Ball screw mechanism for electric power steering apparatus

Details Ball screw mechanism for electric power steering apparatus Ball screw mechanism for electric power steering apparatus

2008-01-29

2008-01-29

Fenstermacher, David M. (Department: 3682)

Machine element or mechanism

Gearing

Follow-up mechanism

C074S424830

Reexamination Certificate

active

07322256

ABSTRACT:
A first ball circulating hole and a second ball circulating hole for connecting a circulator are bored midway at a screw groove formed on an inner circumference of a ball nut, an intermediate groove path between the first and second ball circulating holes becomes the range of a ball screw track for circulating balls, and other ranges become a first outer track and a second outer track which are not the ball screw track. By making the groove depth of the intermediate groove path deeper than the groove depth of a first groove path of the first outer track and the groove depth of a second groove path of the second outer track, steps are formed between the ball screw track and the two outer tracks. These steps prevent an outflow of the balls from the intermediate groove path to the respective groove paths of the outer tracks.

REFERENCES:
patent: 2780943 (1957-02-01), Stump
patent: 3661030 (1972-05-01), Gagne
patent: 5586469 (1996-12-01), Mitani et al.
patent: 6454042 (2002-09-01), Yoshida et al.
patent: 2002/0003059 (2002-01-01), Yoshioka et al.
patent: 2002/0063014 (2002-05-01), Yoshida et al.
patent: 0673827 (1995-09-01), None
patent: 1 293 706 (2003-03-01), None
patent: 2002-087288 (2002-03-01), None

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