JPH11278287A - Steering rack shaft and method of manufacturing the same - Google Patents
Steering rack shaft and method of manufacturing the sameInfo
- Publication number
- JPH11278287A JPH11278287A JP8534798A JP8534798A JPH11278287A JP H11278287 A JPH11278287 A JP H11278287A JP 8534798 A JP8534798 A JP 8534798A JP 8534798 A JP8534798 A JP 8534798A JP H11278287 A JPH11278287 A JP H11278287A
- Authority
- JP
- Japan
- Prior art keywords
- rack
- rack teeth
- work
- mold
- tube
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/76—Making machine elements elements not mentioned in one of the preceding groups
- B21K1/767—Toothed racks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明はステアリングラッ
ク軸の製造方法に関し、特に細長板状のワークをＵ形に
曲げ加工した後その円弧部にラック歯を形成し、その後
に該ワークを管状に成形して管体とするようにしたもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a steering rack shaft, and more particularly to a method of bending an elongated plate-like work into a U-shape, forming rack teeth in an arc portion thereof, and then forming the work into a tubular shape. It is made into a tubular body.
【０００２】[0002]
【従来の技術】近時、自動車の燃費向上を目的として、
自動車部品の可及的な軽量化が要請されている。その一
環として、ステアリング装置におけるラック軸も、従来
の中実ロッドをブローチ加工してラック歯を形成するこ
とから、新たに中空パイプを用いてその円周面にラック
歯を形成することが行われるようになった（例えば、特
開平４−１７３４７６号、特開平４−１７３４７７号、
特開平６−１８２４７２号及び特開平６−３１３５０号
参照）。2. Description of the Related Art Recently, for the purpose of improving fuel efficiency of automobiles,
There is a demand for the lightest possible weight of automotive parts. As part of this, the rack shaft of the steering device is also formed by broaching a conventional solid rod to form rack teeth, so that a new hollow pipe is used to form rack teeth on its circumferential surface. (For example, JP-A-4-173476, JP-A-4-173377,
See JP-A-6-182472 and JP-A-6-31350.
【０００３】これらのステアリングラック軸の製造方法
は、いずれも、管体の外周面に軸方向へ所定長さのラッ
ク歯を形成することを特徴としている。このラック歯に
は、ステアリングギヤボックス内でピニオンが噛合し、
ギヤボックスは中間シャフトを介してステアリングコラ
ムに接続される。したがって、ステアリングのホイール
を回動操作すると、ステアリングギヤボックス内でピニ
オンが回転し、ラックが移動してステアリングラック軸
を左右いずれかに移動し、これにより前輪が操舵されて
自動車の操向が可能になる。[0003] All of these methods of manufacturing a steering rack shaft are characterized by forming rack teeth of a predetermined length in the axial direction on the outer peripheral surface of a tube. Pinions mesh with these rack teeth in the steering gear box,
The gearbox is connected to the steering column via an intermediate shaft. Therefore, when the steering wheel is rotated, the pinion rotates in the steering gear box, and the rack moves to move the steering rack shaft to the left or right, whereby the front wheels are steered and the vehicle can be steered. become.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、管体の
外周面にラック歯を形成することには、幾つかの問題が
ある。すなわち、管体の外周面にラック歯をラック歯型
を有する外型でプレスフォーミングしようとすれば、管
体内に内型を挿入しなければならず、さりとて管体内に
挿入できる内型には限度があり、成形後に引き抜けるこ
とを必要とするから、前記従来例のように中実丸棒を挿
入する以外に効果的な内型はあり得ない。したがって、
単に管体の肉厚部にラック歯を形成するのでは、ラック
歯を形成した部位の肉厚が薄くなるために、強度の低下
をもたらす。そのため、肉厚の大きな管体を用いると軽
量化に矛盾することとなる結果、所要肉厚の管体の円周
部を一部変形させて増肉し、その増肉部にラック歯を形
成することとし、そのために、工程数が増加してコスト
上昇を招来する。However, forming rack teeth on the outer peripheral surface of the tube has several problems. In other words, if press forming is to be performed on the outer peripheral surface of the tubular body by using an outer mold having a rack tooth form, the inner mold must be inserted into the tubular body. Since it is necessary to pull out after molding, there is no effective inner mold other than inserting a solid round bar as in the conventional example. Therefore,
If the rack teeth are simply formed in the thick portion of the tubular body, the thickness of the portion where the rack teeth are formed becomes thin, so that the strength is reduced. As a result, the use of a thick-walled pipe is inconsistent with weight reduction, and as a result, the circumference of the required-thickness pipe is partially deformed to increase the thickness, and rack teeth are formed in the thickened portion. Therefore, the number of steps is increased, which leads to an increase in cost.
