Patent · US Expired

Ball screw

US7587954B2 · kind B2 · utility

0Cited by

9References

5Claims

0Family size

Assignee

Ina Schaeffler KG · DE

Inventors

Jurgen Osterlanger · Emskirchen, DE
Dieter Adler · Herzogenaurach, DE
Manfred Kraus · Kehl, DE

Key dates

Filing date	May 24, 2004
Grant date	Sep 15, 2009
Priority date	—
Expiry date	Jan 18, 2026

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/19749
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

Ball screw having a spindle nut (2) arranged on a spindle (1), together with balls (3) which are arranged in a series and are capable of rolling in a helical ball track (4), the helical ball track (4) being defined by a thread groove (5) formed on the spindle (1) and by a thread groove (6) formed on the spindle nut (2), the balls (3) arranged in a series being returned in a return duct (7) from an outlet end to an inlet end of the helical ball track (4), the divided circle end play of the series of balls being less than or equal to 0.3 millimeters or the ratio between the pitch of the helical ball track (4) and the diameter of the balls (3) ranging from 1.02 to 1.2 or the thread grooves (5, 6) of the spindle nut (2) and of the spindle (1) in each case having a gothic profile (8, 9), a pressure angle formed by the balls (3) in contact with the gothic profile (8, 9) ranging from 15 to 35 degrees.

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