公开(公告)号：US20180266491A1

公开(公告)日：2018-09-20

申请号：US15761208

申请日：2016-08-25

Applicant: NTN CORPORATION

Inventor： Tatsuro SUGIYAMA ,  Ritsuki SAKIHARA

IPC: F16D3/205

CPC classification number: F16D3/2055 ,  F16D2003/2023 ,  F16D2003/2026 ,  F16D2300/10

Abstract: A tripod type constant velocity universal joint includes an outer joint member having track grooves formed at trisected positions in a circumferential direction to extend in an axial direction thereof, and a tripod member. The tripod member includes a trunnion barrel and trunnion journals radially projecting from trisected positions on the trunnion barrel in the circumferential direction. The universal joint also includes spherical rollers each fitted in a rotatable manner about each of the trunnion journals through intermediation of a plurality of needle rollers. The spherical rollers are in the track grooves, and each has an outer spherical surface guided by roller guide surfaces formed on both side walls of each of the track grooves. Hollow holes are formed in the trunnion journals, respectively, and a quench-hardened layer is formed on each of outer circumferential surfaces of the trunnion journals and surfaces of the hollow holes.

公开(公告)号：US20180259002A1

公开(公告)日：2018-09-13

申请号：US15761226

申请日：2016-08-25

Applicant: NTN CORPORATION

Inventor： Tatsuro SUGIYAMA

IPC: F16D3/205

CPC classification number: F16D3/2055 ,  F16D2250/0053

Abstract: A tripod type constant velocity universal joint has an inner circumferential surface of each inner ring which is configured to rotatably support a roller formed to have an arc-shaped protruding section, and an outer circumferential surface of each leg shaft of a tripod member formed to have a straight shape in longitudinal section and a substantially elliptical shape in transverse section. The outer circumferential surface of the leg shaft and the inner circumferential surface of the inner ring are held in contact with each other in a direction orthogonal to an axis of the joint and have a gap between the outer circumferential surface and the inner circumferential surface in an axis direction of the joint. The leg shaft has a hollow hole in which a quench-hardened layer is formed on the outer circumferential surface of the leg shaft and a surface of the hollow hole.

公开(公告)号：US20170234836A1

公开(公告)日：2017-08-17

申请号：US15502872

申请日：2015-07-23

Applicant: NTN CORPORATION

Inventor： Hiromi NAGAI ,  Daisuke KAGAWA ,  Naoki NAKAGAWA ,  Takashi IMANAKA ,  Yasuhiko SAKAKIBARA ,  Tokio UEDA ,  Masazumi KOBAYASHI ,  Tatsuro SUGIYAMA

IPC: G01N29/04 ,  G01N21/95

Abstract: An inspection device inspects a joint-type outer joint member of a constant velocity universal joint that includes a cup section having a bottomed cylindrical shape and track grooves in an inner periphery thereof for torque transmitting elements, and a shaft section extending from a bottom of the cup section. The inspection device inspects the outer joint member, which is obtained through melt-welding on a cup member forming the cup section and a shaft member forming the shaft section. The inspection device includes a surface inspection unit to inspect for a defect which appears on a surface of the outer joint member due to welding, an internal inspection unit to inspect for an internal defect of a welded portion, and a recording unit to record an inspection result of the inspection. The inspection device is configured to efficiently perform in-line total inspection for the melt-welded joint-type outer joint member.

公开(公告)号：US20180045249A1

公开(公告)日：2018-02-15

申请号：US15556156

申请日：2016-02-25

Applicant: NTN CORPORATION

Inventor： Tatsuro SUGIYAMA ,  Hiroaki MAKINO

IPC: F16D3/205

Abstract: Provided is a tripod type constant velocity universal joint, including: an outer joint member having track grooves; a tripod member including trunnion journals; and spherical rollers each fitted in a rotatable manner about each of the trunnion journals through intermediation of a plurality of needle rollers, in which a corner portion is formed at a root portion of the each of the trunnion journals so as to restrict movement of each of the plurality of needle rollers in the axial direction toward the root portion of the each of the trunnion journals by interference between an end surface corner rounded portion of the each of the plurality of needle rollers and the corner portion at the root portion.

公开(公告)号：US20170152895A1

公开(公告)日：2017-06-01

申请号：US15319241

申请日：2015-07-06

Applicant: NTN CORPORATION

Inventor： Tatsuro SUGIYAMA

IPC: F16D3/205 ,  F16C23/08 ,  F16D1/06

CPC classification number: F16D3/2055 ,  F16C23/082 ,  F16C2361/41 ,  F16D1/06 ,  F16D2003/2026 ,  Y10S464/905

Abstract: In a tripod type constant velocity universal joint 1, when D1 represents a large inner diameter being a diameter of a circle connecting radially outer end portions of roller guide surfaces 7 and D2 represents a small inner diameter being a diameter of a circle connecting radially inner end portions of the roller guide surfaces 7, a ratio D2/D1 between the small inner diameter D2 and the large inner diameter D1 is set within a range of from 0.73 to 0.80. Further, when d represents a large diameter of a spline formed in a trunnion hub 8 of a tripod member 3 and PCD represents a pitch circle diameter of the roller guide surfaces 7, a ratio d/PCD between the large diameter d and the pitch circle diameter PCD is set to 0.60 or more.

