Screw spindle pump

1. A screw spindle pump designed for delivering a cooling liquid for cooling a battery and/or power electronics or a drive assembly of a motor vehicle or a cleaning or supply liquid of a motor vehicle, comprising a housing in which a working spindle, which is couplable to a drive assembly, and at least one running spindle, which meshes with the latter, are accommodated, and comprising a feather key-like support element, which is fixed by the housing and against which the working spindle and the running spindle are axially supported, wherein, in the housing, there is provided at least one aperture through which it is possible to insert the feather key-like support element, which, in the assembled position, is received with one end in the aperture and with the other end in a receiving part situated diametrically opposite the aperture, wherein the feather key-like support element is secured via at least one securing element which closes the aperture externally.

2. The screw spindle pump according to claim 1 , wherein two apertures situated diametrically opposite one another are provided, wherein the feather key-like support element is received with its two ends in the apertures and is secured via the securing element closing the two apertures externally.

3. The screw spindle pump according to claim 1 , wherein the housing has an externally cylindrical portion in which the one or the two apertures are provided, on which cylindrical portion the securing element is arranged.

4. The screw spindle pump according to claim 1 , wherein the housing is of two-part form and has a first housing part, in which the working spindle and the at least one running spindle are accommodated, and a second housing part, which is arranged detachably on the first housing part and which has a connection portion for a cooling medium feed line.

5. The screw spindle pump according to claim 4 , wherein the second housing part is at the same time the securing element.

6. The screw spindle pump according to claim 4 , wherein the securing element is a collar ring, and in that there is provided a separate connection piece component which is arranged detachably on the housing.

7. The screw spindle pump according to claim 6 , wherein both housing parts or the housing and the collar ring are connected detachably to one another via at least one fixing element or a screw connection.

8. The screw spindle pump according to claim 7 , wherein the fixing element is a clamp or clip that engages into at least one of recesses or grooves in both housing parts or in the housing and the collar ring.

9. The screw spindle pump according to claim 8 , wherein, in the second housing part or in the collar ring, there are provided one or more slot-like first recesses which has/have associated therewith one or more second, groove-like recesses in the first housing part or in the housing, wherein, in the assembled position, the clamp or clip that is to be fixed on the second housing part or on the collar ring engages through the one or more, slot-like first recesses and engages into the one or more second, groove-like recesses.

10. The screw spindle according to claim 9 , wherein two first or second recesses situated diametrically opposite one another are provided.

11. The screw spindle pump according to claim 6 , wherein there is provided a support ring against which the second housing part or the collar ring bears and said second housing part or collar ring is supported radially against the first housing part or against the housing.

12. The screw spindle pump according to claim 11 , wherein the support ring has a conical abutment surface, by way of which it is supported against a conical support surface on the first housing part or on the housing.

13. The screw spindle pump according to claim 6 , comprising at least one sealing element which provides sealing between the first and the second housing parts or the collar ring and the housing.

14. The screw spindle pump according to claim 13 , wherein, in an inner circumference of the second housing part or of the collar ring, or in an outer circumference of the first housing part or of the housing, there is provided an encircling groove or collar, in which the sealing element, in the form of a sealing ring, is received.

15. The screw spindle pump according to claim 1 , wherein portions of the working spindle and of the at least one running spindle mesh with one another and have a length of at most 4 cm.

16. The screw spindle pump according to claim 15 , wherein the portions of the working spindle and of the at least one running spindle that mesh with one another have a length of at most 3 cm and at least of 1 cm.

17. The screw spindle pump according to claim 16 , wherein the portions of the working spindle and of the at least one running spindle that mesh with one another have a length of at least 2 cm.

18. The screw spindle pump according to claim 1 , wherein portions of the working spindle and of the at least one running spindle mesh with one another and have an outer diameter of at most 1 cm and at least 0.5 cm.

19. The screw spindle pump according to claim 1 , wherein, on the drive-side end of the working spindle, there is provided a connection geometry at which a coupling element coupled to the drive assembly is connected in a rotationally conjoint manner.

20. The screw spindle pump according to claim 1 , wherein the housing is composed of plastic.