JPS6033847A - Production of driving shaft having high torsional strength - Google Patents
Production of driving shaft having high torsional strengthInfo
- Publication number
- JPS6033847A JPS6033847A JP13939183A JP13939183A JPS6033847A JP S6033847 A JPS6033847 A JP S6033847A JP 13939183 A JP13939183 A JP 13939183A JP 13939183 A JP13939183 A JP 13939183A JP S6033847 A JPS6033847 A JP S6033847A
- Authority
- JP
- Japan
- Prior art keywords
- driving shaft
- steel pipe
- serration
- neck
- torsional strength
- 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
- B21K1/06—Making machine elements axles or shafts
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野〕
本発明は捩り強度に優れた駆動軸の製造方法に係り、特
に小径の鋼管を用いて、前輪駆動重用のドライブシャフ
ト等の駆動軸を製造する方法に関するものである。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a method of manufacturing a drive shaft with excellent torsional strength, and in particular to manufacturing a drive shaft such as a drive shaft for a heavy-duty front wheel drive vehicle using a small diameter steel pipe. It's about how to do it.
(従来技術)
最近、自動車用部品の軽量化と信頼性向上がめられてい
るが、その一つとして、従来棒鋼からなる部品の中空化
、即ち鋼管化が進められてbる。(Prior Art) Recently, efforts have been made to reduce the weight and improve the reliability of automobile parts, and one of these efforts is to make parts conventionally made of steel bars hollow, that is, to make them into steel pipes.
その部品のなかで、前輪駆動車用ドライブシャフトなど
の駆動軸を鋼管を素材として製造Tる場合。Among these parts, drive shafts such as drive shafts for front-wheel drive vehicles are manufactured using steel pipes.
冷間絞り成形後、管端部を熱間アプセット加工し。After cold drawing, the tube end is hot upset.
当該部位にセレーション(歯車)加工等を施して。Apply serrations (gear) processing etc. to the relevant part.
駆動力の伝達部位とすることがある。この様な一体絞り
成形ドライブシャフトとしては、従来、継目無鋼管を用
いて第1図に示すようic、駆動力の伝達部であるセレ
ーション部1よりもセレーション頚部2(セレーション
部tこ隣接する縮径加工部)の外径部が大きい駆動軸が
使用されていた。ところが、前輪駆動車の性能向上の一
つとして最小回転半径を小さくする。という目的からセ
レーション頚部2の外径を小さくすることによって、ハ
ウジングとの接触を防ぎ、ハンドル切れ角を大きくする
ことが望まれていた。更に、素材のコスト低減を月相し
て、電縫溶接管を使用することが望まれるようになった
。これに鑑み、各種の試みがこれ1でに為されているが
、いずれも問題を解決するには至っていない。It may be used as a driving force transmission part. Conventionally, such an integrally drawn drive shaft is made of a seamless steel pipe, and as shown in FIG. A drive shaft with a large outer diameter part (diameter processing part) was used. However, one way to improve the performance of front-wheel drive vehicles is to reduce the minimum turning radius. For this purpose, it has been desired to reduce the outer diameter of the serration neck 2 to prevent contact with the housing and increase the steering angle. Furthermore, with the aim of reducing the cost of materials, it has become desirable to use electric resistance welded pipes. In view of this, various attempts have been made, but none of them have been able to solve the problem.
たとえば第2図(a)はセレーション頚部2の外径がセ
レーション部1の歯元径よりも小さい一体絞り成形によ
る駆動軸を示すものである。しかし乍ら同図(b)lこ
示すようlこ、中実部3の範囲がセレーション部1の範
囲と概ね等しくなる場合、セレーンヨン頚部2における
断面形状は、継目無鋼管を用いた場合は同図(C)ζこ
、電縫溶接部4を有する溶接鋼管を用いた場合は同図(
d)に示すように、いずれも管内面に/ワが生じ、駆動
軸ζこ捩り力が負荷された場合、描該シワより亀裂が発
生・成長して駆動軸強度を著しく低下させることになる
。For example, FIG. 2(a) shows a drive shaft formed by integral drawing, in which the outer diameter of the serration neck portion 2 is smaller than the root diameter of the serration portion 1. However, as shown in Figure (b), if the range of the solid part 3 is approximately equal to the range of the serration part 1, the cross-sectional shape of the selenium neck part 2 will be the same when a seamless steel pipe is used. Figure (C)
As shown in d), when wrinkles are formed on the inner surface of the tube and torsional force is applied to the drive shaft, cracks will form and grow from the wrinkles, significantly reducing the strength of the drive shaft. .
