公开(公告)号：US11506268B1

公开(公告)日：2022-11-22

申请号：US17449358

申请日：2021-09-29

Applicant: HIWIN TECHNOLOGIES CORP.

Inventor： Ivan Yang ,  Ting-Yuan Chen

IPC: F16H25/20 ,  F16H25/22

Abstract: An external circulation ball screw includes: a screw shaft; a nut sleeved on the screw shaft and including a through hole having an opening end; and a return member mounted on the nut, and including a return groove having a return section and a continuation section, one end of the return section connected to the through hole including a connecting end which abuts against the opening end. The opening end and the connecting end are non-tangentially connected, the return section circles around a reference point, the outer wall surface of the return section is arc-shaped and centered on the reference point, a distance between the outer wall surface and the reference point is a radius of curvature, and the radius of curvature is greater than or equal to 1.2 times the ball diameter, but is less than or equal to 1.5 times the ball diameter.