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.

公开(公告)号：US09897181B1

公开(公告)日：2018-02-20

申请号：US15460225

申请日：2017-03-15

Applicant: HIWIN TECHNOLOGIES CORP

Inventor： Ming-Yao Lin ,  Ivan Yang

IPC: F16H25/22

CPC classification number: F16H25/2223 ,  F16H35/18

Abstract: An external circulation ball screw includes an elongate shaft having has an outer circumferential surface formed with a helical rolling groove; a nut having a through hole formed therein for receiving extension of the elongate shaft therethrough, the through hole having an inner circumferential surface formed with a rolling channel corresponding to the rolling groove, the rolling groove and the rolling channel collectively defining a loading passage, the nut having an outer surface, which includes, formed therein, two through apertures that are spaced from each other and in communication with the through hole and a cavity in communication with the two through apertures; rolling elements arranged in the loading passage and having a diameter between 0.3-1 mm; and a circulator having a U-shape and is arranged in the cavity and the through apertures and formed with a return passage connected to the loading passage to collectively define a circulation channel.