JPH115138A - Making of rack bar - Google Patents
Making of rack barInfo
- Publication number
- JPH115138A JPH115138A JP15894597A JP15894597A JPH115138A JP H115138 A JPH115138 A JP H115138A JP 15894597 A JP15894597 A JP 15894597A JP 15894597 A JP15894597 A JP 15894597A JP H115138 A JPH115138 A JP H115138A
- Authority
- JP
- Japan
- Prior art keywords
- pipe material
- flat surface
- longitudinal direction
- thickness
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Gears, Cams (AREA)
- Forging (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車のステアリ
ング機構等に使用されるラックバーおよびその製造方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rack bar used for a steering mechanism and the like of an automobile and a method of manufacturing the same.
【０００２】[0002]
【従来の技術】例えば自動車のステアリング機構とし
て、ステアリングシャフトに固着されるピニオンと、前
輪操向側のラックとを噛合させ、ステアリングシャフト
の回転により前輪を操向させるようにしたラック・ピニ
オン方式がある。2. Description of the Related Art As a steering mechanism of an automobile, for example, a rack and pinion system in which a pinion fixed to a steering shaft and a rack on a front wheel steering side are engaged with each other so that the front wheels are steered by rotation of the steering shaft. is there.
【０００３】しかしてこの種の機構に用いられるラック
は、金属丸棒材の一面を切削してラック歯を形成してい
たが、このようにして造るラックバーは多くの工数が掛
り、かつ重量が大でコストが嵩むという問題があったこ
とから、近時パイプ材からラックバーを形成する技術が
例えば特公平３ー５８９２号公報に開示されている。ま
た本件出願人の出願である特開平６ー２４６３７９号公
報に記載された技術には、パイプ材を製造用型内に納
め、その型の長手方向に開口する開口部分からパイプ材
の上面を加熱して軟化させ、ついで前記開口部からプレ
ス型により平坦面に加工したのちパイプ材を取出し、内
面に製造用歯列を有する歯型製造用型に入れ、パイプ材
内に芯金を圧入して前記平坦面を歯形内に圧入して歯列
を形成する方法が開示されている。[0003] The rack used in this type of mechanism has a rack tooth formed by cutting one surface of a metal round bar. However, the rack bar manufactured in this manner requires many man-hours and is heavy. However, there has been a problem that the size of the rack bar is large and the cost is high. Therefore, a technique for forming a rack bar from a pipe material has recently been disclosed in, for example, Japanese Patent Publication No. 3-5892. Further, the technique described in Japanese Patent Application Laid-Open No. Hei 6-246379, which is an application of the present applicant, includes placing a pipe material in a manufacturing mold and heating the upper surface of the pipe material from an opening portion opened in the longitudinal direction of the mold. After softening, and then processed into a flat surface by a press die from the opening, take out the pipe material, put it into a tooth mold manufacturing die having manufacturing teeth on the inner surface, and press-fit a metal core into the pipe material. A method for forming a tooth row by pressing the flat surface into a tooth profile is disclosed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら上記従来
の技術では、丸パイプを平型によりその周面の一部を平
坦状に加圧して平坦面を形成し、その平坦面に歯型を内
側から押出して製造するので、初回の平坦加工時に肉が
両側へ圧縮されて平坦面の肉厚が確保し難く、歯型製造
時に内側から歯型製造用の歯型列に圧入させる際に歯型
に十分に充満せず、予定の歯の形状が得にくいうえ、歯
底部分の素材の肉厚が薄くなってしまうという問題があ
った。However, in the above prior art, a part of the peripheral surface of a round pipe is flatly pressed by a flat mold to form a flat surface, and a tooth mold is formed on the flat surface from the inside. Since it is manufactured by extrusion, the meat is compressed to both sides during the first flattening process, making it difficult to secure the thickness of the flat surface. There is a problem that it is not sufficiently filled, it is difficult to obtain a desired tooth shape, and the thickness of the material at the bottom of the tooth becomes thin.
