Patent ID: 9080573
Filing Date: 2015-07-14
Classification: F04D,F05D

Abstract:
1. A coolant pump for delivering a coolant in a coolant circuit of a combustion engine, said coolant pump comprising: a) a housing; b) a drive shaft, which is rotatably mounted by the housing, for being rotationally driven by the combustion engine; c) a radial feed wheel which can be rotationally driven by the drive shaft, for delivering the coolant from a radially internal inflow region into a radially more external outflow region; d) a setting structure which can be adjusted into different positions relative to the housing by means of a control fluid, for adjusting a flow geometry, wherein a flow cross-section or flow profile on the flow path of the coolant comprises the inflow region, the radial feed wheel and the outflow region, and wherein said flow geometry influences the delivery volume of the pump at a given rotational speed; e) a control valve for setting a pressure or a volume flow of the control fluid formed by the coolant, wherein said pressure or said volume flow determines the position of the setting structure; and in addition to the radial feed wheel, a servo pump for delivering the control fluid to the control valve, wherein g) the servo pump is a rotary pump which can be rotationally driven by the drive shaft and comprises at least one servo pump wheel which can be rotationally driven.