公开(公告)号：US20230286089A1

公开(公告)日：2023-09-14

申请号：US18317096

申请日：2023-05-15

申请人： Yamazaki Mazak Corporation

发明人： Shinya NAKAMURA ,  Hiroto SASAKI ,  Kimihiko SATO

IPC分类号： B23Q1/70 ,  B23Q5/04 ,  F16C19/18

CPC分类号： B23Q1/70 ,  B23Q5/04 ,  F16C19/181

摘要： A rotary shaft locking device includes a rotary shaft, a first angular contact ball bearing, a support, and an actuator. The rotary shaft is rotatable about a first axis and has a first contact surface. The first angular contact ball bearing includes an inner ring connected to the rotary shaft, an outer ring, and a plurality of balls disposed between the inner ring and the outer ring. The support has a second contact surface and rotatably supports the rotary shaft via the first angular contact ball bearing. The actuator is configured to move the rotary shaft and the inner ring with respect to the support and the outer ring in a first direction parallel to the first axis so that the first contact surface contacts the second contact surface to prohibit the rotary shaft from rotating and so that precompression that acts on the plurality of balls is reduced.