【０００５】このことは丸パイプを平型によりその周面
の一部を平坦状に加圧して平坦面を形成し、その平坦面
に歯型を外側からブローチ加工により形成する場合も同
じで、丸パイプの肉厚が薄いと十分な歯高が取れず、そ
こで十分な歯高を取るために肉厚の厚いパイプを使用す
ると丸棒材の場合と同様に重量が大となり、コストが嵩
むという問題は避け得られなかった。[0005] The same applies to the case where a round pipe is flatly pressed to form a flat surface on a part of its peripheral surface by a flat mold, and a tooth mold is formed on the flat surface by broaching from the outside. It is said that if the thickness of the round pipe is thin, sufficient tooth height cannot be obtained, and if a thick pipe is used in order to obtain a sufficient tooth height, the weight increases as in the case of the round bar, and the cost increases. The problem was inevitable.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記の問題点
を解決するため、厚肉のパイプを素材としたラックバー
およびその製造方法を提供することを課題としてなされ
たもので、その解決手段としては歯形部分は厚肉に、そ
して他の部分を薄肉に形成するようにしたことにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a rack bar made of a thick pipe and a method of manufacturing the same. The measure is to make the tooth profile thicker and the other parts thinner.
【０００７】すなわち請求項１記載の発明は、厚肉パイ
プ材の長手方向所要範囲の周面部分をプレス加工により
平担面に成形する第１工程と、該平担面をなす肉部に長
手方向に直角に複数列の歯形を加工する第２工程と、前
記パイプ材の長手方向の他の部分の外径をしごき加工に
より前記平担面の肉厚よりも薄肉となるように小径に成
形する第３工程とを有することを特徴とする。That is, the first aspect of the present invention provides a first step of forming a peripheral portion of a thick pipe material in a required range in the longitudinal direction into a flat surface by press working, and forming a longitudinal portion on the flat portion forming the flat portion. A second step of processing a plurality of rows of tooth profiles perpendicular to the direction, and ironing the outer diameter of the other portion of the pipe material in the longitudinal direction to a small diameter so as to be thinner than the thickness of the flat surface. And a third step of performing the following.
【０００８】また、請求項２記載の発明は歯形加工と小
径化加工との順番を逆にしたもので、厚肉パイプ材の長
手方向所要範囲の周面部分をプレス加工により平担面に
成形する第１工程と、該パイプ材の長手方向の他の部分
の外径をしごき加工により前記平担面の肉厚よりも薄肉
となるように小径に成形する第２工程と、前記平担面を
なす肉部に長手方向に直角に複数列の歯形を加工する第
３工程とを有することを特徴とする。The invention according to claim 2 is the one in which the order of the tooth profile processing and the diameter reduction processing is reversed, and the peripheral portion of the thick pipe material in a required range in the longitudinal direction is formed into a flat surface by pressing. A second step of forming the outer diameter of another portion of the pipe member in the longitudinal direction to a small diameter by ironing so as to be thinner than the thickness of the flat surface; And a third step of machining a plurality of rows of tooth profiles at right angles to the longitudinal direction on the flesh portion forming the shape.
【０００９】さらに請求項３は請求項１または２項記載
の発明において、前記歯形加工をブローチ加工としたこ
とを特徴とする。A third aspect of the present invention is characterized in that, in the invention of the first or second aspect, the tooth profile processing is broaching.
【００１０】そして請求項４記載の発明は、パイプ材の
長手方向所要範囲に形成された平坦面に、該パイプ材の
長手方向に直角な複数列の歯形が形成され、前記パイプ
材の他の範囲は前記平担面の肉部よりも薄肉に形成され
ているラックバーとしたことにある。According to a fourth aspect of the present invention, a plurality of rows of tooth profiles perpendicular to the longitudinal direction of the pipe material are formed on a flat surface formed in a required range in the longitudinal direction of the pipe material, The range is that the rack bar is formed to be thinner than the wall portion of the flat bearing surface.
【００１１】[0011]
【発明の実施の形態】以下、本発明を図面に示す実施の
形態を参照して説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.
【００１２】図１乃至図８は請求項１記載の発明にかか
るラックバーの製造方法を示すもので、図１はラックバ
ーを製造するパイプ素材１の外観斜視図である。FIGS. 1 to 8 show a method of manufacturing a rack bar according to the first aspect of the present invention. FIG. 1 is an external perspective view of a pipe material 1 for manufacturing a rack bar.
【００１３】パイプ素材１は適宜長さのＳＴＫＭ１５〜
１６のカーボン含有量の大きい鋼管が用いられ、例えば
外径３０φｍｍ、肉厚４〜６ｍｍ（通常前記外径の場合
２〜３ｍｍ）のものを使用する。The pipe material 1 is made of STKM15-
A steel pipe having a large carbon content of 16 is used. For example, a steel pipe having an outer diameter of 30 mm and a wall thickness of 4 to 6 mm (usually 2 to 3 mm in the case of the outer diameter) is used.
