Patent ID: 8235653

Claim:
A variable coolant pump for a cooling circuit of an internal combustion engine, the variable coolant pump comprising: a pump head having an inlet, an annular channel and an outlet; a pump housing rotatably supporting a pump shaft having an axial end; a pump blade wheel mounted on the axial end of the pump shaft and disposed in the pump head; and a plurality of adjustable guide blades arranged concentrically about the pump blade wheel between the annular channel and the pump blade wheel, wherein: each adjustable guide blade having two longitudinal sides and an outer edge, the outer edge being disposed at an end of the two longitudinal sides, and including a first pivot, a second pivot and a third pivot, wherein the first and second pivots extend at right angles to a respective one of the two longitudinal sides in a vicinity of the outer edge, the first and second pivots define an axis of rotation and rotatably support the respective guide blade in the pump head about the axis of rotation, wherein the third pivot is disposed in parallel with the first and second pivots in an area in the adjustable guide blade remote from the axis of rotation and protrudes into an oblong recess in an adjustment ring rotatably arranged in the pump head, and wherein the oblong recess has a radial and a tangential component.