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：US20240352977A1

公开(公告)日：2024-10-24

申请号：US18685716

申请日：2022-08-10

Applicant: NTN CORPORATION

Inventor： Taku ITAGAKI

IPC: F16D3/205

CPC classification number: F16D3/2055

Abstract: In a tripod type constant velocity universal joint 1 of a double roller type, a carbon content in a core portion of a tripod member 3 is set to 0.23 to 0.44%, and a hardened layer 16 of a carburized layer is provided on the surface of a leg shaft 32. A first region P having a radius of curvature Ra in a cross section in a direction orthogonal to a joint axial direction including an axial line of the leg shaft 32 and a second region Q having a radius of curvature Rb in a cross section in the joint axial direction including the axial line of the leg shaft 32 are provided in an intermediate portion 33 provided between a body portion 31 of the tripod member 3 and the leg shaft 32. Ra>Rb is set.

公开(公告)号：US20170335883A1

公开(公告)日：2017-11-23

申请号：US15520912

申请日：2015-11-02

Applicant: NTN CORPORATION

Inventor： Taku ITAGAKI ,  Yuichi ASANO ,  Tomoshige KOBAYASHI ,  Takeyoshi KONOMOTO ,  Minoru ISHIJIMA

IPC: F16C3/02

CPC classification number: F16C3/02 ,  F16C3/026 ,  F16C2204/00 ,  F16C2208/02 ,  Y10T403/7045

Abstract: A corrugated portion is formed in one end edge portion of the metallic shaft main body (2), and a triangular corrugated portion (11) is formed in an end edge portion of the shaft auxiliary body (3) on the metallic shaft main body side. The metallic shaft main body (2) and the shaft auxiliary body (3) are integrated by being linearly arranged by way of meshing that brings a side of the triangular corrugated portion (9) on the main body side and a side of the triangular corrugated portion (11) on the auxiliary body side into contact with each other. A fiber orientation angle (θ) of the fiber reinforced plastic of the shaft auxiliary body (3) is set so as to be in the same direction as a direction of stress generated in a hypotenuse of each triangular portion under a torque load state.

公开(公告)号：US20230204078A1

公开(公告)日：2023-06-29

申请号：US17927119

申请日：2021-05-13

Applicant: NTN Corporation

Inventor： Taku ITAGAKI ,  Tatsuro SUGIYAMA ,  Minoru ISHIJIMA

IPC: F16D3/205 ,  F16C19/26 ,  F16C35/04 ,  F16C33/58

CPC classification number: F16D3/205 ,  F16C19/26 ,  F16C35/042 ,  F16C33/58

Abstract: A tripod type constant velocity universal joint includes an outer joint member having three track grooves each including roller guide surfaces opposing each other in a circumferential direction of each of the track grooves, a tripod member including three leg shafts, and roller units each including a roller and an inner ring to support the roller. An outer peripheral surface of the roller has a partially spherical surface having a curvature center on an axis of each of the leg shafts. The roller guide surfaces are each formed of a partially cylindrical surface having a curvature center on a horizontal line passing an intersection of a pitch circle of the track grooves and a center line of each of the track grooves, and when no torque is applied to the joint, an end portion of the outer peripheral surface of the roller abuts against the roller guide surfaces.

公开(公告)号：US20220090635A1

公开(公告)日：2022-03-24

申请号：US17414436

申请日：2019-12-20

Applicant: NTN Corporation

Inventor： Taku ITAGAKI ,  Tatsuro SUGIYAMA ,  Shouta KAWATA

IPC: F16D3/205

Abstract: A tripod type constant velocity universal joint includes an outer joint member that includes track grooves, a tripod member that includes three leg shafts protruding in a radial direction, a roller that is inserted into the track groove, and an inner ring that is fitted onto the leg shaft, and rotatably supports the roller. A hardened layer is formed on a surface of each leg shaft by carburizing, hardening, and tempering. The tripod member is formed a steel material having a carbon content of 0.23% to 0.44%. An effective hardened layer depth of the hardened layer by using, as a Ts torque, 0.3 times a minimum static torsional torque at which a shaft coupled to the tripod member causes torsional fracture and 600HV as limit hardness is equal to or greater than a maximum shear stress depth Z when the Ts torque is applied.

公开(公告)号：US20200318676A1

公开(公告)日：2020-10-08

申请号：US16956794

申请日：2018-12-21

Applicant: NTN CORPORATION

Inventor： Taku ITAGAKI ,  Minoru ISHIJIMA

IPC: F16C3/02 ,  F16D1/02

Abstract: Provided is a power transmission shaft, including: a metal shaft member; and a resin shaft member connected to the metal shaft member in an axial direction of the power transmission shaft. The resin shaft member is made of fiber reinforced plastic. The metal shaft member and the resin shaft member are joined to each other through a close-contact fitting portion between a male spline, which is formed in an outer surface of the metal shaft member, and a female spline formed by press-fitting the male spline into the resin shaft member. An edge is formed at a radially outer edge portion of a press-fitting-start end surface of the male spline of the metal shaft member.

公开(公告)号：US20160290450A1

公开(公告)日：2016-10-06

申请号：US15038305

申请日：2014-11-20

Applicant: NTN CORPORATION

Inventor： Taku ITAGAKI ,  Yoshiaki RYOUNO ,  Kazuya AKAISHI

IPC: F16H9/18 ,  F16H61/662

CPC classification number: F16H9/18 ,  F16H61/662 ,  F16H63/062

Abstract: A V-belt type infinitely variable transmission is provided which is made up of a smaller number of parts and which can be easily assembled and disassembled. By rotating an eccentric cam, an arm member is moved in the axial direction of a primary shaft. When the arm member is moved in this direction, a movable pulley member of a driving pulley is moved relative to a fixed pulley member of the driving pulley. Thus, it is possible to adjust the groove width of the driving pulley.

Abstract translation: 提供了一种V形带式无级变速器，它由较少数量的部件组成，可以方便地组装和拆卸。 通过旋转偏心凸轮，臂构件沿主轴的轴向移动。 当臂构件沿该方向移动时，驱动滑轮的可动皮带轮构件相对于驱动滑轮的固定滑轮构件移动。 因此，可以调节驱动滑轮的槽宽度。