公开(公告)号：US20190234505A1

公开(公告)日：2019-08-01

申请号：US16331199

申请日：2017-09-20

Applicant: NSK LTD.

Inventor： Toru ISHII ,  Toru SEGAWA

IPC: F16H57/021 ,  F16H1/16 ,  B62D5/04 ,  F16H57/039 ,  F16H57/031

CPC classification number: F16H57/021 ,  B62D5/0403 ,  B62D5/0409 ,  F16H1/16 ,  F16H55/24 ,  F16H57/031 ,  F16H57/039 ,  F16H57/0498 ,  F16H2057/0213

Abstract: A worm reducer includes: a housing including a wheel accommodating portion, and a worm accommodating portion; a worm wheel including wheel teeth disposed on an outer circumferential surface and rotatably supported inside the wheel accommodating portion; and a worm including worm teeth disposed on an outer circumferential surface to mesh with the wheel teeth and rotatably supported inside the worm accommodating portion, wherein a proximal end portion of the worm is connected to a drive shaft such that torque can be transmitted. An inner circumferential surface of the worm accommodating portion includes a housing side step surface which faces a proximal end side in an axial direction of the worm. An outer circumferential surface of the worm includes a worm side step surface which closely faces the housing side step surface in the axial direction at a portion axially deviated from a portion where the worm teeth are disposed.

公开(公告)号：US20230024110A1

公开(公告)日：2023-01-26

申请号：US17782377

申请日：2020-12-02

Applicant: NSK LTD.

Inventor： Toru ISHII ,  Toru SEGAWA ,  Ryo OSAWA ,  Yuki UCHIYAMA

IPC: B62D5/04 ,  F16D3/68 ,  B62D7/16

Abstract: A torque transmission joint includes a first elastic body having a plurality of first elastic pieces pinched in a circumferential direction between respective first convex portions and a coupling, and a second elastic body having a plurality of second elastic pieces pinched in the circumferential direction between respective second convex portions and the coupling.

公开(公告)号：US20190285157A1

公开(公告)日：2019-09-19

申请号：US16318575

申请日：2017-07-18

Applicant: NSK LTD.

Inventor： Toru SEGAWA ,  Toru ISHll ,  Souta MATSUMOTO

IPC: F16H55/22 ,  F16H1/16

Abstract: Disclosed herein is a worm reduction gear, including: an inner diameter side holder in which a bearing is internally fitted and held; an outer diameter side holder which includes a holder holding part in which the inner diameter side holder is internally fitted and held so as to be able to be relatively rotated and moved and to be displaced in a direction orthogonal to a center axis of a worm wheel and a center axis of a worm, and which is internally fitted and held in a holding recessed part of a housing; and an elastic urging member in a circumferential direction which elastically urges the inner diameter side holder against the outer diameter side holder in a direction of rotating in the circumferential direction. When the inner diameter side holder rotates in the circumferential direction with respect to the outer diameter side holder, an outer circumferential surface of the inner diameter side holder and an inner circumferential surface of the outer diameter side holder are formed so that the bearing is displaced in the direction orthogonal to the center axis of the worm wheel and the center axis of the worm.

公开(公告)号：US20200208727A1

公开(公告)日：2020-07-02

申请号：US16634757

申请日：2018-08-30

Applicant: NSK LTD.

Inventor： Toru SEGAWA

IPC: F16H55/24 ,  F16H1/16 ,  B62D5/04

Abstract: A holder member includes a holder-side holding surface for internally fitting and holding a rolling bearing on a tip end side and a holder-side held surface eccentric to a center axis of the holder-side holding surface. A guide member is internally fitted and held into a guide holding portion of a housing and includes a guide-side holding surface for internally fitting and holding the holder member to be capable of swinging about a center axis of the holder-side held surface. A first elastic urging member elastically urges a tip end portion of a worm toward a worm wheel side by elastically urging the holder member in a direction to rotate with respect to the guide member. Therefore, a structure which can more effectively suppress generation of gear rattle noise at a meshing portion between a wheel tooth and a worm tooth can be realized.

公开(公告)号：US20190211884A1

公开(公告)日：2019-07-11

申请号：US16323942

申请日：2017-08-07

Applicant: NSK LTD.

Inventor： Toru ISHII ,  Toru SEGAWA ,  Ryou OOSAWA ,  Nobuyuki NISHIMURA

IPC: F16D3/74 ,  F16H1/16 ,  B62D5/04

CPC classification number: F16D3/74 ,  B62D5/0403 ,  B62D5/0409 ,  F16D3/68 ,  F16H1/16 ,  F16H55/24

Abstract: A driving-side concave-convex portion of a driving-side transmission member is engaged with an elastic member. The driving-side concave-convex portion is engaged with an intermediate concave-convex portion of an intermediate transmission member with a circumferential gap being interposed therebetween. A driven-side concave-convex portion of a driven-side transmission member is engaged with the elastic member. The driven-side concave-convex portion is engaged with the intermediate concave-convex portion with a circumferential gap being interposed therebetween. Both axial side surfaces and a periphery of the intermediate transmission member are covered by a side surface covering portion and a periphery covering portion of the elastic member.

公开(公告)号：US20170144695A1

公开(公告)日：2017-05-25

申请号：US15327074

申请日：2015-04-24

Applicant: NSK LTD.