【０００５】そこで、この発明は、工程数を減少してコ
スト低下をもたらす、管状で軽量なステアリングラック
軸及びその製造方法を提供する。Accordingly, the present invention provides a tubular and lightweight steering rack shaft and a method for manufacturing the same, which reduce the number of steps and reduce the cost.
【０００６】[0006]
【課題を解決するための手段】この発明にかかるステア
リングラック軸は、請求項１によれば、管体の外周面に
所定長さで軸方向へ形成されたラック歯の背面の管体内
周面に、前記ラック歯と対応する凹凸面が形成されてい
ることを特徴とする。According to a first aspect of the present invention, there is provided a steering rack shaft according to the present invention. In addition, an uneven surface corresponding to the rack teeth is formed.
【０００７】請求項２によれば、管体の外周面に所定長
さで軸方向へ形成されたラック歯の背面の管体内周面
に、前記ラック歯と対応する凹凸面が形成され、かつ、
該凹凸面と直径方向で相対向する該管体の円周面に、細
長板状の両側端部の突き合わせ面が筋状に形成されてい
ることを特徴とする。According to the second aspect, an irregular surface corresponding to the rack teeth is formed on the inner peripheral surface of the tube behind the rack teeth formed at a predetermined length in the axial direction on the outer peripheral surface of the tube, and ,
On the circumferential surface of the tubular body diametrically opposed to the concave-convex surface, abutting surfaces of both end portions of the elongated plate shape are formed in a streak shape.
【０００８】請求項３によれば、管体の外周面に所定長
さで軸方向へ形成されたラック歯の背面の管体内周面
に、前記ラック歯と対応する凹凸面が形成され、かつ、
該凹凸面と直径方向で相対向する該管体の円周面に、細
長板状の両側端部の突き合わせ面が筋状に形成され、か
つ、その突き合わせ面が溶接にて結合していることを特
徴とする。According to the third aspect, an uneven surface corresponding to the rack teeth is formed on the inner peripheral surface of the tube behind the rack teeth formed at a predetermined length in the axial direction on the outer peripheral surface of the tube, and ,
On the circumferential surface of the tube body diametrically opposed to the uneven surface, butted surfaces of both end portions of the elongated plate shape are formed in a streak shape, and the butted surfaces are joined by welding. It is characterized by.
【０００９】また、この発明にかかるステアリングラッ
ク軸の製造方法は、請求項４によれば、細長板状のワー
クをＵ形に曲げ加工し、円弧部に後記ラック歯と対応す
る凹凸面を有する逆Ｕ形の内型に該ワークを固定してそ
の円弧部にラック歯型を有する外型を所要圧力で押し付
けてラック歯をプレスフォーミングした後、該ワークを
更にＯ形（管状）に曲げ加工することを特徴とする。According to a fourth aspect of the present invention, there is provided a method of manufacturing a steering rack shaft, wherein an elongated plate-shaped workpiece is bent into a U-shape, and an arc portion has an uneven surface corresponding to a rack tooth to be described later. After fixing the work to an inverted U-shaped inner mold and pressing an outer mold having a rack tooth mold on the arc portion thereof at a required pressure to press-form the rack teeth, the work is further bent into an O-shape (tubular). It is characterized by doing.
【００１０】請求項５によれば、細長板状のワークをＵ
形に曲げ加工し、円弧部に後記ラック歯と対応する凹凸
面を有する内型に固定してその円弧部にラック歯型を有
する外型を所要圧力で押し付けてラック歯をプレスフォ
ーミングした後、該ワークを更に管状に曲げ加工し、最
後に該ワークの両側端部の突き合わせ面を溶接にて結合
することを特徴とする。[0010] According to the fifth aspect, the elongated plate-shaped work is formed of U
After bending into a shape, fixing to an inner mold having a concave and convex surface corresponding to the rack teeth described later in the arc part, pressing the outer mold having the rack tooth mold in the arc part at a required pressure and press forming the rack teeth, The work is further bent into a tubular shape, and finally, butted surfaces at both end portions of the work are joined by welding.
