JPS6229610Y2 - - Google Patents
Info
- Publication number
- JPS6229610Y2 JPS6229610Y2 JP1981137153U JP13715381U JPS6229610Y2 JP S6229610 Y2 JPS6229610 Y2 JP S6229610Y2 JP 1981137153 U JP1981137153 U JP 1981137153U JP 13715381 U JP13715381 U JP 13715381U JP S6229610 Y2 JPS6229610 Y2 JP S6229610Y2
- Authority
- JP
- Japan
- Prior art keywords
- cam
- cam lobe
- stem
- camshaft
- lobe
- 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
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 241000601170 Clematis lasiantha Species 0.000 claims description 2
- 239000000956 alloy Substances 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 8
- 238000005245 sintering Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000013585 weight reducing agent Substances 0.000 description 4
- 238000005219 brazing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は内燃機関の弁開閉用カムシヤフトに関
するものであり、特に異種材料によるカムシヤフ
ト構成要素を組立ててなる複合カムシヤフトに関
するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a camshaft for opening and closing valves in an internal combustion engine, and particularly to a composite camshaft formed by assembling camshaft components made of different materials.
内燃機関のカムシヤフトは高速化、軽量化の要
求により例えば(i)実公昭51−7367号の如き焼結合
金製カムロブと鋼パイプ製ステムを組合せた複合
カムシヤフトが注目されているが、さらに最も耐
摩耗性の要求されるカムノーズ部のみを別材料で
構成した例えば(ii)特開昭55−100903号や(iii)特開昭
50−78711号の如きカムロブ自体を複合カムロブ
としたカムシヤフトも提案されている。また、例
えば(iv)特開昭54.102209号の如く焼結合金を圧粉
体又は固相焼結した状態でステムに組付け、これ
を液相焼結温度で焼結することによつて焼結合金
を収縮及び元素拡散させステムと結合させる手段
がとられている。
Due to the demand for faster and lighter camshafts for internal combustion engines, composite camshafts that combine a sintered metal cam lobe and a steel pipe stem, such as (i) Utility Model Publication No. 51-7367, are attracting attention. For example, (ii) JP-A-55-100903 and (iii) JP-A-Sho where only the cam nose part, which requires abrasion resistance, is made of a different material.
A camshaft such as No. 50-78711 in which the cam lobe itself is a composite cam lobe has also been proposed. In addition, for example, (iv) as in JP-A-54-102209, a sintered alloy is assembled into a stem in a green compact or solid phase sintered state, and this is sintered at a liquid phase sintering temperature to achieve sintered bonding. Measures are taken to shrink and elementally diffuse the gold and bond it to the stem.
しかしながら、これらのカムシヤフトもそれぞ
れ欠点を有し実用化され難いものであつた。即ち
上記(i)〜(iii)においては、焼結合金製カムロブ鋼製
のステムに結合しようとした場合、かかる異種材
料は溶接性が悪いばかりでなく、適当なろう剤が
開発されていないためろう付強度も低い。さらに
焼結合金は空孔を有するため靫性が低く圧入や焼
ばめも行なえない。
However, these camshafts each have their own drawbacks and are difficult to put into practical use. In other words, in (i) to (iii) above, when trying to join a stem made of sintered alloy cam lobe steel, such dissimilar materials not only have poor weldability, but also because no suitable brazing agent has been developed. Brazing strength is also low. Furthermore, since the sintered alloy has pores, it has low toughness and cannot be press-fitted or shrink-fitted.
また、前記(iv)においては、カムロブとステムの
結合は得られるものの、カムシヤフトを組立てた
状態で焼結炉中を通す必要がありカムロブかステ
ムに対して回転及び軸方向へ位置ずれする可能性
が高いばかりか、カムシヤフト容積が大きいため
生産能率が劣り、さらに大型カムシヤフトでは焼
結加熱のためにカムシヤフトの曲がりや歪の生ず
る可能性がある。 In addition, in (iv) above, although the cam lobe and stem can be joined, it is necessary to pass the assembled camshaft through the sintering furnace, and there is a possibility that the cam lobe may become misaligned in the rotational or axial direction with respect to the stem. Not only is this high, but the camshaft has a large volume, resulting in poor production efficiency.Furthermore, in large camshafts, the camshaft may be bent or distorted due to sintering heating.
