公开(公告)号：US20210148437A1

公开(公告)日：2021-05-20

申请号：US16074333

申请日：2017-01-26

Applicant: NSK LTD.

Inventor： Haruhiko KIYOTA ,  Takeshi YAMAMOTO ,  Kaname YASUDA ,  Tomohiro ARAI ,  Junichi TAKANO ,  Kazuki HOTTA

IPC: F16H1/16 ,  F16H55/06 ,  F16H55/22

Abstract: An outer wheel element (16a) formed in an annular shape with a synthetic resin and having a worm wheel tooth part (19a) on an outer circumferential surface thereof embeds a radially outer end part of an inner wheel element (15a) formed in an annular shape with a metal. An outer circumferential surface of the inner wheel element (15a), which is radially superimposed with an engaging part between the worm tooth part (19a) and a the worm wheel tooth part serves as a cylindrical surface part (24). This realizes a structure capable of suppressing manufacturing error of the worm wheel tooth part engaging with the worm tooth part.

公开(公告)号：US20210088112A1

公开(公告)日：2021-03-25

申请号：US16074354

申请日：2017-01-26

Applicant: NSK LTD.

Inventor： Haruhiko KIYOTA ,  Takeshi YAMAMOTO ,  Kaname YASUDA ,  Tomohiro ARAI ,  Junichi TAKANO ,  Kazuki HOTTA

IPC: F16H1/16 ,  B29C45/14 ,  B29C45/27 ,  F16H55/17 ,  F16H55/06 ,  F16C19/16

Abstract: An inner wheel element (15a) is embedded in an outer wheel element (16a), such that a continuous range from an inner diameter side circumferential surface configuring an inner surface of a first annular concave part (22), through an outer circumferential surface of the inner wheel element (15a), to an inner diameter side circumferential surface configuring an inner surface of a second annular concave part (38) in a surface of the inner wheel element (15a) is covered over the entire circumference. Accordingly, a structure is achieved which easily secures a holding power of the synthetic resin outer wheel element with respect to the inner wheel element.

公开(公告)号：US20230272848A1

公开(公告)日：2023-08-31

申请号：US18014611

申请日：2021-05-14

Applicant: NSK LTD.

Inventor： Atsushi MIYAZAKI ,  Tomohiro ARAI ,  Haruhiko KIYOTA ,  Takeshi YAMAMOTO

IPC: F16H55/22 ,  B29C45/27 ,  B29C45/14

CPC classification number: F16H55/22 ,  B29C45/2708 ,  B29C45/14336 ,  F16H1/16

Abstract: A method for manufacturing a worm wheel including an inner wheel element including a side plate portion and a tubular eave portion, and an outer wheel element including a wheel tooth portion on an outer circumferential surface thereof, and coupled and fixed to the inner wheel element in a manner of covering a radially outer portion of the side plate portion and the eave portion, the method includes: molding the outer wheel element by disposing a mold around a radially outer portion of the inner wheel element, and feeding the molten synthetic resin from an annular or arc-shaped injection gate toward a pocket portion that is continuous over an entire circumference of a cavity present between an inner surface of the mold and a surface of the inner wheel element and that is present on a radially inner side of the eave portion.

公开(公告)号：US20210180676A1

公开(公告)日：2021-06-17

申请号：US16074363

申请日：2017-01-26

Applicant: NSK LTD.

Inventor： Haruhiko KIYOTA ,  Takeshi YAMAMOTO ,  Kaname YASUDA ,  Tomohiro ARAI ,  Junichi TAKANO ,  Kazuki HOTTA

IPC: F16H55/22 ,  F16H55/06 ,  F16H1/16 ,  F16C19/36 ,  B29C45/14 ,  B29C45/27

Abstract: A first concave-convex part is formed in an outer diameter side circumferential surface of a first annular concave part provided in an axial one-side surface of an inner wheel element, and a second concave-convex part is formed in a bottom surface of a second annular concave part provided in the axial other-side surface of the inner wheel element. An outer circumferential part of the inner wheel element is embedded in an outer wheel element, and synthetic resin forming the outer wheel element partially enters into a plurality of concave parts constituting the first concave-convex part and the second concave-convex part. Thus, a configuration is achieved in which the holding power of a synthetic resin outer wheel can be secured from the metal inner wheel element, and the manufacturing error can be suppressed in the worm wheel tooth part provided in the outer circumferential surface of the outer wheel.

公开(公告)号：US20190040941A1

公开(公告)日：2019-02-07

申请号：US16076959

申请日：2017-02-15

Applicant: NSK LTD.

Inventor： Haruhiko KIYOTA ,  Takeshi YAMAMOTO ,  Kaname YASUDA ,  Tomohiro ARAI ,  Junichi TAKANO ,  Kazuki HOTTA

IPC: F16H55/06 ,  F16H1/16 ,  F16H55/22

Abstract: Provided is a worm wheel formed by combining a metal part and a synthetic resin part to realize a reduction in weight. The worm wheel (4a) is formed by combining an inner wheel element (15a) and an outer wheel element (16a). The inner wheel element (15a) includes a metal core (24) made of metal and formed in an annular shape, and a resin core (25) made of a synthetic resin and formed in an annular shape to surround an outer circumference of the metal core (24). The outer wheel element (16a) is made of a synthetic resin and formed in an annular shape, includes a worm wheel tooth part (19a) on an outer circumferential surface, and surrounds an outer circumference of the resin core (25).