寸た第3図(a)は熱間加工範囲を拡大し、セレーショ
ン頚部2の増肉率を増した場合の軸方向断面形状である
。し力)し乍らこの場合も第2図の場合と同様に、その
セレーション頚部2におケル断面形状は同図(b) i
こ示す継目無鋼管を用いた場合、および同図(C)に示
す電縫溶接管を用いた場合のようζこ、いずれも管内面
にシワが発生して、これによって駆動軸強度は低下する
。FIG. 3(a) shows the axial cross-sectional shape when the hot working range is expanded and the thickness increase rate of the serration neck 2 is increased. However, in this case, as in the case of Fig. 2, the cross-sectional shape of the serration neck 2 is as shown in Fig. 2(b) i
When using the seamless steel pipe shown here, and when using the electric resistance welded pipe shown in the same figure (C), wrinkles occur on the inner surface of the pipe, which reduces the strength of the drive shaft. .
(発明の目的・構成〕
本発明は、かかる実状に鑑み、捩り強度に優れた駆動軸
の製造を可能とするものであって、その要旨とするとこ
ろは、鋼管の端部を絞り加工によって縮径した後、熱間
加工tこよって中実部を形成して駆動軸を製造するに際
し、セレーション部とセレーンヨン頚部を一体に中実成
形することを特徴とする。捩り強度lこ優れた駆動軸の
製造方法にある。(Objective and Structure of the Invention) In view of the above-mentioned circumstances, the present invention makes it possible to manufacture a drive shaft with excellent torsional strength, and its gist is to shrink the end of a steel pipe by drawing. The drive shaft is characterized in that the serration part and the neck part of the serrations are integrally formed into a solid part when the drive shaft is manufactured by hot working after diametralizing the diameter.The drive shaft has excellent torsional strength. It is in the manufacturing method.
以下本発明の詳細な説明する。The present invention will be explained in detail below.
第4図(a)は本発明法の実施態様を示すものであって
、同図に示すように、中実部3の範囲をセレーション部
1およびセレーション頚部2 f全て含むか、又はこれ
以上の範囲にとり、軸方向断面形状を同図に示すよう)
こ成形するものである。加熱方法は炉扉熱炎、および高
周波誘導加熱等があり特に限定するものではないが、急
速fこ加熱して。FIG. 4(a) shows an embodiment of the method of the present invention, and as shown in the figure, the range of the solid part 3 includes all of the serration part 1 and the serration neck part 2f, or more than (as shown in the figure)
This is what is molded. Heating methods include furnace door hot flame, high frequency induction heating, etc., and are not particularly limited, but rapid heating is used.
あるいは、非加熱部【こ冷し型等を用いて熱影響部が地
に及ばぬようにして、加熱範囲を中実部形成域に限定す
る。これを同図(b) lこ示す様lこ、外周部をダイ
ス6および7によって拘束し、プランジャー8で加熱部
に対して十分なアブセット力を加えるす、セレー/ヨン
部1およびセレーション頚部2は中実となり、しかもア
プセット部の先端5が管軸に対してほぼ垂直な形状とな
るものである。Alternatively, the heating range is limited to the area where the solid part is formed by preventing the heat-affected zone from reaching the ground using a non-heated part (cooling mold, etc.). As shown in Figure (b), the outer periphery is restrained by the dies 6 and 7, and the plunger 8 applies a sufficient absorbing force to the heated part. 2 is solid, and the tip 5 of the upset portion is approximately perpendicular to the tube axis.
