公开(公告)号：US12072004B1

公开(公告)日：2024-08-27

申请号：US18292008

申请日：2023-04-04

Applicant: NSK LTD.

Inventor： Motoshi Sakai

IPC: F16H25/22 ,  F16H25/20

CPC classification number: F16H25/2214 ,  F16H25/2015

Abstract: A linear actuator of the present disclosure includes a ball screw device, a piston, and a rotation stopper. A screw shaft includes a screw shaft body, a male spline portion, and a step surface. A nut includes a first end surface, a first opening portion, and a first stopper. The piston includes a piston body, a cylindrical portion having a cylindrical shape, protruding in a second direction from a central portion of an opposite surface, and fitted into the male spline portion, and a second stopper protruding in the second direction from the opposite surface. The first stopper and the second stopper abut on each other and form the rotation stopper when the screw shaft is at an initial position. The step surface is arranged in the second direction compared to the first opening portion and is located inside the nut when the screw shaft is at the initial position.

公开(公告)号：US11384821B2

公开(公告)日：2022-07-12

申请号：US17419520

申请日：2020-02-12

Applicant: NSK LTD.

Inventor： Kanta Sato ,  Yasuaki Abe ,  Kazuya Yamada ,  Motoshi Sakai

IPC: F16H25/20 ,  F16H25/22

Abstract: A ball screw device includes: a screw shaft the outer peripheral surface of which has a first thread groove; a nut the inner peripheral surface of which is provided with a second thread groove that matches the first thread groove, and the outer peripheral surface of which is provided with a through hole; a plurality of balls that roll between the first thread groove and the second thread groove; a circulation component including a main body part and a pair of leg parts provided on both ends of the main body part, and that is provided on the nut; and a pin component that fixes the circulation component to the nut. Each of the leg parts is inserted into the through hole, the pin component is provided on the leg part in an overlapping manner, and the leg part is retained in the through hole by the pin component.