BALL SCREW DEVICE

Japanese Patent JP2022157719

A

To provide a ball screw device for preventing the separation of a nut and a screw shaft at elongation and preventing the separation of two screw shafts.SOLUTION: A ball screw device comprises: a nut having a first track path; an external peripheral screw shaft having a second track path and a third track path; a plurality of first balls arranged between the first track path and the second track path; an internal peripheral screw shaft having a fourth track path; a plurality of second balls arranged between the third track path and the fourth track path; a first stopper which is fixed so as to be shifted to an end of the external peripheral screw shaft in a first direction; a second stopper fixed so as to be shifted to an end of the internal peripheral screw shaft in a second direction; and a third stopper fixed so as to be shifted to an end of the external peripheral screw shaft in the second direction. A track of the first ball and a track of the second ball are formed into spiral shapes in the same direction. The first stopper has a first protrusion protruding in the second direction, the second stopper has a second protrusion abutting on the first protrusion, the nut has a regulation protrusion protruding in the second direction, and the third stopper has a third protrusion abutting on the regulation protrusion.SELECTED DRAWING: Figure 1

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WATARAI YUSUKE
IKEDA KYOHEI
SUZUKI YUTO
YABE TAKAYUKI

JP2021062108A

October 14, 2022

March 31, 2021

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NSK LTD

F16H25/22; F16H25/24

Sakai International Patent Office

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