BALL SCREW DEVICE

WIPO Patent Application WO/2023/234029

A1

This ball screw device comprises: a large number of balls; a screw shaft (110) having an outer circumferential surface on which a rolling groove (111) for the balls is spirally formed; and a nut member (120) having a through hole through which the screw shaft (110) is inserted, the through hole having an inner circumferential surface (240) having a turning groove (210) that causes the large number of balls to make only one circulating turn around the screw shaft (110), the nut member (120) being screwed to the screw shaft (110) via the large number of balls. The turning groove (210) has a load rolling groove (121) facing a part of the rolling groove (111) of the screw shaft (110), and a circulating groove (220) that connects the opposite ends of the load rolling groove (121) across the screw thread of the screw shaft (110). The turning groove (210) is provided adjacent to the opening edge of the through hole of the nut member (120). At a corner part where the inner circumferential surface (240) of the through hole and an axial end surface of the nut member (120) cross is provided with an inclined part (230) formed by cutting the corner part (310) with an uneven width along the circumferential direction of the through hole.

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JP2008100311	BALL SCREW NUT AND MANUFACTURING METHOD THEREOF

AMEMIYA YOHEI
HAYASHI YUKI

PCT/JP2023/018437

December 07, 2023

May 17, 2023

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THK CO LTD (JP)

F16H25/22; F16H25/24

JP2017009097A	2017-01-12
JP2009250345A	2009-10-29

IDE Tetsuroh (JP)

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