JPS6132081Y2 - - Google Patents
Info
- Publication number
- JPS6132081Y2 JPS6132081Y2 JP13094881U JP13094881U JPS6132081Y2 JP S6132081 Y2 JPS6132081 Y2 JP S6132081Y2 JP 13094881 U JP13094881 U JP 13094881U JP 13094881 U JP13094881 U JP 13094881U JP S6132081 Y2 JPS6132081 Y2 JP S6132081Y2
- Authority
- JP
- Japan
- Prior art keywords
- cam lobe
- sleeve
- flange
- camshaft
- cam
- 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
- 239000010959 steel Substances 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 238000005245 sintering Methods 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000007791 liquid phase Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 241000601170 Clematis lasiantha Species 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
- Powder Metallurgy (AREA)
Description
【考案の詳細な説明】
本考案は内燃機関の吸排気弁開閉用カムシヤフ
トに関するものである。[Detailed Description of the Invention] The present invention relates to a camshaft for opening and closing intake and exhaust valves of an internal combustion engine.
カムシヤフトにはカムフオロワーとの摺動面を
形成すカム部に特別の耐摩耗性を要求されるばか
りでなく、軸部材としての曲げ、ねじり、疲労強
度を要する。従来のカムシヤフトとして、鋳鉄又
は鋼製カムシヤフトが一般的であつたが、鋳鉄カ
ムシヤフトでは長尺のカムシヤフトを生産しよう
とした場合の曲がり、歪、割れの発生があるばか
りか強度上問題より重量が大きくなるものであ
り、一方鋼性カムシヤフトは耐摩耗性が得られな
いものであつた。 A camshaft not only requires special wear resistance for the cam portion that forms the sliding surface with the cam follower, but also requires bending, torsion, and fatigue strength as a shaft member. Conventional camshafts have generally been made of cast iron or steel, but cast iron camshafts not only tend to bend, distort, and crack when trying to produce long camshafts, but also have problems with strength due to their weight. On the other hand, steel camshafts did not provide good wear resistance.
これに対して軽量であり耐摩耗性、強度共に優
れたものとして例えば実公昭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
カムシヤフトが注目されている。かかる焼結合金
と鋼との複合カムシヤフトは、特開昭54−102209
号の如く、焼結合金の収縮性と拡散結合を利用し
てカムロブとステムを結合するものや、特開昭54
−126853号の如く、ろう付によるもの、あるいは
実開昭48−9804号の如き溶接によるものがある
が、いずれもそれぞれの欠陥がある。 On the other hand, a camshaft which combines a sintered metal cam lobe and a steel pipe stem, such as the one disclosed in Japanese Utility Model Publication No. 51-7367, is attracting attention as it is lightweight and has excellent wear resistance and strength. Such a composite camshaft made of sintered alloy and steel is disclosed in Japanese Patent Application Laid-Open No. 102209-1983.
As shown in the issue, there is a method that connects a cam lobe and a stem using the shrinkage of sintered alloy and diffusion bonding, and
There are methods using brazing as in No.-126853, and methods using welding as in Utility Model Application No. 1988-9804, but each method has its own flaws.
まず焼結合金製カムロブは高面圧荷重に耐える
必要があるため、空孔量を下げ密度を高くせねば
ならない。そのためには焼結鍛造を行うか、ある
いは液相焼結を行うかの方法がとられるものであ
るが、焼結鍛造は特別な設備を要するばかりか、
ステムとの嵌合孔を加工せねばならず生産性に劣
るものである。一方液相焼結により高密度化しよ
うとした場合に収縮率が10％前後となるためステ
ムへの組付に特別の注意を要し、かつ焼結炉又は
誘導焼結装置内へ組付後のカムシヤフトをセツト
し焼結温度（通常1250℃前後）まで加熱するた
め、ステムの熱変形や、焼結に伴うカムロブの位
置ずれを発生し易く、生産安定性に欠けるもので
あつた。 First, sintered metal cam lobes must withstand high surface pressure loads, so the number of pores must be reduced and the density must be increased. To achieve this, sinter forging or liquid phase sintering is used, but sinter forging not only requires special equipment;
A hole for fitting the stem must be machined, resulting in poor productivity. On the other hand, when attempting to achieve high density through liquid phase sintering, the shrinkage rate is around 10%, so special care must be taken when assembling to the stem, and after assembling into the sintering furnace or induction sintering device. Since the camshaft is set and heated to the sintering temperature (usually around 1250°C), thermal deformation of the stem and misalignment of the cam lobe due to sintering are likely to occur, resulting in a lack of production stability.
