Patent · US Active

Threaded nut of a ball screw drive

US11313444B2 · kind B2 · utility

0Cited by

1References

14Claims

0Family size

Assignee

Schaeffler Technologies AG & Co. KG · DE

Inventors

Sigurd Wilhelm · Herzogenaurach, DE
Dieter Adler · Herzogenaurach, DE
Ernst Strian · Gräfenberg, DE

Key dates

Filing date	Jul 23, 2018
Grant date	Apr 26, 2022
Priority date	—
Expiry date	Jul 23, 2038

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2025/2481
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A threaded nut of a ball-screw for a brake booster is constructed as a hydraulic piston and is produced from the group of martensitically hardening steels which are non-corroding with respect to brake fluid and which has in percent by weight: between 0.4% and 1.3% carbon (C), up to 2% silicon (Si), up to 2% manganese (Mn), between 12% and 20% chromium (Cr), and phosphorus (P) and sulphur (S) together at less than 0.015%, the balance being iron and, where applicable, melting-related impurities. Addition of the following materials to the above-described steel may be advantageous: up to 2% molybdenum (Mo), up to 0.2% vanadium (V), and up to 3% nickel (Ni).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.