US 12,085,154 B2
Ball screw device
Ryo Segawa, Fujisawa (JP); and Kazutaka Tanaka, Fujisawa (JP)
Assigned to NSK LTD., Tokyo (JP)
Appl. No. 18/265,810
Filed by NSK LTD., Tokyo (JP)
PCT Filed Jun. 22, 2022, PCT No. PCT/JP2022/024911
§ 371(c)(1), (2) Date Jun. 7, 2023,
PCT Pub. No. WO2023/276822, PCT Pub. Date Jan. 5, 2023.
Claims priority of application No. 2021-109832 (JP), filed on Jul. 1, 2021; and application No. 2021-136413 (JP), filed on Aug. 24, 2021.
Prior Publication US 2024/0052915 A1, Feb. 15, 2024
Int. Cl. F16H 25/20 (2006.01); F16H 25/22 (2006.01); F16H 25/24 (2006.01)
CPC F16H 25/2214 (2013.01) [F16H 25/24 (2013.01); F16H 2025/2075 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A ball screw device comprising:
a screw shaft having a shaft-side ball thread groove having a spiral shape on an outer-circumferential surface thereof, the screw shaft rotationally moving during use,
a nut having a nut-side ball thread groove having a spiral shape on an inner-circumferential surface thereof and a non-rotating side engaging portion having a protruding shape at an end portion on one side in an axial direction, the nut linearly moving during use,
balls arranged between the shaft-side ball thread groove and the nut-side ball thread groove, and
a driving member fixed to the screw shaft so as not to be able to rotate relative to the screw shaft, and rotationally driving the screw shaft,
the driving member having an arc-shaped rotating-side engaging groove portion into which the non-rotating side engaging portion can be inserted in the axial direction, and which can be engaged with the non-rotating side engaging portion in a circumferential direction at an end portion in the circumferential direction, wherein
the rotating-side engaging groove portion is a through groove that penetrates the driving member in the axial direction or a bottomed groove that is open to a side surface on the other side in the axial direction of the driving member.