logo

For the Inventor, By the Inventor

The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11313444 B1

PDFFull Text
Date of Patent:
Apr. 26, 2022

Filed:

Jul. 23, 2018

Threaded nut of a ball screw drive

Applicant:

Schaeffler Technologies Ag & Co. KG, Herzogenaurach, DE;

Inventors:

Sigurd Wilhelm, Herzogenaurach, DE;

Dieter Adler, Schönwald, DE;

Ernst Strian, Kunreuth, DE;

Assignee:

Schaeffler Technologies AG & Co. KG, Herzogenaurach, DE;

Attorney:

Matthew Evans

Primary Examiner:

Randell J Krug

Int. Cl.
CPC ...
F16H 25/24 (2006.01); B60T 13/10 (2006.01); B60T 13/74 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/38 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/58 (2006.01); F16D 65/14 (2006.01); F16H 25/22 (2006.01); F16D 125/40 (2012.01);
U.S. Cl.
CPC ...
F16H 25/24 (2013.01); B60T 13/10 (2013.01); B60T 13/745 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/38 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/58 (2013.01); F16D 65/14 (2013.01); F16H 25/2204 (2013.01); C21D 2211/008 (2013.01); F16D 2125/40 (2013.01); F16H 2025/2481 (2013.01);
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).

Find Patent Forward Citations

Loading…