US 12,117,069 B2
Linear motion device
Mizuho Yamasaki, Yamanashi-ken (JP); and Hisanori Kouda, Yamanashi-ken (JP)
Assigned to FANUC CORPORATION, Yamanashi (JP)
Appl. No. 18/021,327
Filed by FANUC CORPORATION, Minamitsuru-gun (JP)
PCT Filed Aug. 16, 2021, PCT No. PCT/JP2021/029854
§ 371(c)(1), (2) Date Feb. 14, 2023,
PCT Pub. No. WO2022/039117, PCT Pub. Date Feb. 24, 2022.
Claims priority of application No. 2020-140129 (JP), filed on Aug. 21, 2020.
Prior Publication US 2023/0296164 A1, Sep. 21, 2023
Int. Cl. F16H 25/22 (2006.01); F16H 25/20 (2006.01)
CPC F16H 25/2204 (2013.01) [F16H 2025/2031 (2013.01); F16H 2025/2075 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A linear motion device comprising:
a ball screw;
a nut configured to move with respect to the ball screw in an axial direction thereof in accordance with rotation of the ball screw;
a bearing mounted on an outer periphery of the ball screw;
a housing configured to support the ball screw through the bearing;
a nut holder configured to hold the nut therein and through which the ball screw passes; and
a restricting member that has a through hole in a center portion thereof, is disposed between the bearing and the nut holder, is fixed to the housing in a state where the ball screw is inserted into the through hole, and restricts movement of the bearing in the axial direction in the housing,
wherein the restricting member includes a cutout portion extending in a radial direction from an inner peripheral surface of the through hole to an outer peripheral surface of the restricting member, and
wherein the ball screw includes a planar portion formed by partially cutting out a part of an outer peripheral surface of the ball screw.