又焼結合金製カムロブ自体も最少肉厚が粉末の
圧粉成形上で限界があり、カムロブ外形の小さい
ものではそれに応じてステム径も小さくせざるを
得ず、ステム強度を維持するためステム肉厚が大
きくなり結局軽量化の効果がほとんど得られなく
なる。 In addition, the minimum wall thickness of the sintered alloy cam lobe itself has a limit when it comes to powder compaction, and if the cam lobe has a small external shape, the stem diameter must be reduced accordingly, and in order to maintain stem strength, the stem thickness must be The thickness increases, and in the end almost no weight reduction effect can be obtained.
本考案はこれら従来のカムシヤフトにおける欠
点を解決するものであり、カムロブを複合カムロ
ブとすることによつて、耐摩耗性、強度、軽量
化、組付性が同時に優れるカムシヤフトと提案し
ようとするものである。 The present invention aims to solve these drawbacks of conventional camshafts, and by making the cam lobe a composite cam lobe, we propose a camshaft that is excellent in wear resistance, strength, weight reduction, and ease of assembly at the same time. be.
上記問題点を解決するため、本考案の特徴とす
る手段は、
鋼パイプ製ステムにカムノーズのみ異種材料を
配したカムロブを組付けてなるカムシヤフトにお
いて、
前記カムロブは、ステムに接合される嵌合孔を
有する鋼製カムロブ本体とカムノーズ相当位置に
配される焼結合金製カムチツプとから形成され、
該カムチツプの断面形状は略Ｖ字形であり、前記
カムロブ本体はカムノーズと略相似形の突出部を
有し、該突出部に前記カムチツプを接合させたこ
とにある。
In order to solve the above problems, the features of the present invention are as follows: In a camshaft in which a cam lobe in which only the cam nose is made of a different material is assembled to a stem made of a steel pipe, the cam lobe has a fitting hole that is joined to the stem. It is formed from a steel cam lobe body having a
The cross-sectional shape of the cam tip is approximately V-shaped, the cam lobe main body has a protrusion having a shape substantially similar to the cam nose, and the cam tip is joined to the protrusion.
かかる本考案カムシヤフトは実施例である第１
図及び第１図のＡ−Ａ断面である第２図に示され
る。即ちカムシヤフトは鋼パイプ製のステム１に
カムロブ３、ジヤーナル４、ギア５がそれぞれ組
付けられて形成されるが、ステム１にはベルト車
９を組付ける軸端部品７とキヤツプ８が組付けら
れベルト車９によつて回転伝達される。
The camshaft of the present invention is as follows.
2, which is a cross-section taken along the line A--A in FIG. 1. That is, the camshaft is formed by assembling a cam lobe 3, a journal 4, and a gear 5 on a stem 1 made of steel pipe, and a shaft end part 7 to which a belt pulley 9 is attached and a cap 8 are attached to the stem 1. The rotation is transmitted by the belt pulley 9.
このジヤーナル４、ギア５は特別の耐摩耗性を
要求されないために鋼で形成されるが、カムロブ
３については最も耐摩耗性の要求されるカムノー
ズ３１に断面形状が略Ｖ字形の焼結合金製カムチ
ツプ６を配し、ステム１に接合される嵌合孔２０
を有する鋼製カムロブ本体２は、カムノーズと略
相似形の突出部２２を有し、該突出部に前記カム
チツプ６が接合される。 The journal 4 and the gear 5 are made of steel since no special wear resistance is required, but the cam lobe 3 is made of a sintered alloy with a substantially V-shaped cross section at the cam nose 31, which requires the most wear resistance. A fitting hole 20 in which a cam tip 6 is arranged and joined to the stem 1
The steel cam lobe main body 2 has a protrusion 22 having a shape substantially similar to the cam nose, and the cam tip 6 is joined to the protrusion.
