JPH0471729A - Manufacture of cam shaft - Google Patents
Manufacture of cam shaftInfo
- Publication number
- JPH0471729A JPH0471729A JP2182919A JP18291990A JPH0471729A JP H0471729 A JPH0471729 A JP H0471729A JP 2182919 A JP2182919 A JP 2182919A JP 18291990 A JP18291990 A JP 18291990A JP H0471729 A JPH0471729 A JP H0471729A
- Authority
- JP
- Japan
- Prior art keywords
- cam
- piece
- pipe material
- shape
- cam piece
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000000463 material Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000002265 prevention Effects 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 abstract description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 238000000465 moulding Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明はカムシャフトの製造方法に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing a camshaft.
（従来の技術）
エンジンの吸、排気弁を作動させるカムシャフトは、従
来鋳造あるいは鍛造により製造されていたが、これによ
ると使用材料が多く重量が嵩むため、近時バイブ材の周
面にカムピースを固着して軽量化を図ったカムシャフト
が着目されている。(Prior technology) Camshafts that operate the intake and exhaust valves of engines have traditionally been manufactured by casting or forging, but this method requires a large amount of material and is heavy, so in recent years, camshafts have been installed on the circumferential surface of the vibrator. A camshaft that is lightweight by fixing it is attracting attention.
この場合、カムピースをパイプ材に圧接固定したあと相
互に回転することがないように固着することがバルブの
開閉タイミングを正しく保つうえにおいて肝要であり、
そのためカムピースの内周面にスプライン状の溝を形成
し、バルジ加工時にパイプ材がこの溝に圧入して回り止
めとしたもの（特開昭５９−１３０６３２号公報）、あ
るいはカムピースの内周面に突起を設け、パイプ材に固
着する際に突起がパイプ材に圧入して回り止めとすると
ともにパイプ材の膨出変形に無理が生じないようにした
もの（特開昭５９−１４４５３２号公報）などがある。In this case, it is important to secure the cam piece to the pipe material so that they do not rotate relative to each other in order to maintain the correct opening and closing timing of the valve.
Therefore, a spline-like groove is formed on the inner circumferential surface of the cam piece, and a pipe material is press-fitted into this groove during bulge processing to prevent rotation (Japanese Patent Application Laid-open No. 59-130632). A type in which a protrusion is provided and the protrusion is press-fitted into the pipe material to prevent it from rotating when it is fixed to the pipe material, and also to prevent unreasonable expansion and deformation of the pipe material (Japanese Patent Laid-Open Publication No. 144532/1983), etc. There is.
（発明が解決しようとする課題）
かしながら上記のいずれのものも、カムピースの内周面
に溝や突起を設けるため、カムピースを焼結合金または
鋳物で一体成形することが必要であり、勢いコストが嵩
むという問題点がある。(Problem to be Solved by the Invention) However, in all of the above methods, in order to provide grooves and protrusions on the inner circumferential surface of the cam piece, it is necessary to integrally mold the cam piece with a sintered alloy or a casting, and the force There is a problem that the cost increases.
本発明はこれに鑑み、低コストにより得ることができる
カムシャフトの製造方法を提供することを目的としてな
されたものである。In view of this, the present invention has been made for the purpose of providing a method of manufacturing a camshaft that can be obtained at low cost.
（課題を解決するための手段）
上記従来技術の問題点を解決する手段として本発明は、
パイプ材により周面形状が所定のカム形状を有するカム
ピースを成形し、このカムピースの凸部となる部位の内
面形状に合致する断面形状に成形され前記カムピースの
厚さに略等しい長さを有する回り止めピースを設け、こ
の回り止めピースを前記凸部の内面に仮付けし、ついで
これらカムピースにパイプ材を挿通してバルジ型内に納
め、カムピース嵌全部位のパイプ材をバルジ加工により
膨出させてカムピースの内周面形状および回り止めピー
スにならって圧接固定することを特徴とするするもので
ある。(Means for Solving the Problems) As a means for solving the problems of the above-mentioned prior art, the present invention provides the following:
A cam piece whose circumferential surface has a predetermined cam shape is formed from a pipe material, and the cam piece is formed into a cross-sectional shape that matches the inner surface shape of the portion that becomes the convex portion, and has a length approximately equal to the thickness of the cam piece. A stopper piece is provided, and this stopper piece is temporarily attached to the inner surface of the convex portion. Then, pipe materials are inserted through these cam pieces and housed in a bulge mold, and the pipe material in all parts where the cam piece is fitted is bulged by bulge processing. This feature is characterized in that the cam piece is pressed and fixed in accordance with the shape of the inner circumferential surface of the cam piece and the rotation prevention piece.
