings delimits a corresponding operating chamber. The housing surrounds and enables displacement of the curved ring. The spring is positioned between the curved ring and the housing, is pretensioned, and is configured to load the curved ring. The pressure piece is positioned between the spring and the curved ring, and sealingly abuts the housing and the curved ring so as to delimit a first and second pressure chamber from each other. The housing and the curved ring further delimit the first and second pressure chambers.

A vane compressor includes a housing having therein a suction chamber, a discharge chamber having a cover, and a rotor chamber, a rotor having therein a plurality of vane slots, and a plurality of vanes. The housing includes a partition that has a first surface forming the other surface of the rotor chamber and a second surface and separates the rotor chamber from the discharge chamber. An intermediate pressure chamber having a pressure that is lower than the discharge chamber and higher than the suction chamber is formed between the partition and the cover. A part of the second surface and a part of a covering surface of the discharge chamber cover are spaced away from each other by the intermediate pressure chamber. The intermediate pressure chamber is disposed so as to overlap at least a part of the other surface of the rotor chamber.

The invention specifies a hydraulic vane-type machine (1) having a stator (2) and having a rotor (3) which has multiple vanes (4), each of which vanes is radially displaceable in a guide (5) in the rotor (3), bears against an inner circumference (6) of the stator (2), and, together with the rotor (3), the stator (2) and in each case one side wall (7) at each axial end of the rotor (3), delimits working chambers whose volumes vary in the event of a rotation of the rotor (3) relative to the stator (2). It is sought to obtain a certain degree of freedom for the design of the inner circumference. For this purpose, it is provided that each vane (4) has, on its radially inner side, an abutment surface (17) which bears radially at the outside against a cam disk (15).

Prime movers are provided that can include: a pair of cylindrical members about a center rod, a fixed member about the center rod between the pair of cylindrical members; wherein the pair of cylindrical members rotate with the center rod in relation to the fixed member; a housing extending between the cylindrical members; and a plurality of chambers between the opposing bases of the cylindrical members and the fixed member. Methods for rotating members in relation to a fixed member are also provided. The methods can include rotating a pair of cylindrical members in relation to a fixed member about a center rod along a shared axis within a housing extending between the pair of cylindrical members.

Electricity generators are provided that can include: members having opposing bases that include chambers to facilitate the conversion of source energy to mechanical energy with one of the members rotating in relation to another of the members and a housing about the rotating member. Generator components can be operably engaged to the housing and rotating member to generate electricity. Methods for generating electricity are also provided. The methods can include: rotating a first cylindrical member in relation to a fixed second member about a center rod along a shared axis within a housing; and generating electricity between conductive components along both the sidewalls of the first cylindrical member and the housing.

A vacuum pump having a housing composed of light metal, in which a rotor composed of light metal is rotatably mounted. The rotor driving at least one vane, wherein the rotor is composed of light metal and has at least three different diameters along the axis of rotation thereof.

A rotary compressor includes: a case; a cylinder inside the case and has an internal space, and which includes a rolling piston configured to eccentrically rotate in the internal space, a vane in contact with the rolling piston such that while the vane is in contact with the rolling piston, the internal space of the cylinder is divided into a suction chamber and a compression chamber, a suction port to allow refrigerant to flow to the suction chamber, and a discharge port to allow the refrigerant to be discharged the compression chamber; a drive device that includes a rotation shaft connected to the rolling piston and a motor configured to rotate the rotation shaft; and a valve member that is fixed to a side surface of the vane and selectively opens and closes the discharge port as the vane reciprocates back and forth.