【００１４】図２は図１のパイプ素材１の長手方向の一
側上面部分の所要長さ範囲にプレス加工により平担面２
を成形する状態を順次示すもので、図２（Ａ）はパイプ
素材１の加工される上面以外の外周面の左右を２つ割り
の保持型２ａ，２ｂにより押え、パイプ素材１の上部か
ら加工される平担面に対応する長さを有し、かつ直交す
る下面が略山形状に凹陥して凹型面３ａを有する第１の
プレス型３により加圧して、まずパイプ素材１の上部に
断面山形状の凸部１ａを図２（Ｂ）のように成形し、つ
ぎに凸部１ａを加熱したのち下面が平坦な第２のプレス
型４により山形状の凸部１ａを押圧することにより図２
（Ｃ）および図３のように平担面１ｂが形成される。FIG. 2 shows a flat surface 2 of the pipe blank 1 shown in FIG.
FIG. 2 (A) shows a state in which the left and right sides of the outer peripheral surface other than the upper surface of the pipe blank 1 to be machined are pressed by two holding dies 2a and 2b, and the pipe blank 1 is machined from above. The first press die 3 having a length corresponding to the flat surface to be formed and having a concave surface 3a in which the lower surface perpendicular to the concave surface is depressed in a substantially mountain shape, is first pressed into a cross section at the upper part of the pipe blank 1. The convex portion 1a having a mountain shape is formed as shown in FIG. 2B, the convex portion 1a is heated, and then the convex portion 1a having the mountain shape is pressed by a second press die 4 having a flat lower surface. 2
A flat surface 1b is formed as shown in FIG.
【００１５】なお図２の実施形態では平坦面２の成形を
第１のプレス型３と第２のプレス型４とにより順次加工
する場合について説明したが、１つのプレス型により一
挙に形成するようにしてもよい。In the embodiment of FIG. 2, the case where the flat surface 2 is formed sequentially by the first press die 3 and the second press die 4 has been described. However, the flat surface 2 is formed by one press die at a time. It may be.
【００１６】図４は図３の平担面１ｂにブローチ加工に
より複数列の歯形を成形するようにしたもので、このブ
ローチ５は２点鎖線で示すように複数列で歯形が手前側
から奥側にかけて順次歯の高さが５ａ，５ｂ．５ｃ，…
と低い状態から高い状態に設けられたものが使用され
る。FIG. 4 shows a configuration in which a plurality of rows of teeth are formed on the flat surface 1b of FIG. 3 by broaching. This broach 5 has a plurality of rows of teeth as shown by a two-dot chain line. The height of the teeth is 5a, 5b. 5c, ...
The one provided from a low state to a high state is used.
【００１７】したがって図示のようにパイプ素材１の長
手方向に直角にブローチ５を矢印のように下降させて平
担面１ｂに接触させながら前後（矢印）方向に移動させ
てラックの歯形６を加工する。これにより図５に示すよ
うな歯形６が形成される。Accordingly, as shown in the figure, the broach 5 is lowered as shown by the arrow at right angles to the longitudinal direction of the pipe blank 1, and moved in the front-rear (arrow) direction while making contact with the flat surface 1b to process the tooth profile 6 of the rack. I do. Thereby, the tooth profile 6 as shown in FIG. 5 is formed.
【００１８】図６はパイプ素材１の長手方向の他の部分
をしごき加工により薄肉化する工程の一例を示すもの
で、パイプ素材１の歯形６とは反対側となる端部から、
その内径に近似した外径を有する芯金７を歯形６に近接
した位置まで挿入するとともに、歯形６に近接したパイ
プ素材１の外周側にはくびれ部１ｃをしごき前に加工し
た後、パイプ素材１の外周に取付けたダイス８を矢印方
向に移動させてしごき、パイプ素材１の肉厚を減少させ
る。図中、８ａは刃である。この場合肉厚はパイプ素材
１の１／２程度までしごきを行うのでパイプ素材１の長
さもその分延伸されることになる。FIG. 6 shows an example of a step of thinning the other portion of the pipe material 1 in the longitudinal direction by ironing. From the end of the pipe material 1 on the opposite side to the tooth profile 6,
After inserting a metal core 7 having an outer diameter close to the inner diameter up to a position close to the tooth form 6, a constriction 1 c is formed on the outer peripheral side of the pipe material 1 close to the tooth form 6 before ironing. The die 8 attached to the outer periphery of the pipe material 1 is moved in the direction of the arrow to squeeze it, thereby reducing the thickness of the pipe blank 1. In the figure, 8a is a blade. In this case, the thickness of the pipe blank 1 is reduced to about 1/2 of that of the pipe blank 1, so that the length of the pipe blank 1 is extended accordingly.