【００１１】そして、請求項６によれば、ラック歯型を
有する外型ブロックが固定されており、ワークの円弧部
が前記ラック歯型に対向して配置され、前記ラック歯型
に対応する凹凸面を周縁に備えたローラー状の内型が前
記ワークを外型ブロックへ押し付けながら回動してラッ
ク歯を成形することを特徴とする。According to the present invention, the outer mold block having the rack tooth form is fixed, and the arc portion of the work is arranged to face the rack tooth form, and the unevenness corresponding to the rack tooth form is provided. It is characterized in that a roller-shaped inner mold having a surface on its periphery is rotated while pressing the work against the outer mold block to form rack teeth.
【００１２】したがって、ラック歯を管体の周面に形成
したり、肉厚の増肉工程を要することなく、軽量でコス
ト安価なステアリングラック軸を得ることができる。Therefore, it is possible to obtain a lightweight and inexpensive steering rack shaft without forming rack teeth on the peripheral surface of the tubular body and without requiring a thickening step.
【００１３】[0013]
【発明の実施の形態】以下この発明の実施の形態を図に
基づき説明する。図１（Ａ）に示すように、細長板状の
ワーク１を作成する。このワーク１から図１（Ｄ）に示
すような管状のステアリングラック軸２を作成する。ワ
ーク１の幅Ｗはステアリングラック軸２として必要な直
径の管体の円周長さであり、また、長さＬはステアリン
グラック軸２として必要な軸長又はそれよりも大きいも
のとし、さらに、その肉厚Ｔは軽量化を達成できる所要
の肉厚とする。この実施の形態では後記するように、ラ
ック歯１１はラック歯型１８を有する外型ブロック１５
と凹凸面１９を有する内型ブロック１６（図３参照）と
で形成されるために、肉厚Ｔは比較的小さくてもよい利
点がある。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1A, an elongated plate-shaped work 1 is prepared. From this work 1, a tubular steering rack shaft 2 as shown in FIG. The width W of the work 1 is the circumferential length of the pipe having the diameter required for the steering rack shaft 2, and the length L is the shaft length required for the steering rack shaft 2 or larger. The thickness T is a required thickness capable of achieving weight reduction. In this embodiment, as described later, the rack teeth 11 are formed by an outer die block 15 having a rack tooth form 18.
Since it is formed by the inner block 16 having the uneven surface 19 (see FIG. 3), there is an advantage that the thickness T may be relatively small.
【００１４】ついで、図１（Ｂ）に示すように、このワ
ーク１をＵ形に曲げ加工する。これは、図２に示すよう
に、下型３に所定曲率ｒの円の半分である円弧面を有す
る半円溝４を形成するとともに、上型５に半円溝４の曲
率ｒよりも小なる曲率ｒ1を有する円の半分である円弧
面を有する凸部６を形成する。凸部６の上部は垂直で平
らな壁７，７を両側に形成している。この下型３の半円
溝４の上部にワーク１を載置して上型５でワーク１を半
円溝４内に所定圧力にて押し込むことにより成形され
る。このとき、ワーク１の中心線Ｃが半円溝４の中心線
Ｃ1と一致するように下型３上に載置する。したがっ
て、上型５でワーク１を半円溝４内に押し込むと、半円
溝４に沿って半円形状の円弧部８がワーク１に形成され
るとともに、その円弧部８から上方へ垂直に両側壁９，
９が立ち上がるＵ形体１０が形成される。Next, as shown in FIG. 1B, the work 1 is bent into a U shape. As shown in FIG. 2, the lower die 3 has a semicircular groove 4 having an arc surface that is half of a circle having a predetermined curvature r, and the upper die 5 has a radius smaller than the curvature r of the semicircular groove 4. A convex portion 6 having an arc surface that is a half of a circle having a curvature r 1 is formed. The upper part of the convex portion 6 forms vertical flat walls 7, 7 on both sides. The work 1 is placed on the semicircular groove 4 of the lower mold 3 and the work 1 is pressed into the semicircular groove 4 by the upper mold 5 at a predetermined pressure. At this time, the work 1 is placed on the lower mold 3 such that the center line C of the work 1 coincides with the center line C 1 of the semicircular groove 4. Therefore, when the work 1 is pushed into the semicircular groove 4 by the upper die 5, a semicircular arc portion 8 is formed on the work 1 along the semicircular groove 4, and the work 1 is vertically moved upward from the arc portion 8. Side walls 9,
A U-shaped body 10 from which the 9 rises is formed.
