Title:
BALL SCREW DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/210747
Kind Code:
A1
Abstract:
This ball screw device comprises a screw shaft, a nut, and a plurality of balls. An outer circumferential raceway surface is provided to the outer circumferential surface of the screw shaft. An inner circumferential raceway surface is provided to the inner circumferential surface of the nut, and the screw shaft passes through the nut. The nut has at least three circulation units. The raceway has at least three ball circuits corresponding to each circulation unit. The at least three ball circuits have, in the axial direction parallel to the center axis of the screw shaft, a center circuit positioned in the center region of the nut, a first circuit positioned further along the first direction than the center circuit, and a second circuit positioned further along the second direction than the center circuit. The effective diameter of each thread of the outer circumferential raceway surface is equal. From among the inner circumferential raceway surfaces, the effective diameter of the center inner circumferential raceway surface of the center circuit is different from that of the first inner circumferential raceway surface of the first circuit and that of the second circumferential raceway surface of the second circuit.
Inventors:
ABE DAISUKE (JP)
TAKAHASHI DAIJYU (JP)
TAKAHASHI DAIJYU (JP)
Application Number:
PCT/JP2022/015605
Publication Date:
October 06, 2022
Filing Date:
March 29, 2022
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
F16H25/22; F16H25/24
Foreign References:
| JP2019015318A | 2019-01-31 | |||
| JP3381735B2 | 2003-03-04 | |||
| JP2004306728A | 2004-11-04 | |||
| JP2003049920A | 2003-02-21 | |||
| JP3381735B2 | 2003-03-04 |
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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