JPS6246803Y2 - - Google Patents
Info
- Publication number
- JPS6246803Y2 JPS6246803Y2 JP1981137155U JP13715581U JPS6246803Y2 JP S6246803 Y2 JPS6246803 Y2 JP S6246803Y2 JP 1981137155 U JP1981137155 U JP 1981137155U JP 13715581 U JP13715581 U JP 13715581U JP S6246803 Y2 JPS6246803 Y2 JP S6246803Y2
- Authority
- JP
- Japan
- Prior art keywords
- cam lobe
- camshaft
- stem
- protrusion
- hollow hole
- 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
- 239000002184 metal Substances 0.000 claims description 17
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 239000011796 hollow space material Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 description 24
- 229910045601 alloy Inorganic materials 0.000 description 20
- 239000000956 alloy Substances 0.000 description 20
- 238000005266 casting Methods 0.000 description 9
- 239000002131 composite material Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000005056 compaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000013585 weight reducing agent Substances 0.000 description 3
- 229910021364 Al-Si alloy Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910001234 light alloy Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000009702 powder compression Methods 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Description
【考案の詳細な説明】
本考案は内燃機関用カムシヤフトに関するもの
であり、特にカムロブ、ジヤーナル、ステムなど
の構成部品に異種材料を用いた複合カムシヤフト
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a camshaft for an internal combustion engine, and more particularly to a composite camshaft in which components such as a cam lobe, journal, and stem are made of different materials.
カムシヤフトにはチルド鋳物又は焼入鋳物、浸
炭焼入鋼が用いられていたが、近年の内燃機関の
要求を満足するものではない。即ち高速化高出力
化、軽量化が内燃機関に要求されるにあつて、鋳
鉄カムシヤフトでは重量が低減されないばかり
か、大型カムシヤフトでの曲がりや歪が防ぎ得
ず、鋼製カムシヤフトでは耐摩耗性が得られな
い。そこでカムシヤフトを構成するカムロブ、ジ
ヤーナル、ステムなどの構成部品をその使用目的
に応じた材料を用いて組立てた複合カムシヤフト
が注目されている。 Chilled castings, hardened castings, and carburized hardened steel have been used for camshafts, but these do not satisfy the demands of modern internal combustion engines. In other words, as internal combustion engines are required to be faster, have higher output, and be lighter, cast iron camshafts not only do not reduce weight, but large camshafts cannot prevent bending and distortion, and steel camshafts have poor wear resistance. I can't get it. Therefore, composite camshafts are attracting attention, in which components such as cam lobes, journals, and stems that make up the camshaft are assembled using materials appropriate for the purpose of use.
この複合カムシヤフトにはステムを鋼パイプと
して、ステムにカムロブやジヤーナルを溶接、ろ
う付、焼結拡散結合させたような組立型の複合カ
ムシヤフトと、カムロブやジヤーナルをステムを
構成する金属溶湯で鋳包むか、又はステムをカム
ロブやジヤーナルを構成する金属溶湯で鋳包むか
の鋳包み型複合カムシヤフトがある。 This composite camshaft includes an assembled composite camshaft in which the stem is a steel pipe and the cam lobe and journal are welded, brazed, or sintered and diffusion bonded to the stem, and the cam lobe and journal are cast in the molten metal that makes up the stem. Alternatively, there is a cast-in type composite camshaft in which the stem is cast in the molten metal that constitutes the cam lobe and journal.
一方カムロブは成形性と耐摩耗性の見地から焼
結合金が用いられるが、カムシヤフトの如く高面
圧を受ける摺動部材にあつては高密度の焼結合金
とし面圧強度を高くする必要がある。従つて添加
元素の選択性が広く耐摩耗性に優れかつ密度を高
くしうる液相焼結合金が最も適している。 On the other hand, a sintered alloy is used for the cam lobe from the viewpoint of formability and wear resistance, but for sliding members such as camshafts that are subject to high surface pressure, it is necessary to use a high-density sintered alloy to increase the surface pressure strength. be. Therefore, liquid phase sintered alloys with a wide selectivity of additive elements, excellent wear resistance and high density are most suitable.
