Spindle drive

Patent metadata

Field	Value
Publication number	US-11280389-B2
Application number	US-201816610983-A
Country	US
Kind code	B2
Filing date	May 2, 2018
Priority date	May 5, 2017
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

A spindle drive comprising a threaded spindle with an external thread, a spindle nut with an internal thread that is in engagement with the external thread of the threaded spindle, characterized in that the external thread of the threaded spindle has multiple threaded areas that are separated from each other by first flattenings on their circumference extending in the longitudinal direction, and the first flattenings have guide areas that abut the core diameter of the internal thread of the spindle nut.

First claim

The invention claimed is:

1. A spindle drive comprising:
a threaded spindle with an external thread,
a spindle nut with an internal thread that is in engagement with the external thread of the threaded spindle,

characterized in that
the external thread of the threaded spindle has multiple threaded areas that are separated from each other by first flattenings on the circumference of the threaded spindle and extending in the longitudinal direction, and
the first flattenings have guide areas that abut the core diameter of the internal thread of the spindle nut.

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

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

4. The spindle drive according to claim 1 , in which the first flattenings support guide ribs that have the guide areas on outer ends.

5. The spindle drive according to claim 1 , in which the threaded spindle has only two first flattenings that are diametrically opposite each other, wherein the threaded spindle preferably has only two guide ribs that are diametrically opposite each other.

6. The spindle drive according to claim 4 , in which the guide ribs have a second flattening on each end and, bordering two side edges of the second flattening, guide areas at a distance from a central axis of the threaded spindle corresponding to half of the core diameter of the spindle nut.

7. The spindle drive according to claim 6 , in which the first flattenings are planar surfaces and/or in which the second flattenings are planar surfaces.

8. The spindle drive according to claim 1 , in which the threaded areas of the external thread taper between the first flattenings in a radial direction to the outside.

9. The spindle drive according to claim 1 , in which outer edges of guide ribs and/or transitions from the guide ribs to the first flattenings are rounded.

10. The spindle drive according to claim 1 , in which side edges of thread profiles delimited by the first flattenings are rounded.

11. The spindle drive according to claim 1 , in which transitions of flanks of thread profiles to the core diameter of the threaded spindle and/or edges of the thread profiles in a radial direction are rounded.

12. The spindle drive according to claim 1 , in which the spindle nut is produced from a second plastic and/or from a metal.

13. The spindle drive according to claim 12 , 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.

14. The spindle drive according to claim 1 comprising an electric drive motor that is coupled to the threaded spindle or the spindle nut.

15. The spindle drive according to claim 1 , having a metering device.

16. The spindle drive according to claim 1 , having a measuring device, in particular a micrometer gauge.

17. The spindle drive according to claim 1 , having a dosing device.

Assignees

• Eppendorf Ag

Inventors

• Reichmuth Burkhardt
• Wilth Marc
• Sattler Jörg

Classifications

• F16H25/24 Primary

  Elements essential to such mechanisms, e.g. screws, nuts (F16H25/22 takes precedence) · CPC title

• F16H2025/2081

  Parallel arrangement of drive motor to screw axis · CPC title

• G01N35/10

  Devices for transferring samples {or any liquids} to, in, or from, the analysis apparatus, e.g. suction devices, injection devices {(G01N35/0099 takes precedence)} · CPC title

• B01L3/0227

  Details of motor drive means (B01L3/0231, B01L3/0234 take precedence) · CPC title

• F16H2025/2481

  Special features for facilitating the manufacturing of spindles, nuts, or sleeves of screw devices · CPC title