公开(公告)号：US11835116B1

公开(公告)日：2023-12-05

申请号：US17991570

申请日：2022-11-21

Applicant: HIWIN TECHNOLOGIES CORP.

Inventor： Szu-Wei Yu ,  Chih-Ching Tsai ,  Shang-Hua Tsai

IPC: F16H25/20 ,  F16H25/22

CPC classification number: F16H25/2214

Abstract: An inner circulation ball screw includes a screw shaft, a nut, and a return member. The nut is disposed on the screw shaft to form a load path with the screw shaft. The return member is disposed in an accessory slot of the nut to form a non-load path connected with the load path to form a circulation path for circulation of balls. The return member has a ball-discharging channel provided with one end connected with an ineffective thread section of the nut and the other end communicating with a ball-discharging hole of the nut. Therefore, the balls are allowed to move to the outside of the nut through the ball-discharging channel and the ball-discharging hole for preventing the balls from being stuck in the ineffective thread section, thereby solving the problems of high resistance and damaging to related accessories.