Ball screw device
AssigneeJtekt Corporation
InventorGento ARAMOTO
Life of this patent
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Abstract
A ball screw device includes a screw shaft that has a first helical groove on an outer circumference, a nut that has a second helical groove on an inner circumference, a plurality of balls, a stopper provided at an end portion of the second helical groove, and a spring body that is placed between an end portion ball closest to the stopper and the stopper. The spring body is configured of a plurality of coil springs arrayed along the first helical groove and the second helical groove. The coil springs that are adjacent each have a spring end portion of which rigidity is higher than rigidity of a spring middle portion.
Claims6
A ball screw device comprising:
- a screw shaft that has a first helical groove on an outer circumference;
- a nut that is provided on the outer circumferential side of the screw shaft and that has a second helical groove on an inner circumference;
- a plurality of balls that are provided between the first helical groove and the second helical groove;
- a stopper that is provided at an end portion of the second helical groove;
- and
- a spring body that is placed between an end portion ball closest to the stopper out of the plurality of balls and the stopper, wherein
- the spring body is configured of a plurality of coil springs arrayed along the first helical groove and the second helical groove,
- the coil springs that are adjacent are in contact with each other, and
- the coil springs that are adjacent each have a spring end portion of which rigidity is higher than rigidity of a spring middle portion.
Dependencies are inferred from the claim text.