Inventor： Toru SEGAWA

IPC: B62D5/04 ,  F16H57/12 ,  F16H57/00 ,  F16H1/16

CPC classification number: B62D5/0454 ,  B62D5/0409 ,  F16C19/06 ,  F16C23/08 ,  F16C27/066 ,  F16H1/16 ,  F16H55/566 ,  F16H57/0006 ,  F16H57/022 ,  F16H57/12 ,  F16H2057/0213 ,  F16H2057/0222 ,  F16H2057/127

Abstract: A slide member (26) is externally fitted to an outer peripheral surface of an outer ring (20) configuring a tip side bearing (9a) for supporting a tip portion of a worm shaft (6a) so as to be displaceable in an axial direction. A first inclined cylindrical face portion (32) which is an inclined surface disposed on an outer peripheral surface of the slide member (26), and a second inclined cylindrical face portion (30) which is an inclined surface disposed on an inner peripheral surface of a guide member (28) internally fitted and fixed to a holding hole (10a) of a housing (3a) are fitted to each other so as to be slidable in an inclined direction of the respective inclined cylindrical face portions (32, 30). An elastic ring (29) which biases a bearing holding member (26) against to one side in the axial direction is disposed. This realizes a structure which can shorten an axial dimension of a tip side portion of the worm shaft in an electric power steering device including biasing means for minimizing backlash in a meshing portion of a worm reduction gear.

公开(公告)号：US20180195602A1

公开(公告)日：2018-07-12

申请号：US15571404

申请日：2016-04-28

Applicant: NSK LTD.

Inventor： Toru SEGAWA

IPC: F16H57/12 ,  B62D5/04 ,  F16H1/16 ,  F16H57/039 ,  F16H57/022 ,  F16H55/24

CPC classification number: F16H57/12 ,  B62D5/04 ,  B62D5/0403 ,  B62D5/0409 ,  F16C19/06 ,  F16C23/08 ,  F16C23/084 ,  F16C2361/61 ,  F16H1/16 ,  F16H55/24 ,  F16H57/022 ,  F16H57/039 ,  F16H2057/02034 ,  F16H2057/0213 ,  F16H2057/0222 ,  F16H2057/127

Abstract: The present invention provides a structure which reduces an axial dimension of a front end-side portion of a worm shaft in a worm reducer including a pressing means for reducing backlash at a meshing portion. The worm reducer includes a coil spring for pressing a rocking member, which is provided to be rockable about a rocking shaft, to one side in a rocking direction about the rocking shaft. The worm reducer further includes a guide member configured such that, as the rocking member rocks to the one side in the rocking direction about the rocking shaft, the worm shaft is moved in a meshing direction which is a direction in which the worm shaft comes close to a worm wheel and is pressed by the guide member in the meshing direction through a front end-side bearing for supporting a front end of the worm shaft.

公开(公告)号：US20180172134A1

公开(公告)日：2018-06-21

申请号：US15525770

申请日：2015-12-08

Applicant: NSK LTD.

Inventor： Toru SEGAWA ,  Seiji UENO

IPC: F16H57/022 ,  F16H57/039 ,  F16H1/16 ,  F16H57/12

CPC classification number: F16H57/022 ,  B62D5/0409 ,  F16C19/06 ,  F16C35/067 ,  F16C2361/61 ,  F16H1/16 ,  F16H57/039 ,  F16H57/12 ,  F16H2057/0213 ,  F16H2057/0222 ,  F16H2057/126

Abstract: A worm reducer which can be easily reduced in size is provided. A flange portion (30) which radially protrude outward is formed on an outer circumferential surface of an axial one end portion of an outer ring (19a) configuring a rolling bearing (18c) on an axial one side at an entire circumference. A holding portion (20a) is formed on an axial one end side portion of a worm accommodation portion (15a). The flange portion (30) is sandwiched in an axial direction between an axial one side face of a housing (12a) and a retaining plate (33) fixed and supported on the housing.

公开(公告)号：US20170210412A1

公开(公告)日：2017-07-27

申请号：US15500295

申请日：2015-04-24

Applicant: NSK LTD.

Inventor： Toru SEGAWA

IPC: B62D5/04 ,  F16H55/24 ,  F16H1/16

CPC classification number: B62D5/0409 ,  B62D5/04 ,  B62D5/0454 ,  F16H1/16 ,  F16H55/24

Abstract: An electric power steering device includes a housing, a rotating shaft for steering, a worm wheel, a worm shaft, a tip side bearing, an electric motor, and biasing mechanism. The biasing mechanism includes a wedge piece and an elastic member for a wedge piece. The wedge piece is disposed between an outer circumferential surface of the tip side bearing and an inner circumferential surface of the housing in a state where the wedge piece in a circumferential direction is displaceable. The elastic member for a wedge piece applies elastic force toward one circumferential side to the wedge piece.

公开(公告)号：US20190264751A1

公开(公告)日：2019-08-29

申请号：US16307633

申请日：2017-10-12

Applicant: NSK LTD.

Inventor： Ryou OOSAWA ,  Toru SEGAWA ,  Toru ISHII

IPC: F16D3/74 ,  B62D5/04 ,  F16H1/16 ,  F16H57/12

Abstract: A first concave-convex portion of a first transmission member is engaged with an intermediate concave-convex portion of an intermediate transmission member with a circumferential gap being therebetween. A second concave-convex portion of a second transmission member is engaged with the intermediate concave-convex portion with a circumferential gap being therebetween. A first elastic member and a second elastic member are engaged with a first engagement portion and a second engagement portion of the intermediate transmission member such that separation between the intermediate transmission member and the first elastic member and the second elastic member can be prevented.