【００１５】次に、図１（Ｃ）に示すように、このＵ形
体１０の円弧部８にラック歯１１を形成する。これは、
図３に示すように、Ｕ形体１０となったワーク１を内型
ブロック１６に冠して逆Ｕ形で円弧部８が上位になるよ
うに配置するとともに、両側壁９，９の外側にそれぞれ
拘束ブロック１７，１７を配置し、この拘束ブロック１
７，１７の内側において外型ブロック１５を昇降可能に
配置する。外型ブロック１５にはラック歯型１８が形成
され、内型ブロック１６の上部にはそのラック歯型１８
に対応する略波形断面等の凹凸面１９が平坦に形成され
ている。Next, as shown in FIG. 1 (C), rack teeth 11 are formed on the arc portion 8 of the U-shaped body 10. this is,
As shown in FIG. 3, the work 1 having the U shape 10 is crowned on the inner block 16 and is arranged in an inverted U shape so that the arc portion 8 is higher. The constraint blocks 17 and 17 are arranged, and this constraint block 1
The outer block 15 is arranged inside the insides 7 and 17 so as to be able to move up and down. A rack tooth pattern 18 is formed on the outer die block 15, and the rack tooth pattern 18 is formed on the upper part of the inner die block 16.
The uneven surface 19 such as a substantially corrugated cross section corresponding to is formed flat.
【００１６】そこで、外型ブロック１５をワーク１の円
弧部８の外周面に所要の圧力でプレス成形すると、ワー
ク１にはラック歯１１が成形される。この場合、図６に
示すように、ラック歯型１８と凹凸面１９とにより、Ｕ
形体１０には円弧部８の外周面にラック歯１１と内周面
に圧痕２０が形成される。このとき、ワーク１は外型ブ
ロック１５、内型ブロック１６、拘束ブロック１７によ
って拘束されるから、ワーク１の素材が他へ逃げること
なく加工されてラック歯１１の各歯はワーク１の肉厚Ｔ
とほぼ等しい肉厚にて成形される。したがって、肉厚Ｔ
の増肉を要することなく、そのため工程を省略できる。Then, when the outer die block 15 is press-formed on the outer peripheral surface of the circular arc portion 8 of the work 1 at a required pressure, the rack teeth 11 are formed on the work 1. In this case, as shown in FIG.
In the form 10, rack teeth 11 are formed on the outer peripheral surface of the arc portion 8 and indentations 20 are formed on the inner peripheral surface. At this time, since the work 1 is constrained by the outer die block 15, the inner die block 16, and the constraining block 17, the material of the work 1 is processed without escaping to other parts, and each tooth of the rack teeth 11 becomes thicker of the work 1. T
It is molded with a wall thickness almost equal to. Therefore, the thickness T
Therefore, it is possible to omit the process without increasing the thickness.
【００１７】なお、ラック歯１１の成形についての他の
例を説明する。これは、図７に示すように、ラック歯型
１８を有する外型ブロック１５が固定されており、図１
（Ｂ）のように形成されたＵ型体１０は外側表面である
円弧部８が前記ラック歯型１８に対向して配置され、前
記ラック歯型１８に対応する凹凸面２６を周縁に備えた
ローラー状の内型２５が前記ワーク１の内側表面側から
該ワーク１を前記外型ブロック１５へ押し付けながら図
示ａ矢印方向へ往復し、かつ、ｂ矢印方向へ回動する。
これにより、ワーク１の円弧部８の外周面にラック歯型
１８によりラック歯１１が形成されるとともに、内周面
には凹凸面２６により圧痕２０が形成される。Another example of forming the rack teeth 11 will be described. As shown in FIG. 7, an outer block 15 having a rack tooth form 18 is fixed, as shown in FIG.
The U-shaped body 10 formed as shown in (B) has an arcuate portion 8 as an outer surface disposed opposite to the rack tooth form 18 and has an uneven surface 26 corresponding to the rack tooth form 18 on the periphery. The roller-shaped inner mold 25 reciprocates in the direction of the arrow a while pressing the work 1 against the outer mold block 15 from the inner surface side of the work 1 and rotates in the direction of the arrow b.
