Ball screw device

Details Ball screw device Ball screw device

2011-01-18

2011-01-18

Joyce, William C (Department: 3656)

Machine element or mechanism

Gearing

Directly cooperating gears

C074S424860, C074S424870

Reexamination Certificate

active

07870806

ABSTRACT:
The invention relates to a ball screw device in which a screw shaft and a nut member are threadedly engaged with each other through a number of balls. In such a ball screw device, an inner surface of a cover plate contacting an end surface of a nut main body is provided with a projecting return piece adapted to be fit-engaged with a recess cut in an inner peripheral surface of the nut main body, the return piece being provided with a scoop portion for dislodging the balls from the ball rolling groove of the screw shaft and a direction switching passage for guiding the dislodged balls to the entrance of a ball return hole. The projecting return piece is divided into a first piece formed integral with the cover plate and a second piece fixed to the first piece by a curved plane including the center line of the direction switching passage.

REFERENCES:
patent: 4148226 (1979-04-01), Benton
patent: 4795172 (1989-01-01), Brande
patent: 5492036 (1996-02-01), Sato
patent: 5988007 (1999-11-01), Nishimura
patent: 6176149 (2001-01-01), Misu
patent: 6561053 (2003-05-01), Greubel
patent: 05-003715 (1993-01-01), None
patent: 06-201013 (1994-07-01), None
patent: 11-051145 (1999-02-01), None
patent: 2000-337470 (2000-12-01), None
patent: 2001-122138 (2001-05-01), None
patent: WO-97/48922 (1997-12-01), None
International Search Report for PCT/JP02/08917 mailed on Dec. 10, 2002.

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