Title:
BALL SCREW DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/048362
Kind Code:
A1
Abstract:
This ball screw device prevents contact of a ball rolling within an unloaded passage with a corner section of a nut member exposed to the interior of the passage, and enables favorable rolling conditions of the ball to be maintained over a long period. The nut member comprises: a nut body that has a pair of ball circulation holes which pass through in a radial direction so as to correspond to both ends of a loaded passage, and that has a ball return groove formed between the pair of ball circulation holes; a pair of circulation members that are mounted in the pair of ball circulation holes of the nut body and that has formed therein first direction-changing grooves; and a lid member that is installed on the nut body so as to cover the ball return groove and the pair of circulation members, that has a guide groove which, by overlapping with the ball return groove, forms a return passage, and that has a second direction-changing groove which, by continuing from the guide groove and overlapping with the first direction-changing grooves of the circulation members, forms a direction-changing path. The groove width of the ball return groove is set to be greater than the groove width of the guide groove.
Inventors:
NAKAMURA FUTOSHI
Application Number:
PCT/JP2023/030105
Publication Date:
March 07, 2024
Filing Date:
August 22, 2023
Export Citation:
Assignee:
THK CO LTD (JP)
International Classes:
F16H25/22; F16H25/24
Domestic Patent References:
| WO2013112597A1 | 2013-08-01 |
Foreign References:
| JP3232612U | 2021-06-24 | |||
| CN110541917A | 2019-12-06 | |||
| JP2019086068A | 2019-06-06 |
Attorney, Agent or Firm:
IDE Tetsuroh (JP)
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