Electric pump supported by journal bearings

A pump unit having a drive shaft (2) and a rotatably arranged rotor (3) which is driven by the drive shaft (2), the drive shaft (2) having, on an end side, an oblique sliding face (4) which causes the rotor (3) with a rotor axis (5) to tumble during rotation of the drive shaft about a drive axis (6) of the drive shaft (2), the drive shaft (2) having a first bearing section (18) and a second bearing section (19) which is farther from the rotor (3) than the first bearing section (18), the first bearing section (18) being arranged in a first plain bearing (20), and the second bearing section (19) being arranged in a second plain bearing (21), characterized in that the diameter of the first bearing section (18) and the diameter of the first plain bearing (20) are respectively greater than the diameter of the second bearing section (19) and the diameter of the second plain bearing (21), wherein an armature section (22) is provided on the drive shaft (2) between the first bearing section (18) and the second bearing section (19), wherein the armature section (22) has, mounted on a circumference of the armature section, permanent magnets (23) that interact with an electric winding (26) of an electric stator (27) which surrounds the armature section (22), wherein the first plain bearing (20) and the second plain bearing (21) are arranged on a circumferential wall (29) of a housing (1) of the pump unit, wherein the stator (27) is arranged in the circumferential wall (29) of the housing (1) between the first plain bearing (20) and the second plain bearing (21) as viewed in the axial direction, and wherein the diameter of the first bearing section is greater than a diameter of any other section of the drive shaft.