JPS6358305B2 - - Google Patents
Info
- Publication number
- JPS6358305B2 JPS6358305B2 JP56080374A JP8037481A JPS6358305B2 JP S6358305 B2 JPS6358305 B2 JP S6358305B2 JP 56080374 A JP56080374 A JP 56080374A JP 8037481 A JP8037481 A JP 8037481A JP S6358305 B2 JPS6358305 B2 JP S6358305B2
- Authority
- JP
- Japan
- Prior art keywords
- rod
- rack
- auxiliary rod
- rack shaft
- hollow
- 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.)
- Expired
Links
- 239000000463 material Substances 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 description 6
- 238000005242 forging Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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
-
- 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
- B21K1/768—Toothed racks hollow
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gears, Cams (AREA)
- Forging (AREA)
Description
【発明の詳細な説明】
本発明はラツク軸の製造方法に関し、ラツク軸
の強度を低下させることなく全体の軽量化を図る
ことを目的とするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a rack shaft, and an object of the present invention is to reduce the overall weight of the rack shaft without reducing its strength.
一般に軸の強度を満足しつつ重量を低減する手
段として中空丸棒を使用することが広く行なわれ
ている。ところが、ラツク軸の素材を中空丸棒と
した場合には、素材肉部を切削加工することによ
りラツク歯の部分の肉厚が薄くなつて強度が著し
く低下するという問題が生じることから、強度が
要求されるラツク軸、例えばラツクピニオン式舵
取装置のラツク軸にはこのような手段を採用する
ことはできなかつた。 In general, hollow round rods are widely used as a means of reducing weight while satisfying the strength of the shaft. However, when the material of the rack shaft is a hollow round bar, there is a problem in that the thickness of the rack teeth becomes thinner due to cutting of the material part and the strength decreases significantly. It has not been possible to adopt such a means for the required rack shaft, for example, for a rack shaft of a rack and pinion type steering device.
しかして、充分な強度のラツク歯を有し、かつ
軽量なラツク軸として、例えば実開昭54−112235
号公報において、ラツク歯を形成する部分を中実
軸、その多の部分を中空軸とし、これら両軸を溶
接等により結合したものが提案されている。しか
し、このように溶接により両軸を結合すると、こ
の結合部分に曲りが生じ易く、このためこの曲り
部分の矯正作業が必要となり、また、結合部分の
強度性能が充分ではないというおそれがある。 Therefore, as a lightweight rack shaft with sufficiently strong rack teeth, for example,
In this publication, it is proposed that the part forming the rack teeth is a solid shaft, the other part is a hollow shaft, and the two shafts are joined by welding or the like. However, when the two shafts are joined together by welding in this manner, the joint portion is likely to be bent, which requires work to correct the bent portion, and there is also a risk that the strength performance of the joint portion may not be sufficient.
本発明は以上の問題点を解消し、軽量、かつ、
強度性能の充分なラツク軸を確実かつ容易に製造
する方法を得ることを目的としてなされたもの
で、中空棒の穴に、この棒よりも短い補助棒を嵌
挿した後、この補助棒嵌挿部分に塑性加工を施す
ことにより、該補助棒嵌挿部分における上記中空
棒にラツク歯を成形することを特徴としている。 The present invention solves the above problems, is lightweight, and
This was done with the aim of obtaining a method for reliably and easily manufacturing a rack shaft with sufficient strength and performance.After inserting an auxiliary rod shorter than the rod into a hole in a hollow rod, the auxiliary rod is inserted into the hole. It is characterized in that the hollow rod in the auxiliary rod insertion portion is formed with rack teeth by plastic working the portion.