Thus, the rack teeth 11 are formed on the outer peripheral surface of the arc portion 8 of the work 1 by the rack tooth mold 18, and the indentations 20 are formed on the inner peripheral surface by the uneven surface 26.
【００１８】ラック歯１１を形成したワーク１は、図１
（Ｄ）に示すように、Ｏ形（管状）に曲げ加工される。
これは、図４に示すように、半円溝３０を有する上型３
１と下型３２とを用い、下型３２にＵ形体１０の円弧部
８を固定して上型３１で両側壁９，９を所要の圧力で下
型３１に向けて所要の圧力で押し付けることにより、図
５に示すように、両側壁９，９は上型３１の半円溝３０
内に強制的に押し込められ、両側壁９，９の端部はラッ
ク歯１１と直径方向で対面する円周面で筋状の突き合わ
せ面１２が形成され、ラック歯１１を有する軽量で管状
のステアリングラック軸２が形成される。したがって、
この段階で製品化することもできるが、前記筋状の突き
合わせ面１２をそのまま残すと強度的に不足する恐れが
あるので、その筋状の突き合わせ面１２を溶接により結
合して完全な管体とする。The work 1 on which the rack teeth 11 are formed is shown in FIG.
As shown in (D), it is bent into an O shape (tubular).
This is, as shown in FIG. 4, an upper mold 3 having a semicircular groove 30.
Using the lower mold 32 and the lower mold 32, the arc portion 8 of the U-shaped body 10 is fixed to the lower mold 32, and the upper mold 31 presses both side walls 9, 9 toward the lower mold 31 at a required pressure with a required pressure. As a result, as shown in FIG.
The ends of both side walls 9, 9 are formed with a streak-like abutting surface 12 on the circumferential surface diametrically facing the rack teeth 11, and are lightweight and tubular steering wheel having the rack teeth 11. The rack shaft 2 is formed. Therefore,
Although it can be commercialized at this stage, if the streak-like butt surface 12 is left as it is, there is a possibility that strength will be insufficient. Therefore, the streak-like butt surface 12 is joined by welding to form a complete tube. I do.
【００１９】[0019]
【発明の効果】以上説明したこの発明によれば、ワーク
の増肉工程を有することなく、Ｕ形に曲げ加工したワー
クの円弧部に、ラック歯型を有する外型とそのラック歯
型に遊嵌する凹凸面を有する内型とでワークの肉厚にほ
ぼ等しい肉厚のラック歯を形成するので、管状で軽量な
ステアリングラック軸をコスト安価に製造できる。According to the present invention described above, the outer mold having the rack tooth form and the rack mold are provided on the arc portion of the work bent into a U shape without the step of increasing the thickness of the work. Since the rack teeth having a thickness substantially equal to the thickness of the work are formed by the inner mold having the concave and convex surfaces to be fitted, a tubular and lightweight steering rack shaft can be manufactured at low cost.
【図１】この発明の実施の形態を示す工程概要模式図FIG. 1 is a schematic diagram of a process outline showing an embodiment of the present invention.
【図２】Ｕ形の曲げ加工工程の断面図FIG. 2 is a sectional view of a U-shaped bending process;
【図３】ラック歯の成形工程の断面図FIG. 3 is a cross-sectional view of a rack tooth forming process.
【図４】Ｏ形の曲げ加工前期工程の断面図FIG. 4 is a cross-sectional view of the first step of the O-shaped bending process.
【図５】Ｏ形の曲げ加工後期工程の断面図FIG. 5 is a cross-sectional view of the latter stage of the O-shaped bending process.
【図６】ラック歯の成形工程の拡大断面図FIG. 6 is an enlarged sectional view of a rack tooth forming process.
【図７】ラック歯の成形工程の他の例を示す拡大断面図FIG. 7 is an enlarged cross-sectional view showing another example of the step of forming the rack teeth.
