公开(公告)号：US20230133413A1

公开(公告)日：2023-05-04

申请号：US17925512

申请日：2022-04-14

Applicant: NSK LTD

Inventor： Ryo SEGAWA

IPC: F16H25/22

Abstract: A ball screw device having a screw shaft rotating during use, a nut moving linearly during use, balls, a fitting cylinder fixed to the nut, a housing, and an anti-rotation member, a first member, which is one of the nut and the fitting cylinder, having a retaining concave portion engaging with a radially inner portion of the anti-rotation member and including a closed surface, an insertion hole of the housing having a guide concave groove engaging with a radially outer portion of the anti-rotation member, the radially inner portion held between the closed surface and an axially end surface a second member, which is the other of the nut and the fitting cylinder, the radially outer portion being able to slide in the guide concave groove.

公开(公告)号：US20240376969A1

公开(公告)日：2024-11-14

申请号：US18290108

申请日：2022-12-12

Applicant: NSK LTD.

Inventor： Ryo SEGAWA

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

Abstract: A ball screw device has a screw shaft that has a screw portion having a spiral-shaped shaft-side ball screw groove on an outer peripheral surface thereof, and a carrier integrally formed with the screw portion and constituting a planetary speed-reducing mechanism; a nut that has a spiral-shaped nut-side bass screw portion on an inner peripheral surface thereof; a plurality of balls arranged between the shaft-side ball screw groove and the nut-side ball screw groove; and a rolling bearing for supporting the carrier which has an outer ring having an outer ring raceway, an inner ring raceway provided on a portion facing the outer ring raceway in a radial direction, and a plurality of rolling bodies arranged between the outer ring raceway and the inner ring raceway, which is directly formed on an outer peripheral surface of the carrier.

公开(公告)号：US20250075778A1

公开(公告)日：2025-03-06

申请号：US18726293

申请日：2022-12-06

Applicant: NSK LTD.

Inventor： Ryo SEGAWA

IPC: F16H25/24 ,  F16C33/58 ,  F16H25/22

Abstract: A ball screw device having a screw shaft, a nut, a plurality of balls, a carrier constituting a planetary reduction mechanism, a rolling bearing for rotatably supporting the carrier, where the screw shaft includes a screw portion having a spiral-shaped shaft-side ball screw groove on an outer circumferential surface thereof, and a fitting shaft portion, the carrier is fixed to the fitting shaft portion such that relative rotation is not possible, an inner ring raceway of the rolling bearing is formed directly on an outer circumferential surface of the carrier.

公开(公告)号：US20230375081A1

公开(公告)日：2023-11-23

申请号：US18030200

申请日：2022-06-16

Applicant: NSK LTD.

Inventor： Ryo SEGAWA

IPC: F16H25/22

CPC classification number: F16H25/2214

Abstract: The ball screw device has a nut having a guide concave groove on the outer-circumferential surface capable of engaging with a rotation restraining member in the circumferential direction, a housing provided with an insertion hole having a retaining concave groove on the inner-circumferential surface capable of engaging with the rotation restraining member in the circumferential direction, the rotation restraining member configured by a shaft-shaped member extending in the axial direction, the rotation restraining member having an outside portion in the radial direction arranged inside the retaining concave groove and an inside portion in the radial direction arranged inside the guide concave groove, so as to be able to slide in the axial direction.

公开(公告)号：US20240352993A1

公开(公告)日：2024-10-24

申请号：US18682598

申请日：2023-05-11

Applicant: NSK LTD.

Inventor： Ryo SEGAWA ,  Yuta NAKABAYASHI

IPC: F16H25/20 ,  F16D1/10 ,  F16H25/24

CPC classification number: F16H25/20 ,  F16D1/10 ,  F16D2001/103 ,  F16H2025/2075 ,  F16H2025/2087 ,  F16H2025/2481

Abstract: A fitting shaft portion has an inner-diameter side engaging portion on an outer peripheral surface with external teeth arranged in a circumferential direction; a fitting member has an outer-diameter side engaging portion on an inner peripheral surface with internal teeth arranged in the circumferential direction and engaging with the inner-diameter side engaging portion; an engaging portion between the inner-diameter side engaging portion and the outer-diameter side engaging portion includes a portion having interference in the radial direction in a portion in the axial direction; and the fitting shaft portion has a crimped portion at an end portion on one side in the axial direction that engages in the axial direction with the fitting member.

公开(公告)号：US20230383826A1

公开(公告)日：2023-11-30

申请号：US18030012

申请日：2022-04-11

Applicant: NSK LTD.

Inventor： Ryo SEGAWA

IPC: F16H25/24 ,  F16H25/22

CPC classification number: F16H25/24 ,  F16H25/2204 ,  F16H2025/2481

Abstract: A ball screw device that is capable of transmitting an axial load between the screw portion and the holding member without shortening the life of the ball screw device is provided.
The stopper 5 is externally fitted to the fitting shaft portion 10 of the screw shaft 2 having an outer diameter smaller than that of the screw portion 9, which is provided adjacent to one side in the axial direction of the screw portion 9 provided with the shaft-side ball thread groove 12 on the outer-circumferential surface, so as not to be able to rotate relative to each other. The driving member 6 which is a holding member is arranged adjacent to the one side in the axial direction of the stopper 5 such that the stopper 5 is held in the axial direction between the driving member 6 and the screw portion 9. An axial load is transmitted between the driving member 6 and the screw portion 9 without applying a moment to the stopper 5.

公开(公告)号：US20240052915A1

公开(公告)日：2024-02-15

申请号：US18265810

申请日：2022-06-22

Applicant: NSK LTD.

Inventor： Ryo SEGAWA ,  Kazutaka TANAKA

IPC: F16H25/22 ,  F16H25/24

CPC classification number: F16H25/2214 ,  F16H25/24 ,  F16H2025/2075

Abstract: A ball screw device has: a screw shaft rotationally moving during use, a nut having a protruding non-rotating side engaging portion at an end portion on one side in an axial direction, the nut linearly moving during use, balls arranged between a shaft-side and nut-side grooves, and a driving member fixed to the screw shaft 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.

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.