さらに液相焼結を行なう場合に、炉中にて圧粉
体がわずかでも接していると接触面が強固に結合
してしまうため、圧粉体をなんらかの方法で仕切
る必要があつたが、この仕切り治具の容積が大き
いばかりか、仕切り治具と圧粉体をセツトする工
程が手作業によらざるをえず生産性に劣るもので
あつた。 Furthermore, when performing liquid-phase sintering, if the powder compacts are in even the slightest contact in the furnace, the contact surfaces will be strongly bonded, so it was necessary to partition the compacts in some way. Not only does the partitioning jig have a large volume, but the process of setting the partitioning jig and the green compact must be done manually, resulting in poor productivity.
本考案はこれらの従来の問題を解決するもので
あり、焼結合金製カムロブを焼結合金と鋼との複
合カムロブとし、さらに鋼部材に改良を加えて生
産性を著しく向上し、かつ結合強度及び生産安定
性に優れたカムシヤフトを得るものである。 The present invention solves these conventional problems by replacing the sintered metal cam lobe with a composite cam lobe of sintered metal and steel, and further improves the steel components to significantly improve productivity and increase the bonding strength. and a camshaft with excellent production stability.
まず本考案の要旨とするところは下記３つの構
成要件によりなるカムシヤフトにある。 First, the gist of the present invention lies in a camshaft that has the following three constituent elements.
(1) カムロブが中空部３０を有する焼結合金製カ
ムロブ３と中空部３０に嵌合されるスリーブ２
とによりなること。(1) A sintered metal cam lobe 3 having a hollow portion 30 and a sleeve 2 fitted into the hollow portion 30
To be caused by
(2) スリーブ２がカムロブ本体３の少なくとも軸
方向の一側面と当接するフランジ２２が形成さ
れること。(2) A flange 22 is formed so that the sleeve 2 comes into contact with at least one side of the cam lobe body 3 in the axial direction.
(3) スリーブ２の内周面がステム１と結合される
こと。(3) The inner peripheral surface of the sleeve 2 is coupled to the stem 1.
かかる本考案のカムシヤフトは第１図及び第１
図のＡ−Ａ断面である第２図、第１図の要部拡大
図である第３図に示すように、鋼パイプによるス
テム１にジヤーナル４、ギア５、カムロブが組付
けられて形成される。ステム１の軸端にはキヤツ
プ８及びプーリ９を結合するブツシユ７が結合さ
れており、カムロブはカムロブ本体３とスリーブ
２によつて形成される。 Such a camshaft of the present invention is shown in FIGS.
As shown in FIG. 2, which is a cross section taken along line A-A in the figure, and FIG. 3, which is an enlarged view of the main part of FIG. Ru. A bush 7 for connecting a cap 8 and a pulley 9 is connected to the shaft end of the stem 1, and a cam lobe is formed by a cam lobe body 3 and a sleeve 2.
このカムロブはカムロブ本体３とスリーブ２と
を予め結合して用意されるが結合方法はスリーブ
２にカムロブ本体の焼結合金の粉末圧粉体を組付
け炉中で組立体を液相焼結して得られる。従つて
スリーブ２とカムロブ本体とはカムロブ本体自体
の液相焼結に伴う収縮と拡散結合により極めて強
く結合されることとなる。この際に従来にあつて
はカムロブを特殊治具で仕切る必要があつたが本
考案カムロブにおいては極めて容易にカムロブを
セツトすることが可能である。 This cam lobe is prepared by joining the cam lobe body 3 and the sleeve 2 in advance, but the joining method is assembling a powder compact of the sintered alloy of the cam lobe body to the sleeve 2 and liquid-phase sintering the assembly in a furnace. can be obtained. Therefore, the sleeve 2 and the cam lobe body are extremely strongly bonded by shrinkage and diffusion bonding caused by the liquid phase sintering of the cam lobe body itself. In this case, conventionally it was necessary to partition the cam lobe with a special jig, but with the cam lobe of the present invention, it is possible to set the cam lobe extremely easily.
即ち第３図に示す如くカムロブ本体３の軸方向
の一側面に当接するフランジ２２をスリーブ２に
形成するため第４図に示す如く焼結する際にカム
ロブ本体３同志が接触することが防がれるもので
ある。具体的には焼結トレイ１１に固定された棒
１０にスリーブ２とカムロブ本体３の組付体を積
層するが、この際にスリーブ２のフランジ２２に
支承されてカムロブ本体は垂直方向に位置固定さ
れており、さらにスリーブ２の軸端２３同志によ
つてカムロブ本体３同志が接触することが防がれ
る。この場合に第４図に図示する如くフランジ２
２を設けた側の逆のスリーブ端をカムロブ本体３
より突出させることが望ましいが第５図に図示す
る如く、フランジ２２側の軸端２３を突出させて
もかまわない。 That is, as shown in FIG. 3, since the sleeve 2 is provided with a flange 22 that abuts one side of the cam lobe body 3 in the axial direction, the cam lobe bodies 3 are prevented from coming into contact with each other during sintering as shown in FIG. It is something that can be done. Specifically, the assembly of the sleeve 2 and the cam lobe body 3 is stacked on the rod 10 fixed to the sintering tray 11. At this time, the cam lobe body is supported by the flange 22 of the sleeve 2 and fixed in position in the vertical direction. Furthermore, the shaft ends 23 of the sleeve 2 prevent the cam lobe bodies 3 from coming into contact with each other. In this case, as shown in FIG.