以下図示実施例により本発明を説明する。第１
図は本発明方法により製造されたラツク軸１を適
用したラツクピニオン式舵取装置２を示したもの
である。すなわち、ラツクピニオン式舵取装置２
のケース３内にはラツク軸１を摺動自在に貫通さ
せ、このラツク軸１のラツク歯４には図示しない
舵取ハンドルに連動させたピニオン５を噛合させ
ている。また、ケース３に摺動自在に設けた筒状
部材６の端面をばね７によりその外周面８に弾接
させ、そのばね７の弾発力によりラツク歯４をピ
ニオン５側に附勢している。しかしてラツク軸１
は中空棒から成形され、その穴９のうち、上記ラ
ツク歯４が形成された部分には、この穴９の径と
略同径の補助棒１０を挿入している。 The present invention will be explained below with reference to illustrated embodiments. 1st
The figure shows a rack and pinion type steering device 2 to which a rack shaft 1 manufactured by the method of the present invention is applied. In other words, the rack and pinion steering device 2
A rack shaft 1 is slidably passed through the case 3, and a pinion 5 interlocked with a steering handle (not shown) is engaged with the rack teeth 4 of the rack shaft 1. Further, the end face of a cylindrical member 6 slidably provided on the case 3 is brought into elastic contact with the outer circumferential surface 8 of the cylindrical member 6 by a spring 7, and the elastic force of the spring 7 urges the rack teeth 4 toward the pinion 5. There is. However, easy axis 1
is formed from a hollow rod, and an auxiliary rod 10 having approximately the same diameter as the hole 9 is inserted into the portion of the hole 9 where the rack teeth 4 are formed.
次に、上記ラツク軸１の製造方法について説明
する。ラツク軸１の素材１１は、第２図に示すよ
うに、軸心部に穴９を有する中空棒であり、まず
この素材１１の穴９内に補助棒１０を嵌挿する。
補助棒１０は、素材１１の約1/4〜1/2の長さを有
し、その端面が素材１１の端面に合致する位置ま
で挿入される。補助棒１０の素材１１への嵌挿
は、素材１１の内径を補助棒１０の外径よりも若
干大きく設定して行なうが、必要に応じては両者
をろう付け等により仮着けしてもよく、またこれ
に代え補助棒１０の外径を穴９よりも若干大径と
しておき、圧力ばめもしくは焼ばめにより行なつ
てもよい。なお、本実施例においては、材質は、
素材１１をSCM415、補助棒１０をSCとしてい
るが、目的に応じて他のものを使用することも勿
論よい。 Next, a method of manufacturing the rack shaft 1 will be explained. As shown in FIG. 2, the material 11 of the rack shaft 1 is a hollow rod having a hole 9 in the shaft center, and the auxiliary rod 10 is first inserted into the hole 9 of the material 11.
The auxiliary rod 10 has a length of about 1/4 to 1/2 of the material 11, and is inserted until its end surface matches the end surface of the material 11. The auxiliary rod 10 is inserted into the material 11 by setting the inner diameter of the material 11 slightly larger than the outer diameter of the auxiliary rod 10, but if necessary, the two may be temporarily attached by brazing or the like. Alternatively, the outer diameter of the auxiliary rod 10 may be made slightly larger than the hole 9, and the fitting may be performed by pressure fitting or shrink fitting. In addition, in this example, the material is
Although the material 11 is SCM415 and the auxiliary rod 10 is SC, it is of course possible to use other materials depending on the purpose.
次いで温間鍛造、冷間鍛造および転造加工など
の塑性加工によりラツク歯４の成形を行なう。す
なわち、まず上記補助棒１０を嵌挿した素材１１
に適当な熱処理を施して金属組織の均一化を図つ
た後、塑性加工を行なう。第３図は一例として鍛
造を行なつている様子を示したもので、上型１２
は上記外周部８を成形するための形状を呈し、下
型１３はラツク歯４を成形するための歯型部１４
を有している。そして、この成形加工によりラツ
ク歯４の成形と同時に素材１１と補助棒１０との
緊密な一体化を図ることができる。 Next, the rack teeth 4 are formed by plastic working such as warm forging, cold forging, and rolling. That is, first, the material 11 into which the auxiliary rod 10 is inserted is
After applying appropriate heat treatment to make the metal structure uniform, plastic working is performed. Figure 3 shows an example of how forging is being carried out, with the upper die 12
has a shape for molding the outer peripheral part 8, and the lower mold 13 has a tooth mold part 14 for molding the rack teeth 4.
have. Through this forming process, the material 11 and the auxiliary rod 10 can be closely integrated at the same time as the rack teeth 4 are formed.