かかる構成によりなる本考案カムシヤフトにあ
つては、まず焼結合金製カムチツプ６がカムノー
ズ３１に配されることより耐摩耗性に優れること
はもちろんであるが、比較的に肉厚が薄いステム
１との嵌合孔２０の周囲が全て鋼製のカムロブ本
体２で形成されるため、肉厚が薄くとも強度はい
ためねじれ力に充分耐えうる。従つてステム１の
径を大きくすることが可能となり、ステム１の肉
厚が薄くされ軽量化が達成される。 In the camshaft of the present invention having such a configuration, the cam tip 6 made of a sintered metal is disposed on the cam nose 31, which of course provides excellent wear resistance, and the stem 1 has a relatively thin wall thickness. Since the entire periphery of the fitting hole 20 is formed by the cam lobe main body 2 made of steel, the cam lobe main body 2 is strong enough to withstand twisting force even though the wall thickness is thin. Therefore, the diameter of the stem 1 can be increased, the wall thickness of the stem 1 can be reduced, and weight reduction can be achieved.
一方カムチツプ６とカムロブ本体２との結合は
カムチツプ６を粉未圧粉体の状態でカムロブ本体
２と組付けて後一体的に焼結することによつてカ
ムチツプ６の焼結と、カムロブ本体との結合が達
成される。この際にカムロブ本体との結合を充分
に得るため、本出願人の先に提案した特開昭55−
113805号の如き焼結合金及び方法が用いられるこ
とが望ましい。即ち焼結合金としては、重量％で
C0.5〜7.0％、（Ｐ，Ｂ，Si）のうち一種又は二種
以上を0.1〜7.0％，Cr8.0〜30.0％を含む鉄系焼結
合金を液相焼結させることが好ましい。 On the other hand, the connection between the cam chip 6 and the cam lobe body 2 is achieved by assembling the cam chip 6 with the cam lobe body 2 in an unpressed powder state and then sintering the cam chip 6 and the cam lobe body 2 together. The combination of is achieved. At this time, in order to obtain sufficient connection with the cam lobe body, the present applicant proposed the
Preferably, a sintered alloy and method such as that of No. 113805 is used. In other words, as a sintered alloy, in weight%
It is preferable to carry out liquid phase sintering of an iron-based sintered alloy containing 0.5 to 7.0% of C, 0.1 to 7.0% of one or more of (P, B, and Si), and 8.0 to 30.0% of Cr.
かかる粉未圧粉体と鋼とを組付けて一体的に焼
結した場合に、約６％の収縮が発生するため圧粉
体形状はその分大きく形成される。また第２図に
示す如くカムチツプ６の形状を断面がほぼＶ字形
とし、カムロブ本体２にカムノーズ３１とほぼ相
似した突出部２２を形成することによりカムチツ
プ６の容積を低減すると同時に突出部２１がカム
チツプ６との接合面積を増す効果と、ねじり力に
対する補強の効果を発揮するばかりでなく、カム
チツプ６自体の肉厚も均一となるため焼結収縮に
よるカムチツプ形状の歪を低減することが可能と
なる。 When such an uncompacted powder body and steel are assembled and sintered integrally, a shrinkage of about 6% occurs, so the shape of the compacted body is formed to be correspondingly larger. Further, as shown in FIG. 2, the cam tip 6 has a substantially V-shaped cross section, and the cam lobe main body 2 is provided with a protrusion 22 that is substantially similar to the cam nose 31, thereby reducing the volume of the cam tip 6 and at the same time making the protrusion 21 more similar to the cam tip. Not only does this have the effect of increasing the bonding area with the cam chip 6 and the effect of reinforcing against torsional force, but also the thickness of the cam chip 6 itself becomes uniform, making it possible to reduce distortion of the cam chip shape due to sintering shrinkage. .