Attach the opposite end of the sleeve to the cam lobe body 3.
Although it is desirable that the shaft end 23 protrude further, the shaft end 23 on the flange 22 side may be made to protrude as shown in FIG.
さらに第６図に示す如くカムロブ本体３の両側
にフランジ２２を形成することも可能である。 Furthermore, it is also possible to form flanges 22 on both sides of the cam lobe body 3 as shown in FIG.
尚スリーブ２にフランジ２２を形成する方法と
しては、スリーブ２をプレス成形することによつ
ても成形されるがフランジ２２を円筒状のスリー
ブ２に固着することによつても可能であることは
いうまでもない。 The flange 22 can be formed on the sleeve 2 by press-molding the sleeve 2, but it is also possible to fix the flange 22 to the cylindrical sleeve 2. Not even.
又カムロブ本体の圧粉体とスリーブ２のフラン
ジ２２の位置を固定するため、第７図に示す如く
カムロブ本体３に凹部３４を設け、この凹部３４
と対応する凸部２４をスリーブ２に設けることに
よりスリーブ２とカムロブ本体３の回り止めがな
される。尚このカムロブ本体に設ける凹部３４の
形状をフランジ２２の形状とし、フランジ自体に
凸部２４の効果を持たせることも可能である。 In addition, in order to fix the position of the powder compact of the cam lobe body and the flange 22 of the sleeve 2, a recess 34 is provided in the cam lobe body 3 as shown in FIG.
By providing the sleeve 2 with a corresponding convex portion 24, rotation of the sleeve 2 and the cam lobe body 3 is prevented. It is also possible to make the shape of the recess 34 provided in the cam lobe body the same as the shape of the flange 22 so that the flange itself has the effect of the protrusion 24.
以上記した如く本考案のカムロブはスリーブ２
にフランジ２４を有することによつてカムロブの
製造上極めて容易に生産されうるものであるが、
さらに靭性が比較的小さい焼結合金に対して鋼製
のスリーブのフランジが補強効果を発揮するもの
であつて、第８図に示す如きテーパカムロブを有
するカムシヤフトにあつては軸方向のスラスト力
を受けるものとしてフランジ２２の効果は大きい
ものである。 As mentioned above, the cam lob of this invention has sleeve 2.
By having the flange 24 on the cam lobe, it is possible to manufacture the cam lobe extremely easily.
Furthermore, the flange of the steel sleeve exerts a reinforcing effect on the sintered alloy, which has relatively low toughness, and in the case of a camshaft having a tapered cam lobe as shown in Fig. 8, it receives thrust force in the axial direction. As such, the effect of the flange 22 is great.
さらに本考案カムシヤフトにおいてはスリーブ
２とステム１とが共に鋼であり、同種材料である
ため、溶接やろう付性がよく特に溶接する場合に
あつてはスリーブの突出部２３及びフランジ２２
とステムが溶接されることとなるために焼結合金
製のカムロブ本体３へ溶接影響が及びにくく、溶
接に際しての特別な注意が不要となるものであ
る。又靭性の小さい焼結合金では圧入、焼ばめに
よる結合強度が得難いものであつたが本考案では
ステムと結合するに鋼製のスリーブを配している
ため圧入、焼ばめに対しても充分な結合強度が得
られるものである。 Furthermore, in the camshaft of the present invention, the sleeve 2 and the stem 1 are both made of steel and are made of the same material, so that they have good welding and brazing properties, especially when welding.
Since the stem is welded to the cam lobe main body 3 made of a sintered alloy, welding is less likely to affect the cam lobe main body 3, and special precautions are not required during welding. In addition, with sintered alloys having low toughness, it is difficult to obtain bonding strength by press fitting or shrink fitting, but in this invention, a steel sleeve is placed to connect to the stem, so it is difficult to obtain bonding strength by press fitting or shrink fitting. Sufficient bonding strength can be obtained.
