Lobe pump

A lobe pump, comprising:

• a housing having an inlet and an outlet for a medium to be pumped,
• at least one lobe mounted in the housing so as to be drivable and rotatable and which has at least two conveying vanes wherein each of said at least two conveying vanes is provided with a contour, wherein said at least one lobe conveys the medium to be delivered from the inlet to the outlet,
• at least one sealing element per lobe mounted on a sealing body, wherein the at least one sealing element runs over a contour of the at least one lobe during rotation of the at least one lobe and performs an outward travel movement from a minimum diameter of the at least one lobe to a maximum diameter of the at least one lobe and an inward travel movement from the maximum diameter of the at least one lobe to the minimum diameter of the at least one lobe on different sides of each of the at least two conveying vanes,
• wherein a distance which the at least one sealing element covers on an inward travel side of each conveying vane during the inward travel movement is smaller than a distance on an outward travel side which the at least one sealing element covers during the outward travel movement, and wherein a contour on an outward travel side has a curvature without an inflection point and a contour on an inward travel side has at least one inflection point.