かかる液相焼結合金製のカムロブは焼結合金で
ある理由によつて複合カムシヤフトに使用する場
合様々な制約がある。まず焼結合金が粉末圧粉体
より形成されることによつてその最少の肉厚に制
限があり、カムロブ中央の孔に鋼パイプを組付け
る組立型複合カムシヤフトではステム外径がカム
ロブ肉厚分小さくなり、強度上ステム肉厚を厚く
せねばならず、軽量化の効果が小さいばかりか、
カムロブ自体がねじれによる割れを生じ易いため
ステムとの結合力をより強くするか、又はカムロ
ブ肉厚を増す手段しかとりえない。 Cam lobes made of liquid phase sintered alloys have various restrictions when used in composite camshafts because they are sintered alloys. First, because the sintered alloy is formed from a compacted powder, there is a limit to its minimum wall thickness.In an assembled composite camshaft in which a steel pipe is assembled into the hole in the center of the cam lobe, the outer diameter of the stem is equal to the thickness of the cam lobe. As it becomes smaller, the stem must be thicker for strength reasons, and the effect of weight reduction is not only small, but also
Since the cam lobe itself tends to crack due to twisting, the only options available are to strengthen the bonding force with the stem or increase the thickness of the cam lobe.
これに対して焼結合金製カムロブを金属溶湯で
鋳包もうとした場合に、焼結合金空孔に存在する
酸化膜が治金学的結合を阻害するばかりか、軽量
化のためAl又はAl合金で鋳包む際には鉄系合金
である焼結合金製カムロブとステムとは治金学的
には全く結合せず、結合強度が著しく弱い。従つ
て例えば特開昭50−79616号にも示される如く、
湯通路と中子嵌合孔を設けて回り止めと鋳包み性
を与えるものがあるが、かかる湯通路や中子嵌合
孔を設けることは前述した如く焼結合金の粉末成
形上の肉厚の制限があることや、一般に高密度で
空孔の存在する焼結合金の被削性の悪さに基づく
加工困難性、及び焼結合金強度の問題より実用さ
れ難いものであつた。 On the other hand, when trying to cast a cam lobe made of sintered alloy with molten metal, the oxide film existing in the sintered alloy pores not only inhibits metallurgical bonding, but also When casting with an alloy, the cam lobe made of a sintered alloy, which is an iron-based alloy, and the stem are not metallurgically bonded at all, and the bonding strength is extremely weak. Therefore, for example, as shown in Japanese Patent Application Laid-open No. 50-79616,
Some products have hot water passages and core fitting holes to prevent rotation and provide cast-in properties, but as mentioned above, providing such hot water passages and core fitting holes is difficult due to the thickness of the powder molded sintered alloy. It has been difficult to put this method into practical use due to limitations, processing difficulties due to the poor machinability of sintered alloys that generally have high densities and pores, and problems with the strength of sintered alloys.
本考案はかかる鋳包み型の複合カムシヤフトに
あつて、充分な鋳包み強度及び、焼結合金自体の
強度を有し、かつ生産性に優れたカムシヤフトを
提供するものであり、以下詳細に説明する。 The present invention provides such a cast-in type composite camshaft that has sufficient cast-in strength and the strength of the sintered alloy itself, and has excellent productivity, and will be described in detail below. .
まず本考案の要旨とするところは登録請求の範
囲に記載した如く下記３つの構成によりなるカム
シヤフトにある。 First, the gist of the present invention is a camshaft having the following three configurations as described in the claims.
(1) 焼結合金製カムロブがステムを形成する金属
溶湯によつて鋳包まれてなること。(1) A sintered metal cam lobe is cast in the molten metal that forms the stem.
(2) 焼結合金製カムロブは、軸方向に貫通する中
空孔を有すること。(2) The sintered metal cam lobe shall have a hollow hole passing through it in the axial direction.
