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US 2004/0200303 A1Published application
Ball screw device
AssigneeKoyo Seiko Co., Ltd.
InventorsMasahiro Inoue, Isao Usuki, Tatsuyuki Miki
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Abstract
A ball screw device comprises a nut having a thread groove in the inner peripheral surface thereof, a screw shaft having a thread groove in the outer peripheral surface thereof and a plurality of balls interposed between the respective thread grooves. In the screw shaft, the thread groove is of at least substantially one turn. In the screw shaft is provided a ball circulation groove for coupling the downstream and upstream sides of the thread groove so that the balls are returned to the upstream side from the downstream side so as to be thereby circulated.
Claims5
A ball screw device comprising:
- a nut having a thread groove in an inner peripheral surface thereof;
- a screw shaft having a thread groove in an outer peripheral surface thereof;
- and
- a plurality of balls interposed between the respective thread grooves, wherein
- in the screw shaft are provided at least substantially one turn of the thread groove and a ball circulation groove for coupling downstream and upstream sides of the thread groove so that the balls are returned to the upstream side from the downstream side so as to be thereby circulated.
2 more elements
Dependencies are inferred from the claim text.