公开(公告)号：US20030213321A1

公开(公告)日：2003-11-20

申请号：US10459749

申请日：2003-06-12

Applicant: NSK Ltd.

Inventor： Akira Tsubouchi ,  Kiyoshi Okubo ,  Yasushi Watanabe

IPC: F16H001/04

CPC classification number: F16H55/26 ,  B21K1/767 ,  B21K1/768 ,  B62D3/126 ,  Y10T74/1967

Abstract: The object of the invention is to provide a rack shaft having two rack teeth groups and hollowed throughout the whole body, to lightweightize the shaft and to reduce the cost. The two rack teeth groups are located longitudinally apart from each other and have phase difference related to an angle around the axis of the shaft. After the two rack teeth groups are formed simultaneously or sequentially by die forming on the flat bottoms of the workpiece beforehand gutter-shaped, the legs of the gutter-shaped workpiece are bent to butt to each other and, thereby, a tubular body of the shaft is given to the workpiece. The centers of the material are offset beforehand corresponding to the phase difference.

公开(公告)号：US20020026845A1

公开(公告)日：2002-03-07

申请号：US09832449

申请日：2001-04-10

Applicant: NSK Ltd.

Inventor： Akira Tsubouchi ,  Kiyoshi Okubo ,  Yasushi Watanabe

IPC: F16H055/08 ,  F16H055/10

CPC classification number: F16H55/26 ,  B21K1/767 ,  B21K1/768 ,  B62D3/126 ,  Y10T74/1967 ,  Y10T74/19949

Abstract: A hollow rack shaft is produced by forming a plate work piece and has continuous metal flow along the contour of rack teeth surface without being cut. A series of wave-like concave-convex sections is formed on the inner surface of the shaft. Thickness of tooth body and tooth bottom of the rack teeth is adjusted by dimensions of the unevenness. Thereby, stress concentration at each point of the rack shaft is prevented and the shaft is strengthend and lightweightized.

Abstract translation: 通过形成板状工件制造中空的齿条轴，并且沿着齿条齿表面的轮廓连续地进行金属流动而不被切割。 在轴的内表面上形成有一系列波状的凹凸部。 牙齿的齿体和齿底的厚度根据不平整度的尺寸进行调节。 由此，防止齿条轴的各点处的应力集中，并且轴被加强和轻量化。

公开(公告)号：US20040170401A1

公开(公告)日：2004-09-02

申请号：US10798175

申请日：2004-03-11

Applicant: NSK LTD.

Inventor： Akira Tsubouchi ,  Kiyoshi Okubo ,  Yasushi Watanabe

IPC: H04N005/781 ,  B21D022/00 ,  B21D022/21

CPC classification number: B21K1/767 ,  B21C37/155 ,  B21K1/063 ,  B62D3/126 ,  Y10S72/702 ,  Y10T29/49467 ,  Y10T29/49474 ,  Y10T29/49476 ,  Y10T74/1967 ,  Y10T74/19949

Abstract: A hollow rack shaft is manufactured through a first step, a second step and a third step. At the first step, the plate-like workpiece of substantial rectangular shape is press formed into a gutter-like shape. The first die set used at this step is provided with slant die surfaces for canceling elastic recovering generated at the workpiece when the workpiece is removed from the first die set. At the second step, a row of rack teeth is press-formed on the flat bottom portion of the workpiece formed in the first step. The die set used at the second step is provided with a recess for releasing surplus workpiece material within the die clearance at a stroke end of the pressworking. At the third step, each of a pair of legs of the workpiece is bent in a semi-circular shape so as to be butted to each other. At this time, a mandrel is inserted between the legs of the workpiece.

公开(公告)号：US20030209100A1

公开(公告)日：2003-11-13

申请号：US10461056

申请日：2003-06-13

Applicant: NSK Ltd.

Inventor： Akira Tsubouchi ,  Kiyoshi Okubo ,  Yasushi Watanabe

IPC: F16H001/04

CPC classification number: B21D43/285 ,  B21C37/155 ,  B21D35/006 ,  B21D53/88 ,  B21K1/12 ,  B21K1/767 ,  B21K1/768 ,  B62D3/126 ,  Y10T29/49462 ,  Y10T29/49467 ,  Y10T29/49474 ,  Y10T29/49906 ,  Y10T74/1967

Abstract: A workpiece for a hollow rack shaft is a substantially rectangular plate. The opposite two sides of this workpiece are respectively provided with a complementary profile composed of the continuation of a convex portion and a concave portion and when the workpiece is cylindrically formed, the profiles are mutually engaged. As the width of a part the width of which is the largest in the convex portion is larger than that of a part the width of which is the smallest in the concave portion, the two sides are prevented from being detached after engagement. Further, the opposite convex portion and concave portion are mutually caulked and hereby, mutual gap is removed.

公开(公告)号：US20010020328A1

公开(公告)日：2001-09-13

申请号：US09803560

申请日：2001-03-09

Applicant: NSK Ltd.

