US 12,233,498 B2
Method of manufacturing ball screw device
Wei Xu, Kanagawa (JP); Takayuki Yabe, Kanagawa (JP); and Toshiaki Suzuki, Tokyo (JP)
Assigned to NSK LTD., Tokyo (JP)
Appl. No. 18/285,118
Filed by NSK Ltd., Tokyo (JP)
PCT Filed Feb. 2, 2022, PCT No. PCT/JP2022/004006
§ 371(c)(1), (2) Date Sep. 29, 2023,
PCT Pub. No. WO2022/209260, PCT Pub. Date Oct. 6, 2022.
Claims priority of application No. 2021-060201 (JP), filed on Mar. 31, 2021.
Prior Publication US 2024/0165753 A1, May 23, 2024
Int. Cl. B23P 15/00 (2006.01); B23P 21/00 (2006.01); F16H 25/22 (2006.01); F16H 25/24 (2006.01)
CPC B23P 21/00 (2013.01) [B23P 15/003 (2013.01); F16H 25/2204 (2013.01); F16H 25/24 (2013.01); Y10T 29/49641 (2015.01); Y10T 29/497 (2015.01); Y10T 29/49853 (2015.01); Y10T 74/19702 (2015.01)] 7 Claims
OG exemplary drawing
 
1. A method of manufacturing a ball screw device, the method comprising:
a nut unit preparation step of preparing a nut unit in which a ball, and a temporary shaft that prevents the ball from falling off are assembled to a nut provided with an inner peripheral track surface;
a screw shaft preparation step of preparing a screw shaft provided with an outer peripheral track surface; and
an assembly step of replacing the temporary shaft of the nut unit with the screw shaft to manufacture a ball screw device after the nut unit preparation step and the screw shaft preparation step,
wherein the nut unit preparation step includes a measurement step of measuring a moving distance, when the ball and a master screw shaft that is a reference are assembled to the nut such that the master screw shaft is moved in an axial direction without rotating while the nut is fixed, and
the screw shaft preparation step includes a measurement step of measuring a moving distance, when a master nut that is a reference is assembled to the screw shaft such that the screw shaft is moved in the axial direction without rotating while the master nut is fixed.