A device includes at least one volume that comprises a liquid quantity of a liquid and a partial volume with a working medium. The device further includes multiple volume limiting elements which limit the at least one volume and which are configured such that one or more passages allow outflow of a maximum of a predetermined partial quantity of the liquid quantity during one or more of a compression period, an expansion period, or a displacement period. The liquid quantity performs a rotation about an axis of rotation. The multiple volume limiting elements are configured to prevent an annular flow of the liquid quantity about the axis of rotation. The at least one volume is changeable in terms of its overall size by displacement of at least one of the volume limiting elements.

A vane pump device includes: a rotor supporting 10 vanes movable in a rotation direction; and a cam ring having an inner circumferential surface facing an outer surface of the rotor. A fluid-suction step where transits to a fluid-discharge step by changing the pump chamber capacity in response to the rotation angle, as a result of the change in the distance from the rotation center to the inner circumferential surface of the cam ring in response to the rotation angle. A starting angle, at which the distance starts increasing after a same distance segment has reached a predetermined rotation angle, has a rotation angle difference of 2.5 degrees or less with respect to a center angle that equally divides a rotation angle at which a downstream-side end portion in the discharge port is formed and a rotation angle at which an upstream-side end portion in the suction port is formed.

A pump device includes: a drive shaft; a pump element; a pump housing including; a pump element receiving space, first and second bearing receiving spaces, a suction passage, a discharge passage, a return passage, and a seal receiving space, a first bearing including a first lubrication groove, received within the first bearing receiving space, and supporting the drive shaft; a second bearing which includes a second lubrication groove having a sectional area that is perpendicular to the rotation axis, and that is greater than a sectional area of the first bearing that is perpendicular to the rotation axis, which is received within the second bearing receiving space, and which supports the drive shaft; and a seal member provided within the seal receiving space, and arranged to seal between the drive shaft and the pump housing.

The invention relates to a rotary sliding vane machine (1) for fluid processing, comprising a housing (2) with a cavity (4) with a rotor (9). Vanes (12) are arranged in outwardly directed slots (13) in the rotor (9), and relative sliding between the vanes and the rotor provides spaces with variable volumes in the rotational direction. Each vane is supported by a vane bearing apparatus (102) comprising a slide bearing body (105) with a slot (13) forming a slide bearing for the vane (12), and a cylindrical convex face (116) facing away from the slot (13), and, on each side of the slot (13), a pivot bearing pad (106) with a cylindrical concave face (117) facing the slide bearing convex face (116), forming a pivot bearing for the vane.

A vane pump includes a housing, a rotor rotatable about a rotation axis, and a vane that rotates together with the rotor and reciprocates in a radial direction with respect to the rotor, the vane dividing a pump chamber into a plurality of working chambers. At least one of opposite end surfaces of the vane in an axial direction is a sliding surface that slidably contacts an inner surface of the housing via an oil film, and an oil reservoir portion is provided in the sliding surface in a recessed manner.

The invention relates to a pump, having a contour ring, having a rotor, having vanes, having side plates, having a housing and a housing cover, having under-vane grooves for supplying the lower vane faces with pressure, the vanes being arranged radially displaceably in the rotor and extending under the vanes as a result of the pressure and being pressed against the contour ring. Furthermore, the invention relates to a system for supplying oil to a consumer.

A rotary vane pump having a stator and having a rotor in which at least one rotary vane is received. A radially outer side of the rotary vane serves for delimiting a low-pressure chamber. A radially inner side of the rotary vane serves for delimiting a high-pressure chamber.

A cartridge vane pump includes a rotor, a plurality of vanes, a cam ring, a side member brought into contact with a first end surface of the cam ring, a cover member brought into contact with a second end surface of the cam ring, the cover member being attached to the body, and a linkage member provided to extend between the side member and the cover member over an outer circumferential surface of the cam ring, the linkage member being configured to link the side member and the cover member.

A vane cell pump, including: a rotor, which can be rotated about a rotational axis, and a plurality of vanes which are guided by the rotor such that they can be shifted, wherein the rotor includes a sub-vane chamber for each vane, and each vane forms a shifting wall of the sub-vane chamber assigned to it; a first end-facing wall which adjoins the rotor on an end-facing side on a first side of the rotor and which, in order to control pressure to the sub-vane chamber, includes a sub-vane cavity which extends in the circumferential direction and includes a control edge as viewed in the circumferential direction; a second end-facing wall which adjoins the rotor on an end-facing side on a second side of the rotor and which, in order to control pressure to the sub-vane chamber, includes a sub-vane cavity which extends in the circumferential direction and lies opposite the sub-vane cavity of the first end-facing wall and includes a control edge, as viewed in the circumferential direction, which is similar to the control edge of the sub-vane cavity) of the first end-facing wall, wherein the control edge of the sub-vane cavity of the first end-facing wall, and the control edge of the sub-vane cavity of the second end-facing wall which is similar to it, are formed differently from each other and/or are arranged offset, in particular angularly offset about the rotational axis as the apex, with respect to each other.

Variable displacement-type oil pump has pump configuration unit driven by engine and discharging oil sucked from inlet portion from outlet portion by volumes of a plurality of pump chambers being varied; cam ring changing volume variation of each pump chamber by moving; coil spring forcing cam ring in direction in which volume variation of each pump chamber is increased; control oil chamber forcing cam ring in direction in which volume variation of each pump chamber is decreased; drain port draining oil from control oil chamber; control valve into which a downstream side oil discharged from outlet portion is introduced, and which adjusts internal pressure of control oil chamber by supplying oil into control oil chamber when hydraulic pressure of the introduced oil exceeds a predetermined setting working pressure. With this configuration, it is possible to suppress increase in electric power consumption associated with an electrical control mechanism.