公开(公告)号：US20190211906A1

公开(公告)日：2019-07-11

申请号：US15864338

申请日：2018-01-08

Applicant: HIWIN TECHNOLOGIES CORP.

Inventor： Chia-Ming YANG ,  Yen-Wei LIN

IPC: F16H25/22

Abstract: A ball screw includes a load path and a non-load path defined between the screw shaft and the screw nut with the two ends of the non-load path respectively connected to the load path and a reflow channel of the return tube. The ball screw defines an imaginary horizontal plane and an imaginary sloping surface that are intersected with each other at the center axis of the screw shaft. The imaginary horizontal plane passes through the non-load path. The imaginary sloping surface passes through the junction between the non-load path and the load path. The imaginary sloping surface defines a negative included angle within 1˜3 degrees with respect to the imaginary horizontal plane to reduce the impact force rendered by each rolling member to the return tube, enhancing operational smoothness and reducing operational noise.

公开(公告)号：US20200003286A1

公开(公告)日：2020-01-02

申请号：US16025212

申请日：2018-07-02

Applicant: HIWIN TECHNOLOGIES CORP.

Inventor： Yi-Lung SUN ,  Chia-Ming YANG

IPC: F16H25/22

Abstract: An external circulation ball screw consisting of a screw shaft, a screw nut, a cover, two reflow members and multiple rolling members is disclosed. The screw nut defines a mounting groove on the outer perimeter and two return holes in the mounting groove. A first half-return channel on a first step in the mounting groove of the screw nut and a second half-return channel in a second step inside the cover constitute a return channel. Alternatively, a third step can be formed in the cover, or the screw nut can be configured to provide a mounting groove and a third step with return holes in the mounting groove. Thus, same size of reflow members can be used with different lengths of return channels.