１…ワーク ２…ステアリングラック軸 ３，３２…下型 ４，３０…半円溝 ５，３１…上型 ８…円弧部 １０…Ｕ形体 １１…ラック歯 １２…突き合わせ面 １５…外型ブロック １６…内型ブロック １７…拘束ブロック １８…ラック歯型 １９…凹凸面 ２０…圧痕 ２５…ローラ状の内型 ２６…凹凸面 DESCRIPTION OF SYMBOLS 1 ... Work 2 ... Steering rack shaft 3,32 ... Lower mold 4,30 ... Semicircular groove 5,31 ... Upper mold 8 ... Arc part 10 ... U-shaped body 11 ... Rack teeth 12 ... Mating surface 15 ... Outer mold block 16 ... Inner die block 17 ... Restriction block 18 ... Rack tooth mold 19 ... Uneven surface 20 ... Indentation 25 ... Roller-shaped inner die 26 ... Uneven surface
Claims (6)
されたラック歯の背面の管体内周面に、前記ラック歯と
対応する凹凸面が形成されていることを特徴とするステ
アリングラック軸。1. An uneven surface corresponding to the rack teeth is formed on a peripheral surface of the inner surface of the tube on a back surface of the rack teeth formed at a predetermined length in the axial direction on the outer peripheral surface of the tube. Steering rack axis.
されたラック歯の背面の管体内周面に、前記ラック歯と
対応する凹凸面が形成され、かつ、該凹凸面と直径方向
で相対向する該管体の円周面に、細長板状の両側端部の
突き合わせ面が筋状に形成されていることを特徴とする
ステアリングラック軸。2. An uneven surface corresponding to the rack teeth is formed on the inner circumferential surface of the tube on the back surface of the rack teeth formed at a predetermined length in the axial direction on the outer circumferential surface of the tube. A steering rack shaft, characterized in that abutting surfaces of both ends of a slender plate are formed in a streak shape on circumferential surfaces of the pipes which are diametrically opposed to each other.
されたラック歯の背面の管体内周面に、前記ラック歯と
対応する凹凸面が形成され、かつ、該凹凸面と直径方向
で相対向する該管体の円周面に、細長板状の両側端部の
突き合わせ面が筋状に形成され、かつ、その突き合わせ
面が溶接にて結合していることを特徴とするステアリン
グラック軸。3. An uneven surface corresponding to the rack teeth is formed on the inner circumferential surface of the tube behind the rack teeth formed at a predetermined length in the axial direction on the outer circumferential surface of the tube. On the circumferential surfaces of the diametrically opposed pipes, butted surfaces of both ends of an elongated plate are formed in a streak shape, and the butted surfaces are joined by welding. Steering rack axis.
円弧部に後記ラック歯と対応する凹凸面を有する逆Ｕ形
の内型に該ワークを固定してその円弧部にラック歯型を
有する外型を所要圧力で押し付けてラック歯をプレスフ
ォーミングした後、該ワークを更に管状に曲げ加工して
なることを特徴とするステアリングラック軸の製造方
法。4. An elongated plate-shaped workpiece is bent into a U shape,
After fixing the work to an inverted U-shaped inner mold having an uneven surface corresponding to the later-described rack teeth on the arc part and pressing the outer mold having the rack tooth mold against the arc part at a required pressure to press-form the rack teeth. A method of manufacturing a steering rack shaft, wherein the work is further bent into a tubular shape.
円弧部に後記ラック歯と対応する凹凸面を有する内型に
固定してその円弧部にラック歯型を有する外型を所要圧
力で押し付けてラック歯をプレスフォーミングした後、
該ワークを更に管状に曲げ加工し、最後に該ワークの両
側端部の突き合わせ面を溶接にて結合することを特徴と
するステアリングラック軸の製造方法。5. An elongated plate-shaped workpiece is bent into a U shape,
After fixing the inner mold having an uneven surface corresponding to the later-described rack teeth to the arc part and pressing the outer mold having the rack tooth mold at the required pressure on the arc part to press-form the rack teeth,
A method of manufacturing a steering rack shaft, wherein the work is further bent into a tube, and finally, butted surfaces at both end portions of the work are joined by welding.
