Coolant pump having an optimized bearing assembly and improved heat balance

An electrical coolant pump for conveying coolant in a vehicle comprising:

• a pump housing with a pump chamber in which a pump impeller is rotably accommodated, an inlet and an outlet which are connected to the pump chamber;
• a shaft which is rotably supported at a separating element between the pump chamber and a motor chamber separated from the pump chamber, and on which the pump impeller is fixed;
• a dry-running electric motor with a radially inner stator and a radially outer rotor which is accommodated in the motor chamber;
• wherein
• a radial bearing of the shaft, which is arranged in an axial direction between the pump impeller and the rotor, is provided by means of a radial sintered sliding bearing having a defined porosity lubricated by coolant;
• and
• a shaft seal is arranged between the radial sliding bearing and the motor chamber;
• wherein at least one coolant flow channel with a predetermined depth is provided in the sintered sliding bearing in an axial direction extending from the end of the sintered sliding bearing on the side of the pump chamber.