(発明の効果)
この様1こして成形・加工された駆動軸の素形材では、
セレーション頚部2より外径の大きい絞り加工部におけ
る内面、およびアプセット部の先端5において/ワの発
生は殆んどなく、この後の焼入れ処理において、強度計
算上から要求される硬度と焼入れ深さを確保することが
可能であり、しかも亀裂発生の核となるシワの発生が殆
んど無いことから、捩り強度lこ対して極めて優れた強
度を有する駆動軸を製造することが出来る。(Effect of the invention) In the drive shaft material formed and processed in this way,
There is almost no occurrence of cracks on the inner surface of the drawn part, which has a larger outer diameter than the serration neck 2, and on the tip 5 of the upset part, and in the subsequent hardening process, the hardness and hardening depth required from the strength calculation are achieved. Moreover, since wrinkles, which become the core of crack generation, are hardly generated, it is possible to manufacture a drive shaft having extremely superior torsional strength.
(実施例)
以下、実施例によって2本発明の効果を更に具体的に示
す。(Example) Hereinafter, the effects of the present invention will be illustrated more specifically by examples.
540C相当材で、φ40.0Xt4.5の電縫溶接管
を用い、絞り段数を3段としてセレーション頚部をφ2
2.0Xt6.8とした。第2図(b)に示す様lこセ
レーション部を含む40喘壕での範囲を高周波加熱「こ
よって加熱をして中実とした時、セレーション頚部ζこ
おける断面形状を観察した結果。Using a material equivalent to 540C, use a φ40.0Xt4.5 electric resistance welded pipe, set the number of drawing stages to 3, and make the serration neck φ2.
2.0Xt6.8. As shown in Figure 2 (b), when the area of 40 trenches including the serrations was heated by high frequency heating to make it solid, the cross-sectional shape of the serration neck was observed.
溶接部近傍の内面において最大0.05mの亀裂が認め
られた。その為表面硬度をHV=650.焼入れ深さ5
簡として高周波熱処理1こよって焼入れを行って捩り疲
労試験を行うと、第5図IIこ示す様なS−N関係が得
られた。ここで疲労亀裂の発生源は、内面の溶接部近傍
のシワによる亀裂である。A crack with a maximum length of 0.05 m was observed on the inner surface near the weld. Therefore, the surface hardness is HV=650. Hardening depth 5
Briefly, when quenching was performed using induction heat treatment 1 and a torsional fatigue test was performed, an S-N relationship as shown in FIG. 5 II was obtained. Here, the source of fatigue cracks is cracks caused by wrinkles near the welds on the inner surface.
これtこ対して、同一の素材・形状で、高周波加熱ζこ
よる加熱範囲を拡大し、第4図に示す様に。On the other hand, with the same material and shape, the heating range due to high frequency heating ζ has been expanded, as shown in Fig. 4.
セレーション部子セレーション頚部で80 mlでを中
実とした。この場合、加熱・鍛造は各々1サイクルで実
施可能であり、製造コストの差は僅がである。表面硬度
Hv = 650 、焼入れ深さ6聴として焼入′i″
Lを行い、捩り疲労試験の結果を第5図Illこ示す。The serration part was made solid with 80 ml at the serration neck. In this case, heating and forging can each be performed in one cycle, and the difference in manufacturing cost is small. Quenched with surface hardness Hv = 650 and hardening depth of 6 mm.
The results of the torsional fatigue test are shown in Figure 5.
捩り疲労寿命は約5倍上昇し、亀裂の発生も表面の微細
な欠陥で十分に実用に耐える事が明らかである。It is clear that the torsional fatigue life is increased by about 5 times, and that cracks are generated only by minute defects on the surface and are sufficiently durable for practical use.
