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US 2003/0192388 A1Published application
Ball screw mechanism
AssigneeSMC Corporation
InventorsShigekazu Nagai, Ryuuichi Masui
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AssigneeSMC Corporation
InventorsShigekazu Nagai, Ryuuichi Masui
Estimating the term…
A ball screw mechanism includes a ball screw shaft of a metal material coaxially connected to a rotary driving source, a nut member of a resin material being screwed onto the ball screw shaft, a plate member fixed to an upper surface of the nut member by screw members, and steel balls which are arranged on a passage formed in the nut member closed by the plate member and which are installed into screw grooves of the ball screw shaft and the nut member.
A ball screw mechanism comprising:
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
With balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members: with balls
Type of gearings to be lubricated, cooled or heated: screw mechanisms
With balls: with elements for guiding the circulating balls
Screw mechanisms: axial sliding means, i.e. for rotary support and axial guiding of nut or screw shaft
Term end not estimated
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1. Field of the Invention
The present invention relates to a ball screw mechanism for displacing a nut member screwed onto a ball screw shaft in the axial direction driven by a rotary driving source.
2. Description of the Related Art
FIG. 1 is a perspective view illustrating a ball screw mechanism according to an embodiment of the present invention;
FIG. 2 is a longitudinal sectional view illustrating the ball screw mechanism shown in FIG. 1;
FIG. 3 is a magnified longitudinal sectional view illustrating a female screw section of a nut member shown in FIG. 2;
With reference to FIGS. 1 and 2, reference numeral 10 indicates a ball screw mechanism according to an embodiment of the present invention.
The ball screw mechanism 10 comprises a ball screw shaft 14 which is coaxially connected to an unillustrated drive shaft of a rotary driving source 12, a nut member 18 through which a female screw section 16 (see FIG. 2) is formed penetratingly for being screwed with the ball screw shaft 14, and a plate member 20 which closes an installation hole 28 of the nut member 18 as described later on.
As shown in FIG. 2, the ball screw shaft 14, which is formed of a metal material, includes a male screw section 22 engraved on the outer circumferential surface. The ball screw shaft 14 includes connecting sections 24a, 24b which are disposed at both ends and which are diametrally reduced by predetermined lengths for connecting to the rotary driving source 12 or the like. A screw groove (first screw groove) 26a is formed on the male screw section 22. The screw groove 26a has a substantially semicircular cross section so that a plurality of steel balls 30 are arranged thereon.