Ball screw

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2006-05-16

2006-05-16

Ridley, Richard W. (Department: 3682)

Machine element or mechanism

Gearing

Directly cooperating gears

C074S424710, C074S089230, C384S450000, C384S520000

Reexamination Certificate

active

07044016

ABSTRACT:
A ball screw having: a screw shaft having a spiral ball rolling groove; a ball nut having a ball rolling groove corresponding to the ball rolling groove; and a large number of balls interposed between the ball rolling grooves so as to roll freely; wherein the ball rolling groove of at least one of the screw shaft and the ball nut is ground so that a maximum value component of a number of undulation peaks per lead in the ball rolling groove is not in a range of from 0.95 nm to 1.05 nm centered on an integral multiple nm of a number m of load balls per lead calculated by an expression:(π⁢⁢dm)2+L2Pin which P is a distance between centers of the adjacent load balls disposed at substantially equal intervals in the ball rolling groove, dmis a ball pitch circle diameter, and L is a lead.

REFERENCES:
patent: 1704031 (1929-03-01), Boehm
patent: 3053105 (1962-09-01), Cole
patent: 3244022 (1966-04-01), Wysong, Jr.
patent: 4638548 (1987-01-01), Miller
patent: 4760635 (1988-08-01), Miller
patent: 5456538 (1995-10-01), Honda et al.
patent: 5615955 (1997-04-01), Namimatsu et al.
patent: 5749265 (1998-05-01), Namimatsu et al.
patent: 5782563 (1998-07-01), Muto et al.
patent: 6082210 (2000-07-01), Ise
patent: 6176149 (2001-01-01), Misu
patent: 2001-263446 (2001-09-01), None
patent: 2001-317605 (2001-11-01), None
patent: 2002-188705 (2002-07-01), None
patent: 2004-36744 (2004-02-01), None
Patent Abstracts of Japan, vol. 0103, No. 57 (M-540), Dec. 2, 1986.

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