Pump comprising a spring

A pump, comprising:

• an accommodating housing which forms a cup-shaped accommodating space comprising an end-facing wall and a circumferential wall;
• and
• a pump insert which is arranged in the accommodating space, wherein the pump insert comprises:
• a rotor;
• a first housing part and a second housing part, between which the rotor is arranged such that it rotates about a rotational axis and relative to the first and second housing part;
• a stroke ring which surrounds the rotor and is arranged between the first housing part and the second housing part;
• and
• at least one positioning element which positions the second housing part with respect to its angular position about the rotational axis relative to the first housing part,
• wherein a spring which is fastened to the at least one positioning element and which flexes along or in the direction of the rotational axis is arranged between the accommodating housing and the second housing part, wherein the spring comprises a spring structure which is made of metal and which imbues the spring with its essential spring characteristics along or in the direction of the rotational axis , and wherein the spring is supported on the end-facing wall of the accommodating housing and towards the second housing part, in a region which is arranged in axial alignment with the stroke ring in the direction of the rotational axis, and thus presses the second housing part against the stroke ring.