Inventor： Akira Tsubouchi ,  Kiyoshi Okubo ,  Yasushi Watanabe

IPC: B21D053/00

CPC classification number: B21K1/767 ,  B21C37/155 ,  B21K1/063 ,  B62D3/126 ,  Y10S72/702 ,  Y10T29/49467 ,  Y10T29/49474 ,  Y10T29/49476 ,  Y10T74/1967 ,  Y10T74/19949

Abstract: A hollow rack shaft is manufactured through a first step, a second step and a third step. At the first step, the plate-like workpiece of substantial rectangular shape is press formed into a gutter-like shape. The first die set used at this step is provided with slant die surfaces for canceling elastic recovering generated at the workpiece when the workpiece is removed from the first die set. At the second step, a row of rack teeth is press-formed on the flat bottom portion of the workpiece formed in the first step. The die set used at the second step is provided with a recess for releasing surplus workpiece material within the die clearance at a stroke end of the pressworking. At the third step, each of a pair of legs of the workpiece is bent in a semi-circular shape so as to be butted to each other. At this time, a mandrel is inserted between the legs of the workpiece.

Abstract translation: 通过第一步骤，第二步骤和第三步骤制造空心齿条轴。 在第一步骤中，大致矩形的板状工件被压制成沟槽状。 在该步骤中使用的第一模具设置有倾斜的模具表面，用于抵消当从第一模具组移除工件时在工件处产生的弹性恢复。 在第二步骤中，在第一步骤中形成的工件的平坦底部上压制一排齿条齿。 在第二步骤中使用的模具设置有用于在冲压加工的冲程端处释放模具间隙内的多余工件材料的凹部。 在第三步骤中，工件的一对腿中的每一个被弯曲成半圆形以便彼此对接。 此时，心轴插入工件的腿部之间。

公开(公告)号：US20020073793A1

公开(公告)日：2002-06-20

申请号：US09994526

申请日：2001-11-27

Applicant: NSK LTD.

Inventor： Akira Tsubouchi ,  Kiyoshi Okubo ,  Yasushi Watanabe

IPC: B62D003/12 ,  F16H055/26

CPC classification number: F16H55/26 ,  B21K1/767 ,  B21K1/768 ,  B62D3/126 ,  Y10T74/1967

Abstract: The object of the invention is to provide a rack shaft having two rack teeth groups and hollowed throughout the whole body, to lightweightize the shaft and to reduce the cost. The two rack teeth groups are located longitudinally apart from each other and have phase difference related to an angle around the axis of the shaft. After the two rack teeth groups are formed simultaneously or sequentially by die forming on the flat bottoms of the workpiece beforehand gutter-shaped, the legs of the gutter-shaped workpiece are bent to butt to each other and, thereby, a tubular body of the shaft is given to the workpiece. The centers of the material are offset beforehand corresponding to the phase difference.

Abstract translation: 本发明的目的是提供一种齿条轴，其具有两个齿条齿组，并且在整个机体中中空化，以使轴轻量化并降低成本。 两个齿条齿组彼此纵向分开，并且具有与轴的轴线周围的角度相关的相位差。 在通过模具成形同时或顺序地形成两个齿条齿组之后，预先形成沟槽状的工件的平坦底部，将沟槽状工件的腿弯曲成彼此对接，从而将管状体 轴被给予工件。 材料的中心预先相应于相位差偏移。

公开(公告)号：US20010013241A1

公开(公告)日：2001-08-16

申请号：US09775124

申请日：2001-02-01

Applicant: NSK Ltd.

Inventor： Akira Tsubouchi ,  Kiyoshi Okubo ,  Yasushi Watanabe

IPC: B21D022/06

CPC classification number: B62D3/126 ,  B21D15/04 ,  B21K1/767 ,  B21K1/768 ,  Y10T29/49474 ,  Y10T74/19949

Abstract: According to a method of manufacturing a hollow rack shaft, an approximately rectangular plate having a wide rack tooth portion is bent lengthwise. At this time, the plate has, at the central portion, a flat bottom portion on which rack teeth are formed later and a pair of mutually facing leg portions, and, in the vicinity of both ends, a semicircular bottom portion and a pair of mutually facing leg portions. The mutually facing leg portions at the central portion are bent into a gutter-like cross section having a larger clearance than the clearance of the mutually facing leg portions in the vicinity of both ends. The rack teeth are thus formed on the flat bottom portion through the plastic flow of the flat bottom portion and apart of material of the pair of leg portions of this flat bottom portion. The plate on which the rack teeth have been formed is formed into a tube having a hollow inner surface, by bending the plate and butt-joining the edge portions.

