Patent ID: 8608452
Filing Date: 2013-12-17
Classification: F04D,F05D

Abstract:
1. A variable coolant pump for a cooling circuit of an internal combustion engine, comprising: a pump housing having an inlet connection piece and an annular passage; a hollow shaft mounted in the pump housing; a pulley arranged to drive the hollow shaft; an inlet chamber; an impeller fastened to one end of the hollow shaft and having vanes that project into the inlet chamber; a cover disc; axial bridges that firmly connect the impeller to the cover disc, whereby through rotation of the impeller, together with the cover disc, water can be sucked into the inlet chamber via the inlet connection piece of the pump housing and conveyed by the vanes into the annular passage of the pump housing; a piston located inside the hollow shaft; a positioning unit; and a guide disc having a contour corresponding to the impeller, arranged between the impeller and the cover disc, guided by the axial bridges, and displaceable axially via the positioning unit by the piston, a pulley arranged to drive the hollow shaft; wherein the housing has a chamber located opposite the inlet connection piece, and further comprising a sheet metal element, wherein the pulley and the positioning unit are arranged in the chamber which is closeable by the sheet metal element and wherein the sheet metal element carries the positioning unit.