(3) 中空孔の周囲には焼結合金製カムロブの軸方
向幅よりも軸方向に突出する突出部を設けるこ
と。(3) Provide a protrusion around the hollow hole that protrudes in the axial direction beyond the axial width of the sintered metal cam lobe.
かかる本考案カムシヤフトを第１図及び第１図
Ａ−Ａ断面である第２図、第１図要部拡大図であ
る第３図に示す実施例に従い説明する。 The camshaft of the present invention will be described with reference to an embodiment shown in FIG. 1, FIG. 2 which is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 which is an enlarged view of the main part of FIG.
カムシヤフトはステム１とカムロブ３・３−ジ
ヤーナル４、ギア５、及び油孔を形成する中空パ
イプ７によつて形成されており、軸端に組付けた
ベルト車９によつてクランク軸より回転伝達され
る。一方カムロブ３は焼結合金で製造されてお
り、中央に湯通路となる中空孔３０が設けられ、
中空孔３０周囲には焼結合金製カムロブの軸方向
幅よりも軸方向に突出した突出部３２が設けられ
る。 The camshaft is formed by a stem 1, cam lobes 3 and 3, a journal 4, a gear 5, and a hollow pipe 7 that forms an oil hole, and the rotation is transmitted from the crankshaft by a belt pulley 9 attached to the shaft end. be done. On the other hand, the cam lobe 3 is made of sintered alloy, and has a hollow hole 30 in the center that serves as a hot water passage.
A protrusion 32 is provided around the hollow hole 30 and protrudes in the axial direction beyond the axial width of the sintered metal cam lobe.
カムシヤフトを製造する場合に鋳型内に予めカ
ムロブ３、ジヤーナル４、ギア５、中空パイプ７
がセツトされ、ステム１を形成する金属溶湯が注
湯されるが、カムロブ３の中空孔３０がこの金属
溶湯の湯通路となり、突出部３２によつてカムロ
ブ３が強固に鋳包まれることとなる。 When manufacturing a camshaft, the cam lobe 3, journal 4, gear 5, and hollow pipe 7 are placed in the mold in advance.
is set, and the molten metal forming the stem 1 is poured. The hollow hole 30 of the cam lobe 3 becomes a passage for this molten metal, and the cam lobe 3 is firmly encapsulated by the protrusion 32. .
即ち軽量化の手段としてAl又はAl合金をもつ
て鋳包もうとした場合に単に中空孔３０のみを有
するカムロブではAl合金の収縮と液相焼結され
た高密度の焼結合金間にある収縮量の差によつて
中空孔３０周囲にひけが生じる可能性が高いもの
であり、一方中空孔３０を四角又は鋳包み用凹凸
を付けた複雑な形状としても焼結合金の強度が低
下するのみであり、鋳包み強度の向上は得難い。
これに対して突出部３２を設けたことにより、ス
テム１にカムロブ３側面に突出する鋳包み突起１
２が形成され、中空孔３０側と鋳包み突起１２と
により突出部３２が鋳包まれるため、完全な結合
が達成される。 In other words, when casting with Al or an Al alloy as a means of weight reduction, in a cam lobe that simply has a hollow hole 30, the shrinkage of the Al alloy and the shrinkage between the high-density sintered alloy subjected to liquid phase sintering occur. There is a high possibility that sink marks will occur around the hollow hole 30 due to the difference in the amount, and on the other hand, even if the hollow hole 30 is square or has a complicated shape with irregularities for casting, the strength of the sintered alloy will only decrease. Therefore, it is difficult to improve the cast-in strength.
On the other hand, by providing the protrusion 32, the cast-in protrusion 1 protrudes from the side surface of the cam lobe 3 on the stem 1.
2 is formed, and the protrusion 32 is cast-in by the hollow hole 30 side and the cast-in protrusion 12, so that a complete connection is achieved.