公开(公告)号：US20240426348A1

公开(公告)日：2024-12-26

申请号：US18684345

申请日：2022-08-05

Applicant: NTN CORPORATION

Inventor： Masazumi KOBAYASHI ,  Tatsuro SUGIYAMA

IPC: F16D3/2245 ,  F16D3/223

Abstract: A plunging type constant velocity universal joint includes an outer joint member having a plurality of linear track grooves, an inner joint member having a plurality of linear track grooves, a plurality of torque transmission balls, and a cage configured to accommodate the torque transmission balls in pockets. A curvature center of a spherical outer peripheral surface and a curvature center of a spherical inner peripheral surface of the cage are offset toward opposite sides in an axial direction with respect to a joint center. A spherical clearance that allows guide in contact is formed between a spherical outer peripheral surface of the inner joint member and a spherical inner peripheral surface of the cage. A positive axial clearance is formed between the pocket of the cage and the torque transmission ball.

公开(公告)号：US20240167518A1

公开(公告)日：2024-05-23

申请号：US18282332

申请日：2022-03-11

Applicant: NTN CORPORATION

Inventor： Taku ITAGAKI ,  Shota KAWATA ,  Tatsuro SUGIYAMA

IPC: F16D3/205

CPC classification number: F16D3/2055 ,  F16D2200/0021 ,  F16D2250/0053

Abstract: In a tripod type constant velocity universal joint 1 of a double roller type, R/PCD≥0.0850 and t/PCD≥0.145, where PCD is a pitch circle diameter of a roller guide surface 6 of an outer joint member 2. R is a radius of curvature at an intermediate portion between a body portion 31 and a leg shaft 32 of a tripod member 3, and t is a minimum distance from a large-diameter portion 34a of a spline 34 of the tripod member 3 to an intermediate portion 33.

公开(公告)号：US20190101168A1

公开(公告)日：2019-04-04

申请号：US16099514

申请日：2017-04-19

Applicant: NTN CORPORATION

Inventor： Tatsuro SUGIYAMA ,  Kazuhiro AZUMA ,  Ritsuki SAKIHARA

IPC: F16D3/227

Abstract: A plunging type constant velocity universal joint includes outer and inner joint members that transmit torque therebetween through intermediation of a ball while allowing angular displacement. The outer joint member is configured to receive an internal component comprising the ball and the inner joint member so that the internal component is slidable in an axial direction. The universal joint also includes a stopper mechanism that has an annular groove, and is configured to restrict axial displacement of the internal component by allowing the ball to interfere with a circlip fitted to the annular groove. The annular groove has a conical surface, which is inclined with respect to an axial direction so that the conical surface and an axial tangent line at a contact point between the ball and the circlip form a wedge angle opened from an opening end portion of the outer joint member toward a far side.

公开(公告)号：US20180200782A1

公开(公告)日：2018-07-19

申请号：US15743827

申请日：2016-06-20

Applicant: NTN CORPORATION ,  ENOMOTO MACHINE CO., LTD.

Inventor： Yoshiya MANO ,  Shintaro SUZUKI ,  Shunichirou TSUBOI ,  Akira NAGATAKE ,  Renji NATSUME ,  Masazumi KOBAYASHI ,  Tatsuro SUGIYAMA ,  Yoshio ENOMOTO

IPC: B21K1/06 ,  B21J5/08 ,  B21J13/02 ,  B21K1/14

CPC classification number: B21K1/06 ,  B21J5/08 ,  B21J13/02 ,  B21J13/03 ,  B21K1/14 ,  B21K1/765 ,  F16D1/027 ,  F16D3/227 ,  F16D2003/22326

Abstract: A forging method for a shaft member includes preforming at least one of a plurality of enlarged diameter portions to obtain a semi-finished member, and forming a remainder of the enlarged diameter portions in the semi-finished member using a mold. The mold includes a punch, split dies, and a workpiece receiving member. The forming of the remainder of the enlarged diameter portions includes allowing the semi-finished member having the at least one of the enlarged diameter portions to be placed on the workpiece receiving member, cramping the semi-finished member in its radial direction by closing the split dies, and filling the semi-finished member into forming surfaces of the split dies by the pressure applied by the punch under the state in which the semi-finished member is cramped.

公开(公告)号：US20170120369A1

公开(公告)日：2017-05-04

申请号：US15319097

申请日：2015-05-20

Applicant: NTN CORPORATION

Inventor： Naoki NAKAGAWA ,  Shintaro SUZUKI ,  Kenichi NAKANO ,  Takuya FUJITA ,  Kiyohiro SUZUKI ,  Renji NATSUME ,  Tatsuro SUGIYAMA ,  Masazumi KOBAYASHI

IPC: B23K15/00 ,  F16D3/223 ,  F16D3/205 ,  B23K26/21

CPC classification number: B23K15/0046 ,  B23K15/04 ,  B23K26/0823 ,  B23K26/21 ,  B23K26/282 ,  B23K33/006 ,  B23K2101/04 ,  B23K2103/04 ,  B23K2103/18 ,  F16D1/027 ,  F16D3/205 ,  F16D3/2055 ,  F16D3/223 ,  F16D3/227 ,  F16D2003/22326 ,  G01N29/043 ,  G01N29/225 ,  G01N29/28 ,  G01N2291/267

Abstract: For butt-welding, which includes bringing joining end surfaces of a cup member and a shaft member into abutment against each other and radiating a high energy intensity beam from a radially outer side, the shaft member has a recess on a radially inner side of the joining end surface to obtain a welded portion having a closed hollow cavity on a radially inner side after butt-welding. The joining end surface (protruding surface) of the cup member protrudes toward a radially inner side with respect to an inner diameter of the joining end surface of the shaft member. With this, a welded portion of an outer joint member of a constant velocity universal joint, which is manufactured by joining the cup member and the shaft member, can be improved in strength and quality.