（作 用）
カムピースはパイプ材をカムとしての厚さに相当する長
さに切断すること、およびその外周面形状をカムとして
の所定形状に成形することによって得られるので著しく
安価となり、またこのカムピースは均等肉厚でありこれ
に挿通するシャフトとしてのパイプ材のカムの凸部に対
応する部位のバルジ加工による膨出変形量が大きくなる
が、この部分は回り止めピースが埋めるのでパイプ材の
無理な膨出がなく、接部のパイプ材に割れや肉薄化を生
じることがない。(Function) The cam piece is obtained by cutting the pipe material into a length corresponding to the thickness of the cam and by molding the outer peripheral surface shape to the specified shape as the cam, so it is extremely inexpensive, and this cam piece has a uniform wall thickness, and the amount of bulge deformation due to the bulge processing of the part of the pipe material that is inserted into the shaft that corresponds to the convex part of the cam becomes large, but since this part is filled with the rotation stopper piece, the unreasonableness of the pipe material There is no bulge, and there is no cracking or thinning of the pipe material at the joint.
（実施例） 以下、本発明を図面に示す実施例を参照して説明する。(Example) The present invention will be described below with reference to embodiments shown in the drawings.
カムピース１，１．・・・は、パイプ材をカムとしての
厚さに相当する長さに切断しその外周面をカムとしての
所定形状に成形して得るもので、この成形には、長尺の
パイプ材を引抜き加工により断面カム形状に形成し、こ
れを所定長さに輪切りにして得る方法、あるいはパイプ
材を所定長さに切断したのちプレス加工によりカム形状
に成形する方法等の任意の方法を選択することができる
。こうして成形したカムピース素材の周面を、研磨、焼
入れ等の表面硬化処理を施してカムピース１とされる（
第２図）。Cam piece 1, 1. ... is obtained by cutting a pipe material into a length corresponding to the thickness of the cam and molding the outer peripheral surface into the specified shape of the cam. Select any method such as forming the cross section into a cam shape by processing and cutting it into rings to a predetermined length, or cutting the pipe material to a predetermined length and then forming it into a cam shape by press working. I can do it. The peripheral surface of the cam piece material thus formed is subjected to surface hardening treatment such as polishing and quenching to form the cam piece 1 (
Figure 2).
回り止めピース２は、例えば棒鋼材で形成されるもので
、棒鋼を引抜き加工によりその一面２ａがカムピース１
の凸部１ａの内面１ｂ形状に合致する形状に成形し、こ
れをカムピース１の厚さＴと略同長に切断して得ること
ができる（第３図）。The anti-rotation piece 2 is made of, for example, a steel bar, and one surface 2a of the bar is formed by drawing the steel bar into the cam piece 1.
It can be obtained by molding it into a shape that matches the shape of the inner surface 1b of the convex portion 1a, and cutting it into a length approximately equal to the thickness T of the cam piece 1 (FIG. 3).
このように形成した回り止めピース２の一面２ａをカム
ピース１の凸部１ａの内面１ｂに接着剤、抵抗溶接等に
より第４図示のように仮付けし、こうして回り止めピー
ス２を仮付けした所定数のカムピース１，１・・・をシ
ャフトとなるパイプ材３に嵌合し、バルジ型４内の各カ
ム型の位置にカムピース１，１・・・を納めることによ
りカムピース１゜１・・・の取付角度関係を定める。One surface 2a of the detent piece 2 thus formed is temporarily attached to the inner surface 1b of the convex portion 1a of the cam piece 1 by adhesive, resistance welding, etc., as shown in FIG. By fitting the several cam pieces 1, 1... into the pipe material 3 that becomes the shaft, and placing the cam pieces 1, 1... in the position of each cam mold in the bulge mold 4, the cam pieces 1゜1... Determine the installation angle relationship.