しかもカムロブ３は中央に中空孔３０を有する
のみであつてその肉厚を半径方向に厚くしてもス
テム１外径を大きくすることが可能であり、ステ
ム１の強度及びカムロブ３の強度が共に得られ
る。 Moreover, since the cam lobe 3 only has a hollow hole 30 in the center, the outer diameter of the stem 1 can be increased even if its wall thickness is increased in the radial direction, so that both the strength of the stem 1 and the strength of the cam lobe 3 can be increased. can get.
かかる中空孔３０と突出部３２の形状について
は粉末成形時の金型が加工し易く、かつ損傷が少
ない上に成形に伴う型くずれの危険性が少ない理
由によつて真円であることが最も好ましい。さら
に金型加工性と均一な粉末密度を得るためには簡
素な形状のものが好ましいが、これらの条件を備
えたカムロブが本考案によつて提供される。 The shape of the hollow hole 30 and the protruding portion 32 is most preferably a perfect circle because the mold is easy to process during powder molding, there is little damage, and there is less risk of deformation during molding. . Furthermore, in order to obtain mold processability and uniform powder density, a simple shape is preferable, and the present invention provides a cam lobe that satisfies these conditions.
即ち突起３２にはステム１に対して偏心した真
円中空孔３０を設け、突出部３２の外周をステム
１と同心の真円とすることによつて突出部３２及
び中空孔３０がカムロブ３とステム１とのクラン
ク機構をなしてカムロブ３に加わるねじれ力をす
べてステム１へ伝えることが可能となる。しかも
突出部３２はステム１の鋳包み突起１２と中空孔
３０側の湯通路１３により全体的に鋳包まれてい
るため、突出部３２の局所的部分に負荷がかかる
ことがなく突出部３２に過負荷による割れの生じ
る可能性がない。 That is, the projection 32 is provided with a perfectly circular hollow hole 30 eccentric to the stem 1, and by making the outer periphery of the projection 32 a perfect circle concentric with the stem 1, the projection 32 and the hollow hole 30 can be connected to the cam lobe 3. By forming a crank mechanism with the stem 1, it becomes possible to transmit all the torsional force applied to the cam lobe 3 to the stem 1. Moreover, since the protruding part 32 is entirely encased by the cast-in protrusion 12 of the stem 1 and the hot water passage 13 on the hollow hole 30 side, no load is applied to a local part of the protruding part 32, and the protruding part 32 is There is no possibility of cracking due to overload.
このカムロブ３の製造は第４図に示す如き粉末
成形方法によつてなされることが好ましい。 Preferably, the cam lobe 3 is manufactured by a powder molding method as shown in FIG.
即ち第４図イに示す如く第二下パンチＤを固定
し、ダイＢ、第一下パンチＣ、コアロツドＦを上
げ粉末Ｊを充填する。次いで第４図ロに示す如く
ダイＢ、コアロツドＦを上げ粉末Ｋを充填する。
粉末Ｊは突出部を、粉末Ｋはカムロブ本体を形成
する部分となる。次いで第４図ハに示す如く第１
上パンチＧと第１下パンチＣを下げて粉末Ｋの上
下に粉末Ｊが形成される如くする。この時に粉末
Ｋは実質的に全く圧縮されていない。次いで第
一、第二上パンチＧ，Ｈを下げると共にダイＢ、
コアロツドＦを第一上パンチＧの約２分の１下
げ、又第一下パンチを第４図ハの粉末Ｊ高さの約
２分の１下げて粉末圧縮を完了させる。この順序
としてはまず第一第二上パンチＧ，Ｈ、ダイＢ、
コアロツドＦ、第一下パンチＣを粉末Ｊの２分の
１だけ下降し粉末Ｊの下パンチ側の圧粉を完了
し、次いで第一下パンチＣを固定した状態でダイ
Ｂ、コアロツド、第一第二上パンチを下げて粉末
Ｊ，Ｋの下パンチ側の圧粉を完了し、最後にダ
イ、コアロツドも固定し第一第二上パンチＧ，Ｈ
を降下し上パンチ側の粉末Ｊ，Ｋの圧粉を完了さ
せて全体として均一な密度の粉末圧粉成形が完了
されることが望ましい。次に第一第二上パンチを
上昇し、第４図ホに示す如くダイＢを下げ、第二
下パンチＤを上げて圧粉体Ｌを取り出す。この時
スプリングバツク効果により圧粉体Ｌに割れが生
じないようコアロツドＦは圧粉体と同じに移動さ
れ、第４図ホの状態となつてから下げられること
が好ましい。 That is, as shown in FIG. 4A, the second lower punch D is fixed, the die B, the first lower punch C, and the core rod F are raised to fill the powder J. Next, as shown in FIG. 4B, die B and core rod F are raised and powder K is filled.