【００１９】図７は図６のしごき加工により完成品とな
ったたラックバー１Ａの外観斜視を示すもので、この場
合、歯形６側の端部はしごかれていないが、必要に応じ
この部分もしごき加工することがある。FIG. 7 is a perspective view showing the appearance of the rack bar 1A which has been completed by the ironing process shown in FIG. 6. In this case, the end of the tooth profile 6 is not ironed, but this part may be omitted if necessary. May be ironed.
【００２０】図８は図７の長手方向の断面図を示すもの
で、平坦面１ｂ側の肉厚をｔ1 とし、しごかれた側の肉
厚をｔ2 とした場合、２ｔ2 ＝ｔ1 となるようにするこ
とが望ましい。FIG. 8 is a longitudinal sectional view of FIG. 7, where t 1 is the thickness on the flat surface 1b side and t 2 is the thickness on the squeezed side, and 2t 2 = t It is desirable to set it to 1 .
【００２１】請求項２記載の発明にかかるラックバーの
製造方法は請求項１記載の発明の第２工程と第３工程と
を逆にしたもので、いずれが先であっても同じように製
造することが可能である。The method of manufacturing a rack bar according to the second aspect of the present invention is obtained by reversing the second and third steps of the first aspect of the invention. It is possible to
【００２２】[0022]
【発明の効果】以上説明したように本発明によれば、同
一パイプ素材から製造されるラックバーは歯列成形部分
の肉の引けがなく、ラックの歯形部分が厚肉で、ラック
以外の部分は薄肉に成形できるとともに加工硬化により
強度が増し、これにより十分な歯高が得られても軽量で
かつ強度も丸棒材からの製造の場合と比較して劣ること
がなく、したがって軽量なラックバー安価に提供するこ
とができる。As described above, according to the present invention, a rack bar manufactured from the same pipe material does not suffer from the shrinkage of the teeth forming portion, the tooth profile portion of the rack is thick, and portions other than the rack are formed. Can be molded into a thin wall and the strength is increased by work hardening, so that even if a sufficient tooth height is obtained, the weight is light and the strength is not inferior to the case of manufacturing from a round bar material, and therefore, a light weight rack Bars can be provided cheaply.
【図１】本発明にかかるラックバーを得るためのパイプ
素材の外観斜視図。FIG. 1 is an external perspective view of a pipe material for obtaining a rack bar according to the present invention.
【図２】図１のパイプ素材に平坦面が成形される過程を
示し、（Ａ）は加工前、（Ｂ）は加工中、（Ｃ）は加工
後の状態の各断面図。FIGS. 2A and 2B are cross-sectional views showing a process of forming a flat surface on the pipe material of FIG. 1, wherein FIG. 2A is a state before processing, FIG. 2B is a state during processing, and FIG.
【図３】図１のパイプ素材に平坦面が成形された状態を
示す外観斜視図。FIG. 3 is an external perspective view showing a state where a flat surface is formed on the pipe material of FIG. 1;
【図４】図３の平坦面に歯形成形のためのブローチ加工
がなされる状態を示す外観斜視図。FIG. 4 is an external perspective view showing a state in which broaching for forming teeth is performed on the flat surface of FIG. 3;
【図５】図４の歯形成形によりラックの歯形が成形され
た外観斜視図。FIG. 5 is an external perspective view in which a tooth profile of a rack is formed by the tooth forming profile of FIG. 4;
【図６】図５のラックのない長手方向の他側にしごき加
工される状態を示す外観斜視図。6 is an external perspective view showing a state where ironing is performed on the other side in the longitudinal direction without the rack in FIG. 5;
【図７】図６のしごき加工により本発明のラックバーが
完成した状態を示す外観斜視図。7 is an external perspective view showing a state where the rack bar of the present invention is completed by the ironing process of FIG. 6;
【図８】図７の長手方向の断面図。8 is a longitudinal sectional view of FIG. 7;
１ パイプ素材 １Ａ ラックバー １ｂ 平坦面 ２ａ，２ｂ 型 ３ 第１のプレス ４ 第２のプレス ５ ブローチ ６ ラック ７ 芯金 ８ ダイス Reference Signs List 1 pipe material 1A rack bar 1b flat surface 2a, 2b mold 3 first press 4 second press 5 broach 6 rack 7 cored bar 8 die
Claims (4)
分をプレス加工により平担面に成形する第１工程と、該
平担面をなす肉部に長手方向に直角に複数列の歯形を加
工する第２工程と、前記パイプ材の長手方向の他の部分
の外径をしごき加工により前記平担面の肉厚よりも薄肉
となるように小径に成形する第３工程とを有することを
特徴とするラックバーの製造方法。1. A first step of forming a peripheral portion of a thick pipe material in a required range in a longitudinal direction into a flat surface by press working, and forming a plurality of rows at right angles in a longitudinal direction to a wall portion forming the flat surface. A second step of processing the tooth profile; and a third step of forming the outer diameter of the other portion of the pipe material in the longitudinal direction to a smaller diameter by ironing so as to be thinner than the thickness of the flat surface. A method for manufacturing a rack bar.