この塑性加工による成形の後、バリ取り等の仕
上げ加工を行ない必要に応じて適当な熱処理を施
した後検査工程を経て、第４図に示すようなラツ
ク軸１が完成する。 After forming by this plastic working, finish processing such as deburring is performed, appropriate heat treatment is performed as required, and an inspection process is performed to complete the rack shaft 1 as shown in FIG. 4.
以上のような塑性加工の場合、熱処理におい
て、金属組織の均一化は素材１１のみでよく、し
たがつて従来のように中実棒の熱処理に比較して
加熱エネルギが少なくてよい。またラツク歯４の
成形時において、材料流動は主に素材１１に生
じ、補助棒１０にはほとんど起こらないので、こ
の成形に要する動力も少なくてよい。 In the case of plastic working as described above, the metal structure of the material 11 only needs to be made uniform during the heat treatment, and therefore less heating energy is required compared to the conventional heat treatment of a solid bar. Further, when forming the rack teeth 4, material flow mainly occurs in the raw material 11 and hardly occurs in the auxiliary rod 10, so that the power required for this forming may be small.
さらに、素材１１に対して補助棒１０の材質を
選ぶことにより、加工上、強度上に種々の特性を
付与することができる。しかも、本発明方法に係
るラツク軸１は一本の中空棒から形成したもので
あるから、軽量であることは勿論のこと、強度的
にもすぐれたものを得ることができる。また、加
工の最終処理工程において曲り直し、Ｘ線材料組
織検査等の工程が不要であり、その製造が容易で
ある。 Furthermore, by selecting the material of the auxiliary rod 10 with respect to the raw material 11, various characteristics in terms of processing and strength can be imparted. Moreover, since the rack shaft 1 according to the method of the present invention is formed from a single hollow rod, it is not only lightweight but also has excellent strength. Further, in the final processing step of processing, steps such as re-bending and X-ray material structure inspection are not necessary, and manufacturing is easy.
また、補助棒１０は必ずしも中実棒とする必要
はなく目的に応じて中空棒としてもよい。 Further, the auxiliary rod 10 does not necessarily have to be a solid rod, and may be a hollow rod depending on the purpose.
以上の如く、本発明方法によれば、中空棒の穴
に、この棒よりも短い補助棒を嵌挿した後、この
補助棒嵌挿部分に塑性加工を施すことにより、該
補助棒嵌挿部分における上記中空棒にラツク歯を
成形するものであるから、ラツク歯成形部の強度
が保証されるのみでなく、ラツク軸の軽量化をも
達成でき、しかも塑性加工時にラツク歯の成形と
ともに中空棒と補助棒との一体化を、他の手段を
用いずして同時になし得られ、また主たる塑性変
形は中空棒部分でなされるため、加工あるいは熱
処理に要する処理エネルギを小さく抑え得る効果
がある。 As described above, according to the method of the present invention, after an auxiliary rod shorter than the rod is inserted into a hole of a hollow rod, the auxiliary rod insertion portion is plastically worked. Since the rack teeth are formed on the hollow rod mentioned above, not only the strength of the rack tooth molded part is guaranteed, but also the weight of the rack shaft can be reduced. The auxiliary rod can be integrated with the auxiliary rod at the same time without using other means, and the main plastic deformation occurs in the hollow rod portion, which has the effect of keeping the processing energy required for machining or heat treatment to a low level.