尚本考案カムロブにおいては多数のカムロブを
積層する場合にスリーブ端の突出部は必要となる
が、第９図に示す如く２つのカムロブを重ねて焼
結する場合にはフランジ２２同志をあわせること
によりカムロブ同志の結合は防がれるためにスリ
ーブ軸端に突出部２３を設ける必要はない。 In the cam lobe of the present invention, a protrusion at the end of the sleeve is necessary when a large number of cam lobes are stacked, but when two cam lobes are overlapped and sintered as shown in FIG. Since coupling of the cam lobes to each other is prevented, it is not necessary to provide the protrusion 23 at the end of the sleeve shaft.
又本考案におけるフランジ２２はスリーブ端を
抜管加工やしぼり加工又は切削加工されてもよい
が、第１０図に示す如くスリーブ２の一部を塑性
加工し、フランジ２２と突出する軸端部２を同時
に形成されても良い。 Further, the flange 22 in the present invention may be formed by extruding, squeezing, or cutting the sleeve end, but as shown in FIG. They may be formed simultaneously.
又カムロブ本体の焼結合金肉厚は粉末成形の限
界より最低0.5mm程度は要するが、カムロブ自体
のねじり強度上肉厚最少厚さは1.0mm程度を要す
る。 In addition, the thickness of the sintered alloy of the cam lobe body must be at least 0.5 mm due to the limit of powder molding, but the minimum thickness of the cam lobe itself is approximately 1.0 mm due to the torsional strength of the cam lobe itself.
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、第３図：第１図要部
拡大断面図、第４図：第９図：本考案の製造状態
を示す断面図、第５図〜第８図：第１０図：本考
案の他の実施例断面図。
符号の説明、１：ステム、２：スリーブ、２
２：フランジ、２３：スリーブ軸端、３：カムロ
ブ本体、３０：カムロブ中空部。
Figure 1: Cross-sectional view of an embodiment of the camshaft of the present invention, Figure 2: Cross-sectional view taken along line A-A in Figure 1, Figure 3: Enlarged cross-sectional view of main parts of Figure 1, Figure 4: Figure 9: Manufacturing of the present invention. Sectional views showing the state, FIGS. 5 to 8: FIG. 10: Sectional views of other embodiments of the present invention. Explanation of symbols, 1: Stem, 2: Sleeve, 2
2: Flange, 23: Sleeve shaft end, 3: Cam lobe body, 30: Cam lobe hollow part.
Claims (1)
るカムシヤフトにおいて、前記カムロブが、中
空部３０を有する焼結合金製カムロブ本体３
と、該カムロブ本体の中空部３０に嵌合される
スリーブ２とにより形成され、該スリーブ２に
前記カムロブ本体３の少なくとも軸方向の一側
面と当接するフランジ２２が形成され、かつス
リーブ２の内周面がステム１と結合されてなる
ことを特徴とするカムシヤフト。 (2) 前記スリーブ２に前記カムロブの軸方向の一
側面と当接するフランジ２２を設けると共に、
スリーブ２の軸方向の少なくとも一方の端部２
３をカムロブ本体３より軸方向に突出させたこ
とを特徴とする前記実用新案登録請求の範囲第
１項記載のカムシヤフト。 (3) 前記スリーブ２に設けたフランジ２２にカム
ロブ本体３に設けた凹部３４に対応する凸部２
４を設けたことを特徴とする前記実用新案登録
請求の範囲第１項記載のカムシヤフト。[Claims for Utility Model Registration] (1) In a camshaft in which a sintered metal cam log is assembled to a steel pipe, the cam lobe has a sintered metal cam lobe body 3 having a hollow portion 30.
and a sleeve 2 fitted into the hollow portion 30 of the cam lobe body, the sleeve 2 is formed with a flange 22 that abuts at least one side of the cam lobe body 3 in the axial direction, and A camshaft characterized in that a peripheral surface is connected to a stem 1. (2) The sleeve 2 is provided with a flange 22 that comes into contact with one side of the cam lobe in the axial direction, and
At least one end 2 in the axial direction of the sleeve 2
3. The camshaft according to claim 1, wherein the cam lobe body 3 projects from the cam lobe body 3 in the axial direction. (3) A convex portion 2 corresponding to the concave portion 34 provided on the cam lobe body 3 on the flange 22 provided on the sleeve 2
4. The camshaft according to claim 1, further comprising: 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13094881U JPS5837903U (en) | 1981-09-04 | 1981-09-04 | camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13094881U JPS5837903U (en) | 1981-09-04 | 1981-09-04 | camshaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5837903U JPS5837903U (en) | 1983-03-11 |
| JPS6132081Y2 true JPS6132081Y2 (en) | 1986-09-18 |
Family
ID=29924550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13094881U Granted JPS5837903U (en) | 1981-09-04 | 1981-09-04 | camshaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5837903U (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 |
-
1981
- 1981-09-04 JP JP13094881U patent/JPS5837903U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5837903U (en) | 1983-03-11 |
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