Powder J forms the protrusion, and powder K forms the cam lobe body. Next, as shown in Figure 4C, the first
The upper punch G and the first lower punch C are lowered so that the powder J is formed above and below the powder K. At this time, the powder K is substantially not compressed at all. Next, while lowering the first and second upper punches G and H, the die B,
The core rod F is lowered by about half the height of the first upper punch G, and the first lower punch is lowered by about half the height of the powder J in FIG. 4C to complete powder compression. In this order, first, the first and second upper punches G, H, die B,
The core rod F and the first lower punch C are lowered by half of the powder J to complete the powder compaction on the lower punch side of the powder J. Then, with the first lower punch C fixed, the die B, the core rod, and the first lower punch C are lowered. Lower the second upper punch to complete the powder compaction on the lower punch side of powders J and K, and finally fix the die and core rod as well as the first and second upper punches G and H.
Desirably, the powders J and K on the upper punch side are completely compacted to complete powder compaction with uniform density as a whole. Next, the first and second upper punches are raised, the die B is lowered as shown in FIG. 4E, and the second lower punch D is raised to take out the green compact L. At this time, it is preferable that the core rod F is moved in the same direction as the powder compact so that the powder compact L is not cracked due to the spring back effect, and is lowered after reaching the state shown in FIG. 4E.
尚第一第二上パンチは第二上パンチのストロー
クを大きくし、かつ位相差なく作動されることに
よつて第４図の製造方法は達成される。 The manufacturing method shown in FIG. 4 is achieved by increasing the stroke of the first and second upper punches and operating them without phase difference.
この本考案カムシヤフトのカムロブ製造方法実
施例においても明らかな如く、本考案カムシヤフ
トのカムロブは特殊な形状の金型、装置を用いず
とも容易に生産することが可能であり、かつ均一
な粉末密度の圧粉体から製造されることにより焼
結後の形状変形が少ないため焼結後のカムロブは
機械加工なしに鋳包むことが可能であつて生産性
に著しく優れる。 As is clear from this embodiment of the cam lobe manufacturing method for the camshaft of the present invention, the cam lobe of the camshaft of the present invention can be easily produced without using a specially shaped mold or equipment, and can have a uniform powder density. Since the cam lobe is manufactured from a compacted powder, there is little deformation of the shape after sintering, so the cam lobe after sintering can be cast in without machining, resulting in extremely high productivity.
以上記した如く本考案カムシヤフトにあつては
突出部と中空孔を有するカムロブをステムを形成
する金属溶湯により鋳包むことによつて、カムロ
ブ自体の強度、鋳包み結合強度、ステム強度が得
られるばかりでなく、カムロブに加工の必要がな
くかつ鋳包みによるのみでカムシヤフトが形成さ
れるなど生産性にも優れるものである。 As mentioned above, in the case of the camshaft of the present invention, the strength of the cam lobe itself, the strength of the cast-in joint, and the strength of the stem can be obtained by casting the cam lobe having the protrusion and the hollow hole with the molten metal that forms the stem. In addition, there is no need to process the cam lobe, and the camshaft is formed only by casting, resulting in excellent productivity.