Abstract translation: 根据制造中空齿条轴的方法，具有宽齿条齿部的近似矩形的板被纵向弯曲。 此时，板在中央部具有稍后形成齿条齿的平坦的底部和一对相互相对的脚部，并且在两端附近具有半圆底部和一对 相互面对的腿部。 中心部分的相互相对的腿部弯曲成具有比两端附近的相互面对的腿部的间隙大的间隙的沟槽状横截面。 因此，齿条齿通过平底部的塑性流动以及该平底部一对腿部的材料的分开形成在平底部上。 已经形成齿条齿的板通过弯曲板和对接边缘部分而形成具有中空内表面的管。

公开(公告)号：US20030196469A1

公开(公告)日：2003-10-23

申请号：US10315281

申请日：2002-12-09

Applicant: NSK LTD.

Inventor： Akira Tsubouchi ,  Kiyoshi Okubo ,  Yasushi Watanabe

IPC: B21D017/00

CPC classification number: B21K1/767 ,  B21C37/155 ,  B21K1/063 ,  B62D3/126 ,  Y10S72/702 ,  Y10T29/49467 ,  Y10T29/49474 ,  Y10T29/49476 ,  Y10T74/1967 ,  Y10T74/19949

Abstract: A hollow rack shaft is manufactured through a first step, a second step and a third step. At the first step, the plate-like workpiece of substantial rectangular shape is press formed into a gutter-like shape. The first die set used at this step is provided with slant die surfaces for canceling elastic recovering generated at the workpiece when the workpiece is removed from the first die set. At the second step, a row of rack teeth is press-formed on the flat bottom portion of the workpiece formed in the first step. The die set used at the second step is provided with a recess for releasing surplus workpiece material within the die clearance at a stroke end of the pressworking. At the third step, each of a pair of legs of the workpiece is bent in a semi-circular shape so as to be butted to each other. At this time, a mandrel is inserted between the legs of the workpiece.

Abstract translation: 通过第一步骤，第二步骤和第三步骤制造空心齿条轴。 在第一步骤中，大致矩形的板状工件被压制成沟槽状。 在该步骤中使用的第一模具设置有倾斜的模具表面，用于抵消当从第一模具组移除工件时在工件处产生的弹性恢复。 在第二步骤中，在第一步骤中形成的工件的平坦底部上压制一排齿条齿。 在第二步骤中使用的模具设置有用于在冲压加工的冲程端处释放模具间隙内的多余工件材料的凹部。 在第三步骤中，工件的一对腿中的每一个被弯曲成半圆形以便彼此对接。 此时，心轴插入工件的腿部之间。

公开(公告)号：US20030079517A1

公开(公告)日：2003-05-01

申请号：US10316385

申请日：2002-12-11

Applicant: NSK LTD.

Inventor： Akira Tsubouchi ,  Kiyoshi Okubo ,  Yasushi Watanabe

IPC: B21D017/00

CPC classification number: B21K1/767 ,  B21C37/155 ,  B21K1/063 ,  B62D3/126 ,  Y10S72/702 ,  Y10T29/49467 ,  Y10T29/49474 ,  Y10T29/49476 ,  Y10T74/1967 ,  Y10T74/19949

Abstract: A hollow rack shaft is manufactured through a first step, a second step and a third step. At the first step, the plate-like workpiece of substantial rectangular shape is press formed into a gutter-like shape. The first die set used at this step is provided with slant die surfaces for canceling elastic recovering generated at the workpiece when the workpiece is removed from the first die set. At the second step, a row of rack teeth is press-formed on the flat bottom portion of the workpiece formed in the first step. The die set used at the second step is provided with a recess for releasing surplus workpiece material within the die clearance at a stroke end of the pressworking. At the third step, each of a pair of legs of the workpiece is bent in a semi-circular shape so as to be butted to each other. At this time, a mandrel is inserted between the legs of the workpiece.

公开(公告)号：US20030079516A1

公开(公告)日：2003-05-01

申请号：US10315297

申请日：2002-12-09

Applicant: NSK LTD.

Inventor： Akira Tsubouchi ,  Kiyoshi Okubo ,  Yasushi Watanabe

IPC: B21D017/00

CPC classification number: B21K1/767 ,  B21C37/155 ,  B21K1/063 ,  B62D3/126 ,  Y10S72/702 ,  Y10T29/49467 ,  Y10T29/49474 ,  Y10T29/49476 ,  Y10T74/1967 ,  Y10T74/19949

Abstract: A hollow rack shaft is manufactured through a first step, a second step and a third step. At the first step, the plate-like workpiece of substantial rectangular shape is press formed into a gutter-like shape. The first die set used at this step is provided with slant die surfaces for canceling elastic recovering generated at the workpiece when the workpiece is removed from the first die set. At the second step, a row of rack teeth is press-formed on the flat bottom portion of the workpiece formed in the first step. The die set used at the second step is provided with a recess for releasing surplus workpiece material within the die clearance at a stroke end of the pressworking. At the third step, each of a pair of legs of the workpiece is bent in a semi-circular shape so as to be butted to each other. At this time, a mandrel is inserted between the legs of the workpiece.