Roller screw

Details Roller screw Roller screw

2004-09-02

2010-11-16

Ridley, Richard W (Department: 3656)

Machine element or mechanism

Gearing

Directly cooperating gears

C074S424820, C074S424860

Reexamination Certificate

active

07832300

ABSTRACT:
There is provided a roller screw comprising a screw shaft1having an outer peripheral surface in which a spiral roller rolling groove1ais formed, a nut member2having an inner peripheral surface in which a spiral loaded roller rolling groove2ais formed so as to oppose to the roller rolling groove of the screw shaft, a return pipe4in which a roller return passage5is formed so as to connect one and another ends of a loaded roller rolling passage3between the roller rolling groove1aof the screw shaft1and the loaded roller rolling groove2aof the nut member2, a number of rollers6disposed in the loaded roller rolling passage3and the roller return passage5, wherein the roller return passage5is twisted so that an attitude of the roller6changes as the roller moves in an axial direction of the return pipe4. Such roller screw enables to provide an easy assembling and compact structure and to realize smooth circulation of the roller.

REFERENCES:
patent: 3055230 (1962-09-01), Strassberg
patent: 3192791 (1965-07-01), Greby
patent: 4750378 (1988-06-01), Sheppard
patent: 6978693 (2005-12-01), Ohkubo
patent: 2001/0017062 (2001-08-01), Nishimura et al.
patent: 2001/0038724 (2001-11-01), Murata
patent: 2003/0172759 (2003-09-01), Hayashi
patent: 11-62962 (1999-03-01), None
patent: 11-210858 (1999-08-01), None
patent: 2001-263445 (2001-09-01), None
International Search Report dated Dec. 14, 2004 of PCT/JP2004/012748.

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