Ball screw

US6584869B2 · kind B2 · utility

Assignee

• Mannesmann Sachs AG · DE

Inventors

• Wolfgang Grosspietsch · Schweinfurt, DE
• Angelika Ebert · Schonungen, DE
• Markus Heiartz · Schweinfurt, DE
• Wolfgang Reisser · Schweinfurt, DE
• Andreas Dau · Würzburg, DE
• Paul Kraus · Niederwerrn, DE
• Thomas John · Augsburg, DE

Key dates

• Filing date: Jul 18, 2001
• Grant date: Jul 1, 2003
• Expiry date: Jul 25, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/19744
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A ball screw includes a spindle element which has a first groove arrangement on an outer circumferential surface, a nut element which surrounds the spindle element and has a second groove arrangement on an inner circumferential surface, and a plurality of balls, at least some of which engage into the first groove arrangement and the second groove arrangement. The nut element is rotatable about an axis of rotation with respect to the spindle element, and, during the rotation of the nut element about the axis of rotation with respect to the spindle element, the balls which engage into the first groove arrangement and the second groove arrangement roll in the first and the second groove arrangement, while at the same time rotate about respective ball axes of rotation. In this case, there is provision, with respect to the ball axis of rotation, for an effective ball rolling radius with which the balls roll in the first groove arrangement to be smaller than the effective ball rolling radius with which the balls roll in the second groove arrangement.