尚本考案にあつては最もねじりや曲げの加わる
カムロブ部に比較し、回転、曲げ力の小さいジヤ
ーナル４、ギア５について第１図に示す如く、鋳
包み用溝４１や孔５２を設けることで充分に強度
が得られるものであるが、特別にジヤーナル４や
ギア５に鋳包み強度を要するものでは本考案カム
ロブと同様に軸方向の突出部を設けることが望ま
しい。この場合にもジヤーナル、ギアは特別の耐
摩耗性が要求されないことより、通常は鋼又は銅
系合金が用いられるため第５図に示す如くジヤー
ナル４の軸方向突出部４２はジヤーナル４に曲げ
加工されて形成される。 In the present invention, as shown in FIG. 1, casting grooves 41 and holes 52 are provided for the journal 4 and gear 5, which have smaller rotational and bending forces than the cam lobe part, which is subjected to the most torsion and bending. Although sufficient strength can be obtained, if the journal 4 or the gear 5 require cast-in strength, it is desirable to provide an axial protrusion like the cam lobe of the present invention. In this case as well, since the journals and gears do not require special wear resistance, steel or copper-based alloys are usually used, so the axial protrusion 42 of the journal 4 is bent into the journal 4 as shown in FIG. and formed.
さらに本考案カムシヤフトのカムロブは第２図
実施例に限定されるものでなく、突出部３２によ
つて鋳包み強度を得るために例えば第６図に示す
如く、中空孔３０をだ円とし、突出部３２外周を
真円としたものでも本考案の効果は充分に達成さ
れる。さらに第４図に示す第二上パンチＪ、第二
下パンチＤを斜円筒形状とし第７図に示す如く突
出部３２の端面が半径方向に傾斜する如く形成し
たことによつても本考案の効果は充分に達成され
る。この第７図実施例の場合は突出部３２の外周
と中空孔３０とが同心円であつてもカムロブ３と
ステム１とは充分に回転伝達されうる。 Furthermore, the cam lobe of the camshaft of the present invention is not limited to the embodiment shown in FIG. Even if the outer periphery of the portion 32 is a perfect circle, the effects of the present invention can be sufficiently achieved. Furthermore, the present invention is also achieved by forming the second upper punch J and the second lower punch D shown in FIG. The effect is fully achieved. In the case of the embodiment shown in FIG. 7, even if the outer periphery of the protruding portion 32 and the hollow hole 30 are concentric, rotation can be sufficiently transmitted between the cam lobe 3 and the stem 1.
この実施例によつても明らかな如く本考案にお
いてはカムロブ３に突出部３２を設けたことによ
つてステム１の鋳包み突起１２と中空孔３０側の
湯通路１３とで突出部３２が完全に鋳包まれるこ
とが主旨とするところであり回転伝達用の回り止
め手段は第２、第６、第７図以外の手段、例えば
軸方向の溝や突起、あるいは突出部３２の円周に
沿つた複数の切り欠きを設けるものでもかまわな
いが、粉末成形上及び焼結合金強度に影響する如
き大きな溝や突起や切り欠きを設けることは好ま
しくない。 As is clear from this embodiment, in the present invention, by providing the protrusion 32 on the cam lobe 3, the protrusion 32 is completely connected to the cast-in protrusion 12 of the stem 1 and the hot water passage 13 on the hollow hole 30 side. The main idea is that the anti-rotation means for transmitting rotation may be a means other than those shown in FIGS. Although a plurality of notches may be provided, it is not preferable to provide large grooves, protrusions, or notches that would affect powder compaction and the strength of the sintered alloy.
さらに本考案にあつてステムを形成する金属溶
湯としては軽合金であることが軽量化の目的上必
要であることはいうまでもないが、Al又はAl合
金、より具体的には亜共晶又は過共晶のAl−Si合
金が強度及び熱膨張率、耐摩耗性上好ましく、鋳
包みにはかかるAl−Si合金ダイカスト手法がとら
れる。 Furthermore, in the present invention, it goes without saying that the molten metal forming the stem must be a light alloy for the purpose of weight reduction, but Al or Al alloy, more specifically hypoeutectic or A hypereutectic Al-Si alloy is preferable in terms of strength, coefficient of thermal expansion, and wear resistance, and such an Al-Si alloy die-casting method is used for casting.