分をプレス加工により平担面に成形する第１工程と、該
パイプ材の長手方向の他の部分の外径をしごき加工によ
り前記平担面の肉厚よりも薄肉となるように小径に成形
する第２工程と、前記平担面をなす肉部に長手方向に直
角に複数列の歯形を加工する第３工程とを有することを
特徴とするラックバーの製造方法。2. A first step of forming a peripheral portion of a thick pipe material in a required range in the longitudinal direction into a flat surface by press working, and ironing the outer diameter of another portion of the pipe material in the longitudinal direction by pressing. A second step of forming a small diameter so as to be thinner than the thickness of the flat surface, and a third step of processing a plurality of rows of tooth profiles at right angles to a longitudinal direction in the wall portion forming the flat surface. A method for manufacturing a rack bar.
１または２項記載のラックバーの製造方法。3. The rack bar manufacturing method according to claim 1, wherein the tooth profile processing is broaching.
平坦面に、該パイプ材の長手方向に直角な複数列の歯形
が形成され、前記パイプ材の他の範囲は前記平担面の肉
部よりも薄肉に形成されていることを特徴とするラック
バー。4. A plurality of rows of tooth profiles perpendicular to the longitudinal direction of the pipe material are formed on a flat surface formed in a required range in the longitudinal direction of the pipe material, and the other range of the pipe material is defined by the flat surface. A rack bar characterized by being formed thinner than a meat portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15894597A JPH115138A (en) | 1997-06-16 | 1997-06-16 | Making of rack bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15894597A JPH115138A (en) | 1997-06-16 | 1997-06-16 | Making of rack bar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH115138A true JPH115138A (en) | 1999-01-12 |
Family
ID=15682773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15894597A Pending JPH115138A (en) | 1997-06-16 | 1997-06-16 | Making of rack bar |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH115138A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6502473B1 (en) | 1999-10-01 | 2003-01-07 | Toyota Jidosha Kabushiki Kaisha | Rack bar and manufacturing method thereof |
| EP1839772A1 (en) * | 2006-03-30 | 2007-10-03 | Matsuoka, Minako | Method and apparatus for plastic working of hollow rack bar and hollow rack bar |
| KR100799935B1 (en) * | 2006-11-27 | 2008-01-31 | 주식회사 코우 | Rack forming method of rack bar |
| JP2016030271A (en) * | 2014-07-28 | 2016-03-07 | 高周波熱錬株式会社 | Hollow rack bar, and hollow rack bar manufacturing method |
-
1997
- 1997-06-16 JP JP15894597A patent/JPH115138A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6502473B1 (en) | 1999-10-01 | 2003-01-07 | Toyota Jidosha Kabushiki Kaisha | Rack bar and manufacturing method thereof |
| EP1839772A1 (en) * | 2006-03-30 | 2007-10-03 | Matsuoka, Minako | Method and apparatus for plastic working of hollow rack bar and hollow rack bar |
| KR100799935B1 (en) * | 2006-11-27 | 2008-01-31 | 주식회사 코우 | Rack forming method of rack bar |
| JP2016030271A (en) * | 2014-07-28 | 2016-03-07 | 高周波熱錬株式会社 | Hollow rack bar, and hollow rack bar manufacturing method |
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