公开(公告)号：US20230349453A1

公开(公告)日：2023-11-02

申请号：US18026463

申请日：2021-10-20

Applicant: NSK LTD.

Inventor： Reona UMEI ,  Yasumi WATANABE ,  Yuji SHIMOMURA

IPC: F16H25/22 ,  F16H25/20 ,  F16H25/24

CPC classification number: F16H25/2204 ,  F16H25/2015 ,  F16H25/24 ,  B60T13/745 ,  F16H2025/2081

Abstract: A linear motion actuator has a ball screw device having a screw shaft, a nut, and a plurality of balls, a piston mounted on one end of the screw shaft, and a stroke limiting mechanism setting an operation starting point in time of the screw shaft toward a first direction pointed by the one end. The nut has one end face directed to the first direction and a protruding part protruding from the one end face.

公开(公告)号：US20250137515A1

公开(公告)日：2025-05-01

申请号：US18833017

申请日：2023-01-19

Applicant: NSK Ltd.

Inventor： Kanta SATO ,  Yasuaki ABE ,  Yasumi WATANABE

IPC: F16H25/22 ,  F16H25/24

Abstract: A ball screw device of the present disclosure includes: a screw shaft in which an outer peripheral raceway surface is provided on an outer peripheral surface; a nut into which the screw shaft is inserted and in which an inner peripheral raceway surface is provided on an inner peripheral surface; a plurality of balls arranged on a raceway between the outer peripheral raceway surface and the inner peripheral raceway surface; and at least one deflector provided with an S-shaped groove surface that circulates the balls. The outer peripheral surface of the screw shaft is provided with a recess portion that is recessed to an inner side in a radial direction and that houses the deflector, and an inner peripheral surface of the recess portion and an outer peripheral surface of the deflector are not circular when viewed from an outer side in the radial direction of the screw shaft.

公开(公告)号：US20240209927A1

公开(公告)日：2024-06-27

申请号：US18288726

申请日：2022-12-06

Applicant: NSK Ltd.

Inventor： Shuhei YUMIBA ,  Yasumi WATANABE ,  Yasuaki ABE

IPC: F16H25/22

CPC classification number: F16H25/2214

Abstract: The nut according to the present disclosure includes a nut main body and a circulation component. The nut main body includes a housing part having a bow shape when viewed from an axial direction, a seat surface forming a bottom surface of the housing part, a through hole passing through the seat surface, and a pair of side surfaces arranged on both sides in the axial direction with respect to the housing part.

公开(公告)号：US20240026959A1

公开(公告)日：2024-01-25

申请号：US18265557

申请日：2022-08-03

Applicant: NSK LTD.

Inventor： Yasumi WATANABE ,  Ryo SEGAWA ,  Tomoko MIYAMORI

IPC: F16H25/22 ,  F16H25/20

CPC classification number: F16H25/2204 ,  F16H25/2015 ,  F16H2025/204

Abstract: The nut has a first fitting surface provided with a first retaining ring groove on an end portion on the other side in the axial direction; the fitting cylinder, at an end portion on the one side in the axial direction, has a second fitting surface provided with a second retaining ring groove in a portion facing the first retaining ring groove with regard to a radial direction; and the retaining ring is engaged so as to span between the first retaining ring groove and the second retaining ring groove.