MECHANICAL COOLANT PUMP

摘要

The invention refers to a mechanical coolant pump ( 10) for an internal combustion engine, comprising an impeller pump wheel ( 14) pumping the liquid coolant incoming in axial direction radially into an outlet volute (16), a pump housing (12) including a outlet volute housing (13) defining the outlet volute (16) including a first outlet channel (18), and an outlet valve arrangement in the route of the first outlet channel (18), the outlet valve arrangement comprising a valve body (30) being movable between an open position and a closed position to leave open or close a valve opening (19) of the first outlet channel ( 18), whereby the valve body (30) is provided with a circle segment body (32) being rota table around a valve body pivot axis (31) being provided within the outlet volute ( 16), the proximal surface (33) of the circle segment body (32) is distant from the pivot axis (31) with an offset distance (O) of minimally ¼ of the maximum outside radius (R) of the circle segment body (32), the volute housing (13) is provided with a recess (24) for housing the circle segment body (32) in the closed valve position, and the lateral distance (L) of the pivot axis (31) to the volute housing wall (13) comprising the recess (24) is approximately equal to the offset distance (O).