Variable capacity vane pump

Vane pump having an annular cam which is fixedly disposed in a pump housing, a rotor which is regionally circumferentially surrounded by the annular cam and has axial slots, and vanes, which are displaceable in the axial slots and are guided by radial outer margins of the vanes on the annular cam, said vanes separating pump working chambers from one another in an annular space left radially between the annular cam and a first rotor part surrounded by the annular cam,

• wherein the rotor possesses a further rotor part of large diameter axially next to the annular cam which, further rotor part is at least equally as large as a maximum diameter of the annular cam relative to a rotor axis, the slots in the first rotor part surrounded by the annular cam continuing axially and in a radially outward direction into the further rotor part,
• wherein there is disposed an axial slide of annular cross-section on an end face of the rotor facing away from the further rotor part, an outer contour of which axial slide corresponds to an inner contour of the annular cam and an inner contour of which axial slide corresponds to the circular outer contour of the first rotor part surrounded by the annular cam,
• wherein an axial distance between the further rotor part and a facing end face of the axial slide is adjustable, the vanes being axially slidable into the slots in the further rotor part or axially out of these slots in response to adjustment of the axial slide,
• wherein the vanes in each case comprise a vane-carrier part and a vane part, the vane-carrier part being axially retained between stationary parts on the end face of the rotor such that the vane part are only radially moveable, within the slots,
• wherein the vane part is guided radially on an outside on the annular cam and bears against an adjacent end wall of the axial slide, said vane part being guided axially displaceably on the vane-carrier part.