ついでパイプ材３の一端から圧力液体を圧入するか、あ
るいはゴムバルジによりバルジ加工を行なえば、カムピ
ース１，１．・・・が嵌合している部位のパイプ材３が
膨出して第５図示のようにカムピース１の円筒形内周面
はもとより回り止めピース２が仮付けされている凸部１
ａの内面１ｂに向は膨出して一体化される。このときカ
ムピース１の凸部１ａの内面１ｂには回り止めピース２
が仮付けされているので、パイプ材３はその回り止めピ
ース２の両側部に若干進入して膨出するのみであり、こ
のパイプ材３の膨出部３ａの変形量はきわめて僅かで回
り止めピース２を不動状態に固定し、カムピース１、回
り止めピース２、パイプ材３の三者が完全に一体化され
る。Then, by injecting pressure liquid from one end of the pipe material 3 or by performing a bulging process using a rubber bulge, the cam pieces 1, 1, . The pipe material 3 in the portion where the ... is fitted bulges out, and as shown in Figure 5, the cylindrical inner circumferential surface of the cam piece 1 as well as the convex portion 1 to which the detent piece 2 is temporarily attached are formed.
The inner surface 1b of a is bulged and integrated. At this time, a detent piece 2 is attached to the inner surface 1b of the convex portion 1a of the cam piece 1.
is temporarily attached, the pipe material 3 only slightly enters both sides of the anti-rotation piece 2 and bulges out, and the amount of deformation of the swollen portion 3a of the pipe material 3 is extremely small and prevents rotation. The piece 2 is fixed in an immovable state, and the cam piece 1, the anti-rotation piece 2, and the pipe material 3 are completely integrated.
またカムピース１の両側のパイプ材３も若干膨出するの
で、カムピース１の軸方向へのずれ動きに対しても固定
される。In addition, since the pipe members 3 on both sides of the cam piece 1 also bulge out slightly, the cam piece 1 is fixed against any displacement in the axial direction.
したがってパイプ材３の膨出量を少なくしてカムピース
１の一体化が図られるので、カムピース１．１間のパイ
プ材３の肉寄せ量も僅かですみ、カムピース１，１・・
・が固着される部分のパイプ材３の膨出部３ａに割れや
肉薄化を生じることがない。Therefore, since the cam piece 1 can be integrated by reducing the amount of bulge of the pipe material 3, the amount of thickening of the pipe material 3 between the cam pieces 1.1 is also small, and the cam pieces 1, 1...
- There is no cracking or thinning of the bulging portion 3a of the pipe material 3 in the portion to which it is fixed.
なおりムビース１の凸部１ａの内面１ｂの形状が円弧乃
至はそれに近い形状であるときは、回り止めピース２を
引抜き加工等によらず、丸鋼のまま使用することができ
る。When the shape of the inner surface 1b of the convex portion 1a of the navigator beam 1 is a circular arc or a shape close to it, the detent piece 2 can be used as a round steel without drawing or the like.
以上説明したように本発明によれば、カムピースはパイ
プ材を輪切りにしたもので得るので著しく安価となり、
またカムピースは均等肉厚であることによりシャフトと
してのパイプ材のバルジ加工による膨出量の増大はカム
ピースの凸部の内面に仮付けした回り止めピースが埋め
ることになって抑えられ、パイプ材に局部的な無理な膨
出変形を起こさせることがなく、カムピースを回り止め
して強固に固着することができる。さらにカムピースの
両側はパイプ材の肉か盛り上るのでカムピースの軸方向
へのずれ動きも生しることかないなど、安価で量産に適
し、軽量で強度の高いカムシャフトを得ることができる
効果かある。As explained above, according to the present invention, the cam piece is obtained by cutting pipe material into rounds, so it is extremely inexpensive.
In addition, since the cam piece has a uniform wall thickness, the increase in the amount of bulge due to bulging of the pipe material used as the shaft is suppressed by filling in the anti-rotation piece temporarily attached to the inner surface of the convex part of the cam piece. The cam piece can be prevented from rotating and firmly fixed without causing forced local bulging deformation. Furthermore, since the pipe material bulges on both sides of the cam piece, there is no axial movement of the cam piece, making it possible to obtain a camshaft that is inexpensive, suitable for mass production, and lightweight and strong.
