Electromechanical actuator
AssigneeSchaeffler Technologies AG & Co. KG
InventorsSebastian Krueger, Igor Mys
Life of this patent
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Abstract
An electromechanical actuator includes a planetary rolling screw drive having a plurality of planets, a driven cage guiding the plurality of planets, and a threaded spindle. The threaded spindle has a formed thread with a finish produced by martensite precipitation and strain hardening. The threaded spindle is formed from a steel including 0.4 to 1.5% by weight of Carbon, 12.0 to 22.0% by weight of Manganese, up to 4.0% by weight of Chromium, up to 0.5% by weight of Nickel, up to 0.3% by weight of Copper, up to 0.3% by weight of Vanadium, up to 0.3% by weight of Sulfur, up to 0.1% by weight of Phosphorus, up to 4.0% by weight of Silicon, up to 0.05% by weight of Aluminum, and a remainder of iron and smelting-induced impurities.
Claims15
An electromechanical actuator, comprising a screw drive in the form of a planetary rolling screw drive, wherein the planetary rolling screw drive provided is a true-pitch screw drive having a driven cage, guiding a plurality of planets, and having a threaded spindle, wherein the threaded spindle and/or the planets is/are formed from a steel of the following composition:
- C:
- 0.4 to 1.5% by weight,
- Mn:
- 12.0 to 22.0% by weight,
- Cr:
- up to 4.0% by weight,
- Ni up to 0.5% by weight,
- Cu:
- up to 0.3% by weight,
- V:
- up to 0.3% by weight,
- S:
- up to 0.3% by weight,
- P:
- up to 0.1% by weight,
- Si:
- up to 4.0% by weight,
- Al:
- up to 0.05% by weight,
- remainder:
- iron and smelting-induced impurities,
- on the surface of which there is, at least in the region of a thread produced by a forming process on the threaded spindle and/or the planets, a finish produced by martensite precipitation and strain hardening.
An electromechanical actuator, comprising:
- a planetary rolling screw drive, comprising:
- a plurality of planets;
- a driven cage guiding the plurality of planets;
- and
- a threaded spindle comprising a formed thread having a finish produced by martensite precipitation and strain hardening, the threaded spindle being formed from a steel comprising:
- 0.4 to 1.5% by weight of Carbon;
- 12.0 to 22.0% by weight of Manganese;
- up to 4.0% by weight of Chromium;
- up to 0.5% by weight of Nickel;
- up to 0.3% by weight of Copper;
- up to 0.3% by weight of Vanadium;
- up to 0.3% by weight of Sulfur;
- up to 0.1% by weight of Phosphorus;
- up to 4.0% by weight of Silicon;
- up to 0.05% by weight of Aluminum;
- and
- a remainder of iron and smelting-induced impurities.
Dependencies are inferred from the claim text.