第１図は本発明方法により製作されたラツク軸
を適用したラツクピニオン式舵取装置を示す断面
図、第２図は、ラツク軸の素材および補助棒を示
す斜視図、第３図は鍛造工程を示す斜視図、第４
図は本発明方法により製作されたラツク軸を示す
斜視図である。
１……ラツク軸、４……ラツク歯、９……穴、
１０……補助棒、１１……中空棒（素材）。
Fig. 1 is a sectional view showing a rack and pinion type steering device using a rack shaft manufactured by the method of the present invention, Fig. 2 is a perspective view showing the material of the rack shaft and an auxiliary rod, and Fig. 3 is a forging process. Perspective view showing 4th
The figure is a perspective view showing a rack shaft manufactured by the method of the present invention. 1...Rack shaft, 4...Rack tooth, 9...Hole,
10... Auxiliary rod, 11... Hollow rod (material).
Claims (1)
挿した後、この補助棒嵌挿部分に塑性加工を施す
ことにより、該補助棒嵌挿部分における上記中空
棒にラツク歯を成形することを特徴とするラツク
軸の製造方法。 ２ 補助棒が中実棒であることを特徴とする特許
請求の範囲第１項記載のラツク軸の製造方法。 ３ 補助棒が中空棒であることを特徴とする特許
請求の範囲第１項記載のラツク軸の製造方法。 ４ 中空棒と補助棒とが異なる材質であることを
特徴とする特許請求の範囲第１項ないし第３項の
いずれかに記載のラツク軸の製造方法。[Scope of Claims] 1. After inserting an auxiliary rod shorter than this rod into the hole of the hollow rod, the hollow rod in the auxiliary rod insertion portion is plastically worked on the auxiliary rod insertion portion. A method for manufacturing a rack shaft, characterized by forming rack teeth on the shaft. 2. The method for manufacturing a rack shaft according to claim 1, wherein the auxiliary rod is a solid rod. 3. The method for manufacturing a rack shaft according to claim 1, wherein the auxiliary rod is a hollow rod. 4. The method for manufacturing a rack shaft according to any one of claims 1 to 3, wherein the hollow rod and the auxiliary rod are made of different materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8037481A JPS57195960A (en) | 1981-05-27 | 1981-05-27 | Rack shaft and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8037481A JPS57195960A (en) | 1981-05-27 | 1981-05-27 | Rack shaft and its manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57195960A JPS57195960A (en) | 1982-12-01 |
| JPS6358305B2 true JPS6358305B2 (en) | 1988-11-15 |
Family
ID=13716499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8037481A Granted JPS57195960A (en) | 1981-05-27 | 1981-05-27 | Rack shaft and its manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57195960A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58218339A (en) * | 1982-06-11 | 1983-12-19 | Daido Steel Co Ltd | Steering rod for vehicle and its manufacture |
| ES522273A0 (en) * | 1983-04-28 | 1984-04-16 | Bendiberica Sa | ELECTRICALLY ASSISTED STEERING MECHANISM FOR CARS |
| JPS60108132A (en) * | 1983-11-16 | 1985-06-13 | Jidosha Kiki Co Ltd | Method and device for forging hollow rough material |
| JPS61228161A (en) * | 1985-04-02 | 1986-10-11 | Tokai T R W Kk | Core-filled rack bar |
| JPS6299261A (en) * | 1985-10-25 | 1987-05-08 | Jidosha Kiki Co Ltd | Rack shaft in rack and pinion steering device and manufacture thereof |
| JP2554165Y2 (en) * | 1990-11-14 | 1997-11-12 | 株式会社山田製作所 | Steering rack shaft |
| JP4539292B2 (en) * | 2004-11-01 | 2010-09-08 | 株式会社ジェイテクト | Rack bar |
| US7950153B2 (en) | 2005-03-23 | 2011-05-31 | Bishop Innovation Limited | Method of manufacturing a steering rack |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5730662A (en) * | 1980-07-29 | 1982-02-18 | Toyota Motor Corp | Rack bar in rack-pinion steering device for behicle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54112235U (en) * | 1978-01-26 | 1979-08-07 |
-
1981
- 1981-05-27 JP JP8037481A patent/JPS57195960A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5730662A (en) * | 1980-07-29 | 1982-02-18 | Toyota Motor Corp | Rack bar in rack-pinion steering device for behicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57195960A (en) | 1982-12-01 |
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