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
拡大図。第４図イ〜ホ：本考案の製造を説明する
実施例断面図。第５図〜第７図：本考案カムシヤ
フト他の実施例断面図。
付号の説明、１：ステム、３：カムロブ、３
０：中空孔、３２：突出部、１２：鋳包み突起、
１３：湯通路、４：ジヤーナル、５：ギア、７：
中空パイプ。
FIG. 1: A 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 view of the main parts of Figure 1. FIGS. 4A to 4E are cross-sectional views of an embodiment for explaining the manufacturing of the present invention. FIGS. 5 to 7: Cross-sectional views of other embodiments of the camshaft of the present invention. Explanation of numbers, 1: stem, 3: cam lob, 3
0: Hollow hole, 32: Projection, 12: Cast-in projection,
13: Hot water passage, 4: Journal, 5: Gear, 7:
hollow pipe.
Claims (1)
金属溶湯によつて鋳包まれてなるカムシヤフト
において、前記焼結合金製カムロブ３に軸方向
に貫通する中空孔３０を設け、該中空孔３０の
周囲には焼結合金製カムロブ３の軸方向幅より
も軸方向に突出する突出部３２を設けたことを
特徴とするカムシヤフト。 (2) 前記中空孔３０が真円であり、前記突出部３
２の内周側と外周側が中心を偏心させた円形状
である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) 前記中空孔３０が非真円であり、前記突出部
３２の外周が真円である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。 (4) 前記ステム１を形成する金属がAl又はAl合
金である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 lobe 3 is encapsulated by molten metal forming the stem 1, a hollow space axially penetrates the sintered metal cam lobe 3. A camshaft characterized in that a hole 30 is provided, and a protrusion 32 is provided around the hollow hole 30 to protrude in the axial direction beyond the axial width of the sintered metal cam lobe 3. (2) The hollow hole 30 is a perfect circle, and the protrusion 3
The camshaft according to claim 1, wherein the inner circumferential side and the outer circumferential side of the camshaft have a circular shape with an eccentric center. (3) The camshaft according to claim 1, wherein the hollow hole 30 is a non-perfect circle, and the outer periphery of the protrusion 32 is a perfect circle. (4) The camshaft according to claim 1, wherein the metal forming the stem 1 is Al or an Al alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13715581U JPS5842308U (en) | 1981-09-17 | 1981-09-17 | camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13715581U JPS5842308U (en) | 1981-09-17 | 1981-09-17 | camshaft |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5842308U JPS5842308U (en) | 1983-03-22 |
| JPS6246803Y2 true JPS6246803Y2 (en) | 1987-12-21 |
Family
ID=29930448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13715581U Granted JPS5842308U (en) | 1981-09-17 | 1981-09-17 | camshaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5842308U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015160439A (en) * | 2014-02-26 | 2015-09-07 | 株式会社タチエス | Sheet lifter for vehicle sheet and sheet lifter molding method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6287017U (en) * | 1985-11-18 | 1987-06-03 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54102209A (en) * | 1978-01-31 | 1979-08-11 | Toyota Motor Corp | Joining method for shaft member with its fitting member |
| JPS5578115A (en) * | 1978-12-08 | 1980-06-12 | Nissan Motor Co Ltd | Cam shaft for internal combustion engine |
-
1981
- 1981-09-17 JP JP13715581U patent/JPS5842308U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54102209A (en) * | 1978-01-31 | 1979-08-11 | Toyota Motor Corp | Joining method for shaft member with its fitting member |
| JPS5578115A (en) * | 1978-12-08 | 1980-06-12 | Nissan Motor Co Ltd | Cam shaft for internal combustion engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015160439A (en) * | 2014-02-26 | 2015-09-07 | 株式会社タチエス | Sheet lifter for vehicle sheet and sheet lifter molding method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5842308U (en) | 1983-03-22 |
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