次に本考案ではステム１と結合する部分が鋼製
のカムロブ本体２であるためステム１とカムロブ
３との結合が容易である。即ちステム１とカムロ
ブ本体２が同種材料であるため溶接性及びろう付
性に優れるばかりでなく、カムロブ３自体が鋼製
カムロブ本体２が靫性に優れる鋼であるため圧入
や焼入による結合でも充分な結合が得られる。 Next, in the present invention, since the portion to be connected to the stem 1 is the cam lobe main body 2 made of steel, the stem 1 and the cam lobe 3 can be easily connected. In other words, since the stem 1 and the cam lobe body 2 are made of the same material, they not only have excellent weldability and brazeability, but also the cam lobe 3 itself is made of steel.The cam lobe body 2 is made of steel with excellent brazing properties, so it can be joined by press fitting or quenching. Sufficient bonding is obtained.
以上に述べたように、本考案のカムシヤフトに
あつては、従来のカムシヤフトにおける欠点を解
決し、耐摩耗性、強度、軽量化、組付性に優れる
という効果が得られる。
As described above, the camshaft of the present invention solves the drawbacks of conventional camshafts, and provides excellent wear resistance, strength, weight reduction, and ease of assembly.
第１図：本考案カムシヤフト実施例断面図、第
２図：第１図Ａ−Ａ断面図。
符号の説明、１：ステム、２：カムロブ本体、
２０：カムロブ本体嵌合孔、２２：突出部、３：
カムロブ、３１：カムノーズ、４：ジヤーナル、
５：ギア、６：カムチツプ。
Fig. 1: A sectional view of an embodiment of the camshaft of the present invention, Fig. 2: A sectional view taken along line A-A in Fig. 1. Explanation of symbols, 1: Stem, 2: Cam lobe body,
20: Cam lobe body fitting hole, 22: Projection, 3:
Cam Rob, 31: Cam Nose, 4: Journal,
5: Gear, 6: Camchip.
Claims (1)
配したカムロブを組付けてなるカムシヤフトにお
いて、 前記カムロブは、ステムに接合される嵌合孔を
有する鋼製カムロブ本体とカムノーズ相当位置に
配される焼結合金製カムチツプとから形成され、
該カムチツプの断面形状は略Ｖ字形であり、前記
カムロブ本体はカムノーズと略相似形の突出部を
有し、該突出部に前記カムチツプが接合されてな
ることを特徴とするカムシヤフト。[Scope of Claim for Utility Model Registration] In a camshaft in which a cam lobe in which only the cam nose is made of a different material is assembled to a steel pipe stem, the cam lobe is equivalent to a steel cam lobe body having a fitting hole to be joined to the stem and a cam nose. It is formed from a sintered metal cam chip placed at the position,
A camshaft characterized in that the cross-sectional shape of the cam tip is approximately V-shaped, the cam lobe main body has a protrusion having a shape substantially similar to the cam nose, and the cam tip is joined to the protrusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13715381U JPS5842306U (en) | 1981-09-17 | 1981-09-17 | camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13715381U JPS5842306U (en) | 1981-09-17 | 1981-09-17 | camshaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5842306U JPS5842306U (en) | 1983-03-22 |
| JPS6229610Y2 true JPS6229610Y2 (en) | 1987-07-30 |
Family
ID=29930446
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13715381U Granted JPS5842306U (en) | 1981-09-17 | 1981-09-17 | camshaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5842306U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6058922U (en) * | 1983-09-28 | 1985-04-24 | 日本ピストンリング株式会社 | shaft member |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5084712A (en) * | 1973-12-05 | 1975-07-08 | ||
| JPS54102209A (en) * | 1978-01-31 | 1979-08-11 | Toyota Motor Corp | Joining method for shaft member with its fitting member |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS517366Y2 (en) * | 1971-06-05 | 1976-02-28 |
-
1981
- 1981-09-17 JP JP13715381U patent/JPS5842306U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5084712A (en) * | 1973-12-05 | 1975-07-08 | ||
| JPS54102209A (en) * | 1978-01-31 | 1979-08-11 | Toyota Motor Corp | Joining method for shaft member with its fitting member |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5842306U (en) | 1983-03-22 |
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