Electronic dosing drive

1. An electronic dosing drive comprising:

a threaded spindle ( 28 ) with an external thread ( 31 ) for driving a plunger ( 56 ) in a cylinder ( 55 ),

at least one first guide element ( 50 . 1 , 50 . 2 ) firmly connected to the threaded spindle ( 28 ) that is guided parallel to the threaded spindle ( 28 ) on a second guide element ( 51 . 1 , 51 . 2 ),

a spindle nut ( 29 ) with an internal thread ( 35 ) that is in engagement with the external thread ( 31 ) of the threaded spindle ( 28 ),

an electric drive motor ( 42 ) that has a motor shaft ( 43 ) coupled with the spindle nut ( 29 ),

an electric control apparatus ( 52 ) connected to the electric drive motor ( 42 ),

an electrical power supply ( 11 ) connected to the electric drive motor ( 42 ) and the electric control apparatus ( 52 ),

characterized in that

the external thread ( 31 ) of the threaded spindle ( 28 ) has multiple threaded areas ( 31 . 1 , 31 . 2 ) that are separated from each other by first flattenings ( 30 . 1 , 30 . 2 ) on their circumference extending in the longitudinal direction, and

the first flattenings ( 30 . 1 , 30 . 2 ) have guide areas ( 34 . 1 , 34 . 2 , 34 . 3 , 34 . 4 ) that abut the core diameter of the internal thread ( 35 ) of the spindle nut ( 29 ).

2. The dosing drive according to claim 1 , in which the threaded spindle ( 28 ) is an injection molded part.

3. The dosing drive according to claim 2 , in which the spindle nut ( 29 ) is produced from a second plastic and/or from a metal.

4. The dosing drive according to claim 3 , in which the first plastic is a high-performance plastic or an engineering plastic and/or in which the second plastic is a high-performance plastic or an engineering plastic.

5. The dosing drive according to claim 1 , in which the threaded spindle ( 28 ) is made of a first plastic, wherein the threaded spindle ( 28 ) is injection molded from the first plastic, or in which the threaded spindle ( 28 ) is made of a metal, wherein the threaded spindle is produced by means of MIM.

6. The dosing drive according to claim 1 , in which the first flattenings ( 30 . 1 , 30 . 2 ) and support guide ribs ( 32 . 1 , 32 . 2 ) have the guide areas ( 34 . 1 , 34 . 2 , 34 . 3 , 34 . 4 ) on the outer ends.

7. The dosing drive according to claim 6 , in which the support guide ribs ( 32 . 1 , 32 . 2 ) have a second flattening ( 33 . 1 , 33 . 2 ) on each end and, bordering the two side edges of the second flattening ( 33 . 1 , 33 . 2 ), guide areas ( 34 . 1 , 34 . 2 , 34 . 3 , 34 . 4 ) at a distance from the central axis of the threaded spindle ( 28 ) corresponding to half of the core diameter of the spindle nut ( 29 ).

8. The dosing drive according to claim 7 , in which the first flattenings ( 30 . 1 , 30 . 2 ) are planar surfaces and/or in which the second flattenings ( 33 . 1 , 33 . 2 ) are planar surfaces.

9. The dosing drive according to claim 6 , in which the outer edges of the support guide ribs ( 32 . 1 , 32 . 2 ) and/or the transitions from the support guide ribs ( 32 . 1 , 32 . 2 ) to the first flattenings ( 30 . 1 , 30 . 2 ) are rounded.

10. The dosing drive according to claim 1 , in which the threaded spindle ( 28 ) has only two first flattenings ( 30 . 1 , 30 . 2 ) that are diametrically opposite each other, wherein said first flattenings have only two support guide ribs ( 32 . 1 , 32 . 2 ) that are diametrically opposite each other.

11. The dosing drive according to claim 1 , in which the threaded areas ( 31 . 1 , 31 . 2 ) of the external thread ( 31 ) taper between the first flattenings ( 30 . 1 , 30 . 2 ) in the radial direction to the outside.

12. The dosing drive according to claim 1 , in which the external thread 31 has thread profiles ( 36 . 1 , 36 . 2 ) having outer edges delimited by the first flattenings ( 30 . 1 , 30 . 2 ) are rounded off.

13. The dosing drive according to claim 12 , the thread profiles ( 36 . 1 , 36 . 2 ) having transitions of the flanks ( 37 . 1 , 37 . 2 ) to the core of the threaded spindle ( 28 ) and/or the edges of the thread profiles ( 36 . 1 , 36 . 2 ) arranged outside in the radial direction are rounded off.

14. The dosing drive according to claim 1 , wherein the dosing drive is an electronic dosing device comprising an electronic dosing drive ( 26 ), a first receiver ( 18 ) for a syringe flange of a syringe cylinder of a syringe firmly arranged on the support structure, a receiving body ( 19 ) with a second receiver ( 20 ) for a plunger rod end of a syringe plunger of the syringe, wherein the receiving body ( 19 ) is firmly connected to a lower end of the threaded spindle ( 28 ).

15. The dosing drive according to claim 14 , which is a manual dosing device ( 1 ) or is part of an automated dosing system or of an automated laboratory system.

16. The dosing drive according to claim 1 , wherein the dosing drive is an electronic dosing device comprising at least one cylinder ( 55 ) in which the plunger ( 56 ) is arranged movably which is coupled with a lower end of the threaded spindle ( 28 ), at least one seal seat ( 69 ) for firmly clamping and sealing a pipette tip ( 61 ), and at least one connecting channel ( 70 ) that connects a hole ( 72 ) in the seal seat ( 69 ) to the cylinder ( 55 ).

17. The dosing drive according to claim 16 , which is a single-channel dosing device or a multi-channel dosing device.