第1図は従来の一体絞り成形ドライブシャフトの外観図
である。第2図(a)はセレーション頚部外径が小さな
ドライブシャフトの外観図、同図(b)はその縦断面図
で、同図(りは継目無鋼管を用いた場合のセレーション
頚部の横断面図、同図(d)は電縫溶接管を用いた場合
のセレーション頚部の横断面図である。第3図(a)は
加熱範囲を拡大した場合の縦断面形状図、同図(b)は
継目無鋼管を用いた場合のセレーション頚部横断面図、
同図(りは電縫溶接管を各々用いた場合のセレーション
頚部横断面図である。第4図(a)は本発明によるドラ
イブシャフトの縦断面形状図、同図(b)はアブセント
加工要領を示す模式図、第5図はS−N曲線を示す図で
ある。
1°・・・セレーション部、2・・・セレーション頚部
。
3・・・中実部、4・・・電縫溶接部、5・・・アプセ
ット部の先端、6,7・・・ダイス、8・・・プランジ
ャー。
特許出願人 代理人
弁理士矢葺知之
(ほか1名〕FIG. 1 is an external view of a conventional integrally drawn drive shaft. Figure 2 (a) is an external view of a drive shaft with a small outer diameter of the serration neck, Figure 2 (b) is a longitudinal cross-sectional view thereof, and Figure 2 (a) is a cross-sectional view of the serration neck when seamless steel pipe is used. , FIG. 3(d) is a cross-sectional view of the serration neck when an electric resistance welded pipe is used. FIG. 3(a) is a vertical cross-sectional view when the heating range is expanded, and FIG. Cross-sectional view of serration neck when seamless steel pipe is used,
4(a) is a cross-sectional view of the serration neck when each electric resistance welded pipe is used. FIG. 4(a) is a vertical cross-sectional view of the drive shaft according to the present invention, and FIG. FIG. 5 is a diagram showing an S-N curve. 1°...Serration part, 2... Serration neck part. 3... Solid part, 4... Electric resistance welding part. , 5...Tip of the upset part, 6, 7...Dice, 8...Plunger. Patent applicant Representative Patent Attorney Tomoyuki Yabuki (and 1 other person)
Claims (1)
こよって中実部を形成して駆動軸を製造するに際し、セ
レーション部とセレーションの頚部を一体に中実成形す
ることを特徴とする。捩り強度に優れた駆動軸の製造方
法。After reducing the diameter of the end of the steel pipe by drawing, a solid part is formed by a hot processing vessel to manufacture the drive shaft, and the serration part and the neck part of the serration are integrally formed into a solid part. do. A method for manufacturing a drive shaft with excellent torsional strength.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13939183A JPS6033847A (en) | 1983-08-01 | 1983-08-01 | Production of driving shaft having high torsional strength |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13939183A JPS6033847A (en) | 1983-08-01 | 1983-08-01 | Production of driving shaft having high torsional strength |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6033847A true JPS6033847A (en) | 1985-02-21 |
Family
ID=15244203
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13939183A Pending JPS6033847A (en) | 1983-08-01 | 1983-08-01 | Production of driving shaft having high torsional strength |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6033847A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06262291A (en) * | 1993-03-09 | 1994-09-20 | Mitsuba Electric Mfg Co Ltd | Drive shaft in wiper device and its forming method |
US5728340A (en) * | 1992-10-26 | 1998-03-17 | E. I. Du Pont De Nemours And Company | Process for polyesterurethaneurea thin-walled articles |
EP0941783A1 (en) * | 1998-03-09 | 1999-09-15 | BPW Bergische Achsen Kommanditgesellschaft | Method of manufacturing an one-piece axle body and axle body manufactured by such a method |
KR100348272B1 (en) * | 2000-06-21 | 2002-08-09 | 엘지전자주식회사 | Methode and Device for manufacturing a solid-type driving shaft |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55119503A (en) * | 1979-03-05 | 1980-09-13 | Lear Siegler Inc | Wheel axle with end* which is not hollow* and its preparation |
-
1983
- 1983-08-01 JP JP13939183A patent/JPS6033847A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55119503A (en) * | 1979-03-05 | 1980-09-13 | Lear Siegler Inc | Wheel axle with end* which is not hollow* and its preparation |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5728340A (en) * | 1992-10-26 | 1998-03-17 | E. I. Du Pont De Nemours And Company | Process for polyesterurethaneurea thin-walled articles |
JPH06262291A (en) * | 1993-03-09 | 1994-09-20 | Mitsuba Electric Mfg Co Ltd | Drive shaft in wiper device and its forming method |
EP0941783A1 (en) * | 1998-03-09 | 1999-09-15 | BPW Bergische Achsen Kommanditgesellschaft | Method of manufacturing an one-piece axle body and axle body manufactured by such a method |
KR100348272B1 (en) * | 2000-06-21 | 2002-08-09 | 엘지전자주식회사 | Methode and Device for manufacturing a solid-type driving shaft |
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