第１図は本発明により得るカムシャフトの一部を示す斜
視図、第２図はパイプ材から形成したカムピースの斜視
図、第３図は棒鋼から形成した回り止めピースの斜視図
、第４図はカムピースに回り止めピースを仮付けした状
態を示す斜視図、第５図はバルジ型によりカムピースを
パイプ材に固着した状態を示す断面図である。
１・・・カムピース、１ａ・・・凸部、１ｂ・・・凸部
の内面、２・・・回り止めピース、３・・・パイプ材、
３ａ・・・膨出部、４・・・バルジ型。Fig. 1 is a perspective view showing a part of a camshaft obtained according to the present invention, Fig. 2 is a perspective view of a cam piece formed from pipe material, Fig. 3 is a perspective view of a detent piece formed from a steel bar, and Fig. 4 5 is a perspective view showing a state in which a rotation stopper piece is temporarily attached to a cam piece, and FIG. 5 is a sectional view showing a state in which the cam piece is fixed to a pipe material by a bulge type. DESCRIPTION OF SYMBOLS 1... Cam piece, 1a... Convex part, 1b... Inner surface of convex part, 2... Stopper piece, 3... Pipe material,
3a...Bulge part, 4...Bulge type.
Claims (1)
ピースを成形し、このカムピースの凸部となる部位の内
面形状に合致する断面形状に成形され前記カムピースの
厚さに略等しい長さを有する回り止めピースを設け、こ
の回り止めピースを前記凸部の内面に仮付けし、ついで
これらカムピースにパイプ材を挿通してバルジ型内に納
め、カムピース嵌合部位のパイプ材をバルジ加工により
膨出させてカムピースの内周面形状および回り止めピー
スにならって圧接固定することを特徴とするカムシャフ
トの製造方法。A cam piece whose circumferential surface has a predetermined cam shape is formed from a pipe material, and the cam piece is formed into a cross-sectional shape that matches the inner surface shape of the portion that becomes the convex portion, and has a length approximately equal to the thickness of the cam piece. A stopper piece is provided, this stopper piece is temporarily attached to the inner surface of the convex portion, and then pipe materials are inserted through these cam pieces and housed in a bulge mold, and the pipe material at the cam piece fitting portion is bulged by bulge processing. A method for manufacturing a camshaft, characterized in that the camshaft is press-fitted in accordance with the inner peripheral surface shape of the cam piece and the rotation prevention piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2182919A JPH0471729A (en) | 1990-07-11 | 1990-07-11 | Manufacture of cam shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2182919A JPH0471729A (en) | 1990-07-11 | 1990-07-11 | Manufacture of cam shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0471729A true JPH0471729A (en) | 1992-03-06 |
Family
ID=16126679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2182919A Pending JPH0471729A (en) | 1990-07-11 | 1990-07-11 | Manufacture of cam shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0471729A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002004166A1 (en) * | 2000-07-12 | 2002-01-17 | Mannesmannröhren-Werke Ag | Method for producing metallic, non-rotationally symmetrical rings with a constant wall thickness over their circumference |
| JP2003505245A (en) * | 1999-03-03 | 2003-02-12 | エス エー ゼキジシェ エレクトロネンシュトラール ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for manufacturing a camshaft and camshaft manufactured according to this method |
| JP2007513777A (en) * | 2003-12-11 | 2007-05-31 | ファインツール インターナショナル ホールディング アーゲー | Method and apparatus for manufacturing thin-walled parts |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61135434A (en) * | 1984-12-05 | 1986-06-23 | Nissan Motor Co Ltd | Production of cam shaft |
-
1990
- 1990-07-11 JP JP2182919A patent/JPH0471729A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61135434A (en) * | 1984-12-05 | 1986-06-23 | Nissan Motor Co Ltd | Production of cam shaft |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003505245A (en) * | 1999-03-03 | 2003-02-12 | エス エー ゼキジシェ エレクトロネンシュトラール ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method for manufacturing a camshaft and camshaft manufactured according to this method |
| WO2002004166A1 (en) * | 2000-07-12 | 2002-01-17 | Mannesmannröhren-Werke Ag | Method for producing metallic, non-rotationally symmetrical rings with a constant wall thickness over their circumference |
| JP2007513777A (en) * | 2003-12-11 | 2007-05-31 | ファインツール インターナショナル ホールディング アーゲー | Method and apparatus for manufacturing thin-walled parts |
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