公开(公告)号：US20190047609A1

公开(公告)日：2019-02-14

申请号：US16160139

申请日：2018-10-15

申请人： NSK LTD.

发明人： Yuuki Muzushima ,  Nobuyuki Hagiwara ,  Kazuto Kobayashi

IPC分类号： B62D3/12 ,  F16H55/26 ,  F16H19/04 ,  B21K1/76

摘要： A steering rack (11a) meshes with a pinion rotatably driven by the input shaft (6) of a steering gear (5) constituting an automotive steering device. The steering rack (11a) is provided with a an axially extending rod part (15) of round cross section, and a plurality of rack teeth (16) formed on a radial one side surface of an axial portion of the rod part (15), the rack teeth (16) meshing with the pinion. At least one dummy tooth (42) is formed in portions that are axial parts of the rod part (15) and are adjacent to both axial sides of the plurality of rack teeth (16). The dummy tooth (42) has a tooth height less than the rack teeth (16) and does not mesh with the pinion.

公开(公告)号：US09956607B2

公开(公告)日：2018-05-01

申请号：US15328773

申请日：2015-07-24

申请人： NSK LTD.

发明人： Nobuyuki Hagiwara ,  Toshio Nakamura ,  Hiroshi Koyama ,  Isao Shintou ,  Kazuto Kobayashi

IPC分类号： F16C43/04 ,  B21K1/40 ,  F16C19/18 ,  B60B27/00

CPC分类号： B21K1/40 ,  B21J9/025 ,  B60B27/001 ,  B60B27/0031 ,  B60B27/0078 ,  B60B27/0084 ,  B60B2380/14 ,  F16C19/186 ,  F16C43/04 ,  F16C2220/46 ,  F16C2226/52 ,  F16C2326/02

摘要： Construction is achieved that is capable of preventing the formation of radial streaks in the tip-end surfaces of teeth of hub-side face splines 21. When a swing center distance is taken to be L, a swing angle that is the inclination angle of the center axis of a roll 30 with respect to a main hub body 8 is taken to be θ, the pitch diameter of the hub-side face splines 21 is taken to be Dh, the number of teeth of the hub-side face splines 21 is taken to be Nh, and the number of teeth of a processing surface 31 of the roll 30 is taken to be Nr, the position relationship of the main hub body 8 and the roll 30, or in other words, at least one of the swing center distance L, the swing angle θ, and the pitch circle diameter Dh is regulated so that the relationship Nh/Nr=cos θ+(2L/Dh)·sin θ is satisfied.

公开(公告)号：US09914166B2

公开(公告)日：2018-03-13

申请号：US14770795

申请日：2014-02-06

申请人： NSK Ltd.

发明人： Nobuyuki Hagiwara ,  Yuuki Mizushima ,  Kazuto Kobayashi

IPC分类号： F16H55/26 ,  B21K1/76 ,  B62D3/12 ,  B21J13/02

CPC分类号： B21K1/767 ,  B21J13/025 ,  B62D3/12 ,  B62D3/126 ,  F16H55/26

摘要： Provided are a manufacturing method and manufacturing device that allow the depth of rack teeth to be adequately maintained across the axial direction. A stepped surface (47) is provided on one surface in the axial direction of a pressure punch (46) that moves together with a teeth-forming punch (32). The teeth-forming punch (32) is displaced downward and rack teeth are formed on the upper surface of an intermediate material (23). At the same time, the surface on the end in the axial direction of the intermediate material (23) is pressed in the axial direction by a movable die (41a) due to the engagement between the stepped surface (47) and the surface on the other side in the axial direction of the movable die (41a).