されており、ワークの円弧部が前記ラック歯型に対向し
て配置され、前記ラック歯型に対応する凹凸面を周縁に
備えたローラー状の内型が前記ワークを外型ブロックへ
押し付けながら回動してラック歯を成形することを特徴
とする請求項１，２又は３記載のステアリング軸の製造
方法。6. A roller to which an outer block having a rack tooth form is fixed, an arc portion of a work is arranged to face the rack tooth form, and a peripheral surface having an uneven surface corresponding to the rack tooth form. 4. The method of manufacturing a steering shaft according to claim 1, wherein said inner die is rotated while pressing said work against said outer die block to form rack teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8534798A JPH11278287A (en) | 1998-03-31 | 1998-03-31 | Steering rack shaft and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8534798A JPH11278287A (en) | 1998-03-31 | 1998-03-31 | Steering rack shaft and method of manufacturing the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11278287A true JPH11278287A (en) | 1999-10-12 |
Family
ID=13856149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8534798A Pending JPH11278287A (en) | 1998-03-31 | 1998-03-31 | Steering rack shaft and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11278287A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1215102A2 (en) | 2000-12-18 | 2002-06-19 | NSK Ltd., | Hollow rack shaft and manufacturing method thereof |
| US6442992B2 (en) | 2000-02-10 | 2002-09-03 | Nsk Ltd. | Hollow rack shaft and method of manufacturing the same |
| US6588293B2 (en) | 2000-04-14 | 2003-07-08 | Nsk Ltd. | Hollow rack shaft |
| US6779271B2 (en) | 2000-03-09 | 2004-08-24 | Nsk Ltd. | Method for manufacturing a hollow rack shaft |
| US6782598B2 (en) | 2000-08-04 | 2004-08-31 | Nsk Ltd. | Method of manufacturing hollow rack shaft |
| JP2012076217A (en) * | 2010-09-30 | 2012-04-19 | Hilti Ag | Device for feeding tool |
| US8176763B2 (en) | 2006-12-22 | 2012-05-15 | Thyssenkrupp Presta Aktiengesellschaft | Steering rack |
| WO2014200040A1 (en) | 2013-06-12 | 2014-12-18 | 日本精工株式会社 | Rack-and-pinion steering gear unit |
-
1998
- 1998-03-31 JP JP8534798A patent/JPH11278287A/en active Pending
Cited By (19)
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|---|---|---|---|---|
| EP1123855A3 (en) * | 2000-02-10 | 2005-02-02 | Nsk Ltd. | Hollow rack shaft and method of manufacturing the same |
| US6442992B2 (en) | 2000-02-10 | 2002-09-03 | Nsk Ltd. | Hollow rack shaft and method of manufacturing the same |
| US6779271B2 (en) | 2000-03-09 | 2004-08-24 | Nsk Ltd. | Method for manufacturing a hollow rack shaft |
| US7069764B2 (en) | 2000-03-09 | 2006-07-04 | Nsk Ltd. | Method for manufacturing a hollow rack shaft |
| EP1132277A3 (en) * | 2000-03-09 | 2007-05-23 | NSK Ltd., | Method for manufacturing a hollow rack shaft |
| US6898853B2 (en) | 2000-03-09 | 2005-05-31 | Nsk Ltd. | Method for manufacturing a hollow rack shaft |
| US6845560B2 (en) | 2000-03-09 | 2005-01-25 | Nsk Ltd. | Method for manufacturing a hollow rack shaft |
| US6588293B2 (en) | 2000-04-14 | 2003-07-08 | Nsk Ltd. | Hollow rack shaft |
| EP1145934A3 (en) * | 2000-04-14 | 2005-04-13 | NSK Ltd., | Hollow rack shaft |
| US6782598B2 (en) | 2000-08-04 | 2004-08-31 | Nsk Ltd. | Method of manufacturing hollow rack shaft |
| US6782772B2 (en) | 2000-12-18 | 2004-08-31 | Nsk Ltd. | Hollow rack shaft and manufacturing method thereof |
| US6763739B2 (en) | 2000-12-18 | 2004-07-20 | Nsk Ltd. | Hollow rack shaft and manufacturing method thereof |
| EP1215102A2 (en) | 2000-12-18 | 2002-06-19 | NSK Ltd., | Hollow rack shaft and manufacturing method thereof |
| US8176763B2 (en) | 2006-12-22 | 2012-05-15 | Thyssenkrupp Presta Aktiengesellschaft | Steering rack |
| JP2012076217A (en) * | 2010-09-30 | 2012-04-19 | Hilti Ag | Device for feeding tool |
| WO2014200040A1 (en) | 2013-06-12 | 2014-12-18 | 日本精工株式会社 | Rack-and-pinion steering gear unit |
| JP2015051765A (en) * | 2013-06-12 | 2015-03-19 | 日本精工株式会社 | Rack and pinion type steering gear unit |
| EP3009329A4 (en) * | 2013-06-12 | 2016-06-22 | Nsk Ltd | Rack-and-pinion steering gear unit |
| US9731750B2 (en) | 2013-06-12 | 2017-08-15 | Nsk Ltd. | Rack-and-pinion steering gear unit |
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